cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Mechanics and energetics of electromembranes
Creators: name: Bense, Hadrien
name: Roman, Benoît
name: Andreotti, Bruno
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The recent discovery of electro-active polymers has shown great promises in the field of soft robotics, and was logically followed by experimental, numerical and theoretical developments. Most of these studies were concerned with systems entirely covered by electrodes. However, there is a growing interest for partially active polymers, in which the electrode covers only one part of the membrane. Indeed, such actuation can trigger buckling instabilities and so represents a route toward the control of 3D shapes. Here, we study theoretically the behaviour of such partially active electro-active polymer. We address two problems: (i) the electrostatic elastica including geometric non-linearities and partially electro-active strip using a variational approach. We propose a new interpretation of the equations of deformation, by drawing analogies with biological growth, in which the effect of the electric voltage is seen as a change in the reference stress-free state. (ii) we explain the nature of the distribution of electrostatic forces on this simple system, which is not trivial. In particular we find that edge effects are playing a major role in this problem.
description: soft robotics, Mary Ann Liebert, Inc., 2020
Nonequilibrium and Fluctuation Relation
Creators: name: Gallavotti, Giovanni
Publisher: name: arXiv
Year: 2019
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A review on the fluctuation relation, fluctuation theorem and related topics.
description: 34 pages, added publication reference, typos amended. Erratum replaces the removed Appendix D; in Sec.18, reference to it is modified
Neutron emission from fracturing of granite blocks: An experimental revisitation
Creators: name: Benetti, P.
name: Boffelli, F.
name: Marciano, C.
name: Piazzoli, A.
name: Raselli, G. L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: A series of experimental tests, such as those of Carpinteri et al. (2013), have been performed. The aim was to check the emission of neutrons in the fracture of Luserna granite blocks under mechanical loading, as reported by the above mentioned authors. No neutrons have been detected and some doubts have emerged on the soundness of the previous measurements.
Η αρχαία ελληνική θρησκεία στα σχολικά εγχειρίδια της Πρωτοβάθμιας Εκπαίδευσης:
Creators: name: Πέτλης, Βασίλειος Ευαγγέλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Αρχαία θρησκεία
Εγχειρίδια
Ancient religion
Books

description: Η αρχαία ελληνική θρησκεία διαπότιζε και χαρακτήριζε το σύνολο του αρχαιοελληνικού πολιτισμού. Δεν ήταν απλώς ένα μικρό μέρος μιας ολότητας, ένα ακόμα πολιτιστικό προϊόν, αλλά ο ζωγραφικός καμβάς, το φόντο, πάνω στο οποίο ιστορούνται – ζωγραφίζονται τα επιμέρους πολιτιστικά στοιχεία. Αυτά με τη σειρά τους ενώνονται οργανικά και άρρηκτα με τη συνδρομή της θρησκείας, για να μας παρουσιάσουν ένα εξαιρετικό αποτέλεσμα που ονομάζουμε «ελληνικό πολιτισμό». Το καταλληλότερο όχημα που θα μεταφέρει το απόσταγμα του αρχαίου πολιτισμού στη σημερινή πραγματικότητα είναι το σχολικό εγχειρίδιο. Μπορεί να ζούμε στην εποχή των πολυμέσων, το βιβλίο όμως παραμένει το βασικό μέσο διδασκαλίας, ο κύριος φορέας παροχής της πληροφορίας, με αποδέκτες τους μαθητές.Η συνολική εικόνα που αποκομίζει κάποιος όταν μελετά την αρχαία ελληνική θρησκεία μέσα από τα εγχειρίδια της Πρωτοβάθμιας εκπαίδευσης είναι ικανοποιητική. Η ποιότητα, το εύρος και το βάθος των πληροφοριών είναι ανάλογα με την ηλικία προς την οποία απευθύνονται. Ας μην ξεχνάμε ότι στην υποχρεωτική εκπαίδευση υπάρχουν και οι τρεις τάξεις του Γυμνασίου, όπου παρουσιάζεται η ελληνική θρησκεία με λεπτομερέστερο και πληρέστερο τρόπο κι έτσι ολοκληρώνεται η εικόνα της.
description: The Ancient Hellenic Religion was the backbone of the entirety of the ancient Hellenic civilization. It was not just a small part of an entirety, just another civil product, but the canvas on which all the other civil elements were told and presented. And it is with the support of the religion that all these elements are instrumentally united in order to present us with the excellent result that we call “Hellenic Civilization” The best vessel to transfer the summary of the ancient civilization in today’s society is our textbooks. Although we live in an electronic era, the textbook remains the basic educational tool, the main information provider to our students. Satisfactory is the whole picture that the one who studies the ancient Hellenic religion in the primary education textbooks gets. The quality, the width and the depth of the information is age appropriate. Let’s not forget that there is three more years of mandatory High School education, during which Hellenic Religion is presented in greater integrated detail.
Quantum time of flight distribution for cold trapped atoms
Creators: name: Ali, Md. Manirul
name: Home, Dipankar
name: Majumdar, A. S.
name: Pan, Alok K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The time of flight distribution for a cloud of cold atoms falling freely under gravity is considered. We generalise the probability current density approach to calculate the quantum arrival time distribution for the mixed state describing the Maxwell-Boltzmann distribution of velocities for the falling atoms. We find an empirically testable difference between the time of flight distribution calculated using the quantum probability current and that obtained from a purely classical treatment which is usually employed in analysing time of flight measurements. The classical time of flight distribution matches with the quantum distribution in the large mass and high temperature limits.
description: 6 pages, RevTex, 4 eps figures
Voler-Coller : stop au plagiat !
Creators: name: Latour Marie
Publisher: name: Zenodo
Year: 2023
Subjects: formation
compétences informationnelles
plagiat
bibliothèque
library
plagiarism

