Table of contents

Preface

This proceeding includes original and peer-reviewed research papers from the 2^nd International Conference on Frontiers of Materials Synthesis and Processing (FMSP 2018: http://www.icfmsp.org/), which was held from 10 to 11 November 2018, in Sanya City, China

FMSP 2018 aims at creating a meeting point for researchers and practitioners from both China and abroad to exchange ideas in the domain of materials synthesis and processing and related topics with their prospective applications in the various interdisciplinary domains of engineering, including not only technological issues but also social issues.

FMSP 2018 received 816 manuscripts, and 170 submissions had been accepted by our reviewers. Articles submitted to the conference should report original, previously unpublished research results, experimental or theoretical and must not be under consideration for publication elsewhere. We firmly believe that ethical conduct is the most essential virtue of any academic. Hence any act of plagiarism is a totally unacceptable academic misconduct and cannot be tolerated. The committees of FMSP 2018 invested great efforts in reviewing the papers submitted to the conference and organizing the sessions to enable the participants to gain maximum benefit.

Hopefully, all participants and other interested readers will benefit scientifically from the proceedings and also find it stimulating in the process.

With our warmest regards,

Lin Liu

Conference Organizing Chair

Wuhan, China

List of Conference Chairmen, Scientific Committee and Organizing Committee are available in this PDF.

All papers published in this volume of IOP Conference Series: Materials Science and Engineering have been peer reviewed through processes administered by the proceedings Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.

Laser shock peening is a new and high technology with application value and development prospect. It can effectively improve the fatigue resistance, wear resistance and corrosion resistance of metal materials. In this paper, two-phase titanium alloy TC17, which is widely used in aerospace field, is studied by finite element method. The effects of different laser shock paths on the deformation and residual stress distribution of materials are studied. The results show that the large-area complex path strategy laser shock peening has a certain influence on the deformation and residual stress of TC17. Single-sided, double-sided simultaneous and double-sided non-simultaneous laser shock peening have a great influence on the residual stress size and distribution. Reciprocating path laser shock peening provides less distortion and higher residual stress than a zigzag path.

Based on continuous adjustment of the underground inclination correction force in a pulse width modulation AADDS (Automaic Anti-Deviation Drilling System) automatic vertical drilling tool to address problems such as pulse width modulation induced significant fluctuation of the inclination correction force and instable relative orientation of a well's inclination, the optimization of the continuous control of the underground inclination correction force of this drilling tool is investigated. Two-position two-way electromagnetic valves in a hydraulic control system undergo multiple on/off controls (i.e., multi-pulse width modulation) in a drill rod rotational cycle T (i.e., a modulation cycle) without changing the existing structure, components and parameters of the drilling tool. The system inclination correction cylinder discharges the oil volume obtained in a cycle T multiple time instead of once. Additionally, a spring energy accumulator is added to leverage automatic conversion between hydraulic energy and elastic potential energy to effectively improve the stability of the inclination correction cylinder pressure and inclination correction force. Multi-pulse width modulation parameters are obtained via a mathematical model of a hydraulic control system. When the drill rod rotating speed is 65 r/min and its cycle is 0.923 s, the inclination correction hydraulic control system test shows that the fluctuation amplitude of the inclination correction cylinder modulation pressure via three-pulse width modulation with a spring energy accumulator is only 30% of the value of that via a single pulse width modulation.

The aging mechanism of polymer materials such as cross-linked polyethylene (XLPE) has been paid close attention. This paper built a temperature-frequency heat aging platform, which is compared with constant temperature heat aging. The acceleration efficiency of XLPE frequency change heat aging and constant temperature heat aging was compared by Fourier transform infrared spectroscopy. Combined with laser induced breakdown spectroscopy (LIBS) and gas chromatography, the dynamic characteristic of XLPE aging process was explored and the thermal aging mechanism of XLPE and other polymer materials was revealed. It found that the aging effect of frequency-induced heat aging on XLPE was more serious, and the artificial accelerated aging time can be shortened by this method. The content of C, H and O elements increased with the increase of aging time, showing three processes of gradual-increasing-smoothing, corresponding to the three aging stages of the material. The results of gas chromatography showed that XLPE mainly released isobutylene gas in the early stage of aging, and the content of oxygen-containing organic compounds released during the middle and late aging period increased and the isobutylene content decreased.

The load-carrying structure of the engine package has a form of frame. The traditional 3D solid finite element method can be used for strength analysis. The beam element method can also be used for calculation and analysis according to its structural characteristics. The two methods are used to calculate and compare, the advantages and disadvantages of the two methods are analysed, and some suggestions on the application of beam element method are put forward.

Strip wrinkling is a kind of recurrent defect in metal production, which leads to the waste of raw material and the decline of production efficiency. The way to reduce loss is to detect this kind of defects as soon as possible. The computer vision algorithms are often used in this kind of situations, but the specific challenge we have to face in this problem is that the steel band is reflective to flash light. This causes the unevenness of exposure in the images we analyze. In order to solve this problem, we propose a method combining homomorphic filtering and region proposal based GBDT algorithm. Our method receives a satisfactory result within both accuracy and detection speed.

In order to study the pore seepage and clogging problems in the permeable concrete, the permeable concrete blockage test device was used to simulate the flow law and distribution of the surface micro-particles through the concrete at the beginning of rainfall. The internal pore structure was reconstructed by CT scanning technique combined with avizo software. The DPM model in CFD was used to simulate the multiphase flow of Kunming surface microparticles through the permeable concrete. The results show: The results obtained by CFD numerical simulation are in good agreement with the experiment. The surface micro-particles with particle size range of 200-500um have a certain degree of blockage to concrete, and still have good water permeability (higher permeability coefficient), and after adding below 200um The particle clogging is more significant, and the permeability coefficient is basically close to 0; but more importantly, it is found by DPM simulation that the small particles of 0-100 um pass through the concrete and the seepage velocity is slow and the partial adhesion to the wall of the tunnel causes the diameter to decrease and affect the seepage.

Hyaluronic acid (HA) hydrogels for injection were fabricated using 1, 4-butanediol diglycidyl ether (BDDE) as a cross-linker. We used hyaluronidase fermented by the marine bacteria Arthrobacter globiformis A152, to comprehensively investigate the effects of BDDE concentration on swelling degree, modification degree, morphology, HA content, anti-enzyme ability, and residual free cross-linker. The results showed that within a certain range, the measured modification degrees of the HA hydrogels and HA contents changed linearly with increased concentration of the cross-linker. However, the change in anti-enzyme ability was not linear, potentially reflecting the influence of the spatial network structure.

This article analyses the impact of lubricants on engine performance, collates the evaluation criteria of existing engine lubricants, and uses Flowmaster to build model and analyse specific vehicle characteristics and evaluation indicators to obtain a model for the relationship between engine oil viscosity and oil consumption of oil pump. For the R&D goal, this model was used to formulate the lubricant components and prepare them. Vehicle tests show that the consumption of fuel oil for vehicles using research and development engine oil will drop by 12%, and noise will drop by an average of 7dB. The engine oil has the effects of energy saving, noise reduction and emission reduction.

To improve the fire resistance heat insulation performance of fireproof glass, the effect of fire resistance performance of fireproof glass interlayer rubber was explored by adding borax to the potassium polysilicate-based slurry. Characterization and testing were carried out by preparing a silica sol mixture, and the transmittance, S/B-0.45H and interlayer thermodynamics, fire resistance and expansion ratio were further analysed. The results showed that the addition of borax affected the transmittance of perfusion type fireproof glass. As the borax content increased, the light transmittance of the fireproof glass decreased. The effect of borax on the expansion efficiency of potassium polysilicate was obvious. In summary, Borax can improve the fire resistance of polysilicate type perfusion fireproof glass. As the borax content increases, the fire resistance of the fireproof glass increases.

In this study, the real-time phase measurement of titanium dioxide under different temperature conditions was tested by real-time measurement of high temperature sample stage and Rietveld refinement method. The real-time phase transformation process of titanium dioxide under high temperature conditions was analyzed. The results show that the (101) crystal plane of anatase titanium dioxide is most stable when the amorphous metatitanic acid is transformed into anatase titanium dioxide during the phase transformation of titanium dioxide, and the growth of anatase has a preferred orientation along the c-axis. In the case of anatase-type titanium dioxide to rutile-type titanium dioxide, the (110) crystal plane of rutile-type titanium dioxide is the most stable, but the rutile type has no preferred orientation.

A new type of T section beam is proposed in this paper, which is mainly composed of Fiber reinforced polymers (FRP) shell and light wood core. The wood core composite T section beams has the following advantages:the integration of the vacuum infusion technology, can avoid the problem of interface slip of steel-concrete beams in the actual process, and between with the traditional composite beam interface with shear stud connections, few construction procedures, relatively simple, but also further improving the interface properties of T section beams. Through four point bending test, the mechanical properties, failure mode, flexural capacity, stiffness and ductility of T section beam with wood core composite were obtained. The test results show that the T-400-60 specimens compared to the specimens of T-400-40 and T-400-20 specimens, the bearing capacity is increased by 34% and 46%, while the stiffness is increased by 40% and 49% respectively, indicating the flange height type of The wood core composite T section beams on the bearing capacity and stiffness of the great influence.

Aiming at the inaccuracy of the magnetic model parameters in the magnetic levitation flywheel's unbalanced vibration control algorithm, this paper proposes an online closed-loop identification method for the magnetic parameters, and feeds the identification results back to the unbalanced vibration control algorithm to obtain higher vibration control precision.

In this paper, two implicit integration algorithms are summarized in computational process, and an explicit numerical algorithm is presented for rate-dependent crystal plasticity in aluminium alloy warm forming, which is based on the forward Euler method. The plastic incompressibility and numerical accuracy are discussed in these algorithms. In this model, the plastic deformation gradient is chosen as controlling variable. The thermal deformation gradient representing the thermal history is introduced, and the plastic dissipation and the different temperature changing rates are considered in finite deformation computation. The expression of temperature dependent resolved stress is deduced form the thermodynamic framework. The mechanical behavior of Al polycrystalline in warm forming is computed and compared with different algorithms.

In order to explore the protective effect of TBHQ (tert-butyl hydroquinone) and BCA (butylated caffeic acid) on tocopherols in oils and fats, various physicochemical indexes of oil samples and changes of tocopherols content during high temperature frying and Rancimat accelerated oxidation were determined. The results showed that the addition of appropriate amount of TBHQ and BCA in oils and fats greatly improved the antioxidant activity, and the added TBHQ and BCA could effectively reduce the loss of tocopherols during the heating process of fats and oils and played a certain role in the protection of tocopherols. In comparison, BCA had a stronger protective effect, especially for the protection of δ-tocopherol.

The present study was carried out to explore the effects of graphene oxide (GO) on callus induction, differentiation, metabolite biosynthesis and antioxidant capacity for tobacco leaves. Results showed that lower concentrations of GO (lower than 600 μg/mL) stimulate the differentiation of tobacco callus into buds and leaves. The content of chlorophyll, soluble sugar, soluble protein, and the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) all increased at lower concentrations of GO. In addition, the length of roots and stems of the regenerated tobacco callus also increased. However, GO induced an increase in malondealdehyde (MDA) content. The experimental results could provide valuable reference for other researches about interactions between carbon-based nanomaterials and plant in callus formation differentiation, metabolite biosynthesis and nanometer pollution.

An unseeded surfactant-free styrene emulsion polymerization is employed to prepare core-crosslinked particles with poly (ethylene oxide) monomethyl ether (mPEO) macro-revesible addition fragmentation chain transfer (RAFT) agent as both the stabilizer and the control agent. The pegylated amphiphilic macro-RAFT agent (mPEO5000-TTC) was synthesized via coupling poly(ethylene oxide) monomethyl ether with a hydrophobic dodecyl trithiocarbonate chain and utilized to form the micelles and control the polymerization and crosslinking of styrene in aqueous solution. The FTIR, 1H NMR, TEM (transmission electron microscopy), dynamic light scattering (DLS) were used to clarify the structure and morphology of nanoparticle. The thermal performance of nanoparticles was measured by TGA (thermogravimetric analysis). The results showed that with the increasing of concentration monomer, the produced size of particles enlarged and then tended to be maximum, while the thermal stability was decreased comparative to the mPEO precursor. The thermal stability of crosslinked particles reflected lower than that of uncrosslinked, which is elucidated with formation and collapse of micelles and micro-phase separation.

