cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
LES-deduced acoustic modelling for jet noise
Creators: name: Howlett, Alex
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 99999 Engineering not elsewhere classified
subject: FOS: Other engineering and technologies

description: The ability to predict jet noise is crucial for the aviation industry, particularly in order to meet its commitments to reduce aviation noise by 65% according to ACARE 2050 targets. Therefore, in order to proceed with this objective, a comprehensive methodology for the prediction of noise and, most importantly, jet noise is required. As part of this need to predict jet noise is the ability to predict jet noise at high frequency, for example with the target of a Strouhal number (St) of 10. Aeroacoustic methods reliant on the coupling of an eddy-resolving method with an acoustic extrapolation, such as the Ffowcs Williams-Hawkings (FW-H) method, need extensive mesh resolution to resolve high-frequency acoustic pressure fluctuations in the near field. An alternative to the eddy-resolving method is the turbulent statistic acoustic modelling approach that is typically coupled with a solution from a Reynolds Averaged Navier-Stokes (RANS) simulation. Investigations, however, have found that RANS alone is unable to provide suitable turbulent statistics for more complex jets such as serrated jets. As jet nozzle design continues to increase in complexity it is important to be able to have a design methodology to robustly predict turbulent statistics for a variety of jets. Further to the limitation of turbulence modelling, RANS is unable to provide unsteady data necessary to correctly determine the coefficients required for acoustic modelling. Therefore a method of using statistics from LES is pursued to inform the acoustic model. Whilst it is simple to obtain most statistics from LES, the calculation of dissipation rate (ε) from LES is not straightforward. A potentially promising method whereby the ε turbulent transport equation using mean flow field data from an LES solution.This thesis therefore pursues the use of the ε informed by an LES solution in order to correctly calculate the corresponding ε in order to use turbulent statistics from LES to inform acoustic modelling. Further to this, two methods of acoustic coefficients determination shall be pursued in order to create a self-contained methodology for acoustic modelling informed by LES.Between experimental and LES turbulent statistics there has been good agreement which is demonstrated. Further to this, the ability of the ε turbulent transport equation is demonstrated for jets with profiles using the transport equation matching directly calculated profiles. The use of two- point velocity statistics has been successfully used to determine acoustic coefficients for noise modelling. Finally, modelling results have compared favourable to experimental far-field noise data for both round and serrated jets showing superior high-frequency noise predictive capabilities to FW-H thereby demonstrating the advantages of the acoustic modelling approach.
Structural peculiarities of plastically-deformed cementite and their influence on magnetic characteristics and Mossbauer parameters
Creators: name: Arzhnikov, A. K.
name: Dobysheva, L. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Cementite Fe3C is studied with first-principles calculations. Two possible positions of carbon atoms in the iron sublattice are considered: with prismatic or octahedral environment. Mossbauer spectra (MS) with parameters calculated for both modifications are simulated above and below the Curie temperature. A possibility to detect the change in carbon position upon annealing from MS is discussed. It is shown that this is hardly possible using a standard approach to treatment of MS, but it can be seen in more subtle details of the MS below the Curie temperature, such as widths and positions of separate lines.
description: 4 pages, 3 figures (presented in Third Seeheim Conference on Magnetism, 26-30 Aug. 2007, Frankfurt, Germany)
Vortex Lattice Structures of a Bose-Einstein Condensate in a Rotating Triangular Lattice Potential
Creators: name: Sato, T.
name: Ishiyama, T.
name: Nikuni, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the vortex pinning effect in a Bose-Einstein Condensate in the presence of a rotating lattice potential by numerically solving the time-dependent Gross-Pitaevskii equation. We consider a triangular lattice potential created by blue-detuned laser beams. By rotating the lattice potential, we observe a transition from the Abrikosov vortex lattice to the pinned vortex lattice. We investigate the transition of the vortex lattice structure by changing conditions such as angular velocity, strength, and lattice constant of a rotating lattice potential. Our simulation results clearly show that the lattice potential has a strong vortex pinning effect when the vortex density coincides with the density of the pinning points.
description: 5 pages, 5 figures
Presence and Diversity of Different Enteric Viruses in Wild Norway Rats (Rattus norvegicus)
Creators: name: Niendorf, Sandra
name: Harms, Dominik
name: F. Hellendahl, Katja
name: Heuser, Elisa
name: Böttcher, Sindy
name: Jacobsen, Sonja
name: Bock, Claus-Thomas
name: Ulrich, Rainer G.
Publisher: name: Robert Koch-Institut
Year: 2021
Subjects: subject: astrovirus
subject: enterovirus
subject: hepatitis E virus
subject: norovirus
subject: Norway rat
subject: rodent
subject: rotavirus
subject: zoonosis
subject: 610 Medizin und Gesundheit

description: Abstract: Rodents are common reservoirs for numerous zoonotic pathogens, but knowledge about diversity of pathogens in rodents is still limited. Here, we investigated the occurrence and genetic diversity of enteric viruses in 51 Norway rats collected in three different countries in Europe. RNA of at least one virus was detected in the intestine of 49 of 51 animals. Astrovirus RNA was detected in 46 animals, mostly of rat astroviruses. Human astrovirus (HAstV-8) RNA was detected in one, rotavirus group A (RVA) RNA was identified in eleven animals. One RVA RNA could be typed as rat G3 type. Rat hepatitis E virus (HEV) RNA was detected in five animals. Two entire genome sequences of ratHEV were determined. Human norovirus RNA was detected in four animals with the genotypes GI.P4-GI.4, GII.P33-GII.1, and GII.P21. In one animal, a replication competent coxsackievirus A20 strain was detected. Additionally, RNA of an enterovirus species A strain was detected in the same animal, albeit in a different tissue. The results show a high detection rate and diversity of enteric viruses in Norway rats in Europe and indicate their significance as vectors for zoonotic transmission of enteric viruses. The detailed role of Norway rats and transmission pathways of enteric viruses needs to be investigated in further studies.
