cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Accelerating parameter inference with graphics processing units
Creators: name: Wysocki, D.
name: O'Shaughnessy, R.
name: Fang, Y-L. L.
name: Lange, Jacob
Publisher: name: arXiv
Year: 2019
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Gravitational wave Bayesian parameter inference involves repeated comparisons of GW data to generic candidate predictions. Even with algorithmically efficient methods like RIFT or reduced-order quadrature, the time needed to perform these calculations and overall computational cost can be significant compared to the minutes to hours needed to achieve the goals of low-latency multimessenger astronomy. By translating some elements of the RIFT algorithm to operate on graphics processing units (GPU), we demonstrate substantial performance improvements, enabling dramatically reduced overall cost and latency.
description: v2: version accepted in PRD
Unitarity bounds on charged/neutral state mass ratio
Creators: name: Chen, Wei-Ming
name: Huang, Yu-tin
name: Noumi, Toshifumi
name: Wen, Congkao
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this letter, we study the implications of unitary completion of quantum gravity on the low energy spectrums, through an infinite set of unitarity bounds on the forward-limit scattering amplitudes. In three dimensions, we find that light states with charge-to-mass ratio $z$ greater than $1$ can only be consistent if there exists other light states, preferably neutral. Applied to the compactification of the Standard Model, where the low energy couplings are dominated by the electron with $|z|\sim 10^{22}$, this provides a novel understanding of the need for light neutrinos.
description: 5+2 pages, 2+2 figures
Distance learning during the pandemic-converted (1).pdf
Creators: name: EL KISSIA, Reda
Publisher: name: figshare
Year: 2021
Subjects: subject: 200303 English as a Second Language
subject: FOS: Languages and literature
subject: 200101 Communication Studies
subject: FOS: Media and communications
subject: 200102 Communication Technology and Digital Media Studies

description: This study examines Ibn Tofail University's experience with e learning for the first time in its history, because of the Covid-19 pandemic, which drove many Moroccan institutions to suspend traditional educational systems and began online education in the early spring of 2020.
Phytomyza tetrasticha Hendel 1927
Creators: name: Bächli, Gerhard
name: Merz, Bernhard
name: Haenni, Jean-Paul
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy

description: Phytomyza tetrasticha Hendel, 1927. (Cerny & Merz 2007).
description: Published as part of Bächli, Gerhard, Merz, Bernhard & Haenni, Jean-Paul, 2014, Dritter Nachtrag zur Checkliste der Diptera der Schweiz, pp. 119-140 in Entomo Helvetica 7 on page 128, DOI: 10.5169/seals-985967, http://zenodo.org/record/8096745
Absence of lattice strain anomalies at the electronic topological transition in zinc at high pressure
Creators: name: Steinle-Neumann, Gerd
name: Stixrude, Lars
name: Cohen, Ronald E.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: High pressure structural distortions of the hexagonal close packed (hcp) element zinc have been a subject of controversy. Earlier experimental results and theory showed a large anomaly in lattice strain with compression in zinc at about 10 GPa which was explained theoretically by a change in Fermi surface topology. Later hydrostatic experiments showed no such anomaly, resulting in a discrepancy between theory and experiment. We have computed the compression and lattice strain of hcp zinc over a wide range of compressions using the linearized augmented plane wave (LAPW) method paying special attention to k-point convergence. We find that the behavior of the lattice strain is strongly dependent on k-point sampling, and with large k-point sets the previously computed anomaly in lattice parameters under compression disappears, in agreement with recent experiments.
description: 9 pages, 6 figures, Phys. Rev. B (in press)
Additional file 1: of An insight into the sialotranscriptome and virome of Amazonian anophelines
Creators: name: Scarpassa, Vera
name: Humbeto Debat
name: Ronildo Alencar
name: Saraiva, José
name: Calvo, Eric
name: Arcà, Bruno
name: Ribeiro, José
Publisher: name: figshare
Year: 2019
Subjects: subject: Space Science
subject: Medicine
subject: Molecular Biology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Developmental Biology
subject: Marine Biology
subject: Computational Biology

