cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Gravitational perturbation and quasi-normal modes of charged black holes in Einstein-Born-Infeld gravity
Creators: name: Fernando, Sharmanthie
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Born-Infeld electrodynamics has attracted considerable interest due to its relation to strings and D-branes. In this paper the gravitational perturbations of electrically charged black holes in Einstein-Born-Infeld gravity are studied. Effective potentials for axial perturbations are derived and discussed. The quasi normal modes for the gravitational perturbations are computed using the WKB method. The modes are compared with those of the Reissner-Nordstrom black hole. The relation of the quasi normal modes with the non-linear parameter and the spherical index are also investigated. Comments on stability of the black hole and on future directions are made.
description: 22 pages and 10 figures, references added, figures are replaced and few changes to text is done
WIELKOŚĆ I STRUKTURA DEPOZYTÓW BANKOWYCH ROLNIKÓW INDYWIDUALNYCH W POLSCE A KONIUNKTURA GOSPODARCZA
Creators: name: Utzig, Monika
name: Utzig, Monika
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Financial Economics
subject: bank deposits
subject: individual farmers
subject: economic situation

description: The aim of the paper was to present relationship between bank deposits of individual farmers in Poland and economic situation. The value of individual farmers bank deposits increased about 5-times in the span of 2004-2013. The value of deposit with agreed maturity increased by 90%, when the value of overnight deposits increased by 575%, the share of overnight deposits in individual farmer’s total deposits increased from 83% in 2004 to 94% in 2013. In the article Pearson correlation coefficient between value farmer’s bank deposits growth rate and real GDP growth rate was also calculated. There is no significant correlation between overnight farmer’s bank deposits real growth rate and GDP real growth rate, but positive significant correlation between individual farmer’s deposits with agreed maturity real growth rate and GDP real growth rate was observed.
Quark Confinement Physics from Quantum Chromodynamics
Creators: name: Suganuma, H.
name: Amemiya, K.
name: Tanaka, A.
name: Ichie, H.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We show the construction of the dual superconducting theory for the confinement mechanism from QCD in the maximally abelian (MA) gauge using the lattice QCD Monte Carlo simulation. We find that essence of infrared abelian dominance is naturally understood with the off-diagonal gluon mass $m_{\rm off} \simeq 1.2 {\rm GeV}$ induced by the MA gauge fixing. In the MA gauge, the off-diagonal gluon amplitude is forced to be small, and the off-diagonal gluon phase tends to be random. As the mathematical origin of abelian dominance for confinement, we demonstrate that the strong randomness of the off-diagonal gluon phase leads to abelian dominance for the string tension. In the MA gauge, there appears the macroscopic network of the monopole world-line covering the whole system. We investigate the monopole-current system in the MA gauge by analyzing the dual gluon field $B_μ$. We evaluate the dual gluon mass as $m_B = 0.4 \sim$ 0.5GeV in the infrared region, which is the lattice-QCD evidence of the dual Higgs mechanism by monopole condensation. Owing to infrared abelian dominance and infrared monopole condensation, QCD in the MA gauge is describable with the dual Ginzburg-Landau theory.
description: Invited talk given at KEK-Tanashi International Symposium on Physics of Hadrons and Nuclei, Tokyo, Japan, 14-17 Dec 1998
Hydrodynamical turbulence in eccentric circumbinary discs and its impact on the in situ formation of circumbinary planets
Creators: name: Pierens, Arnaud
name: McNally, Colin P.
name: Nelson, Richard P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Eccentric gaseous discs are unstable to a parametric instability involving the resonant interaction between inertial-gravity waves and the eccentric mode in the disc. We present 3D global hydrodynamical simulations of inviscid circumbinary discs that form an inner cavity and become eccentric through interaction with the central binary. The parametric instability grows and generates turbulence that transports angular momentum with stress parameter $α\sim 5 \times 10^{-3}$ at distances $\lesssim 7 \;a_{bin} $, where $a_{bin}$ is the binary semi-major axis. Vertical turbulent diffusion occurs at a rate corresponding to $α_{diff}\sim 1-2\times 10^{-3}$. We examine the impact of turbulent diffusion on the vertical settling of pebbles, and on the rate of pebble accretion by embedded planets. In steady state, dust particles with Stokes numbers ${\it St} \lesssim 0.1$ form a layer of finite thickness $H_d \gtrsim 0.1 H$, where $H$ is the gas scale height. Pebble accretion efficiency is then reduced by a factor $r_{acc}/H_d$, where $r_{acc}$ is the accretion radius, compared to the rate in a laminar disc. For accreting core masses with $m_p \lesssim 0.1\; M_\oplus$, pebble accretion for particles with ${\it St} \gtrsim 0.5$ is also reduced because of velocity kicks induced by the turbulence. These effects combine to make the time needed by a Ceres-mass object to grow to the pebble isolation mass, when significant gas accretion can occur, longer than typical disc lifetimes. Hence, the origins of circumbinary planets orbiting close to their central binary systems, as discovered by the Kepler mission, are difficult to explain using an in situ model that invokes a combination of the streaming instability and pebble accretion.
