Table of contents

Climate change causes extreme weather in Macao, especially typhoons and flooding. In this paper, some raw flood data is missing from the Macao Meteorological and Geophysical Bureau, due to some flood sensors that were damaged during Typhoon Hato in 2017 and Typhoon Mangkhut in 2018. So we use data interpolation to construct new datasets and curve fitting to simulate real inundation depth. Besides this, we explore Neural Network, Long Short-Term Memory, Random Forest, Adaptive Boosting, and Linear Regression for analyzing, comparing, and evaluating the best combinations of flood prediction models, datasets, and scenarios caused by typhoon presence in Macao. Furthermore, we apply Bayes Network to the aforementioned models to evaluate the accuracy of predicting flood situations because of typhoons. The experiment results show that the different models achieve a different performance in predicting specific scenarios.

This paper studies the feasibility of two-dimensional microwave respiration monitoring. According to a real human computed tomography image, the chest cavity is established in the simulation, which is more realistic and persuasive. Based on the formula of 4-Cole-Cole expressions, some corresponding parts of the human body's relative permittivity and conductivity are calculated. Moreover, the dielectric properties within the lungs will change during respiration, and the changes will affect the transmission of microwaves in the human thorax. In this paper, the frequency of 433MHz and 915MHz is adopted to monitoring respiration. The simulation data is collected and analyzed to get intuitive maps. In summary, this study illustrates the feasibility of microwave respiration monitoring.

In order to understand the latest research progress, research trend and future research hotspot of remediation of soil organic pollutants at home and abroad, this paper uses the core database of web of science and its own literature analysis tools, vosviewer visual analysis software and origin, etc., and publishes the top 10 countries (regions) in the amount of papers and publications at different times, research institutions, research directions, journal sources and other types of published literature on remediation of soil organic pollutants were analyzed. The results showed that: with the growth of time, the number of publications increased gradually; China, the United States and Spain ranked in the top 3, among which China had 9 organizations in the top 10; the journal with the most publications was Chemosphere, while the journal with the most citations was water research, indicating that the remediation of soil organic pollution mostly drew lessons from the remediation of water organic pollution.

The fundamental cause of friction and wear is the effect of force, resulting in material heating, deformation, fatigue, adhesion and furrow effect, which is closely related to the micro-topography of the contact surface of friction pair. How to establish the real three-dimensional (3D) rough surface, using inter-polation surface reconstruction based on real data, especially in the three dimensional precision measurement data processing, etc, also the lack of research and practice, so in this paper, fractal interpolation and spline interpolation, Fourier interpolation surface modeling interpolation algorithm of three methods for modeling, a detailed analysis and expounds the advantages and disadvantages of the three ways of modeling with surface, and finally to the surface of the atomic force microscope to measure the actual extraction of a small number of sampling points are simulated.

Anhui's food resources are rich and colorful, and the conditions for the development of food tourism are unique. The article introduces Anhui's unique "special dishes", "famous teas", "flavor specialties" and "morning tea culture" and other gastronomic cultural resources, analyzes the current status and problems of the development of Anhui's food tourism, and proposes the development of different guidelines for Anhui food tourism projects. Finally, giving advice on the development of Anhui food tourism from "cultivating leading food enterprises, establishing a sense of gourmet brand", "creating a batch of local food tourism products", "Establishing quality standards of Anhui's local brands, famous delicacies, and special flavor products", "Designing tourism routes with the help of Anhui celebrity culture and time-honored brands" and other six aspects.

As the civilization progresses, the issue of garbage classification is becoming of widespread concern for the global community. Traditional garbage classification has problems such as low efficiency, high cost and poor classification effect. In response to these problems, a new garbage classification system based on convolutional neural network algorithm is proposed. It combines software and hardware realizing the functions of identification, classification and unified management of garbage. Advantages, such as high efficiency, low cost, accuracy and stability, have been demonstrated.

Urban agriculture provides economic, social, and cultural functions that improve human health and well-being for individuals and communities that reside in cities. However, with high land values and densely populated areas, available spaces for urban agricultural development are relatively rare. This research aims to explore feasible ways for residents that live in dense urban apartments to operate urban agriculture within the confines of a limited space. The design strategies for apartment farming will be summarized, which will provide opportunities for urban residents to grow fresh food, despite living in dense urban areas.

This article using the spatial econometric analysis technology to build a space from the perspective of geographical feature weighting matrix, spatial correlation of the regional economic growth and integration, to explore the ecological innovation capacity and regional spatial spillover effect of economic growth, and using the spatial regression model decomposition of the partial differential method of actual effect based on 2009-2017 panel data from 29 provinces cities and autonomous regions in China. Based on the data of 29 provinces and cities in China from 2009 to 2017, this paper constructs the spatial weight matrix from the perspective of geographical features, establishes the spatial panel econometric model, and investigates the spatial correlation and clustering of regional economic growth uses spatial econometric analysis technology. We explore the spatial spillover effect of ecological innovation ability and regional economic growth, and uses the partial differential method of spatial regression model to decompose this effect. The results show that, firstly, China's regional economic development is not balanced, and the economic development of neighboring regions is basically the same, which has a certain degree of spatial agglomeration and significant spatial correlation, and China's economic growth has significant spatial heterogeneity. Second, the ecological innovation environment has a great spillover effect on the economic growth of neighboring regions, and the human resource level and capital investment have significant positive spillover effect between neighboring regions. The coefficient of ecological innovation output is significantly negative. Thirdly, the regional flows of capital input, labor force, the level of opening up, industrial structure and human capital not only have obvious direct effects, but also have a significant promoting effect on economic growth through the spatial spillover effect. The conclusion of this paper provides policy enlightenment for promoting sustainable economic growth among provinces and regions in China.

In recent years, the importance of environmental protection and ecological civilization construction in China is increasing, the market demand of environmental protection equipment in China is increasing, and the related environmental protection equipment companies have also ushered in important development opportunities. As the primary link of innovation, increasing R&D investment has become an important measure for enterprises to enhance their core competitiveness. In environmental protection equipment companies, the competitive advantage of enterprises is the core technology, and the core technology is also the fundamental driving force for the development of environmental protection equipment companies. The most efficient R&D enterprises can usually lead the technological trend of the industry. Therefore, this paper mainly selects four representative listed environmental protection companies in the field of water environmental protection in the environmental protection equipment industry, and analyzes the R&D of the above environmental protection companies from the perspective of R&D intensity and R&D scale Technical input status and existing problems, and put forward corresponding solutions for reference.

