cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Ο οικισμός Καλάμι και το φρούριο Ιτζεδίν: επαναδιαπραγμάτευση δημόσιου οριακού χώρου
title: Kalami residential area and the fortress of Itzedin: renegotiating public liminal space
Creators: name: Καλαιτζαντωνακη Μαρια-Ηλιανα
name: Μπουκουρη Ελενη-Βασιλικη
Publisher: name: Technical University of Crete
Year: 2019

description: Ο τόπος. Ο οικισμός Καλάμι, το οχυρό Ιτζεδίν, η εθνική οδός.

Η διπλωματική αυτή εργασία αποπειράται να μελετήσει, ερμηνεύσει και επιλύσει ζητήματα ένταξης συνθηκών οριακότητας σε άμεση συσχέτιση με τον οικισμό Καλάμι του νομού Χανίων. Ο οικισμός αυτός, ανάμεσα στο ιστορικό φρούριο- φυλακή του Ιτζεδίν και τον Βόρειο Οδικό Άξονα Κρήτης, απέναντι από τη ναυτική βάση του κόλπου της Σούδας και ‘στη σκιά’ του λόφου των Απτέρων, όπου και ο έτερος φρουριακός όγκος της περιοχής, ο Οθωμανικός Κούλες, αναδεικνύεται σε βασικό γνώμονα συγκρότησης προτάσεων, οι οποίες επαναπροσδιορίζουν τον δημόσιο χώρο του, τη γειτνίαση με τον κυκλοφοριακό άξονα και τα προαναφερθέντα οχυρά.

Προτείνονται:
- η ανάδειξη του Ιτζεδίν και η σύζευξή του με τον υπαίθριο δημόσιο χώρο του οικισμού
-η σύζευξη του συνόλου οικισμού- Ιτζεδίν με το λόφο των Απτέρων

 Για την πραγματοποίηση της τελευταίας πρότασης σχεδιάζεται η σύνδεση του οικισμού με τον λόφο μέσω κτιρίου παράλληλα της εθνικής οδού, πεζογέφυρας και περιπατητικής διαδρομής, η οποία προσεγγίζει τα Άπτερα ακολουθώντας υφιστάμενα περάσματα από την απόληξη της γέφυρας προς το φρούριο.
Vollstedt, Barbara: Ovids „Metamorphoses“, „Tristia“ und „Epistulae exPonto“ in Christoph Ransmayrs Roman „Die letzte Welt“
Creators: name: Wölke, Hansjörg
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Vollstedt, Barbara: Ovids „Metamorphoses“, „Tristia“ und „Epistulae exPonto“ in Christoph Ransmayrs Roman „Die letzte Welt“. Paderborn: Schöningh 1998. 201 S.  (Studien zur Geschichte und Kultur des Altertums. N.F. R.1. Bd 13; ISBN3-506-79063-3)
description: Forum Classicum, Nr. 1 (2000): Forum Classicum
title: Σχολή κινηματογράφου και Φωτογραφίας στον Βόλο
title: Volos film and photography school
Creators: name: Κακλαμανης Ορεστης
name: Αιρις-Ασημακοπουλου Φοιβη-Ολιβια
Publisher: name: Technical University of Crete
Year: 2019

