cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Χρηματοοικονομική Ανάλυση Τραπεζικών Ιδρυμάτων την Περίοδο 2007-2011
Creators: name: Κωστοπούλου, Νικολέτα Χαράλαμπου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Χρηματοοικονομική κρίση
Αριθμοδείκτες
Κεφαλαιακή επάρκεια
Financial analysis
Ratios
Capital adequacy

description: Σκοπός της παρούσας εργασίας είναι η ανάλυση των χρηματοοικονομικών καταστάσεων των πέντε πιο αντιπροσωπευτικών τραπεζικών ιδρυμάτων της χώρας, της Εθνικής Τράπεζας, της Alpha Bank, της Eurobank Ergasias, της Τράπεζας Πειραιώς και της Εμπορικής Τράπεζας κατά την περίοδο 2007-2011. Τα στοιχεία που χρησιμοποιήθηκαν αντλήθηκαν από τις δημοσιευμένες ατομικές οικονομικές καταστάσεις των τραπεζών και τους αριθμοδείκτες που εξήχθησαν. Το βασικό εύρημα της μελέτης ήταν ότι η χρηματοοικονομική κρίση που επικράτησε τόσο στην Ελλάδα όσο και την Ευρωζώνη έπληξε άμεσα το χρηματοπιστωτικό σύστημα της χώρας καθώς οι τράπεζες κλήθηκαν να διενεργήσουν περαιτέρω προβλέψεις για την εξασφάλισή τους έναντι του πιστωτικού κινδύνου γεγονός που είχε άμεσο αντίκτυπο στα επίπεδα κερδοφορίας και κεφαλαιακής τους επάρκειας.
description: The purpose of this paper is the financial analysis of the five most representative greek banks, National Bank of Greece, Alpha Bank, Eurobank Ergasias, Pireus Bank and Emporiki Bank during the period 2007-2011. Data were obtained from the published financial statements and through the calculated financial ratios. The main finding of the paper is that Greek banks have been highly affected by the financial crisis and this is supported by the highly reported provisions for credit risk which have resulted in the decrease in their net results.
Analytic solution of the two-star model with correlated degrees
Creators: name: Bolfe, Maíra
name: Metz, Fernando L.
name: Guzmán-González, Edgar
name: Castillo, Isaac Pérez
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Exponential random graphs are important to model the structure of real-world complex networks. Here we solve the two-star model with degree-degree correlations in the sparse regime. The model constraints the average correlation between the degrees of adjacent nodes (nearest neighbors) and between the degrees at the end-points of two-stars (next nearest neighbors). We compute exactly the network free energy and show that this model undergoes a first-order transition to a condensed phase. For non-negative degree correlations between next nearest neighbors, the degree distribution inside the condensed phase has a single peak at the largest degree, while for negative degree correlations between next nearest neighbors the condensed phase is characterized by a bimodal degree distribution. We calculate the degree assortativities and show they are non-monotonic functions of the model parameters, with a discontinuous behavior at the first-order transition. The first-order critical line terminates at a second-order critical point, whose location in the phase diagram can be accurately determined. Our results can help to develop more detailed models of complex networks with correlated degrees.
description: 13 pages, 11 figures
Ελληνορωσικές σχέσεις: η γλωσσική εκπαιδευτική πολιτική του ελληνικού κράτους για τους παλιννοστούντες από την πρώην Σοβιετική Ενωση
Creators: name: Οικονόμου, Αγγελική Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Παλιννόστηση
Σοβιετική Ενωση
Γλωσσικές πολιτικές
Repatriation
Soviet Union
Linguistic politics

description: Η Ελλάδα θεωρείται μία από τις ευρωπαϊκές χώρες με τη μεγαλύτερη μετανάστευση πληθυσμών κατά τη διάρκεια του 19ου και 20ου αιώνα που δημιουργήθηκαν μεγάλες παροικίες στις χώρες όπου βρέθηκαν. Από το 1970 κι έπειτα, και κυρίως στα τέλη της δεκαετίας του 1980, η Ελλάδα μετατρέπεται σε χώρα υποδοχής παλιννοστούντων αλλά και αλλοδαπών μεταναστών με έντονο το φαινόμενο του επαναπατρισμού Ελληνοποντίων που ζούσαν στην πρώην Σοβιετική Ένωση, την Υπερκαυκασία και την Κεντρική Ασία. Αυτή η παλιννόστηση δημιούργησε την ανάγκη προσαρμογής του ελληνικού σχολείου και της ελληνικής κοινωνίας στην καινούρια πραγματικότητα. Θα δούμε αρχικά τους λόγους που οδήγησαν σε αυτή την παλιννόστηση και στη συνέχεια τις γλωσσικές εκπαιδευτικές πολιτικές της Ελλάδας για τους παλιννοστούντες και κατ’ επέκταση για όλους τους μετανάστες.
description: Greece is considered as one of the European countries with the biggest emigration current during the 19th and the 20th centuries. Big communities were founded there where they arrived. Since 1970 and mostly at the end of 1980 decade, Greece has turned into a host country for repatriated and foreigners immigrants. The phenomenon of repatriation of Pontic-greeks living in Soviet Union, Transcaucasia end Central Asia has been very intense. This repatriation created a need for adjustment from Greek school and society inner the new reality. Firstly, we will present the reasons leading to this repatriation and afterwards we will see the linguistic politics of Greece for the repatriated and the immigrants.