The paper uses a method that combines biological characteristics and 16S rDNA sequence characteristics to analyze potato scab bacteria collected from China. The study found that the obtained universal detection primers B1/B2 showed good specificity for all pathogenic strains, and could stably expand the target band, while non-pathogenic strains had no bands. The paper uses the spore dilution method to verify that the established detection method has a sensitivity of 20 pg·μL-1 for strain DNA, and the detection threshold for spores is about 4.0 CFU/μL. The genome amplification results of the test samples showed that the target bands were detected in the scab pathogen Streptomyces, diseased potato sample tissues, and diseased soil samples, but not the scab pathogen Streptomyces, healthy tuber tissues, non-sick soil samples and other strains None of the bands of interest were expanded, indicating that the method has good specificity. Therefore, we can conclude that the qualitative detection method of potato scab bacteria can realize rapid detection of strains, diseased tissues and soil samples.

Through the analysis of the measurement model of the environmental and economic data of Shandong Province from 1989 to 2003, it is found that the fitting curve between industrial "three wastes" emissions and economic growth does not completely conform to the characteristics of the typical environmental Kuznets curve. This paper believes thinks that the economic development, changes in industrial structure, upgrading of energy consumption structure, policy and technology are the main factors leading to the non-typical environmental Kuznets Curves in Shandong province.

Along with the rapid urbanization of China, the construction waste disposal becomes an urgent problem than ever before. Through evolutionary game simulation, we studied the evolution law of government - enterprise - social governance system by using simulation and analyzed the case of "12 20" special heavy landslide accident in Shenzhen construction waste dumping site. Results indicate that the economic efficiency of the risk strategies, the strength of social supervision, the punishment intensity of government and the cost coefficient of illegal waste disposal all have a significantly influence on the multi-parties evolutionary game model. It is concluded that, for the effective supervision of construction waste disposal, government should built social supervision mechanism, promote the strength of social supervision, enhance the punishment intensity of government, and reduce the risk income of waste disposal enterprises.

Wetland ecosystem can be influenced by many eco-environmental indexes, which will affect the ecological environment quality to varying degree. In this study, weights of different indexes that will have a influence on wetland ecosystems can be determined using Analytic Hierarchy Process (AHP) approach. Based on the field survey of Wuleidaowan National wetland and distribution of 400 questionnaires to environmental experts and workers managing wetland, of these 398 were returned, the environmental evaluation of wetland system can be fully conducted. The target of the study was divided into four main evaluation criteria, ecological resources(B₁), wetland landscape(B₂), infrastructure(B₃), management(B₄), and the four evaluation criteria were further divided into 17 indexes at the bottom level. The results of target index layer sorted by combination weight analyses indicated that species diversity, ecosystem typicality, overall style and wetland water resources have the greatest influence on determining the ecological environmental quality of Wuleidaowan National wetland. In addition, the comprehensive evaluation index(CEI) of Wuleidaowan National wetland is 0.9443, namely 0.7<CEI<1.0, showing ecological environment in Wuleidaowan wetland is very excellent on the whole. However, based on the findings, there is a need further to strengthen community co-management, regulate conservation of recovery, improve science value and aesthetic value and optimize the mission facilities to plan, manage and protect the Wuleidaowan National wetland ecosystem.

In this paper, the exposure ways and risks of lead in the shooting field are discussed, the factors influencing lead migration in the soil are analyzed, and the control measures and the methods of removing and recovering lead in the soil are summarized. The results demonstrate that soil pH has a great influence on the mobility of lead, which can be reduced by applying lime to improve soil pH. However, this approach is only suitable for daily maintenance. The removal of lead completely depends on screening and soil leaching, which can remove more than 99% of the lead particles.

China is a large agricultural country, and the long-term use of pesticides in the development of agriculture has a certain toxic effect on human health and safety, which may cause cancer, teratogenicity, mutagenicity and other related symptoms. Technical analysis of pesticide residue monitoring is an important method to protect food safety, and the analytical technology of pesticide residue in agricultural products in china has made substantial progress. In this paper, the research progress of modern pesticide residue pretreatment technology and detection technology were described, as well as the development trend of pesticide residue detection technology. On this basis, the application of ultra performance liquid chromatography-tandem mass spectrometry (UPLC/MS-MS) technology was proposed to establish a highly sensitive and rapid method for the simultaneous detection of eight kinds of pesticide residues in agricultural products. In order to provide reference for the in-depth study of pesticide residues.

The rational utilization and protection of ecological environment and resources has become the main premise of social development and construction. In the planning and design of urban gymnasium greening project, the concept of green energy saving has been popularized and become the main idea of planning and design of new urban gymnasium greening project. Gymnasium has higher energy consumption than other buildings because of its different characteristics and usage. Therefore, the gymnasium has great influence on energy and environment. Energy-saving design of gymnasium plays a vital role in energy saving, environmental protection and ecological construction of gymnasium. The full text starts from practice, based on the on-the-spot investigation of the form of city gymnasium, and through the problems found during the on-the-spot investigation, discusses the solutions to the practical problems of city gymnasium, puts forward the design principles of the form of city gymnasium, and provides a referential guiding framework and theoretical basis for the design of city gymnasium.

Under the policy of achieving carbon peak before 2030, the paper predicts whether Jiangsu province can achieve the peak of carbon emissions before 2030. Based on the data of Jiangsu province from 2001 to 2018, the paper uses Lasso regression model to screen out 8 significant factors affecting carbon emissions, sets the values of each influencing factors during 2019-2030, and uses the BP neural network model to predict the carbon emissions of Jiangsu province during 2019-2030. The prediction results show that Jiangsu province will achieve the carbon peak in 2023 under the hypothetical scenario, with the peak carbon emissions of 335.1755 million tons.

As an important part of passive ultra-low energy building envelope structure, exterior windows play a very important role in lighting, heat gain, and thermal insulation. Passive doors and windows are currently mostly installed externally, and high installation costs, material costs, and safety have become obstacles in the promotion of energy-saving policies. We calculated and simulated the linear heat transfer coefficient of the window opening based on the software flixopro8, and obtained the window installation position with the smallest linear heat transfer coefficient between the door and window and different wall structures and the decisive factors affecting the linear heat transfer coefficient of the door and window opening.

In this paper, the operation characteristics of a 480t/h ultra-high pressure pulverized coal fired boiler with municipal sludge were studied. The results show that: mixing sludge has a negative impact on the thermal efficiency of boiler operation, and with the decrease of boiler evaporation and the increase of sludge mixing ratio, the decline of boiler thermal efficiency increases, but mixing sludge can effectively reduce the emissions of nitrogen oxides and sulfur dioxide in the boiler. Through the optimization and adjustment test, it is found that the optimal oxygen content of the boiler is 3.61% when the proportion of sludge is 5%.

During the 13th Five-Year Plan period, China's nuclear and radiation emergency regulations and standards system was gradually strengthened, emergency organizations at all levels were constantly improved. However, there are still some deficiencies in the construction of emergency team, professional technical ability, emergency rescue and so on. This paper comprehensively summarizes the experiences of nuclear and radiation emergency in China during the 13th Five-Year Plan period, and studies the development direction and capacity buildings in the period of the 14th Five-Year Plan, which provides a reference for the construction of nuclear and radiation emergency in China.

