cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Nonlinear saturation of the Weibel instability
Creators: name: Cagas, Petr
name: Hakim, Ammar
name: Scales, Wayne
name: Srinivasan, Bhuvana
Publisher: name: arXiv
Year: 2017
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The growth and saturation of magnetic fields due to the Weibel instability (WI) have important implications for laboratory and astrophysical plasmas, and this has drawn significant interest recently. Since the WI can generate a large magnetic field from no initial field, the maximum magnitudes achieved can have significant consequences for a number of applications. Hence, an understanding of the detailed dynamics driving the nonlinear saturation of the WI is important. This work considers the nonlinear saturation of the WI when counter-streaming populations of initially unmagnetized electrons are perturbed by a magnetic field oriented perpendicular to the direction of streaming. Previous works have found magnetic trapping to be important and connected electron skin depth spatial scales to the nonlinear saturation of the WI. 2 Results presented in this work are consistent with these findings for a high-temperature case. However, using a high-order continuum kinetic simulation tool, this work demonstrates that, when the electron populations are colder, a significant electrostatic potential develops that works with the magnetic field to create potential wells. The electrostatic field develops due to transverse flows induced by the WI, and in some cases is strengthened by a secondary instability. This field plays a key role in saturation of the WI for colder populations. The role of the electrostatic potential in Weibel instability saturation has not been studied in detail previously.
description: 8 pages, 8 figures
Holographic self-tuning of the cosmological constant
Creators: name: Charmousis, Christos
name: Kiritsis, Elias
name: Nitti, Francesco
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a brane-world setup based on gauge/gravity duality in which the four-dimensional cosmological constant is set to zero by a dynamical self-adjustment mechanism. The bulk contains Einstein gravity and a scalar field. We study holographic RG flow solutions, with the standard model brane separating an infinite volume UV region and an IR region of finite volume. For generic values of the brane vacuum energy, regular solutions exist such that the four-dimensional brane is flat. Its position in the bulk is determined dynamically by the junction conditions. Analysis of linear fluctuations shows that a regime of 4-dimensional gravity is possible at large distances, due to the presence of an induced gravity term. The graviton acquires an effective mass, and a five-dimensional regime may exist at large and/or small scales. We show that, for a broad choice of potentials, flat-brane solutions are manifestly stable and free of ghosts. We compute the scalar contribution to the force between brane-localized sources and show that, in certain models, the vDVZ discontinuity is absent and the effective interaction at short distances is mediated by two transverse graviton helicities.
description: 65 pages plus appendixes, 18 figures. Minor correction of numerical factors in sections 4, 5 and appendix D
Automatic Identification of Scenedesmus Polymorphic Microalgae from Microscopic Images
Creators: name: Giraldo-Zuluaga, Jhony-Heriberto
name: Diez, Geman
name: Gomez, Alexander
name: Martinez, Tatiana
name: Vasquez, Mariana Peñuela
name: Bonilla, Jesus Francisco Vargas
name: Salazar, Augusto
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Microalgae counting is used to measure biomass quantity. Usually, it is performed in a manual way using a Neubauer chamber and expert criterion, with the risk of a high error rate. This paper addresses the methodology for automatic identification of Scenedesmus microalgae (used in the methane production and food industry) and applies it to images captured by a digital microscope. The use of contrast adaptive histogram equalization for pre-processing, and active contours for segmentation are presented. The calculation of statistical features (Histogram of Oriented Gradients, Hu and Zernike moments) with texture features (Haralick and Local Binary Patterns descriptors) are proposed for algae characterization. Scenedesmus algae can build coenobia consisting of 1, 2, 4 and 8 cells. The amount of algae of each coenobium helps to determine the amount of lipids, proteins, and other substances in a given sample of a algae crop. The knowledge of the quantity of those elements improves the quality of bioprocess applications. Classification of coenobia achieves accuracies of 98.63% and 97.32% with Support Vector Machine (SVM) and Artificial Neural Network (ANN), respectively. According to the results it is possible to consider the proposed methodology as an alternative to the traditional technique for algae counting. The database used in this paper is publicly available for download.
description: This is a pre-print of an article published in Pattern Analysis and Applications. The final authenticated version is available online at: https://doi.org/10.1007/s10044-017-0662-3, Pattern Anal Applic (2017)
Fully quantum description of the Zundel ion: combining variational quantum Monte Carlo with path integral Langevin dynamics
Creators: name: Mouhat, Félix
name: Sorella, Sandro
name: Vuilleumier, Rodolphe
name: Saitta, Antonino M.
name: Casula, Michele
Publisher: name: arXiv
Year: 2017
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a novel approach for a fully quantum description of coupled electron-ion systems from first principles. It combines the variational quantum Monte Carlo (QMC) solution of the electronic part with the path integral (PI) formalism for the quantum nuclear dynamics. On the one hand, the PI molecular dynamics includes nuclear quantum effects by adding a set of fictitious classical particles (beads) aimed at reproducing nuclear quantum fluctuations via a harmonic kinetic term. On the other hand, variational QMC can provide Born-Oppenheimer (BO) potential energy surfaces with a precision comparable to the most advanced post Hartree-Fock approaches, and with a favorable scaling with the system size. To deal with the intrinsic QMC noise, we generalize the PI molecular dynamics using a Langevin thermostat correlated according to the covariance matrix of QMC nuclear forces. The variational parameters of the QMC wave function are evolved during the nuclear dynamics, such that the BO potential energy surface is unbiased. Statistical errors on the wave function parameters are reduced by resorting to bead grouping average, which we show to be accurate and well controlled. Our general algorithm relies on a Trotter breakup between the dynamics driven by ionic forces and the one set by the harmonic interbead couplings. The latter is exactly integrated even in presence of the Langevin thermostat, thanks to the mapping onto an Ornstein-Uhlenbeck process. This framework turns out to be very efficient also in the case of deterministic ionic forces. The new implementation is validated on the Zundel ion by direct comparison with standard PI Langevin dynamics calculations made with a coupled cluster potential energy surface. Nuclear quantum effects are confirmed to be dominant over thermal effects well beyond room temperature giving the excess proton an increased mobility by quantum tunneling.
description: 21 pages, 7 figures
The First Data Release of the Beijing-Arizona Sky Survey
Creators: name: Zou, Hu
name: Zhang, Tianmeng
name: Zhou, Zhimin
name: Nie, Jundan
name: Peng, Xiyan
name: Zhou, Xu
name: Jiang, Linhua
name: Cai, Zheng
name: Dey, Arjun
name: Fan, Xiaohui
name: Fan, Dongwei
name: Guo, Yucheng
name: He, Boliang
name: Jiang, Zhaoji
name: Lang, Dustin
name: Lesser, Michael
name: Li, Zefeng
name: Ma, Jun
name: Mao, Shude
name: McGreer, Ian
name: Schlegel, David
name: Shao, Yali
name: Wang, Jiali
name: Wang, Shu
name: Wu, Jin
name: Wu, Xiaohan
name: Yang, Qian
name: Yue, Minghao
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Beijing-Arizona Sky Survey (BASS) is a new wide-field legacy imaging survey in the northern Galactic cap using the 2.3m Bok telescope. The survey will cover about 5400 deg$^2$ in the $g$ and $r$ bands, and the expected 5$σ$ depths (corrected for the Galactic extinction) in the two bands are 24.0 and 23.4 mag, respectively. BASS started observations in January 2015, and has completed about 41% of the whole area as of July 2016. The first data release contains both calibrated images and photometric catalogs obtained in 2015 and 2016. The depths of single-epoch images in the two bands are 23.4 and 22.9 mag, and the full depths of three epochs are about 24.1 and 23.5 mag, respectively.
description: 16 pages, published by AJ
Holonomic Quantum Control by Coherent Optical Excitation in Diamond
Creators: name: Zhou, Brian B.
name: Jerger, Paul C.
name: Shkolnikov, V. O.
name: Heremans, F. Joseph
name: Burkard, Guido
name: Awschalom, David D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Although geometric phases in quantum evolution were historically overlooked, their active control now stimulates strategies for constructing robust quantum technologies. Here, we demonstrate arbitrary single-qubit holonomic gates from a single cycle of non-adiabatic evolution, eliminating the need to concatenate two separate cycles. Our method varies the amplitude, phase, and detuning of a two-tone optical field to control the non-Abelian geometric phase acquired by a nitrogen-vacancy center in diamond over a coherent excitation cycle. We demonstrate the enhanced robustness of detuned gates to excited-state decoherence and provide insights for optimizing fast holonomic control in dissipative quantum systems.
description: Minor revisions to main text (6 pages); added supplementary material (7 pages)
Yoneda structures and KZ doctrines
Creators: name: Walker, Charles
Publisher: name: arXiv
Year: 2017
Subjects: subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 18A35, 18C15, 18D05