description: Ce poster présenté à l'édition 2023 des Journées nationales du Formateur (JNF) organisée à Marseille par l'Association des directeurs des bibliothèques universitaires (ADBU) expose les principaux tenants du projet de pédagogie ludique sur le plagiat mené au Service commun de la documentation (SCD) de l'Université de Guyane (UG), et soutenu par le Ministère de l’Enseignement supérieur et de la recherche dans le cadre de l’appel à projet « AMI EMERGENCES » Sa présentation fera suite à un atelier mené à ce même congrès autour de la version béta du jeu « To be in the norms » qui sera intégré à ce module de formation à distance.

Contact : marie.latour@unc.nc
Locally solvable maximal subgroups in division rings
Creators: name: Khanh, Huynh Viet
name: Hai, Bui Xuan
Publisher: name: arXiv
Year: 2019
Subjects: subject: Rings and Algebras (math.RA)
subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: Let $D$ be a division ring with center $F$, and $G$ an almost subnormal subgroup of $D^*$. In this paper, we show that if $G$ contains a non-abelian locally solvable maximal subgroup, then $D$ must be a cyclic algebra of prime degree over $F$. Moreover, it is proved that every locally nilpotent maximal subgroup of $G$ is abelian.
description: This version[v3] was accepted for publication in Kyoto Journal of Mathematics in 2022. Comparing to the version v2, the title of the paper has been changed and some theorems were renumbered. The version v2 was entitled "On almost subnormal subgroups in division rings". Also, the two main results Theorems 3.10 and 3.11 in v2 were renumbered as Theorems 1.1 and 1.2 in the accepted version v3
First detection of photospheric depletion in the LMC
Creators: name: Reyniers, M.
name: Van Winckel, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recent photospheric abundance studies of galactic field RV Tauri stars show that depletion of refractory elements is rather common in these evolved objects. The process that creates this chemical anomaly is not understood well, but it probably requires the presence of gravitationally bound dust in a binary system. We test for the presence of depletion in extra-galactic objects. A detailed photospheric abundance study on the basis of high-quality UVES spectra was performed on the RV Tauri star in the LMC: MACHO82.8405.15. Abundances were derived using a critically compiled line list with accurate log(gf) values and the latest Kurucz model atmospheres. With [Fe/H]=-2.6 in combination with [Zn/Fe]=+2.3 and [S/Ti]=+2.5, MACHO82.8405.15 displays a strong depletion abundance pattern. The effect of the depletion is comparable to the strongest depletions seen in field Galactic RV Tauri stars. The chemical analysis of MACHO82.8405.15 proves that the depletion process also occurs in the extragalactic members of the RV Tauri pulsation class. Our program star is a member of a larger sample of LMC RV Tauri objects. This sample is unique, since the distances of the members are well-constrained. Further studies of this sample are therefore expected to gain deeper insight into the poorly understood depletion phenomenon and of the evolutionary status of RV Tauri stars in general.
description: 4 pages, 5 figures, accepted by A&A Letters
From topological recursion to wave functions and PDEs quantizing hyperelliptic curves
Creators: name: Eynard, Bertrand
name: Garcia-Failde, Elba
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 34M56, 34M55, 34M60, 34E20, 35J10, 60B20

description: Starting from loop equations, we prove that the wave functions constructed from topological recursion on families of degree $2$ spectral curves with a global involution satisfy a system of partial differential equations, whose equations can be seen as quantizations of the original spectral curves. The families of spectral curves can be parametrized with the so-called times, defined as periods on second type cycles, and with the poles. These equations can be used to prove that the WKB solution of many isomonodromic systems coincides with the topological recursion wave function, which proves that the topological recursion wave function is annihilated by a quantum curve. This recovers many known quantum curves for genus zero spectral curves and generalizes this construction to hyperelliptic curves.
description: 39 pages
SeqMix: Augmenting Active Sequence Labeling via Sequence Mixup
Creators: name: Zhang, Rongzhi
name: Yu, Yue
name: Zhang, Chao
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Active learning is an important technique for low-resource sequence labeling tasks. However, current active sequence labeling methods use the queried samples alone in each iteration, which is an inefficient way of leveraging human annotations. We propose a simple but effective data augmentation method to improve the label efficiency of active sequence labeling. Our method, SeqMix, simply augments the queried samples by generating extra labeled sequences in each iteration. The key difficulty is to generate plausible sequences along with token-level labels. In SeqMix, we address this challenge by performing mixup for both sequences and token-level labels of the queried samples. Furthermore, we design a discriminator during sequence mixup, which judges whether the generated sequences are plausible or not. Our experiments on Named Entity Recognition and Event Detection tasks show that SeqMix can improve the standard active sequence labeling method by $2.27\%$--$3.75\%$ in terms of $F_1$ scores. The code and data for SeqMix can be found at https://github.com/rz-zhang/SeqMix
description: EMNLP 2020 Long Paper
Yangians and Mickelsson Algebras II
Creators: name: Khoroshkin, Sergey
name: Nazarov, Maxim
Publisher: name: arXiv
Year: 2006
Subjects: subject: Representation Theory (math.RT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 17B35; 81R50