description: Συνεργαζόμενα Τμήματα Πανεπιστήμιο Λε Μαν (Γαλλία)
Magnetodynamic properties of dipole-coupled 1D magnonic crystals
Creators: name: Singh, Suraj
name: Wang, Xiansi
name: Kumar, Ankit
name: Qaiumzadeh, Alireza
name: Svedlindh, Peter
name: Tybell, Thomas
name: Wahlström, Erik
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Magnonic crystals are magnetic metamaterials, that provide a promising way to manipulate magnetodynamic properties by controlling the geometry of the patterned structures. Here, we study the magnetodynamic properties of 1D magnonic crystals consisting of parallel NiFe strips with different strip widths and separations. The strips couple via dipole-dipole interactions. As an alternative to experiments and/or micromagnetic simulations, we investigate the accuracy of a simple macrospin model. For the case of simple strips, a model with a single free parameter to account for an overestimation of the out-of-plane demagnetization of the magnonic lattice is described. By adjusting this parameter a good fit with experimental as well as micromagnetic results is obtained. Moreover, the Gilbert damping is found independent of the lattice constant however the inhomogeneous linewidth broadening found to increase with decreasing stripe separation.
High-brilliance ultra-narrow-band x-rays via electron radiation in colliding laser pulses
Creators: name: Lv, Q. Z.
name: Raicher, E.
name: Keitel, C. H.
name: Hatsagortsyan, K. Z.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: A setup of a unique x-ray source is put forward employing a relativistic electron beam interacting with two counter-propagating laser pulses in the nonlinear few-photon regime. In contrast to Compton scattering sources, the envisaged x-ray source exhibits an extremely narrow relative bandwidth of the order of $10^{-4}$, comparable with an x-ray free-electron laser (XFEL). The brilliance of the x-rays can be an order of magnitude higher than that of a state-of-the-art Compton source. By tuning the laser intensities and the electron energy, one can realize either a single peak or a comb-like x-ray source of around keV energy. The laser intensity and the electron energy in the suggested setup are rather moderate, rendering this scheme compact and table-top size, as opposed to XFEL and synchrotron infrastructures.
description: 7 pages, 4 figures
DroneTrap: Drone Catching in Midair by Soft Robotic Hand with Color-Based Force Detection and Hand Gesture Recognition
Creators: name: Fedoseev, Aleksey
name: Serpiva, Valerii
name: Karmanova, Ekaterina
name: Cabrera, Miguel Altamirano
name: Shirokun, Vladimir
name: Vasilev, Iakov
name: Savushkin, Stanislav
name: Tsetserukou, Dzmitry
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The paper proposes a novel concept of docking drones to make this process as safe and fast as possible. The idea behind the project is that a robot with a soft gripper grasps the drone in midair. The human operator navigates the robotic arm with the ML-based gesture recognition interface. The 3-finger robot hand with soft fingers is equipped with touch sensors, making it possible to achieve safe drone catching and avoid inadvertent damage to the drone's propellers and motors. Additionally, the soft hand is featured with a unique color-based force estimation technology based on a computer vision (CV) system. Moreover, the visual color-changing system makes it easier for the human operator to interpret the applied forces. Without any additional programming, the operator has full real-time control of the robot's motion and task execution by wearing a mocap glove with gesture recognition, which was developed and applied for the high-level control of DroneTrap. The experimental results revealed that the developed color-based force estimation can be applied for rigid object capturing with high precision (95.3\%). The proposed technology can potentially revolutionize the landing and deployment of drones for parcel delivery on uneven ground, structure maintenance and inspection, risque operations, and etc.
description: Published in: 2021 IEEE 4th International Conference on Soft Robotics (RoboSoft), https://ieeexplore.ieee.org/document/9479353, IEEE copyright, "(c) 20XX IEEE...", 7 pages, 15 figures
Are Bohmian trajectories real? On the dynamical mismatch between de Broglie-Bohm and classical dynamics in semiclassical systems
Creators: name: Matzkin, A.
name: Nurock, V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The de Broglie-Bohm interpretation of quantum mechanics aims to give a realist description of quantum phenomena in terms of the motion of point-like particles following well-defined trajectories. This work is concerned by the de Broglie-Bohm account of the properties of semiclassical systems. Semiclassical systems are quantum systems that display the manifestation of classical trajectories: the wavefunction and the observable properties of such systems depend on the trajectories of the classical counterpart of the quantum system. For example the quantum properties have a regular or disordered aspect depending on whether the underlying classical system has regular or chaotic dynamics. In contrast, Bohmian trajectories in semiclassical systems have little in common with the trajectories of the classical counterpart, creating a dynamical mismatch relative to the quantum-classical correspondence visible in these systems. Our aim is to describe this mismatch (explicit illustrations are given), explain its origin, and examine some of the consequences on the status of Bohmian trajectories in semiclassical systems. We argue in particular that semiclassical systems put stronger constraints on the empirical acceptability and plausibility of Bohmian trajectories because the usual arguments given to dismiss the mismatch between the classical and the de Broglie-Bohm motions are weakened by the occurrence of classical trajectories in the quantum wavefunction of such systems.
