cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Observation of Pull-in Instability in Graphene Membranes under Interfacial Forces
Creators: name: Liu, Xinghui
name: Boddeti, Narasimha G.
name: Szpunar, Mariah R.
name: Wang, Luda
name: Rodriguez, Miguel A.
name: Long, Rong
name: Xiao, Jianliang
name: Dunn, Martin L.
name: Bunch, J. Scott
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a unique experimental configuration that allows us to determine the interfacial forces on nearly parallel plates made from the thinnest possible mechanical structures, single and few layer graphene membranes. Our approach consists of using a pressure difference across a graphene membrane to bring the membrane to within ~ 10-20 nm above a circular post covered with SiOx or Au until a critical point is reached whereby the membrane snaps into adhesive contact with the post. Continuous measurements of the deforming membrane with an AFM coupled with a theoretical model allow us to deduce the magnitude of the interfacial forces between graphene and SiOx and graphene and Au. The nature of the interfacial forces at ~ 10 - 20 nm separations is consistent with an inverse fourth power distance dependence, implying that the interfacial forces are dominated by van der Waals interactions. Furthermore, the strength of the interactions is found to increase linearly with the number of graphene layers. The experimental approach can be used to measure the strength of the interfacial forces for other atomically thin two-dimensional materials, and help guide the development of nanomechanical devices such as switches, resonators, and sensors.
description: To appear in Nano Letters
Impact of an accurate modeling of primordial chemistry in high resolution studies
Creators: name: Bovino, S.
name: Grassi, T.
name: Latif, M. A.
name: Schleicher, D. R. G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The formation of the first stars in the Universe is regulated by a sensitive interplay of chemistry and cooling with the dynamics of a self-gravitating system. As the outcome of the collapse and the final stellar masses depend sensitively on the thermal evolution, it is necessary to accurately model the thermal evolution in high resolution simulations. As previous investigations raised doubts regarding the convergence of the temperature at high resolution, we investigate the role of the numerical method employed to model the chemistry and the thermodynamics. Here we compare the standard implementation in the adaptive-mesh refinement code \verb|ENZO|, employing a first order backward differentiation formula (BDF), with the 5th order accurate BDF solver \verb|DLSODES|. While the standard implementation in \verb|ENZO| shows a strong dependence on the employed resolution, the results obtained with \verb|DLSODES| are considerably more robust, both with respect to the chemistry and thermodynamics, but also for dynamical quantities such as density, total energy or the accretion rate. We conclude that an accurate modeling of the chemistry and thermodynamics is central for primordial star formation.
description: accepted by MNRAS Letters
Finite-width effects in unstable-particle production at hadron colliders
Creators: name: Falgari, P.
name: Papanastasiou, A. S.
name: Signer, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a general formalism for the calculation of finite-width contributions to the differential production cross sections of unstable particles at hadron colliders. In this formalism, which employs an effective-theory description of unstable-particle production and decay, the matrix element computation is organized as a gauge-invariant expansion in powers of $Γ_X/m_X$, with $Γ_X$ and $m_X$ the width and mass of the unstable particle. This framework allows for a systematic inclusion of off-shell and non-factorizable effects whilst at the same time keeping the computational effort minimal compared to a full calculation in the complex-mass scheme. As a proof-of-concept example, we give results for an NLO calculation of top-antitop production in the $q \bar{q}$ partonic channel. As already found in a similar calculation of single-top production, the finite-width effects are small for the total cross section, as expected from the na\" ive counting $\sim Γ_t/m_t \sim 1%$. However, they can be sizeable, in excess of 10%, close to edges of certain kinematical distributions. The dependence of the results on the mass renormalization scheme, and its implication for a precise extraction of the top-quark mass, is also discussed.
description: 41 pages, 18 figures, 2 tables
Ownership and Control of Resources by Minorities and Small Farmers in the South
Creators: name: Lewis, James A.
name: Lewis, James A.
Publisher: name: Unknown
Year: 1976
Subjects: Farm Management
Labor and Human Capital
Land Economics/Use
Research Methods/ Statistical Methods

description: Small farm operators in the South owned about 20 percent of farm land in 1909. They operated over 15 percent of the land in farms and held over 18 percent of the value of land and buildings in addition to about 19 percent of market value of machinery and equipment. These same small farmers represented 49 percent of all farm operators yet they contributed less than 4 percent of farm product sales. Although their importance in the market place as measured by farm sales is negligible they do own and control a significant share of the farm resources. As decisionmakers about resource use and allocation, both human and physical, they should command a share of the research communities attention, and appropriate weight in planning and policy regarding resources. This paper emphasizes the importance of small farmers and identifies differences by race from the perspective of equality of ownership and control. Minorities do not own or control as much as do whites. However there are significant relative differences by race and minority small farmers hold a larger portion of all minority owned and controlled resources than do white small farmers. Research directed at policy, programs, problems, status, and perspectives on and about resources should account for differences between all resource owners. Making such distinctions would enhance the capability of analysis to identify and evaluate distributional effects of public policies and programs.
description: An earlier draft of this paper was presented at a meeting of the North Central Regional Research Strategy Committee on Natural Resource Development, Oct. 16 and 17, 1975, Madison, Wisc.