Urban transport in developing countries : the peseros of Mexico City
Creators: name: Roschlau, Michael Walter
Publisher: name: University of British Columbia
Year: 2010

description: The most serious problems of urban transport in developing countries involve traffic congestion, insufficient space for pedestrians and other non-motorised modes, poor public transit service, the increasing attractiveness of the automobile due to rising incomes, and the chronic lack of financial resources required to make a concerted problem-solving effort. Many of the solutions suggested by planners and consultants from developed countries are both expensive and require a substantial time investment before the benefits can be realised. Others are politically unfeasible or not well-suited to the needs of the city in less developed countries. An indigenous response to the inadequate provision of urban transport in developing countries is the establishment of intermediate forms of public transport, such as jitneys or fixed-route shared taxis. These are able to provide levels of speed, comfort and convenience comparable to those of travel by private car, at considerably lower cost. Jitneys are relatively energy-efficient and consume much less road space per passenger than do private automobiles. The jitney originally developed in North America during the First World War, largely as a response to inadequate public transit service, but virtually disappeared again within a few years since the street railway operators were able to have legislation passed that made jitney operation uneconomic. In Third World cities, jitneys developed independently, and have enjoyed great success, in part due to a much greater demand for public transport and to fewer restrictive regulations. Mexico City is one of the largest urban areas in the developing countries and has a public transport system that includes a very extensive network of jitney services, several different classes of motor buses, trolley coaches, trams, four separate types of taxi services as well as a fast and efficient Metro system. These various elements of public transport are very interdependent and complementary, making remarkably good use of the available road space. A detailed examination of the jitney system in Mexico City, its regulation, organisation and economics was undertaken through personal observation and discussions as well as using an intensive survey of both jitney drivers and passengers. This has revealed that the jitneys are of great value, providing fast, frequent, comfortable and convenient public transportation which serves as a genuine alternative to private cars. The flexible nature of the jitneys makes them very demand-responsive and thereby efficient providers of urban transport. The jitneys employ a large number of people and are a profitable enterprise, contributing positively to the urban economy of Mexico City.
Pulsed extraction of ionization from helium buffer gas
Creators: name: Morrissey, D. J.
name: Bollen, G.
name: Facina, M.
name: Schwarz, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The migration of intense ionization created in helium buffer gas under the influence of applied electric fields is considered. First the chemical evolution of the ionization created by fast heavy-ion beams is described. Straight forward estimates of the lifetimes for charge exchange indicate a clear suppression of charge exchange during ion migration in low pressure helium. Then self-consistent calculations of the migration of the ions in the electric field of a gas-filled cell at the National Superconducting Cyclotron Laboratory (NSCL) using a Particle-In-Cell computer code are presented. The results of the calculations are compared to measurements of the extracted ion current caused by beam pulses injected into the NSCL gas cell.
description: Accepted for pubilication in Nucl. Instrum. Meth. B, 14 pages, 8 figures
Problems with kinematic mean field electrodynamics at high magnetic Reynolds numbers
Creators: name: Cattaneo, F.
name: Hughes, D. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss the applicability of the kinematic $α$-effect formalism at high magnetic Reynolds numbers. In this regime the underlying flow is likely to be a small-scale dynamo, leading to the exponential growth of fluctuations. Difficulties arise with both the actual calculation of the $α$ coefficients and with its interpretation. We argue that although the former may be circumvented -- and we outline several procedures by which the the $α$ coefficients can be computed in principle -- the interpretation of these quantities in terms of the evolution of the large-scale field may be fundamentally flawed.
description: 5 pages, LaTeX, no figures
MarlinTPC: A Marlin based common TPC software framework for the LC-TPC collaboration
Creators: name: Abernathy, Jason
name: Dehmelt, Klaus
name: Diener, Ralf
name: Hunt, Jim
name: Janssen, Matthias Enno
name: Killenberg, Martin
name: Krautscheid, Thorsten
name: Muennich, Astrid
name: Ummenhofer, Martin
name: Vogel, Adrian
name: Wienemann, Peter
Publisher: name: arXiv
Year: 2007
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We describe the goals and present functionality of MarlinTPC, a common software framework for the LC-TPC collaboration based on LCIO, Marlin and other ilcsoft tools.
description: Submitted to the proceedings of the International Linear Collider Workshop 2007 (LCWS07), 5 pages
An Improvement on Olson's Constant for Z_p+Z_p
Creators: name: Bhowmik, Gautami
name: Schlage-Puchta, Jan-Christoph
Publisher: name: arXiv
Year: 2008
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: For a prime number p greater than 6000, the Olson's constant for the group Z_p+Z_p is given by Ol(Z_p+Z_p)=p-1+Ol(Z_p).
