cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Active power decoupling topology for AC-DC and DC-AC single-phase systems with decoupling capacitor minimization
Creators: name: Stawiarski, Łukasz
name: Piróg, Stanisław
Publisher: name: Polish Academy of Sciences
Year: 2018
Subjects: active power decoupling
double-line frequency ripple power
single-phase systems
power factor correction
capacitance reduction
microgrid converter

description: ARCHIVES OF ELECTRICAL ENGINEERING (AEE) (previously Archiwum Elektrotechniki), quarterly journal of the Polish Academy of Sciences is OpenAccess (PAN Electronic Library, publishing original scientific articles and short communiques from all branches of Electrical Power Engineering exclusively in English. The main fields of interest are related to the theory & engineering of the components of an electrical power system: switching devices, arresters, reactors, conductors, etc. together with basic questions of their insulation, ampacity, switching capability etc.; electrical machines and transformers; modelling & calculation of circuits; electrical & magnetic fields problems; electromagnetic compatibility; control problems; power electronics; electrical power engineering; nondestructive testing & nondestructive evaluation. Scoring assigned by the Polish Ministry of Science and Higher Education: 40 points  CiteScore metrics from Scopus, CiteScore 2019: 1.7 SCImago Journal Rank (SJR) 2019: 0.202 Source Normalized Impact per Paper (SNIP) 2019: 0.444 ICI Journal Master List 2018, Index Copernicus Value: 121.17
From Lully to Messiaen - Observations on French Art-Music
Creators: name: Davie, Scott
Publisher: name: Randwick Council
Year: 2019

description: This was a lecture and recital given by me on 27 April 2019 at La Perouse Museum, the site of the landing of Compte La Prouse and his French expedition in 1788. The place is sacred to the local indigenous people, who had peaceful interactions with the expedition. My lecture and recital drew elements of this history into a succinct event.
Halcyon - In Nature
Creators: name: Duck-Chong, Jenny
name: Sheldon, Jane
name: Walker, Sally
name: Gartner, Geoffrey
name: Gorbach, Vladimir
name: Brigden, Tim
name: Raval, Maharshi
Publisher: name: Halcyon
Year: 2019

description: In a concert of Contemporary Art Chamber Music, In Nature featured four world premieres by Larry Sitsky, Elena Kats Chernin, Melissa Hui and Madeleine Isaksson, the Australian premiere of Andrew Ford's new song cycle, "Nature" and Matthew Hindson's engaging "Insect Songs". The works, drawn from three continents and relationships old and new, featured texts and poetry from Australia, the UK, Finland, Sweden, France, Japan and China, performed by mezzo soprano Jenny Duck-Chong, soprano Jane Sheldon, flautist Sally Walker, cellist Geoffrey Gartner, guitarist Vladimir Gorbach, percussionist Tim Brigden and tabla player Maharshi Raval. Program: Andrew Ford "Nature", Elena Kats-Chernin's "Moondust" (Commissioned by flautist Sally Walker and dedicated to Dr Philip Spradbery, the renowned entomologist, CSIRO scientist and passionate environmental advocate) Madeleine Isaksson "Blad √∂ver blad", Larry Sitsky "The Bamboo Flute" Catherine Milliken "Kazuko", Nigel Butterley "Nature changes", Melissa Hui "Two songs on Poems from Longfellow".
Australian Chamber Orchestra: Beethoven 1, 2 & 3
Creators: name: Walker, Sally
Publisher: name: Australian Chamber Orchestra
Year: 2020

description: Australian Chamber Orchestra's Beethoven 1, 2 &3 was a national tour with 11 concerts and a CD production of Beethoven's first three Symphonies. Performed on historical instruments, Sally Walker - as Guest Principal Flautist - used a replica of a Grenser 8 keyed Grenadilla flute.
Rabi oscillations at three-photon laser excitation of a single rubidium Rydberg atom in an optical dipole trap
Creators: name: Beterov, I. I.
name: Yakshina, E. A.
name: Suliman, G.
name: Betleni, P. I.
name: Prilutskaya, A. A.
name: Skvortsova, D. A.
name: Zagirov, T. R.
name: Tretyakov, D. B.
name: Entin, V. M.
name: Bezuglov, N. N.
name: Ryabtsev, I. I.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In an experiment on three-photon laser excitation $5S_{1/2} \to 5P_{3/2} \to 6S_{1/2} \to 37P_{3/2}$ of a single $^{87}$Rb Rydberg atom in an optical dipole trap, we have observed for the first time three-photon Rabi oscillations between the ground and the Rydberg states. The single atom was detected optically by measuring the signal of resonant fluorescence with a low-noise sCMOS video camera. Relative probability of the atom to remain in the trap after the action of three synchronized laser excitation pulses was measured for their durations varied in the range from 100 ns to 2 $μ$s. A specific feature of the experiment was the usage of intense laser radiation at the wavelength of 1367 nm on the second excitation step, which provided the single-photon Rabi frequency up to 2 GHz to control the effective detunings of the intermediate levels of the three-photon transition due to ac Stark effect. We have detected Rabi oscillations with frequency from 1 to 5 MHz depending on the intensities of the laser pulses on the first and the second excitation steps with the coherence time of 0.7-0.8 $μ$s. The ways to increase the coherence time and contrast of the three-photon Rabi oscillations for applications in quantum information processing with Rydberg atoms are discussed.
description: 14 pages, 6 figures
The C21st Flautist, reimagined in light of being a Covid Concert Hall refugee
Creators: name: Walker, Sally
Publisher: name: The Australian National University
Year: 2020

