cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Morphology, crystal structure and interfacial strain state in low dimensional III-N nanostructures
Creators: name: Κουκουλά, Τριανταφυλλιά Ευαγγέλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Νανοδομές
Νιτρίδια
Ηλεκτρονική μικροσκοπία διέλευσης
Nanostructures
Nitrides
Transmission electron microscopy

description: Η βελτιστοποίηση της απόδοσης οπτοηλεκτρονικών διατάξεων μπορεί να επιτευχτεί με τη χρήση χαμηλοδιάστατων νανοδομών όπως κβαντικά φρέατα (quantum wells/QW) νανοκολώνες (nanowires, nanorods/NW, NR) και κβαντικές τελείες (quantum dots/QD). Στα ανωτέρω συστήματα αποφεύγεται η διάχυση φορέων, λόγω του χωρικού τους περιορισμού, προς τις εξαρμόσεις και επιτυγχάνεται ο κβαντισμός των ενεργειακών ζωνών. Στο πλαίσιο της παρούσας εργασίας πραγματοποιήθηκε μια ολοκληρωμένη μελέτη της μορφολογίας, των ατελειών δομής και της κατάστασης παραμόρφωσης διεπιφανειών χαμηλοδιάστατων νανοδομών ημιαγωγών ΙΙΙ-Ν, με τη βοήθεια τεχνικών ηλεκτρονικής μικροσκοπίας διέλευσης (TEM) συνδυασμένων με αναλυτικές και ποσοτικές μεθόδους TEM. Ιδιαίτερη έμφαση δόθηκε στο σύστημα νιτριδίου του Γαλλίου και νιτριδίων Ινδίου-Γαλλίου (GaN/InGaN) στα οποία συχνά παρατηρούνται φαινόμενα ενδοδιάχυσης και συσσωμάτωσης του Ινδίου, λόγω της μεγάλης διαφοράς στις βέλτιστες θερμοκρασίες ανάπτυξης και τις πλεγματικές σταθερές των δύο υλικών, που επηρεάζουν τη κρυσταλλική δομή τους.
description: Low dimensional III-Nitride (AlN, GaN, InN and their ternary alloys) systems, i.e. quantum wells (QWs), quantum dots (QDs) and nanorods (NRs), enhance carrier confinement and hence result in improved optoelectronic properties. In the present thesis, an integrated analysis of the morphology, crystal defects and interfacial strain state of low dimensional III-N nanostructures is presented, based on transmission electron microscopy (TEM) techniques along with analytical and quantitative TEM methods. The main challenge in the growth of Indium Gallium Nitride and Gallium Nitride (InGaN/GaN) heterostructures is the large difference in the growth temperatures of the two materials since InGaN decomposition occurs at the optimum temperature for GaN growth. An additional parameter hindering efficient growth is the phase separation occurring in thick films with a high In content. The structural properties of the low dimensional systems were correlated with their growth conditions and the optimum parameters for successful growth of nanostructures with enhanced optoelectronic properties were identified.
description: Σε συνεργασία με το Ινστιτούτο Τεχνολογίας Γκρενόμπλ (Γαλλία), το ΕΚΕΦΕ Δημόκριτος, και το CNRS (Centre National de la Researche Scientifique, Γαλλία)
Are the Old Days Gone? A Survey on Actual Software Engineering Processes in Video Game Industry
Creators: name: Politowski, Cristiano
name: Fontoura, Lisandra
name: Petrillo, Fabio
name: Guéhéneuc, Yann-Gaël
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: In the past 10 years, several researches studied video game development process who proposed approaches to improve the way how games are developed. These approaches usually adopt agile methodologies because of claims that traditional practices and the waterfall process are gone. However, are the "old days" really gone in the game industry? In this paper, we present a survey of software engineering processes in video game industry from postmortem project analyses. We analyzed 20 postmortems from Gamasutra Portal. We extracted their processes and modelled them through using the Business Process Model and Notation (BPMN). This work presents three main contributions. First, a postmortem analysis methodology to identify and extract project processes. Second, the study main result: \textbf{the "old days" are gone, but not completely}. \textbf{Iterative practices} are increasing and are applied to at least \textbf{65\% of projects} in which \textbf{45\% of this projects} explicitly adopted Agile practices. However, \textbf{waterfall} process is still applied at least \textbf{30\% of projects}. Finally, we discuss some implications, directions and opportunities for video game development community.
Mesoscopic entanglement of noninteracting qubits using collective spontaneous emission
Creators: name: Kielpinski, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We describe an experimentally straightforward method for preparing an entangled W state of up to 100 qubits. Our repeat-until-success protocol relies on detection of single photons from collective spontaneous emission in free space. Our method allows entanglement preparation in a wide range of qubit implementations that lack entangling qubit-qubit interactions. We give detailed numerical examples for entanglement of neutral atoms in optical lattices and of nitrogen-vacancy centres in diamond. The simplicity of our method should enable preparation of mesoscopic entangled states in a number of physical systems in the near future.
description: replaced; corrected per referee comments
Post--Sphaleron Baryogenesis
Creators: name: Babu, K. S.
name: Mohapatra, R. N.
name: Nasri, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a new mechanism for generating the baryon asymmetry of the universe directly in the decay of a singlet scalar field $S_r$ with a weak scale mass and a high dimensional baryon number violating coupling. Unlike most currently popular models, this mechanism, which becomes effective after the electroweak phase transition, does not rely on the sphalerons for inducing a nonzero baryon number. CP asymmetry in $S_r$ decay arises through loop diagrams involving the exchange of $W^\pm$ gauge bosons, and is suppressed by light quark masses, leading naturally to a value of $η_B \sim 10^{-10}$. We show that the simplest realization of this mechanism, which uses a six quark $ΔB=2$ operator, predicts colored scalars accessible to the LHC, and neutron--antineutron oscillation within reach of the next generation experiments.
description: 13 pages, 4 figures, typos corrected, references and acknowledgment added
Partitioning the Galactic Halo with Gaussian Mixture Models
Creators: name: Liang, Xilong
name: Chen, Yuqin
name: Zhao, Jingkun
name: Zhao, Gang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Galactic halo is supposed to form from merging with nearby dwarf galaxies. In order to probe different components of the Galactic halo, we have applied the Gaussian Mixture Models method to a selected sample of metal poor stars with [Fe/H] $< -0.7$ dex in the APOGEE DR16 catalogue based on four-parameters, metallicity, [Mg/Fe] ratio and spatial velocity (\textit{$V_R$, $V_ϕ$}). Nine groups are identified with four from the halo (group 1, 3, 4 and 5), one from the thick disk (group 6), one from the thin disk (group 8) and one from dwarf galaxies (group 7) by analyzing their distributions in the ([M/H], [Mg/Fe]), ($V_R$, $V_ϕ$), (\textit{Zmax}, \textit{eccentricity}), (\textit{Energy}, \textit{Lz}) and ([Mg/Mn], [Al/Fe]) coordinates. The rest two groups are respectively caused by observational effect (group 9) and the cross section component (group 2) between the thin disk and the thick disk. It is found that in the extremely outer accreted halo (group 1), stars born in the Milky Way can not be distinguished from those accreted from other galaxies either chemically or kinematically. In the intermediate metallicity of $-$1.6 $
description: 19pages,9 figures
Computing Nearly Singular Solutions Using Pseudo-Spectral Methods
Creators: name: Hou, Thomas Y.
name: Li, Ruo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65M70, 65N35, 65T50

