cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
ENSURE: A General Approach for Unsupervised Training of Deep Image Reconstruction Algorithms
Creators: name: Aggarwal, Hemant Kumar
name: Pramanik, Aniket
name: John, Maneesh
name: Jacob, Mathews
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Image reconstruction using deep learning algorithms offers improved reconstruction quality and lower reconstruction time than classical compressed sensing and model-based algorithms. Unfortunately, clean and fully sampled ground-truth data to train the deep networks is often unavailable in several applications, restricting the applicability of the above methods. We introduce a novel metric termed the ENsemble Stein's Unbiased Risk Estimate (ENSURE) framework, which can be used to train deep image reconstruction algorithms without fully sampled and noise-free images. The proposed framework is the generalization of the classical SURE and GSURE formulation to the setting where the images are sampled by different measurement operators, chosen randomly from a set. We evaluate the expectation of the GSURE loss functions over the sampling patterns to obtain the ENSURE loss function. We show that this loss is an unbiased estimate for the true mean-square error, which offers a better alternative to GSURE, which only offers an unbiased estimate for the projected error. Our experiments show that the networks trained with this loss function can offer reconstructions comparable to the supervised setting. While we demonstrate this framework in the context of MR image recovery, the ENSURE framework is generally applicable to arbitrary inverse problems.
Contrastive Learning-Based Audio to Lyrics Alignment for Multiple Languages
Creators: name: Durand, Simon
name: Stoller, Daniel
name: Ewert, Sebastian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Sound (cs.SD)
subject: Machine Learning (cs.LG)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Lyrics alignment gained considerable attention in recent years. State-of-the-art systems either re-use established speech recognition toolkits, or design end-to-end solutions involving a Connectionist Temporal Classification (CTC) loss. However, both approaches suffer from specific weaknesses: toolkits are known for their complexity, and CTC systems use a loss designed for transcription which can limit alignment accuracy. In this paper, we use instead a contrastive learning procedure that derives cross-modal embeddings linking the audio and text domains. This way, we obtain a novel system that is simple to train end-to-end, can make use of weakly annotated training data, jointly learns a powerful text model, and is tailored to alignment. The system is not only the first to yield an average absolute error below 0.2 seconds on the standard Jamendo dataset but it is also robust to other languages, even when trained on English data only. Finally, we release word-level alignments for the JamendoLyrics Multi-Lang dataset.
description: 5 pages, accepted at the International Conference on Acoustics, Speech, and Signal Processing (ICASSP) 2023
Formation of the Widest Binaries from Dynamical Unfolding of Triple Systems
Creators: name: Reipurth, Bo
name: Mikkola, Seppo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The formation of very wide binaries, such as the alpha Cen system with Proxima (also known as alpha Centauri C) separated from alpha Centauri (which itself is a close binary A/B) by 15000 AU, challenges current theories of star formation, because their separation can exceed the typical size of a collapsing cloud core. Various hypotheses have been proposed to overcome this problem, including the suggestion that ultra-wide binaries result from the dissolution of a star cluster - when a cluster star gravitationally captures another, distant, cluster star. Recent observations have shown that very wide binaries are frequently members of triple systems and that close binaries often have a distant third companion. Here we report Nbody simulations of the dynamical evolution of newborn triple systems still embedded in their nascent cloud cores that match observations of very wide systems. We find that although the triple systems are born very compact - and therefore initially are more protected against disruption by passing stars - they can develop extreme hierarchical architectures on timescales of millions of years as one component is dynamically scattered into a very distant orbit. The energy of ejection comes from shrinking the orbits of the other two stars, often making them look from a distance like a single star. Such loosely bound triple systems will therefore appear to be very wide binaries.
Free Energy of Coupled Oscillators: Lamb Shifts and van der Waals Interactions
Creators: name: Milonni, Peter W.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Helmholtz free energy of oscillators in thermal equilibrium with electromagnetic radiation is obtained from the Pauli-Hellmann-Feynman theorem and applied to some aspects of Lamb shifts and van der Waals interactions.
description: This article belongs to the special issue of Acta Physica Polonica A printed in honor of Professor Iwo Bialynicki-Birula on the occasion of his 90th birthday (Ed. Tomasz Sowinski, DOI:10.12693/APhysPolA.143.S0)
Testing the bootstrap constraints in the strange sector
Creators: name: Semenov-Tian-Shansky, K.
name: Vereshagin, V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper the bootstrap conditions that follow from the general postulates of effective scattering theory (EST) are checked in the strange sector. We construct the system of tree level bootstrap constraints for the renormalization prescriptions fixing the physical content of the theory. Then we perform the numerical testing of corresponding sum rules for the parameters of strange resonances. It is shown that, generally, the bootstrap constraints turn out consistent with presently known data on the strange resonance parameters. At the same time we point out few sum rules which cannot be saturated with modern data and discuss the possible reasons for such discrepancies.