description: How we need music has been made profoundly clear over these last months. Orchestras and opera companies, formally stable places of employment, are currently unable to perform, yet balcony concerts, online lessons and home recordings prove that what is essential adapts to survive. School leavers choosing their professional path are confronted with considerations that the previous generation didn't have; with adaptation, imagination and collaboration being perhaps more imperative than ever. Covid Concert Hall refugees, exiled from familiar large concert spaces due to social distancing policies, have been forced to find new performance spaces that defy the corona crisis. Consequently, the 1:1 CONCERTS have been created, inspired by the work of performance artist Marina Abramovićs 'Listening differently' (2019). One musician, one listener at a two-metre distance experiencing a ten-minute non-verbal one-to-one encounter, with the Australian bush, a goat's stable and an airport becoming 2020's alternate concert halls.
Supporting results and additional figures from Travelling-wave analysis of a model of tumour invasion with degenerate, cross-dependent diffusion
Creators: name: Colson, Chloé
name: Sánchez-Garduño, Faustino
name: Byrne, Helen M.
name: Maini, Philip K.
name: Lorenzi, Tommaso
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 10301 Numerical Analysis
subject: FOS: Mathematics
subject: 10299 Applied Mathematics not elsewhere classified
subject: 19999 Mathematical Sciences not elsewhere classified

description: This supplementary material contains the calculations that motivated Conjecture 1. It also includes a description of the numerical methods used to solve the different models and additional numerical results.
title: Comite permanent du droit des marques, des dessins et modeles industriels et des indications geographiques :
title: Rapport adopté par le Comité permanent.
titleType: Subtitle
Creators: name: (:Unas)
Publisher: name: Unknown
Year: 0