description: In this paper we strengthen the relationship between Yoneda structures and KZ doctrines by showing that for any locally fully faithful KZ doctrine, with the notion of admissibility as defined by Bunge and Funk, all of the Yoneda structure axioms apart from the right ideal property are automatic.
description: 12 pages; final version; to appear in the Journal of Pure and Applied Algebra
Direction-Dependent Stability of skyrmion lattice in helimagnets induced by Exchange Anisotropy
Creators: name: Hu, Yangfan
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Exchange anisotropy provides a direction dependent mechanism for the stability of the skyrmion lattice phase in noncentrosymmetric bulk chiral magnets. Based on the Fourier representation of the skyrmion lattice, we explain the direction dependence of the temperature-magnetic field phase diagram for bulk MnSi through a phenomenological mean-field model incorporating exchange anisotropy. Through quantitative comparison with experimental results, we clarify that the stability of the skyrmion lattice phase in bulk MnSi is determined by a combined effect of negative exchange anisotropy and thermal fluctuation. The effect of exchange anisotropy and the order of Fourier representation on the equilibrium properties of the skyrmion lattice is discussed in detail.
description: 13 pages, 4 figures
Employment Status, Time Use Patterns, and Well-being: A Disaggregated Analysis
Creators: name: Dr.P.Shanmugam, Junaid Yasin Shah
Publisher: name: Zenodo
Year: 2025