description: We study a composition of two functors. The first one, from the category of modules over the Lie algebra $\gl_m$ to the category of modules over the degenerate affine Hecke algebra of $GL_N$, was introduced by I. Cherednik. The second functor is a skew version of the functor from the latter category to the category of modules over the Yangian $\Y(\gl_n)$ due to V. Drinfeld. We give a representation theoretic explanation of a link between intertwining operators on tensor products of $\Y(\gl_n)$-modules, and the `extremal cocycle' on the Weyl group of $\gl_m$ introduced by D. Zhelobenko. We establish a connection between the composition of two functors, and the `centralizer construction' of the Yangian $\Y(\gl_n)$ discovered by G. Olshanski.
description: 26 pages
The nomenclature of vertebrate olfactory receptors
Creators: name: Olender, Tsviya
name: Jones, Tamsin
name: Bruford, Elspeth
name: Lancet, Doron
Publisher: name: F1000 Research Limited
Year: 2019

description: Olfactory receptor (ORs) are GPCRs with a crucial role in odor detection. A typical mammalian genome harbors ~1000 OR genes and pseudogenes; however, different gene duplication/deletion events have occurred in each species, resulting in complex orthology relationships. While for human a widely accepted nomenclature is available, based on phylogenetic classification into 18 families and further into subfamilies, for other mammals different nomenclature systems are used, concealing important evolutionary insights. We developed the Mutual Maximum Similarity (MMS) algorithm, a systematic classifier for assigning a human-centric nomenclature to any OR gene based on inter-species hierarchical pairwise similarities, and applied it to the OR repertoires of 7 mammals and zebrafish (10,247 ORs). The availability of a unified nomenclature provides a framework for evolutionary studies, where textual symbol comparison allows an immediate identification of potential orthologs and species-specific expansions/deletions, e.g. Or52e5 and Or52e5b represent a duplication of OR52E5 in rat. Another example is the absence of OR6Z subfamily among primate OR symbols. In other mammals, OR6Z members are disposed in one genomic cluster, suggesting a large deletion in the primate lineage.
This unified nomenclature is applied by the Vertebrate Gene Nomenclature Committee and its implementation is under consideration by relevant species-specific nomenclature committees.
The role of core-collapse physics in the observability of black-hole neutron-star mergers as multi-messenger sources
Creators: name: Román-Garza, Jaime
name: Bavera, Simone S.
name: Fragos, Tassos
name: Zapartas, Emmanouil
name: Misra, Devina
name: Andrews, Jeff
name: Coughlin, Scotty
name: Dotter, Aaron
name: Kovlakas, Konstantinos
name: Serra, Juan Gabriel
name: Qin, Ying
name: Rocha, Kyle A.
name: Tran, Nam Hai
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recent detailed 1D core-collapse simulations have brought new insights on the final fate of massive stars, which are in contrast to commonly used parametric prescriptions. In this work, we explore the implications of these results to the formation of coalescing black-hole (BH) - neutron-star (NS) binaries, such as the candidate event GW190426_152155 reported in GWTC-2. Furthermore, we investigate the effects of natal kicks and the NS's radius on the synthesis of such systems and potential electromagnetic counterparts linked to them. Synthetic models based on detailed core-collapse simulations result in an increased merger detection rate of BH-NS systems ($\sim 2.3$ yr$^{-1}$), 5 to 10 times larger than the predictions of "standard" parametric prescriptions. This is primarily due to the formation of low-mass BH via direct collapse, and hence no natal kicks, favored by the detailed simulations. The fraction of observed systems that will produce an electromagnetic counterpart, with the detailed supernova engine, ranges from $2$-$25$%, depending on uncertainties in the NS equation of state. Notably, in most merging systems with electromagnetic counterparts, the NS is the first-born compact object, as long as the NS's radius is $\lesssim 12\,\mathrm{km}$. Furthermore, core-collapse models that predict the formation of low-mass BHs with negligible natal kicks increase the detection rate of GW190426_152155-like events to $\sim 0.6 \, $yr$^{-1}$; with an associated probability of electromagnetic counterpart $\leq 10$% for all supernova engines. However, increasing the production of direct-collapse low-mass BHs also increases the synthesis of binary BHs, over-predicting their measured local merger density rate. In all cases, models based on detailed core-collapse simulation predict a ratio of BH-NSs to binary BHs merger rate density that is at least twice as high as other prescriptions.
description: 13 pages, 5 figures, 3 tables
INTEGRALLASH USULLARI
Creators: name: O'zbekistan RespublikasiIIV Qoraqalpoq akademik litseyi  matematika fani o'qituvchisi  Ibragimov Rinat Tayirbekovich Abdiniyazova Sawlexan Joldasbaevna
Publisher: name: Zenodo
Year: 2024