description: Soumis pour publication
Myriad phases of the Checkerboard Hubbard Model
Creators: name: Yao, Hong
name: Tsai, Wei-Feng
name: Kivelson, Steven A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The zero temperature phase diagram of the checkerboard Hubbard model is obtained in the solvable limit in which it consists of weakly coupled square plaquettes. As a function of the on-site Coulomb repulsion U and the density of holes per site, x, we demonstrate the existence of at least 16 distinct phases. For instance, at zero doping, the ground state is a novel d-wave Mott insulator (d-Mott), which is not adiabatically continuable to a band insulator; by doping the d-Mott state with holes, depending on the magnitude of U, it gives way to a d-wave superconducting state, a two-flavor spin-1/2 Fermi liquid (FL), or a spin-3/2 FL.
description: 4 pages, 2 figures, minor revisions, published in Phys. Rev. B as a Rapid Communication
¿Son Realmente Importantes Las Tareas Escolares En El Hogar? la importancia del vínculo y entrega de habilidades o conocimientos de padres a hijos en tiempos de cuarentena.
Creators: name: Jara Martínez, Reinaldo
Publisher: name: unknown
Year: 2020
Subjects: subject: Chile
subject: Mental health

description: Artículo que trata sobre la importancia del vínculo y entrega de habilidades o conocimientos de padres a hijos en tiempos de cuarentena producto del COVID-19.
title: Wybrane zagadnienia polskiego prawa prywatnego. Księga pamiątkowa ku czci dr. Józefa Kremisa i dr. Jerzego Strzebinczyka
Creators: name: Jezioro, Julian
name: Zagrobelny, Krzysztof
Publisher: name: E-Wydawnictwo. Prawnicza i Ekonomiczna Biblioteka Cyfrowa. Wydział Prawa, Administracji i Ekonomii Uniwersytetu Wrocławskiego
Year: 2019

description: Monografia przygotowana została w celu uczczenia wkładu naukowego oraz postawy dydaktycznej, życiowej i badawczej doktorów Józefa Kremisa i Jerzego Strzebinczyka, ostatnich uczniów profesora Jana Kosika. Stąd jej tematyka obejmuje wybrane przez autorów zagadnienia prawa prywatnego ze wszystkich działów i dyscyplin tej części regulacji z elementami regulacji publicznoprawnej. Na wstępie zamieszony został jedyny rozdział współautorski zawierający "pięć prawniczych miniatur" poświęconych kolejno - anonimowemu ocenianiu nauczycieli akademickich w aspekcie ochrony dóbr osobistych, ocenie denazyfikacji w powojennych Niemczech, prawu do nieintegracji, jako przejawu prawa do bycia sobą, konceptowi "kontrpośrednika", którego umownym zadaniem byłoby wskazanie ewentualnemu nabywcy wad mieszkania, które zamierza kupić oraz koniowi jako zwierzęciu domowemu de lege lata i de lege ferenda. W następnych rozdziałach poszczególni autorzy, samodzielnie zajęli się następującą problematyka: przedawnieniem roszczeń przysługujących przeciwko konsumentom, ujawnieniem w księdze wieczystej prawa dożywocia, zarządem majątkiem dziecka pozostającego pod władzą rodzicielską, oceną dochowania formy szczególnej czynności prawnej w aspekcie czasowym – na tle wyroku SN z 29 stycznia 2009 r. (V CSK 294/08), sposobem wyrażenia utworu architektonicznego, dorozumianym sposobem zawarcia umowy o podział nieruchomości quoad usum, uprawnieniami majątkowymi przysługującymi małoletniemu w związku ze śmiercią rodzica, stwierdzeniem treści testamentu ustnego, problematyką umowy przewłaszczenia na zabezpieczenia nieruchomości, opcjonalnym prawem umów - w aspekcie zalet i ograniczeń, „rzeczami wyłączonymi z obrotu” (res extra commercium) w polskim porządku prawnym, mechanizmem ochrony pracownic w ciąży będących członkami zarządu spółki, zasadą odpowiedzialności odszkodowawczej za szkodę spowodowaną nieprawidłowym przetwarzaniem danych osobowych (art. 82 RODO), winą i szkodą jako przesłankami odpowiedzialności z art. 430 k.c, niedopuszczalnością umorzenia postępowania o wydanie nakazu zapłaty sumy pieniężnej za naruszenie obowiązków w przedmiocie kontaktów z dzieckiem w przypadku zmiany rozstrzygnięcia formalizującego kontakty, dopuszczalnością zastosowania klauzuli z art. 33 pkt 2 k.r.o. in fine w umowie darowizny o charakterze czysto zobowiązującym oraz zawiłościami i niekonsekwencjami w zakresie formy czynności prawnych – na tle umowy o roboty budowlane.