Bouncing Anisotropic Universes with Varying Constants
Creators: name: Barrow, John D.
name: Sloan, David
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We examine the evolution of a closed, homogeneous and anisotropic cosmology subject to a variation of the fine structure 'constant', α, within the context of the theory introduced by Bekenstein, Sandvik, Barrow and Magueijo, which generalises Maxwell's equations and general relativity. The variation of αpermits an effective ghost scalar field, whose negative energy density becomes dominant at small length scales, leading to a bouncing cosmology. A thermodynamically motivated coupling which describes energy exchange between the effective ghost field and the radiation field leads to an expanding, isotropizing sequence of bounces. In the absence of entropy production we also find solutions with stable anisotropic oscillations around a static universe.
description: 9 pages, 5 figures
CLINICAL EVALUATION OF TIBIAL SHAFT FRACTURES IN PATIENTS AT AL-HUSSEIN TEACHING HOSPITAL
Creators: name: Ahmad R, . Al-Jabiri
name: Samir A., Al-Mansoori
Publisher: name: AYDEN JOURNAL
Year: 2024
Subjects: Tibial shaft, Tibial shaft fracture, Mechanism of injury, Injury severity, Associated injuries, Mortality

description: This study was conducted on 50 patients with fracture of tibia from 15 October, 2023 to 22 February 2024 at Al-Hussein teaching hospital, Al-Muthanna, Iraq 56% male and 44 % female. All patients sent for imaging such as plain x- ray CT or MRI. We study the age, sex, the cause, severity, type, site, shape of fracture, and the fracture displacement. The aim of this study is to know the associated factors with fracture of tibia, the methods of treatment and outcome of treatment.
Transport signatures of spatially modulated electronic nematic phases
Creators: name: Kee, Hae-Young
name: Puetter, Christoph M.
name: Stroud, David
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Electronic nematic phases are broadly characterized by spontaneously broken rotational symmetry. Although they have been widely recognized in the context of high temperature cuprates, bilayer ruthenates, and iron-based superconductors, the focus so far has been exclusively on the uniform nematic phase. Recently, however, it was proposed that on a square lattice a nematic instability in the d-wave charge channel could lead to a spatially modulated nematic state, where the modulation vector q is determined by the relative location of the Fermi level to the van Hove singularity. Interestingly, this finite-q nematic phase has also been identified as an additional leading instability that is as strong as the superconducting instability near the onset of spin density wave order. Here we study the electrical conductivity tensor in the modulated nematic phase for a general modulation vector. Our results can be used to identify modulated nematic phases in correlated materials.
description: 6 pages, 3 figures
Cosmic-ray propagation in molecular clouds
Creators: name: Padovani, Marco
name: Galli, Daniele
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Cosmic-rays constitute the main ionising and heating agent in dense, starless, molecular cloud cores. We reexamine the physical quantities necessary to determine the cosmic-ray ionisation rate (especially the cosmic ray spectrum at E < 1 GeV and the ionisation cross sections), and calculate the ionisation rate as a function of the column density of molecular hydrogen. Available data support the existence of a low-energy component (below about 100 MeV) of cosmic-ray electrons or protons responsible for the ionisation of diffuse and dense clouds. We also compute the attenuation of the cosmic-ray flux rate in a cloud core taking into account magnetic focusing and magnetic mirroring, following the propagation of cosmic rays along flux tubes enclosing different amount of mass and mass-to-flux ratios. We find that mirroring always dominates over focusing, implying a reduction of the cosmic-ray ionisation rate by a factor of 3-4 depending on the position inside the core and the magnetisation of the core.
description: To appear in "Cosmic Rays in Star-Forming Environments", Proceedings of the 2nd Session of the Sant Cugat Forum on Astrophysics. D. F. Torres and O. Reimer (Editors), 2013, Springer, 25 pages, 11 figures
How to construct a gravitating quantum electron star
Creators: name: Allais, Andrea
name: McGreevy, John
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Motivated by the holographic study of Fermi surfaces, we develop methods to solve Einstein gravity coupled to fermions and gauge fields, with AdS boundary conditions and a chemical potential.
