cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Electroreduction of oxygen to hydrogen peroxide of particulate electrodes
Creators: name: Oloman, Colin
Publisher: name: University of British Columbia
Year: 2010

description: The generation of hydrogen peroxide in dilute sodium hydroxide solutions was investigated by the electro-reduction of oxygen on beds of graphite particles. Two continuous electrochemical reactors were used to study the process at 16 to 20°C with oxygen pressures up to 12 atmospheres. The study embraced operation of the graphite cathode as both a fixed and a fluidised bed, though only the fixed bed was used at superatmospheric pressure. In each case both a two-phase system (cathode/oxygenated catholyte) and a three-phase system (cathode/catholyte/oxygen gas) were employed. The effects of the catholyte flow rate, catholyte pH, graphite particle size, bed depth, bed expansion, oxygen pressure, oxygen flow rate and the applied current on the process efficiency were measured. Depending on the conditions, the current efficiency for the conversion of oxygen to peroxide was between 20% and 100%, the yield of peroxide from oxygen was up to about 85% and the product peroxide concentration ranged from 0 to 0.15 molar. The results are interpreted in terms of the hydrodynamics and electrochemical kinetics in the cathode bed.
Linguistic analysis of health anxiety during COVID-19
Creators: name: Peterson, Alexandra D.
name: Kibbey, Mindy
name: Farris, Samantha
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Clinical Psychology
subject: Health Psychology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: Health anxiety, which is defined as fear of having or contracting serious physical illness, is particularly salient in light of the COVID-19 pandemic. We conducted a mixed methods study in which 578 narrative samples were analyzed using Linguistic Inquiry and Word Count (LIWC) software to determine linguistic markers from six LIWC categories relevant to cognitive-behavioral features of health anxiety. Broad linguistic predictors were analyzed through three backward elimination regression models in order to inform subcategory predictors of each area of health anxiety. Thus, both broad and specific linguistic predictors of general health anxiety, virus-relevant body vigilance, and fears of viral contamination were examined. Greater use of affective category words in written narratives predicted general health anxiety, as well as body vigilance and viral contamination fears. These findings represent the first direct demonstration of linguistic analysis of health anxiety and provide nuanced information about the nature and etiology of health anxiety.
Additional file 4 of Molecular characterization of Streptococcus suis isolates recovered from diseased pigs in Europe
Creators: name: Li, Kevin
name: Lacouture, Sonia
name: Lewandowski, Eric
name: Thibault, Eric
name: Gantelet, Hubert
name: Gottschalk, Marcelo
name: Fittipaldi, Nahuel
Publisher: name: figshare
Year: 2024
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics

description: Additional file 4. Phylogenetic relationships based on core-genome single-nucleotide polymorphisms (SNPs) and genomic traits of the 251 Streptococcus suis isolates using a different reference genome. This figure presents a maximum-likelihood phylogenetic tree (left panel), constructed using 8,611 non-redundant core-genome SNP loci identified relative to the genome sequence of the ST16 serotype 9 reference strain GD-0088. This analysis confirms the findings depicted in Figure 3, using a different reference to provide comparative insights. The tree highlights several distinct clades, emphasizing the genetic diversity among the isolates. For reference, the serotype of each isolate, along with the genotypes determined by multilocus sequence typing (MLST), are annotated along the tree, showing their association with specific genomic clades. The right panel depicts the presence (in purple) or absence (in light blue) of antimicrobial resistance (AMR) genes and virulence-associated genes (VAGs), as determined from the whole-genome sequences of each isolate. “UT” denotes an untypable isolate.
title: Seasonal Distribution of Sage-Grouse in Hamlin Valley, Utah and the Effect of Fences on Grouse and Avian Predators
Creators: name: McPherron, Heather Hedden
Publisher: name: Utah State University
Year: 2017

