cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Perception of fatigue and couple communication in people with multiple sclerosis and their spouses: relationship to coping efficacy
Creators: name: Whittall, Jane Susan
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this exploratory study was to determine the extent to which congruence in the perception of fatigue impact between people with multiple sclerosis (MS) and their spouses is related to the coping efficacy of the individuals with MS. Although fatigue is a well known symptom in MS, the nature of its impact on the individual with the disease as well as on their spouse is poorly understood. Working from Lazarus and Folkman's (1984) model of stress and coping, I questioned whether individuals with MS appraise the impact of their fatigue differently than do their spouses, and whether the degree of incongruence is related to the coping efficacy of the person with MS. Criteria for inclusion included married couples in which one person: (a) had been diagnosed with MS for at least one year, and (b) identified fatigue as a symptom. The ENRICH Couple Communication Scale (Olson, 1985) and The Fatigue Impact Scale (Fisk, Pontefract, Ritvo, Archibald, & Murray, 1994) were administered to 60 couples in which one person had MS. Individuals with MS then rated their perception of coping efficacy using a modified version of the Coping Strategy Indicator (Amirkhan, 1990). Efficacy of avoidance, problem solving, and seeking social support coping strategies was examined using the 3 subscales of this instrument. In addition, The ENRICH Couple Communication Scale (Olson, 1985) assessed congruence about communication within married couples. The extent to which congruence concerning fatigue impact and communication was related to coping efficacy of the individuals who have MS was examined using three simultaneous multiple regression analyses. Although congruence concerning communication was a significant predictor of avoidance coping efficacy, congruence of fatigue impact did not appear to be a significant predictor of coping efficacy on any of the subscales. Implications for theory and research were discussed, among them being an increased understanding of (a) coping efficacy, (b) the operationalization of congruence, and (c) the perception of an invisible symptom such as fatigue in people who are ill , as well as their spouses' perceptions of the fatigue.
Strong coupling theory for the superfluidity of Bose-Fermi mixtures
Creators: name: Wang, Daw-Wei
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We develop a strong-coupling theory for the superfluidity of fermion pairing phase in a Bose-Fermi mixture. Dynamical screening, self-energy renormalization, and a pairing gap function are included self-consistently within the adiabatic limit (i.e., the phonon velocity is much smaller than the Fermi velocity). An analytical solution for the transition temperature (Tc) is derived within reasonable approximations. Using typical parameters of a 40K-87Rb mixture, we find that the calculated Tc is several times larger than that obtained in the weak coupling theory, and can be up to several percents of the Fermi temperature.
description: 4 pages and 3 figures
Exploring flares around the ultracool M dwarf VB-10 with high resolution infrared spectroscopy
Creators: name: Kanodia, Shubham
name: Ramsey, Lawrence
name: Ninan, P. Joe
name: Mahadevan, Suvrath
Publisher: name: Zenodo
Year: 2021
Subjects: Very low mass stars

description: Flare activity in late M stars remains an interesting topic since there is as yet no well tested model of how these convective stars generate the magnetic field that underlie activity such as flares, and the rate and strengths of the flare can impact the evolution of the atmospheres of planets orbiting them We present observations of two flares observed on the M8 star VB10 with the Habitable zone Planet Finder (HPF) on the Hobby Eberly Telescope. HPF is designed to be very stable for precision radial velocities but its NIR coverage (810-1280 nm) and queue scheduled operations allow us to obtain multiple observations to analyze the properties of the flares. A combination of the 10 m telescope aperture with the nondestructive read readout with our H2RG enables us to obtain a time resolution of ~ minutes on this late type M dwarf, which helps us resolve the evolution of the flare. We present our analysis of the Ca II infrared triple lines as well as Pa $\gamma$ and $\delta$ to place constraints on the time behavior and physical conditions of the emitting material.
description: {"references": ["http://adsabs.harvard.edu/abs/2008A%26A...487..293F", "http://adsabs.harvard.edu/abs/2012ApJ...745...14S", "http://stacks.iop.org/0004-637X/676/i=2/a=1307", "http://adsabs.harvard.edu/abs/1999ApJ...519..345L"]}
ERICC Policy Brief _ Madrasa education in crisis: evaluating educational gaps and solutions for Rohingya and host communities in Cox’s Bazar
Creators: name: ERICC Consortium
name: Haque, Ashraf
name: Abedin, Mohosin
name: Hasan, Galib
name: Saha, Proma
name: Dow, Jeffrey
name: Diazgranados Ferráns, Silvia
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 390201
subject: Education policy