description: This study examines the relationship between employment status, time allocation, and the wellbeing of women in rural Anantnag, Kashmir. By analyzing how employed and unemployed womendistribute their time. The research highlights the dual burden faced by employed women, who balancework and household responsibilities, and the increased time spent on household duties by unemployedwomen. Additionally, the study explores the psychological and physical well-being of women, findinghigher levels of stress and exhaustion among employed women and increased anxiety among theunemployed. Using statistical methods such as ANOVA, Kruskal-Wallis tests, and regression analysis, thestudy identifies key factors that influence time allocation. The study calls for comprehensive policyinterventions that address structural barriers and improve the economic and social mobility of women inrural Kashmir.
Hilbert-Poincare series for spaces of commuting elements in Lie groups
Creators: name: Ramras, Daniel A.
name: Stafa, Mentor
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Topology (math.AT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 22E99, 55N10 (Primary), 20F55, 57T10 (Secondary)

description: In this article we study the homology of spaces ${\rm Hom}(\mathbb{Z}^n,G)$ of ordered pairwise commuting $n$-tuples in a Lie group $G$. We give an explicit formula for the Poincare series of these spaces in terms of invariants of the Weyl group of $G$. By work of Bergeron and Silberman, our results also apply to ${\rm Hom}(F_n/Γ_n^m,G)$, where the subgroups $Γ_n^m$ are the terms in the descending central series of the free group $F_n$. Finally, we show that there is a stable equivalence between the space ${\rm Comm}(G)$ studied by Cohen-Stafa and its nilpotent analogues.
description: 20 pages, journal version
Analysis of leachable, extractable, and non-extractable PFAS in contaminated soils – how to measure "total PFAS"?
Creators: name: Lange, Frank Thomas
name: Löffler, Nadine
Publisher: name: Zenodo
Year: 2023
Subjects: PFAS, non-extractable residues, EOF, TOP assay, dTOP assay, 19F NMR

description: Different analytical methods for detection of extractable and so-called non-extractable PFAS residues in heavily contaminated soils are compared and most promising approaches for measuring "total PFAS" are identified.
МИЛЛИЙ ҚОНУНЧИЛИКДА МОЛ-МУЛКНИ МУСОДАРА ҚИЛИШГА БЎЛГАН МУНОСАБАТЛАР ТЕНДЕНЦИЯСИ
Creators: name: Полвонов, Нажмиддин
Publisher: name: Zenodo
Year: 2024

description: мазкур мақолада миллий қонунчиликда жиноятларни олдини олиш ва уларга қарши қарши курашда шахснинг мол-мулкни мусодара қилиш, унинг мулкий оқибатлари, мусодара қилишда қонунчилик нормаларини такомиллаштириш масалалари таҳлил этилди.
First simultaneous extraction of spin-dependent parton distributions and fragmentation functions from a global QCD analysis
Creators: name: Ethier, J. J.
name: Sato, N.
name: Melnitchouk, W.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We perform the first global QCD analysis of polarized inclusive and semi-inclusive deep-inelastic scattering and single-inclusive $e^+e^-$ annihilation data, fitting simultaneously the parton distribution and fragmentation functions using the iterative Monte Carlo method. Without imposing SU(3) symmetry relations, we find the strange polarization to be very small, consistent with zero for both inclusive and semi-inclusive data, which provides a resolution to the strange quark polarization puzzle. The combined analysis also allows the direct extraction from data of the isovector and octet axial charges, and is consistent with a small SU(2) flavor asymmetry of the polarized sea.
description: 5 pages, 4 figures
Universal non-analytic behavior of the non-equilibrium Hall conductance in Floquet topological insulators
Creators: name: Schmitt, Markus
name: Wang, Pei
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the Hall conductance in a Floquet topological insulator in the long time limit after sudden switches of the driving amplitude. Based on a high frequency expansion of the effective Hamiltonian and the micromotion operator we demonstrate that the Hall conductance as function of the driving amplitude follows universal non-analytic laws close to phase transitions that are related to conic gap closing points, namely a logarithmic divergence for gapped initial states and jumps of a definite height for gapless initial states. This constitutes a generalization of the results known for the static systems to the driven case.
description: 17 pages, 5 figures; added discussion of partially filled bands as initial states and effect of weak disorder
$t$-Unique Reductions for Mészáros's Subdivision Algebra
Creators: name: Grinberg, Darij
Publisher: name: arXiv
Year: 2017
Subjects: subject: Combinatorics (math.CO)
subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 05E15, 05E40

description: Fix a commutative ring $\mathbf{k}$, two elements $β,α\in\mathbf{k}$ and a positive integer $n$. Let $\mathcal{X}$ be the polynomial ring over $\mathbf{k}$ in the $n(n-1)/2$ indeterminates $x_{i,j}$ for all $1\leq i
description: Published version. See version 6 for the detailed and original versions
Quantitative measurement of antibiotic resistance in Mycobacterium tuberculosis reveals genetic determinants of resistance and susceptibility in a target gene approach.
Creators: name: Consortium, The CRyPTIC
Publisher: name: The Francis Crick Institute
Year: 2024
Subjects: classificationCode: Infectious Disease
subject: Infectious Disease
classificationCode: Immunology
subject: Immunology
subject: FOS: Clinical medicine
classificationCode: Human Biology & Physiology
subject: Human Biology & Physiology
classificationCode: Model organisms
subject: Model organisms