description: In this paper, we investigate the performance of pseudo-spectral methods in computing nearly singular solutions of fluid dynamics equations. We consider two different ways of removing the aliasing errors in a pseudo-spectral method. The first one is the traditional 2/3 dealiasing rule. The second one is a high (36th) order Fourier smoothing which keeps a significant portion of the Fourier modes beyond the 2/3 cut-off point in the Fourier spectrum for the 2/3 dealiasing method. Both the 1D Burgers equation and the 3D incompressible Euler equations are considered. We demonstrate that the pseudo-spectral method with the high order Fourier smoothing gives a much better performance than the pseudo-spectral method with the 2/3 dealiasing rule. Moreover, we show that the high order Fourier smoothing method captures about $12 \sim 15%$ more effective Fourier modes in each dimension than the 2/3 dealiasing method. For the 3D Euler equations, the gain in the effective Fourier codes for the high order Fourier smoothing method can be as large as 20% over the 2/3 dealiasing method. Another interesting observation is that the error produced by the high order Fourier smoothing method is highly localized near the region where the solution is most singular, while the 2/3 dealiasing method tends to produce oscillations in the entire domain. The high order Fourier smoothing method is also found be very stable dynamically. No high frequency instability has been observed.
description: 26 pages, 23 figures
title: Cebolleta :
title: Directrices para la ejecución del examen de la distinción, la homogeneidad y la estabilidad.
titleType: Subtitle
Creators: name: International Union For The Protection Of New Varieties Of Plants,
Publisher: name: International Union for the Protection of New Varieties of Plants,
Year: 0
Subjects: Welsh Onion
Group identity.
New Varieties of Plants

description: La finalidad de estas directrices (“directrices de examen”) es elaborar los principios que figuran en la Introducción General (documento TG/1/3) y sus documentos TGP conexos, con objeto de que sirvan de orientación práctica y detallada para el examen armonizado de la distinción, homogeneidad y estabilidad (DHE) y en particular, para identificar los caracteres apropiados para el examen DHE y producir descripciones armonizadas de variedades.
Η κίνηση στην ελληνική γλυπτική του 20ου αιώνα:
Creators: name: Μαρινίδου, Βαρβάρα Μηνά
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Μοντέρνα τέχνη
Γλυπτική
Κίνηση
Modern art
Sculpture
Kinetic