description: Η εκπονούμενη διπλωματική με τίτλο: Σχολή κινηματογράφου και Φωτογραφίας στον Βόλο, επιχειρεί τον σχεδιασμό ενός συμπλέγματος εκπαιδευτικών εγκαταστάσεων για τη διδασκαλία των τεχνών της φωτογραφίας και του κινηματογράφου καθώς και των αντίστοιχων υποστηρικτικών υπο-δομών τους.
Η επέμβαση τοποθετείται στην περιοχή "Παλαιά" του Βόλου σε μια μεθόριο περιοχή που βρίσκεται στη Δυτική είσοδο της πόλης παραλαμβάνοντας ισχυρές αστικές, κοινωνικές, λειτουργικές και περιβαλλοντικές αντιθέσεις τις οποίες  η επέμβαση επιχειρεί να διευθετήσει παράλληλα με τον σχεδιασμό ενός απαιτητικού και εξειδικευμένου κτιριολογικού προγράμματος.
A unified Green's function approach for spectral and thermodynamic properties from algorithmic inversion of dynamical potentials
Creators: name: Chiarotti, Tommaso
name: Marzari, Nicola
name: Ferretti, Andrea
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Dynamical potentials appear in many advanced electronic-structure methods, including self-energies from many-body perturbation theory, dynamical mean-field theory, electronic-transport formulations, and many embedding approaches. Here, we propose a novel treatment for the frequency dependence, introducing an algorithmic inversion method that can be applied to dynamical potentials expanded as sum over poles. This approach allows for an exact solution of Dyson-like equations at all frequencies via a mapping to a matrix diagonalization, and provides simultaneously frequency-dependent (spectral) and frequency-integrated (thermodynamic) properties of the Dyson-inverted propagators. The transformation to a sum over poles is performed introducing $n$-th order generalized Lorentzians as an improved basis set to represent the spectral function of a propagator, and using analytic expressions to recover the sum-over-poles form. Numerical results for the homogeneous electron gas at the $G_0W_0$ level are provided to argue for the accuracy and efficiency of such unified approach.
description: Main: 16 pages, 11 figures. Supplemental Material: 4 pages, 10 figures
Stable Conformal Prediction Sets
Creators: name: Ndiaye, Eugene
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Computation (stat.CO)
subject: FOS: Computer and information sciences

description: When one observes a sequence of variables $(x_1, y_1), \ldots, (x_n, y_n)$, Conformal Prediction (CP) is a methodology that allows to estimate a confidence set for $y_{n+1}$ given $x_{n+1}$ by merely assuming that the distribution of the data is exchangeable. CP sets have guaranteed coverage for any finite population size $n$. While appealing, the computation of such a set turns out to be infeasible in general, e.g. when the unknown variable $y_{n+1}$ is continuous. The bottleneck is that it is based on a procedure that readjusts a prediction model on data where we replace the unknown target by all its possible values in order to select the most probable one. This requires computing an infinite number of models, which often makes it intractable. In this paper, we combine CP techniques with classical algorithmic stability bounds to derive a prediction set computable with a single model fit. We demonstrate that our proposed confidence set does not lose any coverage guarantees while avoiding the need for data splitting as currently done in the literature. We provide some numerical experiments to illustrate the tightness of our estimation when the sample size is sufficiently large, on both synthetic and real datasets.
description: Update to ICML version
Extreme spin squeezing for photons
Creators: name: Mitchell, Morgan W.
name: Beduini, Federica A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We apply spin-squeezing techniques to identify and quantify highly multi-partite photonic entanglement in polarization-squeezed light. We consider a practical single-mode scenario, and find that Wineland-criterion polarization squeezing implies entanglement of a macroscopic fraction of the total photons. A Glauber-theory computation of the observable N-photon density matrix, with N up to 100, finds that N-partite entanglement is observable despite losses and without post-selection. We estimate that existing detectors could observe $\sim1000$-partite entanglement from a few dB of polarization squeezing.
description: 18 pages, 5 figures
title: A Generalized Endogenous Grid Method for Default Risk Models
Creators: name: Jang, Youngsoo
name: Lee, Soyoung
Publisher: name: Bank of Canada
Year: 2021

description: "Defaults have been widely observed in financial markets. Researchers use default risk models to better understand the sources of these defaults and the implications of default-related policies. As financial markets and default-related policies have become increasingly complex over time, so have the default risk models.

There are few robust and efficient methods for solving these intricate models. However, despite the increased computational burden and inefficiency, we have relied on the grid-search method for its stability. We propose an extension of the endogenous grid method (EGM), for default risk models. In this method, the debt prices depend on individuals' portfolio positions. We search the regions where EGM can be applied and show how to effectively search the solution in the regions where the EGM cannot be applied. 

Compared with a conventional grid search, our method has similar stability but is faster and more accurate. Specifically, our method is approximately 4 to 7 times faster when applied to a standard model of a sovereign default and approximately 19 to 27 times faster when applied to a richer model. Finally, we show that our method works for a broad class of default risk models."

description: "Les défauts de paiement sont des éventualités abondamment observées sur les marchés financiers. Les chercheurs utilisent des modèles de risque pour mieux comprendre les sources de ces défauts et les implications des politiques visant à les régir. Les marchés financiers et les politiques de réglementation des défaillances s’étant complexifiés au fil du temps, les modèles de risque de défaut sont eux aussi devenus plus complexes.

