cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Some comments about emission channels of non abelian vortices
Creators: name: Santillán, Osvaldo P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: As is well established, several gauge theories admit vortices whose mean life time is very large. In some cases, this stability is a consequence of the topology of the symmetry group of the underlying theory. The main focus of the present work is, given a putative vortex, to determine if it is non abelian or not by analysis of its physical effects. The example considered here is the simplest one namely, a $SU(2)$ gauge model whose internal orientational space is described by $S^2$. Axion and gravitational emission are mainly considered. It is found that the non abelian property is basically reflected in a deviation of gravitational loop factor $γ_l$ found in \cite{vachaspati}-\cite{burden}. The axion emission instead, is not very sensitive to non abelianity, at least for this simple model. Another important discrepancy is that no point of the vortex reaches the speed of light when orientational modes are excited. In addition, the total power corresponding to each of these channels is compared, thus adapting the results of \cite{davis}-\cite{peloso} to the non abelian context. The excitations considered here are simple generalizations of rotating or spike string ansatz known in the literature \cite{ruso1}-\cite{kruczenski}. It is suggested however, that for certain type of semi-local strings whose internal moduli space is non compact, deviations due to non abelianity may be more pronounced.
description: 28 pages, no figures
Nontrivial damping of quantum many-body dynamics
Creators: name: Heitmann, Tjark
name: Richter, Jonas
name: Gemmer, Jochen
name: Steinigeweg, Robin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Understanding how the dynamics of a given quantum system with many degrees of freedom is altered by the presence of a generic perturbation is a notoriously difficult question. Recent works predict that, in the overwhelming majority of cases, the unperturbed dynamics is just damped by a simple function, e.g., exponentially as expected from Fermi's golden rule. While these predictions rely on random-matrix arguments and typicality, they can only be verified for a specific physical situation by comparing to the actual solution or measurement. Crucially, it also remains unclear how frequent and under which conditions counterexamples to the typical behavior occur. In this work, we discuss this question from the perspective of projection-operator techniques, where exponential damping of a density matrix occurs in the interaction picture but not necessarily in the Schrödinger picture. We show that a nontrivial damping in the Schrödinger picture can emerge if the dynamics in the unperturbed system possesses rich features, for instance due to the presence of strong interactions. This suggestion has consequences for the time dependence of correlation functions. We substantiate our theoretical arguments by large-scale numerical simulations of charge transport in the extended Fermi-Hubbard chain, where the nearest-neighbor interactions are treated as a perturbation to the integrable reference system.
description: 10 pages, 8 figures
Retarded field of a uniformly accelerated source in non-local scalar field theory
Creators: name: Kolář, Ivan
name: Boos, Jens
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the retarded field sourced by a uniformly accelerated particle in a non-local scalar field theory. While the presence of non-locality regularizes the field at the location of the source, we also show that Lorentz-invariant non-local field theories are particularly sensitive to the somewhat unphysical assumption of uniform acceleration, leading to logarithmic divergences on the acceleration horizon. Analytic properties of the non-local retarded Green function indicate that the divergences can be removed by placing appropriate sources on the acceleration horizon in the asymptotic past.
description: 15 pages, 5 figures, comments welcome!
Computing the Loewner driving process of random curves in the half plane
Creators: name: Kennedy, Tom
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60G18; 60K35; 30C30

description: We simulate several models of random curves in the half plane and numerically compute their stochastic driving process (as given by the Loewner equation). Our models include models whose scaling limit is the Schramm-Loewner evolution (SLE) and models for which it is not. We study several tests of whether the driving process is Brownian motion. We find that just testing the normality of the process at a fixed time is not effective at determining if the process is Brownian motion. Tests that involve the independence of the increments of Brownian motion are much more effective. We also study the zipper algorithm for numerically computing the driving function of a simple curve. We give an implementation of this algorithm which runs in a time O(N^1.35) rather than the usual O(N^2), where N is the number of points on the curve.
description: 20 pages, 4 figures. Changes to second version: added new paragraph to conclusion section; improved figures cosmetically
title: Préface
title: Noir, impair et passe…
titleType: Subtitle
Creators: name: Casta-Leca, Isabelle-Rachel
Publisher: name: Classiques Garnier
Year: 2021
Subjects: subject: Roman
subject: Genre littéraire
subject: Personnage
subject: Réécriture
subject: Fiction

description: Le grand éventail des études réunies dans cet ouvrage traduit la multiplicité des déclinaisons que peut avoir le polar contemporain et qui ne sont pas sans susciter l’intérêt d’un grand nombre de lecteurs. D’une partie à une autre, on voit se développer une sorte de pratique policière originale qui entraîne le genre à toujours plus de plasticité et d’ouverture, et permet au lecteur de cerner les différentes modalités scripturales qui contribuent au renouveau du polar contemporain.