Robots have been used widely in every field in nowadays, such as in transport, machining and some other tasks interaction with the human. Impedance control is a useful method to maintain the dynamic relationship between the end-point of the manipulator and the external environment. Considering the uncertainties of the robot parameters and the environment, this paper proposes an adaptive impedance controller, before the controller designed, the dynamic model of the manipulator is established. Then a experimental and simulation study is made to verify the control algorithm, the results show that the adaptive impedance control is valid and easy to implement.

Solid-state ²⁹Si Nuclear Magnetic Resonance (NMR) is commonly used in the detection of silicate molecular structure. However, noise in ²⁹Si NMR spectra (NMRS) disturbs the judgment of characteristic peak, thereby affecting the determination of molecular structure types of silicates. A method of peak fitting based on Singular Spectrum Analysis (SSA) is proposed in this paper accordingly. SSA is adopted to determine the position of characteristic peaks and Gaussian fitting model (GFM) is applied to fit characteristic peak in the method, thereby realizing a quantitative analysis of ²⁹Si NMRS. When SSA is applied, the embedding dimension m determines its accuracy. However, the methods for determining m, such as correlation dimension (GP) and False Nearest Neighbors (FNN), often fail because of the differences in the shape of ²⁹Si NMRS. Therefore, two-step greedy (TSG) is proposed to determine the embedding dimension m in the paper. The accuracy of TSG can be respectively improved by 350.7% and 366.8% compared with GP and FNN according to example verification, and the method can accurately determine the embedding dimension m. The peak fitting method (TSG-SSA-GFM) is formed by combining TSG, SSA, and GFM. The experimental results show that the average error of the characteristic peak location is 0.09ppm, and goodness of fit is 99.75%. The method has good accuracy. Therefore, the study provides an important method for the quantitative analysis of ²⁹Si NMR.

In order to achieve the goal of batting the target quickly and accurately. In this paper, a four-bar linkage mechanism was proposed which used for beating the badminton, and designed a portable badminton robot with omni-directional wheel. Firstly, the 3D model of badminton robot is established. Then the kinematics of batting mechanism is analyzed. Next, the collision of badminton ball is simulated by Adams. Finally, the trajectory simulation for badminton by Particle Swarm Optimization, the parameters of mechanism were optimized.

Single-layer defect-free graphene has excellent shielding performance and can prevent corrosion factors such as oxygen and water molecules from reaching the surface of the metal matrix. Based on the great application potential of graphene in the field of metal corrosion protection, this paper systematically summarizes the graphene film protective coating, graphene/organic protective coating and graphene-conductive polymer/organic protective coating. The existing problems of graphene film and the uniform dispersion of graphene in organic coating are analyzed and introduced in detail, and the future development of graphene-based anti-corrosion coating is prospected.

Recently, sunflower oil has been widely used as encapsulated healing agent for self-healing asphalt. However, few researches have evaluated the healing effect of sunflower oil on aged asphalt binder. As such, this paper investigates the potential healing effect of sunflower oil in bituminous materials. Dynamic shear rheometer (DSR) was employed to evaluate the performance of the asphalt binders. The resultant master curve indicated that by adding 5% sunflower oil, approximately 30% loss of modulus in aged bitumen could be restored. Thus, the test result bear solid testimony that sunflower oil has the potential to fully recover the original rheological properties as well as healing capacity of the asphalt binder.

The purpose is to study the fatigue crack initiation and propagation behavior of aluminum alloy under pre corrosive damage. The high strength aluminum alloy 7B04-T74 with main bearing structure of aircraft was used to prepare single edge notched specimens for pre corrosion and fatigue tests, and the effects of corrosion damage on fatigue crack initiation and propagation are analyzed. It is found that the fatigue crack sprout at the bottom of a single corrosion pit at a low corrosion period, and the length of the crack is equivalent to the width of the corrosion pit, about 0.047mm, and the crack propagates in a straight line. At high corrosion stage, cracks occur at multiple corrosion pits, and the crack propagation paths become tortuous, resulting in glyph cracks.

Both laboratory and oil field tests have documented that enhanced oil recovery can be obtained by performing positioning blockage technology with the lower cost and the higher strength. Modified starch gel (MSG) is the preferred gel for positioning blockage technology considering its resistance abilities on temperature, salty and shear of the graft copolymerization between starch and allyl monomer. Due to the complexity of the reaction which is fractional and its rate bases on velocity, the physicochemical characteristics of MSG are totally different from conventional gel. Based on published data, graft copolymerization reaction rate equation with velocity and concentration is established and physical process for generated copolymer adsorption is characterized, which agreed with documented experimental facts. The dynamic characteristics of injection pressure are obtained by laboratory displacement experiment, which is designed including the early water driving stage, the middle MSG driving stage and the subsequent water driving stage. The quantitative results of characteristic parameters, such as residual resistance coefficient, maximum adsorption amount and viscosity, are achieved by fitting the injection pressure curve of laboratory displacement experiment using numerical simulation technology by CMG software. The viscosity of gel is about three times higher than that of polymer. MSG system had good gelation property which is helpful to enhance the plugging ability.

Basic principles of aluminium alloy conductor low pressure casting are introduced in the paper. Casting die design and casting system are respectively introduced aiming at the low-pressure casting process of aluminium alloy conductor, the influence of cylindrical riser tube and cone riser tube on liquid rising pressure and liquid rising stability in liquid rising process are analysed in details. It is concluded that the liquid rising pressure for liquid rising process is relatively low during selection of cone liquid rising, and liquid rising process of cone riser tube is more stable. Therefore, cone riser tube is more suitable for liquid rising process of aluminium alloy conductor low pressure casting than cylindrical riser tube. Low pressure casting technological parameters of aluminium alloy conductors are summarized through analysis on low pressure casting technology, thereby providing reference for low pressure casting technique of aluminium alloy conductors.

304 stainless steel is a promising material that is extensively used in manufacturing industries. Herein, the influence of the machining parameters electrical discharge machining (EDM) on the material removal rate (MRR) and surface integrity of 304 stainless steel are investigated. The improvement in the MRR with the optimum experimental conditions compared to the initial condition is 64% by the Taguchi methodology. The topography of the section surface produced by EDM with different pulse durations is studied. We founded that the section surface integrity becomes poorer with the increase in the pulse duration.

To improve the power and the safety performance of the HEAT projectile, the charge quality of the melt-cast explosive and the matching relationship between the explosive and the warhead structure were studied. This study breaks through the limitations of the traditional method that based on the ideal composition between solid and liquid phases, and proposes a high-density charging method named "the match relationship between volumes and components". It uses high density spherical RDX as its solid phase and DNAN as liquid phase carrier, with the volume of liquid carrier equal to the packing void of solid phase. Therefore, the internal defect of the charge is reduced, and the explosive energy is increased. Moreover, the structure of warhead of HEAT projectile was optimized according to the characteristics of the melt-cast explosive. In this study, RDX/DNAN instead of the traditional melt-cast explosive (composition B), is used to charge 105mm HEAT Projectile. The results showed that, compared with composition B, the explosive had fewer internal defects and better safety performance, with its density reached 98.3% of the theoretical density; the penetration depth of 105 mm HEAT projectile charged with RDX/DNAN was 11.9% greater than that of composition B; the penetration depth of the optimized HEAT projectile charged with RDX/DNAN was19.2% greater than that of composition B. It can be concluded that, when the HEAT projectile is charged with the melt-cast explosive, not only the charge density is increased with the charge defect decreased, but also the detonation property is improved.

To improve the force control and position control performance of the hydraulic series manipulator, the author presents a double-weighting-factor fuzzy variable impedance control method, in order to have the manipulator end track the expected force along the environmental surface. Based on the dynamic model of the three-degree-of-freedom hydraulic series manipulator, the contact space and free space of the impedance control are analysed. A fuzzy controller is designed while supposing that the environmental information is known, to get B_d and K_d adjusted. Considering the time-varying characteristics of the system, a fuzzy controller with double weighting factors is designed to enhance the self-adjusting capability and the performance of the fuzzy controller. The simulation result shows that the proposed method achieves a good tracking control of force and position when the environmental parameters are time-varying.

A series of turning experiments have been carried out to study the effect of different cutting speed, feed rate,pre-tightening torque and clamping mode on deformation during turning of weak stiffness ring parts. The roundness error of workpiece is measured by using a coordinate measuring instrument, and the roundness error is evaluated by using the least square circle method. The influence of various cutting parameters and clamping mode on the turning deformation of weak stiffness ring parts is analysed. The distribution of residual stress along depth direction was measured by X-ray diffraction method layer by layer. The optimization model of machining process parameters is established. MATLAB is used to solve the optimization model based on the multi-objective optimization function of genetic algorithm, optimizing cutting parameters including clamping force.

Shape-shifting has widespread applications in soft robots and self-assembly structures. To achieve their functionalities, these architectures rely on the spatially bending and buckling to transform the polymer sheets into desired configurations. The goal of this work is to demonstrate that it is possible to tune the shape-shifting behavior through the photo-induced mismatch strain. For the mechanistic understanding, Finite element modeling of thin sheets with different geometry are performed to understand the fundamental mechanics behind the shape transformation behavior. Our experiments with cross-linked polymer samples that change shapes through variation in illumination dose and photo patterns confirm the proposed model predictions. Finally, self-folding structures include flowers, claws, pyramid and saddle are duplicated based on the computational models, indicating the guidelines reported here would be applicable to a diverse array of self-assembly devices.

Based on the level set topological optimization method, a mathematical model for the optimization problem is established to maximize the stiffness of the structure as the objective function, and the structure volume is used as the constraint conditions. The level set function is updated by the reaction diffusion equation; the shape and topology of the structure are optimized together. In order to solve the problem that the low accuracy of solving for level set topology optimization method, a method to improve the accuracy of the level set topology optimization method was proposes by using grid encryption and node encryption method. The validity of this method is verified by the relevant examples.

Under the leadership of the Party Central Committee with General Secretary Xi at its core, the reform and opening up of China continue deepening. The rapid development of the economy attracts worldwide attention. Under the background of the sponge city, this paper is based on China's macro-environmental analysis, takes a plastic inspection well enterprise A with dominant position in the industry as an example, through this company's project research, this paper summarizes briefly related problems of developing plastic inspection wells under the background of the sponge city, thus summarizing the problems of industrialization development of China's new type of plastic inspection wells and proposes relevant suggestions.

Additive Manufacturing (AM) has huge advantages in prototyping and rapid manufacturing, also potentials in integrated design, cost and weight reduction, which are suitable for applications in aircraft. In recent years, aircraft manufactures as well as aviation authorities have made significant progress in Metal Additive Manufacturing components and structures, from materials and processes, to authority approval. Also, new AM technologies are still under rigid development, many of which have even more potentials than current favorite processes like selected laser melting (SLM), wire-arcing additive manufacturing (WAAM). However, as the first and overall requirement for aircraft, security level of AM components are still in question. Stability in mechanical properties, researches in fatigue and defect and issues in AM certification are major concerns for manufactures before AM technologies are really and widely used in aircraft design and manufacturing.

The petroleum proved reserves estimation of companies listed in American stock market must follow the SEC rules. However, there are no specified guidelines on the reserves evaluation besides the issued general regulations. This paper presents the procedures and key concerns for sub-classification of proved reserves in different development stages which are summarized from many practical cases. The important concerns include the well test data, initial well productivity, recoverable volumes assessment, five-year development workload and investment, reservoir connectivity, evaluation unit classification, historical performance identification, infill wells recognition, operating cost split, abandonment cost, etc. This study can provide a meaningful reference for SEC reserves evaluation and assets transaction in petroleum industry.

The double-pass hot compression tests were carried out by MMS-300 thermal simulator. The effects of deformation temperature, deformation amount, strain rate, and austenite grain size on sub-dynamic recrystallization and static recrystallization of GCr15 bearing steel were studied systematically. Based on this, the microstructure controlling of invested steel wire rods during rolling was discussed in this paper, which can provide a basis for the reasonable determination of heating and deformation in the actual production process.

In the background of low oil price, polymer flooding plays a crucial role in offshore development of high-permeability and viscous oil reservoirs. However, during the whole flooding process, profile inversion occurred frequently and could lead to inefficient or low efficient circulation of polymer. Knowing the timing of profile inversion could implement the multi-plug mobility adjustment technology duly, it can effectively expand the sweep volume. At present, the mechanical control factors and influence laws of the profile inversion timing are still unclear, and the suitable mathematical model for judging the timing of profile inversion is also missing. Therefore, on basis of two-layer one dimensional flow model of heterogeneous reservoir, the flow rate distribution model and profile inversion timing judging model are established respectively. These two models are verified by fitting changing parameters of resistance factor using polymer core flooding data, and the influence rules of polymer profile inversion timing are also discussed in this paper. The results show that profile inversion timing is affected by parameters c and d on high permeable layer and parameter b on low permeable layer, which parameters b and d have negative correlation and parameter c has positive correlation with the timing. Based on the established profile inversion timing judgment model and combined with polymer core flooding relative flow ratio data, we can obtain the changing parameter of resistance factor which provide a new quantitative method to evaluate polymer system, predict flooding effect and judge implement time of multi-plug injection technology.