As one of the main forms of urbanization in my country, urban construction is the process of building original natural or semi-natural ecosystems into urban artificial ecosystems from the perspective of ecology. It is the construction and replacement of ecosystem types and the process of encroachment. Urban planning must pay particular attention to the forward-looking nature of its ecological planning. While truly enhancing the city's overall ecosystem service capabilities, it also prevents new ecological and environmental problems from being induced. Through theoretical analysis of the characteristics of ecosystem changes in the process of urban construction, combined with typical cases, several key issues in urban ecological planning have been summarized and condensed, and corresponding planning strategies and techniques have been proposed, with a view to providing ecological solutions for large-scale urban development in my country. Provide theoretical support for environmental protection work.

Soil is a key component of ecosystem. It is not only the most active interface for material circulation and energy transportation, but also the substrate and space for animals and plants to survive, and has extremely rich biodiversity. Soil occupies the central position of the key zone in the entire nature, which carries about 90% of the pollutants. At the same time, it is an important "source" for the migration and transformation of pollutants to the atmosphere, water and other environmental media. This article discussed the drug resistance mechanism of bacteria and the transmission route of antibiotic resistance genes, taking antibiotics, heavy metals and organics as representatives to discuss the impact of major pollutants in the soil on the transmission of drug resistance genes, in order to provide guidance for public health and environmental safety.

With the rapid development of the container industry, the use of container houses has become extensive. This paper uses the method of orthogonal experiment to study the change of the energy consumption of the container by changing the size, height, direction of the container window and the direction of the container building. The building used a container house in Xiangfang District, Harbin City, Heilongjiang Province, China as a case. 71 scenes were created, 3D modeling was performed using Revit and imported into Green Building Studio for Energy Use Intensity (EUI) calculation. This research is divided into three processes. The first process is to study the impact of window-to-wall ratio. Through the first process, a rule is obtained, and the height of the window has the greatest impact on energy consumption when the window-to-wall ratio is 0.2. Therefore, in the second process, the window-to-wall ratio of the windows is fixed to 0.2. When the height of the windows of different orientations changes, the energy consumption of the container house changes. In the third process, based on the results of the first two research processes. the orientation of the container house is changed, namely the north-south orientation and the east-west orientation, and the energy use intensity calculation is performed again. The results show that the window-to-wall ratio has the greatest impact on the energy use intensity of the container house. The larger the window-to-wall ratio, the greater the energy consumption. The height and orientation of the windows have an impact on the energy use intensity but not much.

Coastline is an important geographic background for each coastal area, and dynamic monitoring of coastlines is beneficial to coastal natural protection and further coastal construction and development. Based on the Landsat8 data and Sentinel-2 data from 2014 to 2019, this paper uses a method combining regional growth and edge detection to analyze the Cixi section's coastline changes on the south bank of Hangzhou Bay. Firstly, the multi-source remote sensing data is preprocessed, and then the MNDWI value of each image is calculated. Then, each image is processed into a binary image by a regional growth algorithm. Eventually, we realize the coastline segmentation by the Canny operator of edge detection. The research represents that the coastline of the south coast of Hangzhou Bay moves toward the ocean year by year, and the length of the coastline generally decreases. The analysis may be caused by human-made activities in Hangzhou Bay Area in recent years, such as river cut-offs and urban construction. The research in this paper provides a reference for the protection of natural coastlines and human-made coastlines.

The emergence of low-cloud and low-visibility can affect air activities, and bring huge economic losses to airlines. Based on the aviation meteorological observation, forecast and airport alert of Pudong and Hongqiao airports, this paper analyses the meteorological service effect of a low-cloud and low-visibility weather process in Shanghai from January 27th to 28th, 2016. The results show that: (1) The absolute error between forecast and actual situation of Pudong and Hongqiao airport presents an obvious normal distribution and the forecast accuracy of Pudong is higher than that of Hongqiao. (2) For the airport with cloud ceiling of 30m∼60m and prevailing visibility of 600m∼800m, the alert of Pudong airport is more accurate and advanced, but for the airport with cloud height of less than 30m and prevailing visibility of 400m∼600m, the airport alert is quite different from the actual situation, and lacks lead time. (3) The alert of Hongqiao airport is accurate for the airport with visibility less than 800m from 03:30 to 10:30 on 28th, and the lead time is relatively high. However, it lacks the lead time for the airport with prevailing visibility greater than 1000m at 11:00 on 28th.

This article uses and validates the analytical methods for the determination of aniline and 3,3'-dichlorobenzidine in soil by gas chromatography-mass spectrometry, and discusses the determination of semi volatile organic compounds in soil by gas chromatography-mass spectrometry. The feasibility of the application. The results showed that the semi volatile organic compounds aniline and 3,3'-dichlorobenzidine target corresponding to the internal standard response value and concentration showed a good linear relationship, the correlation coefficient was between 0.9997 and 0.9983 respectively; the detection limit was 0.04 mg, respectively/kg and 0.04mg/kg, the limits of quantification are 0.2mg/kg and 0.2mg/kg; the relative standard deviations of the two semi-volatile organic compounds in the precision are 2.5∼16.9% and 3.6∼6.2%, respectively; the accuracy is 2 The recovery rates of these volatile organic compounds were 64.5-83.9% and 72.6-74.3%, respectively. The verification results show that the linear relationship, detection limit, precision and accuracy all meet the requirements of "Determination of Semi-volatile Organic Compounds in Soils and Sediments by Gas Chromatography-Mass Spectrometry" (HJ 834-2017). Using gas chromatography-mass spectrometry technology can achieve fast, accurate and sensitive detection of target substances, and can meet the detection requirements of trace semi-volatile organic compounds, so this method can be better applied to the detection of soil and other environments.

in recent years, China's economy has made great progress, its development is based on energy consumption as the energy power, the problem of energy consumption is that the pressure on the environment is increasing day by day. The pollution caused by the combustion of fossil energy is especially serious. China's future economic development, energy development is both the foundation and guarantee, and clean, pollution-free environment is the necessary basic conditions for our human survival. Therefore, how to achieve the coordinated and sustainable development of economy, energy and environment is an unavoidable subject in the future economic development of our country.

ICP-MS is a new technology for environmental monitoring and analysis. This article summarizes the characteristics of ICP-MS and its application in the analysis of environmental samples such as soil and water, and summarizes mass spectrometry interference factors such as isobaric, oxide, double charge, and polyatomic ions, with a view to future ICP-MS.

The anti-fatigue effect of macadamia (Macadamia integrifolia) protein and hydrolysate prepared with basic protease were investigated. Random mice grouping was carried out to create 4 groups including the control group and protein hydrolysate groups at low (150 mg/kg·d), medium (500 mg/kg·d) and high (1500 mg/kg·d) doses. All groups were treated by gavage for 28 consecutive days. Weight-loaded swimming test, serum urea nitrogen, serum creatine kinase activity, blood lactic acid and liver glycogen assays were performed to assess its anti-fatigue effect. The results showed that macadamia protein hydrolysate could significantly prolong weight-loaded swimming time, promote synthesis of liver glycogen and decrease blood urea nitrogen and lactic acid. Moreover, it can also significantly reduce serum creatine kinase activity. Therefore, macadamia protein hydrolysate had significant anti-fatigue function.