description: Tables S1–S7. in a single file. (DOCX 35 kb)
Tailorable Elasticity of Cantilever Using Spatio-Angular Functionally Graded Biomimetic Scales
Creators: name: Ali, Hessein
name: Ebrahimi, Hossein
name: Ghosh, Ranajay
Publisher: name: arXiv
Year: 2018
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Cantilevered beams are of immense importance as structural and sensorial members for a number of applications. Endowing tailorable elasticity can have wide ranging engineering ramification. Such tailorability could be possible using some type of spatial gradation in the beam's material or cross section. However, these often require extensive additive and subtractive material processing or specialized casts. In this letter, we demonstrate an alternative bio inspired mechanical pathway, which is based on exploiting the nonlinearity that would arise from a functionally graded distribution of biomimetic scales on the surface using an analytical approach. This functional gradation is geometrically sourced and could arise from either spatial or angular gradation of scales. We analyze such a functionally graded cantilever beam under uniform loading. In comparison with uniformly distributed scales, we find significant differences in bending stiffness for both spatial and angular gradations. Spatial and angular functional gradation share some universality but also sharp contrasts in their effect on the underlying beam. A combination of both types of gradation in the structure can be used to alternatively increase or decrease stiffness and therefore a pathway to tailor the elasticity of a cantilever beam relatively easily. These results give rise to an architected framework for designing and optimizing the topography of leveraged solids.
description: 17 pages, 5 figures
Monte Carlo Quasi-Heatbath by approximate inversion
Creators: name: de Forcrand, Ph.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Condensed Matter (cond-mat)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: When sampling the distribution P(phi) ~ exp(-|A phi|^2), a global heatbath normally proceeds by solving the linear system A phi = eta, where eta is a normal Gaussian vector, exactly. This paper shows how to preserve the distribution P(phi) while solving the linear system with arbitrarily low accuracy. Generalizations are presented.
description: 10 pages, 1 figure; typos corrected, reference added; version to appear in Phys. Rev. E
STIS Echelle Observations of the Seyfert Galaxy NGC 4151: Physical Conditions in the Ultraviolet Absorbers
Creators: name: Kraemer, S. B.
name: Crenshaw, D. M.
name: Hutchings, J. B.
name: George, I. M.
name: Danks, A. C.
name: Gull, T. R.
name: Kaiser, M. E.
name: Nelson, C. H.
name: Weistrop, D.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have examined the physical conditions in intrinsic UV-absorbing gas in the Seyfert galaxy NGC 4151, using echelle spectra obtained with the Space Telescope Imaging Spectrograph (STIS). We confirm the presence of the kinematic components detected in earlier GHRS observations as well as a new broad absorption feature at a radial velocity of -1680 km/s. The UV continuum of NGC 4151 decreased by a factor of 4 over the previous two years, and we argue the changes in the column density of the low ionization absorption lines associated with the broad component at -490 km/s reflect the decrease in the ionizing flux. Most of the strong absorption lines (e.g., N V, C IV, Si IV) from this component are saturated, but show substantial residual flux in their cores, indicating that the absorber does not fully cover the source of emission. Our interpretation is that the unocculted light is due to scattering by free electrons from an extended region, which reflects continuum, emission lines, and absorption lines. We have been able to constrain the densities for the kinematic components based on absorption lines from metastable states of C III and Fe II, and/or the ratios of ground and fine structure lines of O I,C II, and Si II. We have generated a set of photoionization models which match the ionic column densities for each component during the present low flux state and those seen in previous high flux states with the GHRS and STIS, confirming that the absorbers are photoionized and respond to the changes in the continuum flux. We have been able to map the relative radial positions of the absorbers, and find that the gas decreases in density with distance. None of the UV absorbers is of sufficiently large column density or high enough ionization state to account for the X-ray absorption.
description: 46 pages (Latex), 14 figures (postscript), plus a landscape table (Latex), to appear in the Astrophysical Journal
Phase shift in atom interferometers: corrections for non-quadratic potentials and finite-duration laser pulses
Creators: name: Bertoldi, A.
name: Minardi, F.
name: Prevedelli, M.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We derive an expression for the phase shift of an atom interferometer in a gravitational field taking into account both the finite duration of the light pulses and the effect of a small perturbing potential added to a stronger uniform gravitational field, extending the well-known results for rectangular pulses and at most quadratic potentials. These refinements are necessary for a correct analysis of present day high resolution interferometers.
description: 12 pages, 3 figures
Phytomyza zarzyckii Nowakowski 1975
Creators: name: Bächli, Gerhard
name: Merz, Bernhard
name: Haenni, Jean-Paul
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy

description: Phytomyza zarzyckii Nowakowski, 1975. (Cerny 2009).
description: Published as part of Bächli, Gerhard, Merz, Bernhard & Haenni, Jean-Paul, 2014, Dritter Nachtrag zur Checkliste der Diptera der Schweiz, pp. 119-140 in Entomo Helvetica 7 on page 128, DOI: 10.5169/seals-985967, http://zenodo.org/record/8096745
Cuando la atención deja de ser sostenida: Ritmos circadianos y vigilancia
Creators: name: Ángel Correa, Tania Lara
Publisher: name: Zenodo
Year: 2019
Subjects: vigilancia
atencion
psicologia
psicología
ergonomía
ergonomia
luz
conducción
temperatura