description: Accepted in MNRAS
علي عماد محمد ازهر
Creators: name: imad, drali
Publisher: name: figshare
Year: 2021
Subjects: subject: 150203 Financial Institutions (incl. Banking)
subject: FOS: Economics and business

description: علي عماد محمد ازهر - جامعة الشرق الاوكرانية فلاديمير دال
Nuclear effects on generalized parton distributions of 3He
Creators: name: Scopetta, Sergio
Publisher: name: arXiv
Year: 2004
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The relevance of measuring Generalized Parton Distributions (GPDs) of nuclei is stressed and the unique possibilities offered by nuclear few body systems is emphasized. A realistic microscopic calculation of the unpolarized quark GPD Hq3 of the 3He nucleus is reviewed. Nuclear effects are found to be larger than in inclusive deep inelastic scattering, flavor dependent, increasing with the momentum transfer and the asymmetry of the process. They also depend on the choice of the realistic potential. Besides, it is found that nuclear GPDs cannot be factorized into a Delta^2-dependent and a Delta^2-independent term, as suggested in prescription proposed for finite nuclei.
description: 3 pages, 2 figures, talk given at the 19th European Conference on Few-Body Problems in Physics, Groningen, The Netherlands, 23-27 August 2004; to appear in AIP conference proceedings
OCENA STATYSTYCZNA WPŁYWU WYBRANYCH CZYNNIKÓW NA PROCES TECHNICZNEJ MODERNIZACJI GOSPODARSTW RODZINNYCH
Creators: name: Wasąg, Zbigniew
name: Wasąg, Zbigniew
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: statistical evaluation
subject: family holdings
subject: technical modernisation

description: The aim of this study is to determine the effects of the studied factors on the process of technical modernization of holdings in a statistical approach. In 2004-2009 we studied 70 holdings from the Biłgoraj region which benefited from EU subsidies for technical modernization. The evaluation of the relationship between variables was based on Pearson’s correlation coefficients. We analysed the flow of energy expenditure and the amount of subsidies on economic efficiency and the technical modernization of holdings. The results were subjected to analysis of variance to determine the significance of differences of the mean values for the adopted criteria for the categorisation of holdings. The resulting correlation coefficients between selected variables indicate that agricultural technology is not a factor significantly associated with the effects of management : production of goods or the net income of the business. The statistical evaluation shows a high and significant correlation coefficient for the replacement value of means of mechanization and the installed power, and a weaker link between input (kWh ha -1 UR) at a high, although negative, relationship between the cost of mechanization and the size of arable area of a holding.
The S$_0$(0) structure in highly compressed hydrogen and the orientational transition
Creators: name: Grazzi, Francesco
name: Moraldi, Massimo
name: Ulivi, Lorenzo
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A calculation of the rotational S$_0$(0) frequencies in high pressure solid para-hydrogen is performed. Convergence of the perturbative series at high density is demonstrated by the calculation of second and third order terms. The results of the theory are compared with the available experimental data to derive the density behaviour of structural parameters. In particular, a strong increase of the value of the lattice constant ratio $c/a$ and of the internuclear distance is determined. Also a decrease of the anisotropic intermolecular potential is observed which is attributed to charge transfer effects. The structural parameters determined at the phase transition may be used to calculate quantum properties of the rotationally ordered phase.
description: accepted Europhysics Letters
INNOWACJE W PRZEDSIĘBIORSTWACH ZAJMUJĄCYCH SIĘ PRZETWÓRSTWEM MIĘSA W ZALEŻNOŚCI OD POZIOMU NAKŁADÓW NA DZIAŁALNOŚĆ INNOWACYJNĄ
Creators: name: Wasilewska, Anna
name: Wasilewska, Anna
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: product innovations
subject: process innovations
subject: marketing innovations
subject: organizational innovations
subject: quality of innovations

description: The research is focused on enterprises dealing with the meat processing, which made expenditures on innovations in the period 2005-2010 and introduced the change in products, processes, organization and marketing. The product innovations were most common and they were introduced by 56.7% of enterprises. Usually they were linked to the other change. Implemented process innovations were mostly focused on the change of production methods, less on methods supporting the processes or operational systems related to the purchases or accountancy. The number of enterprises, which implemented the above change, increased along with the input level on innovations. Furthermore the change in marketing was introduced more often than organizational innovations. Predominantly marketing innovations were related to the utilisation of new media or promotion techniques.
