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K Seidl et al 2010 J. Micromech. Microeng. 20 105006 Tag this article
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This paper reports on the design, fabrication and characterization of silicon-based microprobes for simultaneous neural recording and drug delivery. The fabrication technology is based on two-stage deep reactive ion etching combined with silicon wafer bonding and grinding to realize channel structures integrated in needle-like probe shafts. Liquids can be supplied to microfluidic devices via in-plane and out-of-plane ports. The liquid is dispensed at circular out-of-plane ports with a diameter of 25 µm and rectangular in-plane ports with dimensions of 50 × 50 µm 2. Two-shaft probes with a pitch between shafts of 1.0 and 1.5 mm were realized. The probe shafts have a length of 8 mm and rectangular cross-sections of w × h ( w = 250 µm and h = 200 or 250 µm). Each shaft contains one or two fluidic channels with a cross-section of 50 × 50 µm 2. In addition, each probe shaft comprises four recording sites with diameters of 20 µm close to the outlet ports. Mechanical and fluidic characterization demonstrated the functionality of the probes. Typical infusion rates of 1.5 µL min −1 are achieved at a differential pressure of 1 kPa. The Pt-gray electrodes have an average electrode impedance of 260 ± 59 kΩ at 1 kHz.
A. Stanislavsky et al 2010 EPL 91 40003 Tag this article
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We derive a general pattern of the nonexponential, two-power-law relaxation from the compound subordination theory of random processes applied to anomalous diffusion. The subordination approach is based on a coupling between the very large jumps in physical and operational times. It allows one to govern a scaling for small and large times independently. Here we obtain explicitly the relaxation function, the kinetic equation and the susceptibility expression applicable to the range of experimentally observed power-law exponents which cannot be interpreted by means of the commonly known Havriliak-Negami fitting function. We present a novel two-power relaxation law for this range in a convenient frequency-domain form and show its relationship to the Havriliak-Negami one.
R. Cassano et al 2010 ApJ 721 L82 Tag this article
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The frequently observed association between giant radio halos (RHs) and merging galaxy clusters has driven present theoretical models of non-thermal emission from galaxy clusters, which are based on the idea that the energy dissipated during cluster-cluster mergers could power the formation of RHs. To quantitatively test the merger-halo connection, we present the first statistical study based on deep radio data and X-ray observations of a complete X-ray-selected sample of galaxy clusters with X-ray luminosity ≥5 × 10 44 erg s –1 and redshift 0.2 ≤ z ≤ 0.32. Using several methods to characterize cluster substructures, namely, the power ratios, centroid shift, and X-ray brightness concentration parameter, we show that clusters with and without RH can be quantitatively differentiated in terms of their dynamical properties. In particular, we confirm that RHs are associated with dynamically disturbed clusters and clusters without RH are more "relaxed," with only a couple of exceptions where a disturbed cluster does not exhibit a halo.
Martin Burger et al 2010 Inverse Problems 26 105012 Tag this article
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In this paper we study some mathematical properties of an inverse problem arising in connection with electrocardiograms (ECGs). More specifically, we analyze the possibility for recovering the transmembrane potential in the heart from ECG recordings, a challenge currently investigated by a growing number of groups. Our approach is based on the bidomain model for the electrical activity in the myocardium, and leads to a parameter identification problem for elliptic partial differential equations (PDEs). It turns out that this challenge can be split into two subproblems:
the task of recovering the potential at the heart surface from body surface recordings;
the problem of computing the transmembrane potential inside the heart from the potential determined at the heart surface.
D. Futterer et al 2010 EPL 91 47004 Tag this article
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We investigate electronic transport in a three-terminal hybrid system, composed by an interacting quantum dot tunnel coupled to one superconducting, one ferromagnetic, and one normal lead. Despite the tendency of the charging energy to suppress the superconducting proximity effect when the quantum dot is in equilibrium, the non-equilibrium proximity effect can give rise to a large Andreev current. The presence of the ferromagnet can lead to a finite spin accumulation on the dot. We find that the interplay of the Andreev current and spin accumulation can generate a pure spin current, with no associated charge transport, in the normal lead. This situation is realised by tuning the quantum-dot spectrum by means of a gate voltage.