description: The World Health Organization has a goal of universal drug susceptibility testing for patients with tuberculosis. However, molecular diagnostics to date have focused largely on first-line drugs and predicting susceptibilities in a binary manner (classifying strains as either susceptible or resistant). Here, we used a multivariable linear mixed model alongside whole genome sequencing and a quantitative microtiter plate assay to relate genomic mutations to minimum inhibitory concentration (MIC) in 15,211 Mycobacterium tuberculosis clinical isolates from 23 countries across five continents. We identified 492 unique MIC-elevating variants across 13 drugs, as well as 91 mutations likely linked to hypersensitivity. Our results advance genetics-based diagnostics for tuberculosis and serve as a curated training/testing dataset for development of drug resistance prediction algorithms.
Equation of state and self-bound droplet in Rabi-coupled Bose mixtures
Creators: name: Cappellaro, Alberto
name: Macrì, Tommaso
name: Bertacco, Giovanni F.
name: Salasnich, Luca
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Laser induced transitions between internal states of atoms have been playing a fundamental role to manipulate atomic clouds for many decades. In absence of interactions each atom behaves independently and their coherent quantum dynamics is described by the Rabi model. Since the experimental observation of Bose condensation in dilute gases, static and dynamical properties of multicomponent quantum gases have been extensively investigated. Moreover, at very low temperatures quantum fluctuations crucially affect the equation of state of many-body systems. Here we study the effects of quantum fluctuations on a Rabi-coupled two-component Bose gas of interacting alkali atoms. The divergent zero-point energy of gapless and gapped elementary excitations of the uniform system is properly regularized obtaining a meaningful analytical expression for the beyond-mean-field equation of state. In the case of attractive inter-particle interaction we show that the quantum pressure arising from Gaussian fluctuations can prevent the collapse of the mixture with the creation of a self-bound droplet. We characterize the droplet phase and discover an energetic instability above a critical Rabi frequency provoking the evaporation of the droplet. Finally, we suggest an experiment to observe such quantum droplets using Rabi-coupled internal states of $^{39}$K atoms.
description: to be published in Scientific Reports
Symmetry-protected topological phase transition in one-dimensional Kondo lattice and its realization with ultracold atoms
Creators: name: Nakagawa, Masaya
name: Kawakami, Norio
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose that ultracold alkaline-earth-like atoms confined in one-dimensional optical lattice can realize a Kondo lattice model which hosts a symmetry-protected topological (SPT) phase and an associated quantum phase transition in a controllable manner. The symmetry protection of the phase transition is discussed from two different viewpoints: topological properties related to spatial patterns of Kondo singlets, and symmetry eigenvalues of the spin states. We uncover the role of various symmetries in the phase diagram of this system by combining a weak-coupling approach by Abelian bosonization and strong-coupling pictures of ground states. Furthermore, we show that the bosonization approach correctly describes a crossover from a fermionic SPT phase to a bosonic SPT phase and an associated change of protecting symmetries as the charge degrees of freedom are frozen by the Hubbard repulsion.
description: 14 pages, 3 figures
Oracles and query lower bounds in generalised probabilistic theories
Creators: name: Barnum, Howard
name: Lee, Ciarán M.
name: Selby, John H.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the connection between interference and computational power within the operationally defined framework of generalised probabilistic theories. To compare the computational abilities of different theories within this framework we show that any theory satisfying three natural physical principles possess a well-defined oracle model. Indeed, we prove a subroutine theorem for oracles in such theories which is a necessary condition for the oracle to be well-defined. The three principles are: causality (roughly, no signalling from the future), purification (each mixed state arises as the marginal of a pure state of a larger system), and strong symmetry existence of non-trivial reversible transformations). Sorkin has defined a hierarchy of conceivable interference behaviours, where the order in the hierarchy corresponds to the number of paths that have an irreducible interaction in a multi-slit experiment. Given our oracle model, we show that if a classical computer requires at least n queries to solve a learning problem, then the corresponding lower bound in theories lying at the kth level of Sorkin's hierarchy is n/k. Hence, lower bounds on the number of queries to a quantum oracle needed to solve certain problems are not optimal in the space of all generalised probabilistic theories, although it is not yet known whether the optimal bounds are achievable in general. Hence searches for higher-order interference are not only foundationally motivated, but constitute a search for a computational resource beyond that offered by quantum computation.