RYNEK CIĄGNIKÓW ROLNICZYCH W POLSCE W LATACH 2001-2012
Creators: name: Zając, Stanisław
name: Izdebski, Waldemar
name: Skudlarski, Jacek
name: Zając, Stanisław
name: Izdebski, Waldemar
name: Skudlarski, Jacek
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: tractor
subject: supply
subject: demand
subject: imports
subject: exports

description: The aim of the study was to analyze changes in the domestic market of agricultural tractors in Poland in the years 2001-2012. The scope of the research included presentation of the volume of production, import and export of new and used agricultural tractors. To achieve the objective of the research national literature and mass statistics were used. Studies have shown that the domestic market for agricultural tractors reflected significant variations regarding the volume of production, imports and exports, and consequently, their supply that can be explained by unregulated demand. The demand for tractors was undoubtedly due to changes taking place in the Polish countryside during the period. Thanks to the EU demand for tractors was high. Demand for agricultural tractors of high power increased. Since 2006, the greatest demand was for tractors with an engine power of 59-75 kW. In the analyzed period, the production of tractors was 66 203 units and the largest share (57.9% – 38 299 units) was for tractors with the lowest power range of 18-37 kW. A total of 120 415 units of new tractors was imported, which is 181.9% of the national production of tractors. The supply of new agricultural tractors amounted to 149 562 units. In the years 2001-2012 the domestic market was supplied by a total of 49307 used tractors, which accounted for 33.0% of the supply of new agricultural tractors.
Constructing N-qubit entanglement monotones from anti-linear operators
Creators: name: Osterloh, Andreas
name: Siewert, Jens
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a method to construct entanglement measures for pure states of multipartite qubit systems. The key element of our approach is an antilinear operator that we call {\em comb} in reference to the {\em hairy-ball theorem}. For qubits (or spin 1/2) the combs are automatically invariant under $SL(2,\CC)$. This implies that the {\em filters} obtained from the combs are entanglement monotones by construction. We give alternative formulae for the concurrence and the 3-tangle as expectation values of certain antilinear operators. As an application we discuss inequivalent types of genuine four-qubit entanglement.
description: 5 pages, revtex4; more detailed illustration of the method
Bridging the reality gap in quantum devices with physics-aware machine learning
Creators: name: Craig, D. L.
name: Moon, H.
name: Fedele, F.
name: Lennon, D. T.
name: Van Straaten, B.
name: Vigneau, F.
name: Camenzind, L. C.
name: Zumbühl, D. M.
name: Briggs, G. A. D.
name: Osborne, M. A.
name: Sejdinovic, D.
name: Ares, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The discrepancies between reality and simulation impede the optimisation and scalability of solid-state quantum devices. Disorder induced by the unpredictable distribution of material defects is one of the major contributions to the reality gap. We bridge this gap using physics-aware machine learning, in particular, using an approach combining a physical model, deep learning, Gaussian random field, and Bayesian inference. This approach has enabled us to infer the disorder potential of a nanoscale electronic device from electron transport data. This inference is validated by verifying the algorithm's predictions about the gate voltage values required for a laterally-defined quantum dot device in AlGaAs/GaAs to produce current features corresponding to a double quantum dot regime.
New perspectives on segmented crystal calorimeters for future colliders
Creators: name: Lucchini, Marco T.
name: Chung, Wonyong
name: Eno, Sarah C.
name: Lai, Yihui
name: Lucchini, Lorenzo
name: Nguyen, Minh-Thi
name: Tully, Christopher G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Crystal calorimeters have a long history of pushing the frontier on high-resolution electromagnetic (EM) calorimetry. We explore in this paper major innovations in collider detector performance that can be achieved with crystal calorimetry when longitudinal segmentation and dual-readout capabilities are combined with a new high EM resolution approach to PFA in multi-jet events, such as $e^+e^+\rightarrow HZ$ events in all-hadronic final-states at Higgs factories. We demonstrate a new technique for pre-processing $π^0$ momenta through combinatoric di-photon pairing in advance of applying jet algorithms. This procedure significantly reduces $π^0$ photon splitting across jets in multi-jet events. The correct photon-to-jet assignment efficiency improves by a factor of 3 with a $3\%/\sqrt{E}$ EM resolution. In addition, the technique of bremsstrahlung photon recovery significantly improves electron momentum measurements. A high EM resolution calorimeter increases the Z boson recoil mass resolution in Higgstrahlung events for decays into electron pairs to 80% of that for muon pairs. We present the design and optimization of a highly segmented crystal detector concept that achieves the required energy resolution, and a time resolution better than 30 ps providing exceptional particle identification capabilities. We demonstrate that, contrary to previous detector designs that suffered from large neutral hadron resolution degradation from one interaction length of crystals in front of a sampling hadron calorimeter, the implementation of dual-readout on crystals permits to achieve a resolution better than $30\%/\sqrt{E}\oplus 2\%$ for neutral hadrons. Our studies find that the integration of crystal calorimetry into future Higgs factory collider detectors can open new perspectives by yielding the highest level of combined EM and neutral hadron resolution in the PFA paradigm.
