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Статті в журналах з теми "Sample Degeneracy"

Автор: Grafiati

Опубліковано: 10 березня 2023

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1

Lewenstein, Maciej, J. Ignacio Cirac, and Luis Santos. "Cooling of a small sample of Bose atoms with accidental degeneracy." Journal of Physics B: Atomic, Molecular and Optical Physics 33, no. 19 (2000): 4107–29. http://dx.doi.org/10.1088/0953-4075/33/19/321.

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2

Tonn, Babette, Jacques Lacaze, and Stephanie Duwe. "Degenerated Graphite Growth in Ductile Iron." Materials Science Forum 925 (June 2018): 62–69. http://dx.doi.org/10.4028/www.scientific.net/msf.925.62.

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As part of a study devoted to the effect of trace elements on graphite degeneracy, near-eutectic ductile iron melts were prepared to which minute amounts of lead and of both lead and cerium were added. The melts were cast into an insulated Y4 mould, giving a solidification time of about 1 hour and a cooling time to room temperature of about 15 hours. In the thermal centre of the Pb containing sample graphite spheroids as well as intergranular lamellar graphite have been found. At the same location of the casting containing both Pb and Ce, exploded as well as chunky graphite could be observed,

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3

Perenon, L., S. Ilić, R. Maartens, and A. de la Cruz-Dombriz. "Improvements in cosmological constraints from breaking growth degeneracy." Astronomy & Astrophysics 642 (October 2020): A116. http://dx.doi.org/10.1051/0004-6361/202038409.

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Context. The key probes of the growth of a large-scale structure are its rate f and amplitude σ8. Redshift space distortions in the galaxy power spectrum allow us to measure only the combination fσ8, which can be used to constrain the standard cosmological model or alternatives. By using measurements of the galaxy-galaxy lensing cross-correlation spectrum or of the galaxy bispectrum, it is possible to break the fσ8 degeneracy and obtain separate estimates of f and σ8 from the same galaxy sample. Currently there are very few such separate measurements, but even this allows for improved constrai

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4

Sonnenfeld, Alessandro. "Statistical strong lensing." Astronomy & Astrophysics 656 (December 2021): A153. http://dx.doi.org/10.1051/0004-6361/202142062.

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Context. Time-delay lensing is a powerful tool for measuring the Hubble constant H0. However, in order to obtain an accurate estimate of H0 from a sample of time-delay lenses, very good knowledge of the mass structure of the lens galaxies is needed. Strong lensing data on their own are not sufficient to break the degeneracy between H0 and the lens model parameters on a single object basis. Aims. The goal of this study is to determine whether it is possible to break the H0-lens structure degeneracy with the statistical combination of a large sample of time-delay lenses, relying purely on strong

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5

Molenberghs, Geert, Michael G. Kenward, Marc Aerts, et al. "On random sample size, ignorability, ancillarity, completeness, separability, and degeneracy: Sequential trials, random sample sizes, and missing data." Statistical Methods in Medical Research 23, no. 1 (2012): 11–41. http://dx.doi.org/10.1177/0962280212445801.

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6

Li, Tiancheng, Shudong Sun, Tariq Pervez Sattar, and Juan Manuel Corchado. "Fight sample degeneracy and impoverishment in particle filters: A review of intelligent approaches." Expert Systems with Applications 41, no. 8 (2014): 3944–54. http://dx.doi.org/10.1016/j.eswa.2013.12.031.

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7

Ravel, Bruce. "Path degeneracy and EXAFS analysis of disordered materials." Journal of Synchrotron Radiation 21, no. 6 (2014): 1269–74. http://dx.doi.org/10.1107/s1600577514014982.

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Analysis of EXAFS data measured on a material with a disordered local configuration environment around the absorbing atom can be challenging owing to the proliferation of photoelectron scattering paths that must be considered in the analysis. In the case where the absorbing atom exists in multiple inequivalent sites, the problem is compounded by having to consider each site separately. A method is proposed for automating the calculation of theory for inequivalent sites, then averaging the contributions from sufficiently similar scattering paths. With this approach, the complexity of implementi

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8

Andreon, S., G. Trinchieri, and A. Moretti. "Low X-ray surface brightness clusters: implications on the scatter of the M–T and L–T relations." Monthly Notices of the Royal Astronomical Society 511, no. 4 (2022): 4991–98. http://dx.doi.org/10.1093/mnras/stac307.

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ABSTRACT We aim at studying scaling relations of a small but well-defined sample of galaxy clusters that includes the recently discovered class of objects that are X-ray faint for their mass. These clusters have an average low X-ray surface brightness, a low gas fraction, and are underrepresented (by a factor of 10) in X-ray surveys or entirely absent in Sunyaev-Zeldovich (SZ) surveys. With the inclusion of these objects, we find that the temperature–mass relation has an unprecedentedly large scatter, 0.20 ± 0.03 dex at fixed mass, as wide as allowed by the temperature range, and the location

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9

Repp, Andrew, та István Szapudi. "Galaxy bias and σ8 from counts in cells from the SDSS main sample". Monthly Notices of the Royal Astronomical Society: Letters 498, № 1 (2020): L125—L129. http://dx.doi.org/10.1093/mnrasl/slaa139.