description: 17+7 pages. Comments Welcome. Published in special issue "Foundational Aspects of Quantum Information" in Foundations of Physics
The VLT-FLAMES Tarantula Survey XXIV. Stellar properties of the O-type giants and supergiants in 30 Doradus
Creators: name: Ramírez-Agudelo, O. H.
name: Sana, H.
name: de Koter, A.
name: Tramper, F.
name: Grin, N. J.
name: Schneider, F. R. N.
name: Langer, N.
name: Puls, J.
name: Markova, N.
name: Bestenlehner, J. M.
name: Castro, N.
name: Crowther, P. A.
name: Evans, C. J.
name: García, M.
name: Gräfener, G.
name: Herrero, A.
name: van Kempen, B.
name: Lennon, D. J.
name: Apellániz, J. Maíz
name: Najarro, F.
name: Sabín-Sanjulián, C.
name: Simón-Díaz, S.
name: Taylor, W. D.
name: Vink, J. S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The Tarantula region in the Large Magellanic Cloud contains the richest population of spatially resolved massive O-type stars known so far. This unmatched sample offers an opportunity to test models describing their main-sequence evolution and mass-loss properties. Using ground-based optical spectroscopy obtained in the framework of the VLT-FLAMES Tarantula Survey (VFTS), we aim to determine stellar, photospheric and wind properties of 72 presumably single O-type giants, bright giants and supergiants and to confront them with predictions of stellar evolution and of line-driven mass-loss theories. We apply an automated method for quantitative spectroscopic analysis of O stars combining the non-LTE stellar atmosphere model {\sc fastwind} with the genetic fitting algorithm {\sc pikaia} to determine the following stellar properties: effective temperature, surface gravity, mass-loss rate, helium abundance, and projected rotational velocity. We present empirical effective temperature versus spectral subtype calibrations at LMC-metallicity for giants and supergiants. In the spectroscopic and classical Hertzsprung-Russell diagrams, our sample O stars are found to occupy the region predicted to be the core hydrogen-burning phase by Brott et al. (2011) and Köhler et al. (2015). Except for five stars, the helium abundance of our sample stars is in agreement with the initial LMC composition. The aforementioned five stars present moderate projected rotational velocities (i.e., $v_{\mathrm{e}}\,\sin\,i\,
description: 39 pages, 12 figures in the main text, 12 figures in the appendix. Accepted for publication in A&A. Tables C1-C5 will be available at the CDS. Appendix E has been truncated due to size limitations, the full version will be available on A&A
Double Hall instability: A catalyzer of magnetic energy release
Creators: name: Kitchatinov, L. L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: A pictorial explanation for shear-Hall instability is suggested and shows that the shear flow is not necessary for the instability because its role can be played by the Hall effect of an inhomogeneous background magnetic field. Linear stability analysis for a simple model of magnetic field varying periodically in space confirms such a 'double Hall' instability. Numerical computations show a considerable increase in Ohmic dissipation rate at the nonlinear stage of instability development. Field dissipation has a spiky character associated with magnetic reconnection in current sheets and X-points. Double Hall instability can be significant for magnetic field dissipation in neutron star crusts and, possibly, in the solar corona.
description: 8 pages, 8 figures, to appear in Astronomy Letters
Effects of dust absorption on spectroscopic studies of turbulence
Creators: name: Kandel, D.
name: Lazarian, A.
name: Pogosyan, D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the effect of dust absorption on the recovery velocity and density spectra as well as on the anisotropies of magnetohydrodynamic turbulence using the Velocity Channel Analysis (VCA), Velocity Coordinate Spectrum (VCS) and Velocity Centroids. The dust limits volume up to an optical depth of unity. We show that in the case of the emissivity proportional to the density of emitters, the effects of random density get suppressed for strong dust absorption intensity variations arise from the velocity fluctuations only. However, for the emissivity proportional to squared density, both density and velocity fluctuations affect the observed intensities. We predict a new asymptotic regime for the spectrum of fluctuations for large scales exceeding the physical depths to unit optical depth. The spectrum gets shallower by unity in this regime. In addition, the dust absorption removes the degeneracy resulted in the universal $K^{-3}$ spectrum of intensity fluctuations of self-absorbing medium reported by Lazarian \& Pogosyan. We show that the predicted result is consistent with the available HII region emission data. We find that for sub-Alfvénic and trans-Alfvénic turbulence one can get the information about both the magnetic field direction and the fundamental Alfvén, fast and slow modes that constitute MHD turbulence.
description: Published in MNRAS, minor changes to match the published version
Response of Network Circuits Connected to Exponential Excitation Sources
Creators: name: Gupta, Rohit
Publisher: name: figshare
Year: 2023
Subjects: Circuits and systems
Electrical circuits and systems
Electrical energy transmission, networks and systems

