cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Geometric scaling in diffractive deep inelastic scattering
Creators: name: Marquet, C.
name: Schoeffel, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The geometric scaling property observed in the HERA data at small x, that the deep inelastic scattering (DIS) total cross-section is a function of only the variable Q^2*x^λ, has been argued to be a manifestation of the saturation regime of QCD and of the saturation scale Q^2_s(x) x^{-λ}. We show that this implies a similar scaling in the context of diffractive DIS and we observe, for several diffractive observables, that the experimental data from HERA confirm the expectations of this scaling.
description: 9 pages, 3 figures, references added, version to appear in PLB
Exploring the potential of reverse-docking for protein function prediction
Creators: name: Malatesta, Marco
name: Polverini, Eugenia
name: Percudani, Riccardo
Publisher: name: F1000 Research Limited
Year: 2019

description: Reverse docking is a powerful tool that permits to scan a set of multiple receptors with one ligand. Reverse docking is normally used to discover new protein targets using known compounds, but could be useful in principle to identify new enzymes orreceptors when the substrates or ligands are known. Key aspects of this
technique are the conditions of receptor structures determination and, as in standard docking, knowledge of the position of active sites to limit the search space. As a proof-of-principle we applied this technique to the identification of the human gene encoding 3-hydroxy-N6-trimethyllysine aldolase (HTMLA) in carnitine biosynthesis through an automated procedure of reverse docking. This procedure involves screening of the HTML compound (ligand) on the whole set of 56 human PLP-dependent enzymes (receptors) since the reaction requires pyridoxal phosphate (PLP) as cofactor. We optimize the method by simulating the identification of ligands of PLP-dependent enzymes with known specificity. Results were evaluated through comparison of binding energies and visual analysis of receptor-ligand complexes. This analysis provides a ranked list of candidates that will be tested in vitro for HTMLA activity. This procedure could have a general application to the molecular identification of enzymes involved in known metabolic reactions.
Hyperbolic Groups and Non-Compact Real Algebraic Curves
Creators: name: Natanzon, Sergey
name: Pratoussevitch, Anna
Publisher: name: arXiv
Year: 2020
Subjects: subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: Primary 30F50, 30F35, Secondary 30F60

description: In this paper we study the spaces of non-compact real algebraic curves, i.e. pairs $(P,τ)$, where $P$ is a compact Riemann surface with a finite number of holes and punctures and $τ:P\to P$ is an anti-holomorphic involution. We describe the uniformisation of non-compact real algebraic curves by Fuchsian groups. We construct the spaces of non-compact real algebraic curves and describe their connected components. We prove that any connected component is homeomorphic to a quotient of a finite-dimensional real vector space by a discrete group and determine the dimensions of these vector spaces.
description: 9 pages, 5 figures
Quantum correlations of two optical fields close to electromagnetically induced transparency
Creators: name: Sinatra, Alice
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that three-level atoms excited by two cavity modes in a $Λ$ configuration close to electromagnetically induced transparency can produce strongly squeezed bright beams or correlated beams which can be used for quantum non demolition measurements. The input intensity is the experimental "knob" for tuning the system into a squeezer or a quantum non demolition device. The quantum correlations become ideal at a critical point characterized by the appearance of a switching behavior in the mean fields intensities. Our predictions, based on a realistic fully quantum 3-level model including cavity losses and spontaneous emission, allow direct comparison with future experiments.
description: 4 pages, 5 figures
Rota-Baxter algebras and new combinatorial identities
Creators: name: Ebrahimi-Fard, Kurusch
name: Gracia-Bondia, Jose M.
name: Patras, Frederic
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: High Energy Physics - Theory (hep-th)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 05A19, 16W30

description: The word problem for an arbitrary associative Rota-Baxter algebra is solved. This leads to a noncommutative generalization of the classical Spitzer identities. Links to other combinatorial aspects, particularly of interest in physics, are indicated.
description: 8 pages, improved version
Low Temperature Structural Phase Transition in the Perovskite Ba2CaMoO6
Creators: name: Nguyen, Loi T.
name: Cava, Robert J.
name: Fry-Petit, Allyson M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ba2CaMoO6 was synthesized by solid state method. The crystal structure adopts cubic Fm-3m space group at room temperature with lattice parameters of 8.378231(5) {angstroms}. Upon cooling, Ba2CaMoO6 was determined to have a structural phase transition to tetragonal I4/m (a=5.905763(6) {angstroms} and c=8.38817(1) {angstroms}) around 200 K. The phase transition was probed structurally by synchrotron and neutron diffraction and thermodynamically by specific heat and differential scanning calorimetry measurement. This structural phase transition will deepens our understanding of the perovskite family especially the formation of perovskites that break corner sharing networks.
description: 5 figures, 3 tables
Ανάπτυξη εργαλείων για την υποβοήθηση δημοσίευσης δεδομένων με τη χρήση του πρωτοκόλλου OData και σύγκριση με άλλα πρωτόκολλα.