Recently, bacterial cellulose (BC) has become more commonly applied as a new nano-biological material within the food, paper manufacturing and pharmaceutical production industries. However, the current methods of BC production are not ideal because of their low productivity and large number of byproducts. To improve the yield of cellulose production in bacteria, various carbon and nitrogen sources for the fermentation conditions of BC by Bacillus amyloliquefaciens ZF-7 were investigated. The effects of D-glucose, yeast extract and ethanol concentration on BC production by strain ZF-7 were studied by single factor methods. Based on the above results, the effects of D-glucose, yeast extract and ethanol concentration on BC production were investigated by means of a five-level factor central composite design and response surface methodology. D-glucose and yeast extract concentration were found to have a significant linear effect on BC production, and the interaction between D-glucose concentration and yeast extract concentration also had significant influence on BC production. The obtained optimum culture medium contained 56.1 g•L⁻¹ of D-glucose, 9.9 g•L⁻¹ of yeast extract and 17.2 mL•L⁻¹ ethanol. Under these conditions, the BC yield of B. amyloliquefaciens ZF-7 reached 7.88 g/l, which represents a 35.4% increase compared to the initial yield before the optimization.

There have been many researches about improving the properties of materials by adding SiC particle in cast iron in recent years. However, researches on the appearance change, action mechanism, etc. of SiC particle in cast iron have not been deepened. We mainly study the appearance change characteristics of additional SiC particle in cast iron melt and its improvement effect in the paper. The results show that additional SiC particle reacts in cast iron solution, and its size decreases. The phenomenon is summarized as fusion crust characteristic of SiC particle in cast iron. The reaction product of SiC particle fusion crust process can be used as additional nucleation of graphite precipitated core during solidification and the reduced SiC particle after reaction also can be used as additional nucleation of nucleation center for graphite and austenite. Meanwhile, SiC is distributed in a scattered mode, and pin inhibits grain growth in grain boundary.

The effects of climate change, including increasingly severe droughts, shrinking glaciers, changes in the range of plants and animals and rising sea levels, are already being realized, and vary by region. A fragile state is one where the state government is not able to, or chooses not to, provide the basic essentials to its people. This paper establishes the Fragile Evaluation Model based on Fragile State Index (FSI) to determine a country's fragility and measure the impact of climate change. We determine the indicators that affect the national climate and quantify them to establish the Climatic Stress Model. Then, based on this model, we combine the climactic stress index with 12 sub-indicators from FSI to develop the Fragile Evaluation Model. Next, we select Yemen as one of the top 10 most fragile countries from the FSI to determine how climate change increases the country's fragility. The result shows that Yemen suffers a lot from strong wind and desertification which adds to the fragility of country.

In this paper, the heat generation of 110kV cable GIS terminal discovered by infrared thermal imager is briefly described. The causes of heat generation are discussed by means of sheath current detection and circulation calculation, and further analysed by high frequency partial discharge monitoring system, timely handling of equipment hidden dangers, to avoid the occurrence of vicious accidents. Through the analysis and judgment of this accident, the significance of infrared temperature measurement, sheath current detection technology and high frequency partial discharge detection technology for the discovery of cable defects is proved, which provides a basis and reference for future work.

This paper introduces the order and operation performance of 600 MW supercritical W-flame boiler in China and Vietnam. The investigation and survey results about 600 mw supercritical W-flame boiler water wall cracking are indicated. The reason of water wall cracking is analyzed according to the boiler operation and the main reason is the furnace thermal deviation in horizontal direction. The paper indicated the performance and some measures to prevent the water wall cracking from design, installation and commissioning & operation in Vinh Tan 1 Power Company Limited. The fully mixing header is provided on the transitional section of the water wall, which is the most useful method to prevent the water wall cracking.

Aiming at the complex dynamic characteristics of oil and gas suspension cylinders, the simulation model of oil and gas suspension cylinder is established based on AMESim software, and the model is used to simulate the oil and gas suspension cylinder. The main factor in the output characteristics of the cylinder hanging paper focuses on the impact analysis of changes in the characteristics of the nonlinear stiffness characteristics and damping characteristics of the suspension cylinders.

As an effective and economical noise reduction measure, sound barrier has been widely recognized and applied in the research field of high-speed railway noise reduction. The equivalent sound source height corresponding to the two different sound barrier forms of subgrade and bridge are analyzed by the empirical formula calculation method, and the influencing factors of noise reduction effect of high-speed railway are analyzed. Some referential conclusions is obtained.

The top shape of the noise barrier mainly affects the acoustic diffraction, scattering and interference, changes the acoustic transmission path, increases the number and difficulty of diffraction, and thus reduces the field noise. This paper investigates the structural parameters of T-shaped and Y-shaped noise barriers at the top, analyses the noise reduction effect of different structural noise barriers by empirical formula method, and draws a conclusion with universal reference value, which provides a reference for the selection of noise barrier and noise control of high-speed railways in China.

The lumped parameter model of this novel MR Mount was established and nonlinear mathematical state equations of bond graph model for the MR mount is developed. Finally, its dynamical performance is analyzed and predicted. The results show that the dynamic stiffness (400N/mm) in the frequency range 0-20Hz and the dynamic stiffness (500-700n/mm) in the frequency range 0-25Hz are effective for the isolation of road and powertrain source excitation.

Nb-doped Li_xNb_0.005Fe_yPO₄/C cathode material for lithium-ion batteries were prepared by two-fluid spray-drying using FePO₄·2H₂O, LiOH·H₂O, C₆H₁₂O₆(glucose) as raw materials under N₂ atmosphere. The effects of doping Nb⁵⁺ on the structure, morphology and electrochemical performances of LiFePO₄ were investigated. The results show that Li_xNb^0.005Fe_yPO₄/C has Olivine Structure and pure phase. The Li_xNb_0.005Fe_yPO₄/C had an initial discharge specific capacity of 158.5mAh/g at 0.1C and its specific capacities were 109mAh/g at 5C. The initial charge/discharge efficiency reached 93.9%. The discharge specific capacity of the Li_xNb_0.005Fe_yPO₄/C at 253K is 82.2mAh/g. This investigation suggests that the Nb⁵⁺ doped material possess high rate capability and excellent low temperature electrochemical performance.

Establishing a cylinder pressure vessel model is to set a semi-ellipse crack on the inwall and ektexine of the vessel respectively. By changing the included angle values, standing for the inner and exterior crack relative position transformation, to get the inner and exterior crack stress intensity factors changing rules based on the results from finite element software ANSYS Workbench. The result indicates that the stress intensity factor value of inner and exterior cracks is minimum when their circumferential angle is 0° and the stress intensity factor value of inner and exterior cracks is maximum when their circumferential angle is 10°. In total, stress intensity factors of inner crack is more sensitive to the crack relative position transformation and can be easier to be effected by inner and exterior crack interaction.

The variable-lead spiral pair changes the moving speed by the change of lead, which can improve structural stability. The structure has the zero self-locking property due to the change of the lead. Firstly, this paper analyses the whole structure, and then studies the contact problem of the variable-lead spiral pair, including the roller rotation problem and the analysis of friction and wear, finally analyses the structural stress. Through the analysis, the damage type of the structure and the structural stress which meets the allowable stress of the material can be obtained. Then it verifies the structure is reasonable.

In order to improve the electro-actuation, corrosion resistance and antioxidation performance of Ag-IPMC, Polypyrrole modified electrode IPMC (PPy-Ag-IPMC) was prepared by cyclic voltammetry in this paper. The effect of the polymerization segment number on the performance of PPy-Ag-IPMC was studied, the optimal polymerization segment number obtained was 70 segments, the maximum output displacement was 0.41 cm, and the maximum output force was 107.86 mN. In comparison with Ag-IPMC (the maximum output displacement of Ag-IPMC is 0.30±0.05cm and the maximum output force is 90.6±1mN, the maximum output displacement and maximum output force are increased by 36% and 21%, respectively. The corrosion potential of PPy-Ag-IPMC is 0.059V, the corrosion current density is 8.13×10⁻⁷A/cm², and the corrosion rate is 3.276×10⁻³g/m²h, which is much better than the traditional IPMC material (Ag-IPMC) in corrosion resistance capacity.

Accurate calculation of the effective thermal conductivity of composite is of great importance. Based on the heat conduction differential equation, the effective thermal conductivity of spherical particle-laden composite was derived in this paper. To validate the calculation method, comparisons with the Maxwell model, Karayacoubian model, Lewis-Nielsen model, Woodside-Messmer model, and the experimental data were conducted. It was found that the results of the present method are closer to the experimental data. Further validation was conducted with comparison to the finite-element simulations. The effective thermal conductivity of a matrix cube with a spherical particle was simulated and calculated. The results obtained by these two methods were consistent with the relative error within 7%.

The description methods of various tolerance zones and kinematic links based on SDT are discussed. The surfacemodels are applied to describe an assembly, and SDT is used to express the relative position between any two surfaces of anassembly; According to the effect of each functional element on the whole functional requirements of products, the 3-1; dimension-chain is created, and 3-D dimensional and geometrical tolerance analysis for assembly is realized. The engineering example involving 3-D tolerance analysis is given to test the proposed method.

According to the testing methods, filthy degree measurement can be divided into direct detection and indirect detection. This paper reviewed the development history of impurity detection and the current status quo at home and abroad. On the basis of existing research, impurity detection technology application situation, analysis their respective advantages and disadvantages, summarized power system layout is structured and disadvantages. Impurity detection to seek new breakthroughs to integrated a variety of integrated pollution direct detection methods, build a real-time monitoring system, realize the insulator filth adherent state of timely, accurate, in order to reduce the pollution flashover accident and provide support for power grid external insulation protection.

Deep groove ball bearings (DGBB) are widely applied in the supporting structure of a variety of rotating machineries. A high rotating accuracy should be maintained for a more stable rotor system, which requires a carefully designed DGBB. For a designing purpose, dynamic behaviors of the DGBB under different structural parameters need to be investigated. Its dynamic responses are essentially excited by the contact forces induced by external loads. Besides the relative displacement between the inner- and the outer-raceway, and the clearance, ring waviness is the major factor that affects the values of the contact forces and the deformations of different rolling elements. Therefore, the control of ring waviness order and its corresponding amplitude is of great significance for the design of a high-precision DGBB and moreover a rotor system with high rotating accuracy. In this work, the effects of different waviness order and waviness amplitude are investigated to study the dynamic behavior of a DGBB under different waviness parameter.

The difference between the design adaptabilities of shield cutter head system has a strong impact on the tunnelling efficiency. How to study and evaluate its design adaptability is an urgent problem to be solved. In this paper, based on the membership matching degree of adaptability quality of shield cutter head system between the existing design and ideal design, and taking the matching degree as the initial data of the evaluation model, a design adaptability analysis model and evaluation method based on entropy weight improved TOPSIS are proposed. Taking the existing design of shield cutter head system as an example, the adaptability in subway construction are analysed and evaluated. The 9 adaptability indexes are ranked, and the conclusion is drawn that the adaptability of 17 design tasks of the cutter head system are general, which verifies the practicability and credibility of the method.

With the rapid development of the Internet, the combination of Internet technology and robotics has become an important research direction. This paper studies the development status and trends of the domestic and foreign in mechanical arms and remote control and summarizes the problems of the remote control of the robot arm, such as distance, delay, a high degree of freedom and difficulty in controlling. Setting up the remote installation of KUKA mechanical arm, supporting sensors, make up the robot hardware platform, and perform remote operation experiments at any location and at any time through the server/client model. Realizing the trajectory planning on the simulation system, preview the simulation results, confirming the execution effect, and actually running the KUKA manipulator, which has a strong research value and practical value.

In order to solve the problem of transverse crack detection, the method of dual probe cross-weld scanning is proposed. Based on the designed artificial specimen containing two groups of pre-located defects, through the comparison study of CIVA simulation and experimental testing of the specimen, the variation of the gain of different sizes of cracks was obtained with the optimal eccentricity angle of 40∼50 degree. It was proved that this method has high detection sensitivity and high engineering application value.

