cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the gamma-vector of symmetric edge polytopes
Creators: name: D'Alì, Alessio
name: Juhnke-Kubitzke, Martina
name: Köhne, Daniel
name: Venturello, Lorenzo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 52B20 (Primary) 05C80, 52B05, 52B12, 05E45 (Secondary)

description: We study $γ$-vectors associated with $h^*$-vectors of symmetric edge polytopes both from a deterministic and a probabilistic point of view. On the deterministic side, we prove nonnegativity of $γ_2$ for any graph and completely characterize the case when $γ_2 = 0$. The latter also confirms a conjecture by Lutz and Nevo in the realm of symmetric edge polytopes. On the probabilistic side, we show that the $γ$-vectors of symmetric edge polytopes of most Erdős-Rényi random graphs are asymptotically almost surely nonnegative up to any fixed entry. This proves that Gal's conjecture holds asymptotically almost surely for arbitrary unimodular triangulations in this setting.
description: v2: 30 pages, 4 figures. To appear on SIAM Journal on Discrete Mathematics
On the sensitivity of the energy of vanishing flow towards mass asymmetry of colliding nuclei
Creators: name: Goyal, Supriya
name: Puri, Rajeev K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We demonstrate the role of the mass asymmetry in the energy of vanishing flow by studying asymmetric reactions throughout the periodic table and over entire colliding geometry. Our results, which are almost independent of the system size and as well as of the colliding geometries indicate a sizable effect of the asymmetry of the reaction on the energy of vanishing flow.
Two Implementations of Pre-class Readings in Calculus Courses
Creators: name: Turkey, Houssein El
name: Turki, Salam
name: Yasanthi Kottegoda
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Space Science
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy

description: Many active learning practices highly depend on students' advance preparation for the class. However, reading Calculus can be a challenging task to students. We address this concern by assigning targeted pre-class readings in multiple Calculus courses. We report on our implementations, provide students' feedback, and discuss the lessons learned from these implementations.
New results on some Erdős-Ko-Rado-type problems
Creators: name: Currier, Gabriel
Publisher: name: University of British Columbia
Year: 2021

description: In this thesis, we study two longstanding problems in extremal set theory related to the Erdős-Ko-Rado theorem. In these problems, we have a collection F of k-subsets of an n-set that contains no copy of some forbidden substructure. The forbidden substructures in question here are known as clusters and simplices and are defined according to intersection and union constraints. The cluster conjecture that we consider was made by Mubayi in 2006 and the simplex conjecture was made in 1974 by Chvátal. We resolve completely the first of these two conjectures, and resolve the second for all but very small values of n.
The Delay of Population III Star Formation by Supersonic Streaming Velocities
Creators: name: Greif, Thomas
name: White, Simon
name: Klessen, Ralf
name: Springel, Volker
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: It has recently been demonstrated that coherent relative streaming velocities of order 30 km / s between dark matter and gas permeated the universe on scales below a few Mpc directly after recombination. We here use a series of high-resolution moving-mesh calculations to show that these supersonic motions significantly influence the virialization of the gas in minihalos, and delay the formation of the first stars. As the gas streams into minihalos with bulk velocities around 1 km / s at z ~ 20, the additional momentum and energy input reduces the gas fractions and central densities of the halos, increasing the typical virial mass required for efficient cooling by a factor of three, and delaying Population III star formation by dz ~ 4. Since the distribution of the magnitude of the streaming velocities is narrowly peaked around a non-negligible value, this effect is important in most regions of the universe. As a consequence, the increased minimum halo mass implies a reduction of the absolute number of minihalos that can be expected to cool and form Population III stars by up to an order of magnitude. We further find that the streaming velocities increase the turbulent velocity dispersion of the minihalo gas, which could affect its ability to fragment and hence alter the mass function of the first stars.
description: 6 pages, 5 figures, accepted for publication in ApJ
Challenges in Analyzing Imbalanced Groups Using Secondary Data: A Comparative Study of Balancing Techniques
Creators: name: KOUMANTAKIS, EMANUELE
Publisher: name: Zenodo
Year: 2025

description: Presented at the Conference on Data Sharing and Secondary Analysis in Child and Youth Wellbeing Research, organised within the COORDINATE project, held in Zagreb from 9th to 10th December 2024. The main objective of the conference was to showcase existing efforts in secondary data analysis for research and policy development, and to discuss the benefits and challenges of data-sharing practices in the field of child and youth wellbeing.
Approximate Bayesian Computation Based on Maxima Weighted Isolation Kernel Mapping
Creators: name: Nagornov, Iurii S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Genomics (q-bio.GN)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: Motivation: A branching processes model yields an unevenly stochastically distributed dataset that consists of sparse and dense regions. This work addresses the problem of precisely evaluating parameters for such a model. Applying a branching processes model to an area such as cancer cell evolution faces a number of obstacles, including high dimensionality and the rare appearance of a result of interest. We take on the ambitious task of obtaining the coefficients of a model that reflects the relationship of driver gene mutations and cancer hallmarks on the basis of personal data regarding variant allele frequencies. Results: An approximate Bayesian computation method based on Isolation Kernel is developed. The method involves the transformation of row data to a Hilbert space (mapping) and the measurement of the similarity between simulated points and maxima weighted Isolation Kernel mapping related to the observation point. We also design a heuristic algorithm for parameter estimation that requires no calculation and is dimension independent. The advantages of the proposed machine learning method are illustrated using multidimensional test data as well as a specific example focused on cancer cell evolution.
