cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Toward a terahertz-driven electron gun
Creators: name: Huang, W. Ronny
name: Nanni, Emilio A.
name: Ravi, Koustuban
name: Hong, Kyung-Han
name: Wong, Liang Jie
name: Keathley, Phillip D.
name: Fallahi, A.
name: Zapata, Luis
name: Kärtner, Franz X.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Femtosecond electron bunches with keV energies and eV energy spread are needed by condensed matter physicists to resolve state transitions in carbon nanotubes, molecular structures, organic salts, and charge density wave materials. These semirelativistic electron sources are not only of interest for ultrafast electron diffraction, but also for electron energy-loss spectroscopy and as a seed for x-ray FELs. Thus far, the output energy spread (hence pulse duration) of ultrafast electron guns has been limited by the achievable electric field at the surface of the emitter, which is 10 MV/m for DC guns and 200 MV/m for RF guns. A single-cycle THz electron gun provides a unique opportunity to not only achieve GV/m surface electric fields but also with relatively low THz pulse energies, since a single-cycle transform-limited waveform is the most efficient way to achieve intense electric fields. Here, electron bunches of 50 fC from a flat copper photocathode are accelerated from rest to tens of eV by a microjoule THz pulse with peak electric field of 72 MV/m at 1 kHz repetition rate. We show that scaling to the readily-available GV/m THz field regime would translate to monoenergetic electron beams of ~100 keV.
description: 16 pages, 4 figures
title: L'expression orale, la décentration et la participation des élèves au coeur des ateliers philosophiques
title: L'expression orale, la décentration et la participation des élèves au coeur des ateliers philosophiques
titleType: AlternativeTitle
Creators: name: Rexha, Leonora
name: Santos, Veronica
Publisher: name: Unknown
Year: 0
Subjects: subject: Philosophie
subject: penser
subject: ensemble
subject: expression orale
subject: décentration
subject: participation

description: Est-ce possible de travailler l’expression orale, la décentration et la participation des élèves âgés de 11 à 12 ans à travers une seule activité ? Dans ce travail de Bachelor, nous tentons de répondre à trois hypothèses émises suite à la question de recherche suivante : dans quelle mesure les ateliers philosophiques favorisent-ils le développement des élèves de 8e Harmos ? Durant ce travail, nous avons mis en place plusieurs ateliers philosophiques dans une classe de 8e Harmos. Nous avons tenté de découvrir si ces ateliers avaient une incidence sur l’expression orale des élèves, s’ils leur permettaient de se décentrer et s’ils favorisaient la participation de tous les élèves. Nous avons basé notre étude sur un cadre théorique mêlant principalement deux domaines : la philosophie et l’enseignement du français. À travers cette pratique philosophique, les enfants en plein développement sont invités à ôter leur casquette d’élève et porter celle d’être pensant. Des discussions riches en lien avec la philosophie permettent de créer une communauté de recherche dans laquelle le but est de réfléchir ensemble autour d’une question. Le choix des thématiques pour le déroulement des ateliers se fait en fonction de la motivation des élèves. Cela joue un rôle important quant à la participation des enfants.
title: Pensare e vivere con Edith Stein (Roma, 18 aprile 2009). Edith Stein e lo “spirito” della filosofia
Creators: name: Manganaro , Patrizia
Publisher: name: Roma Tre-Press
Year: 2010

description: B@belonline vol. 8 Musica e Bildung. Saper suonare e imparare ad ascoltare
FoVR: Attention-based VR Streaming through Bandwidth-limited Wireless Networks
Creators: name: Yang, Songzhou
name: He, Yuan
name: Zheng, Xiaolong
Publisher: name: arXiv
Year: 2022
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: Consumer Virtual Reality (VR) has been widely used in various application areas, such as entertainment and medicine. In spite of the superb immersion experience, to enable high-quality VR on untethered mobile devices remains an extremely challenging task. The high bandwidth demands of VR streaming generally overburden a conventional wireless connection, which affects the user experience and in turn limits the usability of VR in practice. In this paper, we propose FoVR, attention-based hierarchical VR streaming through bandwidth-limited wireless networks. The design of FoVR stems from the insight that human's vision is hierarchical, so that different areas in the field of view (FoV) can be served with VR content of different qualities. By exploiting the gaze tracking capacity of the VR devices, FoVR is able to accurately predict the user's attention so that the streaming of hierarchical VR can be appropriately scheduled. In this way, FoVR significantly reduces the bandwidth cost and computing cost while keeping high quality of user experience. We implement FoVR on a commercial VR device and evaluate its performance in various scenarios. The experiment results show that FoVR reduces the bandwidth cost by 88.9% and 76.2%, respectively compared to the original VR streaming and the state-of-the-art approach.