description: Figures downgraded to low resolution. V2:Minor changes
Determining Neutrino and Supernova Parameters with a Galactic Supernova
Creators: name: Skadhauge, Solveig
name: Funchal, Renata Zukanovich
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the sensitivity of some of the proposed next-generation neutrino experiments to a galactic supernova. In particular, we study how well the supernova parameters (the average energies and luminosities) can be separated from the unknown neutrino oscillation parameters ($θ_{13}$ and the neutrino mass hierarchy). Three types of experiments, all in the 100-kton class, are compared. These are: a 540 kton water-Cherenkov detector, a 100 kton liquid Argon detector and a 50 kton scintillator detector. We demonstrate that practically all of these proposed detectors have the possibility to determine the hierarchy of the neutrino masses if the angle $θ_{13}$ is sufficiently large ($\sin^2(θ_{13}) > 10^{-4}$) and the hierarchy of the average energies is larger than about 20%. They can at the same time determine some of the supernova parameters well. The average energy of the $ν_μ$ and $ν_τ$ species can be determined within 5% uncertainty in most of the parameter space suggested by supernova simulations. The detection of several separable channels measuring different combinations of charged current and neutral current processes is crucial for determining the value of $θ_{13}$ and the hierarchy. However, there are cases where a few of the SN parameters can be determined rather well even if only the main charged current detection channel is available.
description: 44 pages, 13 figures. Appendix added and improvements in text. Matches published version
Stanley Conjecture in small embedding dimension
Creators: name: Anwar, Imran
name: Popescu, Dorin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: Primary 13P10, Secondary 13H10, 13F20, 13C14

description: We show that Stanley's conjecture holds for a polynomial ring over a field in four variables. In the case of polynomial ring in five variables, we prove that the monomial ideals with all associated primes of height two, are Stanley ideals.
description: 5 pages
Monte Carlo simulation of metal deposition on foreign substrates
Creators: name: Gimenez, M. Cecilia
name: Ramirez-Pastor, Antonio J.
name: Leiva, Ezequiel P. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The deposition of a metal on a foreign substrate is studied by means of grand canonical Monte Carlo simulations and a lattice-gas model with pair potential interactions between nearest neighbors. The influence of temperature and surface defects on adsorption isotherms and differential heat of adsorption is considered. The general trends can be explained in terms of the relative interactions between adsorbate atoms and substrate atoms. The systems Ag/Au(100), Ag/Pt(100), Au/Ag(100) and Pt/Ag(100) are analyzed as examples.
description: 26 pages, 9 figures
ПЕРЕХОД В СИТУАЦИЮ РЕАЛЬНОГО ОБЩЕНИЯ НА УРОКАХ РУССКОГО ЯЗЫКА В СПЕЦИАЛИЗИРОВАННЫХ ШКОЛАХ
Creators: name: Ходжаханова, Мунира
Publisher: name: Zenodo
Year: 2024

description: Современная методология преподавания русского языка акцентирует внимание на важности использования реальных коммуникативных ситуаций для формирования и развития языковых навыков у учащихся. В специализированных школах, где обучаются дети с особыми образовательными потребностями, данный подход становится особенно значимым, так как способствует более эффективной социализации и адаптации учеников. Реальное общение в учебном процессе стимулирует развитие как когнитивных, так и эмоциональных аспектов обучения.
Additional file 1 of Establishment of an ovarian cancer omentum metastasis-related prognostic model by integrated analysis of scRNA-seq and bulk RNA-seq
Creators: name: Zhang, Dongni
name: Lu, Wenping
name: Cui, Shasha
name: Mei, Heting
name: Wu, Xiaoqing
name: Zhuo, Zhili
Publisher: name: figshare
Year: 2022
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1.
Dependence on beam energy and nuclear equation of state dependence of anisotropic flow and particle production in low-energy heavy-ion collisions
Creators: name: Kundu, Sumit Kumar
name: Bailung, Yoshini
name: Rode, Sudhir Pandurang
name: Bhaduri, Partha Pratim
name: Roy, Ankhi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyse various flow coefficients of anisotropic momentum distribution of final state particles in mid-central ($b$ $=$ 5--9 $fm$) Au + Au collisions in the beam energy range $\rm E_{\rm Lab}$ $=$ $1A -158A$ GeV. Different variants of the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model, namely the pure transport (cascade) mode and the hybrid mode, are employed for this investigation. In the hybrid UrQMD model, the ideal hydrodynamical evolution is integrated with the pure transport calculation for description of the evolution of the fireball. We opt for the different available equations of state (EoS) replicating the hadronic as well as partonic degrees of freedom together with possible phase transitions, viz. hadron gas, chiral + deconfinement EoS and bag model EoS, to investigate their effect on the properties of the final state particles. We also attempt to gain insights about the dynamics of the medium by studying different features of particle production such as particle ratios and net-proton rapidity distribution. The results and conclusions drawn here would be useful to understand the response of various observables to the underlying physics of the model as well as to make comparisons with the upcoming measurements of the future experiments at Facility for Antiproton and Ion Research (FAIR) and Nuclotron-based Ion Collider fAcility (NICA).