Lo Zelus renardii (Kolenati, 1857) (Heteroptera Reduviidae): un promettente predatore della Macrohomotoma gladiata (Kuwayama, 1908) (Psylloidea Homotomidae) sui Ficus microcarpa Hort. Berol. ex Walp. (Moraceae) ornamentali del verde urbano a Bari
Creators: name: Cornara Daniele
name: Nocera Anna
name: Isabella, Corrado
name: Verrastro Vincenzo
name: Lamaj, Flutura
name: Ahmed, El Kenawy
name: Russo Valentina
name: Francesco, Porcelli
Publisher: name: Zenodo
Year: 2016

description: Macrohomotoma gladiata ha invaso i Ficus spp. di Bari a partire dall’estate 2013, infestando intensamente molte piante delle alberate cittadine. La presenza del fitomizo si manifesta con gravi deformazioni degli apici vegetativi che sono imbrattati da grandi secrezioni fioccose di cera bianca. Durante la primavera-estate del 2014 abbiamo osservato sui Ficus urbani numerosi individui di Zelus renardii predare adulti di Macrohomotoma gladiata. In tale situazione di campo circa un attacco su quattro ha avuto successo. Il predatore ci è sembrato particolarmente interessato agli adulti di M. gladiata sui rametti e sulle foglie delle piante ospiti. Cinque femmine di Zelus, allevate singolarmente in scatoline (10x10x5 cm) di metacrilato cristallino (circa 25°C, 60% UR), hanno consumato fino a 14 M. gladiata ciascuna al giorno deponendo circa venti uova ogni dieci giorni. Dalle uova sono regolarmente nati i giovani che hanno manifestato una spiccata attitudine al cannibalismo, condivisa anche dalle loro madri. Gli allevamenti sono stati sospesi dopo aver ottenuto due deposizioni da ogni femmina e aver verificato che la specie si adatta bene ai piccoli contenitori di allevamento. Questo predatore esotico accidentalmente introdotto in Italia si è ben acclimatato. Potrebbe essere facilmente allevato in massa, per essere utilizzato in programmi di controllo biologico o come componente di controllo biologico in strategie controllo integrato (IPM) anche contro insetti dannosi in ambiente urbano.
How special are Brightest Group and Cluster Galaxies?
Creators: name: von der Linden, Anja
name: Best, Philip N.
name: Kauffmann, Guinevere
name: White, Simon D. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use the Sloan Digital Sky Survey to construct a sample of 625 brightest group and cluster galaxies (BCGs) together with control samples of non-BCGs matched in stellar mass, redshift, and color. We investigate how the systematic properties of BCGs depend on stellar mass and on their privileged location near the cluster center. The groups and clusters that we study are drawn from the C4 catalogue of Miller et al. (2005) but we have developed improved algorithms for identifying the BCG and for measuring the cluster velocity dispersion. Since the SDSS photometric pipeline tends to underestimate the luminosities of large galaxies in dense environments, we have developed a correction for this effect which can be readily applied to the published catalog data. We find that BCGs are larger and have higher velocity dispersions than non-BCGs of the same stellar mass, which implies that BCGs contain a larger fraction of dark matter. In contrast to non-BCGs, the dynamical mass-to-light ratio of BCGs does not vary as a function of galaxy luminosity. Hence BCGs lie on a different fundamental plane than ordinary elliptical galaxies. BCGs also follow a steeper Faber-Jackson relation than non-BCGs, as suggested by models in which BCGs assemble via dissipationless mergers along preferentially radial orbits. We find tentative evidence that this steepening is stronger in more massive clusters. BCGs have similar mean stellar ages and metallicities to non-BCGs of the same mass, but they have somewhat higher alpha/Fe ratios, indicating that star formation may have occurred over a shorter timescale in the BCGs. Finally, we find that BCGs are more likely to host radio-loud active galactic nuclei than other galaxies of the same mass, but are less likely to host an optical AGN. The differences we find are more pronounced for the less massive BCGs.
description: Replaced with slightly modified version accepted by MNRAS. 28 pages, 25 figures. Version with full resolution figures available at http://www.mpa-garching.mpg.de/~anja/bcgs_avdl.pdf
Impactul Inteligenței Artificiale asupra Domeniului Design
Creators: name: Badescu, Sonia
Publisher: name: Zenodo
Year: 2024
Subjects: design
AI
educatie

description: Inteligența Artificială (IA) devine un factor revoluționar în diverse industrii, inclusiv în cel al designului, urmând să influențeze în mod decisiv subdomeniile acestuia, implicit designul de interior, designul grafic și designul industrial. IA nu doar că va continua sa modifice profund modul în care lucrăm și învățăm, dar va redefine esențial piața muncii și educația universitară pentru viitorii designeri.