description: This policy brief synthesises findings from an ERICC formative study titled “Understanding madrasa education for enhancing access to and quality of education for the Rohingyas and the host community” (forthcoming 2024), which was identified as a research priority after a comprehensive evidence review1 and extensive consultations with stakeholders in Cox’s Bazar . The study investigated teaching and learning practices in madrasas, the knowledge and skills imparted through various branches of the madrasa curriculum, and student assessment processes. The primary objective is to explore potential collaborations between madrasas and humanitarian education providers to improve the quality of education. The brief highlights the role of madrasa education in providing access to education for both Rohingya refugees and the host community, as well as the challenges such as inadequate infrastructure and teacher training. To enhance the quality of madrasa education, the brief recommends a multifaceted approach for both communities, including socio-emotional learning, professional development for teachers, mental health support and gender equality.
Evolution of three-dimensional coherent structures in Hall magnetohydrodynamics
Creators: name: Bora, Kamlesh
name: Bhattacharyya, Ramit
name: Smolarkiewicz, Piotr K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The work extends the computational model EULAG-MHD to include Hall magnetohydrodynamics (HMHD)---important to explore physical systems undergoing fast magnetic reconnection at the order of the ion inertial length scale. Examples include solar transients along with reconnections in magnetosphere, magnetotail and laboratory plasmas. The paper documents the results of two distinct sets of implicit large-eddy simulations in the presence and absence of the Hall forcing term, initiated with an unidirectional sinusoidal magnetic field. The HMHD simulation while benchmarking the code also emphasizes the complexity of three dimensional (3D) evolution over its two dimensional (2D) counterpart. The magnetic reconnections onset significantly earlier in HMHD. Importantly, the magnetic field generated by the Hall term breaks any inherent symmetry, ultimately making the evolution 3D. The resulting 3D reconnections develop magnetic flux ropes and magnetic flux tubes. Projected on the reconnection plane, the ropes and tubes appear as magnetic islands, which later break into secondary islands, and finally coalesce to generate an X-type neutral point. These findings are in agreement with the theory and contemporary simulations of HMHD, and thus verify our extension of the EULAG-MHD model. The second set explores the influence of the Hall forcing on generation and ascend of a magnetic flux rope from sheared magnetic arcades---a novel scenario instructive in understanding the coronal transients. The rope evolves through intermediate complex structures, ultimately breaking locally because of reconnections. Interestingly, the breakage occurs earlier in the presence of the Hall term, signifying faster dynamics leading to magnetic topology favorable for reconnections.
description: Accepted for publication in ApJ
What to Expect When You're Expecting: Femtoscopy at the LHC
Creators: name: Lisa, Mike
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A huge systematics of femtoscopic measurements have been used over the past 20 years to characterize the system created in heavy ion collisions. These measurements cover two orders of magnitude in energy, and with LHC beams imminent, this range will be extended by more than another order of magnitude. Here, I discuss theoretical expectations of femtoscopy of $A+A$ and $p+p$ collisions at the LHC, based on Boltzmann and hydrodynamic calculations, as well as on naive extrapolation of existing systematics.
description: 6 pages; 8 figures; Invited talk at the Second Workshop on Particle Correlations and Femtoscopy (WPCF06), Sept 9-11 2006, Sao Paulo, Brazil
Δράση ομάδας προσβασιμότητας: διεκδικώντας την πρόσβαση σε ένα ανάπηρο πανεπιστήμιο
Creators: name: Παπαπέτρου, Χαράλαμπος Γεωργίου
name: Δάφα, Μαρία Γεωργίου
name: Ευθυμιάδης, Σταύρος Ματθαίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Αναπηρία
Προσβασιμότητα
Έρευνα δράσης
Disability
Accessibility
Action research