description: Ushbu maqolada integrallash usullari haqida so`z yuritilgan bo`lib, bevosita integrallash usuli, differensial belgisi ostiga kiritish usuli hamda kasr ratsional funktsiyalarni integrallash usuli haqida so`z yuritilgan.

Kalit so`zlar: integrallash usuli, ratsional funktsiyalar, differensial belgi, bevosita integrallash usuli, integrallash
Hilbert-Schmidt Operators and Frames - Classification, Approximation by Multipliers and Algorithms
Creators: name: Balazs, Peter
Publisher: name: arXiv
Year: 2006
Subjects: subject: Functional Analysis (math.FA)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 41A58, 47B10, 65F30

description: In this paper we deal with the connection of frames with the class of Hilbert Schmidt operators. First we give an easy criteria for operators being in this class using frames. It is the equivalent to the criteria using orthonormal bases. Then we construct Bessel sequences frames and Riesz bases for the class of Hilbert Schmidt operators using the tensor product of such sequences in the original Hilbert space. We investigate how the Hilbert Schmidt inner product of an arbitrary operator and such a rank one operator can be calculated in an efficient way. Finally we give an algorithm to find the best approximation, in the Hilbert Schmidt sense, of arbitrary matrices by operators called frame multipliers, which multiply the analysis coefficents by a fixed symbol followed by a synthesis.
description: 20 pages, one figure; preprint
A Unified Linear Speedup Analysis of Federated Averaging and Nesterov FedAvg
Creators: name: Qu, Zhaonan
name: Lin, Kaixiang
name: Li, Zhaojian
name: Zhou, Jiayu
name: Zhou, Zhengyuan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Federated learning (FL) learns a model jointly from a set of participating devices without sharing each other's privately held data. The characteristics of non-i.i.d. data across the network, low device participation, high communication costs, and the mandate that data remain private bring challenges in understanding the convergence of FL algorithms, particularly regarding how convergence scales with the number of participating devices. In this paper, we focus on Federated Averaging (FedAvg), one of the most popular and effective FL algorithms in use today, as well as its Nesterov accelerated variant, and conduct a systematic study of how their convergence scale with the number of participating devices under non-i.i.d. data and partial participation in convex settings. We provide a unified analysis that establishes convergence guarantees for FedAvg under strongly convex, convex, and overparameterized strongly convex problems. We show that FedAvg enjoys linear speedup in each case, although with different convergence rates and communication efficiencies. For strongly convex and convex problems, we also characterize the corresponding convergence rates for the Nesterov accelerated FedAvg algorithm, which are the first linear speedup guarantees for momentum variants of FedAvg in convex settings. Empirical studies of the algorithms in various settings have supported our theoretical results.
BGGAN: Bokeh-Glass Generative Adversarial Network for Rendering Realistic Bokeh
Creators: name: Qian, Ming
name: Qiao, Congyu
name: Lin, Jiamin
name: Guo, Zhenyu
name: Li, Chenghua
name: Leng, Cong
name: Cheng, Jian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A photo captured with bokeh effect often means objects in focus are sharp while the out-of-focus areas are all blurred. DSLR can easily render this kind of effect naturally. However, due to the limitation of sensors, smartphones cannot capture images with depth-of-field effects directly. In this paper, we propose a novel generator called Glass-Net, which generates bokeh images not relying on complex hardware. Meanwhile, the GAN-based method and perceptual loss are combined for rendering a realistic bokeh effect in the stage of finetuning the model. Moreover, Instance Normalization(IN) is reimplemented in our network, which ensures our tflite model with IN can be accelerated on smartphone GPU. Experiments show that our method is able to render a high-quality bokeh effect and process one $1024 \times 1536$ pixel image in 1.9 seconds on all smartphone chipsets. This approach ranked First in AIM 2020 Rendering Realistic Bokeh Challenge Track 1 \& Track 2.
description: accepted by ECCV workshop 2020
Modelling of Urban Near-Road Atmospheric PM Concentrations Using an Artificial Neural Network Approach with Acoustic Data Input
Creators: name: Paas, Bastian
name: Stienen, Jonas
name: Vorländer, Michael
name: Schneider, Christoph
Publisher: name: Humboldt-Universität zu Berlin
Year: 2017
Subjects: subject: ANN
subject: neural networks
subject: machine learning
subject: particulate matter
subject: prediction
subject: motor traffic
subject: acoustics
subject: sound
subject: 333.7 Natürliche Resourcen, Energie und Umwelt