Creators: name: Τσιμηρίκας, Δημήτριος Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Ανοιχτά Δεδομένα
Διασυνδεδεμένα Δεδομένα
Υπηρεσία Διαδικτύου
OData
Linked Data
Web Service

description: Ο όγκος των εφαρμογών που έχει κατακλύσει το διαδίκτυο είναι τεράστιος. Εφαρμογές πρόβλεψης καιρικών φαινομένων, σεισμών, επεξεργασίας δεδομένων από διαστημικά προγράμματα καθώς και εφαρμογές πληθώρας καθημερινών ανθρωπίνων δραστηριοτήτων δημιουργούνται καθημερινά. Διάφορα λειτουργικά, πλατφόρμες, γλώσσες προγραμματισμού και πρωτόκολλα χρησιμοποιούνται για την ανάπτυξή τους. Η ανάγκη ωστόσο διεπιστημονικών προσεγγίσεων διαφόρων ζητημάτων ή και η απλή ανταλλαγή δεδομένων απαιτεί την συνεργασία και την δυνατότητα επικοινωνίας αυτών των εφαρμογών. Ωστόσο τα ποικίλα περιβάλλοντα και εργαλεία ανάπτυξης δυσχεραίνουν την επίτευξη επικοινωνίας αυτών των εφαρμογών. Την απάντηση σε αυτήν την πρόκληση δίνουν οι υπηρεσίες ιστού (web services) μέσω των οποίων διαφορετικές πλατφόρμες και προγράμματα μπορούν να επικοινωνήσουν μεταξύ τους καλώντας ένα πρόγραμμα ή διαδικασία τους μέσω ενός δικτύου ή άλλων καναλιών. Το βασικό μειονέκτημα που παρουσιάζεται με τις υπηρεσίες δικτύου είναι ότι πολλές αιτήσεις για δεδομένα δεν μπορούν να καλυφθούν από τις υπάρχουσες διαδικασίες με αποτέλεσμα να απαιτείται συνεχώς η ανάπτυξη κώδικα και προγραμμάτων για να καλυφθούν αυτές οι ανάγκες. Για την αντιμετώπιση του προβλήματος προτάθηκαν κάποια πρωτόκολλα επικοινωνίας όπως αυτό του OData. Στον απόηχο όλων αυτών των προτάσεων προστέθηκε και αυτή του Tim Berners Lee για έναν ιστό με ανοιχτά δεδομένα για όλους και όχι περιορισμένα για μερικές μόνο εφαρμογές.
description: Abstract The volume of applications that have flooded the internet is huge. Every day new applications of forecasting weather, earthquakes, data processing from space missions and human activities are being created. Various operating platforms, programming languages and protocols are used for the development. The need for interdisciplinary approaches, however, over various issues or the simple exchange of data requires the cooperation and communication capability of these applications. However the varied environments and development tools make it difficult to achieve communication between these applications. Web services give the answer to this challenge through which different platforms and programs can communicate with each other by calling a program or procedure through a network or other channels. The main disadvantage of web services is that many data requests cannot be met by existing procedures, so that requires constantly developing code and programs to meet these needs. To tackle this problem has been suggested some communication and serialisation data protocols such as this of OData. In the aftermath of all these proposals added and that of Tim Berners Lee for a web with open data for all and not limited to a few applications.
description: Σε συνεργασία με το τμήμα Λογιστικής και Χρηματοοικονομικής (Πανεπιστήμιο Μακεδονίας)
Calibrating Car-Following Models using Trajectory Data: Methodological Study
Creators: name: Kesting, Arne
name: Treiber, Martin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: The car-following behavior of individual drivers in real city traffic is studied on the basis of (publicly available) trajectory datasets recorded by a vehicle equipped with an radar sensor. By means of a nonlinear optimization procedure based on a genetic algorithm, we calibrate the Intelligent Driver Model and the Velocity Difference Model by minimizing the deviations between the observed driving dynamics and the simulated trajectory when following the same leading vehicle. The reliability and robustness of the nonlinear fits are assessed by applying different optimization criteria, i.e., different measures for the deviations between two trajectories. The obtained errors are in the range between~11% and~29% which is consistent with typical error ranges obtained in previous studies. In addition, we found that the calibrated parameter values of the Velocity Difference Model strongly depend on the optimization criterion, while the Intelligent Driver Model is more robust in this respect. By applying an explicit delay to the model input, we investigated the influence of a reaction time. Remarkably, we found a negligible influence of the reaction time indicating that drivers compensate for their reaction time by anticipation. Furthermore, the parameter sets calibrated to a certain trajectory are applied to the other trajectories allowing for model validation. The results indicate that ``intra-driver variability'' rather than ``inter-driver variability'' accounts for a large part of the calibration errors. The results are used to suggest some criteria towards a benchmarking of car-following models.