Relaxed dispersion constraints and metamaterial effective parameters with physical meaning for all frequencies
Creators: name: Dirdal, Christopher A.
name: Bondevik, Tarjei
name: Skaar, Johannes
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Metamaterial effective parameters may exhibit freedom from typical dispersion constraints. For instance, the emergence of a magnetic response in arrays of split-ring resonators for long wavelengths cannot be attained in a passive continuous system obeying the Kramers-Kronig relations. We characterize such freedom by identifying the three possible asymptotes which effective parameters can approach when analytically continued. Apart from their dispersion freedom, we also demonstrate that the effective parameters may be redefined in such a way that they have a certain physical meaning for all frequencies. There exists several possible definitions for the effective permittivity and permeability whereby this is achieved, thereby giving several possible frequency variations for high frequencies, while nevertheless converging to the same dispersion for long wavelengths.
description: 7 pages, 7 figures
A different kind of string
Creators: name: Caselle, Michele
name: Panero, Marco
name: Pellegrini, Roberto
name: Vadacchino, Davide
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In U(1) lattice gauge theory in three spacetime dimensions, the problem of confinement can be studied analytically in a semi-classical approach, in terms of a gas of monopoles with Coulomb-like interactions. In addition, this theory can be mapped to a spin model via an exact duality transformation, which allows one to perform high-precision numerical studies of the confining potential. Taking advantage of these properties, we carried out an accurate investigation of the effective string describing the low-energy properties of flux tubes in this confining gauge theory. We found striking deviations from the expected Nambu-Goto-like behavior, and, for the first time, evidence for contributions that can be described by a term proportional to the extrinsic curvature of the effective string worldsheet. Such term is allowed by Lorentz invariance, and its presence in the infrared regime of the U(1) model was indeed predicted by Polyakov several years ago. Our results show that this term scales as expected according to Polyakov's solution, and becomes the dominant contribution to the effective string action in the continuum limit. We also demonstrate analytically that the corrections to the confining potential induced by the extrinsic curvature term can be related to the partition function of the massive perturbation of a c=1 bosonic conformal field theory. The implications of our results for SU(N) Yang-Mills theories in three and in four spacetime dimensions are discussed.
description: 1+21 pages, 2 figures; v2 (1+24 pages, 2 figures): improved the discussion in the conclusions' section, added an appendix, included new references, updated the affiliation details for one of the authors, corrected typos: version published in the journal
Synonym Detection Using Syntactic Dependency And Neural Embeddings
Creators: name: Yang, Dongqiang
name: Wang, Pikun
name: Sun, Xiaodong
name: Li, Ning
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Recent advances on the Vector Space Model have significantly improved some NLP applications such as neural machine translation and natural language generation. Although word co-occurrences in context have been widely used in counting-/predicting-based distributional models, the role of syntactic dependencies in deriving distributional semantics has not yet been thoroughly investigated. By comparing various Vector Space Models in detecting synonyms in TOEFL, we systematically study the salience of syntactic dependencies in accounting for distributional similarity. We separate syntactic dependencies into different groups according to their various grammatical roles and then use context-counting to construct their corresponding raw and SVD-compressed matrices. Moreover, using the same training hyperparameters and corpora, we study typical neural embeddings in the evaluation. We further study the effectiveness of injecting human-compiled semantic knowledge into neural embeddings on computing distributional similarity. Our results show that the syntactically conditioned contexts can interpret lexical semantics better than the unconditioned ones, whereas retrofitting neural embeddings with semantic knowledge can significantly improve synonym detection.
Macroscopicity in an optomechanical matter-wave interferometer
Creators: name: Xuereb, André
name: Ulbricht, Hendrik
name: Paternostro, Mauro
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We analyse a proposal that we have recently put forward for an interface between matter-wave and optomechanical technologies from the perspective of macroscopic quantumness. In particular, by making use of a measure of macroscopicity in quantum superpositions that is particularly well suited for continuous variables systems, we demonstrate the existence of working points for our interface at which a quantum mechanical superposition of genuinely mesoscopic states is achieved. Our proposal thus holds the potential to affirm itself as a viable atom-to-mechanics transducer of quantum coherences.
description: Accepted for publication in Optics Communications, special issue on "Macroscopic Quantumness: Theory and Applications in Optical Sciences"
A Theory of Self-Resonance After Inflation, Part 1: Adiabatic and Isocurvature Goldstone Modes
Creators: name: Hertzberg, Mark P.
name: Karouby, Johanna
name: Spitzer, William G.
name: Becerra, Juana C.
name: Li, Lanqing
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We develop a theory of self-resonance after inflation. We study a large class of models involving multiple scalar fields with an internal symmetry. For illustration, we often specialize to dimension 4 potentials, but we derive results for general potentials. This is the first part of a two part series of papers. Here in Part 1 we especially focus on the behavior of long wavelengths modes, which are found to govern most of the important physics. Since the inflaton background spontaneously breaks the time translation symmetry and the internal symmetry, we obtain Goldstone modes; these are the adiabatic and isocurvature modes. We find general conditions on the potential for when a large instability band exists for these modes at long wavelengths. For the adiabatic mode, this is determined by a sound speed derived from the time averaged potential. While for the isocurvature mode, this is determined by a speed derived from a time averaged auxiliary potential. Interestingly, we find that this instability band usually exists for one of these classes of modes, rather than both simultaneously. We focus on backgrounds that evolve radially in field space, as setup by inflation, and also mention circular orbits, as relevant to Q-balls. In Part 2 [1] we derive the central behavior from the underlying description of many particle quantum mechanics, and introduce a weak breaking of the symmetry to study corrections to particle-antiparticle production from preheating.
description: 22 pages in double column format, 7 figures. V2: Updated to version published in PRD
Voli Ascetici e Le donne del Sud non sono solo Sole (Fatte a mano).