E Romanus et al 2003 Nanotechnology 14 1251 Tag this article
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We present a new method for the characterization of magnetic nanoparticles based on the analysis of the dependence of the Néel relaxation signal on the sample temperature. In contrast to the established characterization methods, the new method directly delivers the energy barrier distribution of the magnetic system (in the case of ferrofluid particles or their aggregates). A water based ferrofluid consisting of magnetic nanoparticles with an iron oxide core and a shell of carboxydextran has been magnetically fractionated and immobilized and the fractions have been investigated in a temperature range from 77 to 350 K. The influence of the fractionation process on the distribution of the energy barriers of the particle system has been studied qualitatively.
T Accadia et al 2010 J. Phys.: Conf. Ser. 228 012015 Tag this article
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Virgo is a kilometer-length interferometer for gravitationnal waves detection located near Pisa. Its first science run, VSR1, occured from May to October 2007. The aims of the calibration are to measure the detector sensitivity and to reconstruct the time series of the gravitationnal wave strain h( t).
The absolute length calibration is based on an original non-linear reconstruction of the differential arm length variations in free swinging Michelson configurations. It uses the laser wavelength as length standard. This method is used to calibrate the frequency dependent response of the Virgo mirror actuators and derive the detector in-loop response and sensitivity within ~ 5%.
The principle of the strain reconstruction is highlighted and the h( t) systematic errors are estimated. A photon calibrator is used to check the sign of h( t). The reconstructed h( t) during VSR1 is valid from 10 Hz up to 10 kHz with systematic errors estimated to 6% in amplitude. The phase error is estimated to be 70 mrad below 1.9 kHz and 6 μs above.
Edward N. Taylor et al 2010 ApJ 720 723 Tag this article
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We set out to test the claim that the recently identified
population of compact, massive, and quiescent galaxies at
z ~ 2.3 must undergo significant size evolution to match the
properties of galaxies found in the local universe. Using data from
the Sloan Digital Sky Survey (SDSS; Data Release 7), we have
conducted a search for local red sequence galaxies with sizes and
masses comparable to those found at
z ~ 2.3. The SDSS spectroscopic target selection algorithm
excludes high surface brightness objects; we show that this makes
incompleteness a concern for such massive, compact galaxies,
particularly for
low redshifts (
z
0.05). We have
identified 63
M
*>10
10.7
M
(
5 × 10
10
M
) red sequence galaxies at 0.066 <
z
spec < 0.12 which are smaller than the median
size-mass relation by a factor of 2 or more. Consistent with
expectations from the virial theorem, the median offset from the
mass-velocity dispersion relation for these galaxies is
0.12 dex. We do not, however, find any galaxies with sizes and
masses comparable to those observed at
z ~ 2.3, implying a decrease in the comoving number density
of these galaxies, at fixed size and mass, by a factor of
5000. This
result cannot be explained by incompleteness: in the 0.066 <
z < 0.12 interval, we estimate that the SDSS
spectroscopic sample should typically be
75% complete for
galaxies with the sizes and masses seen at high redshift, although
for the very smallest galaxies it may be as low as ~20%. In order
to confirm that the absence of such compact massive galaxies in
SDSS is not produced by spectroscopic selection effects, we have
also looked for such galaxies in the basic SDSS photometric
catalog, using photometric redshifts. While we do find signs of a
slight bias against massive, compact galaxies, this analysis
suggests that the SDSS spectroscopic sample is missing at most a
few objects in the regime we consider. Accepting the high-redshift
results, it is clear that massive galaxies must undergo significant
structural evolution over
z
2 in order to
match the population seen in the local universe. Our results
suggest that a highly stochastic mechanism (e.g., major mergers)
cannot be the primary driver of this strong size evolution.
G T Gullberg et al 1987 Phys. Med. Biol. 32 1581 Tag this article
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Tomographic image quality depends on precisely determining the geometric parameters that reference the detector system to the transaxial imaging coordinate system. In addition to the projection of the centre of rotation onto the detector, fan beam geometry requires two other parameters that include the focal length and the projection of the focal point onto the detector. Heretofore no method has been developed for estimating the geometrical parameters of a fan beam detector system. A method is presented for estimating these parameters from centroids of the measured projections of a point source using the non-linear estimation algorithm due to Marquardt. The technique is applied to single photon emission computed tomography (SPECT) data from a rotating gamma camera using a fan beam collimator. The parameters can be determined very quickly in a clinical environment. The corresponding reconstructed images do not show image artefacts or loss of resolution characteristic of inaccurately determined geometric parameters.