Distribution and habitability of (meta)stable brines on present-day Mars
Creators: name: Rivera-Valentín, Edgard G.
name: Chevrier, Vincent F.
name: Soto, Alejandro
name: Martínez, Germán
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Special Regions on Mars are defined as environments able to host liquid water that meets certain temperature and water activity requirements that allow known terrestrial organisms to replicate, and therefore could be habitable. Such regions would be a concern for planetary protection policies owing to the potential for forward contamination (biological contamination from Earth). Pure liquid water is unstable on the Martian surface, but brines may be present. Experimental work has shown that brines persist beyond their predicted stability region, leading to metastable liquids. Here we show that (meta)stable brines can form and persist from the equator to high latitudes on the surface of Mars for a few percent of the year for up to six consecutive hours, a broader range than previously thought. However, only the lowest eutectic solutions can form, leading to brines with temperatures of less than 225 K. Our results indicate that (meta)stable brines on the Martian surface and shallow subsurface (a few centimeters deep) are not habitable because their water activities and temperatures fall outside the known tolerances for terrestrial life. Furthermore, (meta)stable brines do not meet the Special Regions requirements, reducing the risk for forward contamination and easing threats related to the exploration of the Martian surface.
$1/f$ noise and avalanche scaling in plastic deformation
Creators: name: Laurson, Lasse
name: Alava, Mikko
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study the intermittency and noise of dislocation systems undergoing shear deformation. Simulations of a simple two-dimensional discrete dislocation dynamics model indicate that the deformation rate exhibits a power spectrum scaling of the type $1/f^α$. The noise exponent is far away from a Lorentzian, with $α\approx 1.5$. This result is directly related to the way the durations of avalanches of plastic deformation activity scale with their size.
description: 6 pages, 5 figures, submitted to Phys. Rev. E
title: Systematic review of somatic growth patterns in relation to population structure for Pacific Sardine (Sardinops sagax) along the Pacific Coast of North America
Creators: name: Erisman, Brad
name: Craig, Matthew
name: James, Kelsey
name: Schwartzkopf, Brittany
name: Dorval, Emmanis
Publisher: name: NOAA National Marine Fisheries Service Southwest Fisheries Science Center
publisherIdentifier: https://ror.org/022d75229
publisherIdentifierScheme: ROR
Year: 2025

description: NOAA technical memorandum NMFS-SWFSC ; 708
Estimating Experimental Dispersion Curves from Steady-State Frequency Response Measurements
Creators: name: Malladi, V. V. N. Sriram
name: Albakri, Mohammad I.
name: Krishnan, Manu
name: Gugercin, Serkan
name: Tarazaga, Pablo A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Systems and Control (eess.SY)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Dispersion curves characterize the frequency dependence of the phase and the group velocities of propagating elastic waves. Many analytical and numerical techniques produce dispersion curves from physics-based models. However, it is often challenging to accurately model engineering structures with intricate geometric features and inhomogeneous material properties. For such cases, this paper proposes a novel method to estimate group velocities from experimental data-driven models. Experimental frequency response functions (FRFs) are used to develop data-driven models, {which are then used to estimate dispersion curves}. The advantages of this approach over other traditionally used transient techniques stem from the need to conduct only steady-state experiments. In comparison, transient experiments often need a higher-sampling rate for wave-propagation applications and are more susceptible to noise. The vector-fitting (VF) algorithm is adopted to develop data-driven models from experimental in-plane and out-of-plane FRFs of a one-dimensional structure. The quality of the corresponding data-driven estimates is evaluated using an analytical Timoshenko beam as a baseline. The data-driven model (using the out-of-plane FRFs) estimates the anti-symmetric ($A_0$) group velocity with a maximum error of $4\%$ over a 40~kHz frequency band. In contrast, group velocities estimated from transient experiments resulted in a maximum error of $6\%$ over the same frequency band.
Transversity and Collins functions from SIDIS and e+e- data
Creators: name: Anselmino, M.
name: Boglione, M.
name: D'Alesio, U.
name: Kotzinian, A.
name: Murgia, F.
name: Prokudin, A.
name: Turk, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A global analysis of the experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), from the HERMES and COMPASS Collaborations, and in e+e- --> h1 h2 X processes, from the BELLE Collaboration, is performed. It results in the extraction of the Collins fragmentation function and, for the first time, of the transversity distribution function for u and d quarks. These turn out to have opposite signs and to be sizably smaller than their positivity bounds. Predictions for the azimuthal asymmetry A_{UT}^{sin(phi_h + phi_S)}, as will soon be measured at JLab and COMPASS operating on a transversely polarized proton target, are then presented.
description: Revised version to appear in Phys. Rev. D. Few misprints corrected, new figures
Deep XMM and Chandra observations of ClJ1226.9+3332: A detailed X-ray mass analysis of a z=0.89 galaxy cluster
Creators: name: Maughan, B. J.
name: Jones, C.
name: Jones, L. R.