title: Object detection with MicrosoftHoloLens 2. A comparison between image and point cloud based algorithms
Creators: name: Herrmann, Sophie
Publisher: name: TU Wien
Year: 2021
Subjects: subject: Object Detection
subject: VoteNet
subject: YOLO
subject: Deep Learning
subject: Point Clouds

description: Object detection is a central task in computer vision, which tries to identify and locate objects in a scene. After the era of hand-crafted features and limited accuracy, 2014 AlexNet brought the attention to neural networks and deep learning. Accuracy increased and inference time decreased significantly and it came to a boom of 2D image-based object detection networks. Nowadays a huge number of 2D object detection algorithms are available, but they have one main drawback, they only provide two dimensional bounding boxes. This is an issue as a number of modern applications operate in the three dimensional world, therefore also require accurate 3D information. Mainly over the last decade 3D object detection algorithms evolved leveraging deep neural networks. This thesis focuses on comparing accuracy and inference time of 2D and 3D object detection algorithms, evaluating whether the additional information provided by 3D algorithms comes at the cost of lower accuracy and / or slower inference times.To enable such an evaluation a comparable 2D - 3D dataset is created. Due to the availability of both a 2D and 3D measurement device and ease of use, head mounted Augmented Reality glasses are used for data acquisition. Special considerations are applied to the data acquisition setup, selected categories and environmental / lightning conditions, to allow detailed analysis of key properties of 2D respectively 3D object detection algorithms. Acquired data is further processed to clean data and annotate objects. The comparison is based on one representative object detection algorithm per domain, YOLOv3 is selected as 2D algorithm, VoteNet as 3D algorithm. Multiple sets of hyperparameters are tested and the best models are finally compared.The evaluation shows that 2D and 3D accuracy results are with AP2D−50 = 0.94 andAP3D−50 = 0.96 very similar and 3D results are even slightly better. The main downside of 3D compared to 2D algorithms is the inference time which is — though achieving real-time — with 19.04ms respectively 1.55ms by a factor ten slower in this experiment. A detailed analysis per category and condition shows that the accuracy of the 3D algorithm mainly depends on the number of object points and their density, while 2D algorithms benefit most from large object size.
Role of colliding geometry on the balance energy of mass-asymmetric systems
Creators: name: Goyal, Supriya
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the role of colliding geometry on the balance energy (Ebal) of mass-asymmetric systems by varying the mass asymmetry (η = AT - Ap/AT + AP, where AT and AP are the masses of the target and projectile, respectively) from 0.1 to 0.7, over the mass range 40-240 and on the mass dependence of the balance energy. Our findings reveal that colliding geometry has a significant effect on the Ebal of asymmetric systems. We find that, as we go from central collisions to peripheral ones, the effect of mass asymmetry on Ebal increases throughout the mass range. Interestingly, we find that for every fixed system mass (Atot) the effect of the impact parameter variation is almost uniform throughout the mass-asymmetry range. For each η, Ebal follows a power-law behavior (\propto Aτ) at all colliding geometries
description: 5 pages, 5 figures, Accepted in PRC
Dynamics of a cold trapped ion in a Bose-Einstein condensate
Creators: name: Schmid, Stefan
name: Härter, Arne
name: Denschlag, Johannes Hecker
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We investigate the interaction of a laser-cooled trapped ion (Ba$^+$ or Rb$^+$) with an optically confined $^{87}$Rb Bose-Einstein condensate (BEC). The system features interesting dynamics of the ion and the atom cloud as determined by their collisions and their motion in their respective traps. Elastic as well as inelastic processes are observed and their respective cross sections are determined. We demonstrate that a single ion can be used to probe the density profile of an ultracold atom cloud.
description: 4 pages, 5 figures
title: ÐÑÐ°Ð²Ð¾Ð²Ð¾Ðµ ÑÐµÐ³ÑÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ ÑÐ½ÐµÑÐ³Ð¾ÑÐ½Ð°Ð±Ð¶ÐµÐ½Ð¸Ñ Ð² Ð°Ð³ÑÐ¾Ð¿ÑÐ¾Ð¼ÑÑÐ»ÐµÐ½Ð½Ð¾Ð¼ ÐºÐ¾Ð¼Ð¿Ð»ÐµÐºÑÐµ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Legal regulation of energy supply in the agro-industrial complex
Creators: name: ÐÐ»Ð»Ð°Ð¼ÑÑÐ°Ð´Ð¾Ð², ÐÑÐ¼Ð¸ÑÐ¸Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2019
Subjects: ÑÐ½ÐµÑÐ³Ð¾ÑÐ½Ð°Ð±Ð¶ÐµÐ½Ð¸Ñ