description: 47 pages, 7 figures
Mixtures of foam and paste: suspensions of bubbles in yield stress fluids
Creators: name: Kogan, Michael
name: Ducloué, Lucie
name: Goyon, Julie
name: Chateau, Xavier
name: Pitois, Olivier
name: Ovarlez, Guillaume
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the rheological behavior of mixtures of foams and pastes, which can be described as suspensions of bubbles in yield stress fluids. Model systems are designed by mixing monodisperse aqueous foams and concentrated emulsions. The elastic modulus of the suspensions decreases with the bubble volume fraction. This decrease is all the sharper as the elastic capillary number (defined as the ratio of the paste elastic modulus to the bubble capillary pressure) is high, which accounts for the softening of the bubbles as compared to the paste. By contrast, the yield stress of most studied materials is not modified by the presence of bubbles. Their plastic behavior is governed by the plastic capillary number, defined as the ratio of the paste yield stress to the bubble capillary pressure. At low plastic capillary number values, bubbles behave as nondeformable inclusions, and we predict that the suspension dimensionless yield stress should remain close to unity. At large plastic capillary number values, we observe bubble breakup during mixing: bubbles are deformed by shear. Finally, at the highest bubble volume fractions, the yield stress increases abruptly: this is interpreted as a 'foamy yield stress fluid' regime, which takes place when the paste mesoscopic constitutive elements are strongly confined in the films between the bubbles.
Enhancing the Admissibility of Live Box Data Capture in Digital Forensics: Creation of the Live Box Computer Preservation Response (LBCPR) and Comparative Study Against Dead Box Data Acquisition
Creators: name: Mancilla, Emilia
Publisher: name: Purdue University Graduate School
Year: 2022
Subjects: Digital forensics

description: There are several techniques and methods on how to capture data during a Live Box response in computer forensics, but the key towards these acquisitions is to keep the collected data admissible in a judicial court process. Different approaches during a Live Box examination will lead to data changes in the computer, due to the volatile nature of data stored in memory. The inevitable changes of volatile data are what cause the controversy when admitting digital evidence to court room proceedings. The main goal of this dissertation was to create a process model, titled Live Box Computer Preservation Response(LBCPR), that would assist in ensuing validity, reliably and accuracy of evidence in a court of law. This approach maximizes the admissibly of digital data derived from a Live Box response. The LBCPR was created to meet legal and technical requirements in acquiring data from a live computer. With captured Live Box computer data, investigators can further add value to their investigation when processing and analyzing the captured data set, that would have otherwise been permanently unrecoverable upon powering down the machine. By collecting the volatile data prior to conducting Dead Box forensics, there is an increased amount of information that that can be a utilized to understand the state of the machine upon collection when combined with the stored data contents. This study created a comparative analysis on data collection with the LBCPR method versus traditional Dead Box forensics techniques, further proving the expected results of Live Box techniques capturing volatile data. However, due to the structure of the LBCPR, there were enhanced capabilities of obtaining value from the randomization of memory dumps, because of the assistance of the collected logs in the process model. In addition, with the legal admissibility focus, there was incorporation of techniques to keep data admissible in a court of law.
Colocalization of coregulated genes: a steered molecular dynamics study of human chromosome 19
Creators: name: Di Stefano, Marco
name: Rosa, Angelo
name: Belcastro, Vincenzo
name: di Bernardo, Diego
name: Micheletti, Cristian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Genomics (q-bio.GN)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The connection between chromatin nuclear organization and gene activity is vividly illustrated by the observation that transcriptional coregulation of certain genes appears to be directly influenced by their spatial proximity. This fact poses the more general question of whether it is at all feasible that the numerous genes that are coregulated on a given chromosome, especially those at large genomic distances, might become proximate inside the nucleus. This problem is studied here using steered molecular dynamics simulations in order to enforce the colocalization of thousands of knowledge-based gene sequences on a model for the gene-rich human chromosome 19. Remarkably, it is found that most (~80%) gene pairs can be brought simultaneously into contact. This is made possible by the low degree of intra-chromosome entanglement and the large number of cliques in the gene coregulatory network, that is the many groups of genes that are all mutually coregulated. The constrained conformations for the model chromosome 19 are further shown to be organised in spatial macrodomains that are similar to those inferred from recent HiC measurements. The findings indicate that gene coregulation and colocalization are largely compatible and that this relationship can be exploited to draft the overall spatial organization of the chromosome in vivo. The more general validity and implications of these findings could be investigated by applying to other eukaryotic chromosomes the general and transferable computational strategy introduced here.
description: 24 pages, 11 figures, Accepted for publication in PLoS Computational Biology
NOON states in trapped ions
Creators: name: Rodríguez-Méndez, D.
name: Moya-Cessa, H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show how NOON states may be generated in ion traps. We use the individual interaction of light with each of two vibrational modes of the ion to entangle them. This allows us to generate NOON states with N=8.