description: 14 pages, 12 figures
Ενδεχόμενος δόλος-Ενσυνείδητη αμέλεια-Πολύνεκρα δυστυχήματα
Creators: name: Τσαπαλιάνα, Χριστίνα Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Δόλος
Αμέλεια
Υπαιτιότητα
Intention
Recklessness
Culpability

description: Σκοπός της διπλωματικής ήταν η μελέτη των απόψεων που υποστηρίζονται για τη διάκριση του ενδεχόμενου δόλου από την ενσυνείδητη αμέλεια στα πολύνεκρα δυστυχήματα. Εξετάσαμε τρεις νομολογιακές υποθέσεις, στις οποίες ανέκυψαν προβλήματα στην ανωτέρω διάκριση. Στη συνέχεια παρουσιάσαμε αναλυτικά τις απόψεις που έχουν υποστηριχθεί τόσο στην ξένη έννομη τάξη όσο και στην ελληνική για το πώς διακρίνονται οι δύο μορφές υπαιτιότητας. Ακόμη αναφερθήκαμε αναλυτικά στις προσπάθειες προς ανεύρεση μιας λύσης. Ένα άλλο θέμα που θίξαμε ήταν τα κριτήρια διάγνωσης του ενδεχόμενου δόλου.
description: The aim of the present thesis was the study of the views supported about the distinction of potential intention by recklessly in deadly accidents. We examined three jurisprudential cases in which problems arose about this distinction. Then we presented in detail the views that have been supported by both the foreign legal system and by Greek on how the two types of culpability are distinguished. Also examined in detail the efforts are given to find a solution. Another issue that we raised was the criteria for diagnosis of potential intention.
Boundary electromagnetic duality from homological edge modes
Creators: name: Mathieu, Philippe
name: Teh, Nicholas J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recent years have seen a renewed interest in using `edge modes' to extend the pre-symplectic structure of gauge theory on manifolds with boundaries. Here we further the investigation undertaken in \cite{FP2018} by using the formalism of homotopy pullback and Deligne-Beilinson cohomology to describe an electromagnetic (EM) duality on the boundary of $M=B^{3}\times\mathbb{R}$. Upon breaking a generalized global symmetry, the duality is implemented by a BF-like topological boundary term. We then introduce Wilson line singularities on $\partial M$ and show that these induce the existence of dual edge modes, which we identify as connections over a $\left(-1\right)$-gerbe. We derive the pre-symplectic structure that yields the central charge in \cite{FP2018} and show that the central charge is related to a non-trivial class of the $\left(-1\right)$-gerbe.
description: Version 2: Some minor typos corrected, some references added, Appendix C rephrased, provided with more indicative figures. Version 3: Some minor typos corrected, Appendix D added
On Recovering Continuum Topology from a Causal Set
Creators: name: Major, Seth
name: Rideout, David
name: Surya, Sumati
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: An important question that discrete approaches to quantum gravity must address is how continuum features of spacetime can be recovered from the discrete substructure. Here, we examine this question within the causal set approach to quantum gravity, where the substructure replacing the spacetime continuum is a locally finite partial order. A new topology on causal sets using ``thickened antichains'' is constructed. This topology is then used to recover the homology of a globally hyperbolic spacetime from a causal set which faithfully embeds into it at sufficiently high sprinkling density. This implies a discrete-continuum correspondence which lends support to the fundamental conjecture or ``Hauptvermutung'' of causal set theory.
description: The statement of a lemma has been simplified and the proof rewritten. Errors have been corrected. One figure has been removed. All results remain unchanged. Accepted for publication in JMP. 31 pages, 4 figs
Reciprocal relativity of noninertial frames: quantum mechanics
Creators: name: Low, Stephen G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81R05, 81R60, 83E99, 83A05, 51N25

description: Noninertial transformations on time-position-momentum-energy space {t,q,p,e} with invariant Born-Green metric ds^2=-dt^2+dq^2/c^2+(1/b^2)(dp^2-de^2/c^2) and the symplectic metric -de/\dt+dp/\dq are studied. This U(1,3) group of transformations contains the Lorentz group as the inertial special case. In the limit of small forces and velocities, it reduces to the expected Hamilton transformations leaving invariant the symplectic metric and the nonrelativistic line element ds^2=dt^2. The U(1,3) transformations bound relative velocities by c and relative forces by b. Spacetime is no longer an invariant subspace but is relative to noninertial observer frames. Born was lead to the metric by a concept of reciprocity between position and momentum degrees of freedom and for this reason we call this reciprocal relativity. For large b, such effects will almost certainly only manifest in a quantum regime. Wigner showed that special relativistic quantum mechanics follows from the projective representations of the inhomogeneous Lorentz group. Projective representations of a Lie group are equivalent to the unitary reprentations of its central extension. The same method of projective representations of the inhomogeneous U(1,3) group is used to define the quantum theory in the noninertial case. The central extension of the inhomogeneous U(1,3) group is the cover of the quaplectic group Q(1,3)=U(1,3)*s H(4). H(4) is the Weyl-Heisenberg group. A set of second order wave equations results from the representations of the Casimir operators.