O Gilad et al 2009 Physiol. Meas. 30 S201 Tag this article
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Electrical impedance tomography (EIT) has the potential to achieve non-invasive functional imaging of fast neuronal activity in the human brain due to opening of ion channels during neuronal depolarization. Local changes of resistance in the cerebral cortex are about 1%, but the size and location of changes recorded on the scalp are unknown. The purpose of this work was to develop an anatomically realistic finite element model of the adult human head and use it to predict the amplitude and topography of changes on the scalp, and so inform specification for an in vivo measuring system. A detailed anatomically realistic finite element (FE) model of the head was produced from high resolution MRI. Simulations were performed for impedance changes in the visual cortex during evoked activity with recording of scalp potentials by electrodes or magnetic flux density by magnetoencephalography (MEG) in response to current injected with electrodes. The predicted changes were validated by recordings in saline filled tanks and with boundary voltages measured on the human scalp. Peak changes were 1.03 ± 0.75 µV (0.0039 ± 0.0034%) and 27 ± 13 fT (0.2 ± 0.5%) respectively, which yielded an estimated peak signal-to-noise ratio of about 4 for in vivo averaging over 10 min and 1 mA current injection. The largest scalp changes were over the occipital cortex. This modelling suggests, for the first time, that reproducible changes could be recorded on the scalp in vivo in single channels, although a higher SNR would be desirable for accurate image production. The findings suggest that an in vivo study is warranted in order to determine signal size but methods to improve SNR, such as prolonged averaging or other signal processing may be needed for accurate image production.
S Ramelow et al 2010 New J. Phys. 12 083027 Tag this article
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In the circuit model, quantum computers rely on the availability of a universal quantum gate set. A particularly intriguing example is a set of two-qubit-only gates: 'matchgates', along with swap (the exchange of two qubits). In this paper, we show a simple decomposition of arbitrary matchgates into better-known elementary gates and implement a matchgate in a single-photon linear optics experiment. The gate performance is fully characterized via quantum process tomography. Moreover, we represent the resulting reconstructed quantum process in a novel way, as a fidelity map in the space of all possible non-local two-qubit unitaries. We propose the non-local distance—which is independent of local imperfections such as uncorrelated noise or uncompensated local rotations—as a new diagnostic process measure for the non-local properties of the implemented gate.
Predrag Cvitanovic and A D Kennedy 1982 Phys. Scr. 26 5 Tag this article
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We study the properties of spinors in
n dimensions and the consequences of taking Dirac matrices
to be Grassmann valued. We find that this yields representations of
the sympletic group in
n dimensions, which can be interpreted as representations of
the orthogonal group in -
n dimensions. In particular we find the sympletic analogues
of spinorial representations. We also prove that the relation Sp (
n)
SO (-
n) holds in general.
G Stepanov et al 2009 J. Phys.: Conf. Ser. 149 012098 Tag this article
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The magnetorheological effect of elastomer composites containing a mixture of large (50-80 μm) and small (3-5 μm) particles has been experimentally examined. The data shows that elasticity in the range of small deformations (1%) for a magnetic field strength of 290 mT increased by two order of magnitude. This effect can be explained with the presence of the large particles in the structure of the composite assisting the aggregation effect. Due to the strong increase of the interparticle interaction compared with the restoring elastic forces, the presence of the large particles leads to the observed steep increase of Young's modulus.