Supplementary_Figures_Wilmink curve on protein profile.pdf
Creators: name: Amalfitano, Nicolo'
Publisher: name: figshare
Year: 2021
Subjects: subject: 70299 Animal Production not elsewhere classified
subject: FOS: Animal and dairy science

description: Supplementary Figures of the paper "Nonlinear modeling to describe the pattern of 15 milk protein and nonprotein compounds over lactation in dairy cows"
Quantum dilogarithm identities and cyclic quivers
Creators: name: Fu, Changjian
name: Peng, Liangang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Rings and Algebras (math.RA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 16G20, 16G99

description: We study quantum dilogarithm identities for cyclic quivers following Reineke's idea via Ringel-Hall algebra approach. For any given discrete stability function for the cyclic quiver $Δ_n$ with $n$ vertices, we obtain certain cyclic quantum dilogarithm identities of order $n$ in the sense of Bytsko and Volkov.
description: 11 pages
An Asteroid Belt Interpretation for the Timing Variations of the Millisecond Pulsar B1937+21
Creators: name: Shannon, R. M.
name: Cordes, J. M.
name: Metcalfe, T. S.
name: Lazio, T. J. W.
name: Cognard, I.
name: Desvignes, G.
name: Janssen, G. H.
name: Jessner, A.
name: Kramer, M.
name: Lazaridis, K.
name: Purver, M. B.
name: Stappers, B. W.
name: Theureau, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Pulsar timing observations have revealed companions to neutron stars that include other neutron stars, white dwarfs, main-sequence stars, and planets. We demonstrate that the correlated and apparently stochastic residual times of arrival from the millisecond pulsar B1937+21 are consistent with the signature of an asteroid belt having a total mass less than approximately 0.05 Earth masses. Unlike the solar system's asteroid belt, the best fit pulsar asteroid belt extends over a wide range of radii, consistent with the absence of any shepherding companions. We suggest that any pulsar that has undergone accretion-driven spin-up and subsequently evaporated its companion may harbor orbiting asteroid mass objects. The resulting timing variations may fundamentally limit the timing precision of some of the other millisecond pulsars. Observational tests of the asteroid belt model include identifying periodicities from individual asteroids, which are difficult; testing for statistical stationarity that become possible when observations are conducted over a longer observing span; and searching for reflected radio emission.
description: 15 pages, 5 figures, accepted to the Astrophysical Journal
COVID-19 Hospitalization, Mortality, and Violence: Women’s Circumstances in the Context of the Pandemic in Brazil
Creators: name: de Azevedo Queiroz, Franciane
name: de Araújo, Edna Maria
name: Nisida, Vitor Coelho
name: do Carmo Luiz, Olinda
name: de Souza, Ionara Magalhães
name: Pereira, Sheila Regina
name: Vasconcelos, Rafael Souza
name: Cavalcante, Lara Aguiar
name: da Silva Filho, Aloísio Machado
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2023

description: This study outlines the rates of hospitalization, mortality, and violence for women in Brazil in the
context of the COVID-19 pandemic, according to race/skin color/ethnicity. The study was
developed with secondary data originating from official systems of information. The analysis of
hospitalizations derives from data found in the Influenza Epidemiological Surveillance Information
System (SIVEP-Gripe). The data on women’s mortality due to COVID-19 and violence was
obtained from Mortality Information System (SIM), with consideration for the International
Classification of Disease codes (ICD-10). Averages, proportions, gross rates, adjusted rates, and rate
ratios were calculated by the authors. Of the COVID-19-related hospitalizations, the majority of
those registered occurred among women 50 or older, with an average age of 58.8 years. A higher
number of hospitalizations was observed among white women, especially those with at least a
primary and middle school education. COVID-19 deaths and violent deaths from undetermined
causes (UD) were proportionately higher for women over 50 years old. Deaths by homicide were
proportionately higher for girls and women 10 to 49 years old. The average age at the time of death
was found to be approximately 69 years old by COVID-19, 34 by homicide, and 62 by UD. Deaths
due to COVID-19 and UD were more prevalent among white women, whereas deaths by homicide
were proportionately higher for Black women. Women with a basic education were more frequent
victims of COVID-19, homicide, and UD. In terms of hospitalization and death by COVID-19 and
UD, a higher adjusted rate was observed for Black women compared to white women. Indigenous
women represented the highest adjusted rate in terms of homicide, followed by Black women.
Despite white women experiencing proportionately higher hospitalizations and deaths from
COVID-19 and UD, the adjusted rates reveal that Black women are most at risk of sickness and
death from these causes.