description: Η παρούσα εργασία διερευνά την παρουσία της κινητικής γλυπτικής στην ελληνική τέχνη του 20ου αιώνα και κυρίως στις δεκαετίες του `50 και έπειτα. Αποτελείται από δύο μέρη. Στο α` μέρος παρουσιάζεται το διεθνές σκηνικό της κινητικής τέχνης, οι πρώτες προσπάθειες καθώς και οι βασικοί εκπρόσωποί της από τον J. Tinguely, τον N.Schoffer, τoν G. Rickey, τoν L. Lye και άλλους μέχρι την ομάδα GRAV.Στο β` μέρος γίνεται διερεύνηση της ελληνικής πραγματικότητας όσον αφορά την κινητική γλυπτική μέσα από τους βασικούς εκπροσώπους Τάκι και Γ. Ζογγολόπουλο και στη συνέχεια μέσα από την επιλογή συγκεκριμένων καλλιτεχνών και έργων.
description: This research studies the presence of kinetic sculpture in Greek art of the 20th century with particular focus in the period of 1950 leading up to today. It comprises of two parts. Part a presents the international scene of kinetic art, its first trials and main representatives from J.Tinguely, N. Schoffer, G. Rickey, L. Lye and others, to the GRAV group. Part b presents the Greek reality of kinetic sculpture through the main representatives, Takis and G.Zoggolopoulos, and consequently through the selection of particular artists and works of art.
Stochastic Discontinuous Galerkin Methods with Low--Rank Solvers for Convection Diffusion Equations
Creators: name: Çiloğlu, Pelin
name: Yücel, Hamdullah
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 35R60, 60H15, 60H35, 65N15, 65N30,