description: 28 pages, 8 figures
Towards the renormalisation of the Standard Model effective field theory to dimension eight: Bosonic interactions I
Creators: name: Chala, Mikael
name: Guedes, Guilherme
name: Ramos, Maria
name: Santiago, Jose
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compute the one-loop renormalisation group running of the bosonic Standard Model effective operators to order $v^4/Λ^4$, with $v\sim 246$ GeV being the electroweak scale and $Λ$ the unknown new physics threshold. We concentrate on the effects triggered by pairs of the leading dimension-six interactions, namely those that can arise at tree level in weakly-coupled ultraviolet completions of the Standard Model. We highlight some interesting consequences, including the interplay between positivity bounds and the form of the anomalous dimensions; the non renormalisation of the $S$ and $U$ parameters; or the importance of radiative corrections to the Higgs potential for the electroweak phase transition. As a byproduct of this work, we provide a complete Green basis of operators involving only the Higgs and derivatives at dimension-eight, comprising 13 redundant interactions.
description: 30 pages, 1 figure, 5 tables. v3: Minor corrections. All RGEs obtained in the paper can be found in this repository: https://github.com/SMEFT-Dimension8-RGEs/. Only the notebook will be updated if further typos are found
Sprays metrizable by Finsler functions of constant flag curvature
Creators: name: Bucataru, Ioan
name: Muzsnay, Zoltán
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C60, 58B20, 49N45, 58E30

description: In this paper we characterize sprays that are metrizable by Finsler functions of constant flag curvature. By solving a particular case of the Finsler metrizability problem we provide the necessary and sufficient conditions that can be used to decide whether or not a given homogeneous system of second order ordinary differential equations represents the Euler-Lagrange equations of a Finsler function of constant flag curvature. The conditions we provide are tensorial equations on the Jacobi endomorphism. We identify the class of homogeneous SODE where the Finsler metrizability is equivalent with the metrizability by a Finsler function of constant flag curvature.
description: 14 pages
Embedded Online Optimization for Model Predictive Control at Megahertz Rates
Creators: name: Jerez, Juan L.
name: Goulart, Paul J.
name: Richter, Stefan
name: Constantinides, George A.
name: Kerrigan, Eric C.
name: Morari, Manfred
Publisher: name: arXiv
Year: 2013
Subjects: subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: Faster, cheaper, and more power efficient optimization solvers than those currently offered by general-purpose solutions are required for extending the use of model predictive control (MPC) to resource-constrained embedded platforms. We propose several custom computational architectures for different first-order optimization methods that can handle linear-quadratic MPC problems with input, input-rate, and soft state constraints. We provide analysis ensuring the reliable operation of the resulting controller under reduced precision fixed-point arithmetic. Implementation of the proposed architectures in FPGAs shows that satisfactory control performance at a sample rate beyond 1 MHz is achievable even on low-end devices, opening up new possibilities for the application of MPC on embedded systems.
Classicality of the Bogoliubov transformations and the dynamical Casimir effect through the reduced state of the field
Creators: name: Linowski, Tomasz
name: Rudnicki, Łukasz
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We use the reduced state of the field formalism [Entropy 21, 705 (2019)] to derive conditions under which a Bogoliubov transformation can be considered semi-classical. We apply this result to the dynamical Casimir effect in a moving medium [Phys. Rev. A 78, 042109 (2008)], discussing its classical and quantum features.