Psara stultalis
Creators: name: Swezey, O. H.
Publisher: name: Zenodo
Year: 1942
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Crambidae
Psara
Psara stultalis

description: 39.Psara stultalis (Walker). Botys stultalis Walker, List Lep. Ins. Brit. Mus. 18: 669, 1859. Pachyzancla stultalis, Hampson, Fauna Brit. India, Moths 4: 405, 1896; Meyrick, B. P. Bishop Mus., Bull. 114: 340, 1934. Psara stultalis, Tams, Ins. Samoa 3 (4): 286, 1935. This moth has much the same distribution as the preceding species including Samoa and the Marquesas. The only two specimens obtained in Guam were reared from leafroller caterpillars on agal1mde,or a similar plant, Barrigada, Aug. 28, Swezey.
description: Published as part of Swezey, O. H., 1946, Lepidoptera, Geometridae, Arctiidae, Agrotidae, and Pyralidae of Guam, pp. 163-185 in Insects of Guam II, Honolulu, Hawaii :Bernice P. Bishop Museum Bulletin 189 on page 184, DOI: 10.5281/zenodo.5165313
A note on QUBO instances defined on Chimera graphs
Creators: name: Dash, Sanjeeb
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Data Structures and Algorithms (cs.DS)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: 90C05, 90C11, 90C20, 90C57

description: McGeoch and Wang (2013) recently obtained optimal or near-optimal solutions to some quadratic unconstrained boolean optimization (QUBO) problem instances using a 439 qubit D-Wave Two quantum computing system in much less time than with the IBM ILOG CPLEX mixed-integer quadratic programming (MIQP) solver. The problems studied by McGeoch and Wang are defined on subgraphs -- with up to 439 nodes -- of Chimera graphs. We observe that after a standard reformulation of the QUBO problem as a mixed-integer linear program (MILP), the specific instances used by McGeoch and Wang can be solved to optimality with the CPLEX MILP solver in much less time than the time reported in McGeoch and Wang for the CPLEX MIQP solver. However, the solution time is still more than the time taken by the D-Wave computer in the McGeoch-Wang tests.
description: Version 1 discussed computational results with random QUBO instances. McGeoch and Wang made an error in describing the instances they used; they did not use random QUBO instances but rather random Ising Model instances with fields (mapped to QUBO instances). The current version of the note reports on tests with the precise instances used by McGeoch and Wang
Acceleration with Self-Injection for an All-Optical Radiation Source at LNF
Creators: name: Gizzi, L. A.
name: Anania, M. P.
name: Gatti, G.
name: Giulietti, D.
name: Grittani, G.
name: Kando, M.
name: Krus, M.
name: Labate, L.
name: Levato, T.
name: Oishi, Y.
name: Rossi, F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We discuss a new compact gamma-ray source aiming at high spectral density, up to two orders of magnitude higher than currently available bremsstrahlung sources, and conceptually similar to Compton Sources based on conventional linear accelerators. This new source exploits electron bunches from laser-driven electron acceleration in the so-called self-injection scheme and uses a counter-propagating laser pulse to obtain X and gamma-ray emission via Thomson/Compton scattering. The proposed experimental configuration inherently provides a unique test-bed for studies of fundamental open issues of electrodynamics. In view of this, a preliminary discussion of recent results on self-injection with the FLAME laser is also given.
description: 8 pages, 10 figures, 44 references - Channeling 2012 conference
Chemical surface inhomogeneities in late B-type stars with Hg and Mn peculiarity I Spot evolution in HD 11753 on short and long time scales
Creators: name: Korhonen, H.
name: Gonzalez, J. F.
name: Briquet, M.
name: Soriano, M. Flores
name: Hubrig, S.
name: Savanov, I.
name: Hackman, T.
name: Ilyin, I. V.
name: Eulaers, E.
name: Pessemier, W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Aims: Time series of high-resolution spectra of the late B-type star HD 11753 exhibiting HgMn chemical peculiarity are used to study the surface distribution of different chemical elements and their temporal evolution. Methods: High-resolution and high signal-to-noise ratio spectra were obtained using the CORALIE spectrograph at La Silla in 2000, 2009, and 2010. Surface maps of YII, SrII, TiII, and CrII were calculated using the Doppler imaging technique. The results were also compared to equivalent width measurements. The evolution of chemical spots both on short and long time scales were investigated. Results: We determine the binary orbit of HD 11753 and fine-tune the rotation period of the primary. The earlier discovered fast evolution of the chemical spots is confirmed by an analysis using both the chemical spot maps and equivalent width measurements. In addition, a long-term decrease in the overall YII and SrII abundances is discovered. A detailed analysis of the chemical spot configurations reveals some possible evidence that a very weak differential rotation is operating in HD 11753.
description: 21 pages, 23 figures, accepted for publication in A&A
Diasemia accalis Walker
Creators: name: Swezey, O. H.