description: Greater sage-grouse (Centrocercus urophasianus; hereafter sage-grouse) numbers have declined throughout the western US and are considered a species of concern in most of the eleven states that are within their range. Sage-grouse habitats have been reduced by approximately 44% since European settlement of the Western United States began (Miller et al. 2011). Loss of habitat has contributed to an average decline of sage-grouse populations by 33% across the range (Connelly and Braun 1997). To expand our knowledge of this species, I monitored 16 radio-collared sage-grouse captured from four leks in Hamlin Valley, Utah, USA in 2011 and 2012 to determine habitat use. The Hamlin Valley population was primarily one-stage migratory but non-migratory behaviors were also observed. Birds from at least one of the leks used seasonal habitats in neighboring Nevada.
Sage-grouse evolved in habitats where infrastructure (e.g. vertical structures) was not common. Introduction of infrastructure, such as fences in their habitat, can cause direct mortality via collision but may also indirectly influence productivity by increasing artificial perches for avian predators (e.g. golden eagles (Aquila chrysaetos) , red-tailed hawks (Buteo jamaicensis), and common ravens (Corvus corax). This research focused on collision rates and increased potential for avian predation on two small populations on the southern portion of the range of current occupied sage-grouse habitat in southwestern vi Utah. During 2011-2012, over 450 km of fences were surveyed for signs of collision and use by avian predators during all seasons (breeding, fall migration, and winter). No sage-grouse collisions were observed suggesting that management for sage-grouse in small populations may be better focused on improving habitat and reducing other causes of mortality which may be more prevalent. Fence post width (i.e. the perching surface) was the best predictor of use as perch by avian predators. Additionally, areas farther from other natural perches, with a low density of surrounding vegetation, and fences constructed along defined habitat edges were used by avian predators more frequently. Results of this study suggest that managers should construct fences with small widths to deter avian predators and care should be taken to maintain contiguous vegetation on either side of the posts while maintaining low shrub density.
Dispersion of biased swimming microorganisms in a fluid flowing through a tube
Creators: name: Bees, M. A.
name: Croze, O. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Classical Taylor-Aris dispersion theory is extended to describe the transport of suspensions of self-propelled dipolar cells in a tubular flow. General expressions for the mean drift and effective diffusivity are determined exactly in terms of axial moments, and compared with an approximation a la Taylor. As in the Taylor-Aris case, the skewness of a finite distribution of biased swimming cells vanishes at long times. The general expressions can be applied to particular models of swimming microorganisms, and thus be used to predict swimming drift and diffusion in tubular bioreactors, and to elucidate competing unbounded swimming drift and diffusion descriptions. Here, specific examples are presented for gyrotactic swimming algae.
description: 20 pages, 4 figures. Published version available at http://rspa.royalsocietypublishing.org/content/early/2010/02/09/rspa.2009.0606.short?rss=1
Sharing the load: stress redistribution governs fracture of polymer double networks
Creators: name: Tauber, Justin
name: Rovigatti, Lorenzo
name: Dussi, Simone
name: van der Gucht, Jasper
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The stress response of polymer double networks depends not only on the properties of the constituent networks, but also on the interactions arising between them. Here we demonstrate, via coarse-grained simulations, that both their global stress response and their microscopic fracture mechanics are governed by load sharing through these inter-network interactions. By comparing our results with affine predictions, where stress redistribution is by definition homogeneous, we show that stress redistribution is highly inhomogeneous. In particular, the affine prediction overestimates the fraction of broken chains by almost an order of magnitude. Furthermore, homogeneous stress distribution predicts a single fracture process, while in our simulations fracture of sacrificial chains takes place in two steps governed by load sharing within a network and between networks, respectively. Our results thus provide a detailed microscopic picture of how inhomogeneous stress redistribution after rupture of chains governs the fracture of polymer double networks.
description: 34 pages, 8 figures, including supporting information (12 pages, 8 figures)
title: Coordination Chemistry of Bidentate Difluorophosphines
Creators: name: Gallup, Darrell Lynn
Publisher: name: Utah State University
Year: 1978

description: The reactions of 1, 2–bis(difluorophosphino)cyclohexane, PF2C6H10PF2, with hexacarbonyls of Cr(O), Mo(O), and W(O) have been extensively investigated. The hexacarbonyls react, either under photolytic or thermolytic conditions, to produce carbon monoxide and oily mixtures of products of the general formulations, [M(CO)4(PF2C6H10PF2C)]x, where x varies apparently from 1 – 4. The higher values of x, corresponding to species involving bridging ligands, are more common to the photolysis rather than the thermolysis reactions. Photolysis reactions of Mo(Co)6 with increasing amounts of the ligand does not result in the higher substitution products, Mo(Co)2(PF2C6H10PF2)2 and Mo(PF2C6H10PF2)3.
The reactions of PF2C6H10PF2 with the norbornadiene tetracarbonyl complexes of Cr(O), Mo(O), and W(O) produce relatively air-stable chelates of the general formulation, M(Co)4(PF2C6H10PF2). Mo(CO)4(PF2C6H10PF2) will react with more PF2C6H10PF2 to give [Mo(CO)2(PF2C6H10PF2)2]2. A slight excess of PF2C6H10PF2 also reacts readily with ditoluenemolybdenum (O) displacing toluene to give Mo(PF2C6H10PF2)3, and air-stable monomer. Analysis of the infrared spectra of these chelates indicates that the ligand fits into a sequence of π–acceptor strength as: PF3>PCI3~ PF2C6H10PF2>RN(PF2)2>>Ph2PC2H4PPh2. NMR spectral parameters for the chelates verify the very strong coordination of the bidentate ligand to the metals.
1, 2-bis(difluorophosphino)cyclohexane has also been found to react with pentacarbonyliron(O), Fe(Co)5 and with pentacarbonylmanganese(I) bromide, Mn(CO)5Br, in hexane, displacing two moles of carbon monoxide per mole of ligand. The products resulting, (PF2C6H10PF2)Fe(Co)3, (PF2C6H10PF2)2Fe(CO), (PF2C6H10PF2)Mn(CO)3Br, and (PF2C6H10PF2)2Mn(CO)Br, are all air-stable solid monomers indicating that the ligand is an effective chelating agent. Analysis of their and nmr spectral data supports the conclusion that PF2C6H10PF2 functions as a strong π–acceptor and assists in assigning structures. The reactions of PF2C6H10PF2 in solution with Co2(CO)8 and the chlorides of Ni(II), Pd(II), and Pt(II) have been investigated. The resultant complexes are not well defined. The characterization of the complexes has given ambiguous results, although the nickel group metal complexes appear to be dimeric.
The ligand, 1,2-bis(difluorophosphino)ethane, PF2C2H4PF2, reacts with tetracarbonylnickel(O), Ni(Co)4, in the gas phase and in solution, to produce carbon monoxide and the polymer, [Ni(PF2C2H4PF2)2]x. PF2C2H4PF2 displaces norbornadiene from (C7H8)Mo(Co)4 to yield the relatively air-stable complex, Mo(CO)4(PF2C2H4PF2). Analysis of the infrared spectrum of the monomeric complex indicates that the ligand exhibits π–acceptor strength equal to PF2C6H10PF2.
title: An Exposition on Bayesian Inference
Creators: name: Laffoon, John
Publisher: name: Utah State University
Year: 1967