Light Bridges Can Suppress the Formation of Coronal Loops
Creators: name: Miao, Yuhu
name: Fu, Libo
name: Du, Xian
name: Yuan, Ding
name: Jiang, Chaowei
name: Su, Jiangtao
name: Zhao, Mingyu
name: Anfinogentov, Sergey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A light bridge is a magnetic intrusion into a sunspot, it interacts with the main magnetic field and excites a variety of dynamical processes. In the letter, we studied magnetic connectivity between a light bridge and coronal loops rooted at the sunspot. We used the data of the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory (SDO) to study the features of sunspots with light bridges. It is found that if a light bridge anchors at the umbra-penumbra boundary, the coronal loops could not be formed around the anchoring point. If the a light bridge become detached from the penumbra, the coronal loop starts to form again. The vector magnetogram provided by the Helioseismic Magnetic Imager onboard SDO shows that the anchoring region of a light bridge usually have an accompanying opposite minor-polarities. We conjugate that the magnetic field line could connect to these opposite polarities and form short-range magnetic loops, and therefore, coronal loops that extend to long-range could not be formed. A model of light bridge is proposed to explain the magnetic connectivity between a light bridge and the coronal loops. This model could explain many physical processes associated with light bridges.
description: MNRAS, 5 pages,3 figures
Βιοηθικοί προβληματισμοί στη στρατιωτική ιατρική
Creators: name: Τσούσκας, Ιωάννης Λαζάρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Στρατιωτική ιατρική ηθική
Ηθικά διλήμματα
Σύγκρουση ρόλων
Military medical ethics
Ethical dilemmas
Conflict of roles

description: Η στρατιωτική βιοηθική αποτελεί ένα σχετικά ανεξερεύνητο πεδίο. Σκοπός του παρόντος πονήματος ήταν η παρουσίαση των ιδιαίτερων βιοηθικών ζητημάτων, τα οποία προβληματίζουν τον σύγχρονο Στρατιωτικό Ιατρό προκύπτουν κατά την άσκηση της ιατρικής, εντός του ιδιαίτερου πλαισίου της στρατιωτικής υπηρεσίας, στην ειρηνική περίοδο και κυρίως κατά τη διάρκεια πολεμικών επιχειρήσεων. Οι ιατροί των Ενόπλων Δυνάμεων, παρόλο που έχουν τις ίδιες ηθικές υποχρεώσεις προς τους ασθενείς τους, σε σχέση με τους πολίτες συναδέλφους τους, εντούτοις αντιμετωπίζουν συχνά έντονα ηθικά διλήμματα. Αυτό οφείλεται στις αντικρουόμενες υποχρεώσεις τους, οι οποίες απορρέουν από τη διπλή τους ιδιότητα, του ιατρού και του στρατιώτη. Ως εκ τούτου, επιχειρήθηκε επιπλέον μια ηθική θεώρηση της Στρατιωτικής Ιατρικής, ως συνδυασμού δύο φαινομενικά αντικρουόμενων ηθικών αξιακών συστημάτων και αναζητήθηκαν τρόποι, ώστε ο στρατιωτικός ιατρός να μπορεί να αντεπεξέλθει με ισορροπημένο, από ηθικής απόψεως, τρόπο στα διπλά του καθήκοντα.
description: Military medical ethics is a relatively unexplored field. The aim of this thesis was the presentation of the bioethical issues, which worry the modern military physicians, in their medical practice, within the strict military work frame, in peacetime and mainly during armed conflict. While physicians of the Armed Forces have the same ethical obligations towards their patients, as their civilian counterparts, however they often encounter intense ethical dilemmas, due to their dual role as physicians and soldiers. Hence, we attempted an additional ethical consideration of Military Medicine, as a combination of two seemingly conflicting ethical value systems. Furthermore, we tried to identify ways for military medical officers to cope with their dual duties in an ethically balanced way.
The octic E8 invariant
Creators: name: Cederwall, Martin
name: Palmkvist, Jakob
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We give an explicit expression for the primitive E8-invariant tensor with eight symmetric indices. The result is presented in a manifestly Spin(16)/Z2-covariant notation.
description: 10 pp, plain tex
On simultaneous arithmetic progressions on elliptic curves
Creators: name: Garcia-Selfa, I.
name: Tornero, J. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G05, 14H52, 11B25

description: In this paper we study elliptic curves which have a number of points whose coordinates are in arithmetic progression. We first motivate this diophantine problem, prove some results, provide a number of interesting examples and, finally point out open questions which focus on the most interesting aspects of the problem for us.
description: 22 pages
An approach to dynamics and control of flexible space structure
Creators: name: Chen, Yuan
Publisher: name: University of British Columbia
Year: 2008

description: A relatively general formulation for studying dynamics and control of a large class of systems, characterized by interconnected rigid bodies, beam and plate type structural members forming a tree topology with two levels of branching, is developed using the Lagrangian procedure. The governing equations are discretized using two fundamentally different approaches of system and component modes synthesis. Versatility of the formulation is demonstrated, through its application to two systems of contemporary interest,in the presence of nonlinear control: (i) Space station based, two-arm mobile, flexible manipulator; (ii) NASA proposed configuration involving a flexible slewing arm abode a flexible truss with a rigid antenna. Relative merit of the two discretization procedures is assessed over a range of system parameters through comparison of the controlled and uncontrolled responses. Results suggest that the component mode synthesis, though relatively easy to implement, can lead to inaccurate response unless the boundary con-ditions are modeled precisely. Unfortunately, this is seldom possible, particularly with complex systems of current interest. On the other hand, discretization through system modes, though precise, would require frequent updating leading to an increase in the computational time. The investigation represents an original contribution of far-reaching consequence to the field. Such a planned approach to assess discretization methodologies with reference to space based system has not been reported in open literature.