Relativistic causality in particle detector models: Faster-than-light signalling and "Impossible measurements"
Creators: name: de Ramón, José
name: Papageorgiou, Maria
name: Martín-Martínez, Eduardo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze potential violations of causality in Unruh DeWitt-type detector models in relativistic quantum information. We proceed by first studying the relation between faster-than-light signaling and the causal factorization of the dynamics for multiple detector-field interactions. We show in what way spatially extended non-relativistic detector models predict superluminal propagation of the field's initial conditions. We draw parallels between this characteristic of detector models, stemming from their non-relativistic dynamics, and Sorkin's "impossible measurements on quantum fields" arXiv:gr-qc/9302018. Based on these features, we discuss the validity of measurements in QFT when performed with non-relativistic particle detectors.
description: 10 pages, 2 figures, 1 appendix. RevTeX 4.1. v2: some minor typos corrected
Magnesium Isotopes in Metal-Poor Dwarfs, the Rise of AGB Stars and the Formation Timescale of the Galactic Halo
Creators: name: Melendez, Jorge
name: Cohen, Judith G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have determined magnesium isotopic ratios (^{25,26}Mg/Mg) in metal-poor (-2.6 [Fe/H] -1.3) halo dwarfs employing high S/N (90-280) high spectral resolution (R = 10^5) Keck HIRES spectra. Unlike previous claims of an important contribution from intermediate-mass AGB stars at low metallicities, we find that the rise of the AGB contribution in the Galactic halo did not occur until intermediate metallicities ([Fe/H] ~> -1.5).
description: ApJ Letters, in press
Bulk Comptonization spectra in blazars
Creators: name: Celotti, Annalisa
name: Ghisellini, Gabriele
name: Fabian, Andrew C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the time dependent spectra produced via the bulk Compton process by a cold, relativistic shell of plasma moving (and accelerating) along the jet of a blazar, scattering on external photons emitted by the accretion disc and reprocessed in the broad line region. Bulk Comptonization of disc photons is shown to yield a spectral component contributing in the far UV band, and would then be currently unobservable. On the contrary, the bulk Comptonization of broad line photons may yield a significant feature in the soft X-ray band. Such a feature is time-dependent and transient, and dominates over the non thermal continuum only when: a) the dissipation occurs close to, but within, the broad line region; b) other competing processes, like the synchrotron self-Compton emission, yield a negligible flux in the X-ray band. The presence of a bulk Compton component may account for the X-ray properties of high redshift blazars that show a flattening (and possibly a hump) in the soft X-rays, previously interpreted as due to intrinsic absorption. We discuss why the conditions leading to a detectable bulk Compton feature might be met only occasionally in high redshift blazars, concluding that the absence of such a feature in the spectra of most blazars should not be taken as evidence against matter--dominated relativistic jets. The detection of such a component carries key information on the bulk Lorentz factor and kinetic energy associated to (cold) leptons.
description: 8 pages; 4 figures; MNRAS, accepted
Αρχές της Νέας Αγωγής και του Εκπαιδευτικού Δημοτικισμού στα Αναγνωστικά βιβλία της περιόδου 1917- 1920
Creators: name: Κουγιουμτζή, Ευαγγελία Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Νέα Αγωγή
Αναγνωστικά Βιβλία
Δημοτικό
Progressive Education
Reader Books
Primary school

description: Σκοπός της εργασίας ήταν η ανάλυση των τεσσάρων από τα δεκατρία αναγνωστικά που εισήχθησαν στο Δημοτικό κατά την περιόδο 1917-1920, υπο το πρίσμα της Νέας Αγωγής και του Εκπαιδευτικού Δημοτικισμού. Ως μέθοδος της παρούσας εργασίας χρησιμοποιήθηκε η ποιοτική ανάλυση περιεχομένου, σύμφωνα με την οποία μελετήθηκαν τα εξής αναγνωστικά: «Το Αλφαβητάρι με τον Ήλιο», «Αλφαβητάριο Α΄ μέρος», «Τα Ψηλά Βουνά» και «Αναγνωστικό Γ΄ Δημοτικού».
description: The aim of this paper was the analysis of the four out of thirteen reader books which had been introduced in the primary school in the period 1917-1920, in the light of progressive education and educational demotic. As the main method of the present work, it was used the qualitative content analysis in accordance with which the following readers were studied: «Το Αλφαβητάρι με τον Ήλιο»,(abc- book with the sun) «Αλφαβητάριο Α΄ μέρος»(abc- book part A΄), «Τα Ψηλά Βουνά»(the high moyntains) και «Αναγνωστικό Γ΄ Δημοτικού»(reader book third class of primary school).