Aiming at the problem of task assignment of maintenance and repair for long-range rocket launchers, based on systematic review of the basic concepts and basic principles of Stackelberg game, Through the basic assumption's analysis, the Stackelberg model is designed to allocate far-fire tasks. Finally, the results of running MATLAB are calculated. It shows that Stackelberg model of far-fire task allocation can effectively solve the problem of long-range rocket launcher maintenance and guarantee task assignment, which has strong practical significance.

Super-hydrophobic stainless-steel surface (SHSSS) was prepared by simple chemical etching method using ferric chloride ethanol solution and nutmeg acid ethanol solution as etching and modification solution respectively. Characterization analyses, including water contact angle (WCA) determination, Fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and electrochemical workstation were performed on SHSSS.The stainless steel etched with ferric chloride (20 wt%) ethanol solution for 1 h, modified with nutmeg acid, and obtained super-hydrophobic properties (WCA = 151.6 °). Furthermore, the SHSSS has satisfactory chemical stability and corrosion resistance. The surface can maintain super-hydrophobicity within 3.5 wt% NaCl solution of 2 days. The corrosion inhibition efficiency calculated by the fitting parameters of Tafel polarization curve is 81.8%.

Sequence control is of crucial significance in biology. There are great prospects in the application of information storage and transmission by controlling the sequence structure so as to control sequenced compounds. At present, although there are effective synthetic methods for both biosynthesis and chemical synthesis, the severest challenge may be that there is currently no general strategy for synthesizing sequence-controlled polymers.

The context makes pseudo-static test of two square steel tube recycled concrete column - steel beam nodes and two square steel tube recycled concrete column-rectangular steel tube recycled concrete beam nodes, taking axial compression ratio and beam column linear stiffness ratio as experimental parameter, and studies the characteristics and mechanisms of destruction, hysteresis curves, ductility and stiffness degradation and other seismic performance. The results showed that, compared with the steel beam joint, hysteresis curve of rectangular steel tube recycled concrete beam nodes are fuller, its energy dissipation capacity is relatively strong, its displacement ductility factor can reach 4.32, but the beam joint only can reach 3.51, so its ductility and deformation capacity are pretty good, the degree of stiffness degradation is smaller. As we can know, the seismic performance of rectangular steel tube girder recycled concrete beam node is better than that of steel beam node, it is worthy of further promotion applications.

Railway catenary insulators are an important component of electrified railway, and it is becoming increasingly necessary to cleaning. For six degree of freedom manipulator cleaning automatically catenary insulators is analysed with D-H method and researched about kinematic and trajectory planning. Motion and trajectory of cleaning manipulator's mathematical model and theoretical support is established. About the situation of multiple solutions is optimized by energy optimization rule to save energy, and quantitative analysis about Optimized energy consumption. The manipulator's trajectory on Cartesian Space is simulated and analysed. The Basement is built that the solution of positive and inverse kinematics, trajectory optimization, collision-free trajectory and the actual manipulator's working space.

When the wave-piercing catamaran (WPC) sails on the waves, if the wavelength is near to the length of WPC, the pitching amplitude will be large. After years of research, it is found that installing the appendage is a good method of reducing shaking. T-foil is a good choice. In order to study the anti-pitching effect of the T-foil, this paper establishes the motion model of the wave-piercing catamaran and solves the motion equations. The result shows that the amplitude of pitting and heaving can be reduced by 10%.

Here we proposed novel CoMoO₄ nanosheets on nickel foam that used as a superior electrode for supercapacitors, with an excellent pseudocapacitive performance. The CoMoO₄ nanosheets based electrode provide high values of specific capacitance of 1.12 F/cm² corresponding to the current densities of 4 mA/cm². It exhibited good cycling life that the specific capacitance maintained with no decrease during 3000 cycles. Our work can be applied in mass applications of high-capacitance energy-storage supercapacitors.

Nondestructive testing (NDT) of damage in thermal barrier coating (TBC) has received a wide attention for the inspection of aeronautic blade. Use of the ceramic material on top-coat which contains high temperature resistance, corrosion resistance and low thermal conductivity improve the ability to resist high temperature and corrosion of the metallic substrate. The bonding layer, however, is a source of weakness while has the beneficial effect of protecting the base. In this work, various forms of damage in bonding layer between nickel base and ceramic coating are investigated. Different shapes, sizes, positions and quantities of flaws are studied with the simulation of different detrimental reaction occurred in bonding layer. The dispersive characteristics of guided wave propagation in TBC is analyzed using finite element modeling (FEM) to simulate its propagation and scattering. Both time and frequency domain are conducted to study the change in different occasions. The aim is to verify if NDT can detect the damage in TBC with different sensitivity of various acoustic parameters to different types of flaws. Selections of appropriate acoustic parameters for quantitatively nondestructive test and evaluation, as well as location of thermal barrier coating defects are discussed.

The Si-Cr alloyed high-carbon steel was isothermal processed at 200 °C for 8 h after austenizing at 870 °C and 950 °C, respectively, obtaining low temperature bainitic microstructure, which was composed of lath-like bainitic ferrite and film-like retained austenite. The dry sliding wear resistance was measured under the load of 100 N at a rotation rate of 200 r/min. Worn surface morphologies and microstructures of the isothermal transformed samples were analyzed by means of scanning electron microscopy (SEM), optical microscopy (OM), transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The results show that the wear resistance of the Si-Cr alloyed steel with low-temperature bainitic microstructure is better than that of tempered martensitic microstructure.

The influence of cutting parameters (cutting speed v, feed per tooth f_z, cutting depth a_p and cutting width a_e) on cutting force and cutting temperature is analysed by orthogonal test method, and the prediction model of cutting force and cutting temperature is established. The results show that the cutting force decreases with the increase of cutting speed, but the cutting force increases with the increase of feed per tooth and cutting width, and cutting force increases with the increase of cutting depth, and the effect of cutting depth on cutting force is most significant. The cutting temperature increases with the increase of the four cutting parameters, and the effect of cutting width on cutting temperature is most significant. The prediction model of cutting force and cutting temperature can provide reference for choosing cutting parameters in actual machining.

MOFs are a new sort of crystalline materials made from metal units and organic linkers with greatly designable pore structure and specific surface area. Due to unique crystalline porous materials, high surface area and better compatibility, MOFs has been investigated in the many fields of gas separation, drug release and water separation. The MOF/polymer hybrid membranes have also been attractive in the improved permeability and well-maintained solute rejection benefited from the excellent ability of MOFs, especially higher water flux, better antifouling performance and higher protein retention. In general, the MOF/polymer hybrid membranes with unique performances have attracted the most promising attention for addition of membranes.

High temperature phase change thermal energy storage could be widely applied in the fields of solar power systems, industrial waste heat recovery, etc., while the drawback of low thermal conductivity constrains the application of phase change thermal energy storage. The enthalpy-porosity technique was employed to analyze the performance of a thermal energy storage unit with square container and high melting temperature phase change material enhanced by heat pipes and nickel foam. The melting performance of the phase change material with different thermal enhancement methods has been studied. The obtained results reveals that heat pipe is more effective than the nickel foam, and the heat pipe-nickel foam mode could effectively shorten the melting process and decrease the temperature difference within the phase change material in the container. The simulation could provide a significant reference to the phase change energy storage system enhanced by heat pipes.

In this paper, we reveal tunable broadband reflective filtering property in graphene-dielectric multilayers using transfer matrix method and effective medium theory. A dramatic reflectance change from near-zero value to close-to-unit is shown to be achievable with its spectral band widely tunable from 3.5 μm to 21 μm by changing graphene Fermi energy. Our proposed multilayered graphene-dielectric metamaterial has great potential for developing tunable infrared filters and switches.

The concentration of furfural in transformer oil is an important indicator of the degree of aging of insulating paper. By measuring the content of furfural in the transformer oil, it is possible to understand the degree of aging of the insulating paper and estimate the residual life of the transformer. In this paper, we introduce a principle and method for the determination of trace furfural in transformer oil by high performance liquid chromatography. The measured data show that the method is small, simple, and sensitive, which is of great significance for diagnosing the aging of transformer insulation paper.

Titanium based platinum group composite active electrodes were prepared by thermal oxidation decomposition method at high temperature. Effect of temperature on titanium composite active coating electrodes was investigated. Kinetic study of anodic process of active coating was carried out. The influence of composite active film physicochemical properties on electrochemical catalytic activity and enhancement service life was conducted.

Anionic polyacrylamide microspheres P (AM-AMPS) were synthesized by emulsion polymerization with 2-acrylamide-2methylpropanesulfonic acid (AMPS) and acrylamide (AM). The degradation experiments were designed at 80 °C. The degradation products of this microspheres were analyzed by scanning electron microscopy, thermogravimetric analysis, infrared spectrum, dynamic light scattering, pH and viscosity measurement. The results showed that, in the first four hours, radical oxidative degradation rapidly broke the main polymer chain of microspheres and decreased the solution viscosity sharply, while the hydrolysis reaction relatively moved slowly and pH kept steady around 2.75. Four hours later, the radical oxidative degradation approached to termination and the hydrolysis reaction of amide began to raise pH by self-acceleration of amide group in acidic condition. The out-layer polymer branch of microspheres degraded in 4 hours and then the inner main chain began to break, resulting in the following faster size decrease.

MoS₂ microspheres were synthesized by a hydrothermal method using sodium molybdate as the molybdenum source and thiourea as the sulfur source, were used as the counter electrode of dye-sensitized solar cells. This paper discussed the influence of the thiourea concentration on the preparation and photoelectric properties of MoS₂ microspheres. The results show that the crystallinity, microsphere structure, photoelectric conversion efficiency and catalytic activity of MoS₂ reach the best state when the Mo/S molar ratio is 1:4. Therefore, the thiourea concentration has an important effect on the structure, morphology and photoelectric properties of MoS₂. The conclusion will provide the basis for us to improve the electrode material performance of MoS₂ to replace Pt counter electrode.

Aiming at the characteristics of cigarette logistics distribution center, the low degree of automation of the special-shaped cigarette sorting equipment, low work efficiency, which is not easy to implement automatic management, a sorting actuator of pinch-type is designed for special-shaped cigarette. Considering the special attributes of multi-size, multi-shape, and multi-specification of the special-shaped smoke, to improve the efficiency of sorting equipment, the team designed a flexible high-density cache warehouse. a set of appropriate sorting execution strategy is proposed. The design of the mechanical structure is simple, real time control of sorting process. Through the experiment, the design feasibility of the mechanism is verified. It provides a theoretical basis for the design improvement of the follow-up equipment.

A carbon fiber-reinforced plastic (CFRP) laminate modified by lead-zirconate-titanate (PZT) particles was fabricated in this study. The simulation on underwater acoustic radiation of the modified laminate was carried out by fluid-solid coupled finite element method and acoustic direct boundary element method. Furthermore, the underwater acoustic radiation of the composite laminate modified by PZT particle was studied by the underwater experiment performed over a range of frequency (20∼1500Hz) and angle (0∼180 degree). The results show that the maximum underwater radiated sound power of CFRP laminate obviously reduced by the PZT particles interlayer doping method and the radiation peaks moved to high frequency, which was beneficial to attenuate underwater noise caused by CFRP composite structure.

Artifacts, based on large general indexes of spraying robot spraying space is difficult to meet the requirements, in this paper, the large surface, especially for complex shape, high quality demand of film product requirements, design a horizontal moving and lifting machinery, to meet the needs of spraying workpiece for the robot working space; Through Creo software, ANSYS software is analysed to ensure the stability and feasibility of the structure. Integrate the design process and analysis process and shorten the r & d and application cycle; It lays the foundation for the following trajectory planning module.

For forging process in the production of high energy consumption, this paper proposes an energy-saving scheduling model. This article will take the forgings oven minimum hours minimum energy-saving scheduling for the production target of minimizing the idle time are established to aim at oven, for the purpose of energy saving. Using the Hungarian method to hierarchical model, and finally got the forging production of energy-saving of optimal production plan, and uses case to verify the feasibility of scheduling model.

Aiming at the problems that the existing electric tractors have large ground clearance and high center of gravity,and easy rollover during driving, a double wishbone independent suspension is designed for a certain type of electric tractor. The virtual prototype model of the suspension is built by ADAMS software, and the simulation analysis and optimization are carried out to find a set of optimal wheel positioning parameters to ensure that the electric tractors have good steering stability and smooth running, which has a certain guiding effect on actual production.

Aiming at the problem of mechanical vibration measurement in material processing equipment at present, a vibration measurement method using MEMS micro-accelerometer as measuring sensor is proposed. The wireless sensor module with the core of CC2430 device is used to form the sending and receiving node of the signal. ADS8344 chip is used as the data acquisition converter to collect the vibration signals output by MEMS sensor. Collection, storage, control and other functional modules are integrated in the single chip microcomputer. At last, the vibration peak value and frequency of the system are tested, and the feasibility of the system is verified.