Magneto-optical behaviour of EuIn_2P_2
Creators: name: Pfuner, F.
name: Ott, L. Degiorgi. H. R.
name: Bianchi, A. D.
name: Fisk, Z.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report results of a magneto-optical investigation of the Zintl-phase compound EuIn$_2$P$_2$. The compound orders magnetically at $T_C$=24 K and exhibits concomitant large magnetoresistance effects. For $T\le$50 K and increasing magnetic fields we observe a transfer of spectral weight in $σ_1(ω)$ from energies above 1 eV into the low-energy metallic component as well as into a mid-infrared signal centered at about 600 cm$^{-1}$. This latter absorption is reminiscent to what has been seen in a large variety of so-called Kondo materials and ascribed to excitations across the hybridization gap. The observed gain of Drude weight upon increasing magnetic field suggests an enhancement of the itinerant charge-carrier concentration due to the increasing magnetization, a phenomenon that was previously observed in other compounds which exhibit colossal magnetoresistive effects.
description: 13 pages, 4 figures
Hybrid Analog and Digital Beamforming Design for Channel Estimation in Correlated Massive MIMO Systems
Creators: name: Mirzaei, Javad
name: ShahbazPanahi, Shahram
name: Sohrabi, Foad
name: Adve, Raviraj
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we study the channel estimation problem in correlated massive multiple-input-multiple-output (MIMO) systems with a reduced number of radio-frequency (RF) chains. Importantly, other than the knowledge of channel correlation matrices, we make no assumption as to the structure of the channel. To address the limitation in the number of RF chains, we employ hybrid beamforming, comprising a low dimensional digital beamformer followed by an analog beamformer implemented using phase shifters. Since there is no dedicated RF chain per transmitter/receiver antenna, the conventional channel estimation techniques for fully-digital systems are impractical. By exploiting the fact that the channel entries are uncorrelated in its eigen-domain, we seek to estimate the channel entries in this domain. Due to the limited number of RF chains, channel estimation is typically performed in multiple time slots. Under a total energy budget, we aim to design the hybrid transmit beamformer (precoder) and the receive beamformer (combiner) in each training time slot, in order to estimate the channel using the minimum mean squared error criterion. To this end, we choose the precoder and combiner in each time slot such that they are aligned to transmitter and receiver eigen-directions, respectively. Further, we derive a water-filling-type expression for the optimal energy allocation at each time slot. This expression illustrates that, with a low training energy budget, only significant components of the channel need to be estimated. In contrast, with a large training energy budget, the energy is almost equally distributed among all eigen-directions. Simulation results show that the proposed channel estimation scheme can efficiently estimate correlated massive MIMO channels within a few training time slots.
description: To appear in IEEE Transactions on Signal Processing 2021
Propagating modes of non-Abelian tensor gauge field of second rank
Creators: name: Konitopoulos, Spyros
name: Savvidy, George
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the recently proposed extension of the YM theory, non-Abelian tensor gauge field of the second rank is represented by a general tensor whose symmetric part describes the propagation of charged gauge boson of helicity two and its antisymmetric part - the helicity zero charged gauge boson. On the non-interacting level these polarizations are similar to the polarizations of the graviton and of the Abelian antisymmetric B field, but the interaction of these gauge bosons carrying non-commutative internal charges cannot be directly identified with the interaction of gravitons or B field. Our intention here is to illustrate this result from different perspectives which would include Bianchi identity for the corresponding field strength tensor and the analysis of the second-order partial differential equation which describes in this theory the propagation of non-Abelian tensor gauge field of the second rank.
description: 22 pages, Latex file
Brownian dynamics of a microswimmer
Creators: name: Lobaskin, Vladimir
name: Lobaskin, Dmitry
name: Kulic, Igor M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We report on dynamic properties of a simple model microswimmer composed of three spheres and propelling itself in a viscous fluid by spinning motion of the spheres under zero net torque constraint. At a fixed temperature and increasing the spinning frequency, the swimmer demonstrates a transition from dissipation-dominated to a pumping-dominated motion regime characterized by negative effective friction coefficient. In the limit of high frequencies, the diffusion of the swimmer can be described by a model of an active particle with constant velocity.
description: Submitted
title: "Balloon-assisted" technique (BAT) in peripheral interventions: a useful tool.
Creators: name: Sacconi, Francesca
Publisher: name: European Congress of Radiology
Year: 2019
Subjects: subject: Aneurysms
subject: Stents
subject: Embolisation
subject: Fluoroscopy
subject: Catheter arteriography
subject: Interventional vascular

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: To describe a particular technique derived from neuroradiologic and cardiologic interventional procedures that can sometimes solve complex situations even in peripheral interventional...
Jet-Driven Disk Accretion in Low Luminosity AGN?
Creators: name: Jolley, Erin J. D.
name: Kuncic, Zdenka
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We explore an accretion model for low luminosity AGN (LLAGN) that attributes the low radiative output to a low mass accretion rate rather than a low radiative efficiency. In this model, electrons are assumed to drain energy from the ions as a result of collisionless plasma microinstabilities. Consequently, the accreting gas collapses to form a geometrically thin disk at small radii and is able to cool before reaching the black hole. The accretion disk is not a standard disk, however, because the radial disk structure is modified by a magnetic torque which drives a jet and which is primarily responsible for angular momentum transport. We also include relativistic effects. We apply this model to the well known LLAGN M87 and calculate the combined disk-jet steady-state broadband spectrum. A comparison between predicted and observed spectra indicates that M87 may be a maximally spinning black hole accreting at a rate of 10^{-3} solar masses per year. This is about 6 orders of magnitude below the Eddington rate for the same radiative efficiency. Furthermore, the total jet power inferred by our model is in remarkably good agreement with the value independently deduced from observations of the M87 jet on kiloparsec scales.
description: ApSS Stromlo 5 Conference Canberra Australia, Dec 2006
MAIN APPROACHES AND TECHNIQUES OF TEACHING ENGLISH VOCABULARY.
