cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Simultaneous X-ray/optical observations of GX 9+9 (4U 1728-16)
Creators: name: Kong, A. K. H.
name: Charles, P. A.
name: Homer, L.
name: Kuulkers, E.
name: O'Donoghue, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on the results of the first simultaneous X-ray (RXTE) and optical (SAAO) observations of the luminous low mass X-ray binary (LMXB) GX 9+9 in 1999 August. The high-speed optical photometry revealed an orbital period of 4.1958 hr and confirmed previous observations, but with greater precision. No X-ray modulation was found at the orbital period. On shorter timescales, a possible 1.4-hr variability was found in the optical light curves which might be related to the mHz quasi-periodic oscillations seen in other LMXBs. We do not find any significant X-ray/optical correlation in the light curves. In X-rays, the colour-colour diagram and hardness-intensity diagram indicate that the source shows characteristics of an atoll source in the upper banana state, with a correlation between intensity and spectral hardness. Time-resolved X-ray spectroscopy suggests that two-component spectral models give a reasonable fit to the X-ray emission. Such models consist of a blackbody component which can be interpreted as the emission from an optically thick accretion disc or an optically thick boundary layer, and a hard Comptonized component for an extended corona.
description: 19 pages, 13 figures; accepted for publication in MNRAS
Direct Numerical Simulation of the Moist Stably Stratified Surface Layer: Turbulence and Fog Formation
Creators: name: MacDonald, Michael
name: Kurowski, Marcin J.
name: Teixeira, João
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: We investigate the effects of condensation and liquid water loading on the stably stratified surface layer, with an eye towards understanding the influence of turbulent mixing on fog formation. Direct numerical simulations (DNS) of dry and moist open channel flows are conducted, where in both a constant cooling rate is applied at the ground to mimic longwave radiative cooling. Depending on the cooling rate, it can lead to either turbulent (weakly stable) or laminar (very stable) flows. Compared to the completely dry case, the condensation of liquid water in the moist case enables slightly higher cooling rates to be achieved before leading to turbulence collapse. In the very stable cases, runaway cooling leads to the substantial condensation of liquid water close to the ground and fog (visibility less than 1 km) results over much of the domain. In the weakly stable cases, turbulent mixing narrowly yields visibilities of 1 km close to the ground over a similar time period. However, despite the idealized nature of the system, the present results suggest that turbulence impedes, although will not necessarily inhibit, fog formation. A possible mechanism for fog formation within turbulent flows is identified, wherein regions of increased liquid water content form within the low-speed streaks of the near-wall cycle. These streaks are energized in the moist cases due to reduced dissipation of turbulence kinetic energy compared to the dry case, although in both cases the streaks are less energetic and persistent than in neutrally stratified flow.
description: Accepted in Boundary-Layer Meteorology
InterChat: Enhancing Generative Visual Analytics using Multimodal Interactions
Creators: name: Chen, Juntong
name: Wu, Jiang
name: Guo, Jiajing
name: Mohanty, Vikram
name: Li, Xueming
name: Ono, Jorge Piazentin
name: He, Wenbin
name: Ren, Liu
name: Liu, Dongyu
Publisher: name: arXiv
Year: 2025
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The rise of Large Language Models (LLMs) and generative visual analytics systems has transformed data-driven insights, yet significant challenges persist in accurately interpreting users' analytical and interaction intents. While language inputs offer flexibility, they often lack precision, making the expression of complex intents inefficient, error-prone, and time-intensive. To address these limitations, we investigate the design space of multimodal interactions for generative visual analytics through a literature review and pilot brainstorming sessions. Building on these insights, we introduce a highly extensible workflow that integrates multiple LLM agents for intent inference and visualization generation. We develop InterChat, a generative visual analytics system that combines direct manipulation of visual elements with natural language inputs. This integration enables precise intent communication and supports progressive, visually driven exploratory data analyses. By employing effective prompt engineering, and contextual interaction linking, alongside intuitive visualization and interaction designs, InterChat bridges the gap between user interactions and LLM-driven visualizations, enhancing both interpretability and usability. Extensive evaluations, including two usage scenarios, a user study, and expert feedback, demonstrate the effectiveness of InterChat. Results show significant improvements in the accuracy and efficiency of handling complex visual analytics tasks, highlighting the potential of multimodal interactions to redefine user engagement and analytical depth in generative visual analytics.
description: This work is accepted by the 27th Eurographics Conference on Visualization (EuroVis 2025). The paper contains 12 pages and 7 figures
A new distance to the Brick, the dense molecular cloud G0.253+0.016
Creators: name: Zoccali, M.
name: Valenti, E.
name: Surot, F.
name: Gonzalez, O. A.
name: Renzini, A.
name: Navarro, A. Valenzuela
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyse the near infrared colour magnitude diagram of a field including the giant molecular cloud G0.253+0.016 (a.k.a. The Brick) observed at high spatial resolution, with HAWK-I at the VLT. The distribution of red clump stars in a line of sight crossing the cloud, compared with that in a direction just beside it, and not crossing it, allow us to measure the distance of the cloud from the Sun to be 7.20, with a statistical uncertainty of +/-0.16 and a systematic error of +/-0.20 kpc. This is significantly closer than what is generally assumed, i.e., that the cloud belongs to the near side of the central molecular zone, at 60 pc from the Galactic center. This assumption was based on dynamical models of the central molecular zone, observationally constrained uniquely by the radial velocity of this and other clouds. Determining the true position of the Brick cloud is relevant because this is the densest cloud of the Galaxy not showing any ongoing star formation. This puts the cloud off by 1 order of magnitude from the Kennicutt-Schmidt relation between the density of the dense gas and the star formation rate. Several explanations have been proposed for this absence of star formation, most of them based on the dynamical evolution of this and other clouds, within the Galactic center region. Our result emphasizes the need to include constraints coming from stellar observations in the interpretation of our Galaxy central molecular zone.