description: The Bayesian approach to probability and statistics is described, a brief history of Bayesianism is related, differences between Bayesian and Frequentist schools of statistics are defined, protential applications are investigated, and a literature survey is presented in the form of a machine-sort card file.
Bayesian thought is increasing in favor among statisticians because of its ability to attack problems that are unassailable from the Frequentist approach. It should become more popular among practitioners because of the flexibility it allows experimenters and the ease with which prior knowledge can be combined with experimental data. (82 pages)
V1647 ORIONIS: Keck/Nirspec 2 MICRON Echelle Observations
Creators: name: Aspin, Colin
name: Greene, Tom P.
name: Reipurth, Bo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present new Keck II NIRSPEC high-spectral resolution 2 um echelle observations of the young eruptive variable star V1647 Orionis. This star went into outburst in late 2003 and faded to its pre-outburst brightness after approximately 26 months. V1647 Orionis is the illuminating star of McNeil's Nebula and is located near M 78 in the Lynds 1630 dark cloud. Our spectra have a resolving power of approximately 18,000 and allow us to study in detail the weak absorption features present on the strong near-IR veiled continuum. An analysis of the echelle orders containing Mg I (2.1066 um) and Al I (2.1099 um), Br-gamma (2.1661 um), the Na I doublet (2.206 and 2.209 um), and the CO overtone bandhead (2.2935 um) gives us considerable information on the physical and geometric characteristics of the regions producing these spectral features. We find that, at high-spectral resolution, V1647 Orionis in quiescence resembles a significant number of FU Orionis type eruptive variables and does not appear similar to the quiescent EX Lupi variables observed. This correspondence is discussed and implications for the evolutionary state of the star are considered.
description: 37 pages, 3 Tables, 17 Figures
title: Rational Arithmetic as a Means of Matrix Inversion
Creators: name: Peterson, Jay Roland
Publisher: name: Utah State University
Year: 1967

description: The solution to a set of simultaneous equations is of the form A-1 B = X where A-1 is the inverse of A in the equation AX= B. The purpose of this study is to obtain an exact A-1 through the use of rational arithmetic, and to study the behavior of rational numbers when used in arithmetic calculations.
This study describes a matrix inversion program written in SPS II, utilizing the concept of rational arithmetic. This program, using the Gaussian elimination matrix inversion method, is compared to the same method written in Fortran. Gaussian elimination was used by this study because of its simplicity and speed of inversion. The Adjoint method was ruled out because of its complexity and relative lack of speed when compared with Gaussian elimination.
The Fortran program gives only an approximate inverse due to the rounding error while the rational arithmetic program gives an exact inverse.
Confinement limit of Dirac particles in scalar 1D potentials
Creators: name: Unanyan, R. G.
name: Otterbach, J.
name: Fleischhauer, M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a general proof that Dirac particles cannot be localized below their Compton length by symmetric but otherwise arbitrary scalar potentials. This proof does not invoke the Heisenberg uncertainty relation and thus does not rely on the nonrelativistic linear momentum relation. Further it is argued that the result is also applicable for more general potentials, as e.g. generated by nonlinear interactions. Finally a possible realisation of such a system is proposed.
description: 2 pages
title: Reliability and Maintainability Sampling Procedures for Life Cycle Cost Evaluation
Creators: name: Harris, Doyle H.
Publisher: name: Utah State University
Year: 1968

description: The intent of this thesis is to investigate, develop, and apply techniques to determine the reliability and maintainability of populations of items. These techniques are to be used in determining the total life-time operating costs of the populations so that those items with the lowest life-time costs can be bought. To do this, the author has explored current techniques for determining compliance to some minimum required Mean Time Between Failure (MTBF) in what is referred to as a Phase I testing. After the requirements of Phase I testing have been met, testing may be continued at the option of the contractor and confidence limits constructed about the Bid MTBF to determine compliance to it. Methods by which incentives or penalties may be rewarded or assessed to contractor as a result of the Phase II testing are included. The author next investigated techniques which can be used to determine the maintainability parameters and the accuracy of these parameters. Finally, since the reliability techniques explored were all based on the exponential distribution, techniques were included to prove if the failure rate was exponential. If not, discussions were incorporated on how to handle this situation. (85 pages)
title: Geology of the Monte Cristo Area, Bear River Range, Utah
Creators: name: Smith, Robert B.
Publisher: name: Utah State University
Year: 1965