Magnetic bubble refraction and quasibreathers in inhomogeneous antiferromagnets
Creators: name: Speight, J. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The dynamics of magnetic bubble solitons in a two-dimensional isotropic antiferromagnetic spin lattice is studied, in the case where the exchange integral J(x,y) is position dependent. In the near continuum regime, this system is described by the relativistic O(3) sigma model on a spacetime with a spatially inhomogeneous metric, determined by J. The geodesic approximation is used to describe low energy soliton dynamics in this system: n-soliton motion is approximated by geodesic motion in the moduli space of static n-solitons, equipped with the L^2 metric. Explicit formulae for this metric for various natural choices of J(x,y) are obtained. From these it is shown that single soliton trajectories experience refraction, with 1/J analogous to the refractive index, and that this refraction effect allows the construction of simple bubble lenses and bubble guides. The case where J has a disk inhomogeneity (taking the value J_1 outside a disk, and J_2
description: Conference proceedings paper for talk given at Nonlinear Physics Theory and Experiment IV, Gallipoli, Italy, June 2006
A survey of exoplanet phase curves with Ariel
Creators: name: Charnay, Benjamin
name: Mendonça, Joao M.
name: Kreidberg, Laura
name: Cowan, Nicolas B.
name: Taylor, Jake
name: Bell, Taylor J.
name: Demangeon, Olivier
name: Edwards, Billy
name: Haswell, Carole A.
name: Morello, Giuseppe
name: Mugnai, Lorenzo V.
name: Pascale, Enzo
name: Tinetti, Giovanna
name: Tremblin, Pascal
name: Zellem, Robert T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The ESA-Ariel mission will include a tier dedicated to exoplanet phase curves corresponding to ~10% of the science time. We present here the current observing strategy for studying exoplanet phase curves with Ariel. We define science questions, requirements and a list of potential targets. We also estimate the precision of phase curve reconstruction and atmospheric retrieval using simulated phase curves. Based on this work, we found that full-orbit phase variations for 35-40 exoplanets could be observed during the 3.5-yr mission. This statistical sample would provide key constraints on atmospheric dynamics, composition, thermal structure and clouds of warm exoplanets, complementary to the scientific yield from spectroscopic transits/eclipses measurements.
description: 27 pages, 10 figures, accepted for publication in Experimental Astronomy, Ariel Special Issue
The cutting behavior of bandsaws
Creators: name: Lehmann, Bruce
Publisher: name: University of British Columbia
Year: 2008

description: A model of a bandsaw, subjected to lateral cutting forces on the teeth and restrained by the sawn surfaces of the wood, has been developed. The blade model includes the effects of blade dimensions, bandmill strain, in-plane stresses, tooth (gullet) depth, tooth bending stiffness, blade speed, strain system parameters, and the span between the guides. The lateral cutting forces along the length of the cut were found to have dominant low frequency components and are modelled by functions having spectra that are inversely proportional to the frequency. The results of the model simulation show that when there is little or no contact between the body of the blade and the sawn surfaces, the sawing accuracy is governed by the tooth-tip stiffness and the magnitude of the lateral cutting forces. When the clearance gap is small compared to the blade deflection, the contact forces dominate and poor cutting accuracy results because the blade cannot recover quickly from disturbances. The clearance gap between the blade and a sawn surface is shown to be less than the side clearance of the teeth because of sawdust spillage and surface roughness. A formula is developed that defines how blade stiffness, the clearance gap, and the cutting forces affect sawing deviation. It is found that the tooth-tip stiffness is the blade parameter that most significantly affects cutting accuracy. An example of determining the optimal side clearance and some practical implications of the results are presented.
Additional file 1 of Clinical and genetic characteristics and prenatal diagnosis of patients presented GDD/ID with rare monogenic causes
Creators: name: Lin, Liling
name: Zhang, Ying
name: Pan, Hong
name: Wang, Jingmin
name: Qi, Yu
name: Ma, Yinan
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1: Fig. S1. Flow diagram for inclusion and exclusion of studies.
UntitledGranice empatii. O napięciu związanym z badaniem biografii komunistów / The borders of empathy. On the tension inherent in the study of communist biographies - VoR
Creators: name: Krasucki, Eryk
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 430303
subject: Biography
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: The phenomenon that is communism still arouses many emotions. Especially in countries where attempts were made to put its ideas into practice, such as Poland. For this reason, the study of its history – absurd though it may seem – also generates controversy. Of no small importance for the emergence of this situation is the fact that in domestic public discourse anti-communism still plays a major role, as a handy instrument for stigmatising and disciplining political opponents, but also as a signpost for official narratives about Polish history in the 20th century. This has implications for research. Approaches to communist issues in the classical manner – sine ira et studio – are not infrequently misunderstood, most often outside the scholarly circuit, but also in the academic world. Biographies of communists are a particular example, people who are denied positive qualities and motives, and consider attempts to understand their attitudes to make little sense. The text is an authorial reflection, referring to the autoethnographic method, on biographical studies that have been going on for more than two decades and the tensions they create.