description: 7 pages, 4 figures. Accepted for publication in MNRAS
Nova política de Acesso Aberto da Fundação para a Ciência e a Tecnologia e Portugal
Creators: name: Mendes Moreira, João
name: Novais, Joana
name: Pereira, Filipa
name: Pardelha, Filipa
name: Andrade, Miguel
Publisher: name: Zenodo
Year: 2024

description: Apresentação realizada na sessão Comunicações II, da 15ª Conferência Lusófona de Ciência Aberta, na Escola Superior de Enfermagem do Porto (ESEP), de 01 a 04 de outubro de 2024.
Discovery of a pair of very metal-poor stars enriched in neutron-capture elements: The proto-disk r-II star BPS CS 29529-0089 and the Gaia-Sausage-Enceladus r-I star TYC 9219-2422-1
Creators: name: da Silva, A. R.
name: Smiljanic, R.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: R-process enhanced metal-poor stars (\EuFe$\geq+0.3$ and \FeH$\leq-1.0$) are rare objects whose study can provide clues to the astrophysical sites of the rapid neutron capture process. In this study, we investigate the detailed chemical abundance patterns of two of these anomalous stars, originally identified among stars observed by the GALAH survey. Our aim is to obtain the detailed chemical abundance pattern of these stars with spectroscopy at higher resolution and signal-to-noise ratio. We use a calibration of the infrared flux method to determine accurate effective temperatures, and \Gaia~ parallaxes together with broadband photometry and theoretical bolometric corrections to determine surface gravity. Metallicities and chemical abundances are determined with model atmospheres and spectrum synthesis. We also integrate stellar orbits for a complete chemodynamic analysis. e determine abundances for up to 47 chemical species (44 elements), of which 27 are neutron-capture elements. Corrections because of deviations from the local thermodynamical equilibrium are applied to the metallicities and 12 elements. We find that one of the stars, BPS CS 29529-0089, is a proto-disk star of the Milky Way of r-II type, with \EuFe=+1.79~dex. The second star, TYC 9219-2422-1, is part of the halo and associated with the Gaia-Sausage-Enceladus merger event. It is of r-I type with [Eu/Fe] = +0.54. Abundances of Th are also provided for both stars. BPS CS 29529-0089 is the most extreme example of r-process enhanced star known with disk-like kinematics and that is not carbon enhanced. TYC 9219-2422-1 is found to be an archetypal Gaia-Sausage-Enceladus star. Their abundances of C, Mg, Ni, Sc, Mn, and Al seem consistent with expectations for stars enriched by a single population III core collapse supernova, despite their relatively high metallicities ([Fe/H] $\sim$ $-$2.4).
description: Accepted for publication in A&A. 20 pages, 20 figures in text and appendices
Optical spin pumping of modulation doped electrons probed by a two-color Kerr rotation technique
Creators: name: Hoffmann, H.
name: Astakhov, G. V.
name: Kiessling, T.
name: Ossau, W.
name: Karczewski, G.
name: Wojtowicz, T.
name: Kossut, J.
name: Molenkamp, L. W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on optical spin pumping of modulation electrons in CdTe-based quantum wells with low intrinsic electron density (by 10^10 cm^{-2}). Under continuous wave excitation, we reach a steady state accumulated spin density of about 10^8 cm^{-2}. Using a two-color Hanle-MOKE technique, we find a spin relaxation time of 34 ns for the localized electrons in the nearly unperturbed electron gas. Independent variation of the pump and probe energies demonstrates the presence of additional non-localized electrons in the quantum well, whose spin relaxation time is substantially shorter.
Idealized intimacy, openness in communication, and coping efforts : predictors of marital satisfaction
Creators: name: Afshar, Noushine
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this study was to examine, within 60 nonclinical, first-time married, heterosexual couples, whether marital satisfaction is predicted by three key variables: openness in communication (self-disclosure); discrepant intimacy (difference between perceived and ideal emotional intimacy); and positive coping efforts. Despite their importance in marriage, little research exists on the relative strength of each variable's contribution to marital satisfaction. To compare each variable's predictive strength, simultaneous multiple regression analyses were performed on responses to the following measures: Dyadic Adjustment Scale (DAS), Kansas Marital Satisfaction Scale (KMSS), Communication Scale, Personal Assessment of Intimacy in Relationships (PAIR), and Marital Coping Inventory (MCI). For all participants, discrepant emotional intimacy, selfdisclosure, and positive coping jointly contributed to satisfaction. However, discrepant intimacy and self-disclosure were stronger predictors (accounting for greater variance) of marital satisfaction compared to positive coping. Results of analyses for husbands' and wives' data also yielded significant, moderate, negative correlations between discrepant intimacy and marital satisfaction and between discrepant intimacy and selfdisclosure. Limitations of this study's findings, suggestions for future research, and implications for counselling are discussed.