description: Air quality assessment is an important task for local authorities due to several adverse health effects that are associated with exposure to e.g., urban particle concentrations throughout the world. Based on the consumption of costs and time related to the experimental works required for standardized measurements of particle concentration in the atmosphere, other methods such as modelling arise as integrative options, on condition that model performance reaches certain quality standards. This study presents an Artificial Neural Network (ANN) approach to predict atmospheric concentrations of particle mass considering particles with an aerodynamic diameter of 0.25–1 μm (PM(0.25–1)), 0.25–2.5 μm (PM(0.25–2.5)), 0.25–10 μm (PM(0.25–10)) as well as particle number concentrations of particles with an aerodynamic diameter of 0.25–2.5 μm (PNC(0.25–2.5)). ANN model input variables were defined using data of local sound measurements, concentrations of background particle transport and standard meteorological data. A methodology including input variable selection, data splitting and an evaluation of their performance is proposed. The ANN models were developed and tested by the use of a data set that was collected in a street canyon. The ANN models were applied furthermore to a research site featuring an inner-city park to test the ability of the approach to gather spatial information of aerosol concentrations. It was observed that ANN model predictions of PM(0.25–10) and PNC(0.25–2.5) within the street canyon case as well as predictions of PM(0.25–2.5), PM(0.25–10) and PNC(0.25–2.5) within the case study of the park area show good agreement to observations and meet quality standards proposed by the European Commission regarding mean value prediction. Results indicate that the ANN models proposed can be a fairly accurate tool for assessment in predicting particle concentrations not only in time but also in space.
Agent-based Models of Financial Markets
Creators: name: Samanidou, E.
name: Zschischang, E.
name: Stauffer, D.
name: Lux, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Trading and Market Microstructure (q-fin.TR)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: This review deals with several microscopic (``agent-based'') models of financial markets which have been studied by economists and physicists over the last decade: Kim-Markowitz, Levy-Levy-Solomon, Cont-Bouchaud, Solomon-Weisbuch, Lux-Marchesi, Donangelo-Sneppen and Solomon-Levy-Huang. After an overview of simulation approaches in financial economics, we first give a summary of the Donangelo-Sneppen model of monetary exchange and compare it with related models in economics literature. Our selective review then outlines the main ingredients of some influential early models of multi-agent dynamics in financial markets (Kim-Markowitz, Levy-Levy-Solomon). As will be seen, these contributions draw their inspiration from the complex appearance of investors' interactions in real-life markets. Their main aim is to reproduce (and, thereby, provide possible explanations) for the spectacular bubbles and crashes seen in certain historical episodes, but they lack (like almost all the work before 1998 or so) a perspective in terms of the universal statistical features of financial time series.
description: Long review. Accepted by Reports on Progress in Physics
Sound event localization and detection based on crnn using rectangular filters and channel rotation data augmentation
Creators: name: Ronchini, Francesca
name: Arteaga, Daniel
name: Pérez-López, Andrés
Publisher: name: arXiv
Year: 2020
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: Sound (cs.SD)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Sound Event Localization and Detection refers to the problem of identifying the presence of independent or temporally-overlapped sound sources, correctly identifying to which sound class it belongs, estimating their spatial directions while they are active. In the last years, neural networks have become the prevailing method for sound Event Localization and Detection task, with convolutional recurrent neural networks being among the most used systems. This paper presents a system submitted to the Detection and Classification of Acoustic Scenes and Events 2020 Challenge Task 3. The algorithm consists of a convolutional recurrent neural network using rectangular filters, specialized in recognizing significant spectral features related to the task. In order to further improve the score and to generalize the system performance to unseen data, the training dataset size has been increased using data augmentation. The technique used for that is based on channel rotations and reflection on the xy plane in the First Order Ambisonic domain, which allows improving Direction of Arrival labels keeping the physical relationships between channels. Evaluation results on the development dataset show that the proposed system outperforms the baseline results, considerably improving Error Rate and F-score for location-aware detection.
Eigenvalues of tridiagonal Hermitian Toeplitz matrices with perturbations in the off-diagonal corners
Creators: name: Grudsky, Sergei M.
name: Maximenko, Egor A.
name: Soto-González, Alejandro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Functional Analysis (math.FA)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: (2010): 15B05, 15A18, 41A60, 65F15, 47A55