description: This article belongs to the special issue of Acta Physica Polonica A printed in honor of Professor Iwo Bialynicki-Birula on the occasion of his 90th birthday (Ed. Tomasz Sowinski, DOI:10.12693/APhysPolA.143.S0)
How 1950s ideas about creativity in machine learning continue to inform social and political possibility today
Creators: name: Mendon-Plasek, Aaron
Publisher: name: Columbia University
Year: 2021
Subjects: Machine learning
Creative ability
Artificial intelligence
Information technology--Social aspects
History

description: Adelle and Erwin Tomash Fellowship Lecture in the History of Information Technology, Charles Babbage Institute, University of Minnesota, 5 May 2021. In 1982 Newell observed retrospectively that by 1955 machine learning researchers had already splintered off from those who "became the AI community.” If early machine learning wasn’t artificial intelligence, what was it? This talk traces the historical problems of knowledge to which 1950s to 1970s "machine learning" was presented as a solution, and discusses why machine learning problem-framing strategies came to be seen by some as a compelling strategy for adjudicating social questions. Drawing on a study of thousands of published technical articles and original research in more than 12 archives, I illustrate how a collection of problem-framing strategies researchers denoted "machine learning" valorized a distinctive conception of creativity as the “production of completely new ideas not deducible from known data.” I show how efforts to instantiate this particular notion of creativity in digital computers was shaped by professional, social, and intellectual challenges of the researchers involved, and resulted in the creation of "learning machines" designed to (1) make human-like judgments given messy, unexpected, and even contradictory data, and that could (2) redefine “significance” for a given task apart from the programmer’s understanding of the task to be performed. Flipping the script of co-eval artificial intelligence research rooted in proof-proving and operations research, mid-century machine learning researchers argued that the lack of explicit definitions of relevant concepts or rules necessitated by learning directly from examples gave machine learning systems the capacity to respond to a greater range of contexts than those system builders could otherwise specify pragmatically. Emerging from the diffuse, transnational network of researchers attempting to implement creativity on digital computers in the 1950s and 1960s were two crises for individual researchers: (1) the practical inability to compare different learning machines that ostensibly did the same task, and (2) the existential inability to articulate what made machine learning qua pattern recognition a unique discipline. The solutions devised by machine learning researchers in the 1960s to address these two crises offered new modes of scientific identity for individual researchers and enlarged what constituted a legitimate description of the physical and social world. These descriptions of being and knowing continue to frame possibility in ongoing debates regarding the relationships between AI and society today.
Observational Study of Higher Dimensional Magnetic Universe in Non-linear Electrodynamics
Creators: name: Ranjit, Chayan
name: Chakraborty, Shuvendu
name: Debnath, Ujjal
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Physics (physics.gen-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work, we have considered the flat FRW model of the universe in $(n+2)$-dimensions filled with the dark matter and the magnetic field. We present the Hubble parameter in terms of the observable parameters $Ω_{m0}$ and $H_{0}$ with the redshift $z$ and the other parameters like $B_{0},ω, μ_{0},δ,n,w_{m}$. The natures of magnetic field $B$, deceleration parameter $q$ and $Om$ diagnostic have also been analyzed for accelerating expansion of the universe. From Stern data set (12 points), we have obtained the bounds of the arbitrary parameters by minimizing the $χ^{2}$ test. The best-fit values of the parameters are obtained by 66%, 90% and 99% confidence levels. Now to find the bounds of the parameters ($B_{0},ω$) and to draw the statistical confidence contour, we fixed four parameters $μ_{0},δ,n,w_{m}$. Here the parameter $n$ determines the higher dimensions and we perform comparative study between three cases : 4D $(n=2)$, 5D $(n=3)$ and 6D $(n=4)$ respectively. Next due to joint analysis with BAO observation, we have also obtained the bounds of the parameters ($B_{0},ω$) by fixing other parameters $μ_{0},δ,n,w_{m}$ for 4D, 5D and 6D. The best fit of distance modulus for our theoretical model and the Supernova Type Ia Union2 sample are drawn for different dimensions.
description: 23 pages, 9 figures. arXiv admin note: substantial text overlap with arXiv:1211.2785
title: Voruntersuchung Abladeoptimierung Mittelrhein : Gewässermorphologisches Systemverständnis als Grundlage für die Bewertung von Einwirkungen durch wasserbauliche Maßnahmen
Creators: name: B
Publisher: name: Bundesanstalt für Gewässerkunde, Koblenz
Year: 2019

description: BfG-Bericht 1985
Algebraic construction of associated functions of nondiagonalizable models with anharmonic oscillator complex interaction
Creators: name: Marquette, I.
name: Quesne, C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: A shape invariant nonseparable and nondiagonalizable two-dimensional model with anharmonic complex interaction, first studied by Cannata, Ioffe, and Nishnianidze, is re-examined with the purpose of providing an algebraic construction of the associated functions to the excited-state wavefunctions, needed to complete the basis. The two operators $A^+$ and $A^-$, coming from the shape invariant supersymmetric approach, where $A^+$ acts as a raising operator while $A^-$ annihilates all wavefunctions, are completed by introducing a novel pair of operators $B^+$ and $B^-$, where $B^-$ acts as the missing lowering operator. It is then shown that building the associated functions as polynomials in $A^+$ and $B^+$ acting on the ground state provides a much more efficient approach than that used in the original paper. In particular, we have been able to extend the previous results obtained for the first two excited states of the quartic anharmonic oscillator either by considering the next three excited states or by adding a cubic or a sextic term to the Hamiltonian.
description: 19 pages, no figure, published version
$gl_{n+1}$ algebra of Matrix Differential Operators and Matrix Quasi-exactly-solvable Problems
Creators: name: Smirnov, Yu. F.