name: Van Speybroeck, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Deep XMM and Chandra observations of ClJ1226.9+3332 at z=0.89 have enabled the most detailed X-ray mass analysis of any such high-redshift galaxy cluster. The XMM temperature profile of the system shows no sign of central cooling, with a hot core and a radially declining profile. A temperature map shows asymmetry with a hot region that appears to be associated with a subclump of galaxies at the cluster redshift, but is not visible in the X-ray surface brightness. This is likely to be result of a merger event in the cluster, but does not appear to significantly affect the overall temperature profile. The XMM temperature profile, and combined Chandra and XMM emissivity profile allowed precise measurements of the global properties of ClJ1226.9+3332; we find kT=10.4+/-0.6keV, Z=0.16+/-0.05\Zsol, and M=5.2^{+1.0}_{-0.8}x10^{14}Msol. We obtain profiles of the metallicity, entropy, cooling time and gas fraction, and find a high concentration parameter for the total density profile of the system. The global properties are compared with the local LT and MT relations, and we are able to make the first observational test of the predicted evolution of the YM relation. We find that departures from these scaling relations are most likely caused by an underestimate of the total mass by ~30% in the X-ray hydrostatic mass analysis due to the apparent recent or ongoing merger activity.
description: 14 pages, 19 figures. To be submitted to ApJ
Ab initio study of the atomic motion in liquid metal surfaces: comparison with Lennard-Jones systems
Creators: name: Gonzalez, Luis E.
name: Gonzalez, David J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: It is established that liquid metals exhibit surface layering at the liquid-vapor interface, while dielectric simple systems, like those interacting through Lennard-Jones potentials, show a monotonic decay from the liquid density to that of the vapor. First principles molecular dynamics simulations of the liquid-vapor interface of several liquid metals (Li, Na, K, Rb, Cs, Mg, Ba, Al, Tl and Si), and the Na$_3$K$_7$ alloy near their triple points have been performed in order to study the atomic motion at the interface, mainly at the outer layer. Comparison with results of classical molecular dynamics simulations of a Lennard-Jones system shows interesting differences and similarities. The probability distribution function of the time of residence in a layer shows a peak at very short times and a long lasting tail. The mean residence time in a layer increases when approaching the interfacial region, slightly in the Lennard-Jones system, but strongly in the metallic systems. The motion within the layers, parallel to the interface, can be described as diffusion enhanced (strongly, in the case of the outermost layer) with respect to the bulk, for both types of systems, despite its reduced dimensionality in metals.
description: 6 pages, 5 figures. Submitted to J. Chem. Phys
$\mathcal{N}=1$ Supergravity with LQG methods and quantization of the SUSY constraint
Creators: name: Eder, Konstantin
name: Sahlmann, Hanno
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, the classical and quantum theory of $\mathcal{N}=1$ supergravity in four spacetime dimensions will be studied in the framework of loop quantum gravity. We discuss the canonical analysis of the supergravity Holst action as first introduced by Tsuda. In this way, we also derive a compact expression of the supersymmetry constraint, which plays a crucial role in canonical supergravity theories, akin to the role of the Hamiltonian constraint in non-supersymmetric generally covariant theories. The resulting theory is then quantized using loop quantum gravity methods. In particular, we propose and discuss a quantization of the supersymmetry constraint and derive explicit expressions of the action of the resulting operator. This is important as it is the first step on the way of analyzing the Dirac algebra generated by supersymmetry and Hamiltonian constraint in the quantum theory and for finding physical states. We also discuss some qualitative properties of such solutions of the SUSY constraint.
description: 41 pages, 3 figures
Semi-tractability of optimal stopping problems via a weighted stochastic mesh algorithm
Creators: name: Belomestny, Denis
name: Kaledin, Maxim
name: Schoenmakers, John G. M.
Publisher: name: Weierstrass Institute
Year: 2019
Subjects: subject: Optimal stopping
subject: American options
subject: Monte Carlo algorithms
subject: complexity
subject: 65C05
subject: 60H35
subject: 62P05

description: In this article we propose a Weighted Stochastic Mesh (WSM) algorithm for approximating the value of discrete and continuous time optimal stopping problems. It is shown that in the discrete time case the WSM algorithm leads to semi-tractability of the corresponding optimal stopping problem in the sense that its complexity is bounded in order by $varepsilon^-4log^d+2(1/varepsilon)$ with $d$ being the dimension of the underlying Markov chain. Furthermore we study the WSM approach in the context of continuous time optimal stopping problems and derive the corresponding complexity bounds. Although we can not prove semi-tractability in this case, our bounds turn out to be the tightest ones among the complexity bounds known in the literature. We illustrate our theoretical findings by a numerical example.
A critical incidents study of mentoring relationships between youth workers and adolescents
Creators: name: Peters, Dale
Publisher: name: University of British Columbia
Year: 2009

description: This study looked at the initiation and facilitation of significant, mentoring relationships between adults and adolescents. Research in the areas of mentoring and social support systems has tended to focus on outcomes of those relationships. This study primarily focused on the process of these relationships, i.e.: what actually occurred in them. In-depth interviews were conducted with seventeen participant- observers, ranging in age from 16 to 31 who had experienced a significant, mentoring relationship. The critical incidents technique was used to identify the behaviors of the adults that facilitated and strengthened the relationships. A total of 373 incidents were collected and distilled into six main categories of behaviors through an emergent method of thematic analysis. The behaviors were then listed and described. The domains, in order of prominence, emerged as follows: Behaviors that enhanced self-esteem; Communication and interpersonal skills ; Initiating, contacting and maintenance behaviors; Teaching, advising and guiding behaviors; Behaviors that modeled values, attitudes and life skills. Implications for the development of skill-training programs, counselling practice and future research have been suggested.