Creators: name: Pazienza, PhD, Gianfranco Eugenio
Publisher: name: figshare
Year: 2016
Subjects: classificationCode: 470313
subject: Italian language

description: In the two e-book stories published by Letters Meridian (http://letteremeridiane.blogspot.it) Gianfranco Pazienza tells Gargano terroir with so much more effective than it could make a weighty sociological essay. "Flights Ascetic" and "Women of Gargano is not only sun" are a way of travel stories. Small travel logue describing more than a place to go, time travel, a move in the soul and the soul, the deeper the search for identity of the promontory. If there is a place that, scrutinized with the eyes, it becomes history and memory, this is the Gargano. And Patience is very able in scrutinizing and narrate with the eyes and the voice of the soul.
The two songs have participated in two separate editions of the literary competition The bush that annually takes place in Cagnano Varano. In 2012, flights Ascetic won the second place. The two songs have the valuable presentation Geppe Inserra (Journalist and author of Meridian Letters).
Superconductivity Induced by Site-Selective Arsenic Doping in Mo$_5$Si$_3$
Creators: name: Ruan, Bin-Bin
name: Sun, Jun-Nan
name: Zhou, Meng-Hu
name: Yang, Qing-Song
name: Gu, Ya-Dong
name: Chen, Gen-Fu
name: Shan, Lei
name: Ren, Zhi-An
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Arsenic doping in silicides has been much less studied compared with phosphorus. In this study, superconductivity is successfully induced by As doping in Mo$_5$Si$_3$. The superconducting transition temperature ($T_c$) reaches 7.7 K, which is higher than those in previously known W$_5$Si$_3$-type superconductors. Mo$_5$Si$_2$As is a type-II BCS superconductor with upper and lower critical fields of 6.65 T and 22.4 mT, respectively. In addition, As atoms are found to selectively take the 8$h$ sites in Mo$_5$Si$_2$As. The emergence of superconductivity is possibly due to the shift of Fermi level as a consequence of As doping, as revealed by the specific heat measurements and first-principles calculations. Our work provides not only another example of As doping, but also a practical strategy to achieve superconductivity in silicides through Fermi level engineering.
description: Supporting Information available at the corresponding DOI
MPEC 2023-R87 : 2023 RN2
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 RN2

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
title: Pensare e vivere con Edith Stein (Roma,18 aprile 2009). Il percorso intellettuale di Edith Stein
Creators: name: Forcina , Marisa
Publisher: name: Roma Tre-Press
Year: 2010

description: B@belonline vol. 8 Musica e Bildung. Saper suonare e imparare ad ascoltare
Molecular Cluster Perturbation Theory. I. Formalism
Creators: name: Byrd, Jason N.
name: Jindal, Nakul
name: Molt,, Robert W.
name: Bartlett, Rodney J.
name: Sanders, Beverly A.
name: Lotrich, Victor F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present second-order molecular cluster perturbation theory (MCPT(2)), a linear scaling methodology to calculate arbitrarily large systems with explicit calculation of individual wavefunctions in a coupled-cluster framework. This new MCPT(2) framework uses coupled-cluster perturbation theory and an expansion in terms of molecular dimer interactions to obtain molecular wavefunctions that are infinite-order in both the electronic fluctuation operator and all possible dimer (and products of dimers) interactions. The MCPT(2) framework has been implemented in the new SIA/Aces4 parallel architecture, making use of the advanced dynamic memory control and fine grained parallelism to perform very large explicit molecular cluster calculations. To illustrate the power of this method, we have computed energy shifts, lattice site dipole moments, and harmonic vibrational frequencies via explicit calculation of the bulk system for the polar and non-polar polymorphs of solid hydrogen fluoride. The explicit lattice size (without using any periodic boundary conditions) was expanded up to 1,000 HF molecules, with 32,000 basis functions and 10,000 electrons. Our obtained HF lattice site dipole moments and harmonic vibrational frequencies agree well with the existing literature.