description: In science and engineering, network circuit’s analysis is a principal course. In this paper, we discuss the application of Mohand Transform for obtaining the Response of electric network circuits with an exponential excitation Source which is generally determined by the application of calculus method or different integral Transforms or convolution method or Matrix method. The response of electric network circuits with an exponential excitation source provides an expression for the current or voltage. This paper presents demonstrated the use of the Mohand Transform for determining the response of electric network circuits with an exponential excitation source.
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ESiWACE3 - Milestone M1.4 - Applications developed by ESiWACE available to users of EuroHPC JU systems via automated deployment platform, including documentation for users, required software stack, automated testing and quality checks
Creators: name: Acosta, Mario
name: Castrillo, Miguel
name: Palomas, Sergi
Publisher: name: Zenodo
Year: 2023
Subjects: ESiWACE3
Milestone

description: Applications developed by ESiWACE available to users of EuroHPC JU systems
IARJSET.2020.7204.pdf
Creators: name: Gupta, Rohit
Publisher: name: figshare
Year: 2023
Subjects: Circuits and systems
Electrical circuits and systems
Electrical energy transmission, networks and systems

description: In science and engineering, network circuit’s analysis is a principal course. In this paper, we discuss the application of Mohand Transform for obtaining the Response of electric network circuits with an exponential excitation Source which is generally determined by the application of calculus method or different integral Transforms or convolution method or Matrix method. The response of electric network circuits with an exponential excitation source provides an expression for the current or voltage. This paper presents demonstrated the use of the Mohand Transform for determining the response of electric network circuits with an exponential excitation source.
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Valter Cantino nel ricordo del Presidente di SIDREA
Creators: name: Marasca, Stefano
Publisher: name: Department of Economics and Business Studies, University of Genoa
Year: 2023
Subjects: Accounting and Business Adm.

description: Stefano Marasca, Presidente della Società Italiana dei Docenti di Ragioneria ed Economia Aziendale – SIDREA, ricorda il “percorso parallelo” che lo ha accomunato a Valter Cantino: dalla Scuola di didattica di AIDEA alle progressive tappe della carriera, così come i tanti momenti di incontro e di confronto animati dalla sintonia nel modo di sentire e vivere l’impegno nell’Università.
Reversing cooling flows with AGN jets: shock waves, rarefaction waves, and trailing outflows
Creators: name: Guo, Fulai
name: Duan, Xiaodong
name: Yuan, Ye-Fei
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The cooling flow problem is one of the central problems in galaxy clusters, and active galactic nucleus (AGN) feedback is considered to play a key role in offsetting cooling. However, how AGN jets heat and suppress cooling flows remains highly debated. Using an idealized simulation of a cool-core cluster, we study the development of central cooling catastrophe and how a subsequent powerful AGN jet event averts cooling flows, with a focus on complex gasdynamical processes involved. We find that the jet drives a bow shock, which reverses cooling inflows and overheats inner cool core regions. The shocked gas moves outward in a rarefaction wave, which rarefies the dense core and adiabatically transports a significant fraction of heated energy to outer regions. As the rarefaction wave propagates away, inflows resume in the cluster core, but a trailing outflow is uplifted by the AGN bubble, preventing gas accumulation and catastrophic cooling in central regions. Inflows and trailing outflows constitute meridional circulations in the cluster core. At later times, trailing outflows fall back to the cluster centre, triggering central cooling catastrophe and potentially a new generation of AGN feedback. We thus envisage a picture of cool cluster cores going through cycles of cooling-induced contraction and AGN-induced expansion. This picture naturally predicts an anti-correlation between the gas fraction (or X-ray luminosity) of cool cores and the central gas entropy, which may be tested by X-ray observations.
description: Slightly revised version, accepted for publication in MNRAS. 14 pages, 10 figures
Valter Cantino nel ricordo di tre Colleghi torinesi
Creators: name: Puddu, Luigi
name: Campra, Maura
name: Bava, Fabrizio
Publisher: name: Department of Economics and Business Studies, University of Genoa
Year: 2023
Subjects: Accounting and Business Adm.