In this study, macadamia peptides were produced by ultrasonic-assisted alkaline protease, and five components were separated by ultrafiltration centrifuge with different molecular weight (1kDa, 3kDa, 10kDa, 30kDa). The amino acid composition, solubility, water absorption capacity and emulsifying properties of five components were compared. Results showed that all macadamia peptide components were rich in amino acid species, the contents of essential and hydrophobic amino acids ranged from 189.59 to 281.10mg/g and 204.26 to 258.78mg/g, respectively. Meanwhile, the small molecular weight components (MP-1) showed the best solubility and water absorption capacity, large molecular weight components (MP-5) had the best emulsifying properties. This result indicated that the distribution of molecular weight had significant effects on the amino acid composition and functional properties of macadamia peptide components. This study provides a theoretical basis for the further development of macadamia peptide products.

With the development of economy society, urbanization process are accelerated, the tension of the urban land using leads that the cities develop to the low-lying parts, and even occupy river, landfill ditch pond, it makes perched water space of the city narrow, rainfall runoff coefficient increasing, the confluence time speeding up, it increases urban flood risk. Urbanization has changed the urban hydrologic cycle characteristics, so as to make the urban rain flood characteristics changing, it easily causes short duration rainstorm seeper-waterlogging, so as to directly influence the urban residents' lives and causes great economic losses, even casualties. City is the political, economic and cultural center, once suffered from floods, it will cause great political influence and economic losses, so, it's necessary to analysis urban storm flood reason and put forward the corresponding countermeasures. This paper mainly discusses the urban waterlogging reason and influence on storm runoff, and discusses the countermeasures.

Fenton oxidation technology has a good effect in the repair of soil organic pollution. The article emphatically introduced the working principle and research status of Fenton technology to remediate soil organic pollution, and made a prospect for the development of Fenton technology.

Since the reform and opening up, China has been adhering to the extensive economic growth model, which has led to serious environmental damage, energy depletion, global warming and environmental pollution and other environmental problems have been increasingly prominent. The root of environmental problems lies in external diseconomy. Environmental pollution has obvious negative external effects, as environmental resources are public goods, enterprises will not increase their own costs in using or consuming public goods, but the society has to bear the marginal cost in providing the goods, which will lead to the inconsistency between social cost and private cost, thus causing excessive damage to the domestic environment. In the past, our country mainly governs by administrative means, and the shortcomings such as high management cost and poor effect in the implementation process are increasingly obvious. Combined with the treatment process of environmental pollution in western countries, economic measures have a good effect on the external diseconomy of environmental problems. According to the current environmental problems and governance status in China, environmental governance means in urgent need of transformation. Based on the literature, this paper analyzes the current situation of environmental pollution in China and the mechanism of economic means in environmental protection, puts forward the means of environmental governance and protection from the economic level, and discusses the future direction of environmental governance.

Soil arsenic pollution is a global problem that seriously threatens human health and environmental safety. Excessive arsenic content in the soil will inhibit the growth and development of plants, kill beneficial microorganisms in the soil, and damage human health after entering the human body through the food chain. This article describes the current status of soil arsenic pollution, the sources of arsenic pollutants, and the hazards of arsenic pollution to plants, microorganisms and human health. And the prospects for the treatment of arsenic pollution were prospected.

The impact ground pressure is currently restricted mine production and safety of one of the typical dynamic disasters, this paper USES the two-dimensional evaluation method from two dimensions of risk and possibility analysis of the impact of the situation in a coal mine in shandong province, using fault tree (FTA) to determine the impact, with grey correlation analysis to find out the key factors that affects the risk impact and to improve the traditional fault tree analysis method, effectively solve the traditional fault tree in uncertain complex system are not suitable for as a quantitative analysis of the defects Combined with the field mining simulation of Shendong Group to judge the stress concentration and migration, to assist in verifying the impact risk of Shendong Coal Mine, the multi-parameter early warning system combining geological factors and mining factors is established, and the key factors of impact risk are corrected.

This study investigates variations of air quality index (AQI) for air pollutants in the metropolitan area (New-York-Newark-Jersey City; NY-NJ-PA) during 2010 - 2019 to identify the key influential factors for air pollution using grey relation analysis method. The results show that the annual averages of daily AQI values for multiple pollutants in NY-NJ-PA generally decreased except O3. The AQI values of O3 fluctuate greatly. The main factors affecting AQI values of CO, PM2.5, O3, SO2, and PM10 are the emissions of CO2, SO2, and NOx, whereas the main factors affecting AQI values of NO are the emissions of SO2, population, and NOx.

To study the solidification effect of red mud, calcium carbide residue, and phosphogypsum mixture on Cu²⁺-contaminated soil under the soaking condition, the stress-strain, leaching toxicity, and microstructure of solidified soil with cement and mixture were systematically analyzed. The results show that the peak stress of the mixture solidified soil increases with the curing age, and the addition of solid waste is beneficial for the improvement of peak stress. Its leaching concentration of copper ion is not only lower than that of cement solidified soil, but also lower than 0.6mg·L⁻¹. Besides, the leaching concentration decreased gradually with the curing age. According to the microstructure of solidified soil, it is found that the hydration products of the solidified soil are mainly represented by calcium silicate hydrate/calcium aluminosilicate hydrate and ettringite, which play an important role in the development of the strength and the solidification of copper ions.

The remediation effect of biochar on Cu, Cd, Pb and Hg compound contaminated soil was studied by adding different concentrations (0%, 5%, 10%) of pig manure carbon and fruit charcoal into the soil contaminated by tailings by biochar and plant pot experiment. The results showed that the addition of biochar could effectively reduce the content of heavy metals in soil, and the effect of fruit charcoal was significantly better than that of pig manure charcoal, and when the addition of fruit charcoal was 10%, the remediation effect of copper, cadmium, lead and mercury compound contaminated soil was the best.

One of the main source of heavy metal wastewater is the electronics industry. If treated ineffectively, it may be discharged into water bodies, causing water body pollution and endangering human health. Traditional treatment methods have a poor quality of wastewater and high treatment process costs. This subject takes the low concentration of lead and copper wastewater from a lead storage battery factory as the research object, and uses the principle of the precipitation of Thiobacillus acidophilus to remove lead and copper from the wastewater. The results show that at a temperature of 30°C, pH of 2.5, and rotation speed of 130r/min, acidophils have the highest removal rate of 74.69%, 38.48% for lead and copper, respectively.