title: Harcèlement scolaire et soutien social
title: Harcèlement scolaire et soutien social
titleType: AlternativeTitle
Creators: name: Lüthi, Coline
name: Henchoz, Mélissa Elodie
Publisher: name: Unknown
Year: 0
Subjects: subject: harcèlement
subject: violences scolaires
subject: soutien social
subject: parents
subject: enseignant

description: Par cette recherche, nous nous intéressons principalement au concept de harcèlement. Pour ce faire, nous avons questionné trois classes du canton de Vaud à propos des violences scolaires. Parmi ces dernières, nous avons interrogé les élèves sur deux grandes dimensions, à savoir, les violences physiques et les violences psychologiques. Quelle est la réalité de ces violences au sein d’une classe et lesquelles sont principalement infligées par les élèves ? Y a-t-il des situations de harcèlement, pourtant invisibles à nos yeux, dans un contexte scolaire proche ? En tant que futures enseignantes, nous souhaitions porter une réflexion sur ce sujet afin d’obtenir des données qui puissent nous rendre conscientes des réalités vécues dans nos classes et enrichir notre bagage professionnel. Subséquemment, nous voulions axer notre recherche sur une dimension plus préventive. Ainsi, au-delà des chiffres que nous avons obtenus à propos des différentes formes de violences, nous avons porté notre intérêt sur des individus faisant partie du quotidien des élèves et qui pourraient se montrer comme de potentiels facteurs d’aide contre le harcèlement aux yeux des élèves. C’est pourquoi nous nous sommes également intéressées au concept de soutien social et avons questionné ces mêmes élèves sur l’importance qu’ils accordaient au soutien de leurs parents, de leurs enseignants et de leurs pairs ainsi que la fréquence à laquelle ils le percevaient. Ceci dans le but de déterminer si des liens de corrélation existent entre nos deux variables. Est-ce que le soutien social a un rôle protecteur contre le harcèlement et est-ce que ces influences varient en fonction du genre de l’individu et selon la source du soutien social ? Voici les principales questions auxquelles nous répondons dans notre recherche.
Efficient Graph based Recommender System with Weighted Averaging of Messages
Creators: name: Ahemad, Faizan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We showcase a novel solution to a recommendation system problem where we face a perpetual soft item cold start issue. Our system aims to recommend demanded products to prospective sellers for listing in Amazon stores. These products always have only few interactions thereby giving rise to a perpetual soft item cold start situation. Modern collaborative filtering methods solve cold start using content attributes and exploit the existing implicit signals from warm start items. This approach fails in our use-case since our entire item set faces cold start issue always. Our Product Graph has over 500 Million nodes and over 5 Billion edges which makes training and inference using modern graph algorithms very compute intensive. To overcome these challenges we propose a system which reduces the dataset size and employs an improved modelling technique to reduce storage and compute without loss in performance. Particularly, we reduce our graph size using a filtering technique and then exploit this reduced product graph using Weighted Averaging of Messages over Layers (WAML) algorithm. WAML simplifies training on large graphs and improves over previous methods by reducing compute time to 1/7 of LightGCN and 1/26 of Graph Attention Network (GAT) and increasing recall$@100$ by 66% over LightGCN and 2.3x over GAT.
description: Accepted to The Second International Conference on AI-ML Systems (AIMLSystems, October 12-15, 2022)
Review of Electric Vehicle Charging Technologies, Configurations, and Architectures
Creators: name: Acharige, Sithara S. G.
name: Haque, Md Enamul
name: Arif, Mohammad Taufiqul
name: Hosseinzadeh, Nasser
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Electric Vehicles (EVs) are projected to be one of the major contributors to energy transition in the global transportation due to their rapid expansion. The EVs will play a vital role in achieving a sustainable transportation system by reducing fossil fuel dependency and greenhouse gas (GHG) emissions. However, high level of EVs integration into the distribution grid has introduced many challenges for the power grid operation, safety, and network planning due to the increase in load demand, power quality impacts and power losses. An increasing fleet of electric mobility requires the advanced charging systems to enhance charging efficiency and utility grid support. Innovative EV charging technologies are obtaining much attention in recent research studies aimed at strengthening EV adoption while providing ancillary services. Therefore, analysis of the status of EV charging technologies is significant to accelerate EV adoption with advanced control strategies to discover a remedial solution for negative grid impacts, enhance desired charging efficiency and grid support. This paper presents a comprehensive review of the current deployment of EV charging systems, international standards, charging configurations, EV battery technologies, architecture of EV charging stations, and emerging technical challenges. The charging systems require a dedicated converter topology, a control strategy and international standards for charging and grid interconnection to ensure optimum operation and enhance grid support. An overview of different charging systems in terms of onboard and off-board chargers, AC-DC and DC-DC converter topologies, and AC and DC-based charging station architectures are evaluated.