Strong self-induced nonreciprocal transmission by using nonlinear PT-symmetric epsilon-near-zero metamaterials
Creators: name: Jin, Boyuan
name: Argyropoulos, Christos
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Nonreciprocal transmission is the fundamental process behind unidirectional wave propagation phenomena. In our work, a compact and practical parity-time (PT) symmetric metamaterial is designed based on two Silicon Carbide (SiC) media separated by an air gap and photonically doped with gain and loss defects. We demonstrate that an exceptional point (EP) is formed in this PT-symmetric system when SiC operates as a practical epsilon-near-zero (ENZ) material and by taking into account its moderate optical loss. Furthermore and even more importantly, strong self-induced nonreciprocal transmission is excited due to the nonlinear Kerr effect at a frequency slightly shifted off the EP but without breaking the PT-symmetric phase. The transmittance from one direction is exactly unity while the transmittance from the other direction is decreased to very low values, achieving very high optical isolation. The proposed active nonlinear metamaterial overcomes the fundamental physical bounds on nonreciprocity compared with a passive nonlinear nonreciprocal resonator. The strong self-induced nonreciprocal transmission arises from the extreme asymmetric field distribution achieved upon excitation from opposite incident directions. The significant enhancement of the electric field in the defects effectively decreases the required optical power to trigger the presented nonlinear response. This work can have a plethora of applications, such as nonreciprocal ultrathin coatings for the protection of sources or other sensitive equipment from external pulsed signals, circulators, and isolators.
Resonant propagation of x-rays from the linear to the nonlinear regime
Creators: name: Li, Kai
name: Labeye, Marie
name: Ho, Phay J.
name: Gaarde, Mette B.
name: Young, Linda
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a theoretical study of temporal, spectral, and spatial reshaping of intense, ultrafast x-ray pulses propagating through a resonant medium. Our calculations are based on the solution of a 3D time-dependent Schrödinger-Maxwell equation, with the incident x-ray photon energy on resonance with the core-level 1s-3p transition in neon. We study the evolution of the combined incident and medium-generated field, including the effects of stimulated emission, absorption, ionization and Auger decay, as a function of the input pulse energy and duration. We find that stimulated Raman scattering between core-excited states $1s^{-1}3p$ and $2p^{-1}3p$ occurs at high x-ray intensity, and that the emission around this frequency is strongly enhanced when also including the similar $1s^{-1}-2p^{-1}$ response of the ion. We also explore the dependence of x-ray self-induced transparency (SIT) and self-focusing on the pulse intensity and duration, and we find that the stimulated Raman scattering plays an important role in both effects. Finally, we discuss how these nonlinear effects may potentially be exploited as control parameters for pulse properties of x-ray free-electron laser sources.
description: 14 pages, 11 figures
Random-reshuffled SARAH does not need a full gradient computations
Creators: name: Beznosikov, Aleksandr
name: Takáč, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: The StochAstic Recursive grAdient algoritHm (SARAH) algorithm is a variance reduced variant of the Stochastic Gradient Descent (SGD) algorithm that needs a gradient of the objective function from time to time. In this paper, we remove the necessity of a full gradient computation. This is achieved by using a randomized reshuffling strategy and aggregating stochastic gradients obtained in each epoch. The aggregated stochastic gradients serve as an estimate of a full gradient in the SARAH algorithm. We provide a theoretical analysis of the proposed approach and conclude the paper with numerical experiments that demonstrate the efficiency of this approach.
description: 20 pages, 2 algorithms, 5 figures, 3 tables
SELD-TCN: Sound Event Localization & Detection via Temporal Convolutional Networks
Creators: name: Guirguis, Karim
name: Schorn, Christoph
name: Guntoro, Andre
name: Abdulatif, Sherif
name: Yang, Bin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Machine Learning (cs.LG)
subject: Sound (cs.SD)
subject: Machine Learning (stat.ML)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: The understanding of the surrounding environment plays a critical role in autonomous robotic systems, such as self-driving cars. Extensive research has been carried out concerning visual perception. Yet, to obtain a more complete perception of the environment, autonomous systems of the future should also take acoustic information into account. Recent sound event localization and detection (SELD) frameworks utilize convolutional recurrent neural networks (CRNNs). However, considering the recurrent nature of CRNNs, it becomes challenging to implement them efficiently on embedded hardware. Not only are their computations strenuous to parallelize, but they also require high memory bandwidth and large memory buffers. In this work, we develop a more robust and hardware-friendly novel architecture based on a temporal convolutional network(TCN). The proposed framework (SELD-TCN) outperforms the state-of-the-art SELDnet performance on four different datasets. Moreover, SELD-TCN achieves 4x faster training time per epoch and 40x faster inference time on an ordinary graphics processing unit (GPU).