description: Η εργασία αποτυπώνει και αναλύει την δράση της Ομάδας Προσβασιμότητας στο Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης από τη δημιουργία της, τον Νοέμβριο του 2008 μέχρι και το Νοέμβριο του 2010. Βασικός στόχος της ομάδας ήταν η διεκδίκηση ενός πλήρους προσπελάσιμου πανεπιστημίου για όλους, αλλά και η ανάδειξη του ζητήματος της προσβασιμότητας τόσο εντός του πανεπιστημίου, όσο και στη πόλη της Θεσσαλονίκης. Η καταγραφή βασίζεται στην εμπειρία και το βίωμα των μελών της ομάδας, όπως αυτά αποτυπώθηκαν σε μορφή ημερολογίου και αποδίδονται με βάση τις αρχές της συμμετοχικής έρευνας δράσης. Στην εργασία περιγράφονται: η πορεία της ομάδας (τον τρόπο και τον λόγο σύστασής της), οι δράσεις διεκδίκησης και ανάδειξης του ζητήματος και οι επαφές της ομάδας με αρμόδιους φορείς και θεσμούς του Α.Π.Θ.. Τα ευρήματα παρουσιάζονται σε τρείς χρονικούς κύκλους με βάση τα κομβικά σημεία εξέλιξης της ομάδας. Τα συμπεράσματα της έρευνας δεν είναι γενικεύσιμα σε οποιεσδήποτε συνθήκες και χώρους και δεν προτείνονται μέθοδοι, εργαλεία ή «συνταγές». Αποτυπώνεται μόνο η υποκειμενική κρίση των ερευνητών στο συγκεκριμένο πολιτικό και κοινωνικό πλαίσιο με σκοπό να λειτουργήσει ως παράδειγμα ή κίνητρο για παρόμοιους τρόπους παρέμβασης σε κοινοτικό επίπεδο.
description: This essay depicts and analyses the actions of the Accessibility Group at the Aristotle University of Thessaloniki, from the time of its creation on November of 2008 and until November of 2010. The basic goal of the group was to assert a fully accessible university campus for all, and to highlight the issue of accessibility insight the university and outside, in the city of Thessaloniki. This chronicle is based on the experiences of the group members as these were documented in the form of a journal and are formed based on the principles of participatory action research. In the essay we describe the course of the group its self, the related actions of the group and its contacts with the university authorities and institutions. The findings are presented in three time periods defined by major events in the group development. The research conclusions are not to be generalized in any given conditions and there are no methods of work to be proposed. This essay only reflects the researchers’ subjective judgment in the specific political and social context and aims to serve as an example for similar causes of action at Community level.
Nonlinear Laser-Induced Deformations of Liquid-Liquid Interfaces: an Optical Fiber Model
Creators: name: Birkeland, Ole Jakob
name: Brevik, Iver
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Experimentally, it turns out that radiation forces from a cw-laser on a liquid-liquid interface are able to produce giant deformations (up to about 100μm), if the system is close to the critical point where the surface tension becomes small. We present a new model for such a fingerlike deformation, implying that the system is described as an optical fiber. One reason for introducing such a model is that the refractive index difference in modern experiments, such as those of the Bordeaux group, is small, of the same order as in practical fibers in optics. It is natural therefore, to adopt the hybrid HE_{11} mode, known from fiber theory, as the fundamental mode for the liquid system. We show how the balance between hydrodynamical and radiation forces leads to a stable equilibrium point for the liquid column. Also, we calculate the narrowing of the column radius as the depth increases. Comparison with experimental results of the Bordeaux group yields quite satisfactory agreement as regards the column width.
description: 24 pages latex, 7 figures; major revisions. Version to appear in Phys. Rev. E
Do we need non-ideal magnetohydrodynamics to model protostellar discs?
Creators: name: Wurster, James
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigate and discuss protostellar discs in terms of where the various non-ideal magnetohydrodynamics (MHD) processes are important. We find that the traditional picture of a magnetised disc (where Ohmic resistivity is dominant near the mid-plane, surrounded by a region dominated by the Hall effect, with the remainder of the disc dominated by ambipolar diffusion) is a great oversimplification. In simple parameterised discs, we find that the Hall effect is typically the dominant term throughout the majority of the disc. More importantly, we find that in much of our parameterised discs, at least two non-ideal processes have coefficients within a factor of 10 of one another, indicating that both are important and that naming a dominant term underplays the importance of the other terms. Discs that were self-consistently formed in our previous studies are also dominated by the Hall effect, and the ratio of ambipolar diffusion and Hall coefficients is typically less than 10, suggesting that both terms are equally important and listing a dominant term is misleading. These conclusions become more robust once the magnetic field geometry is taken into account. In agreement with the literature we review, we conclude that non-ideal MHD processes are important for the formation and evolution of protostellar discs. Ignoring any of the non-ideal processes, especially ambipolar diffusion and the Hall effect, yields an incorrect description of disc evolution.
description: Accepted for publication in MNRAS; 20 pages, 15 figures
Chiral family classification of fermionic Z2xZ2 heterotic orbifold models
Creators: name: Faraggi, Alon E.
name: Kounnas, Costas
name: Rizos, John
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Free fermionic construction of four dimensional string vacua, are related to the Z2XZ2 orbifolds at special points in the moduli space, and yielded the most realistic three family string models to date. Using free fermionic construction techniques we are able to classify more than 10^10 string vacua by the net family and anti-family number. Using a montecarlo technique we find that a bell shaped distribution that peaks at vanishing net number of chiral families. We also observe that ~15% of the models have three net chiral families. We find that in addition to mirror symmetry that the distribution exhibits a symmetry under the exchange of (spinor plus anti-spinor) representations with vectorial representations.
description: 12 pages. Standard Latex. 2 figures. Final version to be published in PLB
BCI_For_Differently_abled_People(Left and Right hand movement)
Creators: name: Vishwakarma, Shashi
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 460806
subject: Human-computer interaction
classificationCode: 461103
subject: Deep learning
classificationCode: 461104
subject: Neural networks
classificationCode: 461106
subject: Semi- and unsupervised learning
classificationCode: 460708
subject: Virtual and mixed reality
classificationCode: 429999
subject: Other health sciences not elsewhere classified