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description: ÐÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð¿ÑÐ°Ð²Ð¾Ð²Ð¾Ð³Ð¾ ÑÐµÐ³ÑÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ ÑÐ½ÐµÑÐ³Ð¾ÑÐ½Ð°Ð±Ð¶ÐµÐ½Ð¸Ñ Ð² Ð°Ð³ÑÐ¾Ð¿ÑÐ¾Ð¼ÑÑÐ»ÐµÐ½Ð½Ð¾Ð¼ ÐºÐ¾Ð¼Ð¿Ð»ÐµÐºÑÐµ Ð² Ð Ð¾ÑÑÐ¸Ð¹ÑÐºÐ¾Ð¹ Ð¤ÐµÐ´ÐµÑÐ°ÑÐ¸Ð¸. Ð Ð°ÑÑÐ¼Ð°ÑÑÐ¸Ð²Ð°ÐµÑÑÑ ÑÐ°ÐºÐ¾Ðµ Ð¿Ð¾Ð½ÑÑÐ¸Ðµ, ÐºÐ°Ðº Â«ÑÐ½ÐµÑÐ³Ð¾ÑÐ½Ð°Ð±Ð¶ÐµÐ½Ð¸ÑÂ», Ð¾Ð¿ÑÐµÐ´ÐµÐ»ÑÑÑÑÑ Ð¸ÑÑÐ¾ÑÐ½Ð¸ÐºÐ¸ Ð¿ÑÐ°Ð²Ð°, Ð½Ð° Ð¾ÑÐ½Ð¾Ð²Ð°Ð½Ð¸Ð¸ ÐºÐ¾ÑÐ¾ÑÑÑ Ð¾ÑÑÑÐµÑÑÐ²Ð»ÑÐµÑÑÑ Ð´Ð°Ð½Ð½ÑÐ¹ Ð¿ÑÐ¾ÑÐµÑÑ Ð¸ Ð²Ð¾Ð·Ð¼Ð¾Ð¶Ð½ÑÐµ Ð¿ÑÑÐ¸ Ð¾Ð¿ÑÐ¸Ð¼Ð¸Ð·Ð°ÑÐ¸Ð¸ Ð Ð¾ÑÑÐ¸Ð¹ÑÐºÐ¾Ð³Ð¾ Ð·Ð°ÐºÐ¾Ð½Ð¾Ð´Ð°ÑÐµÐ»ÑÑÑÐ²Ð°. Ð ÑÐ°Ð±Ð¾ÑÐµ Ð°Ð½Ð°Ð»Ð¸Ð·Ð¸ÑÑÑÑÑÑ Ð¾ÑÐ½Ð¾Ð²Ð½ÑÐµ Ð¿ÑÐ¾Ð±Ð»ÐµÐ¼Ñ Ð´ÐµÐ¹ÑÑÐ²ÑÑÑÐµÐ³Ð¾ ÑÐ½ÐµÑÐ³ÐµÑÐ¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð·Ð°ÐºÐ¾Ð½Ð¾Ð´Ð°ÑÐµÐ»ÑÑÑÐ²Ð°, ÑÐºÐ°Ð·ÑÐ²Ð°ÑÑÑÑ Ð²Ð¾Ð·Ð¼Ð¾Ð¶Ð½ÑÐµ Ð¿ÑÑÐ¸ Ð¸Ñ ÑÐµÑÐµÐ½Ð¸Ñ. ÐÐ½ÐµÑÐµÐ½Ñ Ð¿ÑÐµÐ´Ð»Ð¾Ð¶ÐµÐ½Ð¸Ñ Ð¿Ð¾ ÑÐ¾Ð²ÐµÑÑÐµÐ½ÑÑÐ²Ð¾Ð²Ð°Ð½Ð¸Ñ Ð·Ð°ÐºÐ¾Ð½Ð¾Ð´Ð°ÑÐµÐ»ÑÑÑÐ²Ð° Ð Ð¾ÑÑÐ¸Ð¹ÑÐºÐ¾Ð¹ Ð¤ÐµÐ´ÐµÑÐ°ÑÐ¸Ð¸.
description: The final qualifying paper is devoted to the study of the legal regulation of energy supply in the agro-industrial complex in the Russian Federation. Such a concept as âenergy supplyâ is considered, sources of law are determined, on the basis of which this process is carried out, tendencies for further development of legal regulation of energy supply in the agro-industrial complex and possible ways of optimizing Russian legislation are established. The paper analyzes the main problems of the current energy legislation, identifies possible solutions. Proposals to improve the legislation of the Russian Federation.
Geometrically Higher Order Unfitted Space-Time Methods for PDEs on Moving Domains
Creators: name: Heimann, Fabian
name: Lehrenfeld, Christoph
name: Preuß, Janosch
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: In this paper, we propose new geometrically unfitted space-time Finite Element methods for partial differential equations posed on moving domains of higher order accuracy in space and time. As a model problem, the convection-diffusion problem on a moving domain is studied. For geometrically higher order accuracy, we apply a parametric mapping on a background space-time tensor-product mesh. Concerning discretisation in time, we consider discontinuous Galerkin, as well as related continuous (Petrov-)Galerkin and Galerkin collocation methods. For stabilisation with respect to bad cut configurations and as an extension mechanism that is required for the latter two schemes, a ghost penalty stabilisation is employed. The article puts an emphasis on the techniques that allow to achieve a robust but higher order geometry handling for smooth domains. We investigate the computational properties of the respective methods in a series of numerical experiments. These include studies in different dimensions for different polynomial degrees in space and time, validating the higher order accuracy in both variables.
The ALPS project release 2.0: Open source software for strongly correlated systems
Creators: name: Bauer, B.
name: Carr, L. D.
name: Evertz, H. G.
name: Feiguin, A.
name: Freire, J.
name: Fuchs, S.
name: Gamper, L.
name: Gukelberger, J.
name: Gull, E.
name: Guertler, S.
name: Hehn, A.
name: Igarashi, R.
name: Isakov, S. V.
name: Koop, D.
name: Ma, P. N.
name: Mates, P.
name: Matsuo, H.
name: Parcollet, O.
name: Pawlowski, G.
name: Picon, J. D.
name: Pollet, L.
name: Santos, E.
name: Scarola, V. W.
name: Schollwöck, U.
name: Silva, C.
name: Surer, B.
name: Todo, S.
name: Trebst, S.
name: Troyer, M.
name: Wall, M. L.
name: Werner, P.
name: Wessel, S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present release 2.0 of the ALPS (Algorithms and Libraries for Physics Simulations) project, an open source software project to develop libraries and application programs for the simulation of strongly correlated quantum lattice models such as quantum magnets, lattice bosons, and strongly correlated fermion systems. The code development is centered on common XML and HDF5 data formats, libraries to simplify and speed up code development, common evaluation and plotting tools, and simulation programs. The programs enable non-experts to start carrying out serial or parallel numerical simulations by providing basic implementations of the important algorithms for quantum lattice models: classical and quantum Monte Carlo (QMC) using non-local updates, extended ensemble simulations, exact and full diagonalization (ED), the density matrix renormalization group (DMRG) both in a static version and a dynamic time-evolving block decimation (TEBD) code, and quantum Monte Carlo solvers for dynamical mean field theory (DMFT). The ALPS libraries provide a powerful framework for programers to develop their own applications, which, for instance, greatly simplify the steps of porting a serial code onto a parallel, distributed memory machine. Major changes in release 2.0 include the use of HDF5 for binary data, evaluation tools in Python, support for the Windows operating system, the use of CMake as build system and binary installation packages for Mac OS X and Windows, and integration with the VisTrails workflow provenance tool. The software is available from our web server at http://alps.comp-phys.org/.