Three-agent Time-constrained Cooperative Pursuit-Evasion
Creators: name: Sinha, Abhinav
name: Kumar, Shashi Ranjan
name: Mukherjee, Dwaipayan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: Multiagent Systems (cs.MA)
subject: Robotics (cs.RO)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: This paper considers a pursuit-evasion scenario among three agents -- an evader, a pursuer, and a defender. We design cooperative guidance laws for the evader and the defender team to safeguard the evader from an attacking pursuer. Unlike differential games, optimal control formulations, and other heuristic methods, we propose a novel perspective on designing effective nonlinear feedback control laws for the evader-defender team using a time-constrained guidance approach. The evader lures the pursuer on the collision course by offering itself as bait. At the same time, the defender protects the evader from the pursuer by exercising control over the engagement duration. Depending on the nature of the mission, the defender may choose to take an aggressive or defensive stance. Such consideration widens the applicability of the proposed methods in various three-agent motion planning scenarios such as aircraft defense, asset guarding, search and rescue, surveillance, and secure transportation. We use a fixed-time sliding mode control strategy to design the control laws for the evader-defender team and a nonlinear finite-time disturbance observer to estimate the pursuer's maneuver. Finally, we present simulations to demonstrate favorable performance under various engagement geometries, thus vindicating the efficacy of the proposed designs.
description: The most recent version of this article can be viewed at https://doi.org/10.1007/s10846-022-01570-y
Disorder Enhanced Spin Polarization in Diluted Magnetic Semiconductors
Creators: name: Lee, Byounghak
name: Cartoixa, Xavier
name: Trivedi, Nandini
name: Martin, Richard M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a theoretical study of diluted magnetic semiconductors that includes spin-orbit coupling within a realistic host band structure and treats explicitly the effects of disorder due to randomly substituted Mn ions. While spin-orbit coupling reduces the spin polarization by mixing different spin states in the valence bands, we find that disorder from Mn ions enhances the spin polarization due to formation of ferromagnetic impurity clusters and impurity bound states. The disorder leads to large effects on the hole carriers which form impurity bands as well as hybridizing with the valence band. For Mn doping 0.01 < x < 0.04, the system is metallic with a large effective mass and low mobility.
Authority and justification : the case of Thomas Hobbes
Creators: name: MacDonald, David Ross
Publisher: name: University of British Columbia
Year: 2009

description: This thesis reviews the concept of authority in general and critically examines the justification for authority offered by Hobbes. The first chapter aims to develop a particular conception of authority based on a distinction drawn by Joseph Raz between first and second order reasons for action. This conception construes the suspension of judgement that obedience to authority is typically said to entail in terms of binding second order reasons for action which serve to pre-empt individuals’ contrary first order reasons. On this view, authority consists in the right to issue and enforce such second order reasons, or laws. In the second chapter Hobbes’s justification for authority is considered. The theory is presented in its own right before Hobbes’ s’ conclusions are examined in light of the above mentioned conception of authority. This examination reveals an inconsistency in Hobbes’s theory with respect to the right to rule. Hobbes’ s understands this right as the unimpeded natural right of the sovereign, however, the argument is here submitted that insofar as it entails enforcement of a system of second order reasons, the right to rule is unlike any right that could exist in the state of nature. Insofar as it entails a right to enforce punitive sanctions for violations of authoritative second order reasons for action the right to rule is essentially a new right. In concluding, the theoretical implications of this inconsistency in Hobbes are considered and the suggestion is made that Hobbes’ s normative assumptions better support a “service conception” of government than his own right-based conception.
The XMM Cluster Survey: A Massive Galaxy Cluster at z=1.45
Creators: name: Stanford, S. A.
name: Romer, A. K.
name: Sabirli, K.
name: Davidson, M.
name: Hilton, M.
name: Viana, P. T. P.
name: Collins, C. A.
name: Kay, S. T.
name: Liddle, A. R.
name: Mann, R. G.
name: Miller, C. J.
name: Nichol, R. C.
name: West, M. J.
name: Conselice, C. J.
name: Spinrad, H.
name: Stern, D.
name: Bundy, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of XMMXCS J2215.9-1738, a massive galaxy cluster at z =1.45, which was found in the XMM Cluster Survey. The cluster candidate was initially identified as an extended X-ray source in archival XMM data. Optical spectroscopy shows that 6 galaxies within a 60 arcsec diameter region lie at z = 1.45 +/- 0.01. Model fits to the X-ray spectra of the extended emission yield kT = 7.4 (+2.7,-1.8) keV (90 % confidence); if there is an undetected central X-ray point source then kT = 6.5 (+2.6,-1.8) keV. The bolometric X-ray luminosity is Lx = 4.4 (+0.8,-0.6) x 10^44 ergs/s over a 2 Mpc radial region. The measured Tx, which is the highest known for a cluster at z > 1, suggests that this cluster is relatively massive for such a high redshift. The redshift of XMMXCS J2215.9-1738 is the highest currently known for a spectroscopically-confirmed cluster of galaxies.
description: Accepted for publication in the The Astrophysical Journal Letters. 5 pages, 5 figures
The Magneto-coulomb effect in spin valve devices
Creators: name: van der Molen, S. J.
name: Tombros, N.
name: van Wees, B. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We discuss the influence of the magneto-coulomb effect (MCE) on the magnetoconductance of spin valve devices. We show that MCE can induce magnetoconductances of several per cents or more, dependent on the strength of the coulomb blockade. Furthermore, the MCE-induced magnetoconductance changes sign as a function of gate voltage. We emphasize the importance of separating conductance changes induced by MCE from those due to spin accumulation in spin valve devices.