Ivodea trichocarpa Capuron
Creators: name: Rabarimanarivo, Marina N.
name: Rakotonirina, Nivo H.
name: Phillipson, Peter B.
name: Lowry Ii, Porter P.
name: Labat, Jean-Noël
name: Pignal, Marc
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Sapindales
Rutaceae
Ivodea
Ivodea trichocarpa

description: 30. Ivodea trichocarpa Capuron (Fig. 10) Adansonia, n.s., 1: 79 (1961). — Type: Madagascar, Prov.Toliara, forêt de Zombitsy, à l’E de Sakaraha, [22°40’S, 44°41’E], 600-850 m, 16.XI., fl. ♀, fr. imm., Humbert, Bégué & Capuron 29568 (holo-, P [P00048320]!; iso-, P [P00048321]!). AUTRE MATÉRIEL EXAMINÉ. — Madagascar. Prov.Toliara, Sakaraha, 22°56’S, 44°33’E, 31.VII.1963, fl. ♀, Rauh 10451 (TAN). — Forêt de Zombitsy, à l’E de Sakaraha, [22°46’S, 44°42’E], 600 m, 24-25.I.1955, fl. ♂, Service Forestier 11930 (K, P [3 parts], TEF). — Même localité, 3-5.IV.1961, fl. ♂ & ♀, Service Forestier 20233 (P [2 parts], TEF). — Même localité, 6.XI.1987, fl. ♂, Villiers & Klackenberg 4073 (P, TAN). RÉPARTITION ET ÉCOLOGIE Ivodea trichocarpa, endémique du Sud de Madagascar, se rencontre dans les forêts tropophiles de Zombitsy et aux environs de Sakaraha, sur sables siliceux de l’Isalo vers 600- 850 m d’altitude. PHÉNOLOGIE Floraison: novembre à juillet; fructification: mai à novembre. NOTES Ivodea trichocarpa se distingue des autres membres du genre par ses petites feuilles simples (sans articulation), arrondies au sommet et atténuées à la base, avec une nervation secondaire réticulée peu saillante sur les deux faces. STATUT DE CONSERVATION Connue d’une localité dans une aire protégée (Zombitsy) et des zones environnantes non protégées, avec une zone d’occurrence d’environ 44 km ² et une zone d’occupation de 40 km ², Ivodea trichocarpa est provisoirement classée « En Danger » (EN B1ab(i,ii,iii,iv)+2ab(i,ii,iii,iv)) conformément aux critères pour la Liste Rouge de l’UICN (2012). L’habitat de cette espèce est menacé par l’exploitation pour le charbon de bois et la coupe illicite, ainsi que par les feux et le pâturage.
description: Published as part of Rabarimanarivo, Marina N., Rakotonirina, Nivo H., Phillipson, Peter B., Lowry Ii, Porter P., Labat, Jean-Noël & Pignal, Marc, 2015, Révision du genre Ivodea Capuron (Rutaceae), endémique de Madagascar et de l'archipel des Comores, pp. 63-102 in Adansonia 37 (1) on page 101, DOI: 10.5252/a2015n1a6, http://zenodo.org/record/7685945
Coexisting structural disorder and robust spin-polarization in half-metallic FeMnVAl
Creators: name: Gupta, Shuvankar
name: Chakraborty, Sudip
name: Pakhira, Santanu
name: Barreteau, Celine
name: Crivello, Jean-Claude
name: Bandyopadhyay, Bilwadal
name: Greneche, Jean Marc
name: Alleno, Eric
name: Mazumdar, Chandan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Half-metallic ferromagnets (HMF) are on one of the most promising materials in the field of spintronics due to their unique band structure consisting of one spin sub-band having metallic characteristics along with another sub-band with semiconductor-like behavior. In this work, we report the synthesis of a novel quaternary Heusler alloy FeMnVAl and have studied the structural, magnetic, transport, and electronic properties complemented with first-principles calculations. Among different possible structurally ordered arrangements, the optimal structure is identified by theoretical energy minimization. The corresponding spin-polarized band structure calculations indicates the presence of a half-metallic ferromagnetic ground state. A detailed and careful investigation of the x-ray diffraction data, Mössbauer and nuclear magnetic resonance spectra suggest the presence of site-disorder between the Fe and Mn atoms in the stable ordered structure of the system. The magnetic susceptibility measurement clearly establishes a ferromagnetic-like transition below $\sim$213 K. The ${^{57}}$Fe Mössbauer spectrometry measurements suggest only the Mn-spins could be responsible for the magnetic order, which is consistent with our theoretical calculation. Surprisingly, the density-functional-theory calculations reveal that the spin-polarization value is almost immunized (92.4\% ${\rightarrow}$ 90.4\%) from the Mn-Fe structural disorder, even when nonmagnetic Fe and moment carrying Mn sites are entangled inseparably. Robustness of spin polarization and half metallicity in the studied FeMnVAl compound comprising structural disorder is thus quite interesting and could provide a new direction to investigate and understand the exact role of disorders on spin polarization in these class of materials, over the available knowledge.
description: 12 pages
title: Pensare e vivere con Edith Stein (Roma, 18 aprile 2009). Spirito, Psiche, Cultura in Edith Stein
Creators: name: Signore , Mario
Publisher: name: Roma Tre-Press
Year: 2010

description: B@belonline vol. 8 Musica e Bildung. Saper suonare e imparare ad ascoltare
Ramanujan Series for Epstein Zeta Functions
Creators: name: Zhou, Yajun
Publisher: name: arXiv
Year: 2014
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In the spirit of Ramanujan, we derive exponentially fast convergent series for Epstein zeta functions $ E^{\varGamma_0(N)}(z,s)$ on the Hecke congruence groups $ \varGamma_0(N),N\in\mathbb Z_{>0}$, where $z$ is an arbitrary point in the upper half-plane $ \mathfrak H$, and $s\in\mathbb Z_{>1}$. These Ramanujan series can be reformulated as integrations of modular forms, in the framework of Eichler integrals. Particular cases of these Eichler integrals recover part of the recent results reported by Wan and Zucker (arXiv:1410.7081v1).