Creators: name: Yusupova, Sanobar
Publisher: name: Zenodo
Year: 2023

description: This comprehensive article delves into the multifaceted approaches and techniques employed in teaching English vocabulary, catering to a diverse range of learners and learning styles. Beginning with direct vocabulary instruction, the article explores traditional methods such as word lists and flashcards, providing a solid foundation for language learners. It then delves into contemporary strategies, including contextual learning, multimedia integration, and the incorporation of technology to enhance vocabulary acquisition in real-life contexts.
Brabocetus Colpaert, Bosselaers & Lambert 2015
Creators: name: Colpaert, Wouter
name: Bosselaers, Mark
name: Lambert, Olivier
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Cetacea
Phocoenidae
Brabocetus

description: Genus Brabocetus nov.
Type species: Brabocetus gigaseorum sp. nov., monotypic, see below.
Etymology: From Silvius Brabo, a mythical character who liberated the city of Antwerp from the giant Antigoon, and Latin cetus, whale.
Diagnosis.—Same as for the only included species, B. gigaseorum.
description: Published as part of Colpaert, Wouter, Bosselaers, Mark & Lambert, Olivier, 2015, Out of the Pacific: A second fossil porpoise from the Pliocene of the North Sea Basin, pp. 1-10 in Acta Palaeontologica Polonica 60 (1) on page 2, DOI: 10.4202/app.00115.2014, http://zenodo.org/record/10626269
Spin-triplet superconductor$-$quantum anomalous Hall insulator$-$spin-triplet superconductor Josephson junctions: $0$-$π$ transition, $ϕ_{0}$ phase and switch effects
Creators: name: Cheng, Qiang
name: Yan, Qing
name: Sun, Qing-Feng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the Josephson effect in spin-triplet superconductor$-$quantum anomalous Hall insulator$-$spin-triplet superconductor junctions using the nonequilibrium Green function method. The current-phase difference relations show strong dependence on the orientations of the $\bf{d}$-vectors in superconductors. We focus on two $\bf{d}$-vector configurations, the parallel one with the left and right ${\bf{d}}$-vectors being in the same direction, and the nonparallel one with the left ${\bf{d}}$-vector fixed at the $z$-axis. For the parallel configuration, the $0$-$π$ transition can be realized when one rotates the ${\bf{d}}$-vectors from the parallel to the junction plane to the perpendicular direction. The $ϕ_{0}$ phase with nonzero Josephson current at zero phase difference can be obtained as long as ${d_{x}}{d_{z}}\ne0$. For the nonparallel configuration, the $0$-$π$ transition and the $ϕ_{0}$ phase still exist. The condition for the formation of the $ϕ_{0}$ phase becomes $d_{Rx}\ne0$. The switch effects of the Josephson current are found in both configurations when the ${\bf{d}}$-vectors are rotated in the $xy$ plane. Furthermore, the symmetries satisfied by the current-phase difference relations are analysed in details by the operations of the time-reversal, mirror-reflections, the spin-rotation and the gauge transformation, which can well explain the above selection rules for the $ϕ_{0}$ phase. Our results reveal the peculiar Josephson effect between spin-triplet superconductors and the quantum anomalous Hall insulator, which provide helpful phases and effects for the device designs. The distinct current-phase difference relations for different orientations may be used to determine the direction of the ${\bf{d}}$-vector in the spin-triplet superconductor.
description: 9 pages,4 figures
The formation and ordering of local magnetic moments in Fe-Al alloys
Creators: name: Arzhnikov, A. K.
name: Dobysheva, L. V.
name: Timirgazin, M. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: With density functional theory, studied are the local magnetic moments in Fe-Al alloys depending on concentration and Fe nearest environment. At zero temperature, the system can be in different states: ferromagnetic, antiferromagnetic and spin-spiral waves (SSW) which has a minimum energy. Both SSW and negative moment of Fe atoms with many Al atoms around them agree with experiments. Magnetization curves taken from literature are analysed. Assumption on percolation character of size distribution of magnetic clusters describes well the experimental superparamagnetic behaviour above 150 K.
description: 4 pages, 3 figures (presented in Third Seeheim Conference on Magnetism, 26-30 Aug. 2007, Frankfurt, Germany)
Density Gradient and Absorption Effects in Gas-Filled Magnetic Axion Helioscopes
Creators: name: Creswick, R. J.
name: Nussinov, S.
name: Avignone, F. T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The effects of absorption in the gas, and of density variations on the sensitivity of gas-filled solar-axion helioscopes are theoretically investigated. It is concluded that the 10-meter long CAST helioscope, the most sensitive experiment to date is near the limit of sensitivity in axion mass. Increasing the length, gas density, or tilt angle all have negative influences, and will not improve the sensitivity.