Yang Chen et al 2008 ApJ 676 1040 Tag this article
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We present a spatially resolved spectroscopic study of the thermal composite supernova remnant Kes 27 with Chandra. The X-ray spectrum of Kes 27 is characterized by K lines from Mg, Si, S, Ar, and Ca. The X-ray-emitting gas is found to be enriched in sulfur and calcium. The broadband and tricolor images show two incomplete shell-like features in the northeastern half and brightness fading with increasing radius to the southwest. There are over 30 unresolved sources within the remnant. None shows characteristics typical of a young neutron star. The maximum diffuse X-ray intensity coincides with a radio-bright region along the eastern border. In general, gas in the inner region is at higher temperature, and the emission is brighter, than that in the outer region. The gas in the remnant appears to be near ionization equilibrium. The overall morphology can be explained by the evolution of the remnant in an ambient medium with a density enhancement from west to east. We suggest that the remnant was born in a preexisting cavity and that the bright inner emission is due to the reflection of the initial shock from the dense cavity wall. This scenario may provide a new candidate mechanism to explain the X-ray morphology of other thermal composite supernova remnants.J Y Tsao et al 2010 J. Phys. D: Appl. Phys. 43 354001 Tag this article
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Artificial light has long been a significant factor contributing to the quality and productivity of human life. As a consequence, we are willing to use huge amounts of energy to produce it. Solid-state lighting (SSL) is an emerging technology that promises performance features and efficiencies well beyond those of traditional artificial lighting, accompanied by potentially massive shifts in (a) the consumption of light, (b) the human productivity and energy use associated with that consumption and (c) the semiconductor chip area inventory and turnover required to support that consumption. In this paper, we provide estimates of the baseline magnitudes of these shifts using simple extrapolations of past behaviour into the future. For past behaviour, we use recent studies of historical and contemporary consumption patterns analysed within a simple energy-economics framework (a Cobb–Douglas production function and profit maximization). For extrapolations into the future, we use recent reviews of believed-achievable long-term performance targets for SSL. We also discuss ways in which the actual magnitudes could differ from the baseline magnitudes of these shifts. These include: changes in human societal demand for light; possible demand for features beyond lumens; and guidelines and regulations aimed at economizing on consumption of light and associated energy.
E. Komatsu et al 2009 ApJS 180 330 Tag this article
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The
Wilkinson Microwave Anisotropy Probe (
WMAP) 5-year data provide stringent limits on deviations
from the minimal, six-parameter Λ cold dark matter
model. We report these limits and use them to constrain the physics
of cosmic inflation via Gaussianity, adiabaticity, the power
spectrum of primordial fluctuations, gravitational waves, and
spatial curvature. We also constrain models of dark energy via its
equation of state, parity-violating interaction, and neutrino
properties, such as mass and the number of species. We detect no
convincing deviations from the minimal model. The six parameters
and the corresponding 68% uncertainties, derived from the
WMAP data combined with the distance measurements from the
Type Ia supernovae (SN) and the Baryon Acoustic Oscillations (BAO)
in the distribution of galaxies, are: Ω
b
h
2 = 0.02267
+0.00058
–0.00059, Ω
c
h
2 = 0.1131 ± 0.0034, Ω
Λ = 0.726 ± 0.015,
n
s = 0.960 ± 0.013, τ = 0.084 ±
0.016, and
at
k = 0.002 Mpc
-1. From these, we derive σ
8 = 0.812 ± 0.026,
H
0 = 70.5 ± 1.3 km s
-1 Mpc
–1, Ω
b = 0.0456 ± 0.0015, Ω
c = 0.228 ± 0.013, Ω
m
h
2 = 0.1358
+0.0037
–0.0036,
z
reion = 10.9 ± 1.4, and
t
0 = 13.72 ± 0.12 Gyr. With the
WMAP data combined with BAO and SN, we find the limit on the
tensor-to-scalar ratio of
r < 0.22(95%CL), and that
n
s > 1 is disfavored even when gravitational waves
are included, which constrains the models of inflation that can
produce significant gravitational waves, such as chaotic or
power-law inflation models, or a blue spectrum, such as hybrid
inflation models. We obtain tight, simultaneous limits on the
(constant) equation of state of dark energy and the spatial
curvature of the universe: –0.14 < 1 +
w < 0.12(95%CL) and –0.0179 < Ω
k < 0.0081(95%CL). We provide a set of "
WMAP distance priors," to test a variety of dark energy
models with spatial curvature. We test a time-dependent
w with a present value constrained as –0.33 < 1 +
w
0 < 0.21 (95% CL). Temperature and dark matter
fluctuations are found to obey the adiabatic relation to within
8.9% and 2.1% for the axion-type and curvaton-type dark matter,
respectively. The power spectra of TB and EB correlations constrain
a parity-violating interaction, which rotates the polarization
angle and converts E to B. The polarization angle could not be
rotated more than –5
9 <
Δα < 2
4 (95% CL)
between the decoupling and the present epoch. We find the limit on
the total mass of massive neutrinos of ∑
m
ν < 0.67 eV(95%CL), which is free from the
uncertainty in the normalization of the large-scale structure data.