name: Turbiner, A. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The generators of the algebra $gl_{n+1}$ in a form of differential operators of the first order acting on ${\bf R}^n$ with matrix coefficients are explicitly written. The algebraic Hamiltonians for a matrix generalization of $3-$body Calogero and Sutherland models are presented.
description: 22 pages, 2 figures, Dedicated to Miloslav Havlicek on the occasion of his 75th birthday
An Elementary Proof That Everett's Quantum Multiverse Is Nonlocal: Bell-Locality and Branch-Symmetry in the Many-Worlds Interpretation
Creators: name: Drezet, Aurélien
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: Everett's many-worlds or multiverse theory is an attempt to find an alternative to the standard Copenhagen interpretation of quantum mechanics. Everett's theory is often claimed to be local in the Bell sense. Here, we show that this is not the case and debunk the contradictions by analyzing in detail the Greenberger--Horne--Zeilinger (GHZ) nonlocality theorem. We discuss and compare different notions of locality often mixed in the Everettian literature and try to explain the nature of the confusion. We conclude with a discussion of probability and statistics in the many-worlds theory and stress that the strong symmetry existing between branches in the theory prohibits the definition of probability and that the theory cannot recover statistics. The only way out from this contradiction is to modify the theory by adding hidden variables à la Bohm and, as a consequence, the new theory is explicitly Bell-nonlocal.
A fast direct solver for quasi-periodic scattering problems
Creators: name: Gillman, Adrianna
name: Barnett, Alex
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Numerical Analysis (math.NA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider the numerical solution of the scattering of time-harmonic plane waves from an infinite periodic array of reflection or transmission obstacles in a homogeneous background medium, in two dimensions. Boundary integral formulations are ideal since they reduce the problem to $N$ unknowns on the obstacle boundary. However, for complex geometries and/or higher frequencies the resulting dense linear system becomes large, ruling out dense direct methods, and often ill-conditioned (despite being 2nd-kind), rendering fast multipole-based iterative schemes also inefficient. We present an integral equation based solver with O(N) complexity, which handles such ill-conditioning, using recent advances in "fast" direct linear algebra to invert hierarchically the isolated obstacle matrix. This is combined with a recent periodizing scheme that is robust for all incident angles, including Wood's anomalies, based upon the free space Green's function kernel. The resulting solver is extremely efficient when multiple incident angles are needed, as occurs in many applications. Our numerical tests include a complicated obstacle several wavelengths in size, with $N=10^5$ and solution error of $10^{-10}$, where the solver is 66 times faster per incident angle than a fast multipole based iterative solution, and 600 times faster when incident angles are chosen to share Bloch phases.
Long-term spectropolarimetric monitoring of the cool supergiant Betelgeuse
Creators: name: Bedecarrax, I.
name: Petit, P.
name: Aurière, M.
name: Grunhut, J.
name: Wade, G.
name: Chiavassa, A.
name: Donati, J. -F.
name: Konstantinova-Antova, R.
name: Perrin, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report on a long-term monitoring of the cool supergiant Betelgeuse, using the NARVAL and ESPaDOnS high-resolution spectropolarimeters, respectively installed at Telescope Bernard Lyot (Pic du Midi Observatory, France) and at the Canada-France-Hawaii Telescope (Mauna Kea Observatory, Hawaii). The data set, constituted of circularly polarized (Stokes V) and intensity (Stokes I) spectra, was collected between 2010 and 2012. We investigate here the temporal evolution of magnetic field, convection and temperature at photospheric level, using simultaneous measurements of the longitudinal magnetic field component, the core emission of the Ca II infrared triplet, the line-depth ratio of selected photospheric lines and the radial velocity of the star.
description: Proceedings of the Betelgeuse Workshop, Paris, 26-29 Nov 2012
Helicity Dependent Directional Surface Plasmon Polariton Excitation Using A Metasurface with Interfacial Phase Discontinuity
Creators: name: Huang, Lingling
name: Chen, Xianzhong
name: Bai, Benfeng
name: Tan, Qiaofeng
name: Jin, Guofan
name: Zentgraf, Thomas
name: Zhang, Shuang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Surface plasmon polaritons (SPPs) have been widely exploited in various scientific communities, ranging from physics, chemistry to biology, due to the strong confinement of light to the metal surface. For many applications it is important that the free space photon can be coupled to SPPs in a controllable manner. In this Letter, we apply the concept of interfacial phase discontinuity for circularly polarizations on a metasurface to the design of a novel type of polarization dependent SPP unidirectional excitation at normal incidence. Selective unidirectional excitation of SPPs along opposite directions is experimentally demonstrated at optical frequencies by simply switching the helicity of the incident light. This approach, in conjunction with dynamic polarization modulation techniques, opens gateway towards integrated plasmonic circuits with electrically reconfigurable functionalities.