description: Materiales (diapositivas, texto y audio) de una conferencia presentada en la XII Reunión Científica sobre Atención (RECA 12), durante los días 3-5 octubre 2019, en Almería, España
description: Financiado por el Ministerio de Ciencia e Innovación y por el Ministerio de Economía y Competitividad (PLAN NACIONAL de I+D+i, referencia: PSI2014-58041-P y PSI2010-15399).
Energy levels and far-infrared spectroscopy for two electrons in a semiconductor nanoring
Creators: name: Hu, Hui
name: Zhu, Jia-Lin
name: Xiong, Jia-Jiong
Publisher: name: arXiv
Year: 2000
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The effects of electron-electron interaction of a two-electron nanoring on the energy levels and far-infrared (FIR) spectroscopy have been investigated based on a model calculation which is performed within the exactly numerical diagonalization. It is found that the interaction changes the energy spectra dramatically, and also shows significant influence on the FIR spectroscopy. The crossings between the lowest spin-singlet and triplet states induced by the coulomb interaction are clearly revealed. Our results are related to the experiment recently carried out by A. Lorke et al. [Phys. Rev. Lett. 84, 2223 (2000)].
description: 17 pages, 6 figures, revised and accepted by Phys. Rev. B (Dec. 15)
Nonlinear instability of inhomogeneous steady states solutions to the HMF Model
Creators: name: Lemou, Mohammed
name: Luz, Ana Maria
name: Méhats, Florian
Publisher: name: arXiv
Year: 2019
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this work we prove the nonlinear instability of inhomogeneous steady states solutions to the Hamiltonian Mean Field (HMF) model. We first study the linear instability of this model under a simple criterion by adapting the techniques developed in [19]. In a second part, we extend to the inhomogeneous case some techniques developed in [14, 17, 18] and prove a nonlinear instability result under the same criterion.
Josephson current carried by Andreev levels in superconducting quantum point contacts
Creators: name: Furusaki, A.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The dc Josephson effect in a superconducting quantum point contact, where supercurrent flows through a small number of channels, is reviewd. The central role of Andreev levels is emphasized which carry the whole supercurrent in short symmetric Josephson junctions including tunnel junctions. A simple intuitive view of the dc Josephson effect in a quantum point contact is given in terms of multiple Andreev reflections. The quantization of the critical current in superconducting quantum point contacts is briefly discussed.
description: 8 pages, 4 figures, submitted to Superlattices and Microstructures
Heleomyza (Heleomyza) borealis
Creators: name: Bächli, Gerhard
name: Merz, Bernhard
name: Haenni, Jean-Paul
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Heleomyzidae
Heleomyza
Heleomyza borealis

description: Heleomyza (Heleomyza) borealis (Boheman, 1865).
 1 ♂, Vallorbe (VD), Grotte des Fées, 20.03.1979, leg. Strinati & Aellen (MHNG). Neufund.
description: Published as part of Bächli, Gerhard, Merz, Bernhard & Haenni, Jean-Paul, 2014, Dritter Nachtrag zur Checkliste der Diptera der Schweiz, pp. 119-140 in Entomo Helvetica 7 on page 128, DOI: 10.5169/seals-985967, http://zenodo.org/record/8096745
Turbulence-driven ion beams in the magnetospheric Kelvin-Helmholtz instability
Creators: name: Sorriso-Valvo, Luca
name: Catapano, Filomena
name: Retinò, Alessandro
name: Contel, Olivier Le
name: Perrone, Denise
name: Roberts, Owen W.
name: Coburn, Jesse T.
name: Panebianco, Vincenzo
name: Valentini, Francesco
name: Perri, Silvia
name: Greco, Antonella
name: Malara, Francesco
name: Carbone, Vincenzo
name: Veltri, Pierluigi
name: Pezzi, Oreste
name: Fraternale, Federico
name: Di Mare, Francesca
name: Marino, Raffaele
name: Giles, Barbara
name: Moore, Thomas E.
name: Russell, Christopher T.
name: Torbert, Roy B.
name: Burch, Jim L.
name: Khotyaintsev, Yuri V.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Space Physics (physics.space-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The description of the local turbulent energy transfer, and the high-resolution ion distributions measured by the Magnetospheric Multiscale mission, together provide a formidable tool to explore the cross-scale connection between the fluid-scale energy cascade and plasma processes at sub-ion scales. When the small-scale energy transfer is dominated by Alfvénic, correlated velocity and magnetic field fluctuations, beams of accelerated particles are more likely observed. Here, for the first time we report observations suggesting the nonlinear wave-particle interaction as one possible mechanism for the energy dissipation in space plasmas.
description: Includes Supplemental material
Mid-infrared observations of NGC 1068 with ISOCAM
Creators: name: Floc'h, E. Le
name: Mirabel, I. F.
name: Laurent, O.
name: Charmandaris, V.
name: Gallais, P.
name: Sauvage, M.
name: Vigroux, L.
name: Cesarsky, C.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on Mid-Infrared (MIR) observations of the Seyfert 2 galaxy NGC 1068, obtained with ISOCAM in low-resolution spectro-imaging mode. The spatial resolution (around 5 arcsec) allows us to disentangle the circumnuclear starburst regions from the emission of the active galactic nucleus (AGN). The global spatial distribution of the Unidentified Infrared Bands (UIBs) is similar to the cold dust component, traced by the 450 microns emission and the gaseous component obtained from the CO(1-0) map. However, a shift between the maximum of the UIB and 450 microns emission is clearly seen in our maps. The UIBs in the MIR (5-16 microns) originate almost exclusively from the starburst regions in the galactic disk with an emission peaking at the extremity of the stellar/ gaseous bar at a distance of 1 kpc from the AGN. The spectrum of the nucleus is characterized over the whole 5-16 microns range by a strong continuum which can be fitted with a power law of index -1.7. Moreover, the high [NeIII]/[NeII] ratio (>2.5) in the nuclear region argues for a hard radiation field from the AGN. Observations indicate that the AGN in NGC 1068 contributes less than 5% to the total integrated UIB emission even though its hot dust continuum contributes as much as 75% to the total MIR flux. On the contrary, the nuclear contribution to the cold dust emission decreases considerably at submillimeter wavelengths and does not represent more than 25% of the total integrated emission at 450 microns.
description: 11 pages, 4 figures, accepted for publication in A&A
Additional file 1 of Alpha, Beta, gamma human PapillomaViruses (HPV) detection with a different sets of primers in oropharyngeal swabs, anal and cervical samples
Creators: name: Sias, Catia
name: Salichos, Leonidas
name: Lapa, Daniele
name: Nonno, Franca
name: Baiocchini, Andrea
name: Capobianchi, Maria
name: Garbuglia, Anna
Publisher: name: figshare
Year: 2019
Subjects: subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: 60506 Virology
subject: Computational Biology