Publisher: name: Zenodo
Year: 1942
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Crambidae
Diasemia
Diasemia accalis

description: 40. *Diasemia accalis Walker, Cat. 19: 1015, 1859; Hampson, Fauna Br.it. India, Moths 4: 411, 1896. One specimen reared from fruit of Barringtonia speciosa, Tumon, May 30, Swezey. Recorded from Shanghai, Dharmsala, and Burma.
description: Published as part of Swezey, O. H., 1946, Lepidoptera, Geometridae, Arctiidae, Agrotidae, and Pyralidae of Guam, pp. 163-185 in Insects of Guam II, Honolulu, Hawaii :Bernice P. Bishop Museum Bulletin 189 on page 184, DOI: 10.5281/zenodo.5165313
Some Bernstein functions and integral representations concerning harmonic and geometric means
Creators: name: Qi, Feng
name: Zhang, Xiao-Jing
name: Li, Wen-Hui
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: Primary 26E60, Secondary 26A48, 30E20, 44A10

description: It is general knowledge that the harmonic mean $H(x,y)=\frac2{\frac1x+\frac1y}$ and that the geometric mean $G(x,y)=\sqrt{xy}\,$, where $x$ and $y$ are two positive numbers. In the paper, the authors show by several approaches that the harmonic mean $H_{x,y}(t)=H(x+t,y+t)$ and the geometric mean $G_{x,y}(t)=G(x+t,y+t)$ are all Bernstein functions of $t\in(-\min\{x,y\},\infty)$ and establish integral representations of the means $H_{x,y}(t)$ and $G_{x,y}(t)$.
description: 19 pages
A simulation Method for Network Performability Estimation using Heuristically-computed Pathsets and Cutsets
Creators: name: Sartor, Pablo
name: Robledo, Franco
Publisher: name: arXiv
Year: 2013
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Consider a set of terminal nodes K that belong to a network whose nodes are connected by links that fail independently with known probabilities. We introduce a method for estimating any performability measure that depends on the hop distance between terminal nodes. It generalises previously introduced Monte Carlo methods for estimation of the K-reliability of networks with variance reduction compared to crude Monte Carlo. They are based on using sets of edges named d-pathsets and d-cutsets for reducing the variance of the estimator. These sets of edges, considered as a priori known in previous literature, heaviliy affect the attained performance; we hereby introduce and compare a family of heuristics for their selection. Numerical examples are presented, showing the significant efficiency improvements that can be obtained by chaining the edge set selection heuristics to the proposed Monte Carlo sampling plan.
0-Hecke algebra action on the Stanley-Reisner ring of the Boolean algebra
Creators: name: Huang, Jia
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: We define an action of the 0-Hecke algebra of type A on the Stanley-Reisner ring of the Boolean algebra. By studying this action we obtain a family of multivariate noncommutative symmetric functions, which specialize to the noncommutative Hall-Littlewood symmetric functions and their (q,t)-analogues introduced by Bergeron and Zabrocki, and to a more general family of noncommutative symmetric functions having parameters associated with paths in binary trees introduced recently by Lascoux, Novelli, and Thibon. We also obtain multivariate quasisymmetric function identities, which specialize to results of Garsia and Gessel on generating functions of multivariate distributions of permutation statistics.
description: Added connections with a family of noncommutative symmetric functions introduced recently by Lascoux, Novelli, and Thibon
Noether and Lie symmetries for charged perfect fluids
Creators: name: Kweyama, M. C.
name: Govinder, K. S.
name: Maharaj, S. D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the underlying nonlinear partial differential equation that governs the behaviour of spherically symmetric charged fluids in general relativity. We investigate the conditions for the equation to admit a first integral or be reduced to quadratures using symmetry methods for differential equations. A general Noether first integral is found. We also undertake a comprehensive group analysis of the underlying equation using Lie point symmetries. The existence of a Lie symmetry is subject to solving an integro-differential equation in general; we investigate the conditions under which it can be reduced to quadratures. Earlier results for uncharged fluids and particular first integrals for charged matter are regained as special cases of our treatment.
description: 17 pages, To appear in Class. Quantum Grav
Extending multiple histogram reweighting to a continuous lattice spin system exhibiting a first order phase transition
Creators: name: Sinha, Suman
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present extensive Monte Carlo simulations on a two-dimensional XY model with a modified form of interaction potential. Thermodynamic quantities other than energy, specific heat etc (such as magnetization, susceptibility, fourth order cumulant of magnetization) are obtained using multiple-histogram reweighting of the data obtained from the simulations. We employ an approach which eliminates the need to construct two-dimensional histograms. This approach makes judicious use of computer memory as well as CPU time. Lee-kosterlitz's method of finite size scaling for a first order transition and analysis using Binder's cumulant method allow us to make an accurate determination of the transition temperature.
description: 4 pages (in double column), 6 figures, Published in Phys. Rev. E 87, 054102 (2013)
Procedures for Projecting Rural Water Use in the Chesapeake Bay Area
Creators: name: Helman, Mark A.
name: Helman, Mark A.