description: The Monte Cristo area is a 7 1/2-minute quadrangle located in the southeastern. part of the Bear River Range, northern Utah. It is within the Middle Rocky Mountain province and is 10 miles east of the Basin and Range province. Previous to this investigation little was known about the detailed geology of the area except for a reconnaissance study and general geologic map of the Cache County part included in the Geologic Atlas of Utah, Cache County, published by Williams (1958).
The purposes of this investigation were as follows: (1) to determine the formations present in the area and their relation to regional stratigraphy, (2) to determine the structure of the area and its relation to regional.structure, and (3). to produce a geologic map of the area (Plate 1).
title: Kokanee Fry Recruitment and Early Life History in the Lake Tahoe Basin
Creators: name: Gemperle, Christine K.
Publisher: name: Utah State University
Year: 1998

description: Lake Tahoe kokanee salmon have experienced decreasing mean adult size and fluctuating populations since 1970. We proposed to determine whether fish production was limited by spawning and incubation processes in Taylor Creek , or by growth constraints , or by mortality in the lake by studying egg-to-fry survival rates and early life history . Estimated egg-to-fry survival was 15. 9% for the 1994 brood year and 1.5% for the 1995 brood year. Egg-to-adult survival was 3.5% for the 1991 brood year and 5.9% for the 1992 brood year. Of the 35 possible survival scenarios, egg-to-fry survival was 7.5-20% and fry-to-adult survival (inlake phase) was 20-60%. The differing egg-to-fry survival rates corresponded to different stream temperature regimes during critical incubation periods.
During and after the outmigration, fry inhabited the littoral zone, pelagic zone, and an estuarine environment created by a flooded meadow. Chironomids were the dominant prey in both 1995 and 1996 for fry in the littoral regions. Fry declined in the littoral zone approximately 30 days after peak outmigration during both 1995 and 1996. Juveniles and adults in the lake inhabited the upper 10 m of the water column and consumed primarily copepods for most of their limnetic life.
Otolith analysis revealed that five year classes were present with the fifth year class representing 15.0% (1995) to 7.6% (1996) of the spawning population. Despite Lake Tahoe's low productivity, kokanee achieved greater size at age-4 than many other populations. Low densities (14.5 fish/hectare) and warmer winter temperatures may enable kokanee to reach greater size. Kokanee production may be limited by warm stream temperatures during spawning and early incubation in some years. Egg-to-fry survival is the most limiting factor. Enhancement of the kokanee population should focus on this phase of life history. Kokanee are not native to the Lake Tahoe Basin, which is considerably south of their historic range. Kokanee may be limited by inadequate adaptation to California's mild climate.
An Imaging Search for Post-Main-Sequence Planets of Sirius B
Creators: name: Lucas, Miles
name: Bottom, Michael
name: Ruane, Garreth
name: Ragland, Sam
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present deep imaging of Sirius B, the closest and brightest white dwarf, to constrain post-main-sequence planetary evolution in the Sirius system. We use Keck/NIRC2 in L'-band (3.776 $μ$m) across three epochs in 2020 using the technique of angular differential imaging. Our observations are speckle-limited out to 1 AU and background-limited beyond. The 5$σ$ detection limits from our best performing epoch are 17 to 20.4 L' absolute magnitude. We consider multiple planetary formation pathways in the context of Sirius B's evolution to derive mass sensitivity limits, and achieve sub-Jupiter sensitivities at sub-AU separations, reaching 1.6 $\mathrm{M_J}$ to 2.4 $\mathrm{M_J}$ at 0.5 AU down to a sensitivity of 0.7 $\mathrm{M_J}$ to 1.2 $\mathrm{M_J}$ at >1 AU. Consistent with previous results, we do not detect any companions around Sirius B. Our strong detection limits demonstrate the potential of using high-contrast imaging to characterize nearby white dwarfs.
description: 16 pages, 13 figures, accepted by the Astronomical Journal, code and extra figures available at https://github.com/mileslucas/sirius-b
LambdaCDM epoch reconstruction from F(R,G) and modified Gauss-Bonnet gravities
Creators: name: Elizalde, Emilio
name: Myrzakulov, Ratbay
name: Obukhov, Valery V.
name: Sáez-Gómez, Diego
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Dark energy cosmology is considered in a modified Gauss-Bonnet model of gravity with and without a scalar field. It is shown that these generalizations of General Relativity endow it with a very rich cosmological structure: it may naturally lead to an effective cosmological constant, quintessence or phantom cosmic acceleration, with the possibility to describe the transition from a decelerating to an accelerating phase explicitly. It is demonstrated here that these modified GB and scalar-GB theories are perfectly viable as cosmological models. They can describe the LambdaCDM cosmological era without any need for a cosmological constant. Specific properties of these theories of gravity in different particular cases, such as the de Sitter one, are studied.
description: 14 pages
Wigner Function of Observed Quantum Systems
Creators: name: Carreño, Juan Camilo López
Publisher: name: arXiv
Year: 2025
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Wigner function was introduced as an attempt to describe quantum-mechanical fields with the tools inherited from classical statistical mechanics. In particular, it is widely used to describe the properties of radiation fields. In fact, a useful way to distinguish between classical and nonclassical states of light is to ask whether their Wigner function has a Gaussian profile or not, respectively. In this paper, we use the basis of Fock states to provide the closed-form expression for the Wigner function of an arbitrary quantum state. Thus, we provide the general expression for the Wigner function of a squeezed Fock, coherent and thermal states, with an arbitrary squeezing parameter. Then, we consider the most fundamental quantum system, Resonance Fluorescence, and obtain closed-form expressions for its Wigner function under various excitation regimes. With them, we discuss the conditions for obtaining a negative-valued Wigner function and the relation it has with population inversion. Finally, we address the problem of the observation of the radiation field, introducing physical detectors into the description of the emission. Notably, we show how to expose the quantumness of a radiation field that has been observed with a detector with finite spectral resolution, even if the observed Wigner function is completely positive.
description: 11 pages, 4 figures: Author Accepted Manuscript
title: Tests of Methods that Control Round-Off Error
Creators: name: Rasmuson, Dale M.
Publisher: name: Utah State University
Year: 1968