Large-scale applications of magnesium oxysulfate (MOS) cement in civil engineering have been restricted by its defects such as low early strength and poor water resistance. In this study, some additives were used to modify MOS cement. The results show that phosphoric acid and citric acid can effectively increase the mechanical strength of MOS cement with the dosage of 0.6% and 0.3% respectively. The addition of fly ash and waste GFRP fiber contribute little for the mechanical strength of MOS cement, but has positive effect on water resistance improvement. Silica fume can significantly improve the mechanical of properties and water resistance of MOS cement as well.

Soluble polyimide was synthesized from 4, 4'-(4, 4'-Isopropylidenediphenyl-1, 1'-diyldioxy) dianiline (BAPP), 4, 4'-Diaminodiphenyl ether (ODA) and 4, 4'-Oxydiphthalic anhydride (ODPA) in a certain proportion. The porous polyimide (PI) membranes were prepared by phase transfer method. The molecular structure, pore size, contact angle and thermal stability were characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), contact angle measuring instrument. The results show that the prepared porous polyimide membranes have three-dimensional network of microporous structure with a surface pore diameter of 0.5-1 μm; The porosity increases with the increasing quality ratio of anhydrous ethanol and acetone in the solution, which reaches more than twice of the conventional Celgard 2400 membrane;The contact angles of the porous polyimide membranes are smaller than that of separator of the Celgard 2400 membrane and showing better lyophilicity, which were all take distilled water as the test solution. The porous polyimide membranes have better heat resistance, and the size does not change significantly after heat treatment at a maximum of 180°C for 0.5 h.

Super ferrite stainless steel as a new material in heat transfer equipment has applied widely in foreign coastal power plants because of its high strength, low coefficient of thermal expansion, and corrosion resistance. In this paper, stainless steel materials with S44660 super ferrite and 316L were selected as research objects. The corrosion and scaling of S44660 and 316L in model geothermal water (environmental conditions of geothermal water in the central plain of China) were studied by the electrochemical tests, weight loss method. The electrochemical results show that the corrosion resistance of S44660 is better than that of 316L in geothermal water. Weight loss tests and microscopic analysis indicate that S44660 is easier to form scale than 316L.

The ceria partially stabilized zirconia (Ce-PSZ) ceramics with 7wt%, 10wt%, and 13wt% CeO₂ stabilizing agent were prepared under industrial conditions. The relationship between the content of CeO₂ and the physics property, mineral composition, and microstructure of zirconia metering nozzles was investigated through X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results show that with the increasing content of CeO₂, the apparent porosity of samples increases, the bulk density and compressive strength decreases, the thermal shock resistance first increases and then decreases; meanwhile, m-ZrO₂ is transformed into c-ZrO₂ and the degree of stability is improved. However, excess c-ZrO₂ will lead to abnormal growth of zirconia particles, which lead to reduction of compressive strength and apparent porosity increasing. Thermal shock resistance of Ce-PSZ is sensitive to the addition of CeO₂. The best thermal shock resistance can be obtained with the addition of 10wt% CeO₂ stabilizing agent, which is 1.5 times that of the sample with 7wt% CeO₂ and 3 times that of the sample with 13wt% CeO₂.

The composite properties of polymer composites for municipal sewer pipes are studied. Firstly, the research background is introduced, and then the definition and classification of polymer grouting materials are expounded. The environmental stability and safety properties of polymer composites are analyzed, and the conclusions are drawn as follows: first, polymer composites are safe and non-toxic, and even if they are buried underground for a long time, they will not be harmful to the environment because of the long-term immersion of groundwater and the release of toxic and harmful substances; second, polymer composites will not lose their stability and thus affects their effectiveness due to the chemical corrosion of normal ground environment.

To analyse the huge production data scientifically, the records of enterprises were used. Principal component analysis techniques and quantitative corresponding factor analysis techniques in big data technology were applied. The primary and secondary factors affecting the design performance of PTC cable materials and the influence laws were found. Through analysis, the best process recipe conditions in the existing data were obtained. The results showed that the optimization of the PTC cable material formulation process effectively guided industrial production and met different practical needs. In summary, multi-factor and multi-level visual design and analysis methods, artificial neural network models and big data technology have good qualitative and quantitative analysis functions. A complex process optimization problem with four influencing factors and three indicators is solved.

In order to effectively monitor the leakage current on the surface of organic materials, based on the existing research status, the relevant research results at home and abroad are analysed profoundly, and a more advanced system is designed to measure and monitor the leakage current on the surface of organic materials. The hardware circuit (main control circuit, differential amplifier circuit, filter circuit, power supply circuit and communication interface circuit) and software system (main program, data acquisition subroutine, data processing subroutine, communication subroutine, etc.) of the monitoring system are designed, respectively. Generally speaking, some researches are carried out on the carbonization and leakage current measurement of organic materials, and it also lays a theoretical foundation for the follow-up related research.

The grounding current increases and the outer sheath heats up seriously, which will greatly reduce the operating heat capacity of the cable and affect the stable operation of the cable. Therefore, detecting the grounding current of the cable accessory is of great significance for monitoring the operation of the cable. In order to improve the operational monitoring level, the ground loop online monitoring system began to be gradually applied in the power system. In this paper, based on the operating environment of XLPE high-voltage cable, the structure design of the on-line monitoring system of grounding circulation is analysed. The examples of online monitoring system are given. The advantages and disadvantages of the monitoring system are discussed in combination with the operating experience.

The Au₄₀Cu₃₀Pd₁₀Si₂₀ amorphous alloy samples with size of 5mm×0.02mm were prepared by melt-spinning method. The thermal analysis results show that the glass transition temperature T_g, the initial crystallization temperature T_x and the supercooled liquid region ΔT of Au₄₀Cu₃₀Pd₁₀Si₂₀ amorphous alloy are 404K, 440K and 36K, respectively, and the calculated glass transition temperature T_rg is 0.617, the parameter γ is 0.415. Compared with other Au-based amorphous alloys, the Au₄₀Cu₃₀Pd₁₀Si₂₀ alloy has good glass-forming ability (GFA), better thermal stability and good ductility.

Similar rock specimens without microcapsules were prepared on the basis of similarity principle, and uniaxial compression tests were carried out to obtain the general law of rock fracture propagation. Microcapsules were mixed into rock specimens in three ways. The first way is uniform mixing. The second method is to add microcapsules at different levels. The third way is to add microcapsules along the crack propagation angle. The uniaxial preloading tests were carried out to obtain the compressive strength of the microcapsules. After the curing of 7d and 14d, three specimens were subjected to compressive test again and the strength recovery rate was calculated. Draw the following conclusions: after pre-compression repair, the compressive strength increases, indicating that microcapsules play a repair role; adding microcapsules along the average angle of crack propagation is the best way to repair the crack; the stress-strain curves show good elastic-plastic, the pressure relief curve is stable, and the residual strength is stable.

Ethylene vinyl acetate copolymer (EVM)/aluminium trihydrate (ATH) composites were prepared. Vinyl-trimethoxysilane (VTMO), triethoxyvinylsilane (VTEO), ethyltrimethoxysilane (ETMO), amino-propyl-trimethoxysilane (AMMO) four kinds of silanes were used in this research. The effects of silane amount and different kinds of silane on the dispersion and adhesion of the ATH in EVM composites were characterized through RPA, electron microscopy, bound rubber. It was found that the addition of VTMO/AMMO/VTEO led to a dramatic increase in Payne effect and tensile property of the composites. Filler dispersion increased with silane adding, and the interaction of ATH and EVM was found in silane treated composites, in which silane had effective functional groups.

To make the mechanical properties of the transmission pipeline material work effectively, the finite element analysis method was adopted. According to the national seismic code, GIL modal analysis and response spectrum analysis were carried out to obtain the mechanical vibration characteristics of GIL. The direction of GIL laying was inconsistent with the direction of seismic wave propagation. The results showed that the seismic excitation direction affected the GIL seismic response, and the insulator and conductor were weak parts of the GIL seismic response. In summary, changes in structure and material parameters significantly affect the seismic capacity of GIL. Under the premise of satisfying the electrical characteristics, reasonable selection of insulator and conductor parameters is beneficial to improve the overall seismic capacity of the GIL.

To study the crosslink network structure and the correlation with tensile mechanical properties of hydroxyl-terminated polybutadiene (HTPB) binder, tensile test and nuclear magnetic resonance test were introduced, the crosslink data and tensile stress-strain curves were obtained at various temperatures. The results show that the temperature has a significant effect on the crosslink density. When heating the samples from 30°C to 90°C, the crosslink density decreases and the transverse relaxation time increases. From 90°C to 130°C, the crosslink density raises at first and then becomes lower, and the transverse relaxation time keeps increasing. When the temperature rises from 30°C to 90°C, the elastic modulus and tensile strength of the binder are reduced, the elongation at break gets greater, and the tensile strength and the crosslink density has a linear relationship, which can predict the tensile strength of the binder at different crosslink densities.

Raman spectroscopy was performed to analyze the lattice damage and thermal recovery process of SiC single crystals irradiated by 1.25 MeV Si ions with a fluence of 1.0×10¹⁶ cm⁻² at RT, 300°C, and 500°C. The ion irradiation at RT leads to the transformation of SiC from crystalline to amorphous state, which is demonstrated by the appearance of Si-Si, Si-C, and C-C vibration modes. For the irradiation at 300 and 500°C, two of predominant Raman peaks at 1355 and 1578 cm⁻¹ are detected. This reveals that the irradiation at elevated temperatures can cause the formation of graphite clusters. The graphite cluster has a poor thermal stability and is removed after annealing at 400°C. The Raman peak at about 576 cm⁻¹ appears after the annealing at 800°C. It could originate from C_SiV_C defect complex.

In this paper, WC reinforced and non-reinforced iron-based hardfacing alloys were deposited by PTA welding. Influence of WC particles on the hardfacing alloy was revealed by analysing the microstructure, microhardness and wear behavior. The results show that the matrix metals of the two hardfacing alloys are similar in structure. The primary carbides (Fe, Cr)₇C₃ and eutectic carbides are distributed on the cryptocrystalline martensite and residual austenite. The distribution of the large WC particles in the whole hardfacing alloy are relatively uniform, compared with the non-reinforced hardfcing alloy, the WC reinforced hardfacing alloy exhibits higher microhardness and better wear resistance property.

The paper mainly expounds the properties, synthesis, application and development of the nano materials and nano ZrO₂ materials, emphasize to introduce the process of preparing MgO-TiO₂-CeO₂-ZrO₂ by using the hydrothermal synthesis method and start a series of characterization and testing on them such as the thermogravimetric analysis, infrared spectroscopy, ultraviolet spectroscopy, XRD, scanning electron microscopy (SEM), and the testing and characterization data were collected and analyzed. Due to the special structure of zirconia, which at the same time with oxidizing and reducing, so it can be as a catalyst or catalyst carrier, after some particle doped its catalytic performance is more obvious and improve, nano zirconia in the future will be boarded the greater dance, and also with more metal particles doped excellent performance have been excavated the potential of nano zirconia.

This paper uses grapefruit peel as raw material, carbonized at 300°C, 400°C, 500°C, and 600°C, respectively, to prepare biochar at the corresponding temperature, and select the optimal carbonization temperature through adsorption degradation experiments. Then the biomass charcoal prepared at the optimal carbonization temperature was modified by 1 mol/L hydrochloric acid and 2.5 mol/L sodium hydroxide solution, and the modified grapefruit skin biomass was mainly studied by hydrochloric acid modified biomass charcoal. The optimum adsorption conditions of carbon for organic wastewater were studied. The methylene blue and phenol-containing wastewater were selected respectively. The adsorption and adsorption laws of grapefruit skin biochar on two organic wastewaters were tested.

Pressure distribution of the human-machine interface is a key factor which affects the comfort. Because every part of the human body has different tolerance to pressure, high or low pressure will make the driver feel uncomfortable. Through the virtual simulation method combining 3D modeling and finite element analysis, the human body and seat finite element model is established to simulate the interaction of the contact interface, the human-seat coupling model was constructed and finally imported into ANSYS for finite element analysis and compared with the actual measured pressure distribution. The pressure distribution obtained by this method was proved to be feasible for evaluating driver comfort. When apply on seat back comfort study, the changes in the pressure distribution under various conditions can be observed by changing parameters such as seat inclination. The model can be used as a scientific basis for seat comfort assessment and optimization, and the researchers can understand the pressure on the driver's various parts to guide the seat comfort design.