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ABSTRACT The counts-in-cells (CIC) galaxy probability distribution depends on both the dark matter clustering amplitude σ8 and the galaxy bias b. We present a theory for the CIC distribution based on a previous prescription of the underlying dark matter distribution and a linear volume transformation to redshift space. We show that, unlike the power spectrum, the CIC distribution breaks the degeneracy between σ8 and b on scales large enough that both bias and redshift distortions are still linear; thus, we obtain a simultaneous fit for both parameters. We first validate the technique on the Mi

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10

Kallend, John S., R. B. Schwarz, and A. D. Rollett. "Resolution of Superimposed Diffraction Peaks in Texture Analysis of a YBa2Cu3O7 Polycrystal." Textures and Microstructures 13, no. 2-3 (1991): 189–97. http://dx.doi.org/10.1155/tsm.13.189.

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Texture measurements in polycrystalline 123 oxide superconductors are complicated by the superposition of Bragg reflections in the pole figures due to the near degeneracy of the crystal structure. A method is described, based on an extension of the WIMV algorithm, for resolving these superpositions and determining the crystal orientation distribution (OD). The method is exemplified by OD analysis of a magnetically aligned, strongly textured powder sample of YBa2Cu3O7.

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11

Palmerio, J. T., and F. Daigne. "Constraining the intrinsic population of long gamma-ray bursts: Implications for spectral correlations, cosmic evolution, and their use as tracers of star formation." Astronomy & Astrophysics 649 (May 2021): A166. http://dx.doi.org/10.1051/0004-6361/202039929.

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Aims. Long gamma-ray bursts (LGRBs) have been shown to be powerful probes of the Universe, in particular for studying the star formation rate up to very high redshift (z ∼ 9). Since LGRBs are produced by only a small fraction of massive stars, it is paramount to have a good understanding of their underlying intrinsic population in order to use them as cosmological probes without introducing any unwanted bias. The goal of this work is to constrain and characterise this intrinsic population. Methods. We developed a Monte Carlo model where each burst is described by its redshift and its propertie

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12

Escamilla-Rivera, Celia, Geovanny Rave-Franco, and Jackson Levi-Said. "f(T, B) Cosmography for High Redshifts." Universe 7, no. 11 (2021): 441. http://dx.doi.org/10.3390/universe7110441.

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In light of the statistical performance of cosmological observations, in this work we present the cosmography in f(T,B) gravity. In this scenario we found a cosmological viable standard case that allows the reduction of the degeneracy between several f(T,B) models already proposed in the literature. Furthermore, we constrain this model using Pantheon SNeIa compilation, cosmic chronometers and a newly GRB calibrated data sample. We found that with an appropriate strategy for including the cosmographic parameter, we do produce a viable cosmology with our model within f(T,B) gravity.

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13

DIVAKARAN, P. P., and A. K. RAJAGOPAL. "QUANTUM THEORY OF LANDAU AND PEIERLS ELECTRONS FROM THE CENTRAL EXTENSIONS OF THEIR SYMMETRY GROUPS." International Journal of Modern Physics B 09, no. 03 (1995): 261–94. http://dx.doi.org/10.1142/s0217979295000136.

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By Wigner’s theorem on symmetries, the total state space of a quantum system whose symmetries form the group G is the collection of all projective unitary representations of G; these are, in turn, realised as certain unitary representations of the set of all central extensions of G by U(1). Exploiting this relationship, we present in this paper a new approach to the quantum mechanics of an electron in a uniform magnetic field B, in the plane (the Landau electron) and on the 2-torus in the presence of a periodic potential V whose periodicity is that of an N×N lattice (the Peierls electron). For

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14

Lee, S., E. M. Huff, A. Choi, et al. "Probing gravity with the DES-CMASS sample and BOSS spectroscopy." Monthly Notices of the Royal Astronomical Society 509, no. 4 (2021): 4982–96. http://dx.doi.org/10.1093/mnras/stab3129.

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ABSTRACT The DES-CMASS sample (DMASS) is designed to optimally combine the weak lensing measurements from the Dark Energy Survey (DES) and redshift-space distortions (RSD) probed by the CMASS galaxy sample from the Baryonic Oscillation Spectroscopic Survey. In this paper, we demonstrate the feasibility of adopting DMASS as the equivalent of CMASS for a joint analysis of DES and BOSS in the framework of modified gravity. We utilize the angular clustering of the DMASS galaxies, cosmic shear of the DES metacalibration sources, and cross-correlation of the two as data vectors. By jointly fitting t

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15

Qin, Jianbo, Xian Zhong Zheng, Min Fang, et al. "Systematic biases in determining dust attenuation curves through galaxy SED fitting." Monthly Notices of the Royal Astronomical Society 511, no. 1 (2022): 765–83. http://dx.doi.org/10.1093/mnras/stac132.