description: The research is about BCI i.e. Brain-Computer interface, that will help disabled or differently-abled people in rehabilitation. It includes some of the major paper reviews and detailed information about the advanced topic of research.
Interaction-induced crossover versus finite-size condensation in a weakly interacting trapped one-dimensional Bose gas
Creators: name: Bouchoule, Isabelle
name: Kheruntsyan, Karen V.
name: Shlyapnikov, Gora
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss the transition from a fully decoherent to a (quasi-)condensate regime in a harmonically trapped weakly interacting 1D Bose gas. By using analytic approaches and verifying them against exact numerical solutions, we find a characteristic crossover temperature and crossover atom number that depend on the interaction strength and the trap frequency. We then identify the conditions for observing either an interaction-induced crossover scenario or else a finite-size Bose-Einstein condensation phenomenon characteristic of an \textit{ideal} trapped 1D gas.
description: 4 pages
Photoinduced Dirac semimetal in ZrTe5
Creators: name: Konstantinova, T.
name: Wu, L.
name: Yin, W. -G.
name: Tao, J.
name: Gu, G. D.
name: Wang, X. J.
name: Yang, Jie
name: Zaliznyak, I. A.
name: Zhu, Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Novel phases of matter with unique properties that emerge from quantum and topological protection present an important thrust of modern research. Of particular interest is to engineer these phases on demand using ultrafast external stimuli, such as photoexcitation, which offers prospects of their integration into future devices compatible with optical communication and information technology. Here, we use MeV Ultrafast Electron Diffraction (UED) to show how a transient three-dimensional (3D) Dirac semimetal state can be induced by a femtosecond laser pulse in a topological insulator ZrTe$_5$. We observe marked changes in Bragg diffraction, which are characteristic of bond distortions in the photoinduced state. Using the atomic positions refined from the UED, we perform density functional theory (DFT) analysis of the electronic band structure. Our results reveal that the equilibrium state of ZrTe$_5$ is a topological insulator with a small band gap of $\sim$25 meV, consistent with angle-resolved photoemission (ARPES) experiments. However, the gap is closed in the presence of strong spin-orbit coupling (SOC) in the photoinduced transient state, where massless Dirac fermions emerge in the chiral band structure. The time scale of the relaxation dynamics to the transient Dirac semimetal state is remarkably long, $τ\sim$160 ps, which is two orders of magnitude longer than the conventional phonon-driven structural relaxation. The long relaxation is consistent with the vanishing density of states in Dirac spectrum and slow spin-repolarization of the SOC-controlled band structure accompanying the emergence of Dirac fermions.
description: 19 pages, 4 figures plus 7 Supplementary pages, 5 Supplementary figures
The cyclo-synchrotron process and particle heating through the absorption of photons
Creators: name: Katarzynski, K.
name: Ghisellini, G.
name: Svensson, R.
name: Gracia, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We propose a new approximation for the cyclo-synchrotron emissivity of a single electron. In the second part of this work, we discuss a simple application for our approximation, and investigate the heating of electrons through the self-absorption process. Finally, we investigate the self-absorbed part of the spectrum produced by a power-law population of electrons. In comparison to earlier approximations, our formula provides a few significant advantages. Integration of the emissivity over the whole frequency range, starting from the proper minimal emitting frequency, gives the correct cooling rate for any energy particle. Further, the spectrum of the emission is well approximated over the whole frequency range, even for relatively low particle energies (beta << 0.1), where most of the power is emitted in the first harmonic. In order to test our continuous approximation, we compare it with a recently derived approximation of the first ten harmonics. Finally, our formula connects relatively smooth to the synchrotron emission at beta=0.9. We show that the self-absorption is a very efficient heating mechanism for low energy particles, independent of the shape of the particle distribution responsible for the self-absorbed synchrotron emission. We find that the energy gains for low energy particles are always higher than energy losses by cyclo-synchrotron emission. We show also that the spectral index of the self-absorbed part of the spectrum at very low frequencies differs significantly from the well known standard relation I(nu) ~ nu^(5/2).
description: 9 pages, 4 figures, accepted for publication in A&A
Η ιδεολογική τάση του Ιρλανδικού Ρεπουμπλικανισμού 1968-1998:
Creators: name: Λιλιόπουλος, Θωμάς Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Ρεπουμπλικανισμός
Ιρλανδία
Ιδεολογική τάση
Republicanism
Ireland
Ideological tendency

description: Σκοπός της διατριβής ήταν η ανάλυση του Ιρλανδικού Ρεπουμπλικανισμού, όπως αυτός εκδηλώθηκε από το 1968 έως το έτος του 1998, έχοντας ως επίκεντρο την περίπτωση της Βορείου Ιρλανδίας. Εξετάσαμε την ιδεολογική τάση που υπήρξε, τη στρατηγική που εφαρμόστηκε ώστε να επιτευχθούν οι στόχοι που τέθηκαν και τέλος, οι επιπτώσεις και ο αντίκτυπος των αποτελεσμάτων που υπήρξαν, με αφορμή τη Συμφωνία της Μεγάλης Παρασκευής. Επιπροσθέτως, παρουσιάσαμε αναλυτικά το ιδεολογικό υπόβαθρο του Ιρλανδικού Ρεπουμπλικανισμού σε συνδυασμό με τα πολιτικά αιτήματα και τις διεκδικήσεις του. Στη συνέχεια επιχειρήσαμε να εξετάσουμε την κατάληξη που είχε το ζήτημα της Βορείου Ιρλανδίας και στο αν, και σε ποιο βαθμό, οι επιπτώσεις από τη Συμφωνία της Μεγάλης Παρασκευής υπήρξαν καταστροφικές ή όχι για τον Ιρλανδικό Ρεπουμπλικανισμό, όπως αυτός αναπτύχθηκε από τους Καθολικούς της Βόρειας Ιρλανδίας.
description: The aim of the present thesis was the analysis of the Irish Republicanism, such as it was expressed from 1968 to 1998, having as focal point the case of Northern Ireland. We examined the ideological tendency that existed, the strategy that was applied so that are achieved the objectives that were put an end and, the repercussions and the impact of results that existed, on the occasion the Agreement of Big Friday. Furthermore, we presented analytically the ideological background of Irish Republicanism in combination with the political demands and his claims. Afterwards we attempted to examine the conclusion that had the question of Northern Ireland and in whether, and in who degree, the repercussions from the Agreement of Big Friday existed devastating or no for Irish Republicanism, as this was developed by the Catholics of Northern Ireland.
Η αττική δίκη σε κίνηση:
Creators: name: Οικονόμου, Ηλιάνα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: αττική
δίκη
δικονομικό
attic
trial
procedural