description: 5 pages, 3 tables, 2 figures. Submitted to EUSIPCO 2020
Dose-response relationships of inhaled salbutamol in competitive non-asthmatic athletes : effects on performance and urine concentrations
Creators: name: Sporer, Benjamin Carson
Publisher: name: University of British Columbia
Year: 2011

description: Currently, the World Anti-Doping Agency (WADA) permits asthmatic athletes to use inhaled salbutamol (SAL) to help attenuate compromised lung function during exercise. Although the majority of previous research shows no benefit in non-asthmatic athletes, there lacks an examination of the dose-response effect of SAL on performance using a sport-specific evaluation. Additionally, there lacks a description of how dose affects the concentration of SAL in the urine (cSAL). We hypothesized that salbutamol would have no effect on performance in non-asthmatic athletes and that cSAL would be affected by dose and be highly variable. Three projects were completed. Study 1 established the typical error and reliability of time-trial performance using the Velotron cycle ergometer. Highly trained, male cyclists performed three 20-km time-trials (TT) demonstrating the test to be highly reliable with low coefficients of variance for power and time (1.8-2.0% and 0.8-1.0% respectively). In Study 2, lung function was positively affected by SAL and urine analysis revealed a dose-response relationship with cSAL while at rest, up to a dose 800μg. Peak values were observed at 60min post-inhalation and cSAL was highly variable at each time point. Although several samples approached the WADA limit of 1000 ngml⁻¹, none exceeded this value. Using doses of 200μg, 400μg, and 800μg, Study 3 revealed no effects of SAL on time-trial performance or physiological measures over placebo. Additionally, athlete perception of leg and breathing effort was unaffected across conditions. Similar to Study 2, cSAL was related to dose and highly variable, with no samples resulting in a doping violation. SG was found to be significantly related to cSAL and when corrected to a dehydrated state, several samples exceeded the WADA limit. In summary, these findings allow us to accept the hypothesis that acute inhalation of SAL lacks ergogenic properties in non-asthmatic athletes and does not affect ventilation or metabolic parameters during exercise. Additionally, inhaled SAL does not appear to alter athlete perceptions of effort. The findings further suggest that urine samples will generally fall below the WADA limit following therapeutic doses of SAL, although this may be affected by hydration.
Open Data and Quantitative Techniques for Anthropology of Road Traffic
Creators: name: Žagar, Ajda Pretnar
name: Hočevar, Tomaž
name: Curk, Tomaž
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: What kind of questions about human mobility can computational analysis help answer? How to translate the findings into anthropology? We analyzed a publicly available data set of road traffic counters in Slovenia to answer these questions. The data reveals interesting information on how a nation drives, how it travels for tourism, which locations it prefers, what it does during the week and the weekend, and how its habits change during the year. We conducted the empirical analysis in two parts. First, we defined interesting traffic spots and designed computational methods to find them in a large data set. As shown in the paper, traffic counters hint at potential causes and effects in driving practices that we can interpret anthropologically. Second, we used clustering to find groups of similar traffic counters as described by their daily profiles. Clustering revealed the main features of road traffic in Slovenia. Using the two quantitative approaches, we outline the general properties of road traffic in the country and identify and explain interesting outliers. We show that quantitative data analysis only partially answers anthropological questions, but it can be a valuable tool for preliminary research. We conclude that open data are a useful component in an anthropological analysis and that quantitative discovery of small local events can help us pinpoint future fieldwork sites.
description: 17 pages, 7 figures
Poloidal inhomogeneity of the particle fluctuation induced fluxes near of the LCFS at lower hybrid heating and improved confinement transition at the FT-2 tokamak
Creators: name: Lashkul, Sergei
name: Shatalin, Sergei
name: Altukhov, Alexei
name: Gurchenko, Alexei
name: Gusakov, Evgenii
name: Dyachenko, Valerii
name: Esipov, Lev
name: Kantor, Mihail
name: Kouprienko, Denis
name: Stepanov, Alexsandr
name: Sharpeonok, Andrei
name: Vekshina, Elena
Publisher: name: arXiv
Year: 2004
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: This paper deals with the new spectral and microturbulence experimental data and their analysis, which show, that the radial electric field Er generated at the LH heating (LHH) in the FT-2 is high enough to form the transport barriers. The ETB is formed when LHH is switched off. The radial fluctuation-induced EB drift flux densities near LCFS in SOL are measured at two different poloidal angles. For this purpose two Langmuir probes located at low and high field sides of the torus are used. Registration of the poloidal and radial components of the electric field and density fluctuations at the same time during one discharge permits to measure the poloidal asymmetry of the transport reduction mechanism of the radial and poloidal particle fluxes in the SOL. The absolute E(~) fluctuation levels show dependence on the sign of Er shear. The modification of the microscale turbulence by the poloidal Er x B rotation shear EB at the L - H transition near LCFS is also studied by X-mode fluctuation Reflectometry. The new data were obtained by spatial spectroscopic technique.