description: 18 pages + 4 appendices, 7 figures, 12 code examples, 2 tables
Topological bands in the PdSe$_2$ pentagonal monolayer
Creators: name: Bravo, Sergio
name: Pacheco, M.
name: Correa, J. D.
name: Chico, Leonor
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electronic structure of monolayer pentagonal palladium diselenide (PdSe2) is analyzed from the topological band theory perspective. Employing first-principles calculations, effective models and symmetry indicators, we find that the low-lying conduction bands are topologically nontrivial, protected by time reversal and crystalline symmetries. Numerical evidence supporting the nontrivial character of the bands is presented. Furthermore, we obtain a relevant physical response from the topological viewpoint, such as the spin Hall conductivity.
description: Published version, 8 pages + 6 figures. SI included
Fluctuation-induced forces between atoms and surfaces: the Casimir-Polder interaction
Creators: name: Intravaia, F.
name: Henkel, C.
name: Antezza, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Electromagnetic fluctuation-induced forces between atoms and surfaces are generally known as Casimir-Polder interactions. The exact knowledge of these forces is rapidly becoming important in modern experimental set-ups and for technological applications. Recent theoretical and experimental investigations have shown that such an interaction is tunable in strength and sign, opening new perspectives to investigate aspects of quantum field theory and condensed-matter physics. In this Chapter we review the theory of fluctuation-induced interactions between atoms and a surface, paying particular attention to the physical characterization of the system. We also survey some recent developments concerning the role of temperature, situations out of thermal equilibrium, and measurements involving ultra-cold atoms.
description: 44 pages, 14 figure. Invited review paper to appear in Lecture Notes in Physics for a volume on "Casimir physics" edited by D. Dalvit, P. Milonni, D. Roberts, and F. da Rosa. Publisher Springer-Verlag (2010)
Non-Boussinesq subgrid-scale model with dynamic tensorial coefficients
Creators: name: Agrawal, Rahul
name: Whitmore, Michael P.
name: Griffin, Kevin P.
name: Bose, Sanjeeb T.
name: Moin, Parviz
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: A major drawback of Boussinesq-type subgrid-scale stress models used in large-eddy simulations is the inherent assumption of alignment between large-scale strain rates and filtered subgrid-stresses. A priori analyses using direct numerical simulation (DNS) data has shown that this assumption is invalid locally as subgrid-scale stresses are poorly correlated with the large-scale strain rates [Bardina et al., AIAA 1980; Meneveau and Liu, Ann. Rev. Fluid Mech. 2002]. In the present work, a new, non-Boussinesq subgrid-scale model is presented where the model coefficients are computed dynamically. Some previous non-Boussinesq models have observed issues in providing adequate dissipation of turbulent kinetic energy [e.g.: Bardina et al., AIAA 1980; Clark et al. J. Fluid Mech., 1979; Stolz and Adams, Phys. of Fluids, 1999]; however, the present model is shown to provide sufficient dissipation using dynamic coefficients. Modeled subgrid-scale Reynolds stresses satisfy the consistency requirements of the governing equations for LES, vanish in laminar flow and at solid boundaries, and have the correct asymptotic behavior in the near-wall region of a turbulent boundary layer. The new model, referred to as the dynamic tensor-coefficient Smagorinsky model (DTCSM), has been tested in simulations of canonical flows: decaying and forced homogeneous isotropic turbulence (HIT), and wall-modeled turbulent channel flow at high Reynolds numbers; the results show favorable agreement with DNS data. In order to assess the performance of DTCSM in more complex flows, wall-modeled simulations of high Reynolds number flow over a Gaussian bump exhibiting smooth-body flow separation are performed. Predictions of surface pressure and skin friction, compared against DNS and experimental data, show improved accuracy from DTCSM in comparison to the existing static coefficient (Vreman) and dynamic Smagorinsky model.
description: Revised Manuscript, under Review, Physical Review Fluids
Characteristics of the electric field accompanying a longitudinal acoustic wave in a metal. Anomaly in the superconducting phase
Creators: name: Avramenko, Yu. A.
name: Bezuglyi, E. V.
name: Burma, N. G.
name: Kolobov, I. G.
name: Fil', V. D.
name: Shevchenko, O. A.
name: Gokhfeld, V. M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The temperature dependence of the amplitude and phase of the electric potential arising at a plane boundary of a conductor when a longitudinal acoustic wave is incident normally on it is investigated theoretically and experimentally. The surface potential is formed by two contributions, one of which is spatially periodic inside the sample, with the period of the acoustic field; the second is aperiodic and arises as a result of an additional nonuniformity of the electron distribution in a surface layer of the metal. In the nonlocal region the second contribution is dominant. The phases of these contributions are shifted by approximately π/2. For metals in the normal state the experiment is in qualitative agreement with the theory. The superconducting transition is accompanied by catastrophically rapid vanishing of the electric potential, in sharp contrast to the theoretical estimates, which predict behavior similar to the BCS dependence of the attenuation coefficient for a longitudinal sound.