Scaling properties of granular rheology near the jamming transition
Creators: name: Hatano, Takahiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Rheological properties of a dense granular material consisting of frictionless spheres are investigated. It is found that the shear stress, the pressure, and the kinetic temperature obey critical scaling near the jamming transition point, which is considered as a critical point. These scaling laws have some peculiar properties in view of conventional critical phenomena because the exponents depend on the interparticle force models so that they are not universal. It is also found that these scaling laws imply the relation between the exponents that describe the growing correlation length.
description: v2. Some minor comments are added. v3. & v.4 Numerical accuracy is improved
Machine Learning Empowered Resource Allocation in IRS Aided MISO-NOMA Networks
Creators: name: Gao, X.
name: Liu, Y.
name: Liu, X.
name: Song, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Information Theory (cs.IT)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: A novel framework of intelligent reflecting surface (IRS)-aided multiple-input single-output (MISO) non-orthogonal multiple access (NOMA) network is proposed, where a base station (BS) serves multiple clusters with unfixed number of users in each cluster. The goal is to maximize the sum rate of all users by jointly optimizing the passive beamforming vector at the IRS, decoding order, power allocation coefficient vector and number of clusters, subject to the rate requirements of users. In order to tackle the formulated problem, a three-step approach is proposed. More particularly, a long short-term memory (LSTM) based algorithm is first adopted for predicting the mobility of users. Secondly, a K-means based Gaussian mixture model (K-GMM) algorithm is proposed for user clustering. Thirdly, a deep Q-network (DQN) based algorithm is invoked for jointly determining the phase shift matrix and power allocation policy. Simulation results are provided for demonstrating that the proposed algorithm outperforms the benchmarks, while the throughput gain of 35% can be achieved by invoking NOMA technique instead of orthogonal multiple access (OMA).
Doubly Heavy Baryons and Quark-Diquark Symmetry in Quenched and Partially Quenched Chiral Perturbation Theory
Creators: name: Mehen, Thomas
name: Tiburzi, Brian C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We extend the chiral Lagrangian with heavy quark-diquark symmetry to quenched and partially quenched theories. These theories are used to derive formulae for the chiral extrapolation of masses and hyperfine splittings of doubly heavy baryons in lattice QCD simulations. A quark-diquark symmetry prediction for the hyperfine splittings of heavy mesons and doubly heavy baryons is rather insensitive to chiral corrections in both quenched and partially quenched QCD. Extrapolation formulae for the doubly heavy baryon electromagnetic transition moments are also determined for the partially quenched theory.
description: 19pp, Ref. added
Supersymmetric Higgs and Radiative Electroweak breaking
Creators: name: Ibanez, L. E.
name: Ross, G. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review the mechanism of radiative electroweak symmetry breaking taking place in SUSY versions of the standard model. We further discuss different proposals for the origin of SUSY-breaking and the corresponding induced SUSY-breaking soft terms. Several proposals for the understanding of the little hierarchy problem are critically discussed.
description: To be published in Comptes Rendus de l'Academie des Sciences
Lexical elicitation: Weather and heavenly phenomena
Creators: name: Palacio, Frank
name: Björklund, Anna
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: cab

description: Lexical elicitation of 'rain', 'sun', 'moon', 'star', 'fog', 'dew', 'sky', 'heaven', 'cloud, 'lightning', 'thunder', 'storm.'
Σχολιασμένη διερμηνεία στο πλαίσιο της πρακτικής άσκησης, με έμφαση στις διαφορές μεταξύ της διαδοχικής και της ταυτόχρονης διερμηνείας
Creators: name: Βασιλοπούλου, Ανδριάνα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Διερμηνεία
Διαδοχική διερμηνεία
Ταυτόχρονη διερμηνεία
Interpretation
Consecutive interpretation
Simultaneous interpretation

description: Σκοπός της παρούσας μεταπτυχιακής διπλωματικής εργασίας είναι η αναλυτική περιγραφή της πρακτικής άσκησης που πραγματοποίησε η γράφουσα κατά τη διάρκεια του δεύτερου έτους των σπουδών της στο Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών Μετάφρασης και Διερμηνείας του Αριστοτελείου Πανεπιστημίου, στην κατεύθυνση Διερμηνείας. Στα επιμέρους κεφάλαια της παρούσας εργασίας περιγράφονται τα συνέδρια και οι εκδηλώσεις στις οποίες συμμετείχε η γράφουσα, παρέχονται αναλυτικές πληροφορίες σχετικά με τους ομιλητές, τις συνθήκες εργασίες και τις δυσκολίες που προέκυψαν καθώς και σχετικά με τις μεθόδους που χρησιμοποιήθηκαν για την αντιμετώπιση αυτών. Ειδική δε έμφαση δίδεται στις διαφορές μεταξύ διαδοχικής και ταυτόχρονης διερμηνείας. Τέλος εξάγονται κάποια βασικά συμπεράσματα σχετικά με την εμπειρία της πρακτικής άσκησης.