description: In this paper we study the eigenvalues of Hermitian Toeplitz matrices with the entries $2,-1,0,\ldots,0,-α$ in the first column. Notice that the generating symbol depends on the order $n$ of the matrix. If $|α|\le 1$, then the eigenvalues belong to $[0,4]$ and are asymptotically distributed as the function $g(x)=4\sin^2(x/2)$ on $[0,π]$. The situation changes drastically when $|α|>1$ and $n$ tends to infinity. Then the two extreme eigenvalues (the minimal and the maximal one) lay out of $[0,4]$ and converge rapidly to certain limits determined by the value of $α$, whilst all others belong to $[0,4]$ and are asymptotically distributed as $g$. In all cases, we transform the characteristic equation to a form convenient to solve by numerical methods, and derive asymptotic formulas for the eigenvalues.
description: 22 pages, 4 figures
Reduction of symplectic groupoids and quotients of quasi-Poisson manifolds
Creators: name: Álvarez, D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: In this work we study the integrability of quotients of quasi-Poisson manifolds. Our approach allows us to put several classical results about the integrability of Poisson quotients in a common framework. By categorifying one of the already known methods of reducing symplectic groupoids we also describe double symplectic groupoids which integrate the recently introduced Poisson groupoid structures on gauge groupoids.
description: This is a re-elaboration of Section 5 of arXiv:1910.06164v1
Taxonomic study of Trillium ovatum forma hibbersonii
Creators: name: O’Neill, Darlene
Publisher: name: University of British Columbia
Year: 2009