Publisher: name: Unknown
Year: 1976
Subjects: subject: Crop Production/Industries
subject: Land Economics/Use
subject: Livestock Production/Industries
subject: Productivity Analysis
subject: Research Methods/ Statistical Methods
subject: Resource /Energy Economics and Policy
subject: rural water use
subject: domestic
subject: agricultural
subject: projections
subject: Chesapeake Bay
subject: Spillman

description: This report documents the procedure and results of the projection of water use in the Chesapeake Bay Study Area, an area which encompasses fifty-six counties from the states of Delaware, Maryland, and Virginia. The study was done for the Baltimore District Corps of Engineers, which is formulating long-term water and land management plans for the area, and it follows their existing conditions report. Aspects of the water demand considered were agricultural and rural domestic water needs. In the process of formulating agricultural demand, projections were made of crop production, from which the Soil Conservation Service estimated irrigation demands, and of livestock production. Average size farms and farm population were estimated in the projection of rural domestic demand. A Spillman type procedure was used for most of the projections, and OBERS state projections were used wherever possible as control totals. The counties were grouped into fifteen subareas, and projections were made at the subarea level.
Scrambling with Matrix Black Holes
Creators: name: Brady, Lucas
name: Sahakian, Vatche
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: If black holes are not to be dreaded syncs of information but be fully described by unitary evolution, they must scramble in-falling data and eventually leak it through Hawking radiation. Sekino and Susskind have conjectured that black holes are fast scramblers: they generate entanglement at a remarkably efficient rate, with characteristic time scaling logarithmically with the entropy. In this work, we focus on Matrix theory -- M theory in the light-cone frame -- and directly probe the conjecture. We develop a concrete test bed for quantum gravity using the fermionic variables of Matrix theory and show that the problem becomes that of chains of qubits with an intricate network of interactions. We demonstrate that the black hole system evolves much like a Brownian quantum circuit, with strong indications that it is indeed a fast scrambler. We also analyze the Berenstein-Maldacena-Nastase model and reach the same tentative conclusion.
description: 36 pages, 9 figures; v2: citations added
New shear-free relativistic models with heat flow
Creators: name: Msomi, A. M.
name: Govinder, K. S.
name: Maharaj, S. D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study shear-free spherically symmetric relativistic models with heat flow. Our analysis is based on Lie's theory of extended groups applied to the governing field equations. In particular, we generate a five-parameter family of transformations which enables us to map existing solutions to new solutions. All known solutions of Einstein equations with heat flow can therefore produce infinite families of new solutions. In addition, we provide two new classes of solutions utilising the Lie infinitesimal generators. These solutions generate an infinite class of solutions given any one of the two unknown metric functions.
description: 10 pages, To appear in Gen. Relativ. Gravit
A new proof of the geometric-arithmetic mean inequality by Cauchy's integral formula
Creators: name: Qi, Feng
name: Zhang, Xiao-Jing
name: Li, Wen-Hui
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: Primary 26E60, 30E20, Secondary 26A48, 44A20

description: Let $a=(a_1,a_2,...c,a_n)$ for $n\in\mathbb{N}$ be a given sequence of positive numbers. In the paper, the authors establish, by using Cauchy's integral formula in the theory of complex functions, an integral representation of the principal branch of the geometric mean {equation*} G_n(a+z)=\Biggl[\prod_{k=1}^n(a_k+z)\Biggr]^{1/n} {equation*} for $z\in\mathbb{C}\setminus(-\infty,-\min\{a_k,1\le k\le n\}]$, and then provide a new proof of the well known GA mean inequality.
description: 5 pages
Physics of Gluon Helicity Contribution to Proton Spin
Creators: name: Ji, Xiangdong
name: Zhang, Jian-Hui
name: Zhao, Yong
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The total gluon helicity in a polarized proton, measurable in high-energy scattering, is shown to be the large momentum limit of a gauge-invariant but non-local, frame-dependent gluon spin $\vec{E}\times \vec{A}_\perp$ in QCD. This opens a door for a non-perturbative calculation of this quantity in lattice QCD, and also justifies using free-field expressions in the light-cone gauge as physical observables.