description: 12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France)
Mixed moduli in 3d N=4 higher-genus quivers
Creators: name: Lavdas, Ioannis
name: Floch, Bruno Le
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze exactly marginal deformations of 3d N=4 Lagrangian gauge theories, especially mixed-branch operators with both electric and magnetic charges. These mixed-branch moduli can either belong to products of electric and magnetic current supermultiplets, or be single-trace (non-factorizable). Apart from some exceptional quivers that have additional moduli, 3d N=4 theories described by genus g quivers with nonabelian unitary gauge groups have exactly g single-trace mixed moduli, which preserve the global flavour symmetries. This partly explains why only linear and circular quivers have known AdS_4 supergravity duals. Indeed, for g>1, AdS_4 gauged supergravities cannot capture the entire g-dimensional moduli space even if one takes into account the quantization moduli of boundary conditions. Likewise, in a general Lagrangian theory, we establish (using the superconformal index) that the number of single-trace mixed moduli is bounded below by the genus of a graph encoding how nonabelian gauge groups act on hypermultiplets.
description: 53 pages. v2: Lower bound strengthened, Section 5 added with classes of examples, references corrected. v3: comment on star-shaped quivers (matches published version)
Modeling viscoelastic flow with discrete methods
Creators: name: Somfai, Ellak
name: Morozov, Alexander N.
name: van Saarloos, Wim
Publisher: name: arXiv
Year: 2004
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The hydrodynamics of viscoelastic materials (for example polymer melts and solutions) presents interesting and complex phenomena, for example instabilities and turbulent flow at very low Reynolds numbers due to normal stress effects and the existence of a finite stress relaxation time. This present work is motivated by renewed interest in instabilities in polymer flow. The majority of currently used numerical methods discretize a constitutive equation on a grid with finite difference or similar methods. We present work in progress in which we simulate viscoelastic flow with dissipative particle dynamics. The advantage of this approach is that many of the numerical instabilities of conventional methods can be avoided, and that the model gives clear physical insight into the origins of many viscoelastic flow instabilities.
description: 8 pages, 4 figures, was presented on DSFD-2004
Agile and DevOps: A Unified Framework for Continuous Delivery and Operational Excellence
Creators: name: Rishitha Kokku
Publisher: name: Zenodo
Year: 2024

description: In this fast paced world of Software Development, organizations are always looking for avenues to improve product quality and customer satisfaction. This article looks at integrating Agile and DevOps methodologies as a strategic approach to meet these objectives. While Agile is an approach that promotes incremental development and adaptability to change, DevOps relies on a set of software development practices like Continuous Integration/ Continuous Delivery (CICD). The combination of these approaches reduces time-to-market, increases product quality and reliability, and feeds a culture of innovation and collective ownership amongst the team members. Although the potential upsides are well worth the investment, in many cases, there remain risks around cultural response, alignment of processes, technical complexity and talent deficiencies in making them operational. These challenges can be addressed by incorporating best practices such as fostering a culture of collaboration, unifying workflows, utilizing automation and scaling, emphasizing continuous incremental learning opportunities and integrating security standards when deploying software/infrastructure in the cloud.
Novel curved solitons of integrable (2 +1) dimensional KMN equation
Creators: name: Mukherjee, Abhik
Publisher: name: arXiv
Year: 2020
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: In this letter, the unique exact lump and topological soliton solutions of integrable (2+1) dimensional Kundu Mukherjee Naskar (KMN) equation are obtained. These solutions have an unusual property that they can get curved in the plane arbitrarily due to the presence of an arbitrary function of space(x) and time(t) in their analytic forms. Due to this special feature, the solutions can be used to model the bending of optical solitonic beam, different types of wave structures in real physical experimental conditions. This novel feature, which is a rare property for a constant coefficient completely integrable equation, arises due to the Galilean co-variance property and current like nonlinearity present in the KMN equation.
description: 5 pages, 2 figures
Localized big bang stability for the Einstein-scalar field equations
Creators: name: Beyer, Florian
name: Oliynyk, Todd A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We prove the nonlinear stability in the contracting direction of Friedmann-Lemaître-Robertson-Walker (FLRW) solutions to the Einstein-scalar field equations in $n\geq 3$ spacetime dimensions that are defined on spacetime manifolds of the form $(0,t_0]\times \mathbb{T}^{n-1}$, $t_0>0$. Stability is established under the assumption that the initial data is \textit{synchronized}, which means that on the initial hypersurface $Σ= \{t_0\}\times \mathbb{T}^{n-1}$ the scalar field $τ= \exp\bigl(\sqrt{\frac{2(n-2)}{n-1}}ϕ\bigr) $ is constant, that is, $Σ=τ^{-1}(\{t_0\})$. As we show that all initial data sets that are sufficiently close to FRLW ones can be evolved via the Einstein-scalar field equation into new initial data sets that are \textit{synchronized}, no generality is lost by this assumption. By using $τ$ as a time coordinate, we establish that the perturbed FLRW spacetime manifolds are of the form $M = \bigcup_{t\in (0,t_0]}τ^{-1}(\{t\})\cong (0,t_0]\times \mathbb{T}^{n-1}$, the perturbed FLRW solutions are asymptotically pointwise Kasner as $τ\searrow 0$, and a big bang singularity, characterised by the blow up of the scalar curvature, occurs at $τ=0$. An important aspect of our past stability proof is that we use a hyperbolic gauge reduction of the Einstein-scalar field equations. As a consequence, all of the estimates used in the stability proof can be localized and we employ this property to establish a corresponding localized past stability result for the FLRW solutions.