description: The entity known as Trillium ovatum forma hibbersonii Taylor and Szczawinski was first discovered on the west coast of Vancouver Island in 1938 by JA. Hibberson (Holotype UBC 73131). Leonard Wiley invalidly published the taxon as Trillium hibbersonii in 1968. A review of the taxonomic status by T.M.C. Taylor and A.F. Szczawinski resulted in the publication of the taxon as Trillium ovatum forma hibbersonii (1975). The diagnosis stated this dwarf variant was part of the continuous series of intergradations of Trillium ovatum Pursh (Taylor and Szczawinski, 1975). Taylor and Szczawinski did not cite any small or intermediate samples that supported their conclusions. The present study was initiated to provide a comprehensive re-evaluation of the taxonomic status: separate species from Trillium ovatum; subspecies, variety or forma of Trillium ovatum? This study considers morphological differences, flavonoid analysis and Random Amplified Polymorphic DNA (RAPD), from natural populations and cultivated plants. I conclude that compelling evidence supports the raising of Trillium ovatum forma hibbersonii to specific status. Characteristics which support this conclusion are: 1) the limited geographical distribution of Trillium ovatum forma hibbersonii 2) different ecological niche and strong morphological divergence from Trillium ovatum 3) distinct dormancy/germination requirements 4) quantitative differences in the major flavonoid constituents of T. ovatum and T. ovatum forma hibbersonii
Beam Cooling with ionisation losses
Creators: name: Rubbia, C.
name: Ferrari, A.
name: Kadi, Y.
name: Vlachoudis, V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A novel type of particle "cooling", called Ionization Cooling, is applicable to slow (v of the order of 0.1c) ions stored in a small ring. The many traversals through a thin foil enhance the nuclear reaction probability, in a steady configuration in which ionisation losses are recovered at each turn by a RF-cavity. For a uniform target "foil" the longitudinal momentum spread diverges exponentially since faster (slower) particles ionise less (more) than the average. In order to "cool" also longitudinally, a chromaticity has to be introduced with a wedge shaped "foil". Multiple scattering and straggling are then "cooled" in all three dimensions, with a method similar to the one of synchrotron cooling, but valid for low energy ions. Particles then stably circulate in the beam indefinitely, until they undergo for instance nuclear processes in the thin target foil. This new method is under consideration for the nuclear production of a few MeV/A ion beams. Simple reactions, for instance Li 7 + D Li 8 + p, are more favourably exploited with the heavier ion colliding against a gas-jet D2 target. Kinematics is generally very favourable, with emission angles in a narrow angular cone and a relatively concentrated outgoing energy spectrum which allows an efficient collection as a neutral gas in a tiny volume with a technology at high temperatures perfected at ISOLDE. It is however of a much more general applicability. The method appears capable of producing a "table top" storage ring with an accumulation rate in excess of 10**14 Li-8 radioactive ion/s for possible use for radioactive beams for physics studies (for example for beta-beams) or for therapy.
description: 27 pages, 11 figures
Para-Grassmann Variables and Coherent States
Creators: name: Cabra, Daniel C.
name: Moreno, Enrique F.
name: Tanasa, Adrian
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The definitions of para-Grassmann variables and q-oscillator algebras are recalled. Some new properties are given. We then introduce appropriate coherent states as well as their dual states. This allows us to obtain a formula for the trace of a operator expressed as a function of the creation and annihilation operators.
description: This is a contribution to the Proc. of the O'Raifeartaigh Symposium on Non-Perturbative and Symmetry Methods in Field Theory (June 2006, Budapest, Hungary), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
X-Ray Study of Temperature and Abundance Profiles of the Cluster of Galaxies Abell 1060 with Suzaku
Creators: name: Sato, Kosuke
name: Yamasaki, Noriko Y.
name: Ishida, Manabu
name: Ishisaki, Yoshitaka
name: Ohashi, Takaya
name: Kawahara, Hajime
name: Kitaguchi, Takao
name: Kawaharada, Madoka
name: Kokubun, Motohide
name: Makishima, Kazuo
name: Ota, Naomi
name: Nakazawa, Kazuhiro
name: Tamura, Takayuki
name: Matsushita, Kyoko
name: Kawano, Naomi
name: Fukazawa, Yasushi
name: Hughes, John P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We carried out observations of the central and 20' east offset regions of the cluster of galaxies Abell 1060 with Suzaku. Spatially resolved X-ray spectral analysis has revealed temperature and abundance profiles of Abell 1060 out to 27' ~ 380; /h_70 kpc, which corresponded to ~ 0.25; r_180. Temperature decrease of the intra cluster medium from 3.4 keV at the center to 2.2 keV in the outskirt region are clearly observed. Abundances of Si, S and Fe also decrease by more than 50% from the center to the outer, while Mg shows fairly constant abundance distribution at ~ 0.7 solar within r < 17'. O shows lower abundance of ~ 0.3 solar in the central region (r~ 6'), and indicates a similar feature with Mg, however it is sensitive to the estimated contribution of the Galactic components of kT_1 ~ 0.15 keV and kT_2 ~ 0.7 keV in the outer annuli (r ~ 13'). Systematic effects due to the point spread function tails, contamination on the XIS filters, instrumental background, cosmic and/or Galactic X-ray background, and the assumed solar abundance tables are carefully examined. Results on temperature and abundances of Si, S, and Fe are consistent with those derived by XMM-Newton at r < 13'. Formation and metal enrichment process of the cluster are discussed based on the present results.
description: 20 pages, 19 figures, accepted for publication in PASJ
Review of Core Process Representation in Power System Operational Models: Gaps, Challenges, and Opportunities for Multisector Dynamics Research
Creators: name: Oikonomou, K.
name: Kern, J.
name: Tarroja, B.
name: Voisin, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Power grid operations increasingly interact with environmental systems and human systems such as transportation, agriculture, the economy, and financial markets. Our objective is to discuss the modelling gaps and opportunities to advance the science for multisector adaptation and tradeoffs. We focus on power system operational models, which typically represent key physical and economic aspects of grid operations over days to a year and assume a fixed power grid infrastructure. Due to computational burden, models are typically customized to reflect regional resource opportunities, data availability, and applications of interest. While there are model intercomparison papers, there is however no model-agnostic characterization and systematic overview of the state-of-the-art process representations in operational power system models. To address our objective, we conceptualize power system operational models with four core processes: physical grid assets (generation, transmission, loads, and storage), model objectives and purpose, institutions and decision agents, and performance metrics. We taxonomize the representations of these core processes based on a review of 23 existing open-source and commercial models. As we acknowledge the computational burden of certain representations, we leverage this taxonomy to describe tradeoffs in process fidelity and tractability that have been adopted by the research community to address interactions between the power grid and hydrometeorological uncertainties, global change, and/or technological innovation. The core process taxonomy along with the existing computational tradeoffs are used to identify technical gaps and recommend future model development needs and research directions to better represent power grid operations as part of integrated multisector dynamics modeling and interdisciplinary research.
Magnetic Phase Control in Monolayer Films by Substrate Tuning
Creators: name: Ferriani, P.
name: Turek, I.
name: Heinze, S.
name: Bihlmayer, G.
name: Blügel, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose to tailor exchange interactions in magnetic monolayer films by tuning the adjacent non-magnetic substrate. As an example, we demonstrate a ferromagnetic-antiferromagnetic phase transition for one monolayer Fe on a Ta(x)W(1-x)(001) surface as a function of the Ta concentration. At the critical Ta concentration, the nearest-neighbor exchange interaction is small and the magnetic phase space is dramatically broadened. Complex magnetic order such as spin-spirals, multiple-Q, or even disordered local moment states can occur, offering the possibility to store information in terms of ferromagnetic dots in an otherwise zero-magnetization state matrix.
description: after minor changes, 5 pages, 5 figures, revtex4
ҚИШЛОҚ ХЎЖАЛИГИНИ КОЛЛЕКТИВЛАШТИРИШ ЖАРАЁНИДА ДЕҲҚОН ХЎЖАЛИКЛАРИНИНГ ҚАТАҒОН ҚИЛИНИШИ ТАРИХШУНОСЛИГИ
Creators: name: Матбобоев, Азамат
Publisher: name: Zenodo
Year: 2024

description: Ушбу мақолада Ўзбекистонда қишлоқ хўжалигини ёппасига коллективлаштириш даврида совет ҳокимиятининг деҳқон хўжаликларини қатағон қилиш сиёсати тарихшунослиги ўрганилган. Мавзуга оид илмий адабиётлар даврлар бўйича гуруҳлаштирилган ва таҳлил этилган.
Euler-Poincare reduction for discrete field theories
Creators: name: Vankerschaver, Joris
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 58H05; 65P10; 70S10