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ABSTRACT While the slope of the dust attenuation curve (δ) is found to correlate with effective dust attenuation (AV) as obtained through spectral energy distribution (SED) fitting, it remains unknown how the fitting degeneracies shape this relation. We examine the degeneracy effects by fitting SEDs of a sample of local star-forming galaxies (SFGs) selected from the Galaxy And Mass Assembly survey, in conjunction with mock galaxy SEDs of known attenuation parameters. A well-designed declining starburst star formation history is adopted to generate model SED templates with intrinsic UV slope (β

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16

Enzi, Wolfgang, Simona Vegetti, Giulia Despali, Jen-Wei Hsueh, and R. Benton Metcalf. "Systematic errors in strong gravitational lensing reconstructions, a numerical simulation perspective." Monthly Notices of the Royal Astronomical Society 496, no. 2 (2020): 1718–29. http://dx.doi.org/10.1093/mnras/staa1224.

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ABSTRACT We present the analysis of a sample of 24 SLACS-like galaxy–galaxy strong gravitational lens systems with a background source and deflectors from the Illustris-1 simulation. We study the degeneracy between the complex mass distribution of the lenses, substructures, the surface brightness distribution of the sources, and the time delays. Using a novel inference framework based on Approximate Bayesian Computation, we find that for all the considered lens systems, an elliptical and cored power-law mass density distribution provides a good fit to the data. However, the presence of cores i

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17

Kaplan, Andee, Daniel J. Nordman, and Stephen B. Vardeman. "On the S-instability and degeneracy of discrete deep learning models." Information and Inference: A Journal of the IMA 9, no. 3 (2019): 627–55. http://dx.doi.org/10.1093/imaiai/iaz022.

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Abstract A probability model exhibits instability if small changes in a data outcome result in large and, often unanticipated, changes in probability. This instability is a property of the probability model, given by a distributional form and a given configuration of parameters. For correlated data structures found in several application areas, there is increasing interest in identifying such sensitivity in model probability structure. We consider the problem of quantifying instability for general probability models defined on sequences of observations, where each sequence of length $N$ has a

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18

Li, Xiaolei, Ryan E. Keeley, Arman Shafieloo, et al. "Hubble diagram at higher redshifts: model independent calibration of quasars." Monthly Notices of the Royal Astronomical Society 507, no. 1 (2021): 919–26. http://dx.doi.org/10.1093/mnras/stab2154.

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ABSTRACT In this paper, we present a model-independent approach to calibrate the largest quasar sample. Calibrating quasar samples is essentially constraining the parameters of the linear relation between the log of the ultraviolet (UV) and X-ray luminosities. This calibration allows quasars to be used as standardized candles. There is a strong correlation between the parameters characterizing the quasar luminosity relation and the cosmological distances inferred from using quasars as standardized candles. We break this degeneracy by using Gaussian process regression to model-independently rec

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19

Barron, Laurence D. "False Chirality, Absolute Enantioselection and CP Violation: Pierre Curie’s Legacy." Magnetochemistry 6, no. 1 (2020): 5. http://dx.doi.org/10.3390/magnetochemistry6010005.

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The 1884 suggestion of Pierre Curie (1859–1906) that the type of dissymmetry shown by collinear electric and magnetic fields may induce an enantiomeric excess, in a chemical reaction that would otherwise produce a racemic mixture, is explored in the context of fundamental symmetry arguments. Curie’s arrangement exhibits false chirality (time-noninvariant enantiomorphism), and so it may not induce absolute enantioselection (ae) in a process that has reached thermodynamic equilibrium, since it does not lift the degeneracy of chiral enantiomers. However, it may do so in far-from-equilibrium proce

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20

MARASSI, L., J. V. CUNHA, and J. A. S. LIMA. "CONSTRAINING THE NONEXTENSIVE MASS FUNCTION OF HALOS FROM BAO, CMB AND X-RAY DATA." International Journal of Modern Physics D 19, no. 08n10 (2010): 1417–25. http://dx.doi.org/10.1142/s0218271810017901.

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Clusters of galaxies are the most impressive gravitationally-bound systems in the universe, and their abundance (the cluster mass function) is an important statistic to probe the matter density parameter (Ωm) and the amplitude of density fluctuations (σ8). The cluster mass function is usually described in terms of the Press–Schecther (PS) formalism where the primordial density fluctuations are assumed to be a Gaussian random field. In previous works we have proposed a non-Gaussian analytical extension of the PS approach with basis on the q-power law distribution (PL) of the nonextensive kineti

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21

Das, Payel, Ortwin Gerhard, Flavio de Lorenzi, Emily McNeil, Eugene Churazov, and Lodovico Coccato. "The outer haloes of massive, elliptical galaxies." Proceedings of the International Astronomical Union 5, H15 (2009): 92. http://dx.doi.org/10.1017/s1743921310008446.