description: Table S1 Study population characteristics of HIV infected patients. (DOCX 14â kb)
Hot Spots on the Fermi Surface of Bi2212: Stripes versus Superstructure
Creators: name: Mesot, J.
name: Norman, M. R.
name: Ding, H.
name: Campuzano, J. C.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In a recent paper Saini et al. have reported evidence for a pseudogap around (pi,0) at room temperature in the optimally doped superconductor Bi2212. This result is in contradiction with previous ARPES measurements. Furthermore they observed at certain points on the Fermi surface hot spots of high spectral intensity which they relate to the existence of stripes in the CuO planes. They also claim to have identified a new electronic band along Gamma-M1 whose one dimensional character provides further evidence for stripes. We demonstrate in this Comment that all the measured features can be simply understood by correctly considering the superstructure (umklapp) and shadow bands which occur in Bi2212.
description: 1 page, revtex, 1 encapsulated postscript figure (color)
An Efficient and Robust Technique for Achieving Self Consistency in Electronic Structure Calculations
Creators: name: Bowler, D. R.
name: Gillan, M. J.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: Pulay's Residual Metric Minimization (RMM) method is one of the standard techniques for achieving self consistency in ab initio electronic structure calculations. We describe a reformulation of Pulay's RMM which guarantees reduction of the residual at each step. The new version avoids the use of empirical mixing parameters, and is expected to be more robust than the original version. We present practical tests of the new method implemented in a standard code based on density-functional theory (DFT), pseudopotentials, and plane-wave basis sets. The tests show improved speed in achieving self consistency for a variety of condensed-matter systems.
description: Six pages, one table, no figures. Accepted by Chem. Phys. Lett
Additional file 3: of Effect of enhancing audit and feedback on uptake of childhood pneumonia treatment policy in hospitals that are part of a clinical network: a cluster randomized trial
Creators: name: Ayieko, Philip
name: Irimu, Grace
name: Ogero, Morris
name: Mwaniki, Paul
name: Malla, Lucas
name: Julius, Thomas
name: Mercy Chepkirui
name: Mbevi, George
name: Oliwa, Jacquie
name: Agweyu, Ambrose
name: Akech, Samuel
name: Were, Fred
name: English, Mike
Publisher: name: figshare
Year: 2019
Subjects: subject: Medicine
subject: Neuroscience
subject: Pharmacology
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Developmental Biology
subject: Cancer
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Example of hospital-specific pneumonia feedback sheet provided to the enhanced feedback arm. (DOCX 87 kb)
Gamma Ray Pulsars: Observations
Creators: name: Thompson, David J.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: High-energy gamma rays are a valuable tool for studying particle acceleration and radiation in the magnetospheres of energetic pulsars. The six or more pulsars seen by CGRO/EGRET show that: the light curves usually have double-peak structures (suggesting a broad cone of emission); gamma rays are frequently the dominant component of the radiated power; and all the spectra show evidence of a high-energy turnover. Unless a new pulsed component appears at higher energies, progress in gamma-ray pulsar studies will be greatest in the 1-20 GeV range. Ground-based telescopes whose energy ranges extend downward toward 10 GeV should make important measurements of the spectral cutoffs. The Gamma-ray Large Area Space Telescope (GLAST), now in planning for a launch in 2005, will provide a major advance in sensitivity, energy range, and sky coverage.
description: To appear in International Symposium on High-Energy Gamma-Ray Astronomy, Heidelberg, Germany. 12 pages, 8 figures
Heleomyza (Anapotacta) setulosa Czerny 1924
Creators: name: Bächli, Gerhard
name: Merz, Bernhard
name: Haenni, Jean-Paul
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Heleomyzidae
Heleomyza
Heleomyza setulosa