description: Le Comité permanent du droit des marques, des dessins et modèles industriels et des indications géographiques (ci-après dénommé “comité permanent” ou “SCT”) a tenu sa vingtième session à Genève du 1er au 5 décembre 2008.
TIC 290061484: A Triply Eclipsing Triple System with the Shortest Known Outer Period of 24.5 Days
Creators: name: Kostov, Veselin B.
name: Rappaport, Saul A.
name: Borkovits, Tamas
name: Powell, Brian P.
name: Gagliano, Robert
name: Omohundro, Mark
name: Biro, Imre B.
name: Moe, Max
name: Howell, Steve B.
name: Mitnyan, Tibor
name: Clark, Catherine A.
name: Kristiansen, Martti H.
name: Terentev, Ivan A.
name: Schwengeler, Hans M.
name: Pal, Andras
name: Vanderburg, Andrew
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have discovered a triply eclipsing triple-star system, TIC 290061484, with the shortest known outer period, Pout, of only 24.5 days. This "eclipses" the previous record set by lambda Tauri at 33.02 days, which held for 68 yr. The inner binary, with an orbital period of Pin = 1.8 days, produces primary and secondary eclipses and exhibits prominent eclipse timing variations with the same periodicity as the outer orbit. The tertiary star eclipses, and is eclipsed by, the inner binary with pronounced asymmetric profiles. The inclinations of both orbits evolve on observable timescales such that the third-body eclipses exhibit dramatic depth variations in TESS data. A photodynamical model provides a complete solution for all orbital and physical parameters of the triple system, showing that the three stars have masses of 6.85, 6.11, and 7.90 MSun, radii near those corresponding to the main sequence, and Teff in the range of 21,000-23,700 K. Remarkably, the model shows that the triple is in fact a subsystem of a hierarchical 2+1+1 quadruple with a distant fourth star. The outermost star has a period of ~3200 days and a mass comparable to the stars in the inner triple. In ~20 Myr, all three components of the triple subsystem will merge, undergo a Type II supernova explosion, and leave a single remnant neutron star. At the time of writing, TIC 290061484 is the most compact triple system and one of the tighter known compact triples (i.e., Pout/Pin = 13.7).
description: 27 pages, 13 figures, 6 tables
Screening effects on field emission from arrays of (5,5) carbon nanotubes: Quantum-mechanical simulation
Creators: name: Chen, Guihua
name: Wang, Weiliang
name: Peng, Jie
name: He, Chunshan
name: Deng, Shaozhi
name: Xu, Ningsheng
name: Li, Zhibing
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The simulation of field electron emission from arrays of micrometer-long open-ended (5, 5) carbon nanotubes is performed in the framework of quantum theory of many electrons. It is found that the applied external field is strongly screened when the spacing distance is shorter than the length of the carbon nanotubes. The optimal spacing distance is two to three times of the nanotube length, slightly depending on the applied external fields. The electric screening can be described by a factor that is a exponential function of the ratio of the spacing distance to the length of the carbon nanotubes. For a given length, the field enhancement factor decreases sharply as the screening factor larger than 0.05. The simulation implies that the thickness of the array should be larger than a value but it does not help the emission much by increasing the thickness a great deal.
GEMS: Galaxy fitting catalogues and testing parametric galaxy fitting codes
Creators: name: Häußler, Boris
name: McIntosh, Daniel H.
name: Barden, Marco
name: Bell, Eric F.
name: Rix, Hans-Walter
name: Borch, Andrea
name: Beckwith, Steven V. W.
name: Caldwell, John A. R.
name: Heymans, Catherine
name: Jahnke, Knud
name: Jogee, Shardha
name: Koposov, Sergey E.
name: Meisenheimer, Klaus
name: Sánchez, Sebastian F.
name: Somerville, Rachel S.
name: Wisotzki, Lutz
name: Wolf, Christian
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In the context of measuring structure and morphology of intermediate redshift galaxies with recent HST/ACS surveys, we tune, test, and compare two widely used fitting codes (GALFIT and GIM2D) for fitting single-component Sersic models to the light profiles of both simulated and real galaxy data. We find that fitting accuracy depends sensitively on galaxy profile shape. Exponential disks are well fit with Sersic models and have small measurement errors, whereas fits to de Vaucouleurs profiles show larger uncertainties owing to the large amount of light at large radii. We find that both codes provide reliable fits and little systematic error, when the effective surface brightness is above that of the sky. Moreover, both codes return errors that significantly underestimate the true fitting uncertainties, which are best estimated with simulations. We find that GIM2D suffers significant systematic errors for spheroids with close companions owing to the difficulty of effectively masking out neighboring galaxy light; there appears to be no work around to this important systematic in GIM2D's current implementation. While this crowding error affects only a small fraction of galaxies in GEMS, it must be accounted for in the analysis of deeper cosmological images or of more crowded fields with GIM2D. In contrast, GALFIT results are robust to the presence of neighbors because it can simultaneously fit the profiles of multiple companions thereby deblending their effect on the fit to the galaxy of interest. We find GALFIT's robustness to nearby companions and factor of >~20 faster runtime speed are important advantages over GIM2D for analyzing large HST/ACS datasets. Finally we include our final catalog of fit results for all 41,495 objects detected in GEMS.
description: Accepted for publication in ApJS October 2007, v172n2; 25 pages, 16 Figures, 9 Tables; for hi-resolution version, see http://www.mpia.de/homes/bhaeussl/galaxy_fitting.pdf. For results, catalogues and files for code-testing, see http://www.mpia.de/GEMS/fitting_paper.html
A Framework to Illustrate Kinematic Behavior of Mechanisms by Haptic Feedback
Creators: name: Zhang, Qinqin
name: Chablat, Damien
name: Bennis, Fouad
name: Zhang, Wei
Publisher: name: arXiv
Year: 2007
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The kinematic properties of mechanisms are well known by the researchers and teachers. The theory based on the study of Jacobian matrices allows us to explain, for example, the singular configuration. However, in many cases, the physical sense of such properties is difficult to explain to students. The aim of this article is to use haptic feedback to render to the user the signification of different kinematic indices. The framework uses a Phantom Omni and a serial and parallel mechanism with two degrees of freedom. The end-effector of both mechanisms can be moved either by classical mouse, or Phantom Omni with or without feedback.
Molecular line intensities as measures of cloud masses - II. Conversion factors for specific galaxy types
Creators: name: Bell, T. A.
name: Viti, S.
name: Williams, D. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present theoretically-established values of the CO-to-H2 and C-to-H2 conversion factors that may be used to estimate the gas masses of external galaxies. We consider four distinct galaxy types, represented by M51, NGC 6946, M82 and SMC N27. The physical parameters that best represent the conditions within the molecular clouds in each of the galaxy types are estimated using a chi^2 analysis of several observed atomic fine structure and CO rotational lines. This analysis is explored over a wide range of density, radiation field, extinction, and other relevant parameters. Using these estimated physical conditions in methods that we have previously established, CO-to-H2 conversion factors are then computed for CO transitions up to J=9-8. For the conventional CO(1-0) transition, the computed conversion factor varies significantly below and above the canonical value for the Milky Way in the four galaxy types considered. Since atomic carbon emission is now frequently used as a probe of external galaxies, we also present, for the first time, the C-to-H2 conversion factor for this emission in the four galaxy types considered.
description: 14 pages, 11 figures, accepted for publication in MNRAS
Initial high electric field -- vacuum arc breakdown test results for additively manufactured pure copper electrodes
Creators: name: Ratkus, A.
name: Torims, T.
name: Pikurs, G.
name: Bjelland, V.
name: Calatroni, S.
name: Peacock, R.
name: Serafim, C.
name: Vretenar, M.
name: Wuensch, W.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Additive Manufacturing (AM) is already well-established for various manufacturing applications, providing many benefits such as design freedom, novel and complex cooling designs for the parts and different performance improvements, as well as significantly reducing the production time. With the mentioned characteristics, AM is also being considered as a technology for manufacturing a Radio Frequency Quadrupole (RFQ) prototype. For this application, an important parameter is the voltage holding capability of the surfaces. Furthermore, the voltage holding capability of pure copper surfaces manufactured by AM is of interest for the accelerator community at large for prospective future developments. To characterize these properties, a series of high electric field tests were performed on pure copper electrodes produced by AM, using the CERN pulsed high-voltage DC system. The tests were carried out with AM produced electrodes with large surface roughness. During the testing process, a high vacuum was maintained. The electric breakdown rate was also monitored to ensure not to exceed the breakdown limit of 10 $^{-5}$ breakdowns per pulse. The achieved results provide the first, initial reference values for the performance of AM built pure copper electrodes for vacuum arc breakdown testing. Initial results prove the capability of AM electrodes to hold a high electric field, while having low breakdown rates. These are crucial results for further AM technology usage for different AM pure-copper accelerator components
description: Inproceedings IPAC2023, JACoW Publishing, ISBN: 978-3-95450-231-8
Robotic Waste Sorter with Agile Manipulation and Quickly Trainable Detector
Creators: name: Kiyokawa, Takuya
name: Katayama, Hiroki
name: Tatsuta, Yuya
name: Takamatsu, Jun
name: Ogasawara, Tsukasa
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Owing to human labor shortages, the automation of labor-intensive manual waste-sorting is needed. The goal of automating waste-sorting is to replace the human role of robust detection and agile manipulation of waste items with robots. To achieve this, we propose three methods. First, we provide a combined manipulation method using graspless push-and-drop and pick-and-release manipulation. Second, we provide a robotic system that can automatically collect object images to quickly train a deep neural-network model. Third, we provide a method to mitigate the differences in the appearance of target objects from two scenes: one for dataset collection and the other for waste sorting in a recycling factory. If differences exist, the performance of a trained waste detector may decrease. We address differences in illumination and background by applying object scaling, histogram matching with histogram equalization, and background synthesis to the source target-object images. Via experiments in an indoor experimental workplace for waste-sorting, we confirm that the proposed methods enable quick collection of the training image sets for three classes of waste items (i.e., aluminum can, glass bottle, and plastic bottle) and detection with higher performance than the methods that do not consider the differences. We also confirm that the proposed method enables the robot quickly manipulate the objects.
description: 15 pages, 18 figures
title: Modelling of influence of mechanical stresses arising in magnetic circuit on magnetizing characteristic
Creators: name: (:Unav)
Publisher: name: Polish Academy of Sciences
Year: 2019
Subjects: subject: modelling
subject: coupled phenomena
subject: magnetized characteristics
subject: mechanical stress (MS)