Factsheet zur Open-Access-Strategie des Landes Brandenburg
Creators: name: Euler, Ellen
Publisher: name: Zenodo
Year: 2019
Subjects: Open Access
Open Access Strategie Brandenburg
Open Access Strategie des Landes Brandenburg
Open Science

description: Das Factsheet zur Open-Access-Strategie des Landes Brandenburg listet kompakt die wichtigsten Maßnahmen für die Akteure Wissenschaftler*innen / Hochschulleitung / Hochschulbibliotheken auf, die in der Strategie enthalten sind. Außerdem zeigt es auf, mit welchen Maßnahmen das Land Brandenburg die Beteiligten unterstützt, damit Open Access in den kommenden Jahren erheblich ausgebaut werden kann. Das Factsheet ist kein offizieller Teil der Open-Access-Strategie des Landes, sondern wurde von der Autorin als Arbeitshilfe konzipiert. Die Maßnahmen werden hier verkürzt wiedergegeben. Vollständig finden sie sich in der Strategie des Landes. Stand: August 2019
Voter models with heterozygosity selection
Creators: name: Sturm, Anja
name: Swart, Jan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 82C22 (Primary); 82C41, 60K35 (Secondary)

description: This paper studies variations of the usual voter model that favor types that are locally less common. Such models are dual to certain systems of branching annihilating random walks that are parity preserving. For both the voter models and their dual branching annihilating systems we determine all homogeneous invariant laws, and we study convergence to these laws started from other initial laws.
description: Published in at http://dx.doi.org/10.1214/07-AAP444 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Factors which contribute to eighth grade students’ feelings of mattering in private schools
Creators: name: Kifiak, Darleen M.
Publisher: name: University of British Columbia
Year: 2009

description: This study examined eighth grade students' perceived degree of mattering in their private school environments. Mattering, as defined by Rosenberg and McCullough (1981), is a person's sense that he is the object of interest and importance to others, he is wanted or serves as an ego-extension for others, and others depend on him. The study included 167 students from three urban private schools in the lower mainland. Students completed The Ways of Mattering Questionnaire (Individual and Group Forms), and a one page questionnaire, providing information about students' academic self-concept (Bachman's scale), student involvement in extracurricular school activities, and selected demographic variables. Step-wise multiple regression revealed that gender and grade point average were statistically significant predictive variables on the Group Mattering Scale in student to teacher relationships, and only grade point average was a significant predictive variable on the Individual Mattering Scale (student to peer relationships). Recommendations are provided for further study into students' feelings of mattering in the school environment.
Turbulent flow over transitionally rough surfaces with varying roughness densities
Creators: name: MacDonald, M.
name: Chan, L.
name: Chung, D.
name: Hutchins, N.
name: Ooi, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We investigate rough-wall turbulent flows through direct numerical simulations of flow over three-dimensional transitionally rough sinusoidal surfaces. The roughness Reynolds number is fixed at $k^+=10$, where $k$ is the sinusoidal semi-amplitude, and the sinusoidal wavelength is varied, resulting in the roughness solidity, $Λ$ (frontal area divided by plan area) ranging from 0.05 to 0.54. The high cost of resolving both the flow around the dense roughness elements and the bulk flow is circumvented by the use of the minimal-span channel technique, recently demonstrated by Chung et al. (J. Fluid Mech., vol. 773, 2015, pp. 418-431) to accurately determine the Hama roughness function, $ΔU^+$. Good agreement of the second-order statistics in the near-wall roughness-affected region between minimal- and full-span rough-wall channels is observed. In the sparse regime of roughness ($Λ\lesssim 0.15$) the roughness function increases with increasing solidity, while in the dense regime the roughness function decreases with increasing solidity. It was found that the dense regime begins when $Λ\gtrsim0.15-$0.18, in agreement with the literature. A model is proposed for the limit of $Λ\rightarrow\infty$, which is a smooth wall located at the crest of the roughness elements. This model assists with interpreting the asymptotic behaviour of the roughness, and the rough-wall data presented in this paper show that the near-wall flow is tending towards this modelled limit. The peak streamwise turbulence intensity, which is associated with the turbulent near-wall cycle, is seen to move increasingly further away from the wall with increasing solidity. In the sparse regime, increasing $Λ$ reduces streamwise turbulent energy associated with the near-wall cycle, while increasing $Λ$ in the dense regime increases turbulent energy [continued]$\ldots$
description: Accepted in the Journal of Fluid Mechanics
Energy Aware Self-Organizing Density Management in Wireless Sensor Networks
Creators: name: Merrer, Erwan Le
name: Gramoli, Vincent
name: Kermarrec, Anne-Marie
name: Viana, Aline
name: Bertier, Marin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Energy consumption is the most important factor that determines sensor node lifetime. The optimization of wireless sensor network lifetime targets not only the reduction of energy consumption of a single sensor node but also the extension of the entire network lifetime. We propose a simple and adaptive energy-conserving topology management scheme, called SAND (Self-Organizing Active Node Density). SAND is fully decentralized and relies on a distributed probing approach and on the redundancy resolution of sensors for energy optimizations, while preserving the data forwarding and sensing capabilities of the network. We present the SAND's algorithm, its analysis of convergence, and simulation results. Simulation results show that, though slightly increasing path lengths from sensor to sink nodes, the proposed scheme improves significantly the network lifetime for different neighborhood densities degrees, while preserving both sensing and routing fidelity.