description: Heleomyza (Anapotacta) setulosa Czerny, 1924).
 1 ♀, Saint-Cergue (VD), Grotte du Bois du Corps de Garde, 22.02.1962, leg. Strinati & Aellen (MHNG). Neufund.
description: Published as part of Bächli, Gerhard, Merz, Bernhard & Haenni, Jean-Paul, 2014, Dritter Nachtrag zur Checkliste der Diptera der Schweiz, pp. 119-140 in Entomo Helvetica 7 on page 129, DOI: 10.5169/seals-985967, http://zenodo.org/record/8096745
Comment on "Spin relaxation in quantum Hall systems"
Creators: name: Khaetskii, Alexander V.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: W. Apel and Yu.A. Bychkov have recently considered the spin relaxation in a 2D quantum Hall system for the filling factor close to unity [PRL v.82, 3324 (1999)]. The authors considered only one spin flip mechanism (direct spin-phonon coupling) among several possible spin-orbit related ones and came to the conclusion that the spin relaxation time due to this mechanism is quite short: around $10^{-10}$ s at B=10 T (for GaAs). This time is much shorter than the typical time ($10^{-5}$ s) obtained earlier by D. Frenkel while considering the spin relaxation of 2D electrons in a quantizing magnetic field without the Coulomb interaction and for the same spin-phonon coupling. I show that the authors' conclusion about the value of the spin-flip time is wrong and have deduced the correct time which is by several orders of magnitude longer. I also discuss the admixture mechanism of the spin-orbit interaction.
description: 1 page
Dynamical Transition from Triplets to Spinon Excitations: A Series Expansion Study of the $J_1-J_2-δ$ spin-half chain
Creators: name: Singh, Rajiv R. P
name: Weihong, Zheng
Publisher: name: arXiv
Year: 1998
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the spin-half Heisenberg chain with alternating nearest neighbor interactions $J_1(1+δ)$ and $J_1(1-δ)$ and a uniform second neighbor interaction $J_2=y (1-δ)$ by series expansions around the limit of decoupled dimers ($δ=1$). By extrapolating to $δ=0$ and tuning $y$, we study the critical point separating the power-law and spontaneously dimerized phases of the spin-half antiferromagnet. We then focus on the disorder line $y=0.5$, $0\le δ\le 1$, where the ground states are known exactly. We calculate the triplet excitation spectrum, their spectral weights and wavevector dependent static susceptibility along this line. It is well known that as $δ\to 0$, the spin-gap is still non-zero but the triplets are replaced by spinons as the elementary excitations. We study this dynamical transition by analyzing the series for the spectral weight and the static susceptibility. In particular, we show that the spectral weight for the triplets vanishes and the static spin-susceptibility changes from a simple pole at imaginary wavevectors to a branch cut at the transition.
description: RevTeX, 3 figures, updated references and figure captions
Facebook vs Instagram Questionnaire: Problematic use, self-esteem, loneliness and depression sysmptoms
Creators: name: Limniou, Maria
Publisher: name: Zenodo
Year: 2021
Subjects: social media
problematic use
well-being