description: 7 pages, 1 figure
The influence of changes in water content on the electrical resistivity of a natural unsaturated loess
Creators: name: Munoz-Castelblanco, José
name: Pereira, Jean-Michel
name: Delage, Pierre
name: Cui, Yu Jun
Publisher: name: arXiv
Year: 2013
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Non-destructive methods of measuring water content in soils have been extensively developed in the last decades, especially in soil science. Among these methods, the measurements based on the electrical resistivity are simple and reliable thanks to the clear relationship between the water content and the electrical resistivity of soils. In this work, a new electrical resistivity probe was developed to monitor the change in local water content in the triaxial apparatus. The probe is composed of two-pair of electrodes, and an electrical current is induced through the soil at the vicinity of the contact between the probe and the specimen. Some experimental data on the changes in resistivity with the degree of saturation were obtained in specimens of a natural unsaturated loess from Northern France. Two theoretical models of resistivity were also used to analyze the obtained data. Results are finally discussed with respect to the loess's water retention properties.
Three-coloring triangle-free planar graphs in linear time
Creators: name: Dvorak, Zdenek
name: Kawarabayashi, Ken-ichi
name: Thomas, Robin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Grotzsch's theorem states that every triangle-free planar graph is 3-colorable. Several relatively simple proofs of this fact were provided by Thomassen and other authors. It is easy to convert these proofs into quadratic-time algorithms to find a 3-coloring, but it is not clear how to find such a coloring in linear time (Kowalik used a nontrivial data structure to construct an O(n log n) algorithm). We design a linear-time algorithm to find a 3-coloring of a given triangle-free planar graph. The algorithm avoids using any complex data structures, which makes it easy to implement. As a by-product we give a yet simpler proof of Grotzsch's theorem.
description: 22 pages
Growth of a Protostar and a Young Circumstellar Disk with High Mass Accretion Rate onto the Disk
Creators: name: Ohtani, Takuya
name: Tsuribe, Toru
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The growing process of both a young protostar and a circumstellar disk is investigated. Viscous evolution of a disk around a single star is considered with a model where a disk increases its mass by dynamically accreting envelope and simultaneously loses its mass via viscous accretion onto the central star. We focus on the circumstellar disk with high mass accretion rate onto the disk $\dot{M}=8.512c_{\rm s}^3/G$ as a result of dynamical collapse of rotating molecular cloud core. We study the origin of the surface density distribution and the origin of the disk-to-star mass ratio by means of numerical calculations of unsteady viscous accretion disk in one-dimensional axisymmetric model. It is shown that the radial profiles of the surface density $Σ$, azimuthal velocity $v_ϕ$, and mass accretion rate $\dot{M}$ in the inner region approach to the quasi-steady state. Profile of the surface density distribution in the quasi-steady state is determined as a result of angular momentum transport rather than its original distribution of angular momentum in the cloud core. It is also shown that the disk mass becomes larger than the central star in the long time limit as long as temporary constant mass flux onto the disk is assumed. After the mass infall rate onto the disk declines owing to the depletion of the parent cloud core, the disk-to-star mass ratio $M_{\rm disk}/M_*$ decreases. The disk-to-star mass ratio becomes smaller than unity after $t> 10^5 \rm yr$ and $t>10^6 \rm yr$ from the beginning of the accretion phase in the case with $α_0 =1 {\rm and} 0.1$, respectively, where $α_0 $ is the constant part of viscous parameter. In the case with $α_0 \leq 10^{-2}$, $M_{\rm disk}/M_*$ is still larger than unity at $2 \rm Myr$ from the beginning of the accretion phase.
description: 22 pages, 7 figures. Accepted for publication in PASJ
Evaluation Measures for Hierarchical Classification: a unified view and novel approaches
Creators: name: Kosmopoulos, Aris
name: Partalas, Ioannis
name: Gaussier, Eric
name: Paliouras, Georgios
name: Androutsopoulos, Ion
Publisher: name: arXiv
Year: 2013
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Hierarchical classification addresses the problem of classifying items into a hierarchy of classes. An important issue in hierarchical classification is the evaluation of different classification algorithms, which is complicated by the hierarchical relations among the classes. Several evaluation measures have been proposed for hierarchical classification using the hierarchy in different ways. This paper studies the problem of evaluation in hierarchical classification by analyzing and abstracting the key components of the existing performance measures. It also proposes two alternative generic views of hierarchical evaluation and introduces two corresponding novel measures. The proposed measures, along with the state-of-the art ones, are empirically tested on three large datasets from the domain of text classification. The empirical results illustrate the undesirable behavior of existing approaches and how the proposed methods overcome most of these methods across a range of cases.
description: Submitted to journal