Il existe peu de méthodes robustes et efficaces permettant de résoudre ces modèles très élaborés. Cependant, même si la recherche par quadrillage exige davantage de calculs et est peu efficace, nous avons eu recours à cette méthode en raison de sa stabilité. Nous proposons d’appliquer aux modèles de risque de défaut une extension de la méthode de recherche par quadrillage à points d’intersection endogènes. Selon cette méthode, le prix des prêts dépend de la situation de l’emprunteur. Nous cherchons les régions où cette méthode peut être appliquée et montrons comment chercher efficacement la solution quand elle n’est pas applicable.

Notre méthode offre une stabilité similaire à la recherche par quadrillage traditionnelle, mais elle est plus rapide et plus juste. Plus précisément, notre méthode est environ 4 à 7 fois plus rapide lorsqu’on l’applique à un modèle standard permettant de déterminer le risque de défaut souverain, et approximativement 19 à 27 fois plus rapide quand on l’applique à un modèle plus riche. Enfin, nous montrons que notre méthode fonctionne pour une vaste gamme de modèles de risque de défaut."
First observations of Mercury's plasma mantle by MESSENGER
Creators: name: DiBraccio, Gina A.
name: Slavin, James A.
name: Raines, Jim M.
name: Gershman, Daniel J.
name: Tracy, Patrick J.
name: Boardsen, Scott A.
name: Zurbuchen, Thomas H.
name: Anderson, Brian J.
name: Korth, Haje
name: McNutt Jr., Ralph L.
name: Solomon, Sean C.
Publisher: name: Columbia University
Year: 2015
Subjects: Planetary science
Solar wind
Magnetosphere
Magnetotails

description: We present the first observations of Mercury's plasma mantle, a primary region for solar wind entry into the planetary magnetosphere, located in the high‐latitude magnetotail. MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) observations from two orbits on 10 November 2012 have been analyzed. The main plasma mantle features are (1) a steady decrease in proton density as MESSENGER moved deeper into the magnetotail; (2) frequent flux transfer events throughout the magnetosheath and into the magnetotail, suggesting that these events are the primary source for solar wind plasma injection; (3) a diamagnetic depression, due to the presence of plasma, as pressure balance is maintained; and (4) a clear proton velocity dispersion, resulting from lower‐energy protons being transported deep into the magnetosphere as higher‐energy protons escape downtail. From these velocity dispersions we infer cross‐magnetosphere electric potentials of 23 kV and 29 kV, consistent with estimates determined from measurements of magnetopause reconnection rate and tail loading and unloading events.
Constructing quantum many-body scar Hamiltonians from Floquet automata
Creators: name: Rozon, Pierre-Gabriel
name: Gullans, Michael J.
name: Agarwal, Kartiek
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We provide a systematic approach for constructing approximate quantum many-body scars (QMBS) starting from two-layer Floquet automaton circuits that exhibit trivial many-body revivals. We do so by applying successively more restrictions that force local gates of the automaton circuit to commute concomitantly more accurately when acting on select scar states. With these rules in place, an effective local, Floquet Hamiltonian is seen to capture dynamics of the automaton over a long prethermal window. We provide numerical evidence for such a picture and use our construction to derive several QMBS models, including the celebrated PXP model.
description: 19.5 pages, 12 figures, 2 tables
Graphical Analysis of Social Group Dynamics
Creators: name: Gliwa, Bogdan
name: Zygmunt, Anna
name: Byrski, Aleksander
Publisher: name: arXiv
Year: 2013
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Identifying communities in social networks becomes an increasingly important research problem. Several methods for identifying such groups have been developed, however, qualitative analysis (taking into account the scale of the problem) still poses serious problems. This paper describes a tool for facilitating such an analysis, allowing to visualize the dynamics and supporting localization of different events (such as creation or merging of groups). In the final part of the paper, the experimental results performed using the benchmark data (Enron emails) provide an insight into usefulness of the proposed tool.
description: Fourth International Conference on Computational Aspects of Social Networks, CASoN 2012, Sao Carlos, Brazil, November 21-23, 2012, pp. 41-46; IEEE Computer Society, 2012
MESSENGER observations of solar energetic electrons within Mercury's magnetosphere
Creators: name: Gershman, Daniel J.
name: Raines, Jim M.
name: Slavin, James A.
name: Zurbuchen, Thomas H.
name: Anderson, Brian J.
name: Korth, Haje
name: Ho, George C.
name: Boardsen, Scott A.
name: Cassidy, Timothy A.
name: Walsh, Brian M.
name: Solomon, Sean C.
Publisher: name: Columbia University
Year: 2015
Subjects: Planetary science
Magnetosphere
Solar energetic particles