The number of relativistic degrees of freedom (dof), expressed in
units of the effective number of neutrino species, is constrained
as
N
eff = 4.4 ± 1.5 (68%), consistent with the
standard value of 3.04. Finally, quantitative limits on
physically-motivated primordial non-Gaussianity parameters are
–9 <
f
local
NL < 111 (95% CL) and –151 <
f
equil
NL < 253 (95% CL) for the local and equilateral
models, respectively.
J. Dunkley et al 2009 ApJS 180 306 Tag this article
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This paper focuses on cosmological constraints derived from analysis of WMAP data alone. A simple ΛCDM cosmological model fits the five-year WMAP temperature and polarization data. The basic parameters of the model are consistent with the three-year data and now better constrained: Ω b h 2 = 0.02273 ± 0.00062, Ω c h 2 = 0.1099 ± 0.0062, Ω Λ = 0.742 ± 0.030, n s = 0.963 +0.014 –0.015, τ = 0.087 ± 0.017, and σ 8 = 0.796 ± 0.036, with h = 0.719 +0.026 –0.027. With five years of polarization data, we have measured the optical depth to reionization, τ>0, at 5σ significance. The redshift of an instantaneous reionization is constrained to be z reion = 11.0 ± 1.4 with 68% confidence. The 2σ lower limit is z reion > 8.2, and the 3σ limit is z reion > 6.7. This excludes a sudden reionization of the universe at z = 6 at more than 3.5σ significance, suggesting that reionization was an extended process. Using two methods for polarized foreground cleaning we get consistent estimates for the optical depth, indicating an error due to the foreground treatment of τ ~ 0.01. This cosmological model also fits small-scale cosmic microwave background (CMB) data, and a range of astronomical data measuring the expansion rate and clustering of matter in the universe. We find evidence for the first time in the CMB power spectrum for a nonzero cosmic neutrino background, or a background of relativistic species, with the standard three light neutrino species preferred over the best-fit ΛCDM model with N eff = 0 at >99.5% confidence, and N eff > 2.3(95%confidence limit (CL)) when varied. The five-year WMAP data improve the upper limit on the tensor-to-scalar ratio, r < 0.43(95%CL), for power-law models, and halve the limit on r for models with a running index, r < 0.58(95%CL). With longer integration we find no evidence for a running spectral index, with dn s / dln k = –0.037 ± 0.028, and find improved limits on isocurvature fluctuations. The current WMAP-only limit on the sum of the neutrino masses is ∑ m ν < 1.3 eV(95%CL), which is robust, to within 10%, to a varying tensor amplitude, running spectral index, or dark energy equation of state.
G. Hinshaw et al 2009 ApJS 180 225 Tag this article
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We present new full-sky temperature and polarization maps in
five frequency bands from 23 to 94 GHz, based on data from the
first five years of the
Wilkinson Microwave Anisotropy Probe (
WMAP) sky survey. The new maps are consistent with previous
maps and are more sensitive. The five-year maps incorporate several
improvements in data processing made possible by the additional
years of data and by a more complete analysis of the instrument
calibration and in-flight beam response. We present several new
tests for systematic errors in the polarization data and conclude
that W-band polarization data is not yet suitable for cosmological
studies, but we suggest directions for further study. We
do find that Ka-band data is suitable for use; in
conjunction with the additional years of data, the addition of Ka
band to the previously used Q- and V-band channels significantly
reduces the uncertainty in the optical depth parameter, τ.