description: Σκοπός της παρούσας διπλωματικής εργασίας ήταν η καταγραφή των δικονομικών κανόνων του αττικού δικαίου κατά την κλασική εποχή. Η παρούσα εκκινεί από την καταγραφή και διάκριση των ενδίκων βοηθημάτων και προχωρά στην αναφορά στη δικαιοδοσία και την αρμοδιότητα των Αρχόντων και των Δικαστηρίων. Στη συνέχεια γίνεται αναφορά στην ικανότητα διαδίκων και την ικανότητα δικαστικής παράστασής τους. Ακόμη, γίνεται εκτενής αναφορά σε όλα τα στάδια της προδικασίας και της διαιτητικής επίλυσης της διαφοράς. Στη συνέχεια, εξετάστηκε η διαδικασία συζήτησης των υποθέσεων ενώπιον των δικαστηρίων, η έκδοση της δικαστικής απόφασης, καθώς και οι τρόποι προσβολής αυτής. Τέλος, έγινε αναφορά στον τρόπο εκτέλεση των δικαστικών αποφάσεων, τόσο στις δημόσιες όσο και στις ιδιωτικές δίκες.
description: The aim of this present thesis was the chronicle of the procedural rules of attic law during classical era. The present thesis begins with the listing and differentiation of the legal remedies and continues with the reference to the jurisdiction of Archontes and Dikastiria. Furthermore, there is a reference to the competence of the legal parties. In addition, there is an extent report to all the stages that antedated the procedure before the judges as well as to arbitration procedures. I also examined the procedure before the courts, the issuance of a court order, as well as the ways by which those court orders could be contested. Finally, there is a reference to the ways o court order could be enforced in a public suit as well as in a private one.
Testing the cosmic ray content in galaxy clusters
Creators: name: Marchegiani, P.
name: Perola, G. C.
name: Colafrancesco, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The effective content of cosmic rays (CR) in galaxy clusters remains elusive. This paper aims to estimate a maximum production of both secondary relativistic electrons, SRE, and gamma rays, GR, from the relativistic protons, RP, that have supposedly accumulated throughout the entire history of a cluster. The production rate is normalized by adopting a reference value of 0.3 for the ratio of RP to thermal pressure. The SRE content which obtains, when constrained to reproduce the observed radio brightness profile, yields univocally B(r), if the presence of primary RE were negligible. This procedure is applied to four radio halo clusters (Coma, A2163, A2255, A2319). In these objects, the central value B_0 required is consistent with typical, albeit rather uncertain, values derived from FR. On the other hand, B(r) typically increases beyond the thermal core, a hardly acceptable condition. This problem is alleviated by assuming a mix of SRE and of primary RE, with the latter becoming the dominant component beyond the thermal core. These results suggest that in clusters without a radio halo detected so far a diffuse radio emission should also be observable due to SRE alone, and therefore more centrally condensed. To encourage deeper radio observations of such clusters, some examples were selected that seem rather promising. Efforts in this direction, if accompanied by FR measurements, could provide highly significant constraints on the CR content in clusters, even before the GLAST mission will have accomplished the hard task of detecting the GR. A complementary result concerns the excess far UV in the Coma cluster, that some authors have attributed to IC emission from SRE. It is shown that this hypothesis can be excluded, because it requires a RP energy content in excess of the thermal one.
description: 12 pages, 12 figures; to be published in A&A
WP2A11 Policy brief: Higher education in humanitarian crises: resilience, social inclusion, innovation
Creators: name: Kondratyk, Yurii
name: Gibson, Catherine
name: Beitane, Anna
Publisher: name: Zenodo
Year: 2024
Subjects: citizen engagement
Ukraine
Baltics
HEI
policy brief

description: The policy brief offers recommendations for Higher Education Institutions (HEIs) regarding the organization of citizen engagement activities, drawing from 23 social actions implemented by the Baltics4UA consortium. 

This policy brief was produced as part of Work Package 2 of the EU-funded project Baltics4UA: "Supporting Ukraine through citizen engagement at Baltic Universities'' (https://baltics4ua.eu/, Project Number 2022-2-EE01-KA220-HED-000096422). 

This project has been funded with support from the European Commission. This deliverable reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.
Apresentação/Agradecimento aos revisores
Creators: name: Quintas Mendes, António
name: Pereira, Alda
name: Cardoso, Teresa
Publisher: name: RE@D - Revista de Educação a Distância e Elearning
Year: 2024

description: O Volume 6, número 2, integra um Dossier Temático sobre Inteligência Artificial na Educação e Formação. 