description: Methods of controlling round-off error in one-step methods in the numerical solution of ordinary differential equations are compared. A new Algorithm called theoretical cumulative rounding is formulated. Round-off error bounds are obtained for single precision, and theoretical cumulative rounding. Limits of these bounds are obtained as the step length approaches zero. It is shown that the limit of the bound on the round-off error is unbounded for single precision and double precision, is constant for theoretical partial double precision, and is zero for theoretical cumulative rounding.
The limits of round-off bounds are not obtainable in actual practice. The round-off error increases for single precision, remains about constant for partial double precision and decreases for cumulative rounding as the step length decreases. Several examples are included. (34 pages)
Universality class of epidemic percolation transitions driven by random walks
Creators: name: Feshanjerdi, Mohadeseh
name: Saberi, Abbas Ali
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Inspired by the recent viral epidemic outbreak and its consequent worldwide pandemic, we devise a model to capture the dynamics and the universality of the spread of such infectious diseases. The transition from a pre-critical to the post-critical phase is modeled by a percolation problem driven by random walks on a two-dimensional lattice with an extra average number $ρ$ of nonlocal links per site. Using the finite-size scaling analysis, we find that the effective exponents of the percolation transitions as well as the corresponding time thresholds, extrapolated to the infinite system size, are $ρ$-dependent. We argue that the $ρ$-dependence of our estimated exponents represents a crossover-type behavior caused by the finite-size effects between the two limiting regimes of the system. We also find that the universal scaling functions governing the critical behavior in every single realization of the model can be well described by the theory of extreme values for the maximum jumps in the order parameter and by the central limit theorem for the transition threshold.
description: 8 pages, 7 figures (to appear in Phys. Rev. E)
Spatially Resolved Stellar Populations of Eight GOODS-South AGN at z~1
Creators: name: Ammons, S. Mark
name: Melbourne, Jason
name: Max, Claire E.
name: Koo, David C.
name: Rosario, David J. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a pilot study of the stellar populations of 8 AGN hosts at z~1 and compare to (1) lower redshift samples and (2) a sample of nonactive galaxies of similar redshift. We utilize K' images in the GOODS South field obtained with the laser guide star adaptive optics (LGSAO) system at Keck Observatory. We combine this K' data with B, V, i, and z imaging from the ACS on HST to give multi-color photometry at a matched spatial resolution better than 100 mas in all bands. The hosts harbor AGN as inferred from their high X-ray luminosities (L_X > 10^42 ergs/s) or mid-IR colors. We find a correlation between the presence of younger stellar populations and the strength of the AGN, as measured with [OIII] line luminosity or X-ray (2-10 keV) luminosity. This finding is consistent with similar studies at lower redshift. Of the three Type II galaxies, two are disk galaxies and one is of irregular type, while in the Type I sample there only one disk-like source and four sources with smooth, elliptical/spheroidal morphologies. In addition, the mid-IR SEDs of the strong Type II AGN indicate that they are excited to LIRG (Luminous InfraRed Galaxy) status via galactic starbursting, while the strong Type I AGN are excited to LIRG status via hot dust surrounding the central AGN. This supports the notion that the obscured nature of Type II AGN at z~1 is connected with global starbursting and that they may be extincted by kpc-scale dusty features that are byproducts of this starbursting.
description: 56 pages, 39 figures, accepted to AJ
title: Algebraic Properties of Endomorphisms of Abelian Groups and Rings
Creators: name: Slagle, Johnnie George
Publisher: name: Utah State University
Year: 1968