description: 9 pages, 6 figures
Being there : understanding the support systems of adults 50 years and older with mental health concerns who live in a rural community in BC
Creators: name: Paterson, Carley Erin
Publisher: name: University of British Columbia
Year: 2021

description: The people we connect with, socially and personally, are important for our well-being. This is especially true for adults with mental health concerns (MHC), such as depression and anxiety, or substance use problems. Despite wanting to be connected, they often become socially isolated. Support can be especially important for those who are 50 years and older and live in a rural community where health and social services are limited. However, research focusing on those who provide this support is limited. This thesis explored the experiences and perspectives of family, friends, and co-workers who provide social/personal support to individuals with MHCs 50 years or older in BC rural communities. Nine individuals who provide support to adults 50 years and older with some type of MHC in various rural BC communities were interviewed. Interpretive descriptive qualitative methods were used, and the findings were interpreted and analyzed using a theoretical framework based in ecological systems theory. The importance of contextual factors that impacted these relationships were identified, including the influence of the COVID-19 pandemic, age-related factors, and the context of the rural community. Three themes were identified: ‘the makings of a deep connection,’ ‘behind the scenes of a relationship,’ and ‘the pressure and burden of providing support.’ The first theme highlighted the components of the deep connection in these relationships, characterized by the importance of communication and engaging in activity with or for each other. Factors 'behind the scenes of these relationships' included participants’ personal responsibilities or their own MHC. These contributed to feelings of pressure and burden. Other factors that contributed to the sense of burden included a feeling that they were alone in providing support. These feelings of pressure and burden negatively impacted the deep connections. In contrast, motivations identified in the second theme, such as love and connection, contributed positively to relationships and, at times, helped to lessen the feelings of pressure and burden. These findings informed recommendations made for policy development, health service development, and future research.
Transverse hydrodynamics and the early-thermalization problem at RHIC
Creators: name: Ryblewski, Radoslaw
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The problem of early thermalization of matter produced in relativistic heavy-ion collisions at RHIC is discussed in the framework of a hybrid model that consists of the transverse-hydrodynamics stage followed by the standard perfect-fluid hydrodynamics stage and freeze-out. The two hydrodynamic regimes are connected with the help of Landau matching conditions. A satisfactory description of the soft hadronic observables is achieved. This indicates that the early-thermalization problem and also the HBT puzzle may be to large extent circumvented.
description: To appear in the conference proceedings for Hot Quarks 2010 Conference in June 21-26, La Londe-les-Maures, French Riviera, 4 pages, 3 figures
The effective stability parameter for two-component galactic discs: Is 1/Q ~ 1/Q_stars + 1/Q_gas ?
Creators: name: Romeo, Alessandro B.
name: Wiegert, Joachim
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The Wang-Silk approximation, 1/Q ~ 1/Q_stars + 1/Q_gas, is frequently used for estimating the effective Q parameter in two-component discs of stars and gas. Here we analyse this approximation in detail, and show how its accuracy depends on the radial velocity dispersions and Toomre parameters of the two components. We then propose a much more accurate but still simple approximation for the effective Q parameter, which further takes into account the stabilizing effect of disc thickness. Our effective Q parameter is a natural generalization of Toomre's Q, and as such can be used in a wide variety of contexts, e.g. for predicting star formation thresholds in galaxies or for measuring the stability level of galactic discs at low and high redshifts.
description: MNRAS, in press
Theoretical spectra of photoevaporating protoplanetary discs: An atlas of atomic and low-ionisation emission lines
Creators: name: Ercolano, Barbara
name: Owen, James E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present a calculation of the atomic and low-ionisation emission line spectra of photoevaporating protoplanetary discs. Line luminosities and profiles are obtained from detailed photoionisation calculations of the disc and wind structures surrounding young active solar-type stars. The disc and wind density and velocity fields were obtained from the recently developed radiation-hydrodynamic models of Owen et al., that include stellar X-ray and EUV irradiation of protoplanetary discs at various stages of clearing, from primordial sources to inner hole sources of various hole sizes. Our models compare favourably with currently available observations, lending support to an X-ray driven photoevaporation model for disc dispersal. In particular, we find that X-rays drive a warm, predominantly neutral flow where the OI 6300A line can be produced by neutral hydrogen collisional excitation. Our models can, for the first time, provide a very good match to both luminosities and profiles of the low-velocity component of the OI 6300A line and other forbidden lines observed by Hartigan et al., which covered a large sample of T-Tauri stars. We find that the OI 6300A and the NeII 12.8um lines are predominantly produced in the X-ray-driven wind and thus appear blue-shifted by a few km/s for some of the systems when observed at non-edge-on inclinations. We note however that blue-shifts are only produced under certain conditions: X-ray luminosity, spectral shape and inner hole size all affect the location of the emitting region and the physical conditions in the wind. We caution therefore that while a blueshifted line is a tell-tale sign of an outflow, the lack of a blueshift should not be necessarily interpreted as a lack of outflow.
description: 18 pages, 7 figures, accepted to be published in MNRAS - changes in the revised version: reference list updated
USTC-NELSLIP at SemEval-2022 Task 11: Gazetteer-Adapted Integration Network for Multilingual Complex Named Entity Recognition
Creators: name: Chen, Beiduo
name: Ma, Jun-Yu
name: Qi, Jiajun
name: Guo, Wu
name: Ling, Zhen-Hua
name: Liu, Quan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: This paper describes the system developed by the USTC-NELSLIP team for SemEval-2022 Task 11 Multilingual Complex Named Entity Recognition (MultiCoNER). We propose a gazetteer-adapted integration network (GAIN) to improve the performance of language models for recognizing complex named entities. The method first adapts the representations of gazetteer networks to those of language models by minimizing the KL divergence between them. After adaptation, these two networks are then integrated for backend supervised named entity recognition (NER) training. The proposed method is applied to several state-of-the-art Transformer-based NER models with a gazetteer built from Wikidata, and shows great generalization ability across them. The final predictions are derived from an ensemble of these trained models. Experimental results and detailed analysis verify the effectiveness of the proposed method. The official results show that our system ranked 1st on three tracks (Chinese, Code-mixed and Bangla) and 2nd on the other ten tracks in this task.