Versatile Configuration and Control Framework for Real Time Data Acquisition Systems
Creators: name: Karcher, Nick
name: Gebauer, Richard
name: Bauknecht, Robin
name: Illichmann, Rainer
name: Sander, Oliver
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Modern physics experiments often utilize FPGA-based systems for real-time data acquisition. Integrated analog electronics demand for complex calibration routines. Furthermore, versatile configuration and control of the whole system is a key requirement. Beside low-level register interface to the FPGA, also access to I$^2$C and SPI buses is often needed to configure the complete system. Calibration through an FPGA is inflexible and yields a complex hardware implementation. On the contrary, calibration through a remote system is possible but considerably slower due to repetitive network accesses. By using SoC-FPGA solutions with a microprocessor, more sophisticated configuration and calibration solutions, as well as standard remote access protocols, can be efficiently integrated in software. Based on Xilinx Zynq US+ SoC-FPGAs, we implemented a versatile control framework. This software framework offers a convenient access to the hardware and a flexible abstraction via remote-procedure calls (RPCs). Based on the open source RPC library gRPC, functionality with low-latent control flow, complex algorithms, data conversions and processing, as well as configuration via external buses can be provided to a client via Ethernet. Furthermore, client interfaces for various programming languages can be generated automatically which eases collaboration among different working groups and integration into existing software. This contribution presents the framework as well as benchmarks regarding latency and data throughput.
description: IEEE Real Time Conference 2020
Dark matter from late decays and the small-scale structure problems
Creators: name: Borzumati, Francesca
name: Bringmann, Torsten
name: Ullio, Piero
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The generation of dark matter in late decays of quasi-stable massive particles has been proposed as a viable framework to address the excess of power found in numerical N-body simulations for cold dark matter cosmologies. We identify a convenient set of variables to illustrate which requirements need to be satisfied in any generic particle physics model to address the small scale problems and to fulfill other astrophysical constraints. As a result of this model-independent analysis, we point out that meeting these requirements in a completely natural way is inherently difficult. In particular, we re-examine the role of gravitinos and Kaluza-Klein gravitons in this context and find them disfavoured as a solution to the small-scale problems in case they are DM candidates generated in the decay of thermally produced WIMPs. We propose right-handed sneutrinos and right-handed Kaluza-Klein neutrinos as alternatives. We find that they are viable dark matter candidates, but that they can contribute to a solution of the small scale problems only in case the associated Dirac neutrino mass term appears as a subdominant contribution in the neutrino mass matrix.
description: Small changes, matches the published version
Εργασιακό περιβάλλον, εξισορρόπηση εργασιακής – οικογενειακής ζωής και στάσεις των εργαζομένων:
Creators: name: Γαβριηλίδου, Ζωή Συμεών
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Σύγκρουση εργασιακής – οικογενειακής ζωής
Κουλτούρα συμφιλίωσης εργασίας - οικογένειας
Υποστηρικτικό προς την οικογένεια περιβάλλον εργασίας
Work – Family Conflict
Work – Family Culture
Family – Supportive Work Environment

description: Σκοπός της παρούσας εργασίας είναι η διαμόρφωση ενός θεωρητικού πλαισίου για τη διερεύνηση της σχέσης μεταξύ μιας υποστηρικτικής προς την οικογένεια εργασιακής κουλτούρας με τη σύγκρουση εργασιακής – οικογενειακής ζωής (WFC), την σύγκρουση οικογενειακής – εργασιακής ζωής και τις στάσεις των εργαζομένων (ικανοποίηση από την εργασία, ικανοποίηση από την οικογένεια και ικανοποίηση από τη ζωή συνολικά). Τα δεδομένα συλλέχθηκαν μέσω μια έρευνας με ερωτηματολόγια από 106 εργαζόμενους σε ιδιωτικές επιχειρήσεις στην Ελλάδα. Τα αποτελέσματα της έρευνας επιβεβαίωσαν ότι υπάρχει αρνητική συσχέτιση μεταξύ της οργανωσιακής κουλτούρας που είναι φιλική προς την οικογένεια με τη σύγκρουση εργασιακής – οικογενειακής ζωής. Δηλαδή, όσο περισσότερο η κουλτούρα ενός οργανισμού υποστηρίζει τις οικογενειακές ανάγκες των εργαζομένων της τόσο μειώνεται η σύγκρουση μεταξύ της εργασιακής και της οικογενειακής ζωής των εργαζομένων. Αυτή η μείωση της εργασιακής – οικογενειακής σύγκρουσης οδηγεί με τη σειρά της σε αύξηση της εργασιακής ικανοποίησης και τελικά σε αύξηση της ικανοποίησης από τη ζωή συνολικά καθώς οι δύο αυτές μεταβλητές έχουν θετική συσχέτιση μεταξύ τους. Οι σχέσεις αυτές, από την άλλη, δεν επιβεβαιώθηκαν για την σύγκρουση οικογενειακής – εργασιακής ζωής που είναι η δεύτερη κατεύθυνση της μεταβλητής WFC. Τέλος, παρουσιάζεται η συμβολή της παρούσας μελέτης και γίνονται προτάσεις για μελλοντική έρευνα
description: The purpose of the present study is to create a theoretical framework related to work – family culture, and its relationships to work– family conflict (WFC), family – work conflict (FWC), job satisfaction, family satisfaction and life satisfaction in general. Data were collected through a questionnaire survey from 106 employees in Greece. The results indicate that Work-Family Culture was negatively related to Work-Family Conflict and Work – Family Conflict was negatively related to job satisfaction. Job Satisfaction and Life Satisfaction had a positive relationship. Finally, the implications for practice and future research are discussed.