More and more companies have shifted focus from simple product competition to the competition of 'manufacturing plus service' value chain at present. MRO (Maintenance, Repair, Overhaul/Operation), a general term for all kinds of manufacturing service activities, such as repair, maintenance, overhaul and operation, which is an important part of the whole life-cycle of the equipment. In order to improve the MTBF of NC equipment,we eliminate the information island maintenance services, and establish the NC equipment MRO service model for the full life-cycle oriented NC equipment maintenance system.

Modular technology of mechanical equipment is an efficient product manufacturing strategy; it could meet the diversified and personalized needs of users. At the same time, it could shorten the manufacturing cycle and reduce the production cost, so as to enhance the competitiveness of products. Based on the concept and method of modular manufacturing, the general steps of modular manufacturing of mechanical products was pointed out, and the modular division and manufacturing strategy aiming at realizing special functions were expounded when the tea garden management machine was taken as an example. By changing general and alternative modules, the transformation of different functions of the tea garden management machine is realized. It achieved the purpose of one machine with multiple uses, and has certain reference significance for the modular manufacturing of small agricultural machinery.

Using high bonding energy, low surface energy of polymer-based insulation materials, blending modification of nanoparticles, the composite material surface and internal building "micro-nano" super hydrophobic structure, realization of polymer-based the preparation of nano super hydrophobic insulation materials, to make it break the super hydrophobic material only on the surface to construct "micro-" hydrophobic structure, improve its wearability and applicability, realize "existence is effective" super hydrophobic properties. The surface charge characteristic test and internal mechanism of polymer-based nano-composite super-hydrophobic insulating materials were studied. The conductance transformation mechanism of nano-composite super-hydrophobic insulating materials under different temperature and high field intensity curves was used. Combined with the study of surface charge, the effects of electric field intensity, electrode material, temperature, humidity and doped particles on surface charge of nano-composite super-hydrophobic insulating materials are analyzed.

The Concept of intelligent manufacturing has brought about the rapid development of intelligent machine tools, and the development of manufacturing industry has been deeply influenced by such functional components as high-speed spindle. High-speed spindle is the important part of machining center. This article expounds the application of high-speed spindle on intelligent high-speed drilling and tapping center from the aspects of main driving mode and structure of high-speed spindle, and verifies the feasibility of application by means of measurement of temperature rise, measurement of vibration and processing effect of parts.

The dynamic problem of belt conveyor is analyzed systematically and the whole dynamic model of belt conveyor is established. This paper studies the solution of the dynamic equation of belt conveyor, develops the intelligent system software of dynamic analysis and simulation of conveyor, and conducts the dynamic simulation of a coal mine belt conveyor system.

In order to explore the mechanism of electromagnetic force restraining the deformation of liquid metal with non-uniform diameter, the coupling simulation of electromagnetic field and flow field was carried out to study the distribution of electromagnetic field and flow field in liquid metal. The simulation results show that the electromagnetic force at the convex position of the liquid metal is the largest, while the electromagnetic force at the concave position is smaller, and the diameter of the liquid metal with non-uniform diameter tends to be the same under the action of the pressure difference of the electromagnetic force.

A large number of vibration data are compared and analyzed in various environmental ground conditions by using the measured data of a large number of vibration measured in the station of the Qingdao Metro and the station West Town, the falling of the objects, the personnel passing through, the knocking on the ground, incorrectly triggering the sensor and the continuous contacting surface of the object. The "vibration decay time" is defined as the time when the maximum value of the wave appears in the vibration velocity diagram until the maximum value of the wave is stabilized to less than 10% of the maximum value. The following conclusion is drawn: if the vibration decay time is lower than 0.1s, it can be judged to be a non-blasting vibration. When the vibration decay time is above 0.1s, the Fourier transform is simplified and its amplitude spectrum is obtained. If the excellent frequency band is 130Hz∼230Hz, it is blasting vibration. If the excellent frequency of vibration is larger than 450Hz, it is a disturbing vibration.

In this study, maize straw was used to prepare formaldehyde-free panels with soy-based adhesives. Influences of adhesive amount, hot-pressing time, temperature and pressure on the internal bonding strength were optimized by applying response surface methodology (RSM). The results showed that based on experimental mathematical model, the optimum hot-pressing conditions were obtained. Adhesive amount was 14%, hot-pressing pressure was 3.0 MPa, hot-pressing temperature was 126 °C, hot-pressing time was 28 s/mm. The actual internal bonding strength was 0.52 MPa while the predicted value was 0.51 MPa, indicating that the experimental mathematical model was accurate and reliable.

In this paper, some selected physical and mechanical properties of Cupressus funebris Endl. wood was tested according to the guidelines of the China National Standards, which includes GB/T 1931-2009, GB/T 1933-2009, GB/T 1941-2009, GB/T 1936.2-2009, GB/T 1936.1-2009, GB/T 1935-2009, GB/T 1939-2009. Moisture content, basic density, end, tangential and radial surface hardness, modulus of elasticity, bending strength, compression strength parallel to grain, radial compression strength perpendicular to grain and tangential compression strength perpendicular to grain are 7.9%, 0.65g/cm³, 5333N, 4178N, 4066N, 8.2Gpa, 89.8Mpa, 45.8Mpa, 9.4MPa and 8.9MPa, respectively.

First, the force model of roll is set up, and the temperature field is analyzed according to the properties of the processed material, which provides data support for the thermomechanical coupling analysis of roll. Then, The effect of the roll temperature field distribution, the equivalent stress distribution and the equivalent plastic strain distribution on the roll is analyzed by the sequential thermo mechanical coupling analysis of the roll. Finally, It provides theoretical support for studying the mechanism of roller damage and prolonging the life of rolls.

In turning, workpiece surface quality is an important evaluation index. In order to study the changing rule of influence of turning parameters on surface quality, the cutting force and surface roughness are taken as references and the orthogonal test method is adopted to conduct data processing and result analysis on the turning test of ultra-high-strength steel A-100.On the other hand, the cutting force of turning is simulated and analyzed through the finite element simulation, and the results are compared with the experimental results to draw a conclusion.Through this test, the optimized parameters can be selected for the researchers and the processing workers to process and test when turning ultra-high-strength steel A-100.The test shows that the cutting depth has a deeper influence on the cutting force than the feed and spindle speed. The surface roughness is affected deeply by the feed quantity, then by the cutting depth and least by the rotating speed.

Explosive welding composites have been widely used in aerospace, petroleum, chemical, military and other fields, because of their characteristics of corrosion resistance, heat resistance and high strength. The theoretical research of metal explosive welded materials was introduced systematically, and the significance and trends of interface research were analyzed in this paper. Finally, the development trend of explosive welding of metal materials is prospected. It is pointed out that the prediction of damage behavior of explosive welding composites in service environment has certain scientific significance and engineering application value.

In modern industrial production, a large number of production scheduling problems exist.We set up the actual integrated scheduling model of production workshop to analyze the actual scheduling problem of the factory.The optimal scheduling situation is obtained through the establishment of the "minimum time cost model" simulation, and the optimal scheduling is solved through the modification of the chaotic genetic algorithm to maximize the efficiency and benefit of production.In addition, the time required to complete the one-cycle process of RGV is solved by simulation and the time points of each step are listed. Finally, the optimal production scheduling scheme is given.

Based on the volume averaging method, the local linearized macroscopic flow equation in porous media with inertia effect is derived, and the solution of Navier-Stokes equation with large Re can be obtained recursively, thus avoiding the problems of high computational cost and poor computational stability caused by solving Navier-Stokes equation directly. An example of a square periodic array model shows that the average velocity direction is not always consistent with the direction of the macroscopic pressure gradient.

In this study, a novel poly (acrylic acid-aniline)-grafted MCC conducting composite were synthesized by a simple two-step method. The radical copolymerization of MCC and AA was based on Electron Beam Irradiation Grafting. The synthesized MCC-AA matrix was further grafted with aniline through oxidative-radical copolymerization using APS in acidic media. The resultant MCC-PANI was characterized using X-ray diffraction, thermo gravimetric analysis, and electrical conductivity. It was found that acrylic acid was successfully grafted onto cellulose, and polyaniline was successfully coupled to modified cellulose. and the thermal stability of modified polyaniline composite cellulose was improved. The electrochemical activity of the composites was the best while the mass ratio of aniline monomer to MCC is 3:1. These novel nanorods are desirable for applications in supercapacitor devices.

The excellent properties and applicability of graphene composite, nylon fiber composite, unsaturated polyester composite, carbon fiber composite and epoxy resin composite in sports equipment are introduced. It is pointed out that while developing competitive sports, we must attach great importance to the development, modification and utilization of new high-tech materials, so as to achieve faster and better development of sports. In the future, sports equipment will develop towards personalized, intelligent and environment-friendly materials.

The stresses and relative stiffness of the head cover bolts in a pump turbine have been calculated using ANSYS. In the numerical model established, the head cover, stay ring and bolts have been included. Results show that the bolts bend due to the preload and the hydraulic pressure acting on the head cover. Consequently, stresses in the mid sections of the bolts are uneven. It is also found that the relative stiffness of the bolts and flange vary with the working condition and preload, which indicates that the whole model including the bolts is a nonlinear system. Therefore, this study concludes that the relative stiffness of the bolts and flange for pump turbines should not be assumed to be a constant value at the design stage.

Since China entered the process of reform and opening-up in the twentieth century, China's economic and technological levels have been developed rapidly, showing a flourishing scene on the whole, which has a great contribution to the development of China's industry and new technology research. Industrial computed tomography (ICT) technology, as a main means of visual inspection of industrial construction or other materials, has become more and more widely used in defect detection of resin-based conformance materials. It can effectively detect the content of impurities in the products, the location of pores, and so on, so as to accurately study the size and location of defects. Upgrading of the entire composite material.

The gallium contained in extracting vanadium tailing slag was 0.014%. It is typical of the rich gallium raw materials. The various methods that it extracted gallium from extracting vanadium tailing slag were compared and discussed. The effective dissociation of gallium from the complex structure of aluminosilicate of gallium is the key of extracting gallium from extracting vanadium tailing slag. And the future development was prospected. The future development direction was high-temperature alkaline roasting-high temperature pressurized alkaline leaching-alkaline extraction (or resin adsorption)-electrolytic extracting gallium.

The AnyCasting software was used to simulate the filling and solidification of the casting technology of boom stand, therefore the type and location of the detect in the casting can be predicted based on the simulated result. According to the detect in the casting, the casting technology can be modified and simulated, then the casting technology can be optimized, and the detect in the casting can be minimized.

The NiCrBSi MMC coatings were formed on the surface steel using laser processing to reinforce the wear resistance of steel substrate. The NiCrBSi MMC layer were composed of the coating zone (CZ) and the bonding zone (BZ). The microstructures and properties of the coatings were investigated. The results showed that the NiCrBSi MMC coatings with no micro-cracks, lamella structures, pores and voids mainly consisted of reticulation structure of Fe-Cr solid solution and blocky structure of Fe-Ni solid solution, which were as solid solution strengthening in CZ. A small quantity of Ni₃Si phases and carbide dispersed in interdendritic structure. Compared with the steel substrate, the wear properties of the NiCrBSi coatings significantly improved due to the high hardness chrome dendritic phase and contain hard particles. Consequently, the weight loss after wear test for the NiCrBSi coatings is much less than that of steel substrae.

Gelatin is a kind of macromolecule hydrophilic colloid which is processed by collagen. It exists widely in nature and belongs to renewable green resources. A new composite material can be obtained by combining gelatin as raw material and other substances. New gelatin composites exhibit superior properties and are widely used in medicine, food, cosmetics and other fields. Based on the structural properties of collagen materials, the preparation of medical gelatin-based composites was studied according to the composite principle and method in materials science. The characteristics of medical gelatin-based composites and their applications in medicine were also described.

QPQ treatment was carried out on the circulation of a certain type of aero-piston engine. Nitrification treatment of 570 °C and 180 min was performed first, oxidation treatment of 400 °C and 20 min was performed, and secondary oxidation of 370 °C and 20 min was performed after polishing. The surface characteristics of the high cycle treated by QPQ were studied by optical microscope, micro hardness tester and friction and wear tester. The results show that the surface of the rising ring after QPQ treatment forms an oxidation film, a Nitriding layer and a diffusion layer from the outside to the inside. The maximum hardness of the ring surface treated by QPQ is 592 HV, which is nearly twice as high as before untreated, and its wear resistance is nearly five times higher than before untreated.