description: Winner system (USTC-NELSLIP) of SemEval 2022 MultiCoNER shared task on 3 tracks (Chinese, Bangla, Code-mixed)
The second Voronoi conjecture on parallelohedra for zonotopes
Creators: name: Garber, Alexey
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 52B20, 52C22

description: We prove the second Voronoi conjecture on parallelohedra for zonotope. We show that for a given face-to-face tiling of d-dimensional Euclidean space into parallel copies of zonotope Z there are d vectors, connecting centers of zonotopes with common facet, that are basis of the correspondent lattice of the tiling.
description: 6 pages, available in English or Russian
Eileen Christ and H. Bruce Rinker, (Editors), 'Gaia in Turmoil:  Climate Change, Biodepletion and Earth Ethics in an Age of Crisis'
Creators: name: Schwartzman, David
Publisher: name: Cultural Logic: A Journal of Marxist Theory & Practice
Year: 2019

description: Cultural Logic: A Journal of Marxist Theory & Practice, Vol 16 (2009)
Direct Observation of the Cooling of the Cassiopeia A Neutron Star
Creators: name: Heinke, Craig O.
name: Ho, Wynn C. G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The cooling rate of young neutron stars gives direct insight into their internal makeup. Although the temperatures of several young neutron stars have been measured, until now a young neutron star has never been observed to decrease in temperature over time. We fit 9 years of archival Chandra ACIS spectra of the likely neutron star in the ~330 years old Cassiopeia A supernova remnant with our non-magnetic carbon atmosphere model. Our fits show a relative decline in the surface temperature by 4% (5.4 sigma, from 2.12+-0.01*10^6 K in 2000 to 2.04+-0.01*10^6 K in 2009) and observed flux (by 21%). Using a simple model for neutron star cooling, we show that this temperature decline could indicate that the neutron star became isothermal sometime between 1965 and 1980, and constrains some combinations of neutrino emission mechanisms and envelope compositions. However, the neutron star is likely to have become isothermal soon after formation, in which case the temperature history suggests episodes of additional heating or more rapid cooling. Observations over the next few years will allow us to test possible explanations for the temperature evolution.
description: ApJ Letters, in press. 5 pages, 2 color figures
Pornography and romantic relationships : a model-based cluster analysis approach
Creators: name: Musolino, Evanya Angela
Publisher: name: University of British Columbia
Year: 2021

description: The ability to develop intimate and satisfying relationships is integral to happiness in humans. Given the impact of relationships on well-being, research has increasingly sought to explore the factors that differentiate happy, successful relationships from their unhappy, unsuccessful counterparts. One factor that has begun to receive more attention is the use of pornography by one and/or both partners. Despite numerous attempts to expose the effects of consuming such material, findings have been largely inconsistent and conflicting. These inconsistent and conflicting findings have raised questions about the utility of previous empirical investigations on the construct of pornography and its associated effects at both the individual and relational level. As such, the present study was designed to address some of the existing gaps in the literature specific to how pornography impacts the functioning of romantic relationships. Initially, the goal was to recruit both members of heterosexual romantic dyads and independently survey members on individual (e.g., self-esteem) and relational characteristics (e.g., relationship satisfaction). However, due to difficulties associated with recruiting both members of romantic dyads, a decision was made to modify the research direction. Instead, a primary focus was placed on analyzing the individual-level data and the dyad-level data was used as supplementary. In total, 2714 individuals (1043 self-identified as men; 1671 self-identified as women) completed the online questionnaire, and 91 romantic couples were used to conduct the dyadic analyses. Model-based cluster analysis was the analytic technique of choice as it allowed for the exploration of naturally occurring groupings or clusters. As expected, the use of pornography generated a number of different clusters for both the men and the women. While there was a plethora of interesting findings that emerged, there were three key findings that should be noted: (a) the results highlighted the sheer complexity of romantic relationships and served as a reminder that the direction of relationships between variables (e.g., conflict and relationship satisfaction) is rarely predictable, (b) the results provided some evidence in support of the existence of double standards in romantic relationships, and (c) the results highlighted some notable discrepancies between men and women in terms of predilections to respond to sensitive questions in a manner that serves to preserve the overall perception of romantic relationships.
О программе разработки российских газотурбинных энерготехнологий
Creators: name: Петреня, Юрий Кириллович
Publisher: name: Научно-технические ведомости СПбПУ. Естественные и инженерные науки
Year: 2019
Subjects: subject: газовые энергетические турбины
subject: современная и перспективная энергетика
subject: энергоэффективность
subject: энергобезопасность
subject: фундаментальные исследования
subject: комплексная инвестиционная научно-исследовательская программа (национальный проект)
subject: gas energy turbines
subject: modern and future energy
subject: energy efficiency
subject: energy security
subject: basic research
subject: a comprehensive investment research program (national project)

description: Газу отведена важнейшая роль в текущем и перспективном топливном энергетическом балансе России и многих стран, включая США и Европу. Применение газотурбинных энергетических технологий, достигших высокого уровня развития, обеспечивает повышение энергоэффективности и конкурентоспособности российской энергетики. Перспективный рынок этих технологий представляет большой интерес для российской промышленности, в том числе и для повышения её экспортного потенциала. В России есть опыт разработки и освоения газовых энергетических турбин, большой научный и промышленный потенциал для разработки газовых энергетических технологий конкурентного мирового уровня. Предложено реализовать комплексную научно-технологическую инвестиционную программу (национальный проект) по данному направлению. Отмечено, что развитие отечественных газотурбинных энерготехнологий – один из важнейших приоритетов обеспечения энергобезопасности и научно-технологического развития Российской Федерации. Реализацию этого мультидисциплинарного в научном и прикладном плане проекта, координацию работ и кооперацию академической, отраслевой и вузовской науки с промышленностью предложено проводить под научно-методическим руководством РАН (ОЭММПУ РАН).