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The outer haloes of massive elliptical galaxies are dark-matter dominated regions where stellar orbits have longer dynamical timescales than the central regions and therefore better preserve their formation history. Dynamical models out to large radii suffer from a degeneracy between mass and orbital structure, as the outer kinematics are unable to resolve higher moments of the line-of-sight velocity distribution. We mitigate this degeneracy for a sample of quiescent, massive, nearby ellipticals by determining their mass distributions independently using a non-parametric method on X-ray observ

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22

Du, Sichun, and Qing Deng. "Unscented Particle Filter Algorithm Based on Divide-and-Conquer Sampling for Target Tracking." Sensors 21, no. 6 (2021): 2236. http://dx.doi.org/10.3390/s21062236.

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Unscented particle filter (UPF) struggles to completely cover the target state space when handling the maneuvering target tracing problem, and the tracking performance can be affected by the low sample diversity and algorithm redundancy. In order to solve this problem, the method of divide-and-conquer sampling is applied to the UPF tracking algorithm. By decomposing the state space, the descending dimension processing of the target maneuver is realized. When dealing with the maneuvering target, particles are sampled separately in each subspace, which directly prevents particles from degeneracy

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23

Sergeyev, Ivan V., Boris Itin, Rivkah Rogawski, Loren A. Day, and Ann E. McDermott. "Efficient assignment and NMR analysis of an intact virus using sequential side-chain correlations and DNP sensitization." Proceedings of the National Academy of Sciences 114, no. 20 (2017): 5171–76. http://dx.doi.org/10.1073/pnas.1701484114.

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An experimental strategy has been developed to increase the efficiency of dynamic nuclear polarization (DNP) in solid-state NMR studies. The method makes assignments simpler, faster, and more reliable via sequential correlations of both side-chain and Cα resonances. The approach is particularly suited to complex biomolecules and systems with significant chemical-shift degeneracy. It was designed to overcome the spectral congestion and line broadening that occur due to sample freezing at the cryogenic temperatures required for DNP. Nonuniform sampling (NUS) is incorporated to achieve time-effic

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24

Maranville, Brian B., Brian J. Kirby, Alexander J. Grutter, et al. "Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields." Journal of Applied Crystallography 49, no. 4 (2016): 1121–29. http://dx.doi.org/10.1107/s1600576716007135.

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The presence of a large applied magnetic field removes the degeneracy of the vacuum energy states for spin-up and spin-down neutrons. For polarized neutron reflectometry, this must be included in the reference potential energy of the Schrödinger equation that is used to calculate the expected scattering from a magnetic layered structure. For samples with magnetization that is purely parallel or antiparallel to the applied field which defines the quantization axis, there is no mixing of the spin states (no spin-flip scattering) and so this additional potential is constant throughout the scatter

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25

Karpov, Petr, and Serguei Brazovskii. "Pattern Formation and Aggregation in Ensembles of Solitons in Quasi One-Dimensional Electronic Systems." Symmetry 14, no. 5 (2022): 972. http://dx.doi.org/10.3390/sym14050972.

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Broken symmetries of quasi one-dimensional electronic systems give rise to microscopic solitons taking roles of carriers of the charge or spin. The double degeneracy gives rise to solitons as kinks of the scalar order parameter A; the continuous degeneracy for the complex order parameter Aexp(iθ) gives rise to phase vortices, amplitudes solitons, and their combinations. These degrees of freedom can be controlled or accessed independently via either the spin polarization or the charge doping. The long-range ordering in dimensions above one imposes super-long-range confinement forces upon the so

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26

GOLD, A., and O. ANTONIE. "MAGNETORESISTANCE OF A SILICON MOSFET ON THE (111) SURFACE IN A PARALLEL MAGNETIC FIELD." International Journal of Modern Physics B 21, no. 08n09 (2007): 1529–34. http://dx.doi.org/10.1142/s0217979207043142.

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In comparison with silicon (100) we argue that the silicon (111) surface is a surface with higher mobility and stronger Coulomb interaction effects. For the resistance of the two-dimensional electron gas we discuss the effects of a magnetic field parallel to the surface: for zero temperature we present theoretical results for the magnetoresistance of an electron gas at the surface of silicon (111) with a six-fold valley degeneracy. Impurity scattering and interface roughness scattering are taken into account. A recent study of a hydrogen-passivated silicon (111) surface showed a mobility propo

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27

Sarron, F., N. Martinet, F. Durret, and C. Adami. "Evolution of the cluster optical galaxy luminosity function in the CFHTLS: breaking the degeneracy between mass and redshift." Astronomy & Astrophysics 613 (May 2018): A67. http://dx.doi.org/10.1051/0004-6361/201731981.