description: ARCHIVES OF ELECTRICAL ENGINEERING (AEE) (previously Archiwum Elektrotechniki), quarterly journal of the Polish Academy of Sciences is OpenAccess (PAN Electronic Library, publishing original scientific articles and short communiques from all branches of Electrical Power Engineering exclusively in English. The main fields of interest are related to the theory & engineering of the components of an electrical power system: switching devices, arresters, reactors, conductors, etc. together with basic questions of their insulation, ampacity, switching capability etc.; electrical machines and transformers; modelling & calculation of circuits; electrical & magnetic fields problems; electromagnetic compatibility; control problems; power electronics; electrical power engineering; nondestructive testing & nondestructive evaluation. Scoring assigned by the Polish Ministry of Science and Higher Education: 40 points  CiteScore metrics from Scopus, CiteScore 2018: 1.09 SCImago Journal Rank (SJR) 2018: 0.221 Source Normalized Impact per Paper (SNIP) 2018: 0.617 ICI Journal Master List 2018, Index Copernicus Value: 121.17
description: An algorithm of determination of mechanical stresses and deformations of the magnetic circuit shape, caused by forces of magnetic origin, is presented in this paper. The mechanical stresses cause changes of magnetizing characteristics of the magnetic circuit. The mutual coupling of magnetic and mechanical fields was taken into account in the algorithm worked out. A computational experiment showed that it was possible to include the interaction of both fields into one numerical model. The elaborated algorithm, taking into account the impact of mechanical stresses on magnetic parameters of construction materials, can be used in both the 2D and the 3D type field-model.
Mapping the Cosmological Confidence Ball Surface
Creators: name: Bryan, Brent
name: Schneider, Jeff
name: Miller, Christopher J.
name: Nichol, Robert C.
name: Genovese, Christopher
name: Wasserman, Larry
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a new technique to compute simultaneously valid confidence intervals for a set of model parameters. We apply our method to the Wilkinson Microwave Anisotropy Probe's (WMAP) Cosmic Microwave Background (CMB) data, exploring a seven dimensional space (tau, Omega_DE, Omega_M, omega_DM, omega_B, f_nu, n_s). We find two distinct regions-of-interest: the standard Concordance Model, and a region with large values of omega_DM, omega_B and H_0. This second peak in parameter space can be rejected by applying a constraint (or a prior) on the allowable values of the Hubble constant. Our new technique uses a non-parametric fit to the data, along with a frequentist approach and a smart search algorithm to map out a statistical confidence surface. The result is a confidence ``ball'': a set of parameter values that contains the true value with probability at least 1-alpha. Our algorithm performs a role similar to the often used Markov Chain Monte Carlo (MCMC), which samples from the posterior probability function in order to provide Bayesian credible intervals on the parameters. While the MCMC approach samples densely around a peak in the posterior, our new technique allows cosmologists to perform efficient analyses around any regions of interest: e.g., the peak itself, or, possibly more importantly, the 1-alpha confidence surface.
description: 41 pages, 12 figures. To appear in ApJ
Fluctuation Relations for Diffusion Processes
Creators: name: Chetrite, Raphael
name: Gawedzki, Krzysztof
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences
subject: 46N55