description: During solar energetic particle (SEP) events, the inner heliosphere is bathed in MeV electrons. Through magnetic reconnection, these relativistic electrons can enter the magnetosphere of Mercury, nearly instantaneously filling the regions of open field lines with precipitating particles. With energies sufficient to penetrate solid aluminum shielding more than 1 mm thick, these electrons were observable by a number of sensors on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft. Because of its thin shielding, frequent sampling, and continuous temporal coverage, the Fast Imaging Plasma Spectrometer provided by far the most sensitive measurements of MeV electrons of all MESSENGER sensors. Sharp changes in energetic electron flux coincided with topological boundaries in the magnetosphere, including the magnetopause, polar cap, and central plasma sheet. Precipitating electrons with fluxes equal to ~40% of their corresponding upstream levels were measured over the entire polar cap, demonstrating that electron space weathering of Mercury's surface is not limited to the cusp region. We use these distinct precipitation signatures acquired over 33 orbits during 11 SEP events to map the full extent of Mercury's northern polar cap. We confirm a highly asymmetric polar cap, for which the dayside and nightside boundary latitudes range over ~50–70°N and ~30–60°N, respectively. These latitudinal ranges are consistent with average models of Mercury's magnetic field but exhibit a large variability indicative of active dayside and nightside magnetic reconnection processes. Finally, we observed enhanced electron fluxes within the central plasma sheet. Although these particles cannot form a stable ring current around the planet, their motion results in an apparent trapped electron population at low latitudes in the magnetotail.
Unified Origin of Dark Matter Self-Interactions and Low Scale Leptogenesis
Creators: name: Borah, Debasish
name: Dasgupta, Arnab
name: Mahapatra, Satyabrata
name: Sahu, Narendra
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We propose a novel and minimal framework where a light scalar field can give rise to dark matter (DM) self-interactions, while enhancing the CP symmetry required for successful baryon asymmetry of the Universe via leptogenesis route. For demonstration purpose we choose to work in a scotogenic seesaw scenario where the lightest among the right handed neutrinos (RHN), introduced for generating light neutrino masses radiatively, play the role of DM while the heavier two can play non-trivial roles in generating DM relic as well as lepton asymmetry. While dark matter self-interactions mediated by an additional singlet scalar can alleviate the small scale issues of cold dark matter paradigm, the same scalar can give rise to new one-loop decay processes of heavy RHN into standard model leptons providing an enhanced contribution to CP asymmetry, even with sub-TeV scale RHN mass. The thermally under-abundant relic of DM due to large annihilation rates into its light mediator receives a late non-thermal contribution from a heavier RHN. With only five new particles involved in the scotogenic seesaw, each having non-trivial roles in generating DM relic and baryon asymmetry, the model can explain non-zero neutrino mass while being verifiable at different experiments related to DM direct detection, flavour physics and colliders. The mechanism we demonstrated here by using a scotogenic seesaw scenario is also applicable to other models.
description: 9 Pages, 6 Captioned Figures, Version accepted for publication in Phys. Rev. D
Kühne, Jens: Circus Maximus. Lehrwerksunabhängiges Freiarbeits-Lernspiel
Creators: name: Wölke, Hansjörg
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Kühne, Jens: Circus Maximus. Lehrwerksunabhängiges Freiarbeits-Lernspiel. Berlin: Cornelsen 1999. Spielbrett 53 x 36 cm, 4 Gespann-Spielfiguren, 70 Karten, 1 Würfel, Rundenzähler, Spielanleitung. (ISBN 3-464-796949).
description: Forum Classicum, Nr. 1 (2000): Forum Classicum
Bassam Tibi: Kreuzzug und Djihad. Der Islam und die christliche Welt
Creators: name: Meißner, Helmut
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Bassam Tibi: Kreuzzug und Djihad. Der Islam und die christliche Welt. C. Bertelsmann Verlag, München 1999, 319 S.
description: Forum Classicum, Nr. 1 (2000): Forum Classicum
The single-particle space-momentum angle distribution effect on two-pion HBT correlation with the Coulomb interaction
Creators: name: Yang, Hang
name: Feng, Qichun
name: Zhang, Jingbo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the HBT radius Rs for π+ particles with the Coulomb interaction by using the string melting version of a multiphase transport(AMPT) model. We study the relationship between the single-particle space-momentum angle and the particle sources and discuss HBT radii without single-particle space-momentum correlation. Additionally, we study the Coulomb interaction effect on the numerical connection between the single-particle space-momentum angle distribution and the transverse momentum dependence of Rs.
Machine learning of hierarchical clustering to segment 2D and 3D images
Creators: name: Nunez-Iglesias, Juan
name: Kennedy, Ryan
name: Parag, Toufiq
name: Shi, Jianbo
name: Chklovskii, Dmitri B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We aim to improve segmentation through the use of machine learning tools during region agglomeration. We propose an active learning approach for performing hierarchical agglomerative segmentation from superpixels. Our method combines multiple features at all scales of the agglomerative process, works for data with an arbitrary number of dimensions, and scales to very large datasets. We advocate the use of variation of information to measure segmentation accuracy, particularly in 3D electron microscopy (EM) images of neural tissue, and using this metric demonstrate an improvement over competing algorithms in EM and natural images.
description: 15 pages, 8 figures
A new Lagrangian drift mechanism due to current-bathymetry interactions: applications in coastal cross-shelf transport
Creators: name: Gupta, Akanksha
name: Guha, Anirban
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: We show that in free surface flows, a uniform, streamwise current over small-amplitude wavy bottom topography generates cross-stream drift velocity. This drift mechanism, referred to as the current-bathymetry interaction induced drift (CBIID), is specifically understood in the context of a simplified nearshore environment consisting of a uniform alongshore current, onshore propagating surface waves, and monochromatic wavy bottom making an oblique angle with the shoreline. CBIID is found to originate from the steady, non-homogeneous solution of the governing system of equations. Similar to Stokes drift induced by surface waves, CBIID also generates a compensating Eulerian return flow to satisfy the no-flux lateral boundaries, e.g. the shoreline. CBIID increases with an increase in the particle's initial depth, bottom undulation's amplitude, and the strength of the alongshore current. Additionally, CBIID near the free (bottom) surface increases (decreases) with an increase in bottom undulation's wavelength. Maximum CBIID is obtained for long wavelength bottom topography that approximately makes $π/4$ angle with the shoreline. Unlike Stokes drift, particle excursions due to current-bathymetry interactions might not be small, hence analytical expressions based on the small-excursion approximation could be inaccurate. We provide an alternative $z$-bounded approximation, which leads to highly accurate expressions for drift velocity and time period of particles especially located near the free surface. Realistic parametric analysis reveals that in some nearshore environments, CBIID's contribution to the net Lagrangian drift can be as important as Stokes drift, implying that CBIID can have major implications in cross-shelf tracer transport.
MESSENGER observations of suprathermal electrons in Mercury's magnetosphere
Creators: name: Ho, George C.
name: Starr, Richard D.
name: Krimigis, Stamatios M.
name: Vandegriff, Jon D.
name: Baker, Daniel N.
name: Gold, Robert E.
name: Anderson, Brian J.
name: Korth, Haje
name: Schriver, David
name: McNutt Jr., Ralph L.
name: Solomon, Sean C.
Publisher: name: Columbia University
Year: 2016
Subjects: Planetary science
Planets--Magnetospheres