description: We investigate numerical behaviour of a convection diffusion equation with random coefficients by approximating statistical moments of the solution. Stochastic Galerkin approach, turning the original stochastic problem to a system of deterministic convection diffusion equations, is used to handle the stochastic domain in this study, whereas discontinuous Galerkin method is used to discretize spatial domain due to its local mass conservativity. A priori error estimates of the stationary problem and stability estimate of the unsteady model problem are derived in the energy norm. To address the curse of dimensionality of Stochastic Galerkin method, we take advantage of the low--rank Krylov subspace methods, which reduce both the storage requirements and the computational complexity by exploiting a Kronecker--product structure of system matrices. The efficiency of the proposed methodology is illustrated by numerical experiments on the benchmark problems.
description: 50 pages, 9 figures, 9 tables
A Twistorial Foundation for the Classical Double Copy
Creators: name: White, Chris D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The classical double copy relates exact solutions of gauge, gravity and other theories. Although widely studied, its origins and domain of applicability have remained mysterious. In this letter, we show that a particular incarnation - the Weyl double copy - can be derived using well-established ideas from twistor theory. As well as explaining where the Weyl double copy comes from, the twistor formalism also shows that it is more general than previously thought.
description: 6 pages, no figures
Cosmological black hole spin evolution by mergers and accretion
Creators: name: Berti, Emanuele
name: Volonteri, Marta
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Using recent results from numerical relativity simulations of black hole mergers, we revisit previous studies of cosmological black hole spin evolution. We show that mergers are very unlikely to yield large spins, unless alignment of the spins of the merging holes with the orbital angular momentum is very efficient. We analyze the spin evolution in three specific scenarios: (1) spin evolves only through mergers, (2) spin evolves through mergers and prolonged accretion episodes, (3) spin evolves through mergers and short-lived (chaotic) accretion episodes. We study how different diagnostics can distinguish between these evolutionary scenarios, assessing the discriminating power of gravitational-wave measurements and X-ray spectroscopy. Gravitational radiation can produce three different types of spin measurements, yielding respectively the spins of the two black holes in a binary inspiral prior to merger, the spin of the merger remnant (as encoded in the ringdown waves), and the spin of ``single'' black holes during the extreme mass-ratio inspiral (EMRI) of compact objects. The latter spin population is also accessible to iron-line measurements. We compute and compare the spin distributions relevant for these different observations. If iron-line measurements and gravitational-wave observations of EMRIs only yield dimensionless spins j=J/M^2>0.9, then prolonged accretion should be responsible for spin-up, and chaotic accretion scenarios would be very unlikely. If only a fraction of the whole population of low-redshift black holes spins rapidly, spin-alignment during binary mergers (rather than prolonged accretion) could be responsible for spin-ups.
description: 7 pages, 5 figures. Longer version including more details and new figures in response to referee's comments
Abell 2111: An Optical and Radio Study of the Richest Butcher-Oemler Cluster
Creators: name: Miller, Neal A.
name: Oegerle, William
name: Hill, John
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present an in-depth analysis of the Butcher-Oemler cluster A2111, including new optical spectroscopy plus a deep Very Large Array (VLA) radio continuum observation. These are combined with optical imaging from the Sloan Digital Sky Survey (SDSS) to assess the activity and properties of member galaxies. Prior X-ray studies have suggested A2111 is a head-on cluster merger, a dynamical state which might be connected to the high level of activity inferred from its blue fraction. We are able to directly assess this claim, using our spectroscopic data to identify 95 cluster members among 196 total galaxy spectra. These galaxy velocities do not themselves provide significant evidence for the merger interpretation, however they are consistent with it provided the system is viewed near the time of core passage and at a viewing angle >~30 degrees different from the merger axis. The SDSS data allow us to confirm the high blue fraction for A2111, f_b = 0.15 +/- 0.03 based on photometry alone and f_b = 0.23 +/- 0.03 using spectroscopic data to remove background galaxies. We are able to detect 175 optical sources from the SDSS in our VLA radio data, of which 35 have redshift information. We use the SDSS photometry to determine photometric redshifts for the remaining 140 radio-optical sources. In total we identify up to 26 cluster radio galaxies, 14 of which have spectroscopic redshifts. The optical spectroscopy and radio data reveal a substantial population of dusty starbursts within the cluster. The high blue fraction and prevalence of star formation is consistent with the hypothesis that dynamically-active clusters are associated with more active member galaxies than relaxed clusters.
description: To appear in AJ; 53 pages including 10 figures and several long tables
A Graphic Representation of States for Quantum Copying Machines
Creators: name: Felloni, Sara
name: Strini, Giuliano
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The aim of this paper is to introduce a new graphic representation of quantum states by means of a specific application: the analysis of two models of quantum copying machines. The graphic representation by diagrams of states offers a clear and detailed visualization of quantum information's flow during the unitary evolution of not too complex systems. The diagrams of states are exponentially more complex in respect to the standard representation and this clearly illustrates the discrepancy of computational power between quantum and classical systems. After a brief introductive exposure of the general theory, we present a constructive procedure to illustrate the new representation by means of concrete examples. Elementary diagrams of states for single-qubit and two-qubit systems and a simple scheme to represent entangled states are presented. Quantum copying machines as imperfect cloners of quantum states are introduced and the quantum copying machines of Griffiths and Niu and of Buzek and Hillery are analyzed, determining quantum circuits of easier interpretation. The method has indeed shown itself to be extremely successful for the representation of the involved quantum operations and it has allowed to point out the characteristic aspects of the quantum computations examined.
description: 30 pages, 22 figures
W-boson production with large transverse momentum at the LHC
Creators: name: Kidonakis, Nikolaos
name: Gonsalves, Richard J.
name: Vera, Agustin Sabio
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study W-boson production with large transverse momentum, Q_T, in pp collisions at the LHC. We calculate the complete NLO corrections and the soft-gluon NNLO corrections to the differential cross section. The NLO corrections are large but they do not reduce the scale dependence relative to LO, while the NNLO soft-gluon corrections, although small, significantly reduce the scale dependence and thus provide a more stable result.
description: 5 pages, 3 figures, presented at the XIV International Workshop on Deep Inelastic Scattering (DIS 2006), Tsukuba, Japan, April 20-24, 2006
Universality aspects of the 2d random-bond Ising and 3d Blume-Capel models
Creators: name: Fytas, N. G.
name: Theodorakis, P. E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We report on large-scale Wang-Landau Monte Carlo simulations of the critical behavior of two spin models in two- (2d) and three-dimensions (3d), namely the 2d random-bond Ising model and the pure 3d Blume-Capel model at zero crystal-field coupling. The numerical data we obtain and the relevant finite-size scaling analysis provide clear answers regarding the universality aspects of both models. In particular, for the random-bond case of the 2d Ising model the theoretically predicted strong universality's hypothesis is verified, whereas for the second-order regime of the Blume-Capel model, the expected $d=3$ Ising universality is verified. Our study is facilitated by the combined use of the Wang-Landau algorithm and the critical energy subspace scheme, indicating that the proposed scheme is able to provide accurate results on the critical behavior of complex spin systems.
description: 10 pages, 10 figures, version published in Eur. Phys. J. B
Understanding the Standard Model, as a bridge to the discovery of new phenomena at the LHC
Creators: name: Mangano, Michelangelo L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I discuss the basic elements of the process that will lead to the discovery of possible new phenomena at the LHC. We review the status of the tools available to model the Standard Model backgrounds, and the role that such tools can play in the discovery phase, and in the exploration of the features and parameters of such new phenomena.
description: Contribution to ``Perspectives on the LHC'', G. Kane and A. Pierce, editors
Crystallization in mass-asymmetric electron-hole bilayers
Creators: name: Ludwig, P.
name: Filinov, A.
name: Lozovik, Yu. E.
name: Stolz, H.
name: Bonitz, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider a \textit{mass-asymmetric} electron and hole bilayer. Electron and hole Coulomb correlations and electron and hole quantum effects are treated on first princles by path integral Monte Carlo methods. For a fixed layer separation we vary the mass ratio $M$ of holes and electrons between 1 and 100 and analyze the structural changes in the system. While, for the chosen density, the electrons are in a nearly homogeneous state, the hole arrangement changes from homogeneous to localized, with increasing $M$ which is verified for both, mesoscopic bilayers in a parabolic trap and for a macroscopic system.
description: 10 pages, latex (styles files included)
The Concept of Mass in the Einstein Year
Creators: name: Okun, L. B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Various facets of the concept of mass are discussed. The masses of elementary particles and the search for higgs. The masses of hadrons. The pedagogical virus of relativistic mass.
description: 19 pages, Presented at the 12th Lomonosov conference on Elementary Particle Physics, Moscow State University, August 25-31
THE IMPORTANCE OF THE ENDOMETRIAL LAYER IN PREVENTING OF FAILURE IN VITRO FERTIZILATION
Creators: name: Abdujapparova, Naziraxon
Publisher: name: Zenodo
Year: 2024