description: Aim of the present master thesis was the analytical description of the work experience placement that took place during the second year of studies in the Joint Postgraduate Studies Programme in Conference Interpreting and Translation of the Aristotle University (Interpreting course). The different chapters of this thesis contain descriptions of the conferences and events where I participated; analytical information is provided about the speakers, the working conditions and the difficulties I encountered, as well as the methods used to overcome these difficulties. Special emphasis is placed on the differences between consecutive and simultaneous interpretation. Last but not least, some basic conclusions are drawn concerning the work experience placement itself.
Φυσική Δραστηριότητα σε φοιτητές Erasmus Θεσσαλονίκης
Creators: name: Ζαφείρης, Βασίλης Θεόδωρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Φυσική δραστηριότητα
Φοιτητές
Erasmus
Physical activity
Students

description: Ο βασικός σκοπός της παρούσας έρευνας ήταν η διερεύνηση της φυσικής δραστηριότητας των φοιτητών Erasmus της Θεσσαλονίκης. Το δείγμα συνολικά αποτελούνταν από 100 άτομα φοιτητές Erasmus στην πόλη της Θεσσαλονίκης. Η διανομή των ερωτηματολογίων πραγματοποιήθηκε κατά τους μήνες Ιανουάριο, Φεβρουάριου και Μάρτιο του έτους 2020, στην αγγλική γλώσσα και η στατιστική ανάλυση των δεδομένων που συγκεντρώθηκαν πραγματοποιήθηκε με το στατιστικό πακέτο IBM SPSS Statistics version 20.0. Κατά μέσο όρο, οι φοιτητές του δείγματος είχαν 3.136,4 ± 3.505,29 METS. Βάσει των συνολικών METS, οι μισοί περίπου φοιτητές (55%) παρουσιάζουν μέτριας έντασης φυσική δραστηριότητα, το 36% παρουσιάζουν φυσική δραστηριότητα υψηλής έντασης, ενώ μόνο το 9% παρουσιάζει χαμηλής έντασης δραστηριότητα. Από τον έλεγχο συσχετίσεων, προέκυψε ότι η μοναδική στατιστικά σημαντική σχέση είναι εκείνη μεταξύ της έντασης της φυσικής δραστηριότητας και της σχολής όπου σπουδάζουν οι φοιτητές του δείγματος. Συγκεκριμένα, υψηλότερη ένταση φυσικής δραστηριότητας παρουσιάζουν ως επί το πλείστον το τμήμα νομικής, μέτρια ένταση παρουσιάζουν κυρίως οι φοιτητές του τμήματος βιολογίας, του τμήματος πολιτικών επιστημών, του τμήματος ιατρικής και του τμήματος αγγλικής γλώσσας και φιλολογίας, ενώ η χαμηλή ένταση φυσικής δραστηριότητας παρατηρήθηκε κυρίως στο τμήμα φιλολογίας.
description: The main purpose of this research was to investigate the physical activity of Erasmus students in Thessaloniki. The sample consisted of 100 Erasmus students of the city of Thessaloniki. The distribution of the questionnaires was realized during the months of January, February and March of the year 2020, in English and the statistical analysis of the collected data was carried out with the statistical package IBM SPSS Statistics version 20.0. On average, the students of the sample had 3.136,4 ± 3.505,29 METS. According to the overall METS, about half of the students (55%) present physical activity of moderate intensity, the 36% of the students have physical activity of high intensity, and only 9% present physical activity of low intensity. Correlations showed that the only statistically significant relationship was that between the intensity of the physical activity and the school of the students. Most specifically, a higher intensity of physical activity is presented for the students of law school, moderate intensity is presented by the students of the department of biology, the department of political science, the medicine school and the department of the English Language and literature, whereas the students of the department of literature presented physical activity of low intensity
Search for the decay ω→ηe+e- in η→π+π-π0 decay mode with the CMD-3 detector
Creators: name: Mishin Vyacheslav
Publisher: name: Zenodo
Year: 2019
Subjects: Conversion rare decay, Vector Dominance Model, VDM, light vector meson decay

description: A set of selection criteria has been elaborated using Monte-Carlo modeling simulation (MC) to extract the ω→ηe+e- decay events. Using a data sample of 6 pb-1 collected in 3 central points in the energy range close to ω-meson invariant mass the upper limit on the branching ratio of decay has been estimated: B(ω→ηe+e-) < 5 ∙ 10-6, which does not contradict to the Vector Dominance Model (VDM) prediction: (2.0 – 4.8) ∙ 10-6.