Integra, ainda, um artigo na seção Outros Temas.
description: RE@D - Revista de Educação a Distância e Elearning, Vol. 6 N.º 2 (2023): jul-dez. Inteligência Artificial na Educação e Formação
Far and extreme ultraviolet radiation fields and consequent disc destruction in star-forming regions
Creators: name: Parker, Richard J.
name: Nicholson, Rhana B.
name: Alcock, Hayley L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The first stages of planet formation usually occur when the host star is still in a (relatively) dense star-forming region, where the effects of the external environment may be important for understanding the outcome of the planet formation process. In particular, star-forming regions that contain massive stars have strong far ultraviolet (FUV) and extreme ultraviolet (EUV) radiation fields, which can induce mass-loss from protoplanetary discs due to photoevaporation. In this paper we present a parameter-space study of the expected FUV and EUV fields in N-body simulations of star-forming regions with a range of initial conditions. We then use recently published models to determine the mass-loss due to photoevaporation from protoplanetary discs. In particular, we focus on the effects of changing the initial degree of spatial structure and initial virial ratio in the star-forming regions, as well as the initial stellar density. We find that the FUV fields in star-forming regions are much higher than in the interstellar medium, even when the regions have stellar densities as low as in the Galactic field, due to the presence of intermediate-mass, and massive, stars (>5Msun). These strong radiation fields lead to the destruction of the gas component in protoplanetary discs within 1 Myr, implying that gas giant planets must either form extremely rapidly (<1 Myr), or that they exclusively form in star-forming regions like Taurus, which contain no intermediate-mass or massive stars. The latter scenario is in direct tension with meteoritic evidence from the Solar system that suggests the Sun and its protoplanetary disc was born in close proximity to massive stars.
description: 18 pages (including two short appendices), 6 Fgiures in main paper, accepted for publication in MNRAS
Desafios e Oportunidades da Inteligência Artificial na Educação e na Formação
Creators: name: Santos, Arnaldo
Publisher: name: RE@D - Revista de Educação a Distância e Elearning
Year: 2024

description: Editorial

Dossier temático - Inteligência Artificial na Educação e Formação
description: RE@D - Revista de Educação a Distância e Elearning, Vol. 6 N.º 2 (2023): jul-dez. Inteligência Artificial na Educação e Formação
Ανάλυση ΗΕΓ Μαθηματικών Συγκρίσεων για τον Εντοπισμό Ηλικιακών Διαφορών με Καθιερωμένες Μεθόδους και Τεχνικές Διανυσματικής Κβάντισης:
Creators: name: Αποστολίδης, Κωνσταντίνος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: ΗΕΓ
Συμβολοποίηση
Γνωστικές διεργασίες
EEG
Symbolization
Cognitive-Calculations

description: Στην παρούσα εργασία μελετώνται μαθηματικές δραστηριότητες. Τα υποκείμενα τα οποία έχουν υποβληθεί στην πειραματική διαδικασία προέρχονται από δύο ηλικιακές τάξεις και θα πρέπει να εκτελέσουν μια σύγκριση δύο αριθμών ως προς το μέτρο τους. Επίσης καταγράφηκε και μία κατάσταση ελέγχου σαν σημείο αναφοράς του εγκεφάλου του κάθε υποκειμένου. Σκοπός της παρούσας εργασίας είναι η εύρεση μίας μεθόδου που να μπορεί να διαχωρίσει επιτυχώς τις δύο ηλικιακές ομάδες. Σαν εργαλείο για την εργασία αυτή, πέραν της κλασσικής ανάλυσης της ενέργειας σήματος, υιοθετήθηκε η ανάλυση των χρονοσειρών σε σύμβολα (Symbolic time series analysis). Σύμφωνα με την ανάλυση αυτή αναπτύσσονται μέθοδοι καθορισμού μοτίβων στις χρονοσειρές οι οποίες έχουν καταγραφεί, με στόχο να ανακαλυφθούν κάποιες εσωτερικές τους δομές. Οι δομές αυτές είναι μοναδικές και μπορούν να διαφοροποιήσουν τις χρονοσειρές στις δύο καταστάσεις. Για την επίλυση του συγκεκριμένου προβλήματος αναπτύχθηκε η μέθοδος καθορισμού μοτίβων με την χρήση του αλγορίθμου Neural Gas. Η επιτυχία διαφοροποίησης των καταστάσεων με μεγάλη στατιστική σημαντικότητα αυτής της μεθόδου συγκρίνεται με άλλες μεθόδους όπως την παρατήρηση διαφορών στην ενέργεια του σήματος καθώς και αλλαγών στην οργάνωση δικτύων.
description: In the present study math activities are analyzed. The subjects who have undergone the experimental procedure derived from two age classes and should perform a comparison of two numbers measure. Also there was recorded a resting state signal as a reference dataset in the brain of each subject. The purpose of this study is to find a method that can successfully separate the two age groups. To achieve this, beyond the classical analysis of signal power, the analysis of time series into symbols (Symbolic time series analysis) was adopted. According to this analysis, methods are developed for determining patterns in recorded time series in order to discover some internal structures. These structures are unique and can differentiate the series in two situations. To solve this problem, the method of determining patterns using Neural Gas method was developed. The successful diversification of these states with high statistical significance of this method is compared with other methods such as observation of differences in energy of the signal and changes in the organization of the underlying networks.
Infinite spin limit of semiclassical string states
Creators: name: Minahan, J. A.
name: Tirziu, A.
name: Tseytlin, A. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Motivated by recent works of Hofman and Maldacena and Dorey we consider a special infinite spin limit of semiclassical spinning string states in AdS5 x S5. We discuss examples of known folded and circular 2-spin string solutions and demonstrate explicitly that the 1-loop superstring correction to the classical expression for the energy vanishes in the limit when one of the spins is much larger that the other. We also give a general discussion of this limit at the level of integral equations describing finite gap solutions of the string sigma model and argue that the corresponding asymptotic form of the string and gauge Bethe equations is the same.
description: 38 pages, 3 figures; v2: comments on derivation of bound states of magnons from discrete Bethe equations added in section 4 and appendix C, references added, Imperial-TP-AT-6-4, HUTP-06/A0024
The inner guide: an exploration of biographical patterns
Creators: name: Lozinsky, Miles Rodney
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this study was to explore the pattern of experience with an inner guide within the context of biographical narrative. Despite numerous accounts of how to employ the inner guide as a tool in counselling and how beneficial it may be, there has been little research to inform practice. The aim of this study was to provide a holistic, contextual understanding of inner guidance which would serve as a basis for further understanding of these experiences by counsellors and researchers. This was done by employing a multiple case study design and narrative methodology. Three women, two in their forties and one in her sixties with the appropriate inner guidance experience volunteered to participate. Intensive interviews were conducted, transcribed, analyzed, and presented as individual narratives. Each narrative was then validated by the respective participant and a general narrative pattern was constructed. In this way the meaning and experience of each participant's relationship to her inner guide and the influences between her inner guidance and her life was explored. Findings indicate that the experience of an inner guide was intimate to the very lives as lived, making a holistic research approach indispensable for the investigation of meaning. An implication of this study is to offer clinicians using an inner guide technique a broader understanding of the experience as it relates to an individual's life in a holistic manner.
Η πρόγνωση της συμμετοχής σε άσκηση από τους τύπους απουσίας κινήτρων σε άντρες και γυναίκες:
Creators: name: Θεοχαρίδου, Ευσταθία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Εσωτερικά κίνητρα
Εξωτερικά κίνητρα
Απουσία κινήτρων
Intrinsic motivation
Extrinsic motivation
Amotivation