description: This questionnaire could be used to explore the difference beteen Facebook and Instagram users in problematic use and well-being. Questions about the number of received “likes” and Facebook friends/Instagram followers as well as the importance of “likes” and Facebook friends/Instagram followers allow researchers to further compare the two social media platforms.
autoAx: An Automatic Design Space Exploration and Circuit Building Methodology utilizing Libraries of Approximate Components
Creators: name: Mrazek, Vojtech
name: Hanif, Muhammad Abdullah
name: Vasicek, Zdenek
name: Sekanina, Lukas
name: Shafique, Muhammad
Publisher: name: arXiv
Year: 2019
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Approximate computing is an emerging paradigm for developing highly energy-efficient computing systems such as various accelerators. In the literature, many libraries of elementary approximate circuits have already been proposed to simplify the design process of approximate accelerators. Because these libraries contain from tens to thousands of approximate implementations for a single arithmetic operation it is intractable to find an optimal combination of approximate circuits in the library even for an application consisting of a few operations. An open problem is "how to effectively combine circuits from these libraries to construct complex approximate accelerators". This paper proposes a novel methodology for searching, selecting and combining the most suitable approximate circuits from a set of available libraries to generate an approximate accelerator for a given application. To enable fast design space generation and exploration, the methodology utilizes machine learning techniques to create computational models estimating the overall quality of processing and hardware cost without performing full synthesis at the accelerator level. Using the methodology, we construct hundreds of approximate accelerators (for a Sobel edge detector) showing different but relevant tradeoffs between the quality of processing and hardware cost and identify a corresponding Pareto-frontier. Furthermore, when searching for approximate implementations of a generic Gaussian filter consisting of 17 arithmetic operations, the proposed approach allows us to identify approximately $10^3$ highly important implementations from $10^{23}$ possible solutions in a few hours, while the exhaustive search would take four months on a high-end processor.
description: Accepted for publication at the Design Automation Conference 2019 (DAC'19), Las Vegas, Nevada, USA
Contact resistance between carbon nanotubes
Creators: name: Buldum, Alper
name: Lu, Jian Ping
Publisher: name: arXiv
Year: 2000
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quantum transport properties of intermolecular nanotube contacts are investigated. We find that atomic structure in the contact region plays important roles and resistance of contacts varies strongly with geometry and nanotube chirality. Nanotube end-end contacts have low resistance and show negative differential resistance (NDR) behavior. Contact resistance can be dramatically decreased by exerting small pressure/force between the tubes if the contact is commensurate. Significant variation and nonlinearity of contact resistance may lead to new device applications.
description: 4 pages, 4 figures
Josephson-Junction Qubits and the Readout Process by Single-Electron Transistors
Creators: name: Makhlin, Yuriy
name: Schoen, Gerd
name: Shnirman, Alexander
Publisher: name: arXiv
Year: 1998
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Several physical realizations of quantum bits have been proposed. Of those, nano-electronic devices appear most suitable for large-scale integration and potential applications. We suggest to use low-capacitance Josephson junctions, exploiting the coherence of tunneling in the superconducting state combined with the possibility to control individual charges by Coulomb blockade effects (cond-mat/9706016,cond-mat/9808067). These systems constitute quantum bits, with logical states differing by one Cooper-pair charge. Single- and two-bit operations can be performed by applying a sequence of gate voltages. The phase coherence time is sufficiently long to allow a series of these steps. In addition to the manipulation of qubits the resulting quantum state has to be read out. This can be accomplished by coupling a single-electron transistor capacitively to the qubit (cond-mat/9801125). To describe this quantum measurement process we study the time evolution of the density matrix of the coupled system. Only when a transport voltage is turned on, the transistor destroys the phase coherence of the qubit; in this case within a short time. The measurement is accomplished after a longer time scale, when the signal resolves the different quantum states. At still longer times the measurement process itself destroys the information about the initial state. We present a suitable set of system parameters, which can be realized by present-day technology.
description: RevTex, 19 pages, 9 figures; contribution to "Exploring the Quantum-Classical Frontier: Recent Advances in Macroscopic and Mesoscopic Quantum Phenomena." Eds. J.R.Friedman and S.Han Presentation improved
Resolved Kinematics of Runaway and Field OB Stars in the Small Magellanic Cloud
Creators: name: Oey, M. S.
name: Jones, J. Dorigo
name: Castro, N.
name: Zivick, P.
name: Besla, G.
name: Januszewski, H. C.
name: Moe, M.
name: Kallivayalil, N.
name: Lennon, D. J.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use GAIA DR2 proper motions of the RIOTS4 field OB stars in the Small Magellanic Cloud (SMC) to study the kinematics of runaway stars. The data reveal that the SMC Wing has a systemic peculiar motion relative to the SMC Bar of (v_RA, v_Dec) = (62 +/-7, -18+/-5) km/s and relative radial velocity +4.5 +/- 5.0 km/s. This unambiguously demonstrates that these two regions are kinematically distinct: the Wing is moving away from the Bar, and towards the Large Magellanic Cloud with a 3-D velocity of 64 +/- 10 km/s. This is consistent with models for a recent, direct collision between the Clouds. We present transverse velocity distributions for our field OB stars, confirming that unbound runaways comprise on the order of half our sample, possibly more. Using eclipsing binaries and double-lined spectroscopic binaries as tracers of dynamically ejected runaways, and high-mass X-ray binaries (HMXBs) as tracers of runaways accelerated by supernova kicks, we find significant contributions from both populations. The data suggest that HMXBs have lower velocity dispersion relative to dynamically ejected binaries, consistent with the former corresponding to less energetic supernova kicks that failed to unbind the components. Evidence suggests that our fast runaways are dominated by dynamical, rather than supernova, ejections.
description: Accepted to ApJ Letters. 10 pages, 4 figures
Neoleria flavicornis
Creators: name: Bächli, Gerhard
name: Merz, Bernhard
name: Haenni, Jean-Paul
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Heleomyzidae
Neoleria
Neoleria flavicornis

description: Neoleria flavicornis (Loew, 1862).
 2 ♀♀, Leuk-Platten (VS), 630 m, 22.04.1998, leg. Merz & Botta (MHNG). Neufund.
description: Published as part of Bächli, Gerhard, Merz, Bernhard & Haenni, Jean-Paul, 2014, Dritter Nachtrag zur Checkliste der Diptera der Schweiz, pp. 119-140 in Entomo Helvetica 7 on page 129, DOI: 10.5169/seals-985967, http://zenodo.org/record/8096745
Additional file 1: of Effect of enhancing audit and feedback on uptake of childhood pneumonia treatment policy in hospitals that are part of a clinical network: a cluster randomized trial
Creators: name: Ayieko, Philip
name: Irimu, Grace
name: Ogero, Morris
name: Mwaniki, Paul
name: Malla, Lucas
name: Julius, Thomas
name: Mercy Chepkirui
name: Mbevi, George
name: Oliwa, Jacquie
name: Agweyu, Ambrose
name: Akech, Samuel
name: Were, Fred
name: English, Mike
Publisher: name: figshare
Year: 2019
Subjects: subject: Medicine
subject: Pharmacology
subject: Sociology
subject: FOS: Sociology
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Developmental Biology
subject: Cancer
subject: Computational Biology