description: The paper presents a unified approach to different fluctuation relations for classical nonequilibrium dynamics described by diffusion processes. Such relations compare the statistics of fluctuations of the entropy production or work in the original process to the similar statistics in the time-reversed process. The origin of a variety of fluctuation relations is traced to the use of different time reversals. It is also shown how the application of the presented approach to the tangent process describing the joint evolution of infinitesimally close trajectories of the original process leads to a multiplicative extension of the fluctuation relations.
description: 38 pages
Cosmological constraints combining H(z), CMB shift and SNIa observational data
Creators: name: Lazkoz, Ruth
name: Majerotto, Elisabetta
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recently H(z) data obtained from differential ages of galaxies have been proposed as a new geometrical probe of dark energy. In this paper we use those data, combined with other background tests (CMB shift and SNIa data), to constrain a set of general relativistic dark energy models together with some other models motivated by extra dimensions. Our analysis rests mostly on Bayesian statistics, and we conclude that LCDM is at least substantially favoured, and that braneworld models are less favoured than general relativistic ones.
description: 17 pages, 11 figures; improved discussion, new figures, updated to match published version
Quantum Dynamics of the Taub Universe in a Generalized Uncertainty Principle framework
Creators: name: Battisti, Marco Valerio
name: Montani, Giovanni
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The implications of a Generalized Uncertainty Principle on the Taub cosmological model are investigated. The model is studied in the ADM reduction of the dynamics and therefore a time variable is ruled out. Such a variable is quantized in a canonical way and the only physical degree of freedom of the system (related to the Universe anisotropy) is quantized by means of a modified Heisenberg algebra. The analysis is performed at both classical and quantum level. In particular, at quantum level, the motion of wave packets is investigated. The two main results obtained are as follows. i) The classical singularity is probabilistically suppressed. The Universe exhibits a stationary behavior and the probability amplitude is peaked in a determinate region. ii) The GUP wave packets provide the right behavior in the establishment of a quasi-isotropic configuration for the Universe.
description: 10 pages, 4 figures; v2: section added, to appear on PRD
The Santa Fe Light Cone Simulation Project: I. Confusion and the WHIM in Upcoming Sunyaev-Zel'dovich Effect Surveys
Creators: name: Hallman, Eric J.
name: O'Shea, Brian W.
name: Burns, Jack O.
name: Norman, Michael L.
name: Harkness, Robert
name: Wagner, Rick
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first results from a new generation of simulated large sky coverage (~100 square degrees) Sunyaev-Zeldovich effect (SZE) cluster surveys using the cosmological adaptive mesh refinement N-body/hydro code Enzo. We have simulated a very large (512^3h^{-3}Mpc^3) volume with unprecedented dynamic range. We have generated simulated light cones to match the resolution and sensitivity of current and future SZE instruments. Unlike many previous studies of this type, our simulation includes unbound gas, where an appreciable fraction of the baryons in the universe reside. We have found that cluster line-of-sight overlap may be a significant issue in upcoming single-dish SZE surveys. Smaller beam surveys (~1 arcmin) have more than one massive cluster within a beam diameter 5-10% of the time, and a larger beam experiment like Planck has multiple clusters per beam 60% of the time. We explore the contribution of unresolved halos and unbound gas to the SZE signature at the maximum decrement. We find that there is a contribution from gas outside clusters of ~16% per object on average for upcoming surveys. This adds both bias and scatter to the deduced value of the integrated SZE, adding difficulty in accurately calibrating a cluster Y-M relationship. Finally, we find that in images where objects with M > 5x10^{13} M_{\odot} have had their SZE signatures removed, roughly a third of the total SZE flux still remains. This gas exists at least partially in the Warm Hot Intergalactic Medium (WHIM), and will possibly be detectable with the upcoming generation of SZE surveys.
description: 14 pages, 13 figures, version accepted to ApJ. Major revisions made
Linear effects of perturbed recombination
Creators: name: Lewis, Antony
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Perturbations in the ionization fraction after recombination affect the Compton cooling of density perturbations. Once the gas temperature starts to decouple from the CMB temperature, ionization fraction perturbations can have a significant influence on the subsequent gas temperature perturbation evolution. This directly affects the 21cm spin temperature of the gas, and also modifies the small-scale baryon perturbation evolution via the difference in baryon pressure. The effect on the gas temperature perturbations can be significant on all scales, and galactic-scale baryon perturbations are modified at the percent level at redshifts z >~ 100 where numerical simulations are typically started.
description: 5 pages; for more details of effect on 21cm see astro-ph/0702600; code available at http://camb.info/sources/
Deriving the PEE proposal from the Locking bit thread configuration
Creators: name: Lin, Yi-Yu
name: Sun, Jia-Rui
name: Zhang, Jun
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the holographic framework, we argue that the partial entanglement entropy (PEE) can be explicitly interpreted as the component flow flux in a locking bit thread configuration. By applying the locking theorem of bit threads, and constructing a concrete locking scheme, we obtain a set of uniquely determined component flow fluxes from this viewpoint, and successfully derive the PEE proposal and its generalized version in the multipartite cases. Moreover, from this perspective of bit threads, we also present a coherent explanation for the coincidence between the BPE (balanced partial entanglement)/EWCS (entanglement wedge cross section) duality proposed recently and the EoP (entanglement of purification)/EWCS duality. We also discuss the issues implied by this coincident between the idea of the PEE and the picture of locking thread configuration.
description: 35 pages, 7 figures, accepted by jhep
title: Scaling laws for the FE solutions of induction machines
Creators: name: (:Unav)
Publisher: name: Polish Academy of Sciences
Year: 2019
Subjects: subject: evolutionary strategy
subject: finite element method analysis
subject: induction machine
subject: induction motor
subject: loss calculation
subject: multi-objective optimization
subject: scaling laws