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Obtaining large samples of galaxy clusters is important for cosmology: cluster counts as a function of redshift and mass can constrain the parameters of our Universe. They are also useful in order to understand the formation and evolution of clusters. We develop an improved version of the Adami & MAzure Cluster FInder (AMACFI), now the Adami, MAzure & Sarron Cluster FInder (AMASCFI), and apply it to the 154 deg2 of the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) to obtain a large catalogue of 1371 cluster candidates with mass M200 > 1014 M⊙ and redshift z ≤ 0.7. We derive

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28

Ghisletta, Paolo, Delphine Fagot, Thierry Lecerf, and Anik de Ribaupierre. "Amplitude of Fluctuations and Temporal Dependency in Intraindividual Variability." GeroPsych 26, no. 3 (2013): 141–51. http://dx.doi.org/10.1024/1662-9647/a000091.

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In a sample of 165 older individuals assessed twice at a 2-year interval on tasks of fluid and crystallized intelligence, and intensively (120 trials) on a simple reaction time task, we applied an autoregressive model to estimate both (1) amplitude and (2) time dependency in intraindividual variability (IIV). Results indicate that both IIV features are stronger predictors than the overall mean of intelligence scores 2 years later. Individuals that produced more (1) variable but also (2) erratic latencies of responses at baseline had lower intelligence scores 2 years later. We speculate that we

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29

Scannapieco, Evan, and Crystal L. Martin. "Constraining the Intergalactic Medium Enrichment History with QSO Pairs." Proceedings of the International Astronomical Union 5, S265 (2009): 163–66. http://dx.doi.org/10.1017/s1743921310000463.

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AbstractIntergalactic metals are ubiquitous, but their sources remain unknown. A key constraint on these sources is the spatial distributions of metals. Yet, the clustering of metals is difficult to interpret along single lines-of-sight, because distance and velocity information are mixed in redshift space. To overcome this situation we are carrying out detailed comparisons between the line-of-sight and transverse distributions of metal line absorption systems observed in a large sample of QSO pairs and simulations including a wide range of IGM-enrichment scenarios. The degeneracy between dist

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30

Naqib, Ankur, Silvana Poggi, and Stefan J. Green. "Deconstructing the Polymerase Chain Reaction II: an improved workflow and effects on artifact formation and primer degeneracy." PeerJ 7 (June 14, 2019): e7121. http://dx.doi.org/10.7717/peerj.7121.

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Polymerase chain reaction (PCR) amplification of complex microbial genomic DNA templates with degenerate primers can lead to distortion of the underlying community structure due to inefficient primer-template interactions leading to bias. We previously described a method of deconstructed PCR (“PEX PCR”) to separate linear copying and exponential amplification stages of PCR to reduce PCR bias. In this manuscript, we describe an improved deconstructed PCR (“DePCR”) protocol separating linear and exponential stages of PCR and allowing higher throughput of sample processing. We demonstrate that th

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31

Ryu, Yoon-Hyun, Youn Kil Jung, Hongjing Yang, et al. "Mass Production of 2021 KMTNet Microlensing Planets. I." Astronomical Journal 164, no. 5 (2022): 180. http://dx.doi.org/10.3847/1538-3881/ac8d6c.

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Abstract We inaugurate a program of “mass production” of microlensing planets discovered in 2021 KMTNet data, with the aim of laying the basis for future statistical studies. While we ultimately plan to quickly publish all 2021 planets meeting some minimal criteria, the current sample of four was chosen simply on the basis of having low initial estimates of the planet–host mass ratio, q. It is therefore notable that two members of this sample suffer from a degeneracy in the normalized source radius ρ that arises from different morphologies of closely spaced caustics. All four planets (KMT-2021

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32

LI, ZHI-YUAN, RONG-JUAN LIU, LIN GAN, JIN-XIN FU, and JIN LIAN. "NONRECIPROCAL ELECTROMAGNETIC DEVICES IN GYROMAGNETIC PHOTONIC CRYSTALS." International Journal of Modern Physics B 28, no. 02 (2013): 1441010. http://dx.doi.org/10.1142/s0217979214410100.

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Gyromagnetic photonic crystal (GPC) offers a promising way to realize robust transport of electromagnetic waves against backscattering from various disorders, perturbations and obstacles due to existence of unique topological electromagnetic states. The dc magnetic field exerting upon the GPC brings about the time-reversal symmetry breaking, splits the band degeneracy and opens band gaps where the topological chiral edge states (CESs) arise. The band gap can originate either from long-range Bragg-scattering effect or from short-range localized magnetic surface plasmon resonance (MSP). These to

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33

Iwanowicz, Deborah D., Judy Y. Wu-Smart, Tugce Olgun, et al. "An updated genetic marker for detection of Lake Sinai Virus and metagenetic applications." PeerJ 8 (July 17, 2020): e9424. http://dx.doi.org/10.7717/peerj.9424.