description: In assisted reproductive technology (ART) programs, 60–70% of women fail to become pregnant after embryo transfer. Repeated implantation failure (RIF) remains a black box in daily practice due to the complicated categorization and causes of this physio-pathological dysregulation. Different causes of RIF were reported, mainly multifactorial, endometrial and idiopathic. Multifactorial RIF can be caused by maternal and paternal factors, gamete and embryo quality, infections and lifestyle changes in combination with psychological status and oxidative stress. Impaired endometrium function such as abnormal growth or loss of vascularization can account for endometrial RIF, but idiopathic RIF, caused mainly by abnormal cross-talk between the embryo and endometrium, remains the principal question and needs to be elucidated.
Non destructive testing of actively cooled plasma facing components by means of thermal transient excitation and infrared imaging
Creators: name: Mitteau, R.
name: Berrebi, S.
name: Chappuis, P.
name: Darses, Ph.
name: Dufayet, A.
name: Garampon, L.
name: Guilhem, D.
name: Lipa, M.
name: Martin, Valérie
name: Roche, H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: SATIR is a new test-bed installed at Tore Supra to perform non destructive examination of actively cooled plasma facing components. Hot and cold water flow successively in the cooling tube of the component and the surface temperature is recorded with an infrared camera. Defects are detected by a slower temperature response above unbrazed areas. The connection between temperature differences and defect sizes is the main difficulty. It is established by tests of standard defects and thermal transient calculations of defective geometries. SATIR has been in use for two years and has proved to be very valuable to test industrial components as well as prototypes.
Oxygen Abundances in Nearby Stars. Clues to the formation and evolution of the Galactic disk
Creators: name: Ramirez, I.
name: Prieto, C. Allende
name: Lambert, D. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The abundances of iron and oxygen are homogeneously determined in a sample of 523 nearby (d<150 pc) FGK disk and halo stars with metallicities in the range -1.5-0.3, we find no obvious indication of a sudden decrease (i.e., a 'knee') in the [O/Fe] vs. [Fe/H] pattern of thick-disk stars that would connect the thick and thin disk trends at a high metallicity. We conclude that Type Ia supernovae (SN Ia) did not contribute significantly to the chemical enrichment of the thick disk. [Abridged]
description: A&A, in press
Εφαρμογή της θεωρίας του αυτοκαθορισμού στο πλαίσιο αποκατάστασης τραυματισμένων από άθληση ατόμων τρίτης ηλικίας:
Creators: name: Παπαγεωργίου, Ειρήνη Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Θεωρία του αυτοκαθορισμού
Αυτορρύθμιση
Αυτόνομη κινητοποίηση
Self-determination theory
Autonomous regulation
Injury rehabilitation