Carbon emission intensity is an important indicator to evaluate the urban development level. Taking Fuzhou, a low-carbon pilot city of China in Jiangxi Province as an example, based on the current levels of energy consumption and carbon emissions, this paper proposes the concept of "the marginal effect of carbon emission intensity" and analyzes the eleven factors influencing the decline of carbon emission intensity in low-carbon cities. Results show that the rise of carbon emissions in industrial sectors are the main reason for the abnormal increase in the carbon emission amount and intensity of Fuzhou, and that the coal consumption level, GDP and electricity sent out to other cities are the key factors influencing the decline of carbon emission intensity. Based on the analysis, countermeasures and suggestions are put forward as a reference for the municipal government in the construction of low-carbon cities.

Aroma is an important factor in the quality of green tea. In order to explore the effect of Exocarpium Citri Grandis(ECG) on the aroma formation of green tea, the aroma components of green tea were extracted and identified by HS-SPME-GC-MS. The results showed that the main aroma components of green tea were D-Limonene (58.69%), γ-Terpinene (14.51%), Myrcene (9.82%), 2,2,4-trimethyl-1,3-pentanediol diisobutyrate (3.98%) and caffeine (2.67%).After co-fermentation with ECG, the main aroma components of green tea were changed to D-Limonene (33.64%), 2,2,4-trimethyl-1,3-pentanediol diisobutyrate (11.7%), γ-Terpinene (9.38%), 2-pentadecanone (8.93%) and caffeine (6.04%).The content of terpenessuch as D-Limonene decreased, while the content of aromatic components such as linalool increased, and the types of volatile components increased in green tea. Among the newly added volatile components, the higher ones were2-pentadecanone (8.93%), β-ionone (2.76%) and dihydroactinidiolide (2.17%), which can give green tea fruity, violet and coumarin aroma. This study indicated that ECG contributes to the enrichment of greentea aroma, which provides theoretical support for the development of mixed tea with unique aroma.

The application of the Internet of Things to precision agriculture is conducive to the intelligent and controllable aspects of agricultural production and management, is conducive to the implementation of green agricultural production methods, is conducive to the sustainable development of agriculture, and promotes the structural reform of the agricultural supply side. An intelligent greenhouse environment monitoring system is designed based on the Internet of Things technology, and a wireless network is established using the JenNet protocol to realize real-time monitoring of environmental factors such as air temperature and humidity, soil temperature and humidity, light intensity, and CO₂ concentration in the greenhouse. Finally, the paper uses the time automata modelling tool UPPAAL to verify the system logic correctness and system execution timing verification on the established formal model. The results verify that the agricultural temperature control environment system network based on the intelligent Internet of Things operates stably, with high acquisition accuracy, low node power consumption, accurate feedback control, and meets the intelligent demand for greenhouse data acquisition and control.

In view of the current problems of sludge drying, this article mainly proposes a sewage source heat pump + solar heat collection system sludge drying technology, and expounds the feasibility of using sewage source heat pump and solar heat collection system as the heat source for sludge drying. The main principles, the structural characteristics of the main equipment and the operation precautions. It is clarified that this sludge drying method has good expansibility and practicability, and has the value of engineering application and further development.

The energy consumption of the heating furnace is an important part of the energy consumption of the oilfield gathering and transportation system. The low energy efficiency of the heating furnace will directly lead to the increase of oilfield production costs. In response to the national energy-saving and emission-reduction policy, the oilfield has implemented energy-saving practices in heating furnace load adjustment, efficient combustion, excess air coefficient control, flue gas waste heat utilization, and furnace modification. It is clear that the energy efficiency of oilfield heating furnaces is still lower than foreign advanced levels. There is an urgent need for further energy conservation and efficiency enhancement. MVR low-temperature flue gas heat recovery technology, flame shape matching technology, nanofluid heat transfer enhancement technology, solar auxiliary heating technology and other new technologies that can be used for energy saving and consumption reduction of oilfield heating furnaces provide a reference for oilfield heating furnaces to tap the potential and increase efficiency.

With the gradual increase in the comprehensive utilization rate of industrial solid waste, the quality and safety of drilling solid waste recycling products have become increasingly prominent. This article starts with the hazards of drilling solid waste resourced products to the human body and the environment, adopts the method of hazard factor identification, constructs a qualitative and quantitative index system for the quality and safety evaluation of solid waste resourced products, and proposes corresponding evaluation procedures and countermeasures.

Urban development should get rid of the stereotypical design and planning mistakes, so as to pursue the prominence of local characteristic culture, bring the expression of regional culture with landscape design, and make the city more characteristic and impressive. In urban landscape design, it is necessary to excavate regional cultural elements, attend to the regional culture, and truly integrate regional cultural characteristics into urban landscape design. This work mainly discussed the penetration and prominence of regional culture in urban landscape design, and reflected on the embedded ideas and strategies in urban landscape design of urban regional culture through taking Luoyang as an example, so as to create a vivid city card with urban landscape design.

Activated carbon is widely employed as an adsorbent in environmental protection, food, medicine, chemical industry, energy and other fields due to its good physical and chemical properties and low price. However, the resulting large amount of saturated activated carbon is easy to release harmful substances in the high temperature environment. Even if the saturated activated carbon is treated with harmless regeneration technology, it may lead to secondary pollution owing to improper disposal. Therefore, on the basis of summarizing the traditional methods of activated carbon regeneration, combined with the research progress in the laboratory, frontier progress of new activated carbon regeneration technology are elaborated in recent years in this paper, and the development direction of activated carbon regeneration technology are also presented in the end of the paper.

Ecological environment is the foundation and prerequisite for the development of rural tourism. The development of rural tourism promotes the rural ecological environment. The coordinated development of the two is of great significance to the sustainable development of rural tourism and the construction of ecological civilization in rural areas. Here, this article briefly summarizes the current plight of rural tourism and the relationship between rural tourism and the ecological environment, and puts forward some suggestions for the joint development of rural tourism and ecological environment protection, and pays attention to the protection of the ecological environment while recognizing the development of rural tourism, to achieve the harmonious and common development of rural tourism and the environment.

Innovative companies often face strong resource disadvantages, making it difficult to gain a foothold in emerging industries. Existing research still lacks an in-depth investigation of the internal mechanism of how innovative companies in emerging industries break through resource constraints, successfully develop entrepreneurial opportunities, and then build competitive advantages. Based on this, this article sets a new orientation for the training objectives of innovative and entrepreneurial professionals in the maintenance of new energy vehicles, designs a connection plan, builds an integrated curriculum system, and optimizes professional courses at different stages.

Human resource exists in all management work. The 5P model is the top priority of human resource management and the foundation of human resource management. Applying the 5P model to public institutions in China, a reasonable management system can be established, which takes job design as the premise, personnel selection as the key, performance management as the core, salary management as the focus, and improving work enthusiasm as the auxiliary.