description: The main objective of the thesis was to extend the definition of an M-Group to what is called an M-Ring. From this extension a system called an expanded ring follows naturally. To facilitate the development of the expanded ring, chapter I is devoted to developing properties on systems that are not quite rings where many interesting examples are constructed. In chapter II the definition of an M-Ring is given and some of its properties are derived. In chapter III some of the properties of expanded rings are proved, and examples of expanded rings are given to show their existence.
title: Origins of Low-Angle Normal Faults Along the West Side of the Bear River Range in Northern Utah
Creators: name: Brummer, Jon E.
Publisher: name: Utah State University
Year: 1991

description: This paper presents new interpretations of two normal-slip, low-angle faults near Smithfield and Richmond, Utah. The faults have previously been interpreted as landslides, gravity slides, slide blocks, and depositional contacts. Recent work in the Basin and Range province allows new interpretations concerning the origins of the low­-angle faults.
Working hypotheses used to interpret origins of the faults are classified as folded thrust fault, rotated high-angle normal fault, gravity slide, listric normal fault, and low-­angle normal fault Among these general categories are several subhypotheses. The evaluation of each hypothesis includes a description of the geologic requirements of the hypothesis, a comparison of field data to the requirements, and a conclusion regarding the hypothesis. Field maps, computer analyses of fault orientations, geophysical surveys, well logs, and published discussions of low-angle-fault origins provide the data base from which to derive conclusions.
The data best fit a low-angle-normal-fault hypothesis which states that low-angle normal faults in the study area represent a pre-Basin and Range style of extensional tectonism in which principal stress axes were in a transitional state between compressional tectonism and modern Basin and Range extensional tectonism. The northern low-angle normal fault formed as early as the late Eocene, followed by the southern low-angle normal fault in the early to middle Miocene(?). Episodes of high­-angle normal faulting followed formation of the southern low-angle normal fault. The faulting history indicates that two distinct stress states existed resulting in two different styles of normal faults.
Schematic cross-sectional reconstructions based on two other low-angle-normal­fault subhypotheses and the gravity-slide subhypothesis 2 indicated that these subhypotheses could be valid However, the two low-angle-normal-fault subhypotheses cannot account for transitional stress states, and the gravity-slide subhypothesis explains only the southern low-angle normal fault. On the basis of geologic simplicity, the best hypothesis should explain both low-angle faults because of their similarities in deformation, orientation, and age.
The applicability of the low-angle-normal-fault model to the rest of the Basin and Range province is somewhat limited. Too many local variables are involved to allow one model to be regionally applied. (112 pages)
Tidal effects on small bodies by massive black holes
Creators: name: Kostic, U.
name: Cadez, A.
name: Calvani, M.
name: Gomboc, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The compact radio source Sagittarius A (Sgr A) at the centre of our Galaxy harbours a supermassive black hole, whose mass has been measured from stellar orbital motions. Sgr A is therefore the nearest laboratory where super-massive black hole astrophysics can be tested, and the environment of black holes can be investigated. Since it is not an active galactic nucleus, it also offers the possibility of observing the capture of small objects that may orbit the central black hole. We study the effects of the strong gravitational field of the black hole on small objects, such as a comet or an asteroid. We also explore the idea that the flares detected in Sgr A might be produced by the final accretion of single, dense objects with mass of the order of 10^20 g, and that their timing is not a characteristic of the sources, but rather of the space-time of the central galactic black hole in which they are moving. We find that tidal effects are strong enough to melt the solid object, and present calculations of the temporal evolution of the light curve of infalling objects as a function of various parameters. Our modelling of tidal disruption suggests that during tidal squeezing, the conditions for synchrotron radiation can be met. We show that the light curve of a flare can be deduced from dynamical properties of geodesic orbits around black holes and that it depends only weakly on the physical properties of the source.
description: 10 pages, 14 figures, A&A accepted
Pulse radiolysis investigations of solvated electrons
Creators: name: Ulrich, Mary McKenney
Publisher: name: University of British Columbia
Year: 2010

description: The method of Cerenkov Reabsorption Spectroscopy has been used to measure the initial radiation yield of hydrated electrons. The amount of Cerenkov light that is absorbed by concurrently produced radiation products is measured, and can be related to the initial yield of the absorbing species through Beer's Law. The application of the law is not straightforward because of a complicated spatial dependence of both the light source and the concentration of the absorbing species. The problem was solved by (i) using the integrated form of Beer's Law with a correction factor for the spatial dependence of both the light production and the concentration of absorbers and (ii) applying the differential form of the law directly to analytical expressions for the two functions. An initial yield , independent of pH, of 4.0 ± 0.4 was determined for the hydrated electron. This value is discussed in relation to the various models for the radiolysis of water, and in relation to the concepts of presolvation scavenging and high concentration rate constants. The second part of this thesis deals with an attempt to detect chirality, either inherent or induced, on the part of solvated electrons through (i) their reaction with chiral molecules or (ii) their interaction with polarized light. The rate of reaction of solvated electrons with various chiral molecules was measured using the method of kinetic laser spectrophotometry. Computer analysis of the decay curves gave no evidence for species of different reactivity. Therefore, if chiral solvated electrons exist their rate constants in these instances must differ by less than 5% despite scavengers chosen such that the rate constants had a small activation energy and a relatively large preexponential factor. No shift in the plane of polarization as detected by crossed polarizers or difference in the absorption of right and left circularly polarized light by solvated electrons in a chiral solvent, a racemic solvent and a symmetric solvent doped with chiral molecules was observed.
Práticas info-comunicacionais, organizações e trabalho: Reflexões críticas da info-comunicação na sociedade
Creators: name: Caroline Delevati Colpo
Publisher: name: Zenodo
Year: 2023
Subjects: organizações
trabalho
comunicação
informação
sociedade