description: 17 pages, 5 figures. Published on
Matrices of finite abelian groups, Finite Fourier Transform and codes
Creators: name: Shigeru, Kanemitsu
name: Michel, Waldschmidt
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 20C05

description: Finite (or Discrete) Fourier Transforms (FFT) are essential tools in engineering disciplines based on signal transmission, which is the case in most of them. FFT are related with circulant matrices, which can be viewed as group matrices of cyclic groups. In this regard, we introduce a generalization of the previous investigations to the case of finite groups, abelian or not. We make clear the points which were not recognized as underlying algebraic structures. Especially, all that appears in the FFT in engineering has been elucidated from the point of view of linear representations of finite groups. We include many worked-out examples for the readers in engineering disciplines.
description: 16 pages
Non-equilibrium and proximity effects in superconductor-normal metal junctions
Creators: name: Kauppila, V. J.
name: Nguyen, H. Q.
name: Heikkilä, T. T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the consequences of non-equilibrium heating and inverse proximity effect in normal metal - insulator - superconductor - insulator - normal metal (NISIN) junctions with a simple quasi-one-dimensional model. We especially focus on observables and parameter regions that are of interest in the design of SINIS coolers with quasiparticle traps. We present numerical results calculated by solving the Usadel equation and also present analytical approximations in two limiting cases: a short junction with a non-negligible resistance in both ends and a long junction with a transparent contact at one end.
description: 7 pages, 6 figures
Discovery of multi-target mur enzymes inhibitors with anti-mycobacterial activity through a Scaffold approach
Creators: name: Kumari, Madhulata
name: Waseem, Mohd
name: Subbarao, Naidu
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: In the present study, we generated a ligand-based scaffold model from a known bioactive datasets of mur enzymes of other species to identify multi-targeting inhibitors as antitubercular agents. Compounds in the ChEMBL database were first filtered to screen for substructure molecules ofMtb’s multi-target enzymes. 5′-O-(5-Amino-5-deoxy-β-D-ribofuranosyl)uridine has been identified as scaffold to develop compounds targeting Mtb’s mur enzymes. A library of Murcko scaffolds was extracted and evaluated for their in-silico antitubercular activity against Mtb’s mur enzymes. The screened compounds were subjected to molecular docking, molecular dynamics simulations, MM/PBSA calculation with Mtb’s mur enzymes to evaluate the mechanism of interaction to assess inhibitory activity against the target protein. The results revealed that 15 compounds have higher docking scores and good interactions with multiple mur enzymes of Mtb. From the docking analysis, compound HPT had the best score and binding affinity with the all mur enzymes. Further, protein-ligand interactions were evaluated by molecular dynamics simulations to assess their stability throughout 100 ns period. From the MD trajectory, we calculated RMSD, RMSF, Rg, PCA, DCCM, FEL, hydrogen bonding, and vector motion. Furthermore, the binding free energies of the all nine mur enzymes with compound HPT exhibited good binding affinity might show the anti-mycobacterial activity. The compound HPT revealed from this computational study could act as potent anti-mycobacterial inhibitors and further serve as lead scaffolds to develop more potent pharmaceutical molecules targeting multiple mur enzymes of Mtb based on 5′-O-(5-Amino-5-deoxy-β-D-ribofuranosyl)uridine in the future. Communicated by Ramaswamy H. Sarma
Robot control for simultaneous impact tasks via Quadratic Programming-based reference spreading
Creators: name: van Steen, Jari J.
name: van de Wouw, Nathan
name: Saccon, Alessandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: With the aim of further enabling the exploitation of impacts in robotic manipulation, a control framework is presented that directly tackles the challenges posed by tracking control of robotic manipulators that are tasked to perform nominally simultaneous impacts associated to multiple contact points. To this end, we extend the framework of reference spreading, which uses an extended ante- and post-impact reference coherent with a rigid impact map, determined under the assumption of an inelastic simultaneous impact. In practice, the robot will not reside exactly on the reference at the impact moment; as a result a sequence of impacts at the different contact points will typically occur. Our new approach extends reference spreading in this context via the introduction of an additional interim control mode. In this mode, a torque command is still based on the ante-impact reference with the goal of reaching the target contact state, but velocity feedback is disabled as this can be potentially harmful due to rapid velocity changes. With an eye towards real implementation, the approach is formulated using a quadratic programming (QP) control framework and is validated using numerical simulations both on a rigid robot model and on a realistic robot model with flexible joints.
description: 8 pages, 6 figures, accepted for the IEEE for the American Control Conference (ACC) 2022
Conservation of geometric structures for non-homogeneous inviscid incompressible fluids
Creators: name: Fanelli, Francesco
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We obtain a result about propagation of geometric properties for solutions of the non-homogeneous incompressible Euler system in any dimension $N\geq2$. In particular, we investigate conservation of striated and conormal regularity, which is a natural way of generalizing the 2-D structure of vortex patches. The results we get are only local in time, even in the dimension N=2; however, we provide an explicit lower bound for the lifespan of the solution. In the case of physical dimension N=2 or 3, we investigate also propagation of Hölder regularity in the interior of a bounded domain.