description: ARCHIVES OF ELECTRICAL ENGINEERING (AEE) (previously Archiwum Elektrotechniki), quarterly journal of the Polish Academy of Sciences is OpenAccess (PAN Electronic Library, publishing original scientific articles and short communiques from all branches of Electrical Power Engineering exclusively in English. The main fields of interest are related to the theory & engineering of the components of an electrical power system: switching devices, arresters, reactors, conductors, etc. together with basic questions of their insulation, ampacity, switching capability etc.; electrical machines and transformers; modelling & calculation of circuits; electrical & magnetic fields problems; electromagnetic compatibility; control problems; power electronics; electrical power engineering; nondestructive testing & nondestructive evaluation. Scoring assigned by the Polish Ministry of Science and Higher Education: 40 points  CiteScore metrics from Scopus, CiteScore 2018: 1.09 SCImago Journal Rank (SJR) 2018: 0.221 Source Normalized Impact per Paper (SNIP) 2018: 0.617 ICI Journal Master List 2018, Index Copernicus Value: 121.17
description: In this paper a scaling approach for the solution of 2D FE models of electric machines is proposed. This allows a geometrical and stator and rotor resistance scaling as well as a rewinding of a squirrel cage induction machine enabling an efficient numerical optimization. The 2D FEM solutions of a reference machine are calculated by a model based hybrid numeric induction machine simulation approach. In contrast to already known scaling procedures for synchronous machines the FEM solutions of the induction machine are scaled in the stator-current-rotor-frequency-plane and then transformed to the torque- speed-map. This gives the possibility to use a new time scaling factor that is necessary to keep a constant field distribution. The scaling procedure is validated by the finite element method and used in a numerical optimization process for the sizing of an electric vehicle traction drive considering the gear ratio. The results show that the scaling procedure is very accurate, computational very efficient and suitable for the use in machine design optimization.
(:unav)
Creators: name: (:Unav)
Publisher: name: Komitet Słowianoznawstwa PAN
Year: 2019

description: Rocznik Slawistyczny – ukazuje się od 1908 roku, początkowo w Krakowie, a od 1994 we Wrocławiu. Publikacje dotyczą szeroko pojętej slawistyki. Oprócz języka polskiego publikuje też artykuły w językach obcych.
Meissner Effect: History of Development and Novel Aspects
Creators: name: Kozhevnikov, Vladimir
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The discovery of the Meissner effect was a turning point in the history of superconductivity. It demonstrated that superconductivity is an equilibrium state of matter, thus allowing to use thermodynamics for its study. This provided a justification for the two-fluid model of Gorter and Casimir, a seminal thermodynamic theory founded on a postulate of zero entropy of the superconducting (S) component of conduction electrons. It also demonstrated that, apart from zero resistivity, the S phase is also characterized by zero magnetic induction, used as a basic postulate in the theory of Londons underlying the understanding of electromagnetic properties of superconductors. Here the experimental and theoretical aspects of the Meissner effect are reviewed. The reader will see that, in spite of almost nine decades age, the London theory still contains questions, the answers to which can lead to a revision of the standard picture of the Meissner state (MS) and other superconducting states. An attempt is made to take a fresh look at electrodynamics of the MS and try resolve the issues associated with this most important state of all superconductors. It is shown that the concept of Cooper pairing along with the Bohr-Sommerfeld quantization condition allows one to construct a semi-classical theoretical model consistently addressing properties of the MS and beyond, including non-equilibrium properties of superconductors caused by the total current. As follows from the model, the three "big zeros" of superconductivity (zero resistance, induction and entropy) have equal weight and grow from a single root: quantization of the angular momentum of paired electrons. The model predicts some yet unknown effects. If confirmed, they can help in studies of microscopic properties of all superconductors. Preliminary experimental results suggesting the need to revise the standard picture of the MS are presented.
description: 30 pages, 15 figures
In vitro Glykolysehemmung durch Citrat/Natriumfluorid
Creators: name: Sharma, Saskia
Publisher: name: Universität Rostock
Year: 2020
Subjects: subject: 610 Medical sciences Medicine