The adjustment of coal energy resource tax is an important price control method to realize energy saving and emission reduction and promote low-carbon economy. The global financial crisis and my country's economic recovery provide a favourable opportunity for coal resource tax adjustment. Combining the current background of the new era of energy conservation and emission reduction, the paper builds a China Energy CGE model based on the actual situation in China, and calculates the impact of ad valorem tax rates on different coal resources. The results of the study found that the coal resource tax reform has a weak negative impact on the economy. Considering the tax return scenario, it cannot only offset the impact, but also drive a small increase in GDP; the coal resource tax reform will not push up the CPI, deregulate electricity prices, and considering the tax rebate has a more obvious restraining effect on prices; the coal resource tax reform is conducive to improving the structure of domestic demand. Similarly, considering the tax rebate scenario, the effect is more obvious. Coal resource tax reform can reduce the output of high-energy-consuming industries, which is conducive to energy conservation and emission reduction.

The digital transformation of regional innovation ecosystems is received by the extensive attention from academia and practical communities. This paper uses China's regional innovative ecosystem as a research object, explores changes in information flow, resource flow, capital flow and technical flow direction and flow rate within the context of digital transformation. The study found that digital transformation will change the flow direction and structure of the information flow; The flow rate of resource flow, capital flow and technology flow is accelerated is increased, but the flow direction is unchanged. Finally, the potential risks of innovative ecosystem under digital transformation background have been analyzed, and the countermeasures and recommendations for relevant management departments and enterprises are put forward, providing a theoretical reference for further improving digital construction for China's regional innovation ecosystems.

Undoped and Cu-doped ZnS were sucessfully synthesized by hydrothermal method. X-ray diffraction, Fourier transform infrared spectrometer, scanning electron microscope, transmission electron microscopy and UV-vis spectrophotometer were used to characterize the synthesized products. Characterization results indicated that Cu has been successfully doped into ZnS, and the doped material was smaller and had looser surface. In addition, the band gap was decreased from 3.50 eV to 2.27 eV through doping of Cu. Photocatalytic degradation of tetracycline confirmed the superiority of Cu-doped ZnS compared with ZnS, and the electron paramagnetic resonance and quenching experiment were used to investigate the photocatalytic mechanism, ·OH was regarded as the dominant species for tetracycline oxidation degradation. The effects of tetracycline concentration and catalyst dosage were further studied. Also, the good stability of Cu-doped ZnS was demonstrated via the 5-cycle test.

Under the "Internet +" environment, fresh food operators in Jilin Province are facing new opportunities. The new retail model has obvious advantages in the sale of fresh agricultural products. There are mainly two models of "community store + platform shopping" and "community group buying + centralized pickup." There are still some problems in the community marketing of fresh agricultural products in Jilin Province. The business model can be improved by improving the logistics and distribution system of fresh agricultural products, promoting fresh agricultural products standards, strengthening supervision and management, actively introducing talents, broadening financing channels, and cultivating markets. Improve measures such as guiding the establishment of new consumption habits.

Based on Yang Gail's "people-oriented" public space theory and related research methods, this paper applies pspl research method to Tianlin road street in Xuhui District of Shanghai, investigates and analyzes the spatial scale of street road, the quality of street facade and the flow of people, evaluates the quality of street space, and puts forward some suggestions and ideas.

In order to effectively evaluate the pollution status of available lead (Pb) in farmland environment, a method for the determination of available Pb in greenhouse soil by atomic absorption spectrometry with primary secondary amine (PSA) as solid phase dispersion adsorption material was established. In combination with neutral salt (such as 0.01 mol/L CaCl₂) extraction technology, neutral lead-containing aqueous solution was obtained. Based on the rapid adsorption of Pb in neutral environment and the rapid desorption of Pb under acidic conditions, the pretreatment method of sample enrichment and purification based on PSA was established by optimizing the parameters. The samples after enrichment and purification were determined by atomic absorption spectrometry. Results showed that the linearity of the method was good in the range of 0.010 ∼ 0.050 mg/kg (R² = 0.9990). The limit of detection was 0.0051 mg/kg and the limit of quantity was 0.017 mg/kg. The recoveries were 97.6% to 99.2% and the relative standard deviation was 0.79% ∼ 1.56% at the concentrations of 0.010, 0.030 and 0.050 mg/kg.

With the development of rail transit, subway has become one of the main means of transportation in most cities. However, the particularity and tightness of the subway station, the continuous growth of passenger traffic has also brought some negative environmental problems, such as the comfort and safety of subway station staff and passengers. In this paper, a comprehensive evaluation model of gas environment for metro station is proposed. The micro environment quality evaluation index of metro station is divided into two parts, one is the air quality evaluation index, the other is the thermal comfort evaluation index. From the construction and calculation of these two indexes, the comprehensive evaluation of gas environment of metro station is realized. In order to verify the applicability of the proposed method, we collected the environmental parameter data of six subway stations and evaluated them by using the environmental assessment method. The results show that the proposed method can not only realize the evaluation and monitoring of the station environment, but also has great significance for the improvement and decision-making of public transport environment.

The basic data of the meteorological station network has such problems as inaccuracy, untimely review and inconsistency among operational systems. Aiming to solve these problems, we design an informatization management system for the meteorological station network through the WeChat enterprise. It employs the area verification and the altitude validation based on the digital elevation model, and it performs a regular comparison with the data from the China Integrated Meteorological Information Sharing System. This system realizes the dynamic management for the filling, submitting and reviewing of the station network basic data. It has functions such as intelligent verification of the input data of the station network, efficient and convenient data review, timely reminder message and flexible data service interface. Therefore, the system effectively improves the accuracy of the station network basic data and the review efficiency.

The new media platform based on internet, like WeChat and other mobile phone applications (APPs), can provide meteorological information to users more conveniently and efficiently than the traditional platforms, such as TV, telephone, short message, etc. Therefore, an intranet APP is developed in Inner Mongolia Meteorological Information Center to realize the rapid acquisition of meteorological information in the 70th anniversary celebration of the Inner Mongolia Autonomous Region. Based on user experience and user demands, the APP offers multiple meteorological service products covering meteorological observations and forecasts. It quickly displays the data from the critical regional automatic stations and mobile meteorological stations for relevant users. In this way, it provides seamless, all-round, refined and targeted meteorological services throughout the celebration.

There are errors and deviations in the meteorological data for many reasons. With the increasing scientific requirements for the quality of the meteorological data, the quality control technology of the meteorological data has been explored and developed. The air temperature is one of the routine and important factors in surface meteorological observation with one of the longest observation histories since records began. Therefore, the quality control methods for air temperature data at home and abroad are summarized in this paper. The advantages, disadvantages, and applicability of the methods are analysed.

The novel pyridine-2,6-dicarboxylic acid calcium boric acid hydrate C7H₁₆BCaNO₁₂ was investigated by hydrothermal and its crystal structure was characterized using X-ray diffraction technology. Ca1 atom is eight coordinated by N and seven O atoms from pyridine-2,6-dicarboxylic acid and four H₂O molecular. The hydrogen bonding O-H... O had central effect for crystal stability.