description: 8 pages, 2 figures
Bardeen-Cooper-Schrieffer pairing of composite fermions
Creators: name: Sharma, Anirban
name: Pu, Songyang
name: Jain, J. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Topological pairing of composite fermions has led to remarkable ideas, such as excitations obeying non-Abelian braid statistics and topological quantum computation. We construct a $p$-wave paired Bardeen-Cooper-Schrieffer (BCS) wave function for composite fermions in the torus geometry, which is a convenient geometry for formulating momentum space pairing as well as for revealing the underlying composite-fermion Fermi sea. Following the standard BCS approach, we minimize the Coulomb interaction energy at half filling in the lowest and the second Landau levels, which correspond to filling factors $ν=1/2$ and $ν=5/2$ in GaAs quantum wells, by optimizing two variational parameters that are analogous to the gap and the Debye cut-off energy of the BCS theory. Our results show no evidence for pairing at $ν=1/2$ but a clear evidence for pairing at $ν=5/2$. To a good approximation, the highest overlap between the exact Coulomb ground state at $ν=5/2$ and the BCS state is obtained for parameters that minimize the energy of the latter, thereby providing support for the physics of composite-fermion pairing as the mechanism for the $5/2$ fractional quantum Hall effect. We discuss the issue of modular covariance of the composite-fermion BCS wave function, and calculate its Hall viscosity and pair correlation function. By similar methods, we look for but do not find an instability to $s$-wave pairing for a spin-singlet composite-fermion Fermi sea at half-filled lowest Landau level in a system where the Zeeman splitting has been set to zero.
description: 20 pages, 10 figures
Phantom Dark Energy Models with a Nearly Flat Potential
Creators: name: Scherrer, Robert J.
name: Sen, A. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We examine phantom dark energy models produced by a field with a negative kinetic term and a potential that satisfies the slow roll conditions: [(1/V)(dV/dphi)]^2 << 1 and (1/V)(d^2 V/dphi^2) << 1. Such models provide a natural mechanism to produce an equation of state parameter, w, slightly less than -1 at present. Using techniques previously applied to quintessence, we show that in this limit, all such phantom models converge to a single expression for w(a), which is a function only of the present-day values of Omega_phi and w. This expression is identical to the corresponding behavior of w(a) for quintessence models in the same limit. At redshifts z < 1, this limiting behavior is well fit by the linear parametrization, w=w_0 + w_a(1-a), with w_a \approx -1.5(1+w_0).
description: 4 pages, 2 figures, discussion added, to appear in Phys. Rev. D
Τα ζητήματα της κοινωνικής δικαιοσύνης και της κοινωνικής αδικίας στα εγχειρίδια και στους φακέλους του μαθήματος των Θρησκευτικών Γυμνασίου και Γενικού Λυκείου
Creators: name: Καραμήτρου, Χρυσάνθη Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2025
Subjects: Δικαιοσύνη
Αδικία
Θρησκεία
Χριστιανισμός
Θρησκευτικά
Σχολικά εγχειρίδια
Justice
Injustice
Religion
Christianity
Religion course
School textbooks

description: Σκοπός της διατριβής ήταν η μελέτη των ζητημάτων της κοινωνικής αδικίας και της κοινωνικής δικαιοσύνης, της έκτασης και του τρόπου με τον οποίο παρουσιάζονται στα εγχειρίδια του 2010 και στους φακέλους του 2017 Γυμνασίου και γενικού Λυκείου του μαθήματος των Θρησκευτικών. Η επιλογή των ζητημάτων της κοινωνικής αδικίας και δικαιοσύνης συνδέεται με την κρισιμότητά τους για την ποιότητα των κοινωνικών σχέσεων, την ανάπτυξη της ιδιότητας του πολίτη και της ενεργής πολιτικής ζωής στην κοινωνία. Η επιλογή της ενασχόλησης με τα σχολικά βιβλία των Θρησκευτικών συνδέεται με τη σημασία που έχουν τα σχολικά εγχειρίδια για την οργάνωση της σχολικής γνώσης και υλοποίηση της σχολικής εκπαίδευσης. Στο πρώτο κεφάλαιο εξετάστηκε το ζήτημα της αδικίας και της δικαιοσύνης στα εγχειρίδια Θρησκευτικών Γυμνασίου και Γενικού Λυκείου του 2010. Στο δεύτερο κεφάλαιο εξετάστηκε το ζήτημα της αδικίας και της δικαιοσύνης στους φακέλους του μαθήματος Θρησκευτικών Γυμνασίου και Γενικού Λυκείου. Στο τρίτο κεφάλαιο διατυπώθηκαν κριτικές παρατηρήσεις για τη χριστιανική αντίληψη της αδικίας και της δικαιοσύνης, όπως αυτή αποκαλύπτεται στα βιβλία και στους φακέλους του μαθήματος των Θρησκευτικών που εξετάστηκαν. Στο τέταρτο κεφάλαιο διερευνήθηκε το πλαίσιο και ο τρόπος διδασκαλίας της θρησκείας στα σχολεία και διατυπώθηκα εναλλακτική πρόταση για το ζήτημα αυτό.
description: The purpose of the thesis was to study the issues of social injustice and social justice, the extent and the way in which they are presented in the 2010 textbooks and in the 2017 course files for the Religion course of the Gymnasium and General Lyceum. The choice of the issues of social injustice and justice is linked to their criticality for the quality of social relations, the development of citizenship and active political life in society. The choice of dealing with the Religious course textbooks is linked to the importance that school textbooks have for the organization of school knowledge and the implementation of school education. The first chapter examined the issue of injustice and justice in the 2010 Gymnasium and General Lyceum Religious course textbooks. The second chapter examined the issue of injustice and justice in the 2017 course files of the Religion course of the Gymnasium and General Lyceum. The third chapter concerns critical reflections on the Christian perception of injustice and justice, as revealed in the textbooks and course files of the Religious course that were examined. The fourth chapter explored the context and method of teaching religion in schools and formulated an alternative proposal for this issue.