description: Für die korrekte Messung der Nüchternglukose ist die In-vitro-Glykolysehemmung erforderlich. Seit Jahren wurde dies durch die Verwendung von Natriumfluorid erzielt. Zwischen den Jahren 2014 und 2015 hat das MVZ der MDI in Berlin neue Blutzuckerentnahmeröhrchen eingeführt, welche neben Natriumfluorid auch Citratpuffer enthalten. Der Citrateffekt hemmt die Glykolyse innerhalb weniger Minuten. Die vorliegende retrospektive Studie zeigt, dass durch die Stabilisierung der Blutglukose in citrathaltigen Probengefäßen höhere Glukosekonzentrationen gemessen werden und die Diabetesprävalenz steigt.
A weak dichotomy below E_1 \times E_3
Creators: name: Kanovei, Vladimir
Publisher: name: arXiv
Year: 2007
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03E15

description: If E is an equivalence relation Borel reducible to E_1 \times E_3 then either E is Borel reducible to the equality of countable sets of reals or E_1 is Borel reducible to E. The "either" case admits further strengthening.
Effects of dark matter on the in-spiral properties of the binary neutron stars
Creators: name: Das, H. C.
name: Kumar, Ankit
name: Patra, S. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using the relativistic mean-field model, we calculate the properties of binary neutron star (BNS) in the in-spiral phase. Assuming the dark matter (DM) particles are accreted inside the neutron star (NS) due to its enormous gravitational field, the mass $M$, radius $R$, tidal deformability $λ$ and dimensionless tidal deformability $Λ$ are calculated at different DM fractions. The value of $M$, $R$, $λ$ and $Λ$ decreases with the increase of DM percentage inside the NS. The in-spiral phase properties of the BNS are explored within the post-Newtonian (PN) formalism, as it is suitable up to the last orbits in the in-spiral phase. We calculate the strain amplitude of the polarization waveform $h_+$ and $h_\times$, (2,2) mode waveform $h_{22}$, orbital phase $Φ$, frequency of the gravitational wave $f$ and PN parameter $x$ with DM as an extra candidate inside the NS. The magnitude of $f$, $Φ$ and $x$ are almost the same for all assumed forces; however, the in-spiral time duration in the last orbit is different. We find that the BNS with soft equation of state and a high fraction of DM sustains more time in their in-spiral phase. We suggest that one should take DM inside the NS when they modelling the in-spiral waveforms for the BNS systems.
description: 9 pages, 7 figures, 2 tables, accepted for publication in MNRAS
Modified atmosphere packaging of sweet cherries
Creators: name: Thomson, Carrie Ann
Publisher: name: University of British Columbia
Year: 2010

description: Modified atmosphere packaging (MAP) involves the storage of perishable commodities in atmospheres containing higher carbon dioxide and lower oxygen levels than in air. When combined with refrigeration temperatures, MAP techniques result in an appreciable extension of the post-harvest life of fruits and vegetables. Modified atmosphere packaging storage trials performed in this study involved packaging sweet cherries in four plastic films, covering a range of gas permeabilities, coupled with storage at 1 °C. Cherries packaged in plastic produce bags obtained from a local supermarket served as the control treatment for the experiment. A variety of chemical and physical characteristics of the stored fruit was analyzed and values were compared to those obtained for unstored fresh fruit. Deviation of values from those obtained for zero storage fruit was taken as a measure of cherry deterioration. Sensory analysis was performed for assessing cherry quality. Storage of cherries in films ranging from medium-high to high gas permeabilities resulted in internal aerobic atmospheres with elevated carbon dioxide levels. Cherries in these packages displayed superior quality retention over the storage period as compared to other treatments, and could be stored successfully for up to six weeks. While the control cherries retained their acceptable quality for about five weeks, mold growth was apparent after this storage time. Storage of cherries in medium-low permeability films resulted in the accumulation of very high levels of carbon dioxide within the packages. Cherries in these packages deteriorated more quickly than cherries stored in the higher permeability films, but remained marginally acceptable at the end of eight weeks of storage. Carbon dioxide levels rose and oxygen levels fell quickly in the low permeability film packages. The quality of the cherries in these packages diminished very rapidly, and fruit was unacceptable after four weeks of storage. It is proposed from these findings that the low oxygen and high carbon dioxide levels within the high and medium-high permeability packages slowed product respiration, thereby extending the effective storage period of the fruit. The inhibition of spoilage organisms under these atmospheres likely also played a role in mitigating quality changes.
Spurious heating of stellar motions in simulated galactic disks by dark matter halo particles
Creators: name: Ludlow, Aaron D.
name: Fall, S. Michael
name: Schaye, Joop
name: Obreschkow, Danail
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use idealized N-body simulations of equilibrium stellar disks embedded within course-grained dark matter haloes to study the effects of spurious collisional heating on disk structure and kinematics. Collisional heating artificially increases the vertical and radial velocity dispersions of disk stars, as well as the thickness and size of disks; the effects are felt at all galacto-centric radii. The integrated effects of collisional heating are determined by the mass of dark matter halo particles (or equivalently, by the number of particles at fixed halo mass), their local density and characteristic velocity dispersion, but are largely insensitive to the stellar particle mass. The effects can therefore be reduced by increasing the mass resolution of dark matter in cosmological simulations, with limited benefits from increasing the baryonic (or stellar) mass resolution. We provide a simple empirical model that accurately captures the effects of spurious collisional heating on the structure and kinematics of simulated disks, and use it to assess the importance of disk heating for simulations of galaxy formation. We find that the majority of state-of-the-art zoom simulations, and a few of the highest-resolution, smallest-volume cosmological runs, are in principle able to resolve thin stellar disks in Milky Way-mass haloes, but most large-volume cosmological simulations cannot. For example, dark matter haloes resolved with fewer than $\approx 10^6$ particles will collisionally heat stars near the stellar half-mass radius such that their vertical velocity dispersion increases by $\gtrsim 10$ per cent of the halo's virial velocity in approximately one Hubble time.
description: Minor changes to match MNRAS accepted version. Main text: 19 pages, 10 Figure (Appendix: 5 pages, 6 figures)
The use of cohesive devices by school-age language impaired children
Creators: name: Ruthven, Lucille Katherine
Publisher: name: University of British Columbia
Year: 2010