Magnetized black holes: interplay between charge and rotation
Creators: name: Karas, Vladimir
name: Stuchlik, Zdenek
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Already in the cornerstone works on astrophysical black holes published as early as in 1970s, Ruffini and collaborators have revealed potential importance of an intricate interaction between the effects of strong gravitational and electromagnetic fields. Close to the event horizon of the black hole, magnetic and electric lines of force become distorted and dragged even a in purely electro-vacuum system. Moreover, as the plasma effects inevitably arise in any astrophysically realistic environment, particles of different electric charge can separate from each other, become accelerated away from the black hole or accreted onto it, and contribute to the net electric charge of the black hole. From the point of principle, the case of super-strong magnetic fields is of particular interest, as the electromagnetic field can act as a source of gravity and influence the space-time geometry. In a brief celebratory note we revisit aspects of rotation and charge within the framework of exact (asymptotically non-flat) solutions of mutually coupled Einstein-Maxwell equations that describe magnetized, rotating black holes.
description: 10 pages, 1 figure, "Remo Ruffini Festschrift", Conference held in the ICRANet seat at Villa Ratti, Nice (France), and online 16-18 May 2022
The origins of $k^{-2}$ spectrum in the decaying Taylor-Green magnetohydrodynamic turbulent flows
Creators: name: Dallas, Vassilios
name: Alexakis, Alexandros
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We investigate the origins of $k^{-2}$ spectrum in a decaying Taylor-Green magnetohydrodynamic flow with zero large scale magnetic flux that was reported in Lee et al. (2010). A possible candidate for this scaling exponent has been the weak turbulence phenomenology. From our numerical simulations, we observe that current sheets in the magnetic Taylor-Green flow are formed in regions of magnetic discontinuities. Based on this observation and by studying the influence of the current sheets on the energy spectrum, using a filtering technique, we argue that the discontinuities are responsible for the $-2$ power law scaling of the energy spectra of this flow.
description: 8 pages, 6 figures
Hilbert genus fields of some number fields with high degrees
Creators: name: Chems-Eddin, Mohamed Mahmoud
name: Hajjami, Moulay Ahmed
name: Taous, Mohammed
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: The aim of this paper is to give some properties of Hilbert genus fields and construct the Hilbert genus fields of the fields $L_{m,d}:=\mathbb{Q}(ζ_{2^m},\sqrt{d})$, where $m\geq 3$ is a positive integer and $d$ is a square-free integer whose prime divisors are congruent to $\pm 3\pmod 8$ or $9\pmod{16}$.
description: 11 pages, published in Acta Mathematica Vietnamica (2022)
Single-walled silicon nanotube as an exceptional candidate to eliminate SARS-CoV-2: a theoretical study
Creators: name: Mendonça, Pedro Simão Sousa
name: dos Santos, Jeziel Rodrigues
name: de Oliveira, Osmair Vital
name: dos Santos, José Divino
name: Longo, Elson
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Molecular Biology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences

description: In this work, computational chemistry methods were used to study a silicon nanotube (Si192H16) as possible virucidal activity against SARS-CoV-2. This virus is responsible for the COVID-19 disease. DFT calculations showed that the structural parameters of the Si192H16 nanotube are in agreement with the theoretical/experimental parameters reported in the literature. The low energy gap value (0.29 eV) shows that this nanotube is a semiconductor and exhibits high reactivity. For nanomaterials to be used as virucides, they need to have high reactivity and high inhibition constant values. Therefore, the adsorption of 3O2 and H2O on the surface of Si192H16 (Si192H16@O2-H2O) was performed. In this process, the formation and activation energies were −51.63 and 16.62 kcal/mol, respectively. Molecular docking calculations showed that the Si192H16 and Si192H16@O2H-OH nanotubes bind favorably on the receptor-binding domain of the SARS-CoV-2 spike protein with binding energy of −11.83 (Ki = 2.13 nM) and −11.13 (Ki = 6.99 nM) kcal/mol, respectively. Overall, the results obtained herein indicate that the Si192H16 nanotube is a potential candidate to be used against COVID-19 from reactivity process and/or steric impediment in the S-protein. Communicated by Ramaswamy H. Sarma
Non-relativistic quantum theory at finite temperature
Creators: name: Wu, Xiang-Yao
name: Zhang, Bo-Jun
name: Liu, Xiao-Jing
name: Zhang, Si-Qi
name: Wang, Jing
name: Li, Hong
name: Ba, Nou
name: Xiao, Li
name: Wu, Yi-Heng
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose the non-relativistic finite temperature quantum wave equations for a single particle and multiple particles. We give the relation between energy eigenvalues, eigenfunctions, transition frequency and temperature, and obtain some results: (1) when the degeneracies of two energy levels are same, the transition frequency between the two energy levels is unchanged when the temperature is changed. (2) When the degeneracies of two energy levels are different, the variance of transition frequency at two energy levels is direct proportion to temperature difference.