On the prevalence of radio-loud AGN in brightest cluster galaxies: implications for AGN heating of cooling flows
Creators: name: Best, P. N.
name: von der Linden, A.
name: Kauffmann, G.
name: Heckman, T. M.
name: Kaiser, C. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (Abridged) The prevalence of radio-loud AGN activity in present-day massive halos is determined using a sample of 625 nearby groups and clusters from the SDSS. Brightest group and cluster galaxies (BCGs) are more likely to host a radio-loud AGN than other galaxies of the same stellar mass (by less than a factor of two at a stellar mass of 5e11 M_sun, but over an order of magnitude below 1e11 M_sun). The distribution of radio luminosities for BCGs does not depend on stellar mass, however, and is similar to that of field galaxies of the same mass. Neither the radio-loud fraction nor the radio luminosity distribution of BCGs depends strongly on the cluster velocity dispersion. The radio-AGN fraction is also studied as a function of clustercentric distance: only within 0.2 r_200 do cluster galaxies exhibit an enhanced likelihood of radio-loud AGN activity, approaching that of the BCGs. The radio-loud AGN properties of both BCGs and non-BCGs can naturally be explained if this activity is fuelled by cooling from hot gas surrounding the galaxy. Using observational estimates of the mechanical output of the radio jets, the time-averaged energy output associated with recurrent radio source activity is estimated for all group/cluster galaxies. Within the cooling radius of the cluster, the radio-mode heating from the BCG dominates over that of all other galaxies combined. The scaling between total radio-AGN energy output and cluster velocity dispersion is considerably shallower than the sigma^4 scaling of the radiative cooling rate. Thus, unless either the mechanical-to-radio luminosity ratio or the efficiency of converting AGN mechanical energy into heating increases by 2-3 orders of magnitude between groups and rich clusters, radio-mode heating will not balance cooling in systems of all masses.
description: Accepted for publication in MNRAS. LaTeX, 16 pages. Pages 6,7 and 8 contain colour figures. Revised to take into account referee's comments: addition of Sec 7.2, removal of Figure 2b, and other minor changes
Trapping reactions with subdiffusive traps and particles
Creators: name: Yuste, S. B.
name: Lindenberg, Katja
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Reaction dynamics involving subdiffusive species is an interesting topic with only few known results, especially when the motion of different species is characterized by different anomalous diffusion exponents. Here we study the reaction dynamics of a (sub)diffusive particle surrounded by a sea of (sub)diffusive traps in one dimension. Under some reasonable assumptions we find rigorous results for the asymptotic survival probability of the particle in most cases, but have not succeeded in doing so for a particle that diffuses normally while the anomalous diffusion exponent of the traps is smaller than 2/3.
description: Some errata corrected
Vacuum Birefringence Caused by Arbitrary Spin Particles
Creators: name: Kruglov, S. I.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the propagation of a linearly polarized laser beam in the external transverse magnetic field taking into consideration the vacuum polarization by arbitrary spin particles. Induced ellipticity of the beam are evaluated using the effective Lagrangian. With the help of the PVLAS experimental data, we obtain bounds on masses of charged higher spin particles contributed to ellipticity.
description: 5 pages, substantial changes, shortened version matches new PVLAS data, accepted in Mod.Phys.Lett.A
A review of turbulent skin-friction drag reduction by near-wall transverse forcing
Creators: name: Ricco, Pierre
name: Skote, Martin
name: Leschziner, Michael A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The quest for reductions in fuel consumption and CO2 emissions in transport has been a powerful driving force for scientific research into methods that might underpin drag-reducing technologies for a variety of vehicular transport on roads, by rail, in the air, and on or in the water. In civil aviation, skin-friction drag accounts for around 50% of the total drag in cruise conditions, thus being a preferential target for research. With laminar conditions excluded, skin friction is intimately linked to the turbulence physics in the fluid layer closest to the skin. Thus, research into drag reduction has focused on methods to depress the turbulence activity near the surface. The most effective method of doing so is to subject the drag-producing flow in the near-wall layer to an unsteady and/or spatially varying cross-flow component, either by the action of transverse wall oscillations, by embedding rotating discs into the surface or by plasma-producing electrodes that accelerate the near-wall fluid in the transverse direction. In ideal conditions, drag-reduction margins of order of 50% can be achieved. The present article provides a review of research into the response of turbulent near-wall layers to the imposition of unsteady and wavy transverse motion, encompassing experiments, simulation, analysis and modelling. It covers issues such as the drag-reduction margin in a variety of actuation scenarios, the underlying physical phenomena that contribute to the interpretation of the origin of the drag reduction, the dependence of the drag reduction on the Reynolds number, passive control methods that are inspired by active control, and a forward look towards possible future research and practical realizations. The authors hope that this review, by far the most extensive of its kind for this subject, will be judged as a useful foundation for future research targeting friction-drag reduction
description: Typos and formatting corrected
A near-infrared spectroscopic detection of the brown dwarf in the post common envelope binary WD0137-349
Creators: name: Burleigh, M. R.
name: Hogan, E.
name: Dobbie, P. D.
name: Napiwotzki, R.