description: This paper includes 3 figures
Η συμμετοχή του θεατή στην ελληνική τέχνη του ΄70
Creators: name: Γκουντάρας, Ηρακλής Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Θεατής
Έργο τέχνης
Αλληλεπίδραση
Spectator
Work of art
Interaction

description: Σκοπός της διπλωματικής εργασίας είναι η μελέτη ενός φαινομένου της σύγχρονης τέχνης, μέσα από το οποίο αναδείχτηκε μια καινούργια σχέση ανάμεσα στη παραγωγή και θέαση του έργου τέχνης. Πιο συγκεκριμένα, μελετήσαμε το ρόλο του θεατή και τις δυνατότητες να συμμετάσχει ενεργά στην εικαστική διαδικασία. Αρχικά έγινε μια αναδρομή στη θέση που κατείχε ιστορικά ο δέκτης σε σχέση με το έργο τέχνης και στη συνέχεια εξετάστηκε η αλληλεπίδραση πομπού και δέκτη στις ιστορικές πρωτοπορίες του Μοντερνισμού. Επίσης μελετήσαμε το ιστορικό κλίμα που επικράτησε μεταπολεμικά σε διεθνές επίπεδο και τη διατύπωση μιας σειράς θεωρητικών μοντέλων, τα οποία άσκησαν έντονη κριτική στους παραδοσιακούς διαχωρισμούς μεταξύ καλλιτέχνη-έργου τέχνης-θεατή. Στο κυρίως μέρος της εργασίας ασχοληθήκαμε με την ελληνική τέχνη του εβδομήντα και την προσπάθεια πολλών εκπροσώπων της να συγχρονιστούν με τα γενικότερα αιτήματα της εποχής, ανάμεσα στα οποία ήταν και η αφύπνιση του κοινού. Μέσα από τη μελέτη του ιστορικού κλίματος της εποχής και την εξέταση συγκεκριμένων ελλήνων καλλιτεχνών αναδείχθηκε η συμμετοχή του θεατή σε αντισυμβατικές μορφές εικαστικής έκφρασης, όπως τα Χάπενινγκ, οι Δράσεις και τα Περιβάλλοντα. Στο τέλος επιχειρήθηκε μια μικρή αποτίμηση των συνεπειών αυτού του φαινομένου στη μετέπειτα πορεία και εξέλιξη της σύγχρονης τέχνης.
description: This study is an inquiry around the particular aspect of contemporary art through which, a new relationship emerged between art and its spectatorship. Specifically, the role of the spectator and the potentiality of an active engagement with the procedures of art production was a pivot point of the discussion. In order to better address this relationship, we delved into the historically constructed ‘proximity’ between spectator and art object. Also, their interaction within the gulfs of Modernity was another element we took into consideration. The transnational post-war climate on the one hand and the theoretical models on the other were equally of utmost importance to this direction since they had a determining effect on the traditional relationship between artist/art object and art/spectator. Following the aforementioned theoretical investigation, the cornerstone of the discussion was Greek Art of the 1970’s and the attempts of its representatives to follow up with the demands of an era that exceeded national borders and concerned public awakening. Thus, through the study of particular artists’ work of the period we pinpointed the public participation to non-comformist forms of art expression, such as Happenings, Actions, Environments. Lastly, we attempted a short evaluation of how the redefined relationship between spectator/art has impacted upon the evolution of contemporary art.
The Maxwell Lagrangian in purely affine gravity
Creators: name: Poplawski, Nikodem J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The purely affine Lagrangian for linear electrodynamics, that has the form of the Maxwell Lagrangian in which the metric tensor is replaced by the symmetrized Ricci tensor and the electromagnetic field tensor by the tensor of homothetic curvature, is dynamically equivalent to the Einstein-Maxwell equations in the metric-affine and metric formulation. We show that this equivalence is related to the invariance of the Maxwell Lagrangian under conformal transformations of the metric tensor. We also apply to a purely affine Lagrangian the Legendre transformation with respect to the tensor of homothetic curvature to show that the corresponding Legendre term and the new Hamiltonian density are related to the Maxwell-Palatini Lagrangian for the electromagnetic field. Therefore the purely affine picture, in addition to generating the gravitational Lagrangian that is linear in the curvature, justifies why the electromagnetic Lagrangian is quadratic in the electromagnetic field.
description: 9 pages; published version
Quasi-Two-Dimensional Extraordinary Hall Effect
Creators: name: Ryzhanova, N.
name: Vedyayev, A.
name: Pertsova, A.
name: Dieny, B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Quasi-two-dimensional transport is investigated in a system consisting of one ferromagnetic layer placed between two insulating layers. Using the mechanism of skew-scattering to describe the Extraordinary Hall Effect (EHE) and calculating the conductivity tensor, we compare the quasi- two-dimensional Hall resistance with the resistance of a massive sample. In this study a new mechanism of EHE (geometric mechanism of EHE) due to non-ideal interfaces and volume defects is also proposed.