description: Luigi Puddu, Maura Campra e Fabrizio Bava hanno avuto modo di condividere, in diversi momenti e con diversi ruoli, il percorso di Valter Cantino: Luigi Puddu come referente che lo ha introdotto e accompagnato nella carriera, Maura Campra come collega che con lui ha a lungo studiato e lavorato, Fabrizio Bava che invece è stato il suo primo allievo. Ognuno di loro ne propone il ricordo e, ognuno dal proprio punto di vista, concorrono tutti a ricomporne il profilo umano e professionale.
Ultra-High-Energy Cosmic Rays from Radio Galaxies
Creators: name: Eichmann, Björn
name: Rachen, Jörg P.
name: Merten, Lukas
name: van Vliet, Arjen
name: Tjus, Julia Becker
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Radio galaxies are intensively discussed as the sources of cosmic rays observed above about $3\,{\times}\,10^{18}\,\text{eV}$, called ultra-high energy cosmic rays (UHECRs). We present a first, systematic approach that takes the individual characteristics of these sources into account, as well as the impact of the extragalactic magnetic-field structures up to a distance of 120 Mpc. We use a mixed simulation setup, based on 3D simulations of UHECRs ejected by observed, individual radio galaxies taken out to a distance of 120 Mpc, and on 1D simulations over a continuous source distribution contributing from beyond 120 Mpc. Additionally, we include the ultra-luminous radio galaxy Cygnus A at a distance of about $250\,$Mpc, as its contribution is so strong that it must be considered as an individual point source. The implementation of the UHECR ejection in our simulation setup is based on a detailed consideration of the physics of radio jets and standard first-order Fermi acceleration. We show that the average contribution of radio galaxies taken over a very large volume cannot explain the observed features of UHECRs measured at Earth. However, we obtain excellent agreement with the spectrum, composition, and arrival-direction distribution of UHECRs measured by the Pierre Auger Observatory, if we assume that most UHECRs observed arise from only two sources: The ultra-luminous radio galaxy Cygnus A, providing a mostly light composition of nuclear species dominating up to about $6\,{\times}\,10^{19}\,$eV, and the nearest radio galaxy Centaurus A, providing a heavy composition dominating above $6\,{\times}\,10^{19}\,$eV. Here we have to assume that extragalactic magnetic fields out to 250 Mpc, which we did not include in the simulation, are able to isotropize the UHECR events at about 8 EeV arriving from Cygnus A.
BranchConnect: Large-Scale Visual Recognition with Learned Branch Connections
Creators: name: Ahmed, Karim
name: Torresani, Lorenzo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We introduce an architecture for large-scale image categorization that enables the end-to-end learning of separate visual features for the different classes to distinguish. The proposed model consists of a deep CNN shaped like a tree. The stem of the tree includes a sequence of convolutional layers common to all classes. The stem then splits into multiple branches implementing parallel feature extractors, which are ultimately connected to the final classification layer via learned gated connections. These learned gates determine for each individual class the subset of features to use. Such a scheme naturally encourages the learning of a heterogeneous set of specialized features through the separate branches and it allows each class to use the subset of features that are optimal for its recognition. We show the generality of our proposed method by reshaping several popular CNNs from the literature into our proposed architecture. Our experiments on the CIFAR100, CIFAR10, and Synth datasets show that in each case our resulting model yields a substantial improvement in accuracy over the original CNN. Our empirical analysis also suggests that our scheme acts as a form of beneficial regularization improving generalization performance.
description: WACV 2018
SUBSTANTIATION THE DISC RIPPER PARAMETERS OF  THE PLOWING UNIT
Creators: name: Tukhtakuziev, A.
name: Nurmanov, S.S.
name: Ergashev, M.M.
name: Usarov, M.M.
Publisher: name: Zenodo
Year: 2024

description: The information about the unit and technological process of the developed combined plowable unit , consisting of disc ripper and plow and mounted appropriately in front and behind the tractor are specified in the article. The results of theoretical studies to substantiate the installation angles to direction of movement and vertical, diameter and radius of curvature of the working surface of discs of its disc ripper and transverse and longitudinal distances between them are mentioned as well.
Polarization Shift Keying (PolarSK): System Scheme and Performance Analysis
Creators: name: Zhang, Jiliang
name: Wang, Yang
name: Zhang, Jie
name: Ding, Liqin
Publisher: name: arXiv
Year: 2017
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Single-Radio-Frequency (RF) Multiple-Input-Multiple-Output (MIMO) systems such as the spatial modulation (SM) system and the space shift keying (SSK) system have been proposed to pursue a high spectral efficiency while keeping a low cost and complexity transceiver design. Currently, polarization domain resource has been introduced to the single-RF MIMO system to reduce the size of the transmit antenna array and provide 1 bit per channel use (bpcu) multiplexing gain. Nevertheless, the polarization domain resource still has the potential to provide a higher multiplexing gain in the polarized single-RF MIMO system. In this paper, we propose a generalized polarization shift keying (PolarSK) modulation scheme for a SIMO system that uses the polarization states in the dual-polarized transmit antenna as an information-bearing unit to increase the overall spectral efficiency. At the receive end, the maximum likelihood (ML) detector is employed to demodulate the received signal. A closed form union upper bound on the average bit error probability (ABEP) of PolarSK system with the optimum maximum likelihood (ML) receiver is deduced under fading channels. To reduce the computational complexity of the receiver, a linear successive interference cancellation (SIC) detection algorithm and a sphere-decoding (SD) detection algorithm are proposed. On the basis of analytic results and simulations, performances of the proposed PolarSK systems in terms of computational complexity and ABEP are analyzed. Numerical results show that the proposed PolarSK scheme performs better than state of the art dual-polarized/uni-polarized SM schemes.
description: Accepted to be published in IEEE Transactions on Vehicular Technology
$D$ - meson production at very forward rapidities: estimating the intrinsic charm contribution
Creators: name: Carvalho, F.
name: Giannini, A. V.
name: Goncalves, V. P.
name: Navarra, F. S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study $D$ - meson production at forward rapidities taking into account the non - linear effects in the QCD dynamics and the intrinsic charm component of the proton wave function. The total cross section, the rapidity distributions and the Feynman - $x$ distributions are calculated for $p p$ collisions at different center of mass energies. Our results show that, at the LHC, the intrinsic charm component changes the $D$ rapidity distributions in a region which is beyond the coverage of the LHCb detectors. At higher energies the IC component dominates the $y$ and $x_F$ distributions exactly in the range where the produced $D$ mesons decay and contribute the most to the prompt atmospheric neutrino flux measured by the ICECUBE Collaboration. We compute the $x_F$ - distributions and demonstrate that they are enhanced at LHC energies by approximately one order of magnitude in the $0.2 \le x_F \le 0.8$ range.
description: 11 pages, 8 figures. v2: new references added, minor changes in the text, changes in the figures; v3: new results with better treatment for the fragmentation function of partons into D0/D0bar mesons; conclusions unchanged; matches the version published in Phys. Rev. D
Cantino V. “L’economia delle imprese della ristorazione collettiva”, 1994
Creators: name: Biancone, Paolo Pietro
name: Secinaro, Silvana
Publisher: name: Department of Economics and Business Studies, University of Genoa
Year: 2023
Subjects: Accounting and Business Adm.