name: Maxted, P. F. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a near-infrared spectrum of the close, detached white dwarf + brown dwarf binary WD0137-349 (Maxted et al 2006), that directly reveals the substellar companion through an excess of flux longwards of 1.95 microns. We best match the data with a white dwarf + L8 composite model. For ages ~1 Gyr, the spectral type of the cool secondary is in agreement with the mass determined by Maxted et al. (2006) from radial velocity measurements (0.053 +/- 0.006Msun), and supports an evolutionary scenario in which the brown dwarf survived a previous phase of common envelope evolution which resulted in the formation of this close binary. The brown dwarf is the lowest mass companion to a white dwarf yet found, and the lowest mass object known to have survived a common envelope phase. At 1300 < T < 1400K WD0137-349B is also the coolest known companion to a white dwarf. At a separation a = 0.65Rsun the hemisphere of the brown dwarf facing the 16,500K white dwarf is being heated through irradiation. We discuss the possible effects of this additional heating, with particular relevance to those other close binaries with substellar companions, the hot Jupiters. We propose future observations to investigate the likely temperature differences between the ``day'' and ``night'' sides of the brown dwarf.
description: Accepted for publication in MNRAS
Evaluating Spectral Models and the X-ray States of Neutron-Star X-ray Transients
Creators: name: Lin, Dacheng
name: Remillard, Ronald A.
name: Homan, Jeroen
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We propose a hybrid model to fit the X-ray spectra of atoll-type X-ray transients in the soft and hard states. This model uniquely produces luminosity tracks that are proportional to T^4 for both the accretion disk and boundary layer. The model also indicates low Comptonization levels for the soft state, gaining a similarity to black holes in the relationship between Comptonization level and the strength of integrated rms variability in the power density spectrum. The boundary layer appears small, with a surface area that is roughly constant across soft and hard states. This result may suggestion that the NS radius is smaller than its inner-most stable circular orbit.
description: 15 pages, 15 figures, accepted for publication in the ApJ
Semiclassical theory of a quantum pump
Creators: name: Rahav, Saar
name: Brouwer, Piet W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In a quantum charge pump, the periodic variation of two parameters that affect the phase of the electronic wavefunction causes the flow of a direct current. The operating mechanism of a quantum pump is based on quantum interference, the phases of interfering amplitudes being modulated by the external parameters. In a ballistic quantum dot, there is a minimum time before which quantum interference can not occur: the Ehrenfest time. Here we calculate the current pumped through a ballistic quantum dot when the Ehrenfest time is comparable to the mean dwell time. Remarkably, we find that the pumped current has a component that is not suppressed if the Ehrenfest time is much larger than the mean dwell time.
description: 14 pages, 8 figures. Revised version, minor changes
Every 4-Manifold is BLF
Creators: name: Akbulut, Selman
name: Karakurt, Cagri
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 57R55, 57R65, 57R17, 57M50

description: Here we show that every compact smooth 4-manifold X has a structure of a Broken Lefschetz Fibration (BLF in short). Furthermore, if b_{2}^{+}(X)> 0 then it also has a Broken Lefschetz Pencil structure (BLP) with nonempty base locus. This imroves a Theorem of Auroux, Donaldson and Katzarkov, and our proof is topological (i.e. uses 4-dimensional handlebody theory).
description: 24 pages, 14 figures, published version
Renormalized mean-field analysis of antiferromagnetism and d-wave superconductivity in the two-dimensional Hubbard model
Creators: name: Reiss, J.
name: Rohe, D.
name: Metzner, W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We analyze the competition between antiferromagnetism and superconductivity in the two-dimensional Hubbard model by combining a functional renormalization group flow with a mean-field theory for spontaneous symmetry breaking. Effective interactions are computed by integrating out states above a scale Lambda_{MF} in one-loop approximation, which captures in particular the generation of an attraction in the d-wave Cooper channel from fluctuations in the particle-hole channel. These effective interactions are then used as an input for a mean-field treatment of the remaining low-energy states, with antiferromagnetism, singlet superconductivity and triplet pi-pairing as the possible order parameters. Antiferromagnetism and superconductivity suppress each other, leaving only a small region in parameter space where both orders can coexist with a sizable order parameter for each. Triplet pi-pairing appears generically in the coexistence region, but its feedback on the other order parameters is very small.
description: 28 pages, 14 figures
A teleparallel representation of the Weyl Lagrangian
Creators: name: Vassiliev, Dmitri
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The main result of the paper is a new representation of the Weyl Lagrangian (massless Dirac Lagrangian). As the dynamical variable we use the coframe, i.e. an orthonormal tetrad of covector fields. We write down a simple Lagrangian - wedge product of axial torsion with a lightlike element of the coframe - and show that variation of the resulting action with respect to the coframe produces the Weyl equation. The advantage of our approach is that it does not require the use of spinors, Pauli matrices or covariant differentiation. The only geometric concepts we use are those of a metric, differential form, wedge product and exterior derivative. Our result assigns a variational meaning to the tetrad representation of the Weyl equation suggested by J.B.Griffiths and R.A.Newing.
description: Submitted to the Proceedings of the Eleventh Marcel Grossmann Meeting
MPEC 2024-T79 : 2009 TF10
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

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.