In order to meet the weight reduction of automotive body, low density steels containing about 4wt.% of Al have been newly developed. The microstructure of low-density steel, comprising a mixture of blocky retained austenite, bainite, δ-ferrite and α-ferrite, was produced using a laboratory annealing simulator. The low-density steel exhibits good combination of strength and ductility, whose properties shows tensile strength of 810MPa with elongation of 27.4%. Its extraordinary properties are obtained from δ-ferrite and austenite deformation induced martensite.

The present work was aimed at developing a copolymer oil-displacing agent for enhanced oil recovery (EOR).A novel amphiphilic polymer, AAO, was synthesized by radical copolymerization of acrylamide(AM), 2-acrylamido-2-methyl propane sulfonic acid (AMPS), and an amphiphilic monomer (OPMA),using 2,2'-Azobis (2-methylpropionamide ) dihydrochloride (AIBA ) as initiator. The structure of the sample was characterized by Fourier transform infrared spectrometer (FIIR). The surface / interface tension of AAO aqueous solutions was measured with surface / interface tensiometer. The viscometer was used to measure the apparent viscosity. The emulsifying capacity was researched by drainage rate, microscopy and particle size analyser. The results show that AAO has strong emulsification ability, good surface/interface activity, and thickening property. The emulsion consisting of AAO aqueous solution and cyclohexane was much more stable than that of HPAM (partially hydrolyzed polyacrylamide) which was widely used in EOR.

Materials play an irreplaceable role in the continuous forward development of society, which can guide the progress of society and provide necessary material basis and guarantee for the progress of society. With the development of economy and science and technology, new material technology is in a good development momentum. Apart from the development status of the industry itself, another important reason is the promotion of new demands proposed by traditional industries. For a long time, China has paid much attention to the research and development of new materials, which can be reflected in the national development policies. Once the technology of new materials has been developed for a long time, it can provide guarantee for the overall rapid development of national economy and the improvement of people's living standards. Under this background, we need to strengthen the research on new materials technology.

Manual sampling can easily lead to lack of representativeness and cause quality disputes. Combining with the actual situation of Rizhao Port, the paper discussed the necessity and advantages of removable mechanical sampling equipment for iron ore sampling.the deviation and water loss of the system are compared experimentally and the sampling equipment meets the standard requirements.

The ideal gas is a physical model for studying the properties of gases. As a lot of students feel difficult in learning this part, I will introduce an interesting way to prove the relationship between the volume and pressure in ideal gas, by the assistance of computer.

There are many indicators to measure the performance of power cable materials, among which flame retardancy, conductivity and environmental protection are the most important. In experiment 1, the flame retardancy of sample cables was studied by thermogravimetric analysis, and an analytical method for flame retardancy of cable materials was provided. In experiment 2, the environmental protection performance of the sample cable was analyzed by cytotoxicity test. Finally, a reasonable prospect and forecast for the new power cable in the future is given.

Vehicle lightweight technology has become an important means to solve the fuel economy and environmental protection of vehicles. Carbon fiber reinforced polymer (CFRP) is the best lightweight material for body. The main objective of this paper is to apply CFRP to body panels (hood), the basic performances of CFRP hood were studied by finite element simulation and sample test, Exploring the feasibility of replacing CFRP parts with steel parts and testing its lightweight effect.

Ultrafine crystal materials have excellent mechanical properties and mechanical properties, the preparation of ultrafine crystal materials has been highly valued in actual production and life. Severe plastic Deformation (SPD) method is a newly developed method for the preparation of superfine crystal materials. Groove pressing (GP) method is a kind of SPD method. Compared with other methods, this method with the production process is simple, easy to operate and mass in industrial production. In this paper, through a combination of practical experiments and numerical simulation to analyse tissue samples at different mold structure deformation evolution, the cumulative amount equivalent strain, strain degree equivalent uniformly distributed load changes, as well as fine tissue after deformation of the situation, to explore the structure of the mold plate deformation of molded pure nickel. It used to guide the production and preparation of ultrafine grained plate, as well as industrialization and mass production of ultra-fine grain plate explore the law.

In order to improve the intelligent level of the robotic assembly system, a digital twin model is established to control the robot for automatic assembly of large-scale spacecraft components. Through a three-dimension virtual simulation model of the industrial robot, the physical properties of the assembly elements are described. Then the behavior model is built based on the robot kinematics so that the state of the virtual simulation model can be consistent with the real robot. The interface protocol is set to construct an information model, which can be used for the virtual-real interaction between the simulation model and the physical system. Based on the digital twin model, probabilistic roadmap method (PRM) is performed to generate a collision-free path and control the robot to accomplish the assembly mission. Experiment results show that this method can control the robot to automatically, safely and efficiently complete large-scale components installation.

Biochar has good anatomical structure and physical and chemical properties, and it comes from a wide range of sources. It is of great significance in soil improvement, crop yield increase and environmental improvement. In this study, a japonica rice was used as material. It used four biochar levels to research the effects of biochar on the morphology of rice stem. The results showed that appropriate application of biochar can increase plant height, especially the length of second internode increased significantly. With the increase of biochar, the stem diameter of basal internode (I1) and the second internode (I2) increased significantly, there was an increasing trend of base stem wall thickness, but the difference was not significant. The dry weight per unit length and the dry weight per unit volume will increased with the increase of biochar. The effects of biochar on rice stem strength and lodging resistance should be further studied.

In this paper, the nonlinear constitutive relation of shape memory alloy is proposed. Based on this, the nonlinear dynamic model of a shape memory alloy composite doubly-clamped beam is established. Multi-scale method is used to obtain an approximate solution of the system. Finally, the theoretical results were verified by experiments. The experimental results show that the nonlinear characteristics of the system response in the high-order mode are caused by the hysteresis nonlinear characteristics of shape memory alloy. The results of this paper is helpful for the applications of shape memory alloy composite structure in engineering.

All The architectural structure system generally consists of three parts, namely the roof structure, the support structure and the basic structure. The rational design of the roof structure is the key to ensuring the realization of the ideal interior space, and is also the key to constructing a beautiful image of the building. In this paper, two structural systems, namely the upright and inverted hexagonal pyramid systems were initially selected. The selection of the cross-section characteristics of the members was then introduced. After modeling, loads under several conditions is applied, and then the most unfavorable load combination is selected. After determining the better structure, calculating the total amount of steel used in this structure and the amount of steel used per unit could provide an important reference for our study and engineering needs.

There is no effective special equipment to avoid or stop friction hoist sliding accidents. Study on friction property of braking mechanism for anti-skid device of friction hoist is required. Principle of designing and course of developing were given in this paper, including the principle of anti-skid device friction test, the whole structure of the platform design, mechanical transmission and wire rope brake mechanism procession, hydraulic loading system develop, control system development, experiment data acquisition system development and sensors installation. This experimental platform can be used to study the braking performance of braking mechanism for anti-skid device.

As a new type of oil production machinery, the metal progressing cavity pump has good adaptability for the working conditions of heavy oil thermal recovery. Because the stator and rotor of the metal progressing cavity pump are made of metal, the clearance fit is adopted. This paper analyzes the working principle of the metal progressing cavity pump, studies the clearance of the stator and rotor of the metal progressing cavity pump. Based on the Reynolds equation, the mathematical model of the clearance flow is established. The equivalent model of the axial clearance is established, the friction force and the flow are studied in depth, and the basis for analyzing the leakage and fatigue wear of the metal progressing cavity pump is provided.

TC4 (Ti-6Al-4V) powder prepared by electrode induction melting gas atomization (EIGA) was used as raw material and SEM was used. The morphology, microstructure, particle size, distribution and phase composition of the powder were characterized by laser particle size analyzer and X-ray diffraction analyzer. At the same time, the influence of the powder properties of TC4 alloy for 3D printing was studied. The results showed that the powder prepared by EIGA was mainly spherical with good fluidity. The main particle size distribution of the powder is in the range of 50 ∼ 180 μ m, which meets the requirement of laser 3D printing. When the pressure is 6.0MPa, the loose density of powder is 2.96g / cm³, and the fluidity is 2.24g / s. Staggered acicular martensite α'-phase composition.

In order to study the main bearings lubrication characteristics for diesel engine under elastic deformation conditions, an elastic fluid dynamics simulation model of diesel engine main bearing is established. The law of the load, minimum oil film thickness and maximum oil film pressure of the seven main bearing for the diesel engine is studied. The results show that the minimum oil film thickness decreases gradually with increasing of the bearing clearance of the main bearing, but the maximum oil film pressure gradually increasing. The maximum oil film pressure and the minimum oil film thickness of the main bearing appears in the 3^# and 5^# main bearings.

The hydraulic support is introduced into the single point incremental forming technology to obtain a new single point incremental forming technique with an isostatic pressure flexible support. Thereby, the forming process instability and the defects of the part due to the suspension of the sheet are eliminated. The isostatic pressing system are designed and developed to experimentally study the force in the forming process. The experimental results show that the horizontal forces Fx and Fy in forming process of the new technology have a certain increase compared with the force of the traditional single point incremental forming, but the increase is not large. However, the axial force Fz changes relatively large. As the isostatic pressure increases, the axial force increases.

In this study, a BN/PVDF composite was prepared by hot press method. The dispersion of BN is uniform, dense and oriented in PVDF. The thermal conductivity and tensile performance of the composite are largely enhanced by the strategy. The thermal conductivity is tuned to 0.57 W / (mK), enhanced by 307 % compared with pure PVDF.

A Schiff base compound, 4-hydroxy-benzaldehyd-thiosemicarbazide (C₈H₉N₃OS), has been prepared by the reaction of 4-hydroxy-benzaldehyd with thiosemicarbazide in ethanol-water (v: v = 3:1) solution. The structure of 4-hydroxy-benzaldehyd-thiosemicarbazide was determined by single crystal X-ray diffraction. The result gives that the 4-hydroxy-benzaldehyd-thiosemicarbazide belongs to triclinic, space group P-1 with a = 4.0285(8) Å, b = 10.754(2) Å, c = 21.229(4) Å, α = 92.50(3)º, β = 90.11(3)º, γ = 99.36(3)º, V = 906.5(3) ų, Z = 4, Dc = 1.431 mg·m⁻³, μ = 0.318 mm⁻¹, F (000) = 408, and final R₁ = 0.1508, ωR₂ = 0.3641. The 4-hydroxy-benzaldehyd-thiosemicarbazide molecules form 1D chain structure by the O-H·S intermolecular hydrogen bond interaction.

A new Co(II) complex, [CoL₂·(H₂O)₄]·4H₂O (HL = 3-(4-ethylbenzoyl)propionic acid), has been synthesized by one-pot reaction of 3-(4-ethylbenzoyl)propionic acid, NaOH and cobalt(II) acetate tetra hydrate in CH₃CH₂OH / H2O (v: v = 3: 1) solution. The crystal structure of [CoL₂·(H₂O)₄]·4H₂O has been characterized by single crystal X-ray diffraction analysis. The result shows that the Co (II) complex belongs to monoclinic, space group P1₂₁/n1 with a = 9.911(2) Å, b = 9.4356(19) Å, c = 32.322(7) Å, β = 94.84(3) º, V = 3011.9(11) ų, Z = 4, Dc = 1.353 mg·m⁻³, μ = 0.633 mm⁻¹, F (000) = 1300, and final R₁ = 0.0788, ωR₂ = 0.2311. The geometry around Co (II) atoms is a distorted octahedron. The Co (II) complex molecules form 2D layer structure by the intramolecular and intermolecular hydrogen bonds (O-H···O) present between the O atoms of uncoordinated and coordinated water molecules and O atoms of 3-(4-ethylbenzoyl) propionic acid.

The assembly gaps has been an essential part in the quality assessment process in the field of building the aircrafts. To figure out the changes of the whole structures caused by the assembly gaps, some specific experiments are carried out by recording the shape deviations of the relevant components. And the specific shim with the epoxy and glass fibre mixed is utilized for compensating the gaps, where the solid shim can also be applied. The comparison of compensating effects of the different shims has been illustrated as follows, in which the deformations was prevented effectively with the aid of either of shims. However, deformations in the roots of the gaps can be better limited by the mixed shim, where the max strain can be decreased by around 20%.

In this article the effects of tempering temperature and tempering time on microstructure and mechanical properties of G18NiMoCr3-6 cast steel were studied. The results show that: the microstructure of G18NiMoCr3-6 treated by different tempering processes is tempered sorbite. When tempering temperature is within 510°C ∼630°C, the hardness and strength gradually decrease; the elongation and impact energy gradually increase with the increasing of the tempering temperature. The reason is that the tempering temperature increases the dislocation density decreases gradually, the martensite decomposes and the carbide precipitates, aggregates and grows. When G18NiMoCr3-6 is tempered at 600 °C for 60min∼120min, the microstructure is tempered sorbite. With the prolongation of holding time, the mechanical properties of G18NiMoCr3-6 changed little.