description: In this note, we develop a theory of Euler-Poincare reduction for discrete Lagrangian field theories. We introduce the concept of Euler-Poincare equations for discrete field theories, as well as a natural extension of the Moser-Veselov scheme, and show that both are equivalent. The resulting discrete field equations are interpreted in terms of discrete differential geometry. An application to the theory of discrete harmonic mappings is also briefly discussed.
description: 24 pages, 3 figures (v2: simplified treatment)
Poincaré and transportation inequalities for Gibbs measures under the Dobrushin uniqueness condition
Creators: name: Wu, Liming
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60E15, 60K35 (Primary) 60G60 (Secondary)

description: In in this paper we establish an explicit and sharp estimate of the spectral gap (Poincaré inequality) and the transportation inequality for Gibbs measures, under the Dobrushin uniqueness condition. Moreover, we give a generalization of the Liggett's $M-ε$ theorem for interacting particle systems.
description: Published at http://dx.doi.org/10.1214/009117906000000368 in the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Ionized gas in the NGC 3077 galaxy
Creators: name: Oparin, D. V.
name: Egorov, O. V.
name: Moiseev, A. V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The nearby dwarf galaxy NGC 3077 is known for its peculiar morphology, which includes numerous dust lanes and emission-line regions. The interstellar medium in this galaxy is subject to several perturbing factors. These are primarily the central starburst and tidal structures in the M 81 group. We present a comprehensive study of the state of ionization, kinematics, and chemical composition of ionized gas in NGC 3077, including both star-forming regions and diffuse ionized gas (DIG) at the periphery. We study gas motions in the H$α$ line via high-resolution ($R\approx15\,000$) 3D spectroscopy with the scanning Fabry-Perot interferometer installed into SCORPIO-2 instrument attached to the 6-m telescope of the SAO RAS. Images in the main optical emission lines were acquired with MaNGaL photometer with a tunable filter at the 2.5-m telescope of the Caucasian Mountain Observatory of SAI MSU. We also used SCORPIO-2 to perform long-slit spectroscopy of the galaxy with a resolution of $R\approx1\,000$. Our estimate of the gas metallicity, $Z=0.6Z_\odot$, is significantly lower than the earlier determination, but agrees with the "luminosity--metallicity" dependence. Spatially resolved diagnostic diagrams of the emission-line ratios do not show correlations between the gas ionization state and its velocity dispersion, and this is most likely due to strong ionization by young stars, whereas the contribution of shocks to the excitation of emission lines is less important. We also studied the locations of multicomponent H$α$ profiles and provide arguments suggesting that they are mostly associated with individual kinematic components along the line of sight and not with expanding shells as it was believed earlier. We also observe there a combination of wind outflow from star-forming regions and accretion from interstellar gas clouds in the M 81 group.
description: 14 pages, 6 figures
Viscosity, Reversibillity, Chaotic Hypothesis, Fluctuation Theorem and Lyapunov Pairing
Creators: name: Gallavotti, Giovanni
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Incompressible fluid equations are studied with UV cut-off and in periodic boundary conditions. Properties of the resulting ODEs holding uniformly in the cut-off are considered and, in particular, are conjectured to be equivalent to properties of other time reversible equations. Reversible equations with the same regularization and describing equivalently the fluid, and the fluctuations of large classes of observables, are examined in the context of the "Chaotic Hypothesis", "Axiom C" and the "Fluctuation Theorem".
description: Version 3:Appendix C removed (together with reference to it following Eq. (A.7)) due to errors in an attempt to understand heuristically the apparent approximate symmetry of the Lyapunov exponents. Former Appendix D is now Appendix C
An X-ray study for white dwarf binary AR Scorpii
Creators: name: Takata, J.
name: Wang, X. F.
name: Wang, H. H.
name: Lin, L. C. -C.
name: Hu, C. -P.
name: Li, K. L.
name: Kong, A. K. H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report a study of the X-ray emission from the white dwarf/M-type star binary system AR Scorpii using archival data taken in 2016-2020. It has been known that the X-ray emission is dominated by the optically thin thermal plasma emission, and its flux level varies significantly over the orbital phase. The X-ray emission also contains a component that modulates with the beat frequency between the white dwarf's spin frequency and orbital frequency. In this new analysis, the 2020 data taken by NICER shows that the X-ray emission is modulating with the spin frequency as well as the beat frequency, indicating that part of the X-ray emission is coming from the white dwarf's magnetosphere. It is found that the signal of the spin frequency appears only at a specific orbital phase, while the beat signal appears over the orbital phase. We interpret the X-ray emission modulating with the spin frequency and the beat frequency as a result of the synchrotron emission from electrons with a smaller and larger pitch angle, respectively. In a long-term evolution, the beat pulse profile averaged over the orbital phase changed from a single-peak structure in 2016/2018 to a double-peak structure in 2020. The observed X-ray flux levels measured in 2016/2017 are higher than those measured in 2018/2020. The plasma temperature and amplitude of the orbital waveform might vary with time too. These results indicate that the X-ray emission from AR Scorpii evolves on a timescale of years. This long-term evolution would be explained by a super-orbital modulation related to, for example, a precession of the white dwarf, or a fluctuation of the system related to activity of the companion star.
description: 14 pages, 5 tables, 11 figures. Accepted to ApJ