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Background Lake Sinai Viruses (LSV) are common RNA viruses of honey bees (Apis mellifera) that frequently reach high abundance but are not linked to overt disease. LSVs are genetically heterogeneous and collectively widespread, but despite frequent detection in surveys, the ecological and geographic factors structuring their distribution in A. mellifera are not understood. Even less is known about their distribution in other species. Better understanding of LSV prevalence and ecology have been hampered by high sequence diversity within the LSV clade. Methods Here we report a new polymerase cha

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Taggart, K., and D. A. Perley. "Core-collapse, superluminous, and gamma-ray burst supernova host galaxy populations at low redshift: the importance of dwarf and starbursting galaxies." Monthly Notices of the Royal Astronomical Society 503, no. 3 (2021): 3931–52. http://dx.doi.org/10.1093/mnras/stab174.

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ABSTRACT We present a comprehensive study of an unbiased sample of 150 nearby (median redshift, z = 0.014) core-collapse supernova (CCSN) host galaxies drawn from the All-Sky Automated Survey for Supernovae (ASAS-SN) for direct comparison to the nearest long-duration gamma-ray burst (LGRB) and superluminous supernova (SLSN) hosts. We use public imaging surveys to gather multiwavelength photometry for all CCSN host galaxies and fit their spectral energy distributions (SEDs) to derive stellar masses and integrated star formation rates (SFRs). CCSNe populate galaxies across a wide range of stella

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BOUMRAR, H., O. RAFIL, M. TAMINE, and R. TIGRINE. "DYNAMICAL PROPERTIES OF THE INTERFACE BETWEEN TWO THIN FILMS." Surface Review and Letters 12, no. 01 (2005): 85–96. http://dx.doi.org/10.1142/s0218625x05006810.

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The effect on the vibrational properties of nanostructures at the interface between two thin films is presented. The model used consists of the coupling of two semi-infinite plans A and B having three and two atomic layers, respectively. Theoretical calculations of localized phonon modes and vibrational field were carried out using the matching procedure. Close to the interface, the transversal translational symmetry is broken down inducing Raleigh-like branches. The polarization degeneracy of the ordered surface Raleigh mode in the longitudinal direction is lifted. The presence of acoustic an

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Hanif, Ayub, and Robert Elliott Smith. "State Space Modeling & Bayesian Inference with Computational Intelligence." New Mathematics and Natural Computation 11, no. 01 (2015): 71–101. http://dx.doi.org/10.1142/s1793005715500040.

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Recursive Bayesian estimation using sequential Monte Carlos methods is a powerful numerical technique to understand latent dynamics of nonlinear non-Gaussian dynamical systems. It enables us to reason under uncertainty and addresses shortcomings underlying deterministic systems and control theories which do not provide sufficient means of performing analysis and design. In addition, parametric techniques such as the Kalman filter and its extensions, though they are computationally efficient, do not reliably compute states and cannot be used to learn stochastic problems. We review recursive Bay

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de Oliveira, Paulo Murilo Castro. "Broad Histogram Simulation: Microcanonical Ising Dynamics." International Journal of Modern Physics C 09, no. 03 (1998): 497–503. http://dx.doi.org/10.1142/s012918319800039x.

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We revisit here a new Monte Carlo approach, namely the Broad Histogram Method. It is based on two quantities, the numbers N up and N dn of potential modifications which could be performed starting from the system's current state, increasing or decreasing its energy E, respectively. Thus, the energy degeneracy g(E) can be directly determined from the microcanonical averages <N up (E)> and <N dn (E)> of these two quantities. This method was first tested by sampling states from a random walk along the energy axis, for which the control of possible correlations between successive avera

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Hafner, Christian M., Sebastien Laurent, and Francesco Violante. "WEAK DIFFUSION LIMITS OF DYNAMIC CONDITIONAL CORRELATION MODELS." Econometric Theory 33, no. 3 (2016): 691–716. http://dx.doi.org/10.1017/s0266466616000128.

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The properties of dynamic conditional correlation (DCC) models, introduced more than a decade ago, are still not entirely known. This paper fills one of the gaps by deriving weak diffusion limits of a modified version of the classical DCC model. The limiting system of stochastic differential equations is characterized by a diffusion matrix of reduced rank. The degeneracy is due to perfect collinearity between the innovations of the volatility and correlation dynamics. For the special case of constant conditional correlations, a nondegenerate diffusion limit can be obtained. Alternative sets of

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Yao, Wenlong, Yuan Liu, Honghai Sun, et al. "Optimal Control Strategy for Marine Ssp Podded Propulsion Motor Based on Strong Tracking-Epf." Polish Maritime Research 22, s1 (2015): 4–9. http://dx.doi.org/10.1515/pomr-2015-0024.