To improve the catalytic efficiency of the microwave single-mode sintering furnace to heat the catalyst and the carrier to catalyse the oxidation of toluene, the SJ-1 microwave single-mode sintering furnace was modified to place a microwave electrodeless ultraviolet lamp in the resonant cavity. The distribution of pollutants in the reactor and the intensity of UV light were calculated by CFD and visualized. The distribution of UV field can be seen from the results of light field, which provides a scientific basis for the placement of catalyst and a reference for the simulation of UV field. Under the conditions of relative humidity of 50%, space velocity of 6336.93 h⁻¹, input power of 392.8 W, bed height of manganese oxide catalyst is 30 mm, initial toluene concentration of 235.23 mg/m³, input power of 595.3 W, toluene conversion efficiency of 94%. It has certain guiding significance.

Manpower, machine, material, law, and environment are the five driving fact ors in a construction project; the joint workforce of real estate owners, project supervis ion, construction management, engineering design and other staff in the process of pro ject implementation imposes itself with a significant characteristics of looseness, due t o different units having their own interest demands. As an organizer, how to lead this " talent-intensive" but loose technical team and promote their proactiveness; how to com plete the project under the premise of low consumption, high quality and high efficienc y, while the individual interests are also met remains a challenge. Therefore, on top of a comprehensive organizational structure, an effective construction management syste m and a strict quality supervision system/measures, team building and the psychologic al satisfaction of the needs of the staff remain key to the achievement of goals. In the p rocess of construction projects, to improve technology efficiency and meet the concept of sustainable development, green construction technology should be enhanced in app lications. On the premise of meeting the requirements of the project, it is essential to e nhance sustainability of the construction work, avoid excessive consumption of materi als, reduce construction costs, and to minimize the impact on the surrounding environ ment. The utilization of green construction technology can effectively achieve environ mental benefits, avoid excessive interference, and eventually improves the effectivenes s and environmental management level of the construction project.

This Research investigates the planting landscape in the environment of Chengxiang District. The method of visual simulation has been used, and questionnaire survey has been conducted to obtain the visual perception identity of respondents on different forms of planting in different environments. With the statistical analysis, we can get the design language of planting that the respondents have a sense of identity. The results show that the combinations of planting species identified in the environment of Chengxiang District, Shanghai, include: local planting species with extensive line branches are easier to get identity in the environment of Old Chengxiang District; cluster planting can better reflect the vitality of business atmosphere at Shikumen; delicate planting texture and bright color can make people have the identity of local Shanghai culture. Based on these design language, this Research tries to integrate it with the urban environment, so as to make the urban planting landscape inherit the urban context spirit and gain a sense of identity in the renovation of small-scale urban landscape.

Based on the big data of electricity consumption in industrial enterprises, this paper uses the DCCA (Detrended cross-correlation analysis) method to study the correlation between electricity consumption and pollutant emission concentration. The BP neural network method is also used to model and predict the pollutant emission trends, in order to monitoring of pollutant emissions in industrial enterprises reasonably. The research results show that there is an obvious correlation between electricity consumption data and pollutant concentration data, and the pollutant emission concentration can be predicted to a certain extent by building a BP neural network model. and the pollutant emission concentration can be predicted to a certain extent by building a BP neural network model. The prediction of pollutants through electricity consumption data helps enterprises to actively respond to the national environmental protection policy and promote national economic development, while allowing more enterprises to enjoy the convenience brought by big data analysis.

Under the "ultra-conventional" control measures of the COVID-19 period, urban population distribution is different from usual time. Studying its evolution laws has a certain reference effect for the judgment of urban population aggregations, the division of precise control zoning, and the differentiated management of places during the COVID-19 control period. Based on the data of Baidu heat maps and points of interest (POIs), this paper uses three models of the population density index (PDI), the exploratory spatial data analysis (ESDA) and the geological detector (Geodetector) to analyze the characteristics and the influencing factors of the evolution of population distribution of Xi'an in three stages which are closed control stage, unsealed control stage and slack control stage. The results show that: in the three stages, 1) The value of the PDI and the range of the PDI change in Xi'an continue to increase. The single-day PDI curve shows "low-high-low" changing characteristics from morning to night in and within the third ring zone, and "high-low-high" in the suburb. And, by comparison, it is found that the social vitality of the first and second ring zone is more strongly impacted because of COVID-19 control measures. 2) The overall population density in Xi'an is gradually increasing, this is represented by gradual increase of the very high- and the high-density areas, and continuous decrease of the low- and the very low-density areas. And the centripetal distribution of population density, which is high inside the city and low outside the city, is becoming more and more obvious. 3) The spatial distribution of population density represents obvious high-value clusters or low-value clusters in the three stages, ESDA shows a circle structure of inner heat and outer cold, and this trend continues to be reinforced. 4) The intensity order of influencing factors of the 7 types of facilities on population distribution is: residential communities > catering facilities > living service facilities > healthy facilities > commercial facilities > office places > green spaces and squares, and the influencing factor intensities show a continuous increasing or a continuous decreasing process in the three stages.

In order to solve the problems of China's new generation Doppler weather radar observation network, such as the lack of mobile monitoring platform, the untimely malfunction alarm and the slow interaction, a mobile operation monitoring system based on WeChat Enterprise has been designed, which is mainly composed of collection, processing, dispersal and feedback of radar's operational status information, and interactive communication between different radar facilities and support personnel. This system can realize weather radar operating status monitoring based on cell phone, hierarchical automatic warning of operating status information, automatic video push of maintenance support activities and interactive feedback and exchange of information among maintenance support personnel, etc. Based on this system, the operational monitoring and technical support capabilities of China's new generation Doppler weather radar are greatly improved, and it plays an important role in promoting the operational efficiency of the weather radar.

Cr³⁺: ZrSiO₄ ceramics with different concentrations of Cr³⁺-doped were prepared by a simple solid-state reaction method, and the effect of Cr³⁺ concentration on the photoluminescence of ZrSiO₄ samples was investigated. The X-ray powder diffractometer (XRD) was used to analyze the structural characteristics of the samples. The XRD results show that zirconium silicate has been completely synthesized at 1400°C, which indicates that Cr³⁺ enters into the lattice of ZrSiO₄, but does not change the structure of it. The emission spectra of ZrSiO₄ were measured by the fluorescence spectrometer. The strongest emission peak was at 689nm, which was attributed by the ²E-⁴A₂ of Cr³⁺. The influence of different concentrations of Cr³⁺ on the luminescence of zirconium silicate was investigated. When the concentration of Cr³⁺ is 0.1mol%, the luminescence intensity of the samples is the highest. When the concentration of Cr³⁺ is 0.5mol%, the intensity of the emission spectrum decreases, which is due to the concentration quenching of Cr³⁺ in the crystal lattice. Finally, the influence of charge compensator ions on the emission intensity of the sample is explored. The results show that the emission intensity of the zirconium silicate samples is improved when the appropriate amount of Li ion is added.