description: Η θεωρία του αυτοκαθορισμού (Ryan και Deci, 2000), περιγράφει τη μετάβαση του αθλητή από τον τραυματισμό μέχρι την πλήρη αποκατάσταση κι επιστροφή στις αθλητικές δραστηριότητες. Kύριος στόχος της μελέτης είναι η διερεύνηση των διαστάσεων των Αυτόνομων και Ελεγχόμενων Κινήτρων και η σχέση τους με το βαθμό συμμόρφωσης των υπό αποκατάσταση αθλουμένων, προκειμένου τα αποτελέσματα να χρησιμεύσουν στη διαμόρφωση ενός αρτιότερου και αποτελεσματικότερου σχεδιασμού κατά την υλοποίηση των προγραμμάτων αποκατάστασης σε ηλικιωμένους που ασχολούνται με την άθληση. Το δείγμα αποτελούταν από ενενήντα-έξι συμμετέχοντες (Ν=96), άνδρες και γυναίκες που ανήκουν στην τρίτη ηλικία και έχουν υποστεί τραυματισμό κατόπιν άθλησης. Δύο εργαλεία μέτρησης χρησιμοποιήθηκαν για τις ανάγκες της έρευνας, «Συμπεριφορά των αθλουμένων» και «Κλίμακα για τη Συνεχιζόμενη Συμμετοχή στην Αποκατάσταση».Τα δεδομένα συλλέχθηκαν εντός των εγκαταστάσεων αθλητικών ομίλων και συλλόγων, αλλά και στις εξόδους των αθλητικών κέντρων. Η ανάλυση των συλλεχθέντων δεδομένων πραγματοποιήθηκε μέσα από τη χρήση του στατιστικού προγράμματος SPSS for Windows V.18 (PASW Statistics 18). Για την ανάλυση τις αξιοπιστίας των δύο δεικτών Ελεγχομένων και Αυτόνομων Κινήτρων, πραγματοποιήθηκαν έλεγχοι αξιοπιστίας Cronbach Alpha (α). Πραγματοποιήθηκε γραμμική παλινδρόμηση μεταξύ του Βαθμού Συμμόρφωσης ως εξαρτημένης μεταβλητής και των Αυτόνομων και Ελεγχόμενων Κινήτρων ως ανεξάρτητων μεταβλητών, προκειμένου να εξεταστεί η σχέση των δύο τύπων κινήτρων με τους δείκτες προόδου της αποκατάστασης. Πραγματοποιήθηκε μια σειρά από συσχετίσεις Pearson, προκειμένου να διασταυρωθεί εάν υφίσταται σχέση ανάμεσα στις τρεις διαστάσεις. Η απουσία στατιστικής συσχέτισης ανάμεσα στα κίνητρα, είτε αυτά είναι ενδογενή είτε εξωγενή, και τις μετρήσεις συμμόρφωσης των ατόμων στο πρόγραμμα επαναλήψεων των ασκήσεών τους δεν επιβεβαιώνει μια σαφή επίδραση των κινήτρων στην αποκατάσταση.
description: The aim of the present study was to assess the relationship of autonomous and controlled regulations with the level of compliance of individuals in injury rehabilitation. The sample comprised ninety-six older individuals (Ν=96), men and women, who have suffered an injury during physical activity participation. Two measurement instruments were utilized. The “Athlete Behavior” scale and the “Questionnaire for Continuing Participation in Injury Rehabilitation”. Linear regression was employed to examine the effects of autonomous and controlled regulations on level of compliance. While autonomous and controlled regulation motives were significantly related, the absence of a significant effect of motives on measures of compliance to the rehabilitation schedule did not confirm the hypothesis.
Uniform error bounds for fast calculation of approximate Voigt profiles
Creators: name: Nordebo, Sven
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: The broadband line-by-line analysis of radiative transfer in the atmosphere is extremely demanding with regard to computational resources. As a remedy, we present here the calculation of uniform error bounds for approximating the classical Voigt profile. A new "full" Voigt profile, which can be expressed as a combination of two Faddeeva evaluations, is also presented and included in the analysis. The uniform bounds can be used to rigorously determine the domains on which the Voigt profiles can be approximated by the corresponding Lorentz profiles to any desired accuracy. The bounds can furthermore be employed to make a fast and efficient estimate of the most significant lines to be included in a subband adaptive line selection strategy. By using a realistic numerical example of radiative transfer in the atmosphere, we demonstrate that these approximation approaches are able to reduce the computational time of the associated line-by-line analysis by several orders of magnitude with little loss of accuracy.
Unconventional superconducting pairing symmetry induced by phonons
Creators: name: Schnell, I.
name: Mazin, I. I.
name: Liu, Amy Y.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The possibility of non-s-wave superconductivity induced by phonons is investigated using a simple model that is inspired by Sr$_2$RuO$_4$. The model assumes a two-dimensional electronic structure, a two-dimensional spin-fluctuation spectrum, and three-dimensional electron-phonon coupling. Taken separately, each interaction favors formation of spin-singlet pairs (of s symmetry for the phonon interaction and d$_{x^2-y^2}$ symmetry for the spin interaction), but in combination, a variety of more unusual singlet and triplet states are found, depending on the interaction parameters. This may have important implications for Sr$_2$RuO$_4$, providing a plausible explanation of how the observed spin fluctuations, which clearly favor d$_{x^2-y^2}$ pairing, may still be instrumental in creating a superconducting state with a different (e.g., p-wave) symmetry. It also suggests an interpretation of the large isotope effect observed in Sr$_2$RuO$_4$. These results indicate that phonons could play a key role in establishing the order-parameter symmetry in Sr$_2$RuO$_4$, and possibly in other unconventional superconductors.
description: 6 pages, 5 figures, submitted to Phys. Rev. B
ЭКССУДАТИВНО-КАТАРАЛЬНЫЙ ДИАТЕЗ
Creators: name: Абдуллаева Гулида преподаватель техникума общественного здравоохранения  имени Бешарика Абу Али ибн Сино
Publisher: name: Zenodo
Year: 2024

description: Аномалия конституции, характеризующаяся склонностью к инфильтративно-десквамативным изменениям кожи, лимфопролиферацией, недостаточностью иммунного ответа и лабильностью водно-солевого обмена. .