Local spiral structure based on the Gaia EDR3 parallaxes
Creators: name: Xu, Y.
name: Hou, L. G.
name: Bian, S. B.
name: Hao, C. J.
name: Liu, D. J.
name: Li, J. J.
name: Li, Y. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Context. The astrometric satellite Gaia is expected to significantly increase our knowledge as to the properties of the Milky Way. The Gaia Early Data Release 3 (Gaia EDR3) provides the most precise parallaxes for many OB stars, which can be used to delineate the Galactic spiral structure. Aims. We investigate the local spiral structure with the largest sample of spectroscopically confirmed young OB stars available to date, and we compare it with what was traced by the parallax measurements of masers. Methods. A sample consisting of three different groups of massive young stars, including O-B2 stars, O-B0 stars and O-type stars with parallax accuracies better than 10% was compiled and used in our analysis. Results. The local spiral structures in all four Galactic quadrants within $\approx$5 kpc of the Sun are clearly delineated in detail. The revealed Galactic spiral pattern outlines a clear sketch of nearby spiral arms, especially in the third and fourth quadrants where the maser parallax data are still absent. These O-type stars densify and extend the spiral structure constructed by using the Very Long Baseline Interferometry (VLBI) maser data alone. The clumped distribution of O-type stars also indicates that the Galaxy spiral structure is inhomogeneous.
description: Accepted for publication in Astronomy & Astrophysics; 4 pages, 3 figures
Structure of exotic nuclei around double shell closures
Creators: name: Covello, A.
name: Coraggio, L.
name: Gargano, A.
name: Itaco, N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In this paper, we first give a brief review of the theoretical framework for microscopic shell-model calculations starting from the free nucleon-nucleon potential. In this context, we discuss the use of the low-momentum nucleon-nucleon interaction V-low-k in the derivation of the shell-model effective interaction and emphasize its practical value as an alternative to the Brueckner G-matrix method. Then, we present some results of our current study of exotic nuclei around doubly magic 132Sn, which have been obtained starting from the CD-Bonn potential renormalized by use of the V-low-k approach. Attention is focused on the nuclei 134Te, 134Sn, and 136Te, in particular on the latter which is a direct source of information on the proton-neutron effective interaction in the 132Sn region. Comparison shows that our results are in very good agreement with the available experimental data.
description: 8 pages, 3 figures, to be published in Prog. Part. Nucl. Phys
High Frequency Asymptotics for Wavelet-Based Tests for Gaussianity and Isotropy on the Torus
Creators: name: Baldi, Paolo
name: Kerkyacharian, Gérard
name: Marinucci, Domenico
name: Picard, Dominique
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62E20, 62G20, 60F05

description: We prove a CLT for skewness and kurtosis of the wavelets coefficients of a stationary field on the torus. The results are in the framework of the fixed-domain asymptotics, i.e. we refer to observations of a single field which is sampled at higher and higher frequencies. We consider also studentized statistics for the case of an unknown correlation structure. The results are motivated by the analysis of cosmological data or high-frequency financial data sets, with a particular interest towards testing for Gaussianity and isotropy
description: 33 pages, 3 figures
Light-switchable propulsion of active particles with reversible interactions
Creators: name: Vutukuri, Hanumantha Rao
name: Lisicki, Maciej
name: Lauga, Eric
name: Vermant, Jan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Biological Physics (physics.bio-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Active systems such as microorganisms and self-propelled particles show a plethora of collective phenomena, including swarming, clustering, and phase separation. Control over the propulsion direction and switchability of the interactions between the individual self-propelled units may open new avenues in designing of materials from within. Here, we present a self-propelled particle system, consisting of half-gold coated titania ($\mathrm{TiO}_2$) particles, in which we can fast and on-demand reverse the propulsion direction, by exploiting the different photocatalytic activities on both sides. We demonstrate that the reversal in propulsion direction changes the nature of the hydrodynamic interaction from attractive to repulsive and can drive the particle assemblies to undergo both fusion and fission transitions. Moreover, we show these active colloids can act as nucleation sites, and switch rapidly the interactions between active and passive particles, leading to reconfigurable assembly and disassembly. Our experiments are qualitatively described by a minimal hydrodynamic model.