Eigenmode analysis of membrane stability in inviscid flow
Creators: name: Mavroyiakoumou, Christiana
name: Alben, Silas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We study the instability of a thin membrane (of zero bending rigidity) to out-of-plane deflections, when the membrane is immersed in an inviscid fluid flow and sheds a trailing vortex-sheet wake. We solve the nonlinear eigenvalue problem iteratively with large ensembles of initial guesses, for three canonical boundary conditions---both ends fixed, one end fixed and one free, and both free. Over several orders of magnitude of membrane mass density, we find instability by divergence or flutter (particularly at large mass density, or with one or both ends free). The most unstable eigenmodes generally become "wavier" at smaller mass density and smaller tension, but with regions of nonmonotonic behavior. We find good quantitative agreement with unsteady time-stepping simulations at small amplitude, but only qualitative similarities with the eventual steady-state large-amplitude motions.
description: 28 pages, 22 figures
Cooling of a micro-mechanical oscillator using radiation pressure induced dynamical back-action
Creators: name: Schliesser, A.
name: Del'Haye, P.
name: Nooshi, N.
name: Vahala, K. J.
name: Kippenberg, T. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Cooling of a 58 MHz micro-mechanical resonator from room temperature to 11 K is demonstrated using cavity enhanced radiation pressure. Detuned pumping of an optical resonance allows enhancement of the blue shifted motional sideband (caused by the oscillator's Brownian motion) with respect to the red-shifted sideband leading to cooling of the mechanical oscillator mode. The reported cooling mechanism is a manifestation of the effect of radiation pressure induced dynamical backaction. These results constitute an important step towards achieving ground state cooling of a mechanical oscillator.
description: accepted for publication (Phys. Rev. Lett.)
Magnetic and geometric effects on the electronic transport of metallic nanotubes
Creators: name: Serafim, Felipe
name: Santos, Fernando A. N.
name: Lima, Jonas R. F.
name: Fumeron, Sébastien
name: Berche, Bertrand
name: Moraes, Fernando
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The investigation of curved low-dimensional systems is a topic of great research interest. Such investigations include two-dimensional systems with cylindrical symmetry. In this work, we present a numerical study of the electronic transport properties of metallic nanotubes deviating from the cylindrical form either by having a bump or a depression, and under the influence of a magnetic field. Under these circumstances, it is found that the nanotube may be used as an energy high-pass filter for electrons. It is also shown that the device can be used to tune the angular momentum of transmitted electrons.
description: The following article has been accepted by J. of Applied Physics
Relativistic Toda Chain with Boundary Interaction at Root of Unity
Creators: name: Iorgov, Nikolai
name: Roubtsov, Vladimir
name: Shadura, Vitaly
name: Tykhyy, Yuri
Publisher: name: arXiv
Year: 2007
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We apply the Separation of Variables method to obtain eigenvectors of commuting Hamiltonians in the quantum relativistic Toda chain at a root of unity with boundary interaction.
description: This is a contribution to the Vadim Kuznetsov Memorial Issue on Integrable Systems and Related Topics, published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Οι διαφορές των δύο φύλων στην αντιλαμβανόμενη ποιότητα των τραπεζικών υπηρεσιών:
Creators: name: Χαραλαμπίδης, Ωριγένης Χριστόδουλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Φύλο
Ποιότητα
Τραπεζικός τομέας
Gender
Quality
Banking sector

description: Σκοπός αυτής της διπλωματικής εργασίας είναι η αποτύπωση της στάσης των πελατών των ελληνικών τραπεζών απέναντι στην ποιότητα των τραπεζικών υπηρεσιών , τα επίπεδα σημαντικότητας της κάθε διάστασης ποιότητας και οι διαφοροποιήσεις που προκύπτουν σε αυτές και στην εκτίμηση της ποιότητας ανάλογα με το φύλο των πελατών. Στην έρευνα χρησιμοποιήθηκε το μοντέλο BSQ ,το οποίο διαμορφώθηκε από τους Bahia and Nantel (2000) , το οποίο είναι προσαρμοσμένο στην διερεύνηση της αντιλαμβανόμενης ποιότητας στον τραπεζικό τομέα.Τα αποτελέσματα της εμπειρικής έρευνας 369 ανδρών και γυναικών πελατών ελληνικών τραπεζών έδειξαν σε γενικές γραμμές ότι το φύλο του πελάτη επηρεάζει τόσο την αντιλαμβανόμενη ποιότητα τραπεζικών υπηρεσιών όσο και την σημαντικότητα κάθε διάστασης ποιότητας. Πιο συγκεκριμένα σε 23 από τα 31 χαρακτηριστικά ποιότητας δόθηκαν υψηλότερες αξιολογήσεις από τις γυναίκες σε σχέση με τους άντρες και σε έξι από αυτά τα χαρακτηριστικά η διαφοροποίηση ήταν στατιστικά σημαντική. Η χαμηλότερη βαθμολογία σχεδόν και για τα δύο φύλα παρουσιάστηκε στα χαρακτηριστικά των επιβαρύνσεων , υποδηλώνοντας την ανάγκη για περαιτέρω προσαρμογή της τιμολογιακής πολιτικής των τραπεζών στις οικονομικές συνθήκες που επικρατούν στην Ελλάδα. Τέλος παρατηρήθηκαν διαφοροποιήσεις ως προς την σημαντικότητα των διαστάσεων ποιότητας , στις γυναίκες σημαντικότερος παράγοντας ήταν αυτός των επιβαρύνσεων και της ταχύτητας εξυπηρέτησης ενώ στους άνδρες η αξιοπιστία και η ασφάλεια.