description: Final version; agrees with published article
Restoration of chiral symmetry in excited hadrons
Creators: name: Glozman, L. Ya.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Physics of the low-lying and high-lying hadrons in the light flavor sector is reviewed. While the low-lying hadrons are strongly affected by the spontaneous breaking of chiral symmetry, in the high-lying hadrons the chiral symmetry is restored. A manifestation of the chiral symmetry restoration in excited hadrons is a persistence of the chiral multiplet structure in both baryon and meson spectra. Meson and baryon chiral multiplets are classified. A relation between the chiral symmetry restoration and the string picture of excited hadrons is discussed.
description: Lectures given at the XLIV Cracow School of Theoretical Physics, Zakopane, Poland, 28.05 - 06.06.2004. It also partly covers lectures given at the school "QCD and Light Hadrons", Beijing, China, September 26 - 30, 2004. 33 pp., LaTeX
On the Evolution of the Globular Cluster System in NGC 1052-DF2: Dynamical Friction, Globular-Globular Interactions and Galactic Tides
Creators: name: Chowdhury, Dhruba Dutta
name: Bosch, Frank C. van den
name: van Dokkum, Pieter
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The ultra-diffuse galaxy NGC 1052-DF2 has an overabundance of luminous globular clusters (GCs), and its kinematics is consistent with the presence of little to no dark matter. As the velocity dispersion among the GCs is comparable to the expected internal dispersions of the individual GCs, the galaxy might be highly conducive to GC-GC merging. If true, this could explain the puzzling luminosity function of its GCs. Here, we examine this possibility by re-simulating three of our earlier simulations of the GC system (Dutta Chowdhury et al. 2019), where the GCs were modeled as single particles, with live GCs. Somewhat surprisingly, we infer a low merger rate of $\sim 0.03\ \rm Gyr^{-1}$. The main reason is that the GCs are too dense for tidal shock capture, caused by impulsive encounters among them, to operate efficiently (we infer a tidal capture rate of only $\sim 0.002\ \rm Gyr^{-1}$). Therefore, whatever mergers occur are driven by other mechanisms, which we find to be captures induced by dynamical friction and compressive tides from other GCs. The low merger rate inferred here makes it unlikely that the unusually large luminosities of the GCs can be explained as a result of past GC-GC mergers. Our simulations also indicate that, if NGC 1052-DF2 is indeed largely devoid of dark matter, its tidal field is too weak to induce any significant mass loss from the GCs. Therefore, in such a scenario, we predict that it is improbable for the GCs to reveal tidal features, something that can be tested with future deep observations.
description: 20 pages, 10 figures, minor revisions, accepted for publication in ApJ
Einstein-type structures, Besse's conjecture and a uniqueness result for a $φ$-CPE metric in its conformal class
Creators: name: Colombo, Giulio
name: Mari, Luciano
name: Rigoli, Marco
Publisher: name: arXiv
Year: 2022
Subjects: subject: Differential Geometry (math.DG)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this paper, we study an extension of the CPE conjecture to manifolds $M$ which support a structure relating curvature to the geometry of a smooth map $φ: M \to N$. The resulting system, denoted by $(φ-\mathrm{CPE})$, is natural from the variational viewpoint and describes stationary points for the integrated $φ$-scalar curvature functional restricted to metrics with unit volume and constant $φ$-scalar curvature. We prove both a rigidity statement for solutions to $(φ-\mathrm{CPE})$ in a conformal class, and a gap theorem characterizing the round sphere among manifolds supporting $(φ-\mathrm{CPE})$ with $φ$ a harmonic map.
description: 26 pages. Package axessibility included to make the paper available to visually impaired people. Revised version: the rigidity theorem was improved in the light of a result by Barbosa, Mirandola and Vitorio. We included comments and corrected a mistake in the variational formulation
Tunable THz generation and enhanced nonlinear effects with active and passive graphene hyperbolic metamaterials
Creators: name: Jin, Boyuan
name: Guo, Tianjing
name: Zhu, Liang
name: Chen, Pai-Yen
name: Argyropoulos, Christos
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The active and nonlinear graphene properties are limited due to weak light matter interaction between the ultrathin graphene and the incident light. In this work, we present enhanced nonlinear effects at the low terahertz (THz) range by designing a new patterned graphene hyperbolic metamaterial (GHMM). More specifically, it is demonstrated that the third harmonic generation (THG) can be significantly enhanced by the proposed GHMM due to the field enhancement at the resonance as well as the supported slow light response that fosters strong light matter interaction.