description: 28 pages, 4 figures
Distribution free goodness-of-fit tests for linear processes
Creators: name: Delgado, Miguel A.
name: Hidalgo, Javier
name: Velasco, Carlos
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62G10, 62M10 (Primary) 62F17, 62M15 (Secondary)

description: This article proposes a class of goodness-of-fit tests for the autocorrelation function of a time series process, including those exhibiting long-range dependence. Test statistics for composite hypotheses are functionals of a (approximated) martingale transformation of the Bartlett $T_p$-process with estimated parameters, which converges in distribution to the standard Brownian motion under the null hypothesis. We discuss tests of different natures such as omnibus, directional and Portmanteau-type tests. A Monte Carlo study illustrates the performance of the different tests in practice.
description: Published at http://dx.doi.org/10.1214/009053605000000606 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Algebraic vortex liquid theory of a quantum antiferromagnet on the kagome lattice
Creators: name: Ryu, S.
name: Motrunich, O. I.
name: Alicea, J.
name: Fisher, Matthew P. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: There is growing evidence from both experiment and numerical studies that low half-odd integer quantum spins on a kagome lattice with predominant antiferromagnetic near neighbor interactions do not order magnetically or break lattice symmetries even at temperatures much lower than the exchange interaction strength. Moreover, there appear to be a plethora of low energy excitations, predominantly singlets but also spin carrying, which suggest that the putative underlying quantum spin liquid is a gapless ``critical spin liquid'' rather than a gapped spin liquid with topological order. Here, we develop an effective field theory approach for the spin-1/2 Heisenberg model with easy-plane anisotropy on the kagome lattice. By employing a vortex duality transformation, followed by a fermionization and flux-smearing, we obtain access to a gapless yet stable critical spin liquid phase, which is described by (2+1)-dimensional quantum electrodynamics (QED$_3$) with an emergent $\mathrm{SU}(8)$ flavor symmetry. The specific heat, thermal conductivity, and dynamical structure factor are extracted from the effective field theory, and contrasted with other theoretical approaches to the kagome antiferromagnet.
description: 14 pages, 8 figures
Η πολιτική κοινωνικοποίηση στη Δευτεροβάθμια εκπαίδευση: Εμπειρική προσέγγιση:
Creators: name: Παπαοικονόμου, Αντώνιος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Πολιτική κοινωνικοποίηση
Δευτεροβάθμια εκπαίδευση
Μαθητές/ τριες
Political socialization
Secondary education
Students

description: Η εργασία αυτή παρουσιάζει μια έρευνα που πραγματοποιήθηκε σε μια τάξη της Β’ Λυκείου σχετικά με την πολιτική κοινωνικοποίηση των μαθητών. Χρησιμοποιήθηκε η ποιοτική προσέγγιση της ανάλυσης λόγου σύμφωνα με τη θεωρία των ErnestoLaclauκαι ChantalleMouffe. Η συζήτηση είναι δομημένη πάνω σε τρεις άξονες: ο πρώτος άξονας αφορά την αποτύπωση της επίδρασης των ομάδων συνομήλικων και των δραστηριοτήτων τους τον ελεύθερο χρόνο τους, ο δεύτερος ήταν συνδεδεμένος με τις προσωπικές απόψεις των μαθητών για θέματα που άπτονται της καθημερινότητας τους και ο τρίτος άξονας αφορά την επίδραση του σχολείου στη διαμόρφωση των πολιτικών στάσεων των μαθητών. Τα συμπεράσματα που ακολουθούν προβάλλουν εύγλωττα τις αγκυλώσεις του εκπαιδευτικού συστήματος όσον αφορά τις μαθητικές κοινότητες και τη διδασκαλία της Πολιτικής Παιδείας, αναζητώντας παράλληλα και τρόπους επίλυσης των προβλημάτων.
description: This thesis presents a research that records secondary education pupils’ points of view regarding political socialization. The discourse analysis method as it was presented by Ernesto Laclau and ChantalleMouffe was used. The discussion is based on three levels: the first level is concerned with the presentation of the influence of peer groups and their activities in free time, the second is connected with pupils’ personal points of view about issues that are related with their everyday life and the third is related with school influence on modifying pupils’ political attitudes. The conclusions that follow put forward the distortions of educational system as student councils and teaching of civic education are concerned, searching simultaneously solutions to the problems.