description: The main objective of this project is to investigate the level of perceived service quality of Greek banks on the basis of their male and female customer’s perceptions, the importance of each dimension of quality and the differences caused by customer gender effects. In our study we used the BSQ model, which was developed by Bahia and Nantel (2000) and is adapted to investigate the perceived service quality in the banking sector. Findings of the empirical research of 369 male and female customers of Greek banks suggested in general that the customer's gender, affects the perceived quality of banking services and the importance attached to each banking service quality dimension. Women in twenty-three of the thirty-one quality characteristics of BSQ model gave higher ratings compared with men , and in six of these characteristics the difference were statistical significant. The lowest score for both sexes occurred in the characteristics related with charges policy of banks, suggesting the need for further adjustment of it to meet current economic conditions in Greece. Finally the study revealed that in women the most important quality factor was pricing and service while in men reliability and assurance.
Local entanglement and quantum phase transition in 1D transverse field Ising model
Creators: name: Su, Shi-Quan
name: Song, Jun-Liang
name: Gu, Shi-Jian
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we study the entanglement between two-neighboring sites and the rest of the system in a simple quantum phase transition of 1D transverse field Ising model. We find that the entanglement shows interesting scaling and singular behavior around the critical point, and then can be use as a convenient marker for the transition point.
description: 5 pages, 5 figures
Γκαουσιανά μαρκοβιανά τυχαία πεδία: το μοντέλο Ising
Creators: name: Μιμίκου, Χριστίνα Παναγιώτου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Γκαουσιανό μαρκοβιανό τυχαίο πεδίο
Πίνακας ακρίβειας
Δεσμευμένη ανεξαρτησία
Gaussian markov random fields
Precision matrix
Conditional independence

description: Σκοπός της διατριβής ήταν η μελέτη των Γκαουσιανών Μαρκοβιανών Τυχαίων Πεδίων. Εξετάσαμε τις βασικές ιδιότητες τους, καθώς και τις υπό συνθήκη ιδιότητες τους. Στη συνέχεια παρουσιάσαμε αναλυτικά αλγόριθμους για την προσομοίωση ενός Γκαουσιανού Μαρκοβιανού Τυχαίου Πεδίου. Ακόμη αναφερθήκαμε αναλυτικά στα μοντέλα που βασίζονται στα Μαρκοβιανά Τυχαία Πεδία και μας απασχόλησε ιδιαίτερα η κατανόηση του μοντέλου Ising, το οποίο βρίσκει εφαρμογή σε πολλούς επιστημονικούς κλάδους. Ασχοληθήκαμε επιπλέον με τις εφαρμογές των μαρκοβιανών πεδίων, αλλά και με τις εφαρμογές του μοντέλου Ising. Τέλος, διατυπώσαμε και εξηγήσαμε τα αποτελέσματα από την εφαρμογή του μοντέλου Ising.
description: The aim of this thesis was the study of the Gaussian Markov Random Fields. We examined the basic properties and the conditional properties. Then we presented algorithms for the simulation of a Gaussian Markov Random Field. Furthermore, we analyzed the models based on Markov Random Fields and we examined the Ising model, which finds application in many disciplines. We also examined the applications of Markov fields, and the applications of the Ising model. Finally, we formulated and explained the results of the application of the Ising model.
Extended atomic carbon around molecular clouds
Creators: name: Ossenkopf-Okada, V.
name: Karska, A.
name: Benedettini, M.
name: Colombo, D.
name: Simon, R.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Models predict that atomic carbon occurs at the surface and in the process of the formation of molecular clouds, making its fine structure transitions a diagnostic of cloud formation. We study the distribution of atomic carbon in a small inconspicuous region towards the outer Galaxy that might be representative for a large fraction of the molecular gas of the Milky Way that is not directly affected by star formation. We observed a small strip of 5 arcminutes in the ``Forgotten Quadrant'', the third quadrant of the Milky Way, with the APEX telescope in the $^3P_1-^3P_0$ [CI] transition of atomic carbon and the $J=2-1$ transition of the three most abundant CO isotopologues and compared their distribution with existing measurements of gas column density and of ionized carbon. The atomic carbon shows a very smooth distribution with the smallest gradient along the strip compared to the other lines. It is always brighter than $^{13}$CO and in one velocity-component even brighter than CO. In contrast to observations of many star-forming regions, the [CI] emission seems to extend beyond the molecular gas, in line with the models of photon-dominated regions (PDRs). However, a standard PDR model fit to the observations fails because the models either predict more molecular gas, traced through C$^{18}$O, or more diffuse gas, traced through [CII], than observed. The carbon-budget in the gas phase does not add up to the same column seen through dust emission. To understand the [CI] emission from galaxies it is necessary to get the full statistics for the quiescent gas outside of the star-forming regions that behaves significantly different from dense gas exposed to high ultraviolet fields.