description: Σκοπός της έρευνας είναι να εξεταστεί η σχέση της απουσίας κινήτρων για άσκηση με τη συχνότητα συμμετοχής αντρών και γυναικών σε προγράμματα ήπιας, μέτριας και έντονης άσκησης. Δεδομένα συλλέχθηκαν από 200 συμμετέχοντες 100 άνδρες και 100 γυναίκες 18-60 ετών, που ασκούνταν σε οργανωμένα προγράμματα άσκησης σε ιδιωτικά και δημοτικά γυμναστήρια. Για την έρευνα χρησιμοποιήθηκαν δύο ερωτηματολόγια. Για να μετρηθούν οι πέντε τύποι απουσίας κινήτρων χρησιμοποιήθηκε το ερωτηματολόγιο απουσίας κινήτρων, (Amotivation Toward Exercise Scale - 2 : Vlachopoulos et al., 2010) ενώ για να εκτιμηθεί η συμπεριφορά στην άσκηση χρησιμοποιήθηκε το ερωτηματολόγιο της φυσικής δραστηριότητας (Godin Leisure Time Exercise Questionnaire: Godin & Shepard, 1985). Για την στατιστική ανάλυση χρησιμοποιήθηκε η γραμμική παλινδρόμηση. Τα αποτελέσματα έδειξαν ότι κανένα είδος κινήτρου δεν συνέβαλε στατιστικώς σημαντικά στην πρόγνωση συμμετοχής αντρών και γυναικών σε προγράμματα ήπιας, μέτριας και έντονης άσκησης. Πιθανά αίτια μπορεί να αποτελούν οι συσχετίσεις της απουσίας κινήτρων με τα εξωτερικά και εσωτερικά κίνητρα και η ύπαρξη μεσολαβητών στη σχέση της απουσίας κινήτρων με την συμπεριφορά της άσκησης.
description: The purpose of the present study was to examine the relationship between amotivation for exercise with frequency of exercise attendance among men and women in mild, moderate, and strenuous exercise. Data were collected by 200 participants, 100 men and 100 women, aged 18-60 years, who participated in organized exercise programs in private, and community fitness centres. Two questionnaires were used for data collection. The Amotivation Toward Exercise Scale - 2 (Vlachopoulos et al., 2010) and the Godin Leisure Time Exercise Questionnaire (Godin & Shepard, 1985). Data were analyzed using multiple regression procedures. It was found that types of multidimensional exercise amotivation did not predict either mild, moderate, or strenuous exercise behavior. Possible reasons include correlations between amotivation with extrinsic and intrinsic motivation and the role of mediating variables in the relationship between amotivation and aspects of exercise behavior.
Solitons and instantons in vacuum stability: physical phenomena
Creators: name: Gonzalez, J. A.
name: Bellorin, A
name: Guerrero, L E
name: Jimenez, S
name: Marin, Juan F
name: Vazquez, L
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a previous paper [JCAP06, 033 (2018)] we have proved that it is possible to have a stable false vacuum in a potential that is unbounded from below. In this paper we discuss the Physics related to our theoretical and numerical results. We show that the results of recent CERN experiments lead to the fact that our vacuum is safe. We present a new mechanism, where the space-time dimension plays an important role, that explains why our Universe is stable. We provide new evidence that supports a process for the origin of matter-antimatter asymmetry recently introduced by other scientists. We examine confinement in the context of escape problems. We discuss multiverse, string theory landscape, and extra-dimensions using our framework. Finally, we use our solutions to introduce some hypotheses about Dark Matter and Dark Energy.
description: Published in Brazilian Journal of Physics, 2020
Twisted Order Parameter applied to Dimerized Ladders
Creators: name: Almeida, J.
name: Martin-Delgado, M. A.
name: Sierra, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We apply the twisted order parameter (TOP) for dimerized quantum spin ladders to locate the critical phases that separate gapped phases representing quantum spin liquids of various types. Using the DMRG, method we find that the TOP is a good order parameter for these systems regardless the number of legs. As a check, we reproduce with DMRG and periodic boundary conditions the computations previously done with Quantum Montecarlo for one-dimensional S=1/2, S=1, S=3/2 and S=2 Heisenberg chains with alternating bonds.
description: Revtex4 file, color figures
Non-Markovian modeling of Fermi-Bose systems coupled to one or several Fermi-Bose thermal baths
Creators: name: Lacroix, Denis
name: Sargsyan, V. V.
name: Adamian, G. G.
name: Antonenko, N. V.
name: Hovhannisyan, A. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A method is proposed to describe Fermi or Bose systems coupled to one or several heat baths composed of fermions and/or bosons. The method, called Coupled Equations of Motion method, properly includes non-Markovian effects. The approach is exact in the Full-Coupling approximation when only bosonic particles are present in the system and baths. The approach provides an approximate treatment when fermions are present either in the system and/or in one or several environments. The new approach has the advantage to properly respect the Pauli exclusion principle for fermions during the evolution. We illustrate the approach for the single Fermi or Bose two-level system coupled to one or two heat-baths assuming different types of quantum statistics (Fermion or Bosons) for them. The cases of Fermi system coupled to fermion or boson heat baths or a mixture of both are analyzed in details. With the future goal to treat Fermi systems formed of increasing number of two-level systems (Qubits), we discuss possible simplifications that could be made in the equations of motion and their limits of validity in terms of the system--baths coupling or of the initial heat baths temperatures.
Η φτώχεια στη σύγχρονη Ελλάδα:
Creators: name: Ζαρώτης, Αστέριος Ευάγγελου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Φτώχεια
Ελλάδα
Οικονομική κρίση
Poverty
Greece
Financial crisis