description: Minor changes. An addendum to arXiv:1312.6352v4. 15 pages
title: Concernant l'enseignement de la division des nombres entiers, les pratiques des enseignants sont-elles influencées par leurs connaissances conceptuelles ?
title: Concernant l'enseignement de la division des nombres entiers, les pratiques des enseignants sont-elles influencées par leurs connaissances conceptuelles ?
titleType: AlternativeTitle
Creators: name: Lossandja, Glody
Publisher: name: Unknown
Year: 0
Subjects: subject: Division
subject: groupement
subject: partage
subject: connaissances conceptuelles
subject: influences
subject: pratiques enseignantes

description: L’enseignement d’une opération arithmétique comme la division implique des questionnements sur la compréhension du sens de cette dernière chez les élèves. Après une séquence durant laquelle j’ai pu tester l’enseignement de la division, des interrogations sur la recherche d’une conceptualisation chez les apprenants m’ont amené à effectuer cette étude. En ce sens, l’objet de ce travail de mémoire professionnel a été de déterminer si les pratiques des maitres généralistes de 6ème primaire recherchent prioritairement à établir cette compréhension, autrement dit une conceptualisation de la division chez les apprenants. Il était aussi question d’observer les influences des connaissances conceptuelles des enseignants sur leurs pratiques. Ainsi, des entretiens menés auprès de quelques instituteurs de 6ème année primaire ont permis de constater qu’il y a effectivement un lien entre les pratiques des enseignants et leurs propres connaissances conceptuelles de cette opération. Effectivement ils ne définissent pas la division comme un mode de traitement commun aux situations de partage et de groupement, alors que les auteurs dans la littérature insistent sur le fait que cette équivalence dans le traitement des problèmes de quotition et de partition représente un élément essentiel de la conceptualisation de la division. Par conséquent, pour optimiser les possibilités de compréhension conceptuelle, cette équivalence devrait être enseignée aux élèves en leur permettant de comprendre pourquoi face à ces deux situations diverses, une même procédure, à savoir la division peut être mobilisée. En somme, cette étude a permis de mettre en lumière les potentielles raisons qui justifient pourquoi les enseignants interrogés n’évoquent pas cet élément conceptuel primordial. En effet, outre les questions sur leurs pratiques, les enseignants ont répondu également à des interrogations visant à déterminer leurs propres connaissances conceptuelles de la division. Leurs réponses ont permis de déterminer dans quelles mesures leurs propres savoirs notionnels influencent leurs manières d’enseigner la division.
A Theory of Self-Resonance After Inflation, Part 2: Quantum Mechanics and Particle-Antiparticle Asymmetry
Creators: name: Hertzberg, Mark P.
name: Karouby, Johanna
name: Spitzer, William G.
name: Becerra, Juana C.
name: Li, Lanqing
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We further develop a theory of self-resonance after inflation in a large class of models involving multiple scalar fields. We concentrate on inflaton potentials that carry an internal symmetry, but also analyze weak breaking of this symmetry. This is the second part of a two part series of papers. Here in Part 2 we develop an understanding of the resonance structure from the underlying many particle quantum mechanics. We begin by a small amplitude analysis, which obtains the central resonant wave numbers, and relate it to perturbative processes. We show that the dominant resonance structure is determined by (i) the nonrelativistic scattering of many quantum particles and (ii) the application of Bose-Einstein statistics to the adiabatic and isocurvature modes, as introduced in Part 1 [1]. Other resonance structure is understood in terms of annihilations and decays. We setup Bunch-Davies vacuum initial conditions during inflation and track the evolution of modes including Hubble expansion. In the case of a complex inflaton carrying an internal U(1) symmetry, we show that when the isocurvature instability is active, the inflaton fragments into separate regions of ϕ-particles and anti-ϕ-particles. We then introduce a weak breaking of the U(1) symmetry; this can lead to baryogenesis, as shown by some of us recently [2,3]. Then using our results, we compute corrections to the particle-antiparticle asymmetry from this preheating era.