Promoting inclusiveness in ESiWACE3 training and events
Creators: name: Arista-Romero, Maria
name: Brown, Nikki
Publisher: name: Zenodo
Year: 2025

description: ESiWACE3 is committed to fostering engagement strategies that promote a more inclusive and diverse community. To support a welcoming and diverse community of Earth system modelling across Earth system sciences and high-performance computing, we are implementing activities to create a more equitable environment, focusing on addressing gender and geographical diversity.Our events engage members of the HPC scientifi c community, technology providers, and users. We have adopted some guidelines to ensure they are as inclusive as possible. These are intended to help those planning, organising and running ESiWACE3 events to ensure that the events are open, welcoming and benefi cial to all. Not all points in the following checklists will be relevant every time, but we hope that they will serve as reminders of the areas to think about at each stage of the planning and organisation process.
The influence of cultural values on physical activity among female adolescents from the Indian diaspora
Creators: name: Ramanathan, Subha
Publisher: name: University of British Columbia
Year: 2010

description: This study investigated how physical activity (PA) patterns among female adolescents from the Indian diaspora have been influenced by Indian traditions, beliefs and values. This research was conceived from a model of adolescent PA from Welk, Wood and Morss (2003), who studied the role of parents on PA using Social Cognitive Theory, and from a set of cultural values from Unger, Ritt-Olsen, Teran, Huang, Hoffman and Palmer (2002), who studied health risk behaviours. As parents are generally the foremost educators of cultural knowledge, their potentially concurrent influence on PA was a key area of interest for this project. The main research question was: What role do personal, peer, parental and cultural attitudes towards PA have on actual PA behaviour among female adolescents in Canada from the Indian diaspora? Six girls aged 15-18 participated in an individual interview followed by a focus group. While each one of them made distinct contributions to this research, there were shared experiences. PA was considered to be important for physical and mental health. Participants who felt strong affinity for Indian culture also linked PA to spiritual health; this theme of spirituality is a unique contribution to adolescent PA literature. Among all participants, PA was thought to strengthen relationships with family. Parents supported physical activities by playing games with their daughters and also provided encouragement and filled facilitative roles. When discussing Indian culture, participants indicated that males and females were raised to fulfill different roles: females were raised to become wives and mothers while males were taught to be independent. As expected, differentiated gender roles also emerged while discussing sporting behaviours. In general, boys were deemed more aggressive, assertive and competitive in PA; girls were perceived to promote fun-based learning environments. Popular media was cited as a major influence in differentially shaping boys’ and girls’ physiques. This study gave voice to a group of adolescent girls from the Indian diaspora while integrating existing literature on personal and parental attitudes towards physical activity with cultural values. Future research should address concepts of spiritual health and family values among adolescents from other diasporic subcultures in Canada.
Temporal atomization of a transcritical liquid n-decane jet into oxygen
Creators: name: Poblador-Ibanez, Jordi
name: Sirignano, William A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The injection of liquid fuel at supercritical pressures is a relevant but overlooked topic in combustion. Typically, the role of two-phase dynamics is neglected under the assumption that the liquid rapidly transitions to a supercritical state. However, a transcritical domain exists where a sharp phase interface remains. This scenario is the common case in the early times of liquid fuel injection under real-engine conditions involving hydrocarbon fuels. Under such conditions, the dissolution of the oxidizer species into the liquid phase is accelerated due to local thermodynamic phase equilibrium (LTE) and vaporization or condensation can occur at multiple locations along the interface at the same time. Fluid properties vary under species and thermal mixing, with similar liquid and gas mixtures near the interface. As a result of the combination of low, varying surface-tension force and gas-like liquid viscosities, small surface instabilities develop early. The mixing process, interface thermodynamics, and early deformation of a cool liquid n-decane jet surrounded by a hotter moving gas initially composed of pure oxygen are analyzed at various ambient pressures and gas velocities. A two-phase, low-Mach-number flow solver for variable-density fluids is used. The interface is captured using a split Volume-of-Fluid method, generalized for a non-divergence-free liquid velocity and mass exchange across the interface. The importance of transcritical mixing effects over time for increasing pressures is shown. Initially, local deformation features differ considerably from previous incompressible works. Then, the minimal surface-tension force is responsible for the generation of overlapping liquid layers in favor of the classical atomization into droplets. Thus, surface-area growth at transcritical conditions is mainly a consequence of gas-like deformations under shear rather than spray formation.
description: 62 pages, 30 figures