The thermal width of heavy quarkonia moving in quark gluon plasma
Creators: name: Song, Taesoo
name: Park, Yongjae
name: Lee, Su Houng
name: Wong, Cheuk-Yin
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The velocity dependence of the thermal width of heavy quarkonia traveling with respect to the quark gluon plasma is calculated up to the NLO in perturbative QCD. At the LO, the width decreases with increasing speed, whereas at the NLO it increases with a magnitude approximately proportional to the expectation value of the relative velocity between the quarkonium and a parton in thermal equilibrium. Such an asymptotic behavior is due to the NLO dissociation cross section converging to a nonvanishing value in the high energy limit.
description: 8 pages, 4 figures, references addes. version to be published in Phys. Lett. B
Trained Model for SSD Resnext50_32x4d_fpn pytorch for MLPerf Inference
Creators: name: Kiswani, Ahmad
name: Gonzalez, Pablo
Publisher: name: Zenodo
Year: 2021

description: Application: Single-stage Object Detection Base Model: Resnext50 Framework: pytorch 1.10 Quality: The COCO mAP(IoU=0.50:0.95) on 5000 validation images is 36.7% Precision: single-precision float Is Quantized: no Is ONNX: no Dataset: COCO val-2017
ปริทัศน์ศึกษาการเพิ่มไฮโดรเจนในเชื้อเพลิงก๊าซธรรมชาติอัด
Creators: name: สราวุธ เวชกิจ
name: เรืองเดช ปั่นด้วง
name: ณัฏฐพร พรหมกร
name: พีรายา ศิริพุฒ
name: เยาวธีร อัชวังกุล
name: และบรรยงวุฒิ จุลละโพธิ
Publisher: name: มหาวิทยาลัยมหิดล
Year: 2014
Subjects: ไฮโดรเจน, ก๊าซธรรมชาติอัด,ส่วนผสมเชื้อเพลิง

description: 2, 8, วารสารวิชาการและวิจัย มทร.พระนคร
Spontaneous Magnetic Fluctuations and Collisionless Regulation of Turbulence in the Earth's Magnetotail
Creators: name: Espinoza, C. M.
name: Moya, P. S.
name: Stepanova, M.
name: Valdivia, J. A.
name: Navarro, R. E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Space Physics (physics.space-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Among the fundamental and most challenging problems of laboratory, space, and astrophysical plasma physics is to understand the relaxation processes of nearly collisionless plasmas toward quasi-stationary states; and the resultant states of electromagnetic plasma turbulence. Recently, it has been argued that solar wind plasma $β$ and temperature anisotropy observations may be regulated by kinetic instabilities such as the ion-cyclotron, mirror, electron-cyclotron, and firehose instabilities; and that magnetic fluctuation observations are consistent with the predictions of the Fluctuation-Dissipation theorem, even far below the kinetic instability thresholds. Here, using in-situ magnetic field and plasma measurements by the THEMIS satellite mission, we show that such regulation seems to occur also in the Earth's magnetotail plasma sheet at the ion and electron scales. Regardless of the clear differences between the solar wind and the magnetotail environments, our results indicate that spontaneous fluctuations and their collisionless regulation are fundamental features of space and astrophysical plasmas, thereby suggesting the processes is universal.
description: 11 pages, 3 figures. Accepted for publication in the Astrophysical Journal
AGNIFS survey of local AGN: GMOS-IFU data and outflows in 30 sources
Creators: name: Ruschel-Dutra, D.
name: Storchi-Bergmann, T.
name: Schnorr-Müller, A.
name: Riffel, R. A.
name: de Oliveira, B. Dall'Agnol
name: Lena, D.
name: Robinson, A.
name: Nagar, N.