description: CONSORT checklist for reporting of cluster randomised trial. (DOCX 29 kb)
Secular Bar-Mode Evolution and Gravitational Waves From Neutron Stars
Creators: name: Lai, Dong
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The secular instability and nonlinear evolution of the m=2 f-mode (bar-mode) driven by gravitational radiation reaction in a rapidly rotating, newly formed neutron star are reviewed. There are two types of rotating bars which generate quite different gravitational waveforms: those with large internal rotation relative to the bar figure (Dedekind-like bars) have GW frequency sweeping downward during the evolution, and those with small internal rotation (Jacobi-like) have GW frequency sweeping upward. Various sources of viscosity (which affects the instability) in hot nuclear matter are reexamined, and the possible effect of star-disk coupling on the bar-mode instability is also discussed.
description: 12 pages. To be published in "Astrophysical Sources of Gravitational Radiation for Ground-Based Detectors", ed. J. Centrella (AIP Press)
Scoliocentra amplicornis
Creators: name: Bächli, Gerhard
name: Merz, Bernhard
name: Haenni, Jean-Paul
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Heleomyzidae
Scoliocentra
Scoliocentra amplicornis

description: Scoliocentra amplicornis (Cerny, 1924). (Merz & Gatt 2012).
description: Published as part of Bächli, Gerhard, Merz, Bernhard & Haenni, Jean-Paul, 2014, Dritter Nachtrag zur Checkliste der Diptera der Schweiz, pp. 119-140 in Entomo Helvetica 7 on page 129, DOI: 10.5169/seals-985967, http://zenodo.org/record/8096745
Various series expansions for a Heisenberg antiferromagnet model for SrCu$_2$(BO$_3$)$_2$
Creators: name: Weihong, Zheng
name: Hamer, C. J.
name: Oitmaa, J.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use a variety of series expansion methods at both zero and finite temperature to study an antiferromagnetic Heisenberg spin model proposed recently by Miyahara and Ueda for the quasi two-dimensional material SrCu$_2$(BO$_3$)$_2$. We confirm that this model exhibits a first-order quantum phase transition at T=0 between a gapped dimer phase and a gapless Néel phase when the ratio $x=J'/J$ of nearest and next-nearest neighbour interactions is varied, and locate the transition at $x_c=0.691(6)$. Using longer series we are able to give more accurate estimates of the model parameters by fitting to the high temperature susceptibility data.
description: RevTeX, 13 figures
Case study: Use of surface electromyography in masseter to investigate the muscular effort and movement features during the naturally chewing and swallowing
Creators: name: Lima, Marcela Rodrigues
name: Campos, Daniel Prado
name: Pontim, Carlos Eduardo
name: Wosch, Marisa Caetano Januário
name: Setti, João Antônio Palma
name: Bertotti, Fábio Luiz
Publisher: name: Zenodo
Year: 2019
Subjects: masticatory; masseter - muscle; movements

description: Chewing and swallowing patterns was large
 described as a risk factor for degenerative diseases diagnosis. In
 this paper, the electromyography technique was used to collect
 the electrical potential from masseter muscle. Aiming to extract
 the movement features and muscular effort during chewing
 activity of a solid aliment - gummy. Was used an accelerometer -
 detecting the hand movement - to facilitate the visual
 segmentation of each mastigation and swallow signal. The
 maximum voluntary contraction was obtained by the forced
 chew in an Parafilm positioned between the molar teeths. The
 signal characteristics was obtained through those data analysis
 methods: Root Mean Square (RMS), Teager–Kaiser energy
 operator (TKEO) and double threshold. The protocol proceed
 was made with one health subject, adult, male, instructed to
 naturally chew the aliment. The results shows significant
 differences on the RMS value (p <0.01) between the first
 chewing stages and the final one (25, 50 and 75%). In
 conclusion, as shown in results, the electromyography can be
 used to detect the chewing pattern and stages - initial (bite) and
 final (swallow).
Young Supernova Remnants: Issues and Prospects
Creators: name: McKee, Christopher F.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: After reviewing recent work on the dynamics of young supernova remnants (YSNRs) and discussing how YSNRs can be used as physics laboratories, I discuss several challenges: Where are the very young SNRs in the Galaxy? Can very young SNRs produce gamma ray bursts? The Connections Challenge: Can one infer the nature of the supernova and its progenitor star from observations of the YSNR?
description: Proceedings of the 11th Annual Astrophysics Conference in Maryland "Young Supernova Remnants"
Optically-Induced Highly-Efficient Detection and Separation of Chiral Molecules through Shortcuts to Adiabaticity
Creators: name: Vitanov, Nikolay V.
name: Drewsen, Michael
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A highly-efficient method for optical detection and separation of left- and right-handed chiral molecules is presented. The method utilizes a closed-loop three-state system in which the population dynamics depends on the phases of the three couplings. Due to the different signs of the coupling between two of the states for the opposite chiralities and the phase sensitivity of the scheme, the population dynamics is chirality-dependent. By using concepts from the `shortcuts to adiabaticity' approach, one can achieve 100\% contrast in state population transfer between the two enantiomers, which can be probed by light-induced fluorescence in the case of large ensembles or through resonantly-enhanced multiphoton ionization at the single molecular level.
description: 7 pages, 6 figures
Theory for the reduction of products of spin operators
Creators: name: Jensen, P. J.
name: Aguilera-Granja, F.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this study we show that the sum of the powers of arbitrary products of quantum spin operators such as $(S^+)^l(S^-)^m(S^z)^n$ can be reduced by one unit, if this sum is equal to 2S+1, S being the spin quantum number. We emphasize that by a repeated application of this procedure \em all \em arbitrary spin operator products with a sum of powers larger than 2S can be replaced by a combination of spin operators with a maximum sum of powers not larger than 2S. This transformation is exact. All spin operators must belong to the same lattice site. By use of this procedure the consideration of single-ion anisotropies and the investigation of the magnetic reorientation within a Green's function theory are facilitated. Furthermore, it may be useful for the study of time dependent magnetic properties within the ultrashort (fsec) time domain.
description: 11 pages, 1 table, uses rotating
Properties of low-lying states in a diffusive quantum dot and Fock-space localization
Creators: name: Mejia-Monasterio, Carlos
name: Richert, Jean
name: Rupp, Thomas
name: Weidenmueller, Hans A.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Motivated by an experiment by Sivan et al. (Europhys. Lett. 25, 605 (1994)) and by subsequent theoretical work on localization in Fock space, we study numerically a hierarchical model for a finite many-body system of Fermions moving in a disordered potential and coupled by a two-body interaction. We focus attention on the low-lying states close to the Fermi energy. Both the spreading width and the participation number depend smoothly on excitation energy. This behavior is in keeping with naive expectations and does not display Anderson localization. We show that the model reproduces essential features of the experiment by Sivan et al.
description: 4 pages, 3 figures, accepted for publication in Phys. Rev. Lett
Suillia cepelaki Martinek 1985
Creators: name: Bächli, Gerhard
name: Merz, Bernhard
name: Haenni, Jean-Paul
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy

description: Suillia cepelaki Martinek, 1985. (Merz & Gatt 2012).
description: Published as part of Bächli, Gerhard, Merz, Bernhard & Haenni, Jean-Paul, 2014, Dritter Nachtrag zur Checkliste der Diptera der Schweiz, pp. 119-140 in Entomo Helvetica 7 on page 129, DOI: 10.5169/seals-985967, http://zenodo.org/record/8096745
Anthomyza clara Rohacek 2006
Creators: name: Bächli, Gerhard
name: Merz, Bernhard
name: Haenni, Jean-Paul
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy

description: Anthomyza clara Rohaček, 2006. (Rohaček 2006).
description: Published as part of Bächli, Gerhard, Merz, Bernhard & Haenni, Jean-Paul, 2014, Dritter Nachtrag zur Checkliste der Diptera der Schweiz, pp. 119-140 in Entomo Helvetica 7 on page 129, DOI: 10.5169/seals-985967, http://zenodo.org/record/8096745
Persistent current in metals with a large dephasing rate
Creators: name: Schwab, P.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In a weakly disordered metal electron interactions are responsible for both decoherence of the quasi-particles as well as for quantum corrections to thermodynamic properties. We consider electrons which are interacting with two-level-systems. We show that the two-level-systems enhance the average equilibrium (``persistent'') current in an ensemble of mesoscopic rings. The result supports the recent suggestion that two puzzles in mesoscopic physics may be related: The low temperature saturation of the dephasing time and the high persistent current in rings.
description: 4pages, no figures
Typhamyza bifasciata
Creators: name: Bächli, Gerhard
name: Merz, Bernhard
name: Haenni, Jean-Paul
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Anthomyzidae
Typhamyza
Typhamyza bifasciata

description: Typhamyza bifasciata (Wood, 1911).
Merz (2012d) erwähnt diese Art für den Kanton Genf, allerdings ohne Angabe, dass sie neu für die Schweiz ist. Der Eintrag beruht auf dem folgenden Fund: 5 ♂♂, 5 ♀♀, Confignon (GE), bord de l’Aire, 400 m, 12.06.2011, leg. B. Merz (MHNG).
description: Published as part of Bächli, Gerhard, Merz, Bernhard & Haenni, Jean-Paul, 2014, Dritter Nachtrag zur Checkliste der Diptera der Schweiz, pp. 119-140 in Entomo Helvetica 7 on page 129, DOI: 10.5169/seals-985967, http://zenodo.org/record/8096745
Evidence for a Sudden Magnetic Field Reconfiguration in SGR 1900+14
Creators: name: Woods, Peter M.
name: Kouveliotou, Chryssa
name: Gogus, Ersin
name: Finger, Mark H.
name: Swank, Jean
name: Smith, Don A.
name: Hurley, Kevin
name: Thompson, Christopher
Publisher: name: arXiv
Year: 2001
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the detection of large flux changes in the persistent X-ray flux of SGR 1900+14 during its burst active episode in 1998. Most notably, we find a factor ~700 increase in the non-burst X-ray flux following the August 27th flare, which decayed in time as a power-law. Our measurements indicate that the pulse fraction remains constant throughout this decay. This suggests a global flux enhancement as a consequence of the August 27th flare rather than localized heating. While the persistent flux has since recovered to the pre-outburst level, the pulse profile has not. The pulse shape changed to a near sinusoidal profile within the tail of the August 27th flare (in gamma-rays) and this effect has persisted for more than 1.5 years (in X-rays). The results presented here suggest the magnetic field of the neutron star in SGR 1900+14 was significantly altered (perhaps globally) during the giant flare of August 27.
description: 17 pages, accepted for publication in ApJ