description: Este livro ­­­­está dividido em duas partes. A primeira parte, com 5 artigos, trata dos conceitos de trabalho, organizações e comunicação, apresentando discussões  teóricas e aplicação da teoria em casos específicos, sempre com a perspectiva crítica das relações de trabalho e da comunicação nos diferentes contextos de organizações. A reflexão crítica sobre o mundo do trabalho, diante da precarização, da flexibilização das relações de trabalho e das alterações na legislação trabalhista brasileira, precisa ser considerada por todas as organizações nas diferentes possibilidades de comunicação com seus empregados. A segunda parte do livro, com 6 artigos, aborda as práticas info-comunicacionais na sociedade e nas organizações, com textos que discutem as formas de circulação da informação e os processos de comunicação em diferentes contextos sociais e organizacionais. Os textos da segunda parte do livro demostram a necessidade de pensar as práticas de informação e os processos de comunicação nas relações sociais, tanto dentro, como fora de contextos organizacionais.
The Rotation of Janus and Epimetheus
Creators: name: Tiscareno, Matthew S.
name: Thomas, Peter C.
name: Burns, Joseph A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Epimetheus, a small moon of Saturn, has a rotational libration (an oscillation about synchronous rotation) of 5.9 +- 1.2 degrees, placing Epimetheus in the company of Earth's Moon and Mars' Phobos as the only natural satellites for which forced rotational libration has been detected. The forced libration is caused by the satellite's slightly eccentric orbit and non-spherical shape. Detection of a moon's forced libration allows us to probe its interior by comparing the measured amplitude to that predicted by a shape model assuming constant density. A discrepancy between the two would indicate internal density asymmetries. For Epimetheus, the uncertainties in the shape model are large enough to account for the measured libration amplitude. For Janus, on the other hand, although we cannot rule out synchronous rotation, a permanent offset of several degrees between Janus' minimum moment of inertia (long axis) and the equilibrium sub-Saturn point may indicate that Janus does have modest internal density asymmetries. The rotation states of Janus and Epimetheus experience a perturbation every four years, as the two moons "swap" orbits. The sudden change in the orbital periods produces a free libration about synchronous rotation that is subsequently damped by internal friction. We calculate that this free libration is small in amplitude (<0.1 degree) and decays quickly (a few weeks, at most), and is thus below the current limits for detection using Cassini images.
description: 18 pages, 6 figures; accepted to Icarus
title: Magnitude of Displacement and Styles of Deformation on the Paris and Laketown Thrust Faults, Northern Utah
Creators: name: Kendrick, Richard D.
Publisher: name: Utah State University
Year: 1994

description: Surface geology is combined with abundant industry seismic-reflection and drill­-hole data in the central Bear River Range and Bear Lake Plateau to depict the forms and interactions of the Paris-Woodruff-Willard, Laketown-Meade-Home Canyon, and Crawford thrust faults. Displacement on the Paris thrust diminished to the south, and died out in splays where displacement was transferred to the Willard thrust. West of Woodruff, Utah, splays of the Laketown thrust deformed a complex footwall imbricate of the Willard thrust. To the east, a major northeast-striking Crawford thrust splay exhibits a change in slip vectors from east to southeast. Reorientation of these slip vectors is recorded by an imbricate stack of thrusts in the Willard thrust footwall to the west. The sharp bend in the surface trace of the Crawford normal fault southeast of Randolph, Utah, reflects the separation of the south-southeast-trending surface traces of the Crawford thrust and this northeast-trending splay.
Cross sections indicate that the Sheep Creek thrust, a major splay off the basal decollement at the base of the Crawford thrust sheet, accommodated displacement during the transition from thrusting on the western thrust system (Paris-Woodruff-Willard, and Laketown-Meade-Home Canyon) to the structurally lower eastern thrust system (Crawford, Absaroka, and younger thrusts). The Sheep Creek thrust trends northeast and folded the Laketown thrust in the central Bear River Range. Shortening in the northeast part of the study area was accommodated by the Home Canyon thrust along a detachment in the Jurassic Twin Creek Limestone. Several splays from this thrust extensively folded the footwall of the Meade thrust and rocks of the Bear Lake Plateau, and thereby formed a series of hanging-wall anticlines that have been extensively drilled for hydrocarbons.
On the spatial distribution and the origin of hypervelocity stars
Creators: name: Lu, Youjun
name: Zhang, Fupeng
name: Yu, Qingjuan
Publisher: name: arXiv
Year: 2009
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Hypervelocity stars (HVSs) escaping away from the Galactic halo are dynamical products of interactions of stars with the massive black hole(s) (MBH) in the Galactic Center (GC). They are mainly B-type stars with their progenitors unknown. OB stars are also populated in the GC, with many being hosted in a clockwise-rotating young stellar (CWS) disk within half a parsec from the MBH and their formation remaining puzzles. In this paper, we demonstrate that HVSs can well memorize the injecting directions of their progenitors using both analytical arguments and numerical simulations, i.e., the ejecting direction of an HVS is almost anti-parallel to the injecting direction of its progenitor. Therefore, the spatial distribution of HVSs maps the spatial distribution of the parent population of their progenitors directly. We also find that almost all the discovered HVSs are spatially consistent with being located on two thin disk planes. The orientation of one plane is consistent with that of the (inner) CWS disk, which suggests that most of the HVSs originate from the CWS disk or a previously existed disk-like stellar structure with an orientation similar to it. The rest of HVSs may be correlated with the plane of the northern arm of the mini-spiral in the GC or the plane defined by the outer warped part of the CWS disk. Our results not only support the GC origin of HVSs but also imply that the central disk (or the disk structure with a similar orientation) should persist or be frequently rejuvenated over the past 200 Myr, which adds a new challenge to the stellar disk formation and provides insights to the longstanding problem of gas fueling into massive black holes.
description: 7 pages, 5 figures
title: The Tectonic Evolution of the Panther Creek Half-Graben in East-Central Idaho
Creators: name: Hammond, Brian F.
Publisher: name: Utah State University
Year: 1994