description: 14 pages, 5 figures; typos corrected in thickness units (figures 1-5)
Reconstruction of Rb-Rb inter-atomic potential from ultracold Bose-gas collision
Creators: name: Schumayer, Dániel
name: Melchert, Oliver
name: Scheid, Werner
name: Apagyi, Barnabás
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Scattering phase shifts obtained from 87Rb Bose-gas collision experiments are used to reconstruct effective potentials resulting, self-consistently, in the same scattering events observed in the experiments at a particular energy. We have found that the interaction strength close to the origin suddenly changes from repulsion to attraction when the collision energy crosses, from below, the l=2 shape resonance position at E = 275 mikroK. This observation may be utilized in outlining future Bose-gas collision experiments.
description: 4 pages, 4 figures
Restoration of QCD classical symmetries in excited hadrons
Creators: name: Glozman, L. Ya.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Restoration of chiral and $U(1)_A$ symmetries in excited hadrons is reviewed. A connection of these restorations with the semiclassical regime in highly excited hadron is discussed. A solvable confining field-theoretical toy model that exhibits chiral restoration is presented. Implications of the string description of the highly excited hadrons that suggests an additional dynamical symmetry of the spectra on the top of $U(2)_L \times U(2)_R$ are presented.
description: 7 pp. Plenary talk given at the Int. Conf. "Quark Confinement and the Hadron Spectrum VII", Ponta Delgada, Azores, September 2-7, 2006 and at the Symposium "Quantum Chromodynamics: Facts and Prospects", Oberwoelz, Austria, September 10-16, 2006
Supersymmetric NLO QCD Corrections to Resonant Slepton Production and Signals at the Tevatron and the LHC
Creators: name: Dreiner, H. K.
name: Grab, S.
name: Krämer, M.
name: Trenkel, M. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compute the total cross section and the transverse momentum distribution for single charged slepton and sneutrino production at hadronic colliders including NLO supersymmetric and non-supersymmetric QCD corrections. The supersymmetric QCD corrections can be substantial. We also resum the gluon transverse momentum distribution and compare our results with two Monte Carlo generators. We compute branching ratios of the supersymmetric decays of the slepton and determine event rates for the like-sign dimuon final state at the Tevatron and at the LHC.
description: 14 pages, LaTeX, 8 figures, uses REVTex4
Decuplet contribution to the meson-baryon scattering lengths
Creators: name: Liu, Yan-Rui
name: Zhu, Shi-Lin
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate decuplet contributions to the s-wave pseudoscalar meson octet-baryon scattering lengths to the third order in heavy baryon chiral perturbation theory (HB$χ$PT). Using experimental pion-nucleon and kaon-nucleon scattering lengths as inputs, we determine low-energy constants and predict other meson-baryon scattering lengths. Numerically we consider three cases: (1) the case with only baryon octet contributions; (2) with decuplet contributions and (3) in the large N_c limit. Hopefully, the analytical expressions and the predictions are helpful to future investigations of the meson-baryon scattering lengths.
description: 11 pages, 1 figure, 9 tables
Internal dynamics of the massive cluster Abell 697: a multiwavelength analysis
Creators: name: Girardi, M.
name: Boschin, W.
name: Barrena, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We conduct an intensive study of the rich, X-ray luminous, and hot galaxy cluster Abell 697 (at z=0.282), likely containing a diffuse radio emission, to determine its dynamical status. Our analysis is based on new spectroscopic data obtained at the TNG telescope for 93 galaxies and on new photometric data obtained at the INT telescope. We combine galaxy velocity and position information to select 68 cluster members, determine global dynamical properties, and detect possible substructures. The investigation of the dynamical status is also performed by using X-ray data stored in the Chandra archive. We compute the line-of-sight (LOS) velocity dispersion of galaxies, sigma_v=1334 km s^-1, in agreement with the high average X-ray temperature T_X=10.2 keV recovered from Chandra data. Assuming that the cluster is in dynamical equilibrium and mass follows the galaxy distribution, we find that A697 is a very massive cluster obtaining M(
description: 17 pages, 11 eps figures, A&A accepted
Simulating nonlinear neutrino flavor evolution
Creators: name: Duan, Huaiyu
name: Fuller, George M.
name: Carlson, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss a new kind of astrophysical transport problem: the coherent evolution of neutrino flavor in core collapse supernovae. Solution of this problem requires a numerical approach which can simulate accurately the quantum mechanical coupling of intersecting neutrino trajectories and the associated nonlinearity which characterizes neutrino flavor conversion. We describe here the two codes developed to attack this problem. We also describe the surprising phenomena revealed by these numerical calculations. Chief among these is that the nonlinearities in the problem can engineer neutrino flavor transformation which is dramatically different than in standard Mikheyev-Smirnov-Wolfenstein treatments. This happens even though the neutrino mass-squared differences are measured to be small, and even when neutrino self-coupling is sub-dominant. Our numerical work has revealed potential signatures which, if detected in the neutrino burst from a Galactic core collapse event, could reveal heretofore unmeasurable properties of the neutrinos, such as the mass hierarchy and vacuum mixing angle theta_13.
description: 25 pages, 6 figures. Links to simulations movies are embedded