description: Accepted for publication in A&A
Ελεύθερο/Ανοιχτό Λογισμικό για τον Προγραμματισμό: η περίπτωση του Opentaps
Creators: name: Παντουφλά, Παρθένα Στυλιανού
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Λογισμικό Ανοιχτού Κώδικα
Προγραμματισμός Απαιτήσεων Υλικών
Opentaps
Open Source Software
Material Requirements Planning

description: Σκοπός της εργασίας αυτής ήταν να εντοπίσει και να συγκεντρώσει όλα τα βασικά στοιχεία λειτουργίας των ελεύθερων λογισμικών / λογισμικών ανοιχτού κώδικα, να παρουσιάσει δειγματοληπτικά κάποια από τα συστήματα αυτά που προσφέρονται δωρεάν μέσω διαδικτύου και να μελετήσει την περίπτωση υιοθέτησης ενός τέτοιου λογισμικού σε πραγματικό επιχειρησιακό περιβάλλον. Για να επιτευχθεί ο στόχος αυτός η έρευνα εστιάστηκε στην υλοποίηση Προγραμματισμού Απαιτήσεων Υλικών (MRP) σε παραγωγική επιχείρηση με τη χρήση ενός ERP ανοιχτού κώδικα, το Opentaps ERP + CRM. Από τα αποτελέσματα της πρακτικής αυτής εφαρμογής προέκυψε ότι η συμβολή του λογισμικού στον προγραμματισμό των απαιτούμενων υλικών είναι ιδιαίτερα σημαντική, καθώς συστηματοποιούνται οι διαδικασίες και επιτυγχάνεται γρηγορότερος ρυθμός διεκπεραίωσης των εργασιών. Παράλληλα όμως διεξήχθη και το συμπέρασμα ότι ένα τέτοιο σύστημα προγραμματισμού είναι ιδιαίτερα ευαίσθητο στα αποτελέσματα που εξάγει ανάλογα με τα δεδομένα που εισάγονται σ’ αυτό.
description: The purpose of this study was to identify and collect all the basics of running free / open source software, to present a sampling of these systems which can be find on the Internet and to study the implementation of such a software in real operational environments. To achieve this target, the research focused on the implementation of Material Requirements Planning (MRP) at a production enterprise by using an open source ERP, Opentaps ERP + CRM. The results of applying this practice showed that the contribution of this software on material requirements planning is particularly important, as it systemizes processes. At the same time there is the conclusion that such a programming system is particularly sensitive to the results obtained depending on the data entered in this.
The Impact of Sunspots on the Interpretation of Coronal Observations of the O VI Doublet
Creators: name: Morgan, H.
name: Habbal, Shadia Rifai
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Due to their high intensity of emission in the O VI 1031.9 and 1037.6A lines, even small sunspots on the solar disk can strongly influence the intensity of the radiative scattering component of O VI lines in the corona. Observations of O VI disk spectra show a 1032/1038 line intensity ratio of >2.6 in a sunspot compared to quiet disk values of 2. The enhancement of the 1032 line in comparison to the 1038 is likely due to interaction between molecular hydrogen emission from the sunspot and the chromospheric O5+. Modeling shows that a contribution from sunspots increases the coronal O VI 1032/1038 intensity ratio to values considerably higher than those achieved with a quiet disk or coronal hole spectrum. Therefore a re-examination of flow velocities derived from UVCS/SOHO streamer observations must be made. This modeling demonstrates that the inclusion of sunspots, when present, may lead to non-zero outflow velocities at lower heights in streamer cores in contrast to some existing model results.
description: 4 pages, 3 figures
A study of adoption reunions and self concept in adult adoptees
Creators: name: Moniz-Lecce, Sandra
Publisher: name: University of British Columbia
Year: 2009

description: The primary aim of this study was to examine whether adoptees who had experienced a reunion with a birth relative would score more positively on a measure of self-concept than adoptees who had not experienced a reunion. The Tennessee Self- Concept Scale (Roid & Fitts, 1988) was administered by mailout to adoptees who were members of the Forget Me Not Family Society or the TRIAD Society. A total of 159 adult adoptees participated in the study. Contrary to expectation, the results of the study indicated no differences on self-concept scores between reunited and searching adoptees. In addition, the mean scores of adoptees in this study were within the normal limits reported for the general population. The findings seem to indicate that as a group, adoptees do not differ in self-concept from the general population and also that reunions do not influence the self-concept of adult adoptees.
Electronic structure and electric-field gradients analysis in $CeIn_3$
Creators: name: Asadabadi, S. Jalali
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Electric field gradients (EFG's) were calculated for the $CeIn_3$ compound at both $^{115}In$ and $^{140}Ce$ sites. The calculations were performed within the density functional theory (DFT) using the augmented plane waves plus local orbital (APW+lo) method employing the so-called LDA+U scheme. The $CeIn_3$ compound were treated as nonmagnetic, ferromagnetic, and antiferromagnetic cases. Our result shows that the calculated EFG's are dominated at the $^{140}Ce$ site by the Ce-4f states. An approximately linear relation is intuited between the main component of the EFG's and total density of states (DOS) at Fermi level. The EFG's from our LDA+U calculations are in better agreement with experiment than previous EFG results, where appropriate correlations had not been taken into account among 4f-electrons. Our result indicates that correlations among 4f-electrons play an important role in this compound and must be taken into account.