description: Στην παρούσα διπλωματική εργασία αναλύεται το φαινόμενο της φτώχειας στη σύγχρονη Ελλάδα, δίνοντας έμφαση στην περίοδο μετά το 2008, δηλαδή μετά την εκδήλωση της οικονομικής κρίσης. Η φτώχεια παρουσιάζεται ως ένα πολυδιάστατο φαινόμενο καθώς η έλλειψη χρημάτων αποτελεί μια μόνο πλευρά της. Η ανάλυση των στοιχείων αποδεικνύει ότι το διάστημα 1974-2010 ο αριθμός των φτωχών στις χώρες της Ε.Ε. όχι μόνο παρουσίασε στασιμότητα αλλά και σε ορισμένες μάλιστα χώρες τα ποσοστά των φτωχών αυξήθηκαν. Η Ελλάδα συγκαταλέγεται μεταξύ των χωρών οι οποίες, μετά την εκδήλωση της οικονομικής κρίσης (2008), εμφανίζουν άνοδο στα ποσοστά των φτωχών. Ειδικότερα, το βάρος της φτώχειας επηρεάζει περισσότερο ορισμένα τμήματα του πληθυσμού της Ελλάδας όπως γυναίκες, ανήλικα παιδιά και ηλικιωμένους. Η αύξηση του αριθμού των φτωχών στην Ελλάδα δημιουργεί προβλήματα σε ατομικό αλλά και σε κοινωνικό επίπεδο, αφού διαταράσσεται η κοινωνική συνοχή και δυσχεραίνεται η οικονομική μεγέθυνση και ανάπτυξη της χώρας.
description: The present paper examines the phenomenon of poverty in modern Greece, giving special attention in the period after the outbreak of financial crisis - the period after 2008. The most common characteristic of poverty is the lack of money, but here we do not only focus on this side but also present poverty as a multidimensional phenomenon. Data analysis shows that between 1974- 2010 the number of poor in EU countries not only stagnated but in some countries the percentage of poor increased. Greece belongs in the category of countries that show a rise in the poverty rates, especially after the onset of economic crisis (2008). More specifically, it seems that poverty affects in greater extent some particular parts of Greece's population such as women, children and the elderly. The increasing of the number of poor people in Greece creates problems in individual as well as in social level, as the social cohesion is disturbed and the economic growth and development of the country is hampered.
The origin of the ankle
Creators: name: Codino, Antonio
name: Plouin, Francois
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The differential intensity of cosmic radiation shows a sequence of depressions referred to as "knees" in a large energy band above 10^15 eV. The global depression entailed in the complete spectrum with respect to the extrapolated intensity based on low energy data amounts to a maximum factor of 8, occurring at 5 x 10^18 eV, where flux measurements exhibit a relative minimum, referred to as the "ankle". It is demonstrated by a full simulation of cosmic ray trajectories in the Galaxy that the intensity minimum around the ankle energy is primarily due to the nuclear interactions of the cosmic ions with the interstellar matter and to the galactic magnetic field. "Ankles" signal the onset energies of the rectilinear propagation in the Milky Way at the Earth, being for example, 4 x 10^18 eV for helium and 6 x 10^19 eV for iron. The ankle, in spite of its notable importance at the Earth, is a local perturbation of the universal spectrum which, between the knee and the ankle, decreases by a round factor 10^9, regaining its unperturbed status above 10^19 eV.
description: 10 pages, 11 figures, contribution to the CRIS 2006 Conference