description: The X‐Ray Spectrometer (XRS) on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging spacecraft regularly detected fluorescent X‐rays near Mercury induced by low‐energy (1–10 keV) or suprathermal electrons. We devised an algorithm to select these events from XRS records between April 2011 and March 2015 on the basis of their duration, location, and spectral slope. We identified 3102 events during 3900 orbits around Mercury, sampling all Mercury longitudes multiple times over the 4 year period. These suprathermal electrons were present near the planet at all local times, but the majority were on the nightside of the planet, and a dawn‐dusk asymmetry is seen in the data. When the event locations are plotted in a coordinate system based on a simplified magnetic field model, several distinct clusters of events are evident. We infer that all are signatures of accelerated electrons that were injected from Mercury's tail region to form a quasi‐trapped electron population at Mercury.
Das Wechselspiel von Mythos und Logos. Die Dialektik der griechischen Aufklärung als europäisches Paradigma. Ein Lesebuch für den Philosophieunterricht in Europa. Hrsg. von Luise Dreyer unter Mitarb. v. Georges Goedert u. Maria Muck
Creators: name: Scheffel, Wolfgang
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Das Wechselspiel von Mythos und Logos. Die Dialektik der griechischen Aufklärung als europäisches Paradigma. Ein Lesebuch für den Philosophieunterricht in Europa. Hrsg. von Luise Dreyer unter Mitarb. v. Georges Goedert u. Maria Muck. Frankfurt/Main: Diesterweg 1998. 239 S. (ISBN 3-425-05597-6).
description: Forum Classicum, Nr. 2 (2000): Forum Classicum
Meister, Klaus: Einführung in die Interpretation historischer Quellen. Schwerpunkt Antike. Bd 2.
Creators: name: Stratenwerth, Dietrich
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Meister, Klaus: Einführung in die Interpretation historischer Quellen. Schwerpunkt Antike. Bd 2. Rom. Paderborn (usw.): Schöningh 1999. 397 S. (UTB Wissenschaft. 2056; ISBN 3-506-99508-1).
description: Forum Classicum, Nr. 2 (2000): Forum Classicum
title: Zagrożenia cybernetyczne dla młodego użytkownika sieci w perspektywie rozwoju społeczeństwa informacyjnego
title: Cyber Threats to a Young Internet User in the Perspective of the Development of the Information Society
Creators: name: Jopek, Anita
name: Kinda, Magdalena
Publisher: name: Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego „Apeiron” w Krakowie
Year: 2019