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Abstract Aiming at the non-linearity of state equation and observation equation of SSP (Siemen Schottel Propulsor) propulsion motor, an improved particle filter algorithm based on strong tracking extent Kalman filter (ST-EKF) was presented, and it was imported into the marine SSP propulsion motor control system. The strong tracking filter was used to update particles in the new algorithm and produce importance densities. As a result, the problems of particle degeneracy and sample impoverishment were ameliorated, the propulsion motor states and the rotor resistance were estimated simultaneously

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Elbrecht, Vasco, Thomas W. A. Braukmann, Natalia V. Ivanova, et al. "Validation of COI metabarcoding primers for terrestrial arthropods." PeerJ 7 (October 7, 2019): e7745. http://dx.doi.org/10.7717/peerj.7745.

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Metabarcoding can rapidly determine the species composition of bulk samples and thus aids biodiversity and ecosystem assessment. However, it is essential to use primer sets that minimize amplification bias among taxa to maximize species recovery. Despite this fact, the performance of primer sets employed for metabarcoding terrestrial arthropods has not been sufficiently evaluated. This study tests the performance of 36 primer sets on a mock community containing 374 insect species. Amplification success was assessed with gradient PCRs and the 21 most promising primer sets selected for metabarco

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Casey, Caitlin M. "Seeking Completeness for high-z ULIRGs: from SCUBA to Herschel." Proceedings of the International Astronomical Union 6, S277 (2010): 142–45. http://dx.doi.org/10.1017/s1743921311022642.

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AbstractSelection effects in the submillimeter/far-infrared inhibit detailed analysis of extreme starbursts in the early Universe. Submillimeter Galaxy (SMG) detection and characterization biases against warm temperature SEDs Tdust ~50 K, against the highest redshift ULIRGs z > 3, and has so far been limited to a small sample of ~100 sources that have reliably identified optical or radio counterparts and spectroscopic redshifts. Recent observations by Herschel ⋅ ⋅ ⋅ ⋅ and ⋅ ⋅ ⋅⋅ ⋅ in the ~70–500 μm wavelength range provide a more complete census of high-z ULIRG activity than previous SMG su

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Minhas, Shahryar, Peter D. Hoff, and Michael D. Ward. "Inferential Approaches for Network Analysis: AMEN for Latent Factor Models." Political Analysis 27, no. 2 (2018): 208–22. http://dx.doi.org/10.1017/pan.2018.50.

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We introduce a Bayesian approach to conduct inferential analyses on dyadic data while accounting for interdependencies between observations through a set of additive and multiplicative effects (AME). The AME model is built on a generalized linear modeling framework and is thus flexible enough to be applied to a variety of contexts. We contrast the AME model to two prominent approaches in the literature: the latent space model (LSM) and the exponential random graph model (ERGM). Relative to these approaches, we show that the AME approach is (a) to be easy to implement; (b) interpretable in a ge

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Tress, M., I. Ferreras, P. G. Pérez-González, et al. "A deeper look at the dust attenuation law of star-forming galaxies at high redshift." Monthly Notices of the Royal Astronomical Society 488, no. 2 (2019): 2301–11. http://dx.doi.org/10.1093/mnras/stz1851.

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ABSTRACT A diverse range of dust attenuation laws is found in star-forming galaxies. In particular, Tress et al. (2018) studied the SHARDS survey to constrain the NUV bump strength (B) and the total-to-selective ratio (RV) of 1753 star-forming galaxies in the GOODS-N field at 1.5 < z < 3. We revisit here this sample to assess the implications and possible causes of the correlation found between RV and B. The UVJ bicolour plot and main sequence of star formation are scrutinized to look for clues into the observed trend. The standard boundary between quiescent and star-forming galaxies is

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Howard, Ward S., and Meredith A. MacGregor. "No Such Thing as a Simple Flare: Substructure and Quasi-periodic Pulsations Observed in a Statistical Sample of 20 s Cadence TESS Flares." Astrophysical Journal 926, no. 2 (2022): 204. http://dx.doi.org/10.3847/1538-4357/ac426e.

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Abstract A 20 s cadence Transiting Exoplanet Survey Satellite monitoring campaign of 226 low-mass flare stars during Cycle 3 recorded 3792 stellar flares of ≥1032 erg. We explore the time-resolved emission and substructure in 440 of the largest flares observed at high signal-to-noise, 97% of which released energies of ≥1033 erg. We discover degeneracy present at 2 minute cadence between sharply peaked and weakly peaked flares is common, although 20 s cadence breaks these degeneracies. We better resolve the rise phases and find 46% of large flares exhibit substructure during the rise phase. We

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Lombardo, Linda, Patrick François, Piercarlo Bonifacio, et al. "Young giants of intermediate mass." Astronomy & Astrophysics 656 (December 2021): A155. http://dx.doi.org/10.1051/0004-6361/202141408.