Ключевые слова: Диатез, эритема, экзема, бронхиальная астма, токсикоз, гестоз, гипоксия плода, дисбактериоз кишечника
Commodity futures markets with imperfectly competitive producers
Creators: name: Thille, Henry
Publisher: name: University of British Columbia
Year: 2009

description: Commodity futures markets are often thought of as good examples of perfectly competitive markets. However, there are many commodities that are produced in concentrated industries and traded on large commodity exchanges. Nickel, aluminum, lead, zinc, tin, oil, and coffee are some examples. This thesis examines the effects of concentrated production on output and prices in these markets. The analysis includes the possibility that firms can trade futures contracts for their output and also store their output. A dynamic model is developed that examines how a duopoly could use futures trading and storage strategically to affect outcomes in subsequent periods. I examine futures trading for a perishable good and storage with no futures trading separately in order to highlight the potential stategic use of these activities on their own. I also analyse a model in which both futures trading and storage are allowed. I show that both futures positions and storage would be used strategically by the duopolists, in contrast to the results of previous work that used two-period models only. By allowing for uncertainty in the form of demand and cost shocks, the solution to the model can be used to provide some implications for correlations among industry level variables. These correlations are examined for the world lead, zinc, and copper industries. Weak support for the model is found, however, estimation of the vector auotregression implied by the model suggests the model in its present form is unable to fit the data very well.
Opinion dynamics with emergent collective memory: the impact of a long and heterogeneous news history
Creators: name: Boschi, Gioia
name: Cammarota, Chiara
name: Kühn, Reimer
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: In modern society people are being exposed to numerous information, with some of them being frequently repeated or more disruptive than others. In this paper we use a model of opinion dynamics to study how this news impact the society. In particular, our study aims to explain how the exposure of the society to certain events deeply change people's perception of the present and future. The evolution of opinions which we consider is influenced both by external information and the pressure of the society. The latter includes imitation, differentiation, homophily and its opposite, xenophobia. The combination of these ingredients gives rise to a collective memory effect, which is triggered by external information. In this paper we focus our attention on how this memory arises when the order of appearance of external news is random. We will show which characteristics a piece of news needs to have in order to be embedded in the society's memory. We will also provide an analytical way to measure how many information a society can remember when an extensive number of news items is presented. Finally we will show that, when a certain piece of news is present in the society's history, even a distorted version of it is sufficient to trigger the memory of the originally stored information.
description: 30 pages, 6 figures
Large spin corrections in ${\cal N}=4$ SYM sl(2): still a linear integral equation
Creators: name: Bombardelli, Diego
name: Fioravanti, Davide
name: Rossi, Marco
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Anomalous dimension and higher conserved charges in the $sl(2)$ sector of ${\cal N}=4$ SYM for generic spin $s$ and twist $L$ are described by using a novel kind of non-linear integral equation (NLIE). The latter can be derived under typical situations of the SYM sectors, i.e. when the scattering need not depend on the difference of the rapidities and these, in their turn, may also lie on a bounded range. Here the non-linear (finite range) integral terms, appearing in the NLIE and in the dimension formula, go to zero as $s\to \infty$. Therefore they can be neglected at least up to the $O(s^0)$ order, thus implying a linear integral equation (LIE) and a linear dimension/charge formula respectively, likewise the 'thermodynamic' (i.e. infinite spin) case. Importantly, these non-linear terms go faster than any inverse logarithm power $(\ln s)^{-n}$, $n>0$, thus extending the linearity validity.
description: Latex file, typos corrected, 2 figures, appendix, references and clarifications added
How to Stay Safe Online: A Cybersecurity Guide
Creators: name: Md Amiruddin
Publisher: name: zenodo
Year: 2023
Subjects: cybersecurity
security awareness

description: How to Stay Safe Online: A Cybersecurity Guide

In today’s digital landscape, staying safe online is essential for protecting your personal information and maintaining your privacy. Here are key practices to enhance your cybersecurity:

Use Strong, Unique Passwords: Create complex passwords that combine letters, numbers, and symbols. Avoid using the same password across multiple accounts. Consider using a password manager to keep track of them securely.

Enable Two-Factor Authentication (2FA): Adding an extra layer of security, 2FA requires not only your password but also a second piece of information, such as a text message code, to access your accounts. This helps protect your accounts even if your password is compromised.

Be Cautious with Links and Attachments: Phishing attacks often use deceptive emails to trick you into clicking harmful links or downloading malicious attachments. Always verify the source before engaging with any content that seems suspicious.

Keep Software Updated: Regularly update your operating system, browsers, and applications to patch security vulnerabilities. Enable automatic updates when possible to ensure you’re protected against the latest threat.

Monitor Your Online Presence: Regularly check your social media privacy settings and be mindful of the information you share online. Limit access to personal data to reduce the risk of identity theft.

Educate Yourself About Cyber Threats: Stay informed about the latest cybersecurity trends and threats. Understanding common risks can help you recognize potential dangers and respond appropriately.

By adopting these practices, you can significantly enhance your online safety and protect yourself from the myriad of threats present in the digital world. Cybersecurity is an ongoing effort, and being proactive is key to maintaining your security online.
Metastability in Interacting Nonlinear Stochastic Differential Equations I: From Weak Coupling to Synchronisation
Creators: name: Berglund, Nils
name: Fernandez, Bastien
name: Gentz, Barbara
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37H20, 37L60 (primary), 37G40, 60K35 (secondary)