description: 22 pages in double column format, 12 figures. V2: Updated to version published in PRD
title: Das Schloss zu Breitenfurt
Creators: name: Stankov, Kristiyan
Year: 2022

description: In den 1720er Jahren begann Gregor Wilhelm Kirchner, ein bürgerlicher hoher Beamter, mit dem Bau eines fürstlichen Lustschlosses im Wienerwald. Er scheute keine Kosten und Mühen bei der Ausstattung seiner Landresidenz und engagierte einige der besten Künstler seiner Zeit. Bald nach seinem Tod begann die Vernachlässigung des sich nun im kaiserlichen Besitz befindlichen Schlosses. Die Kunstwerke und Mobilien wurden ausgelagert und gelten heute größtenteils als verschollen. Das Gebäude musste nach zahlreichen Nutzungsumwidmungen gegen Ende des 18. Jahrhunderts aufgrund des vernachlässigten Zustandes teilweise abgerissen werden. Allein die Hauskapelle blieb unversehrt und zeugt heute noch von der ehemaligen Pracht des Gesamtkomplexes. Die Arbeit rekonstruiert das Gebäude mit seinem Interieur. Weiters wurden bekannte und neuentdeckte Kunstwerke aufgespürt und genau analysiert. Bis dato unpublizierte Originalquellen machten eine kunsthistorische Auswertung des verschollenen barocken Schlosses möglich.
description: Gregor Wilhelm Kirchner was a bourgeois, who built himself a princely palace in the Vienna Woods. He started with the construction of his country residence in the 1720s and his expenses substantially exceeded his income as a senior civil servant. This led to wild rumours that shrouded his person in mystery. Kirchner engaged some of the best artists of his time to build and decorate his chateau. Soon after his death the palace, which he had bequeathed to the emperor, fell into neglect. The works of art and furnishings were relocated and nowadays are mostly lost. After numerous alterations of use, the building had to be demolished towards the end of the 18th century due to its neglected condition. Only the house chapel remained intact and today bears witness to the former splendour of the entire complex. The thesis offers a reconstruction of the building and its lavish interior. Furthermore, known and newly discovered works of art were tracked down and analysed in detail. Previously unpublished original sources made an art-historical evaluation of the lost Baroque palace possible.
The Super-Potts glass: a new disordered model for glass-forming liquids
Creators: name: Angelini, Maria Chiara
name: Biroli, Giulio
Publisher: name: arXiv
Year: 2014
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We introduce a new disordered system, the Super-Potts model, which is a more frustrated version of the Potts glass. Its elementary degrees of freedom are variables that can take M values and are coupled via pair-wise interactions. Its exact solution on a completely connected lattice demonstrates that for large enough M it belongs to the class of mean-field systems solved by a one step replica symmetry breaking Ansatz. Numerical simulations by the parallel tempering technique show that in three dimensions it displays a phenomenological behaviour similar to the one of glass-forming liquids. The Super-Potts glass is therefore the first long-sought disordered model allowing one to perform extensive and detailed studies of the Random First Order Transition in finite dimensions. We also discuss its behaviour for small values of M, which is similar to the one of spin-glasses in a field.
description: 6 pages, 3 figures
Décrypter et caractériser les processus biologiques dynamiques qui rendent compte de la pérennité des populations de Leishmania
Creators: name: GIRAUD, Émilie
name: MILON, Geneviève
Publisher: name: MTSI
Year: 2023

description: Elucidating and characterizing the dynamic biological processes that account for the sustainability of Leishmania populations To attempt resolving this issue accurately, it was necessary to anchor our experimental approaches in the observations and pioneering work of our predecessors, notably Alphonse Laveran, Louis Parrot, Edmond and Étienne Sergent. The latter, among other things, had identified as natural hosts of leishmaniasis, rodent populations with which hematophagous telmophagous sand fly populations cohabited closely. When human populations emerged in these natural ecosystems, after the sedentarization of Homo sapiens, more or less important disturbances would have led to a transition of sand fly hematophagy, from zoophilia, to zoo-anthropophilia and anthropophilia. The creation of infrastructures that allow the breeding and integration into experimental groups of both holobiont sand flies and holobiont laboratory rodents (rats, mice, hamsters, etc.) remains crucial. With such infrastructures, it becomes possible to grasp and characterize the multilateral dynamic processes – mostly clinically silent – that account for the biogenesis of tissue and/or cellular niches protecting populations of Leishmania developmental morphotypes, including those ensuring host-to-host transmission, albeit in small numbers. Décrypter et caractériser les processus biologiques dynamiques qui rendent compte de la pérennité des populations de Leishmania Pour tenter de répondre le plus rigoureusement possible à cette question, il importait d’ancrer nos approches expérimentales aux observations et aux travaux pionniers de nos prédécesseurs, parmi lesquels Alphonse Laveran, Louis Parrot, Edmond et Étienne Sergent. Ces derniers, entre autres, avaient identifié comme populations naturellement hôtes de leishmanies, des rongeurs avec lesquels cohabitaient intimement des populations de phlébotomes hématophages telmophages. Quand ont émergé les peuples d’humains au sein de tels écosystèmes naturels, à la sédentarisation d’Homo sapiens, des perturbations d’amplitude variable se seraient traduites par une transition de l’hématophagie de ces phlébotomes, de la zoophilie à la zoo-anthropophilie et à l’anthropophilie. La création d’infrastructures où élever et intégrer dans des groupes expérimentaux, d’une part des phlébotomes holobiontes et, d’autre part des rongeurs de laboratoire holobiontes (rats, souris, hamsters, etc.) reste essentielle. Grâce à de telles infrastructures, il devient possible de saisir et caractériser les processus dynamiques multilatéraux – le plus souvent cliniquement silencieux – rendant compte de la biogenèse des niches tissulaires et/ou cellulaires protégeant des populations de morphotypes de Leishmania en développement, y compris ceux assurant la transmission d’hôte à hôte, bien qu’ils soient en petit nombre.