description: arXiv admin note: text overlap with arXiv:hep-th/0506258 by other authors without attribution
Cosmological constraints on the Multi Scalar Field Dark Matter model
Creators: name: Téllez-Tovar, L. O.
name: Matos, Tonatiuh
name: Vázquez, J. Alberto
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The main aim of this paper is to provide cosmological constraints on the Multi Scalar Field Dark Matter model (MSFDM), in which we assume the dark matter is made up of different ultra-light scalar fields. As a first approximation, we consider they are real and do not interact with each other. We study the equations for both the background and perturbations for $N$-fields and present the evolution of the density parameters, the mass power spectrum and the CMB spectrum. In particular, we focus on two scalar fields with several combinations for the potentials $V(ϕ) = 1/2 m_ϕ^2 ϕ^2$, $V(ϕ) = m_ϕ^2f^2\left[1+\cos(ϕ/f)\right]$ and $V(ϕ) = m_ϕ^2f^2\left[\cosh(ϕ/f)-1\right]$, however the work, along with the code, could be easily extended to more fields. We use the data from BAO, Big Bang Nucleosynthesis, Lyman-$α$ forest and Supernovae to find constraints on the sampling parameters for the cases of a single field and double field, along with the Bayesian evidence. We found that some combinations of the potentials get penalized through the evidence, however for others there is a preference as good as for the cold dark matter.
description: 22 pages, 21 Figures; matches the version published in Physical Review D
States, Modes, Fields, and Photons in Quantum Optics
Creators: name: Raymer, Michael G.
name: Polakos, Paul
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantum nature of light enables potentially revolutionary communication technologies. Key to advancing this area of research is a clear understanding of the concepts of states, modes, fields, and photons. The concept of field modes carries over from classical optics, while the concept of state has to be considered carefully when treating light quantum mechanically. The term 'photon' is an overloaded identifier in the sense that it is often used to refer to either a quantum particle or the state of a field. This overloading, often used without placing in context, has the potential to obfuscate the physical processes that describe the reality we measure. We review the uses and relationships between these concepts using modern quantum optics theory, including the concept of a photon wave function, the modern history of which was moved forward in a groundbreaking paper in this journal by Iwo Białynicki-Birula, to whom this article is dedicated.
description: This article belongs to the special issue of Acta Physica Polonica A printed in honor of Professor Iwo Bialynicki-Birula on the occasion of his 90th birthday (Ed. Tomasz Sowinski, DOI:10.12693/APhysPolA.143.S0)
Non-LTE Luminosity and Abundance Diagnostics of Classical Novae in X-rays
Creators: name: Németh, Péter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Classical novae are significant sources of interstellar material, especially carbon, nitrogen and oxygen. These standard candles are only behind supernovae and $γ$-ray bursts as the third brightest objects in the sky, and the most probable progenitors of type Ia supernovae. After a nova outburst the system enters into the constant bolometric luminosity phase and the nova maintains a stable hydrogen burning in the surface layers of the white dwarf. As the expanding shell around the nova attenuates, progressively deeper and hotter layers become visible. At the end of the constant bolometric luminosity phase, the hottest layers are exposed and novae radiate X-rays. This work uses the static, plane-parallel model atmosphere code TLUSTY to calculate atmospheric structure and SYNSPEC to calculate synthetic X-ray spectra. It was necessary to incorporate atomic data for the highest ionization stages of elements ranging from hydrogen to iron in both programs. Atomic data on energy levels, bound-free, bound-bound transitions and natural broadening were taken from NIST and TOPbase. Extensive tests revealed the importance of line opacities on atmospheric parameters and on the final spectra. A correlation can be defined between effective temperature and surface gravity. The spectral appearance is not very sensitive to the joint changes of both. Due to this effect both parameters might be over-estimated with static models. These tests also showed that N VI and N VII lines are good indicators of the effective temperature. Model fitting of V4743 Sgr and V2491 Cyg confirmed the anticipated impact of modeling geometry and stellar wind. The ionization balance and line profiles indicate that both novae are close to or over the Eddington limit. These results are consistent with previous studies; further and unambiguous details require a comprehensive update of TLUSTY, what is under way.