Inverse square problem and so(2,1) symmetry in noncommutative space
Creators: name: Giri, Pulak Ranjan
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the quantum mechanics of a system with inverse square potential in noncommutative space. Both the coordinates and momentums are considered to be noncommutative, which breaks the original so(2,1) symmetry. The energy levels and eigenfunctions are obtained. The generators of the so(2,1) algebra are also studied in noncommutative phase space and the commutators are calculated, which shows that the so(2,1) algebra obtained in noncommutative space is not closed. However the commutative limit Θ,\barΘ\to 0 for the algebra smoothly goes to the standard so(2,1) algebra.
description: 5 pages, Revised version
Η βιομηχανική πολιτική της Αγγλίας και οι επιπτώσεις της στις εξαγωγές:
Creators: name: Χατζηστεφάνου, Σεραφείμ Αποστόλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Βιομηχανία
Εμπόριο
Εξαγωγές
Industry
Trade
Exports

description: Σκοπός της διπλωματικής εργασίας είναι η ανάλυση της βιομηχανικής πολιτικής που ακολουθεί η Αγγλία καθώς και ο τρόπος με τον οποίο επηρεάζει τις εξαγωγές της όπως και η αποκρυπτογράφηση του εξαγωγικού της προφίλ. Αρχικά παρατίθεται και αναλύεται το θεωρητικό υπόβαθρο όσον αφορά την έννοια του διεθνούς εμπορίου καθώς και τις θεωρίες διεθνούς εμπορίου που κατά καιρούς έχουν διατυπωθεί από τους εκπροσώπους των διαφόρων οικονομικών σχολών. Εν συνεχεία αναλύεται η έννοια της βιομηχανικής πολιτικής καθώς επίσης και οι μορφές που μπορεί να λάβει, ενώ ακολουθεί η παρουσίαση της βιομηχανικής πολιτικής που ασκεί η Ε.Ε. καθώς και τα ποικίλα μέτρα που λαμβάνει προκειμένου να επιτύχει τους στόχους της. Στο επόμενο μέρος ακολουθεί η αναλυτική περιγραφή της βιομηχανικής πολιτικής που υιοθετείται από την Αγγλία καθώς και των ιδιαίτερων μέτρων που λαμβάνονται προκειμένου να επιτευχθούν οι στόχοι που έχουν τεθεί. Στο τελευταίο μέρος αναλύεται το εξαγωγικό προφίλ της Αγγλίας με τη χρήση διαφόρων οικονομικών δεικτών καθώς και με την παράθεση του δυναμικού και δομικού διαγράμματος.
description: The purpose of the present study is the analysis of the industrial policy of UK as well as the way that this influences the export profile of the country. At first, there is a detailed reference of the various theories of international trade that have been stated from the different economic schools whereas in the next chapter the meaning of industrial policy is being analyzed as well as the various forms that can be used. Then there is a reference to the European’s Union industrial policy and the different way that is being used in order to fulfil its targets. In the next chapter there is a detailed description of England’s industrial policy that is adopted so as to achieve its goals.. At last with the reference of various economic indexes as well as the dynamic diagram, the export profile of England is being analyzed
A survey of the linear polarization of directly imaged exoplanets and brown dwarf companions with SPHERE-IRDIS. First polarimetric detections revealing disks around DH Tau B and GSC 6214-210 B
Creators: name: van Holstein, R. G.
name: Stolker, T.
name: Jensen-Clem, R.
name: Ginski, C.
name: Milli, J.
name: de Boer, J.
name: Girard, J. H.
name: Wahhaj, Z.
name: Bohn, A. J.
name: Millar-Blanchaer, M. A.
name: Benisty, M.
name: Bonnefoy, M.
name: Chauvin, G.
name: Dominik, C.
name: Hinkley, S.
name: Keller, C. U.
name: Keppler, M.
name: Langlois, M.
name: Marino, S.
name: Ménard, F.
name: Perrot, C.
name: Schmidt, T. O. B.
name: Vigan, A.
name: Zurlo, A.
name: Snik, F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Young giant planets and brown dwarf companions emit near-infrared radiation that can be linearly polarized up to several percent. This polarization can reveal the presence of a circumsubstellar accretion disk, rotation-induced oblateness of the atmosphere, or an inhomogeneous distribution of atmospheric dust clouds. We measured the near-infrared linear polarization of 20 known directly imaged exoplanets and brown dwarf companions with the high-contrast imager SPHERE-IRDIS at the VLT. We reduced the data using the IRDAP pipeline to correct for the instrumental polarization and crosstalk with an absolute polarimetric accuracy <0.1% in the degree of polarization. We report the first detection of polarization originating from substellar companions, with a polarization of several tenths of a percent for DH Tau B and GSC 6214-210 B in H-band. By comparing the measured polarization with that of nearby stars, we find that the polarization is unlikely to be caused by interstellar dust. Because the companions have previously measured hydrogen emission lines and red colors, the polarization most likely originates from circumsubstellar disks. Through radiative transfer modeling, we constrain the position angles of the disks and find that the disks must have high inclinations. The presence of these disks as well as the misalignment of the disk of DH Tau B with the disk around its primary star suggest in situ formation of the companions. For the 18 other companions, we do not detect significant polarization and place subpercent upper limits on their degree of polarization. These non-detections may indicate the absence of circumsubstellar disks, a slow rotation rate of young companions, the upper atmospheres containing primarily submicron-sized dust grains, and/or limited cloud inhomogeneity. Finally, we present images of the circumstellar disks of DH Tau, GQ Lup, PDS 70, Beta Pic, and HD 106906.