description: Frequency and distribution of cohesive devices used in the narrative discourse of six language impaired and six normal language children aged 9;1 to 11;8 were investigated in order to gain a greater understanding of the discourse difficulties experienced by language impaired children. Reference, substitution/ellipsis, conjunction, and lexical cohesion were analyzed using an adaptation of Halliday & Hasan's (1976) description of cohesion in English. Discourse reference was further investigated using 1) retrieval analysis (Martin 1977, 1983), 2) form/function analysis (Bamberg 1987) and 3) sentence position analysis. The data analyzed for the present report consisted of three stories told by each child (a total of thirty-six stories), which were obtained on the following tasks: 1) picture book narration, 2) retell of the same story without pictures, and 3) video recall. Language impaired children used significantly fewer cohesive devices per utterance than normal language children, a finding that appeared to be related to shorter utterance length on the part of language impaired children, fewer attempts on their part to provide cohesive links (particularly lexical ones), and a greater number of failed cohesion attempts. Retrieval analysis revealed a greater use of anaphoric and esphoric reference (forward reference within the nominal group) by normal language children than by language impaired children. Results of the form/function analysis indicated that the language impaired children used more definite (versus indefinite) forms to introduce participants, more pronominals to switch reference, and more nominals to maintain reference than the normal language children. The referential devices of both groups of children varied as a function of the protagonist; both groups showed evidence of a thematic subject strategy. Task differences tended to hold for one group or the other, suggesting that the two groups were responding differently to changes in contextual configuration. The findings suggest that the difficulty faced by language impaired children in the realm of discourse may not only be the general one of discovering a systematic relationship between discourse-sensitive forms and their functions, but also that of discovering appropriate form-function pairings specific to a given context. The results underline the importance of discourse analysis to clinical assessment and intervention.
WHAM: A WENO-based general relativistic numerical scheme I: Hydrodynamics
Creators: name: Tchekhovskoy, Alexander
name: McKinney, Jonathan C.
name: Narayan, Ramesh
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Active galactic nuclei, x-ray binaries, pulsars, and gamma-ray bursts are all believed to be powered by compact objects surrounded by relativistic plasma flows driving phenomena such as accretion, winds, and jets. These flows are often accurately modelled by the relativistic magnetohydrodynamics (MHD) approximation. Time-dependent numerical MHD simulations have proven to be especially insightful, but one regime that remains difficult to simulate is when the energy scales (kinetic, thermal, magnetic) within the plasma become disparate. We develop a numerical scheme that significantly improves the accuracy and robustness of the solution in this regime. We use a modified form of the WENO method to construct a finite-volume general relativistic hydrodynamics code called WHAM that converges at fifth order. We avoid (1) field-by-field decomposition by adaptively reducing down to 2-point stencils near discontinuities for a more accurate treatment of shocks, and (2) excessive reduction to low order stencils, as in the standard WENO formalism, by maintaining high order accuracy in smooth monotonic flows. Our scheme performs the proper surface integral of the fluxes, converts cell averaged conserved quantities to point conserved quantities before performing the reconstruction step, and correctly averages all source terms. We demonstrate that the scheme is robust in strong shocks, very accurate in smooth flows, and maintains accuracy even when the energy scales in the flow are highly disparate.
description: 33 pages, 22 figures, accepted to MNRAS, for a version with high quality figures see http://www.cfa.harvard.edu/~atchekho/research/wham1hires.pdf