description: Development of the information society includes not only the expansion of the Internet network or use of new technologies in people’s lives, but also a wide range of previously unknown challenges and threats which in many cases, because of their cybernetic nature, may seem unrealistic. Yet, they pose serious threats to the safety of Internet users, in particular adolescents, who often do not understand the risks involved and become victims, or perpetrators, of cyber pathology. Information and communication technologies are inseparable elements of the life of a young person, which is why it is so important to study this new area of the functioning of adolescents in order to protect them from new dangers. The article shows the results of a survey conducted in 2017 by one of the authors. The study aimed to investigate the scale of the development of new technologies and their role in young people’s life.
Hyperspectral Image Denoising Using Non-convex Local Low-rank and Sparse Separation with Spatial-Spectral Total Variation Regularization
Creators: name: Peng, Chong
name: Liu, Yang
name: Chen, Yongyong
name: Wu, Xinxin
name: Cheng, Andrew
name: Kang, Zhao
name: Chen, Chenglizhao
name: Cheng, Qiang
Publisher: name: arXiv
Year: 2022
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this paper, we propose a novel nonconvex approach to robust principal component analysis for HSI denoising, which focuses on simultaneously developing more accurate approximations to both rank and column-wise sparsity for the low-rank and sparse components, respectively. In particular, the new method adopts the log-determinant rank approximation and a novel $\ell_{2,\log}$ norm, to restrict the local low-rank or column-wisely sparse properties for the component matrices, respectively. For the $\ell_{2,\log}$-regularized shrinkage problem, we develop an efficient, closed-form solution, which is named $\ell_{2,\log}$-shrinkage operator. The new regularization and the corresponding operator can be generally used in other problems that require column-wise sparsity. Moreover, we impose the spatial-spectral total variation regularization in the log-based nonconvex RPCA model, which enhances the global piece-wise smoothness and spectral consistency from the spatial and spectral views in the recovered HSI. Extensive experiments on both simulated and real HSIs demonstrate the effectiveness of the proposed method in denoising HSIs.
The low‐degree shape of Mercury
Creators: name: Perry, Mark E.
name: Neumann, Gregory A.
name: Phillips, Roger J.
name: Ernst, Carolyn M.
name: Kahan, Daniel S.
name: Solomon, Sean C.
name: Zuber, Maria T.
name: Smith, David E.
name: Hauck II, Steven A.
name: Peale, Stanton J.
name: Margot, Jean-Luc
name: Mazarico, Erwan
name: Johnson, Catherine L.
name: Gaskell, Robert W.
name: Roberts, James H.
name: McNutt Jr., Ralph L.
name: Oberst, Juergen
Publisher: name: Columbia University
Year: 2015
Subjects: Planetary science
Planets--Geology
Planets--Internal structure