Further scientific results from the five-year data analysis are
presented in six companion papers and are summarized in Section 7
of this paper. With the five-year
WMAP data, we detect no convincing deviations from the
minimal six-parameter ΛCDM model: a flat universe dominated
by a cosmological constant, with adiabatic and nearly
scale-invariant Gaussian fluctuations. Using
WMAP data combined with measurements of Type Ia supernovae
and Baryon Acoustic Oscillations in the galaxy distribution, we
find (68% CL uncertainties): Ω
b
h
2 = 0.02267
+0.00058
–0.00059, Ω
c
h
2 = 0.1131 ± 0.0034, Ω
Λ = 0.726 ± 0.015,
n
s = 0.960 ± 0.013, τ = 0.084 ±
0.016, and
at
k = 0.002 Mpc
-1. From these we derive σ
8 = 0.812 ± 0.026,
H
0 = 70.5 ± 1.3 km s
-1 Mpc
–1, Ω
b = 0.0456 ± 0.0015, Ω
c = 0.228 ± 0.013, Ω
m
h
2 = 0.1358
+0.0037
–0.0036,
z
reion = 10.9 ± 1.4, and
t
0 = 13.72 ± 0.12 Gyr. The new limit on the
tensor-to-scalar ratio is
r < 0.22(95%CL), while the evidence for a running
spectral index is insignificant,
dn
s /
dln
k = –0.028 ± 0.020 (68% CL). We obtain tight,
simultaneous limits on the (constant) dark energy equation of state
and the spatial curvature of the universe: –0.14 < 1 +
w < 0.12(95%CL) and –0.0179 < Ω
k < 0.0081(95%CL). The number of relativistic
degrees of freedom, expressed in units of the effective number of
neutrino species, is found to be
N
eff = 4.4 ± 1.5 (68% CL), consistent with the
standard value of 3.04. Models with
N
eff = 0 are disfavored at >99.5% confidence. Finally,
new limits on physically motivated primordial non-Gaussianity
parameters are –9 <
f
local
NL < 111 (95% CL) and –151 <
f
equil
NL < 253 (95% CL) for the local and equilateral
models, respectively.
Ofer Aharony et al JHEP10(2008)091 Tag this article
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We construct three dimensional Chern-Simons-matter theories with gauge groups U( N) × U( N) and SU( N) × SU( N) which have explicitKevork N. Abazajian et al 2009 ApJS 182 543 Tag this article
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This paper describes the Seventh Data Release of the Sloan
Digital Sky Survey (SDSS), marking the completion of the original
goals of the SDSS and the end of the phase known as SDSS-II. It
includes 11,663 deg
2 of imaging data, with most of the ~2000 deg
2 increment over the previous data release lying in
regions of low Galactic latitude. The catalog contains five-band
photometry for 357 million distinct objects. The survey also
includes repeat photometry on a 120° long, 2
5 wide stripe
along the celestial equator in the Southern Galactic Cap, with some
regions covered by as many as 90 individual imaging runs. We
include a co-addition of the best of these data, going roughly
2 mag fainter than the main survey over 250 deg
2. The survey has completed spectroscopy over
9380 deg
2; the spectroscopy is now complete over a large
contiguous area of the Northern Galactic Cap, closing the gap that
was present in previous data releases. There are over
1.6 million spectra in total, including 930,000 galaxies,
120,000 quasars, and 460,000 stars. The data release
includes improved stellar photometry at low Galactic latitude. The
astrometry has all been recalibrated with the second version of the
USNO CCD Astrograph Catalog, reducing the rms statistical errors at
the bright end to 45 milliarcseconds per coordinate. We
further quantify a systematic error in bright galaxy photometry due
to poor sky determination; this problem is less severe than
previously reported for the majority of galaxies. Finally, we
describe a series of improvements to the spectroscopic reductions,
including better flat fielding and improved wavelength calibration
at the blue end, better processing of objects with extremely strong
narrow emission lines, and an improved determination of stellar
metallicities.