name: Elvis, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyse optical datacubes of the inner kiloparsec of 30 local ($z\le0.02$) active galactic nuclei (AGN) hosts that our research group, AGNIFS, has collected over the past decade via observations with the integral field units of the Gemini Multi-Object Spectrographs. Spatial resolutions range between $50~{\rm pc}$ and $300~{\rm pc}$ and spectral coverage is from $4800~\mathring{A}$ or $5600~\mathring{A}$ to $7000~\mathring{A}$, at velocity resolutions of $\approx 50~{\rm km~s^{-1}}$. We derive maps of the gas excitation and kinematics, determine the AGN ionisation axis -- which has random orientation relative to the galaxy, and the kinematic major axes of the emitting gas. We find that rotation dominates the gas kinematics in most cases, but is disturbed by the presence of inflows and outflows. Outflows have been found in 21 nuclei, usually along the ionisation axis. The gas velocity dispersion is traced by $W_{80}$ (velocity width encompassing 80 per cent of the line flux), adopted as a tracer of outflows. In 7 sources $W_{80}$ is enhanced perpendicularly to the ionisation axis, indicating lateral expansion of the outflow. We have estimated mass-outflow rates $\dot{M}$ and powers $\dot{E}$, finding median values of $\log\,[\dot{M}/({\rm\,M_\odot\,yr^{-1}})]=-2.1_{-1.0}^{+1.6}$ and $\log\,[\dot{E}/({\rm\,erg\,s^{-1}})]=38.5_{-0.9}^{+1.8}$, respectively. Both quantities show a mild correlation with the AGN luminosity ($L_{\rm AGN}$). $\dot{E}$ is of the order of 0.01 $L_{\rm AGN}$ for 4 sources, but much lower for the majority (9) of the sources, with a median value of $\log\,[\dot{E}/L_{\rm AGN}]=-5.34_{-0.9}^{+3.2}$ indicating that typical outflows in the local Universe are unlikely to significantly impact their host galaxy evolution.
Optical potential parameters of light nuclear fusion based on precise Coulomb wave functions
Creators: name: Wu, Binbing
name: Duan, Hao
name: Liu, Jie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Based on precise Coulomb wave functions (CWFs), we attempt to calculate the fusion cross sections of light nuclei in a complex spherical square-well nuclear potential (i.e., optical potential model). Comparing with experimental benchmark cross section data, we can calibrate optical potential parameters associated with D+D, D+T, D+3He, p+D, p+6Li and p+7Li fusion reactions. Surprisingly, we find that our calculated optical potential parameters are quite different from those of many previous results (e.g., Phys. Rev. C. 61 (2000) 024610, Nucl. Phys. A 986 (2019) 98, etc.), in which approximate Coulomb wave functions (ACWFs) with only retaining the leading terms are exploited for the continuity conditions at the radius of nuclear potential. Furthermore, with the obtained optical potential parameters, we compare the fusion cross sections and astrophysical S-factors with that formulated from ACWFs approach, and also find apparent deviations especially for the fusion reactions with resonance peaks such as D+T and D+3He fusion reactions. We then calculate the phase diagrams of the fusion cross sections with respect to the optical potential parameters and demonstrate several narrow shape resonance belts. It implies that a small deviation of ACWFs from the exact CWFs at nuclear radius might lead to fall off the resonance regimes and therefore causes the big difference on the optical parameters as well as the cross sections.
title: Automated image quality assessment and landmark localisation in ultra-widefield retinal images
Creators: name: Wakeford, Peter Robert
Publisher: name: University of Glasgow
Year: 2021
Subjects: subject: Retinal imaging, retinal image analysis, deep learning, landmark localisation, scanning laser opthalmoscope, automated image quality assessment.

description: Retinal imaging allows assessment of ocular health, and is important for the detection and monitoring of retinal diseases. One such device for imaging the retina is the ultra-wide field of view scanning laser ophthalmoscope (UWFoV-SLO), manufactured by Optos plc, which is capable of imaging up to 200 degrees of the retina in a single scan. This thesis details work in two areas, both relating to the image processing of UWFoV-SLO images. The first is the investigation of automated image quality assessment algorithms for UWFoV-SLO images. A novel image quality metric (referred to as the GVC metric) was developed, which is based on a textural measure of image patches that contain retinal vasculature. This metric is demonstrated to correlate with the assessment of image quality as graded by experts. The GVC metric was applied to images captured at a UWFoV-SLO manufacturing facility, and timeseries analysis of this data discovered a number of potential system modifications that could improve the quality of manufactured devices. These included the correction of a software bug that was impairing image quality, and to install all manufactured devices with a detector that captured higher quality images. These observations were further confirmed with forced-choice preference testing with expert assessors of image quality. The second investigation concerns the automated localisation of two retinal landmarks (the optic disc and fovea) in UWFoV-SLO images with convolutional neural networks. On a test set of 1485 images, optic disc localisation accuracy of 96.70% less than 1 optic disc radius from the ground truth was achieved, and 93.27% of fovea predictions were less than 1 optic disc radius from the ground truth. It is also shown that the laterality of the image (whether it is of the left or right eye) can be reliably inferred from the landmark coordinates. Finally, three methods to automatically detect unreliable landmark predictions are presented. These are based on prior knowledge of the spatial distribution of landmarks --- two methods employ Gaussian mixture models, and the third applies a threshold to the Euclidean distance between the predicted landmark coordinates.
B-Pol: Detecting Primordial Gravitational Waves Generated During Inflation
Creators: name: de Bernardis, Paolo
name: Bucher, Martin
name: Burigana, Carlo
name: Piccirillo, Lucio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: B-Pol is a medium-class space mission aimed at detecting the primordial gravitational waves generated during inflation through high accuracy measurements of the Cosmic Microwave Background (CMB) polarization. We discuss the scientific background, feasibility of the experiment, and implementation developed in response to the ESA Cosmic Vision 2015-2025 Call for Proposals.
description: Experimental Astronomy - The original publication is available at http://www.springerlink.com