description: An integrated field, petrographic, structural, and geophysical analysis of the Panther Creek half-graben (PCHG), in east-central Idaho, was undertaken to determine its tectonic origin. Two competing theories as to the origin of the PCHG exist. One suggests that it formed as part of the TransChallis fault system (TCFS), a system of northeast-trending normal faults, eruptive centers, and graben that formed in Middle Eocene time. The graben of this system are bounded by northeast-striking normal faults, and show evidence of syn-tectonic deposition of basin-filling volcanic strata. The other theory suggests that the PCHG may have evolved as a result of a post-Challis volcanic extension event (Late Eocene to Early Oligocene). Graben of this event are bounded by NNW-striking normal faults, and Challis volcanic strata are uniformly tilted; this evidence suggests post-volcanic basin formation. This study demonstrates that formation of the PCHG was mostly synchronous with volcanism and that there was very little post-volcanic deformation.
Other conclusions of this research are 1) Rates of slip on basin-bounding faults were high, and slip was episodic. Slip occurred on both NE and NNW-striking faults, but more occurred on the NE-striking basin-bounding fault. This is consistent with the dominant NE strike of faults within the TCFS. 2) Most of the older volcanic units in the basin dip more steeply to the SE than overlying younger units, this is evidence for synvolcanic deposition. 3) There is significant hanging wall deformation in the form of folds and normal faults, particularly in the northern and southern portions of the basin. 4) Paleocurrents determined from provenance studies and imbricate fabric in exposed conglomerate beds indicate a flow direction largely to the northwest. This paleocurrent flow crosses the strike of the syn-extensional basin-filling units. 5) The composition of the clasts in the post-volcanic basin-fill deposits suggests that the thick volcanic units preserved in the basin never blanketed highlands NE, E, and SE of the basin and that the footwall of the basin-bounding fault system was the main source of sediment in the basin. 6) The magnetic and bouguer gravity surveys indicate a sizable intrusion (most likely related to the nearby Casto pluton) beneath the west-central portions of the basin. The intrusion(s) may be responsible for east-plunging folds in the tuff of Castle Rock. 7) Work initiated during this study to determine the 40Ar/39Ar incremental-release mineral ages and the polarity of the tuff of Castle Rock and the tuff of Challis Creek will help determine the relationship between these two units and will precisely date basin development. However, it is clear that the basin was nearly fully formed by the end of Challis volcanism.
Additional file 1 of Dapagliflozin: a sodium–glucose cotransporter 2 inhibitor, attenuates angiotensin II-induced cardiac fibrotic remodeling by regulating TGFβ1/Smad signaling
Creators: name: Zhang, Yuze
name: Lin, Xiaoyan
name: Chu, Yong
name: Chen, Xiaoming
name: Du, Heng
name: Zhang, Hailin
name: Xu, Changsheng
name: Xie, Hong
name: Ruan, Qinyun
name: Lin, Jinxiu
name: Liu, Jie
name: Zeng, Jinzhang
name: Ma, Ke
name: Chai, Dajun
Publisher: name: figshare
Year: 2021
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Developmental Biology
subject: Infectious Diseases
subject: FOS: Health sciences

description: Additional file 1: Table S1. The effect of DAPA on blood pressure detected by cardiac hemodynamic monitoring and non-invasive tail-cuff system respectively in normal and Ang II-infused rats treated with vehicle or DAPA.