description: We consider the dynamics of a periodic chain of N coupled overdamped particles under the influence of noise. Each particle is subjected to a bistable local potential, to a linear coupling with its nearest neighbours, and to an independent source of white noise. We show that as the coupling strength increases, the number of equilibrium points of the system changes from 3^N to 3. While for weak coupling, the system behaves like an Ising model with spin-flip dynamics, for strong coupling (of the order N^2), it synchronises, in the sense that all oscillators assume almost the same position in their respective local potential most of the time. We derive the exponential asymptotics for the transition times, and describe the most probable transition paths between synchronised states, in particular for coupling intensities below the synchronisation threshold. Our techniques involve a centre-manifold analysis of the desynchronisation bifurcation, with a precise control of the stability of bifurcating solutions, allowing us to give a detailed description of the system's potential landscape, in which the metastable behaviour is encoded.
sPlot: A Quick Introduction
Creators: name: Pivk, Muriel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: The paper advocates the use of a statistical tool dedicated to the exploration of data samples populated by several sources of events. This new technique, called sPlot, is able to unfold the contributions of the different sources to the distribution of a data sample in a given variable. The sPlot tool applies in the context of a Likelihood fit which is performed on the data sample to determine the yields of the various sources.
description: 5 pages, 2 figures, Contributed to PHYSTAT 05 - Oxford 12th - 15th September 2005
Phase of the Fermion Determinant at Nonzero Chemical Potential
Creators: name: Splittorff, K.
name: Verbaarschot, J. J. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We show that in the microscopic domain of QCD (also known as the $ε$-domain) at nonzero chemical potential the average phase factor of the fermion determinant is nonzero for $μ< m_π/2$ and is exponentially suppressed for larger values of the chemical potential. This follows from the chiral Lagrangian that describes the low-energy limit of the expectation value of the phase factor. Explicit expressions for the average phase factor are derived using a random matrix formulation of the zero momentum limit of this chiral Lagrangian.
description: 4 pages, 1 figure
Structural evolution of the elastic properties in nano-structured AlN film
Creators: name: Jimenez-Rioboo, Rafael J.
name: Brien, Valerie
name: Pigeat, Philippe
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A study of the transverse acoustic phonons on nano-structured AlN films has been carried out by using high-resolution micro-Brillouin spectroscopy. Dense films have been deposited by radio frequency (r.f.) magnetron sputtering under ultra high vacuum at room temperature. Films with different morphologies were prepared and investigated by transmission electron microscopy and Brillouin Spectroscopy (equiaxed nano-sized, nano-columnar grains and amorphous phase). Results show a dependence of the transverse modes on the nano-structure. The nano-columnar film exhibits two transversal modes as expected for the AlN w{ü}rtzite while the equiaxed nano-sized and the amorphous films only exhibit one isotropic transverse mode as expected in amorphous materials. One important result is that the sound propagation velocity in the AlN amorphous phase is higher than the one in the non-textured nano-crystalline phase. This phenomenon has, however, already been observed in ferroelectric ceramics.
Epitaxial integration of improper ferroelectric h-YMnO$_3$ thin films in heterostructures
Creators: name: Nordlander, J.
name: Rossell, M. D.
name: Campanini, M.
name: Fiebig, M.
name: Trassin, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on multiple fundamental qualitative improvements in the growth of improper ferroelectric hexagonal YMnO$_3$ (YMO) thin films and heterostructures by pulsed laser deposition (PLD). By a combination of pre-growth substrate annealing and low-energy-fluence PLD, we obtain a two-dimensional growth mode of the YMO films on yttria-stabilized zirconia (YSZ) with ultralow roughness and devoid of misoriented nanocrystalline inclusions. By inserting a sacrificial manganite layer capped with conducting indium-tin oxide between the substrate and the final film, the latter is grown in a fully lattice-relaxed mode and, thus, without any misfit dislocations while maintaining the extraordinary flatness of the films grown directly on pre-annealed YSZ. This provides a template for the fabrication of heterostructures based on hexagonal manganites as promising class of multiferroics with improper room-temperature ferroelectricity and the implementation of these into technologically relevant epitaxial metal|ferroelectric-type multilayers.
description: 13 pages, 5 figures
Monte Carlo study of the interfacial adsorption of the Blume-Capel model
Creators: name: Fytas, Nikolaos G.
name: Mainou, Argyro
name: Theodorakis, Panagiotis E.
name: Malakis, Anastasios
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We investigate the scaling of the interfacial adsorption of the two-dimensional Blume-Capel model using Monte Carlo simulations. In particular, we study the finite-size scaling behavior of the interfacial adsorption of the pure model at both its first- and second-order transition regimes, as well as at the vicinity of the tricritical point. Our analysis benefits from the currently existing quite accurate estimates of the relevant (tri)critical-point locations. In all studied cases, the numerical results verify to a level of high accuracy the expected scenarios derived from analytic free-energy scaling arguments. We also investigate the size dependence of the interfacial adsorption under the presence of quenched bond randomness at the originally first-order transition regime (disorder-induced continuous transition) and the relevant self-averaging properties of the system. For this ex-first-order regime, where strong transient effects are shown to be present, our findings support the scenario of a non-divergent scaling, similar to that found in the original second-order transition regime of the pure model.
description: 6 pages, 5 figures, version published in Phys. Rev. E. arXiv admin note: text overlap with arXiv:1610.08224