title: ÐÑÐ°Ð²Ð¾Ð²Ð¾Ð¹ Ð¼ÐµÑ Ð°Ð½Ð¸Ð·Ð¼ ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð¸Ð½ÑÑÐ¸ÑÑÑÐ° Ð¾Ð¿ÐµÐºÐ¸ Ð¸ Ð¿Ð¾Ð¿ÐµÑÐ¸ÑÐµÐ»ÑÑÑÐ²Ð° Ð½Ð°Ð´ Ð½ÐµÑÐ¾Ð²ÐµÑÑÐµÐ½Ð½Ð¾Ð»ÐµÑÐ½Ð¸Ð¼Ð¸ Ð´ÐµÑÑÐ¼Ð¸ Ð² Ð¾ÑÐ½Ð¾Ð²Ð½ÑÑ Ð¿ÑÐ°Ð²Ð¾Ð²ÑÑ ÑÐ¸ÑÑÐµÐ¼Ð°Ñ : ÑÑÐ°Ð²Ð½Ð¸ÑÐµÐ»ÑÐ½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð·
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: The legal mechanism of the functioning of the institution of guardianship and guardianship of minor children in the main legal systems: a comparative analysis
Creators: name: ÐÐ°ÑÐ°Ð½Ð¾Ð², ÐÑÑÐµÐ½
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: Ð¿ÑÐ°Ð²Ð¾Ð²Ð¾Ð¹ Ð¼ÐµÑ Ð°Ð½Ð¸Ð·Ð¼
Ð¸Ð½ÑÑÐ¸ÑÑÑ Ð¾Ð¿ÐµÐºÐ¸ Ð¸ Ð¿Ð¾Ð¿ÐµÑÐ¸ÑÐµÐ»ÑÑÑÐ²Ð°
Ð½ÐµÑÐ¾Ð²ÐµÑÑÐµÐ½Ð½Ð¾Ð»ÐµÑÐ½Ð¸Ðµ Ð´ÐµÑÐ¸
Ð¿ÑÐ°Ð²Ð¾Ð²ÑÐµ ÑÐ¸ÑÑÐµÐ¼Ñ
legal mechanism
institute of guardians and guardians
minors
legal systems

description: Ð Ð´Ð°Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÐµ Ð¸Ð·Ð»Ð¾Ð¶ÐµÐ½Ð° ÑÑÑÐ½Ð¾ÑÑÑ Ð´ÐµÐ¹ÑÑÐ²Ð¸Ñ Ð¸Ð½ÑÑÐ¸ÑÑÑÐ° Ð¾Ð¿ÐµÐºÐ¸ Ð¸ Ð¿Ð¾Ð¿ÐµÑÐ¸ÑÐµÐ»ÑÑÑÐ²Ð° Ð½Ð°Ð´ Ð½ÐµÑÐ¾Ð²ÐµÑÑÐµÐ½Ð½Ð¾Ð»ÐµÑÐ½Ð¸Ð¼Ð¸ Ð´ÐµÑÑÐ¼Ð¸ Ð½Ð° Ð¿ÑÐ¸Ð¼ÐµÑÐµ ÑÐ°Ð·Ð»Ð¸ÑÐ½ÑÑ Ð¿ÑÐ°Ð²Ð¾Ð²ÑÑ ÑÐ¸ÑÑÐµÐ¼. ÐÑÐ¾Ð²ÐµÐ´ÐµÐ½ ÑÑÐ°Ð²Ð½Ð¸ÑÐµÐ»ÑÐ½Ð¾-Ð¿ÑÐ°Ð²Ð¾Ð²Ð¾Ð¹ Ð°Ð½Ð°Ð»Ð¸Ð· Ð¸Ð½ÑÑÐ¸ÑÑÑÐ° Ð¾Ð¿ÐµÐºÐ¸ Ð¸ Ð¿Ð¾Ð¿ÐµÑÐ¸ÑÐµÐ»ÑÑÑÐ²Ð° Ð² ÑÐ°Ð·Ð½ÑÑ Ð¿ÑÐ°Ð²Ð¾Ð²ÑÑ ÑÐ¸ÑÑÐµÐ¼Ð°Ñ Ð½Ð° Ð¿ÑÐ¸Ð¼ÐµÑÐµ ÑÐ°Ð·Ð½ÑÑ ÑÑÑÐ°Ð½, Ð² ÑÐ¾Ð¼ ÑÐ¸ÑÐ»Ðµ Ð·Ð°ÑÑÐ¾Ð½ÑÑÑ ÑÑÑÐ°Ð½Ñ Ð¼ÑÑÑÐ»ÑÐ¼Ð°Ð½ÑÐºÐ¾Ð³Ð¾ Ð¸ Ð°Ð½Ð³Ð»Ð¾-ÑÐ°ÐºÑÐ¾Ð½ÑÐºÐ¾Ð³Ð¾ Ð¿ÑÐ°Ð²Ð°. Ð ÐµÐ·ÑÐ»ÑÑÐ°ÑÐ¾Ð¼ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð²ÑÐ¿ÑÑÐºÐ½Ð¾Ð¹ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ° ÑÐ²Ð»ÑÑÑÑÑ Ð¿ÑÐµÐ´Ð»Ð¾Ð¶ÐµÐ½Ð¸Ñ Ð¿Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ Ð¿ÑÐ°Ð²Ð¾Ð²ÑÑ Ð¿ÑÐ¾Ð±Ð»ÐµÐ¼, Ð²Ð¾Ð·Ð½Ð¸ÐºÐ°ÑÑÐ¸Ñ Ð² Ð¾ÑÐ½Ð¾Ð²Ð½ÑÑ Ð¿ÑÐ°Ð²Ð¾Ð²ÑÑ ÑÐ¸ÑÑÐµÐ¼Ð°Ñ Ð² Ð¾Ð±Ð»Ð°ÑÑÐ¸ ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð¸Ð½ÑÑÐ¸ÑÑÑÐ° Ð¾Ð¿ÐµÐºÐ¸ Ð¸ Ð¿Ð¾Ð¿ÐµÑÐ¸ÑÐµÐ»ÑÑÑÐ²Ð°.