description: MTSI, Vol. 3 No 2 (2023): MTSI-Revue
Quantifying (dis)agreement between direct detection experiments in a halo-independent way
Creators: name: Feldstein, Brian
name: Kahlhoefer, Felix
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose an improved method to study recent and near-future dark matter direct detection experiments with small numbers of observed events. Our method determines in a quantitative and halo-independent way whether the experiments point towards a consistent dark matter signal and identifies the best-fit dark matter parameters. To achieve true halo independence, we apply a recently developed method based on finding the velocity distribution that best describes a given set of data. For a quantitative global analysis we construct a likelihood function suitable for small numbers of events, which allows us to determine the best-fit particle physics properties of dark matter considering all experiments simultaneously. Based on this likelihood function we propose a new test statistic that quantifies how well the proposed model fits the data and how large the tension between different direct detection experiments is. We perform Monte Carlo simulations in order to determine the probability distribution function of this test statistic and to calculate the p-value for both the dark matter hypothesis and the background-only hypothesis.
description: 23 pages, 14 figures. v2: matches published version
Comment on "Linear stability of a rotating channel flow subjected to a static magnetic field" [Phys. Fluids 34, 054116 (2022)]
Creators: name: Priede, Jānis
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Recently, Sengupta and Ghosh [Phys. Fluids 34, 054116, (2022)] published a linear stability analysis of a pressure-driven channel flow which is subject to rotation around a spanwise axis and a uniform magnetic field applied in the same direction. Unfortunately, the formulation of the magnetohydrodynamic part of the problem contains an elementary error which makes the obtained results unphysical. The error is due to unfounded omission of the electric potential contribution in the induced electric current which, thus, does not satisfy the charge conservation.
description: 2 pages
Opinion formation models on a gradient
Creators: name: Gastner, Michael T.
name: Markou, Nikolitsa
name: Pruessner, Gunnar
name: Draief, Moez
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Statistical physicists have become interested in models of collective social behavior such as opinion formation, where individuals change their inherently preferred opinion if their friends disagree. Real preferences often depend on regional cultural differences, which we model here as a spatial gradient $g$ in the initial opinion. The gradient does not only add reality to the model. It can also reveal that opinion clusters in two dimensions are typically in the standard (i.e.\ independent) percolation universality class, thus settling a recent controversy about a non-consensus model. However, using analytical and numerical tools, we also present a model where the width of the transition between opinions scales $\propto g^{-1/4}$, not $\propto g^{-4/7}$ as in independent percolation, and the cluster size distribution is consistent with first-order percolation.
description: 12 pages, 8 figures, version accepted by PLoS ONE, online supplement added as appendix
Maximally Frobenius-destabilized vector bundles over smooth algebraic curves
Creators: name: Zhao, Yifei
Publisher: name: arXiv
Year: 2014
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14H60, 14G17

description: Vector bundles in positive characteristics have a tendency to be destabilized after pulling back by the Frobenius morphism. In this paper, we closely examine vector bundles over curves that are, in an appropriate sense, maximally destabilized by the Frobenius morphism. Then we prove that such bundles of rank 2 exist over any curve in characteristic 3, and are unique up to twisting by a line bundle. We also give an application of such bundles to the study of ample vector bundles, which is valid in all characteristics.
description: 17 pages, corrected an error in section 4
Impresa di comunità si nasce o si diventa? Analisi di un caso-studio esemplare
Creators: name: Buratti, Nicoletta
name: Albanese, Massimo
name: Sillig, Cécile
Publisher: name: Department of Economics and Business Studies, University of Genoa
Year: 2021
Subjects: Management

description: In this paper, through the Community-Based Enterprise (CBE) theory lens and referring to a single case study of an Italian SME located in a depressed rural area, we aim to investigate the concept of community enterprise in action. Following the original concept developed by Peredo and Chrisman (2006), our analysis points out an entrepreneurial posture characterized by the integration of social and economic objectives and by the ability to leverage on local resources in order to attain multifaceted benefits for a local community. It also shows some differences from the original concept. CBE theory is in fact based mainly on experiences related to communities beset by chronic privation, namely the so-called global South. Our case study offers instead evidence of the role of this kind of enterprise in the context of a developed economy facing some stresses. It also highlights that in these contexts, being a CBE may be the outcome of a process of transformation characterized by the progressive awareness of the role played for the community and the territory of reference, and that institutional legitimacy is an essential pre-requisite in order to foster long-lasting and self-reinforcing development path.