W. B. Atwood et al 2009 ApJ 697 1071 Tag this article
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The Large Area Telescope ( Fermi/LAT, hereafter LAT), the primary instrument on the Fermi Gamma-ray Space Telescope ( Fermi) mission, is an imaging, wide field-of-view (FoV), high-energy γ-ray telescope, covering the energy range from below 20 MeV to more than 300 GeV. The LAT was built by an international collaboration with contributions from space agencies, high-energy particle physics institutes, and universities in France, Italy, Japan, Sweden, and the United States. This paper describes the LAT, its preflight expected performance, and summarizes the key science objectives that will be addressed. On-orbit performance will be presented in detail in a subsequent paper. The LAT is a pair-conversion telescope with a precision tracker and calorimeter, each consisting of a 4 × 4 array of 16 modules, a segmented anticoincidence detector that covers the tracker array, and a programmable trigger and data acquisition system. Each tracker module has a vertical stack of 18 ( x, y) tracking planes, including two layers ( x and y) of single-sided silicon strip detectors and high- Z converter material (tungsten) per tray. Every calorimeter module has 96 CsI(Tl) crystals, arranged in an eight-layer hodoscopic configuration with a total depth of 8.6 radiation lengths, giving both longitudinal and transverse information about the energy deposition pattern. The calorimeter's depth and segmentation enable the high-energy reach of the LAT and contribute significantly to background rejection. The aspect ratio of the tracker (height/width) is 0.4, allowing a large FoV (2.4 sr) and ensuring that most pair-conversion showers initiated in the tracker will pass into the calorimeter for energy measurement. Data obtained with the LAT are intended to (1) permit rapid notification of high-energy γ-ray bursts and transients and facilitate monitoring of variable sources, (2) yield an extensive catalog of several thousand high-energy sources obtained from an all-sky survey, (3) measure spectra from 20 MeV to more than 50 GeV for several hundred sources, (4) localize point sources to 0.3-2 arcmin, (5) map and obtain spectra of extended sources such as SNRs, molecular clouds, and nearby galaxies, (6) measure the diffuse isotropic γ-ray background up to TeV energies, and (7) explore the discovery space for dark matter.
Paolo Giannozzi et al 2009 J. Phys.: Condens. Matter 21 395502 Tag this article
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QUANTUM ESPRESSO is an integrated suite of computer codes for electronic-structure calculations and materials modeling, based on density-functional theory, plane waves, and pseudopotentials (norm-conserving, ultrasoft, and projector-augmented wave). The acronym ESPRESSO stands for opEn Source Package for Research in Electronic Structure, Simulation, and Optimization. It is freely available to researchers around the world under the terms of the GNU General Public License. QUANTUM ESPRESSO builds upon newly-restructured electronic-structure codes that have been developed and tested by some of the original authors of novel electronic-structure algorithms and applied in the last twenty years by some of the leading materials modeling groups worldwide. Innovation and efficiency are still its main focus, with special attention paid to massively parallel architectures, and a great effort being devoted to user friendliness. QUANTUM ESPRESSO is evolving towards a distribution of independent and interoperable codes in the spirit of an open-source project, where researchers active in the field of electronic-structure calculations are encouraged to participate in the project by contributing their own codes or by implementing their own ideas into existing codes.
Thomas Schwetz et al 2008 New J. Phys. 10 113011 Tag this article
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We review the present status of three-flavour neutrino oscillations, taking into account the latest available neutrino oscillation data presented at the Neutrino 2008 Conference. This includes the data released this summer by the MINOS collaboration, the data of the neutral current counter phase of the Sudbury Neutrino Observatory (SNO) solar neutrino experiment, as well as the latest KamLAND and Borexino data. We give the updated determinations of the leading 'solar' and 'atmospheric' oscillation parameters. We find from global data that the mixing angle θ 13 is consistent with zero within 0.9σ and we derive an upper bound of sin 2θ 13≤0.035 (0.056) at 90% confidence level (CL) (3σ).
M. R. Nolta et al 2009 ApJS 180 296 Tag this article
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We present the temperature and polarization angular power
spectra of the cosmic microwave background derived from the first
five years of
Wilkinson Microwave Anisotropy Probe data. The five-year
temperature spectrum is cosmic variance limited up to multipole
= 530, and
individual
-modes have
signal-to-noise ratio S/N >1 for
< 920. The
best-fitting six-parameter ΛCDM model has a reduced χ
2 for
= 33-1000 of
χ
2/ν = 1.06, with a probability to exceed of 9.3%.
There is now significantly improved data near the third peak which
leads to improved cosmological constraints. The
temperature-polarization correlation is seen with high
significance. After accounting for foreground emission, the low-
reionization
feature in the EE power spectrum is preferred by Δχ
2 = 19.6 for optical depth τ = 0.089 by the EE data
alone, and is now largely cosmic variance limited for
= 2-6. There is
no evidence for cosmic signal in the BB, TB, or EB spectra after
accounting for foreground emission. We find that, when averaged
over
= 2-6,
(
+ 1)
C
BB
/(2π) < 0.15 μK
2 (95% CL).
Dan Hooper et al JCAP01(2009)025 Tag this article