We theoretically investigated the electronic structures and magnetoelectric properties of BiFeO₃/Fe heterostructure based on the first-principles calculations. We found that the magnetic coupling of the epitaxial Fe layer in the BiFeO₃/Fe heterostructure can be tuned by external electric filed, which means the ferroelectronic state could control the magnetic ordering structure of the Fe layer. The corresponding magnetic-electric coupling coefficient was one order of magnitude higher than that for BaTiO₃/Fe.

The static stress of bolts connecting head cover and stay ring in a pump turbine has been analyzed through ANSYS. The 3D flow of the pump turbine was simulated to get the pressure on head cover and stay ring. The stresses of bolts under 2 loading conditions were calculated: preload only as well as both preload and hydraulic pressure. Results showed that the stress of bolts was greater than head cover and stay ring. Stress concentration of bolts appeared at the position where diameter changed. Due to the influence of hydraulic pressure, the stress of bolts became larger. Head cover and stay ring deformed at the position where stiffness was poor.

Through microstructure analysis, hardness testing, tensile and impact tests, the effects of tempering process on the microstructure and mechanical properties of ZG30Mn were studied. The results show that the microstructure of ZG30Mn treated by different tempering processes is tempered sorbite. When the holding time is 60 min, with the increasing of the tempering temperature, the hardness and strength gradually decrease, and the elongation and impact energy gradually increase. When the tempering temperature is 600 °C, the hardness and strength of ZG30Mn gradually decrease with the prolongation of holding time, while the elongation and impact energy increase first and then decrease. According to the analysis, as the tempering temperature increases, the recovery and recrystallization of α-phase occurs and dispersed fine cementite gradually grows and spheroidizes, resulting in a decrease in hardness and strength, and an increase in elongation and impact energy. With the prolongation of holding time, the aggregation growth of alloy cementite results in the decrease of the elongation and the impact energy.

NiCrBSi composite coating was fabricated on 1045 steel substrate by ultrafast laser induced process. The composite layer consists of the coating zone (CZ) and the bonding zone (BZ). Microstructure and chemical compositions were investigated. The morphology of transverse section revealed that the microstructure of the substrate mingled with that of the coatings in BZ, it was showed that the substrate-coating interface was excellent metallurgical bonding. Reticulation structure of Fe-Cr solid solution and blocky structure of Fe-Ni solid solution were formed as solid solution strengthening in CZ. A small quantity of Ni₃Si phases and carbide dispersed in interdendritic structure. Fine particles of carbide and boride precipitated in Fe-Cr reticulation solid solution. The microcracks and pores were eliminated in the homogeneous composite coating, while the coating efficiency was increased.

Weight is an important index system in the evaluation system. In order to improve the objectivity and accuracy of weight calculation in the model of intelligent machining system, we adopt the method of combining subjective with objective, calculate two groups of weights by using entropy weight method and expert ranking method, and then determine the combined weights by combining weights method to obtain a combination of both. The reasonable weight of subjective and objective analysis is used to obtain the intelligent scheduling model of Rail Guided Vehicle in intelligent machining system.

The microstructure and properties of Q460C high strength steel were studied in this paper. The results show that the margin microstructure of the test steel Q460C is banded ferrite + pearlite. The internal microstructure is banded ferrite + pearlite + bainite, the grade of banded microstructure is 2.5. The tensile strength, yield strength, post-fracture elongation and Brinell hardness of Q460C steel are 620MPa, 502MPa, 22% and 175HBW10/3000 respectively. The impact energy of -40°C is above 50J, and a large number of equiaxed dimples are evenly distributed in the impact fracture. The conditional fatigue strength of test steel Q460C under 10⁷ is 250MPa.

Glass molding press (GMP) is an effective method of mass production of glass lens, especially for chalcogenide glass lens. During the process of GMP, the preform is another key factor to achieve a good yield rate except the molding parameters. Three kinds of preforms are provided to conduct the molding experiment, which are made from the same material of chalcogenide glass. The first one is of the rough double-spherical surfaces, and the second one is turned by diamond cutting tools, and the last one is polished as smooth as possible. At the same conditions of 315°C heating temperature and maximum pressing force of 0.7MPa for 45s, only the polished preform can be pressed into a qualified aspherical lens, which has a shape accuracy of 0.875um and of 0.625um in peak-valley (PV) for concave and convex surface, respectively.

Demand for artificial bone based on titanium metal is huge. The 3-D finite element analysis software is used to simulate the force of the bone model, and the internal structure of the model is optimized by the topology optimization method for material saving. The bone is scanned by computed tomography and then a normal 3-D finite element bone model is built on the computer. Based on the normal model, apply force to the model and determine the pressure distribution of the model, and then an internal structure is optimized by topology optimization method. Four basic type of bone forces which are tension, pressure, bending and torque force are applies to the bone model. The result given by the topology optimization method is a multi-layered ring structure inside the bone model, and in each layer there are certain number of pores. The artificial bone structure proposed in this paper can satisfy the basic force of the bone with using minimum of material.

In order to verify the correction of the friction factor fractal model of the end faces for mechanical seals, some tests for mechanical seal were conducted on the self-designed mechanical seal testing device. Experimental sealed medium was 15°C water. A series of experimental data of friction factor were obtained under different spring pressures and sealed fluid pressures as well as at various rotating speeds. Compared the theoretical calculation data with those of experimental, the results show that the friction factor variation of theoretical was the same as those of experimental with the change of the working parameters, the relative error decreased with the increase of rotating speed and sealed fluid pressure, and the maximum relative error was less than 5.5% when the rotating speed reached the normal working speed of 2900 rpm.

With the development of NC Equipment for the direction of high-speed, high power and high reliability, there are lots of complicated and coupling relationship as well as uncertain elements and information between and among the components. Two theory methods that are combined based on information fusion technology and Bayesian network are proposed in this paper. Firstly, more information fusion method can increase the completeness of the fault information to overcome the disadvantages of the single sensor; Secondly, Bayesian network is one of most effective means which not only can decrease the ambiguity of fault information but also improve the speed of fault diagnosis. At last, the experimental study of NC tool-machines is verified to be valid, which strengthens the practical value.

Microcracks are important factor in the early stage of structural material failure. The cellular automata method was improved in this paper to simulate microcracks evolution process for material failure analysis. Basic rules based on generalized energy were defined including cells status, failure thresholds and energy input. The Voronoi algorithm was used to construct a random grid to simulate the influence of grain boundaries. Combining overall and local stress status, a sensitivity parameter was introduced to decide the energy distribution, and the new energy distribution rule could accurately reflect the energy competition mechanism between microcracks. Numerical results are in reasonable agreement with experimental results in related literature. The relation between input energy and cracks numerical density could be used in reliability evaluation.

By the design of molecular structure, improved polyurethane was synthesized and the material exhibited excellent mechanic properties, electrical insulation, resistance to chemical corrosion and UV aging. Its tensile and flexural strength were 58.4 MPa and 101.2 MPa; surface and volume resistivity were 9.68 × 1015 Ω and 2.60 × 1016 Ω.cm, respectively; and their loss modulus was less than 13% exposed under serious chemical substance and UV irradiation. Moreover, the properties of the polyurethane were superior to traditional epoxy and unsaturated polyester resin. Herin, resulted composite material poles and cross arms were operation under demonstration line, and accumulated relevant operating parameters.

The flow stress curves of Ti-25Nb alloy were acquired by hot compressive tests on Gleeble−3500 thermo-simulation machine at the strain rate range of 0.001-10 s⁻¹ and temperature range of 470-620°C. The results show that the flow stresses decrease with the decrease in strain rate and the increase in temperature in general and modified constitutive model established by Strain compensation of n and A has a high predicted ability under experimental deformation condition.

The end face sealing hydraulic testing machine is one of the important equipment for testing the pressure resistance of steel pipes. This paper studies a method to verify the sealing conditions and strength conditions by finite element analysis, and find the minimum actual specific pressure under common water pressure. That is to not only meet the sealing conditions, but also maximize the life of the gasket, and meanwhile, change the traditional way of loading by experience.

To meet the need of the pressure measurement in high temperature oil wells, an extrinsic optical fiber Fabry-Perot(F-P) pressure sensor on the surface of silver coating realized by physical vapor deposition is developed. The F-P cavity sensor fabricated by CO₂ laser thermal bonding technique has characteristics of large dynamic gauge ranges, low temperature sensitive, high temperature resistance and high pressure resistance The pressure resolution of 0.006MPa, the temperature sensitivity is less than 0.005MPa/°C, the repeatability of 0.05%F.S over the full scale from 0 to 42 MPa has been achieved.

Phenanthrenequinone and terephthalaldehyde work as raw materials to fabricate TM1 in which phenanthroimidazole works as matrix. Aldehyde group react with hydrosulphite (HSO₃⁻) to produce addition product, in which electron gain or loss varies and intramolecular charge transfer (ICT) happens, leading to changes of absorption spectrum. According to this mechanism, HSO₃⁻ could be detected. Convenience, fast response time and long lifespan are advantages of the novel fluorescent probe.

Three Droplet coalescence behaviour in T-shaped microchannel under different conditions is investigated numerically using coupled volume of fluid and level set (CLSVOF) method. The effects of continuous phase (water) flow rate and physical properties of dispersed phase are examined respectively. The results show that with the increase of water flow rate, the volume of coalesced droplet decreases, its deformation increases but coalesced time hasn't changed significantly. Droplet coalescence time go down, however the aspect ratio of the coalesced droplet increase first and then decrease in the order of pentanol, octanol and decanol, with no obvious impact on coalesced droplet volume.

The finite element model of a car is established, and the acoustic-structure coupling finite element model of the car is modified considering the influence of structural damping and acoustic impedance of interior material. Through the road test of a real vehicle, the excitation signal and the corresponding interior noise signal under the condition of 50 km/h uniform speed are obtained. Taking the measured excitation signal as the input of the finite element model, the frequency response analysis of the low frequency noise in the frequency range of 20-200 Hz is carried out. The results show that the modified acoustic-structure coupling finite element model can be used to predict the low-frequency noise in the vehicle. The research in this paper can provide reference for vehicle NVH forward design, vehicle vibration and noise prediction and improvement.

Polyimide foams prepared by new technology should be tested each index before application. This article focused on the evaluation of polyimide foam materials which applied in ship. Combined test in typical room and scientific analyzing, we evaluated the polyimide foam comprehensively. In the process of analyzing data which got from the labs which installed polyimide foams one year, we used normalized and standard method for objective evaluation. The result included the advantages and disadvantages of polyimide foams which were very important for popularize of the application in the future.

The traditional two-stage electro-hydraulic servo valve cannot meet the needs of production equipment with large flow rate and wide frequency bandwidth. The structure and working principle of the three-stage jet-pipe electro-hydraulic servo valve are described. As the structure of the three-stage valve is complex and many factors influence dynamic characteristics, the main objective of this study is to establish a mathematical model and investigate those factors. In order to advance the local phase, a proportional–derivative correction link is added to the closed-loop transfer function of the three-stage valve. By simulations, the step response curve and open-loop Bode curve are obtained for analysis in the frequency domain and the time domain. The influences of main factors such as flow gain, pressure gain, main spool area, and feedback-rod rigidity on the dynamic response of the valve are analyzed in the time domain. A three-dimensional model of the armature–feedback-rod component is established and is simulated using the Workbench finite-element analysis software. The influences of various structural parameters are analyzed, especially those of the rod area, section shape, length, and material on the feedback rod rigidity.

The vibration amplitude, vibration frequency, cutting speed, feed rate and cutting thickness in ultrasonic vibration cutting have an important influence on the cutting temperature and the cutting force. Through the mathematical model and finite element simulation, the suitable vibration frequency is obtained. The vibration frequency is used to further simulate the effect of the change in feed rate on the cutting temperature and cutting force.

In this study, the conventional and rheological analysis methods are employed to evaluate the effects of filler particle size and filler/bitumen (F/B) ratio on the high and low temperature performance of asphalt mastics. It is found that the addition of mineral fillers can significantly improve the high temperature rutting resistance of asphalt mastics. Meanwhile, it is detrimental to thermal cracking behavior. As the increase of particle size, the percent recovery R, creep stiffness S and m-value increase, while non recoverable creep compliance J_nr decrease. In addition, scanning electron microscope (SEM) imaging analysis shows that the dispersion degree and the morphology of asphalt mastics with various particle sizes have the great differences.