description: The shape of Mercury, particularly when combined with its geoid, provides clues to the planet's internal structure, thermal evolution, and rotational history. Elevation measurements of the northern hemisphere acquired by the Mercury Laser Altimeter on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging spacecraft, combined with 378 occultations of radio signals from the spacecraft in the planet's southern hemisphere, reveal the low‐degree shape of Mercury. Mercury's mean radius is 2439.36 ± 0.02 km, and there is a 0.14 km offset between the planet's centers of mass and figure. Mercury is oblate, with a polar radius 1.65 km less than the mean equatorial radius. The difference between the semimajor and semiminor equatorial axes is 1.25 km, with the long axis oriented 15° west of Mercury's dynamically defined principal axis. Mercury's geoid is also oblate and elongated, but it deviates from a sphere by a factor of 10 less than Mercury's shape, implying compensation of elevation variations on a global scale.
title: Przyczyny oraz konsekwencje występowania zaburzeń psychicznych u żołnierzy biorących udział w misjach
title: Causes and Consequences of the Occurrence of Mental Disorders in Soldiers Participating in Missions
Creators: name: Anna, Lisowska
Publisher: name: Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego „Apeiron” w Krakowie
Year: 2019

description: Soldiers who take part in foreign missions are extremely vulnerable to traumatic events related to their duties. Pre-departure training should cover not only areas directly related to actions at the front, but also psychological preparation and the possible consequences of long-term stress and traumatic events. Such exercises could then help soldiers minimize the effects of experiences they have had in the conflict region. Soldiers should have wider access to psychological help so as to be able to solve problems related to mental disorders on an ongoing basis. Different aspects of stress should be taken into account, not just those closely related with warfare on the battlefield.
RXTE and SWIFT Observations of SWIFT J1729.9-3437
Creators: name: Sahiner, S.
name: Inam, S. C.
name: Serim, M. M.
name: Baykal, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We analyze \emph{RXTE} and \emph{Swift} observations of SWIFT J1729.9$-$3437 after its outburst from 2010 July 20 to 2010 August 12. We calculate a spin frequency and spin frequency derivative of $1.8734(8) \times 10^{-3}$ Hz and $6.42(6) \times 10^{-12}$ Hz/s respectively from the quadratic fit of pulse arrival times. The quadratic fit residuals fit well to a circular orbital model with a period of $15.3(2)$ days and a mass function of about $1.3M_{\odot}$, but they can also be explained by a torque noise strength of $6.8 \times 10^{-18}$ Hz sec$^{-2}$. Pulse profiles switches from double-peaked to single-peaked as the source flux continues to decrease. We find that the pulse shape generally shows no strong energy dependence. The hardness ratios reveal that the source becomes softer with decreasing flux. We construct a single spectrum from all the available RXTE and Swift observations. We find that adding an \emph{Fe} line complex feature around 6.51 keV slightly improves the spectral fit and that this feature is more likely to originate from the source rather than the Galactic ridge. From the pulse phase spectral analysis, it is shown that that photon index and folding energy of the high energy cut-off vary with varying pulse phase.
description: 15 pages, 9 figures, accepted for publication in MNRAS
Tc-rich M stars: platypuses of low-mass star evolution
Creators: name: Shetye, Shreeya
name: Van Eck, Sophie
name: Jorissen, Alain
name: Siess, Lionel
name: Goriely, Stephane
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The technetium-rich (Tc-rich) M stars reported in the literature (Little-Marenin & Little (1979); Uttenthaler et al. (2013)) are puzzling objects since no isotope of technetium has a half-life longer than a few million years, and 99Tc, the longest-lived isotope along the s-process path, is expected to be detected only in thermally-pulsing stars enriched with other s-process elements (like zirconium). Carbon should also be enriched, since it is dredged up at the same time, after each thermal pulse on the asymptotic giant branch (AGB). However, these Tc-enriched objects are classified as M stars, meaning that they neither have any significant zirconium enhancement (otherwise they would be tagged as S-type stars) nor any large carbon overabundance (in which case they would be carbon stars). Here we present the first detailed chemical analysis of a Tc-rich M-type star, namely S Her. We first confirm the detection of the Tc lines, and then analyze its carbon and s-process abundances, and draw conclusions on its evolutionary status. Understanding these Tc-rich M stars is an important step to constrain the threshold luminosity for the first occurrence of the third dredge-up and the composition of s-process ejecta during the very first thermal pulses on the AGB.
description: 6 pages, 3 figures, Under review for 'The origin of outflows in evolved stars Proceedings IAU Symposium No. 366, 2021'
title: Σύστημα προσομοίωσης εκτέλεσης αλγορίθμων συνάθροισης δεδομένων με χρήση Google Maps
Creators: name: Σεληνιωτάκη Αλέκα
Publisher: name: Technical University of Crete
Year: 2011