description: This work outlines the essence of the institution of guardianship and guardianship over minor children using the example of various legal systems. A comparative legal analysis of the institution of guardianship and trusteeship in different legal systems is carried out on the example of different countries, including the countries of Muslim and Anglo-Saxon law. The result of the re-search of the graduate qualification work of a bachelor is proposals for solving legal problems arising in the main legal systems in the field of the functioning of the institution of guardianship and trusteeship.
Shifting physics of vortex particles to higher energies via quantum entanglement
Creators: name: Karlovets, D. V.
name: Baturin, S. S.
name: Geloni, G.
name: Sizykh, G. K.
name: Serbo, V. G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Accelerator Physics (physics.acc-ph)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Physics of structured waves is currently limited to relatively small particle energies as the available generation techniques are only applicable to the soft $X$-ray twisted photons, to the beams of electron microscopes, to cold neutrons, or non-relativistic atoms. The highly energetic vortex particles with an orbital angular momentum would come in handy for a number of experiments in atomic physics, nuclear, hadronic, and accelerator physics, and to generate them one needs to develop alternative methods, applicable for ultrarelativistic energies and for composite particles. Here, we show that the vortex states of in principle arbitrary particles can be generated during photon emission in helical undulators, via Cherenkov radiation, in collisions of charged particles with intense laser beams, in such scattering or annihilation processes as $eμ\to eμ, ep \to ep, e^-e^+ \to p\bar{p}$, and so forth. The key element in obtaining them is the postselection protocol due to entanglement between a pair of final particles and it is largely not the process itself. The state of a final particle -- be it a $γ$-ray, a hadron, a nucleus, or an ion -- becomes twisted if the azimuthal angle of the other particle momentum is measured with a large error or is not measured at all. As a result, requirements to the beam transverse coherence can be greatly relaxed, which enables the generation of highly energetic vortex beams at accelerators and synchrotron radiation facilities, thus making them a new tool for hadronic and spin studies.
Компьютерное моделирование режимов работы систем электроснабжения с нелинейной нагрузкой
Creators: name: Костин, Владимир Николаевич
name: Сериков, Владимир Александрович
Publisher: name: St. Petersburg Polytechnic University Journal of Engineering Science and Technology
Year: 2019
Subjects: subject: высшие гармоники
subject: конденсаторные батареи
subject: компьютерное моделирование
subject: компенсация реактивной мощности
subject: резонансные режимы
subject: harmonics
subject: capacitor batteries
subject: сomputer simulation
subject: compensation of reactive power
subject: resonance mode

description: В программном комплексе Multisim выполнено исследование режимов работы системы электроснабжения 6–10/0,4 кВ, включающей линейную и нелинейную (выпрямитель) нагрузки и конденсаторную батарею на стороне низшего напряжения. Выявлены зависимости величин высших гармоник тока, генерируемых нелинейной нагрузкой, от степени компенсации реактивной мощности и соотношения мощностей линейной и нелинейной нагрузок. Оценена величина суммарного тока, протекающего через конденсаторную батарею, в режимах близких к резонансным. Установлено, что в таких режимах в интервале коммутации тока вентилями появляются апериодическая и колебательная составляющие, а гармоники тока, генерируемые выпрямителем, существенно уменьшаются по сравнению с режимами отсутствия резонанса. Показано, что в резонансных и близких к ним режимах качество напряжения не соответствует нормам. Проведено сравнение результатов моделирования для трехфазной и упрощенной однофазной моделей.
Classical mechanics of many particles defined on canonically deformed nonrelativistic space-time
Creators: name: Daszkiewicz, Marcin
name: Walczyk, Cezary J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We provide the classical mechanics of many particles moving in canonically twist-deformed space-time. In particular, we consider two examples of such noncommutative systems - the set of N particles moving in gravitational field as well as the system of N interacting harmonic oscillators.
description: 15 pages, no figures
Bloch theorem dictated wave chaos in microcavity crystals
Creators: name: Yi, Chang-Hwan
name: Park, Hee Chul
name: Park, Moon Jip
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chaotic Dynamics (nlin.CD)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Universality class of wave chaos emerges in many areas of science, such as molecular dynamics, optics, and network theory. In this work, we generalize the wave chaos theory to cavity lattice systems by discovering the intrinsic coupling of the crystal momentum to the internal cavity dynamics. The cavity-momentum locking substitutes the role of the deformed boundary shape in the ordinary single microcavity problem, providing a new platform for the in situ study of microcavity light dynamics. The transmutation of wave chaos in periodic lattices leads to a phase space reconfiguration that induces a dynamical localization transition. The degenerate scar-mode spinors hybridize and non-trivially localize around regular islands in phase space. In addition, we find that the momentum coupling becomes maximal at the Brillouin zone boundary, so the intercavity chaotic modes coupling and wave confinement are significantly altered. Our work pioneers the study of intertwining wave chaos in periodic systems and provide useful applications in light dynamics control.
description: 6+16 pages+5 figures