description: Accepted for publication in A&A. Shortened abstract. 29 pages, 22 figures
Ανάπτυξη Εφαρμογών και Ιστοσελίδας με Θέμα την Ροή Θερμότητας και την Σχέση της με την Θερμοκρασία:
Creators: name: Μηλιάκος, Ιωάννης Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Ροή Θερμότητας
Εξ αποστάσεως Εκπαίδευση
Προσομοίωση
Heat Flow
e-Learning
PC application

description: Η παρούσα εργασία αποτελεί την περιγραφή της δημιουργίας μιας εκπαιδευτικής ιστοσελίδας, που απευθύνεται σε χρήστες του διαδικτύου με ενδιαφέρον στην φυσική. Το θέμα που πραγματεύεται είναι η ροή θερμότητας από το εξωτερικό περιβάλλον προς έναν εσωτερικό χώρο, π.χ. ένα σπίτι, με χαρακτηριστικά που επιλέγει ο χρήστης. Το εκπαιδευτικό σενάριο της σελίδας αποσκοπεί στον δημιουργικό και γεμάτο φαντασία τρόπο απόδοσης της θεωρίας γύρω από το θέμα. Ο τρόπος παρουσίασης της αξιολόγησης ως μέσω ανατροφοδότησης του χρήστη και η ιδιαίτερα εύχρηστη και ευχάριστη παρουσίαση του εικονικού πειράματος είναι απαραίτητες σχεδιαστικές απαιτήσεις για τον σχεδιασμό αυτού του εκπαιδευτικού σεναρίου. Μέσα από την δομή της σελίδας (θεωρία – πείραμα/προσομοίωση – ασκήσεις) οδηγείται ο χρήστης σε μια ομαλή διαδικασία μάθησης από απόσταση με την δυνατότητα αυτό-αξιολόγησης, χωρίς την φυσική παρουσία εκπαιδευτικού. Η αλληλεπίδραση με τον εκπαιδευτικό μπορεί να γίνει μέσω ηλεκτρονικού ταχυδρομείου.
description: Ιn this paper we describe the creation of an educational website for internet users with an interest in Physics. The context of this website is the heat flux from the external environment to an interior space, for example a house, which features are chosen by the user. The educational scenario aims at a creative and imaginative rendering of the theory on the subject. The presentation of the evaluation of the user’s predictions on the outcome of the experiment, as a mean of the user’s feedback, and the easy and pleasant presentation of the virtual experiment design were the requirements for the design of the training scenario. Through the page structure (theory - experiment / simulation - exercises), the user is guided through a smooth process of learning from a distance, with the possibility of self-evaluation, without the physical presence of a teacher. The interaction with the teacher can be done by e mail.
ERICC Working Paper _ ERICC Application of the RISE Diagnostic for Teacher Management in Jordan
Creators: name: ERICC Consortium
name: Rauschenberger, Emilee
name: Brown, Lindsay
name: Belafi, Carmen
name: Ammash, Celine
name: Sarabi, Hala
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 390201
subject: Education policy

description: The study presented here applied systems thinking to the context of Jordan to assess the wider factors and potential misalignments affecting teacher management in the country. The study was conducted by a team of researchers from New York University-TIES and the Queen Rania Foundation (QRF) in Jordan as part of the Education Research in Conflict and Protracted Crisis (ERICC) Research Programme Consortium (referred to in this report as the ERICC team).The ERICC team set out to apply the RISE Diagnostic Framework to the case of Jordan’s education sector, ultimately adapting and applying the tool to identify and prioritise misalignments within the country’s teacher management system. In doing so, the RISE Diagnostic Framework helped the ERICC team to map the varying purposes for which different parts of the teacher management system were aligned.The RISE Framework proposes that education systems consist of four key relationships of accountability between different principals and agents: Compact (Relationship between the highest authorities of the state and education authorities including the Ministry of Education, or MoE); Management (Relationship between the education authorities and frontline providers of education i.e., schools, principals, teachers); Voice and Choice (Relationship between frontline providers of services and recipients of services); and Politics (Relationship between citizens and the highest authorities of the state). Of these relationships, the study was limited to examining the first two relationships, Compact and Management, in the context of teacher management in Jordan.Based on the RISE diagnostic analysis, the ERICC team finds that Jordan’s teacher management system appears to be primarily aligned for access and process compliance, with pockets of stakeholders attempting to bring greater focus on, and alignment for, learning outcomes. Seven misalignments are identified, primarily within the Management relationship. In addition, the team identifies three recommendations and considerations for future applications of the diagnostic in conflict-affected contexts: (1) limited accessibility and interpretation challenges of MoE policies and the invisibility of policies related to refugees’ education provision; (2) the tool likely requires additional piloting in order to operationalise best practices; and (3) a system-wide diagnostic has tension between inclusivity of minorities and overall influence within the system.