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Добірка наукової літератури з теми "Sample Degeneracy"

Автор: Grafiati

Опубліковано: 10 березня 2023

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Статті в журналах з теми "Sample Degeneracy"

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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