Whether the nature and task of the actual work of environmental sanitation in our country should be changed or adjusted, at present, the coexistence of environmental vehicle science and environmental medicine in our country, how to treat the situation of the coexistence of environmental health work and environmental protection work and how to deal with it correctly in order to facilitate further development and so on. In essence, these problems are the development direction of environmental hygiene and environmental health work in our country. To study the role of public health surveillance in current disease prevention and control. Analyze the literature to clarify the concept, content and specific role of public health surveillance. The main contents of environmental health monitoring are the prevention of sudden accidents, long-term environmental pollution and the detection of environmental hygiene. Through the effective prevention and evaluation of human disease and health, the normal life and health of residents can be guaranteed. Through the development of effective solutions, we can play the role of public health surveillance and improve the effect of disease prevention and control.

Based on CiteSpace, 955 journal literature related to variable oxygen concentration combustion research collected in the web of Science (WOS) core database were analyzed visually. The results show that: 1 Literature publication trends. According to the total number of published literature, it can be divided into three stages: initial development, steady development, and rapid development. 2. Analysis of the author's co-occurrence map. The author's cooperation network in this field is obvious, but the overall cooperation network presents a "core-edge" structure, and the cooperation of academic teams is scattered. 3. Research hotspots, the related research mainly focused on the combustion characteristics of polymer synthetic materials, and chemical cycle combustion related to the field of energy and power engineering. 4. Research on the frontier trend. At present, "mechanical property" and "Nanoparticles" are the keywords representing the latest frontier trend in this field.

In the context of promoting high-quality economic development, it is of great significance to study the relationship between the expansion of urban construction land and carbon emission for the transformation of economic development mode and the implementation of green and low-carbon development. Based on the time series data of Nanchang City from 1995 to 2017, this paper analyzes the relationship between urban construction land expansion and carbon emission by constructing carbon emission measurement model, VAR model, using co integration test, Granger causality test, pulse analysis and other research methods. The results show that there is a co integration relationship between urban construction land expansion and carbon emissions, and Granger causality test shows that urban construction land expansion is the Granger cause of carbon emissions, while impulse response analysis confirms that the impact of urban construction land expansion on carbon emissions at the early stage is not significant, and the subsequent impact increases gradually, and the impact on carbon emissions will reach a stable state when urbanization is mature And put forward policy suggestions.

PM_2.5 is an important component of air pollution, its chemical composition and source are relatively complex, and it stays in the atmosphere for a long time, which has seriously endangered public health, damaged the ecosystem and even affected the climate and environment. Therefore, the prediction of PM_2.5 is of great significance for public health protection and environmental management. One of the reasons why it is difficult to predict PM_2.5 is the interaction between air pollutants, so a method that can not only accurately predict the change of PM_2.5 concentration, but also explain the results is needed. In this paper, different surface meteorological information is used as time series data to predict the hourly PM_2.5 concentration in Wuhan. The prediction can explain the influence of input variables, and use random forest to learn and predict the data. In addition, the meteorological information, air pollutant information and dust value of Zhengzhou City grouped by time series are used as input variables to reflect the air characteristics of North China. This method can learn all the specific time information of the input variables processed by time series in a balanced way, and can also explain the related effects of the input variables. In addition, it also shows that the related variables in North China have an important impact on the generation of PM_2.5 in Wuhan.

With global warming a certainty now, all human activities should adapt the local climate change. It is important to study the characteristics of climate change in Guiyang due to rapid development and little research has been carried out. Supported by meteorological data of 8 weather stations in Guiyang from 1980 to 2017, Mann-Kendall analysis results of the study area for monthly mean temperature and total precipitation show that warming and the alteration of precipitation pattern is appearing with the temporal-spatial heterogeneity. The changing of the precipitation temporal-spatial patterns will indeed increase the risk of drought and flood disasters. The abrupt warming point occurs mainly after 2000, while the abrupt point of precipitation is not significant. The temporal-spatial heterogeneity of climate change is should be considered when implementing the development strategy. Our study can provide a reference for regional climate change research and guidance for making key decisions in the development in the term of environment.

Control the hydroponic conditions of hyacinths with different nutrient solution ratios, select the "Blue Star" variety, and set the CK control group with hyacinth bulbs with uniform bulb sizes for experiment, observe and record the hyacinth root system under different nutrient solution ratios, Bud length, growth vigor and so on. The effects of different nutrient solution ratios on the growth and ornamental quality of the root system and buds of hydroponic hyacinths are preliminarily summarized. The results showed that the nutrient solution treatment would temporarily hinder the growth of the root system, and promote the acceleration of the root system growth after the slow seedling period. The effect of formula B was the most obvious. There was a certain correlation between the growth of buds and the growth of roots. Nutrient solution treatment has good effects in controlling plant lengthening, adjusting crown width, increasing scape diameter, increasing leaf area, and increasing leaf chlorophyll content, but different varieties have different adaptability to different nutrient solution formulas.

The change of planning thought from "taking things as the center" to "taking people as the center" requires that the allocation mode of supporting public service facilities in urban and rural residential areas should also change from simple service radius to accessibility analysis. In this study, Dijkstra algorithm is used to analyze the spatial network with the help of the spatial data of urban transportation network and six types of public service facilities. Based on the concept of equalization of urban and rural public service facilities, this paper constructs an evaluation index system of high-quality living space of urban and rural residents based on accessibility, determines the weight by calculating the information entropy of each index, and compares and analyzes the accessibility evaluation results on the scale of urban and rural residential areas. Try to construct the full coverage and partial coverage of the 15-minute living circle of various facilities under four modes of driving at higher or lower speeds and walking for adults or the elderly. The research results show that the hardware construction of the city's transportation network system and public service facilities is efficient and convenient, with high accessibility and accessibility, showing the characteristics of urban-rural equivalence. However, under the low speed and walking mode, there is still room for layout optimization and improvement of some road systems and facilities.

This article has been retracted by the authors following correspondence with IOP Publishing in which the authors claim the work is unreliable. The author's explanation follows:

"The material of the paper is bacteria, it is not be visible to the naked eyes, the material was contaminated by the drugs that out of date and got polluted, and it caused the serious mistake in the figure 2. The result of different strains of DNA by the primer in 3.3 was not match of our material. The figure 2 was the amplification results of different strains of DNA , and the fragment size of different strains were same in the result, but the result should not be same , so the result was wrong. When we continue to the study, we got new result about the figure 2. There was the amplification results of different strains of DNA by primer TXT in repeated experiment , and the result in the published article was wrong, the material was contaminated. We are afraid that other results were also incorrect in this paper."

IOP Publishing cannot verify this information as accurate, however in the interest of transparency and reproducibility, IOP Publishing agrees to retract this article. This notice will be updated if more information comes to light.

Retraction published: 21 December 2021