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Context. In the search of a sample of metal-poor bright giants using Strömgren photometry, we serendipitously found a sample of 26 young (ages younger than 1 Gyr) metal-rich giants, some of which have high rotational velocities. Aims. We determined the chemical composition and rotational velocities of these stars in order to compare them with predictions from stellar evolution models. These stars where of spectral type A to B when on the main sequence, and we therefore wished to compare their abundance pattern to that of main-sequence A and B stars. Methods. Stellar masses were derived by comp

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Byun, Joyce, Felipe Oliveira Franco, Cullan Howlett, Camille Bonvin, and Danail Obreschkow. "Constraining the growth rate of structure with phase correlations." Monthly Notices of the Royal Astronomical Society 497, no. 2 (2020): 1765–90. http://dx.doi.org/10.1093/mnras/staa2020.

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ABSTRACT We show that correlations between the phases of the galaxy density field in redshift space provide additional information about the growth rate of large-scale structure that is complementary to the power-spectrum multipoles. In particular, we consider the multipoles of the line correlation function (LCF), which correlates phases between three collinear points, and use the Fisher forecasting method to show that the LCF multipoles can break the degeneracy between the measurement of the growth rate of structure f and the amplitude of perturbations σ8 that is present in the power-spectrum

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Yang, Ming, Alceste Z. Bonanos, Bi-Wei Jiang, et al. "Evolved massive stars at low metallicity." Astronomy & Astrophysics 639 (July 2020): A116. http://dx.doi.org/10.1051/0004-6361/201937168.

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We present the most comprehensive red supergiant (RSG) sample for the Small Magellanic Cloud (SMC) to date, including 1239 RSG candidates. The initial sample was derived based on a source catalog for the SMC with conservative ranking. Additional spectroscopic RSGs were retrieved from the literature, and RSG candidates were selected based on the inspection of Gaia and 2MASS color-magnitude diagrams (CMDs). We estimate that there are in total ∼1800 or more RSGs in the SMC. We purify the sample by studying the infrared CMDs and the variability of the objects, though there is still an ambiguity be

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Kumar, Suresh, Rafael C. Nunes, and Priya Yadav. "Updating non-standard neutrinos properties with Planck-CMB data and full-shape analysis of BOSS and eBOSS galaxies." Journal of Cosmology and Astroparticle Physics 2022, no. 09 (2022): 060. http://dx.doi.org/10.1088/1475-7516/2022/09/060.

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Abstract Using the latest observational data from Planck-CMB and its combination with the pre-reconstructed full-shape (FS) galaxy power spectrum measurements from the BOSS DR12 sample and eBOSS LRG DR16 sample, we report the observational constraints on the cosmic neutrino properties given by the extended ΛCDM scenario: ΛCDM + N eff + ∑ mν + c 2 eff + c 2 vis + ξν , and its particular case ΛCDM + c 2 eff + c 2 vis + ξν , where N eff, ∑ mν , c 2 eff, c 2 vis, ξν are the effective number of species, the total neutrino mass, the sound speed in the neutrinos rest frame, the viscosity parameter an

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Divya, G. Naga, and S. Koteswara Rao. "Application of Sigma Point Particle Filter Method for Passive State Estimation in Underwater." Defence Science Journal 71, no. 4 (2021): 507–14. http://dx.doi.org/10.14429/dsj.71.16284.

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Bearings-only tracking (BOT) plays a vital role in underwater surveillance. In BOT, measurement is tangentially related to state of the system. This measurement is also corrupted with noise due to turbulent underwater environment. Hence state estimation process using BOT becomes nonlinear. This necessitates the use of nonlinear filtering algorithms in place of traditional linear filters like Kalman filter. In general, these nonlinear filters utilize the assumption of measurements being corrupted with Gaussian noise for state estimation. The measurements cannot be always corrupted with Gaussian

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Banerjee, Soumya, and S. Jonathan Chapman. "Influence of correlated antigen presentation on T-cell negative selection in the thymus." Journal of The Royal Society Interface 15, no. 148 (2018): 20180311. http://dx.doi.org/10.1098/rsif.2018.0311.

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The thymus is the primary organ for the generation of naive T cells, a key component of the immune system. Tolerance of T cells to self is achieved primarily in the thymic medulla, where immature T cells (thymocytes) sample self-peptides presented by medullary thymic epithelial cells (mTECs). A sufficiently strong interaction activates the thymocytes leading to negative selection. A key question of current interest is whether there is any structure in the manner in which mTECs present peptides: can any mTEC present any peptide at any time, or are there particular patterns of correlated peptide

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