description: Ph.D. dissertation, Florida Institute of Technology - 2010. 188 pages, 69 figures. Defense version. The official dissertation has been published by ProQuest/UMI. (Publication No. AAT 3407244, 2010; ISBN 9781109758917)
Fock State Sampling Method -- Characteristic temperature of maximal fluctuations for interacting bosons in box potentials
Creators: name: Kruk, M. B.
name: Vibel, T.
name: Arlt, J.
name: Kulik, P.
name: Pawłowski, K.
name: Rzążewski, K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the statistical properties of a gas of interacting bosons trapped in a box potential in two and three dimensions. Our primary focus is the characteristic temperature $\tchar$, i.e. the temperature at which the fluctuations of the number of condensed atoms (or, in 2D, the number of motionless atoms) is maximal. Using the Fock State Sampling method, we show that $\tchar$ increases due to interaction. In 3D, this temperature converges to the critical temperature in the thermodynamic limit. In 2D we show the general applicability of the method by obtaining a generalized dependence of the characteristic temperature on the interaction strength. Finally, we discuss the experimental conditions necessary for the verification of our theoretical predictions.
description: This article belongs to the special issue of Acta Physica Polonica A printed in honor of Professor Iwo Bialynicki-Birula on the occasion of his 90th birthday (Ed. Tomasz Sowinski, DOI:10.12693/APhysPolA.143.S0)
An Efficiency-Based Power Management Strategy for an Isolated Microgrid Project
Creators: name: Conte, Francesco
name: D'Agostino, Fabio
name: Grillo, Samuele
name: Mosaico, Gabriele
name: Silvestro, Federico
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The microgrids design for remote locations represents one of the most important and critical applications of the microgrid concept. It requires the correct sizing and the proper utilization of the different sources to guarantee the economical feasibility and the reliability of the supply. This study illustrates an efficiency-based power management strategy, designed for an undergoing microgrid project, where the sizing process of the resources (diesel generators, battery energy storage system, and PV plant) is obtained using a mixed-integer optimization algorithm. The proposed power management strategy guarantees the efficient exploitation of the power sources, which is one of the key elements of the optimal sizing process, being naturally included in the definition of the energy cost functions. The effectiveness of the power control strategy is validated by means of quasi-dynamic simulations on the complete microgrid model, where sources are defined by the optimal problem solution, while the cabling (size and length) and the main switchboards location reflect the expected system layout. Results obtained from the simulation of the microgrid electrical system include losses, and allow to verify and to highlight the desired quantities, such as the quality of supply at each busbar (voltage magnitude), and the state of charge of the energy storage system.
description: 2022 IEEE Power & Energy Society General Meeting (PESGM)
Testing lepton flavor universality in terms of data of BES III and charm-tau factory
Creators: name: Wang, Bin
name: Zhao, Ming-Gang
name: Sun, Ke-Sheng
name: Li, Xue-Qian
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The recent measurements on $R_K$ and $R_π$ imply that there exists a possible violation of the leptonic flavor universality which is one of the cornerstones of the standard model. It is suggested that a mixing between sterile and active neutrinos might induce such a violation. In this work we consider the scenarios with one or two sterile neutrinos to explicitly realize the data while the constraints from the available experiments have been taken into account. Moreover, as indicated in literature, the deviation of the real PMNS matrix from the symmetric patterns may be due to a $μ-τ$ asymmetry, therefore the measurements on $R_{D(D_s)eμ} = Γ(D(D_s)\rightarrow e^+ν_e)/Γ(D(D_s)\rightarrow μ^+ν_μ)$ and $R_{D(D_s)μτ} = Γ(D(D_s)\rightarrow μ^+ν_μ)/Γ(D(D_s)\rightarrow μ^+τ_τ)$ (and for some other heavy mesons $B^{\pm}$ and $B_c$ etc.) may shed more light on physics responsible for the violation of the leptonic flavor universality. The data of BES III are available to test the universality and that of the future charm-tau factory will provide more accurate information towards the aspect, in this work, we will discuss $R_{D(D_s)eμ}$ and $R_{D(D_s)μτ}$ in all details and also briefly consider the cases for $B^{\pm}$ and $B_c$.
description: 24 pages, 9 figures, 3 tables