Probing Interstellar Grain Growth Through Polarimetry in the Taurus Cloud Complex
Creators: name: Vaillancourt, John E.
name: Andersson, B-G
name: Clemens, Dan P.
name: Piirola, Vilppu
name: Hoang, Thiem
name: Becklin, Eric E.
name: Caputo, Miranda
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The optical and near-infrared (OIR) polarization of starlight is typically understood to arise from the dichroic extinction of that light by dust grains whose axes are aligned with respect to a local magnetic-field. The size distribution of the aligned-grain population can be constrained by measurements of the wavelength dependence of the polarization. The leading physical model for producing the alignment is radiative alignment-torques (RAT), which predicts that the most efficiently aligned grains are those with sizes larger than the wavelengths of light composing the local radiation field. Therefore, for a given grain-size distribution, the wavelength at which the polarization reaches a maximum ($λ_\mathrm{max}$) should correlate with the characteristic reddening along the line of sight between the dust grains and the illumination source. A correlation between $λ_\mathrm{max}$ and reddening has been previously established for extinctions up to $A_V\approx4$ mag. We extend the study of this relationship to a larger sample of stars in the Taurus cloud complex, including extinctions $A_V>10$ mag. We confirm the earlier results for $A_V<4$ mag, but find that the $λ_\mathrm{max}$ vs. $A_V$ relationship bifurcates above $A_V\approx4$ mag, with part of the sample continuing the previously observed relationship and the remaining part exhibiting a significantly steeper rise. We propose that the data exhibiting the steep rise represent lines-of-sight towards high density "clumps," where grain coagulation has taken place. We present RAT-based modeling supporting these hypotheses. These results indicate that multi-band OIR polarimetry is a powerful tool for tracing grain growth in molecular clouds, independent of uncertainties in the dust temperature and emissivity.
description: 25 pages, 7 figures, to be published in ApJ
Statistical advances and challenges for analyzing correlated high dimensional SNP data in genomic study for complex diseases
Creators: name: Liang, Yulan
name: Kelemen, Arpad
Publisher: name: arXiv
Year: 2008
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Recent advances of information technology in biomedical sciences and other applied areas have created numerous large diverse data sets with a high dimensional feature space, which provide us a tremendous amount of information and new opportunities for improving the quality of human life. Meanwhile, great challenges are also created driven by the continuous arrival of new data that requires researchers to convert these raw data into scientific knowledge in order to benefit from it. Association studies of complex diseases using SNP data have become more and more popular in biomedical research in recent years. In this paper, we present a review of recent statistical advances and challenges for analyzing correlated high dimensional SNP data in genomic association studies for complex diseases. The review includes both general feature reduction approaches for high dimensional correlated data and more specific approaches for SNPs data, which include unsupervised haplotype mapping, tag SNP selection, and supervised SNPs selection using statistical testing/scoring, statistical modeling and machine learning methods with an emphasis on how to identify interacting loci.
description: Published in at http://dx.doi.org/10.1214/07-SS026 the Statistics Surveys (http://www.i-journals.org/ss/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Dynamics of vortex matter in rotating two-species Bose-Einstein condensates
Creators: name: Woo, S. J.
name: Choi, S.
name: Baksmaty, L. O.
name: Bigelow, N. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: In a rotating two-component Bose-Einstein condensate (BEC), the traditional triangular vortex lattice can be replaced by a rectangular vortex lattice or even a structure characterized in terms of vortex sheets, depending on the interspecies interactions. We study the dynamics of this system by analyzing the Bogoliubov excitation spectrum. Excitations familiar to BEC vortex systems are found such as Tkachenko modes, hydrodynamic modes and surface waves, however, the complex two-component morphology also gives rise to new phenomena including shear flow between vortex sheets.
Helicity in the Large-Scale Galactic Magnetic Field
Creators: name: West, J. L.
name: Henriksen, R. N.
name: Ferrière, K.
name: Woodfinden, A.
name: Jaffe, T.
name: Gaensler, B. M.
name: Irwin, J. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We search for observational signatures of magnetic helicity in data from all-sky radio polarization surveys of the Milky Way Galaxy. Such a detection would help confirm the dynamo origin of the field and may provide new observational constraints for its shape. We compare our observational results to simulated observations for both a simple helical field, and for a more complex field that comes from a solution to the dynamo equation. Our simulated observations show that the large-scale helicity of a magnetic field is reflected in the large-scale structure of the fractional polarization derived from the observed synchrotron radiation and Faraday depth of the diffuse Galactic synchrotron emission. Comparing the models with the observations provides evidence for the presence of a quadrupolar magnetic field with a vertical component that is pointing away from the observer in both hemispheres of the Milky Way Galaxy. Since there is no reason to believe that the Galactic magnetic field is unusual when compared to other galaxies, this result provides further support for the dynamo origin of large-scale magnetic fields in galaxies.
description: 17 pages, 11 figures, Accepted to MNRAS 28 September 2020
Combined Chiral Dynamics and MIT Bag Model Study of Strong Σ^{(*)}_Q \to Λ_QπDecays
Creators: name: Hwang, Chien-Wen
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The strong decays of the heavy baryons Σ^{(*)}_Q \to Λ_Q πare studied by combining the chiral dynamics and the MIT bag model. In charm sector, we calculate the decay widths Γ(Σ^{(*)}_c\to Λ_cπ) and compare with the experimental data and other theoretical estimations. In addition, we also predict the strong decay widths Γ(Σ^{(*)}_b\to Λ_bπ).
description: 15 pages, 1 figure, typos corrected, references added. Accepted for pubblication in Eur. Phys. J. C