description: Paolo Biancone e Silvana Secinaro presentano la prima monografia di Valter Cantino, dedicata a ”L’economia delle imprese della ristorazione collettiva” e pubblicata nel 1994 dall’Editore Giuffrè. Vengono sottolineati alcuni aspetti di metodo e di contenuto destinati a trovare sviluppo nella produzione scientifica successiva. Alla presentazione fa seguito la riproduzione di alcuni brani del lavoro.
Sampling Theorems for Shift-invariant Spaces, Gabor Frames, and Totally Positive Functions
Creators: name: Gröchenig, Karlheinz
name: Romero, José Luis
name: Stöckler, Joachim
Publisher: name: arXiv
Year: 2016
Subjects: subject: Functional Analysis (math.FA)
subject: Information Theory (cs.IT)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 42C15, 42C40, 94A20

description: We study nonuniform sampling in shift-invariant spaces and the construction of Gabor frames with respect to the class of totally positive functions whose Fourier transform factors as $ \hat g(ξ)= \prod_{j=1}^n (1+2πiδ_jξ)^{-1} \, e^{-c ξ^2}$ for $δ_1,\ldots,δ_n\in \mathbb{R}, c >0$ (in which case $g$ is called totally positive of Gaussian type). In analogy to Beurling's sampling theorem for the Paley-Wiener space of entire functions, we prove that every separated set with lower Beurling density $>1$ is a sampling set for the shift-invariant space generated by such a $g$. In view of the known necessary density conditions, this result is optimal and validates the heuristic reasonings in the engineering literature. Using a subtle connection between sampling in shift-invariant spaces and the theory of Gabor frames, we show that the set of phase-space shifts of $g$ with respect to a rectangular lattice $α\mathbb{Z} \times β\mathbb{Z}$ forms a frame, if and only if $αβ<1$. This solves an open problem going back to Daubechies in 1990 for the class of totally positive functions of Gaussian type. The proof strategy involves the connection between sampling in shift-invariant spaces and Gabor frames, a new characterization of sampling sets "without inequalities" in the style of Beurling, new properties of totally positive functions, and the interplay between zero sets of functions in a shift-invariant space and functions in the Bargmann-Fock space.
description: 25 pages
Correlation femtoscopy study at NICA and STAR energies within a viscous hydrodynamic plus cascade model
Creators: name: Batyuk, P.
name: Karpenko, Iu.
name: Lednicky, R.
name: Malinina, L.
name: Mikhaylov, K.
name: Rogachevsky, O.
name: Wielanek, D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Correlation femtoscopy allows one to measure the space-time characteristics of particle production in relativistic heavy-ion collisions due to the effects of quantum statistics (QS) and final state interactions (FSI). The main features of the femtoscopy measurements at top RHIC and LHC energies are considered as a manifestation of strong collective flow and are well interpreted within hydrodynamic models employing equation of state (EoS) with a crossover type transition between Quark-Gluon Plasma (QGP) and hadron gas phases. The femtoscopy at lower energies was intensively studied at AGS and SPS accelerators and is being studied now in the Beam Energy Scan program (BES) at the BNL Relativistic Heavy Ion Collider in the context of exploration of the QCD phase diagram. In this article we present femtoscopic observables calculated for Au-Au collisions at $\sqrt{s_{NN}} = 7.7 - 62.4$ GeV in a viscous hydro + cascade model vHLLE+UrQMD and their dependence on the EoS of thermalized matter.
description: 11 pages, 8 figures
title: Als Eisforscher in Dome C – ein Tagebuch
Creators: name: Flückiger, Jacqueline
name: Bigler, Matthias
Publisher: name: :unas
Year: 2003

description: Seit 1997 sind Wissenschafter und Techniker aus zehn europäischen Ländern in Dome Concordia daran, den rund 3250 Meter mächtigen antarktischen Eisschild zu durchbohren. Die Untersuchungen an den Eisbohrkernen sollen die längste Klimarekonstruktion dieser Art ermöglichen. Insbesondere möchte man die Zusammenhänge im Klimasystem und die Ursachen von vergangenen natürlichen Klimaschwankungen besser verstehen – wesentliche Voraussetzungen, um Klimamodelle weiterentwickeln und immer genauere Klimaprognosen für die Zukunft erstellen zu können. Im Südsommer 2001/2002 haben erneut Berner Wissenschafter der Abteilung für Klima- und Umweltphysik an den Feldarbeiten in der Antarktis teilgenommen. Ein Tagebuch…