description: Μη διαθέσιμο
Detecting Directionality in Random Fields Using the Monogenic Signal
Creators: name: Olhede, Sofia
name: Ramírez, David
name: Schreier, Peter J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Detecting and analyzing directional structures in images is important in many applications since one-dimensional patterns often correspond to important features such as object contours or trajectories. Classifying a structure as directional or non-directional requires a measure to quantify the degree of directionality and a threshold, which needs to be chosen based on the statistics of the image. In order to do this, we model the image as a random field. So far, little research has been performed on analyzing directionality in random fields. In this paper, we propose a measure to quantify the degree of directionality based on the random monogenic signal, which enables a unique decomposition of a 2D signal into local amplitude, local orientation, and local phase. We investigate the second-order statistical properties of the monogenic signal for isotropic, anisotropic, and unidirectional random fields. We analyze our measure of directionality for finite-size sample images, and determine a threshold to distinguish between unidirectional and non-unidirectional random fields, which allows the automatic classification of images.
Disk Tearing Leads to Low and High Frequency Quasi Periodic Oscillations in a GRMHD Simulation of a Thin Accretion Disk
Creators: name: Musoke, G.
name: Liska, M.
name: Porth, O.
name: van der Klis, M.
name: Ingram, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Black hole X-ray binaries (BHXRBs) display a wide range of variability phenomena, from long duration spectral state changes to short-term broadband variability and quasi-periodic oscillations (QPOs). A particularly puzzling aspect is the production of QPOs, which -- if properly understood -- could be used as a powerful diagnostic tool of black hole accretion and evolution. In this work we analyse a high resolution three-dimensional general relativistic magnetohydrodynamic simulation of a geometrically thin accretion disk which is tilted by $65^{\circ}$ with respect to the black hole spin axis. We find that the Lense-Thirring torque from the rapidly spinning 10 $M_\odot$ black hole causes several sub-disks to tear off within $\sim 10-20$ gravitational radii. Tearing occurs in cycles on timescales of seconds. During each tearing cycle the inner sub-disk precesses for 1-5 periods before it falls into the black hole. We find a precession frequency of $\sim 3\rm Hz$, consistent with observed low-frequency QPOs. In addition, we find a high frequency QPO (HFQPO) with centroid frequency of $\sim55$Hz in the power spectra of the mass-weighted radius of the inner disk. This signal is caused by radial epicyclic oscillations of a dense ring of gas at the tearing radius, which strongly suggests a corresponding modulation of the X-ray lightcurve and may thus explain some of the observed HFQPOs.
description: submitted to MNRAS
title: Imperfect Banking Competition and Macroeconomic Volatility: A DSGE Framework
Creators: name: Li, Jiaqi
Publisher: name: Bank of Canada
Year: 2021

description: "The banking sector tends to be dominated by a few large players. With this imperfect competition, banks can charge a markup on their loan rate, which increases the cost of borrowing for firms. If this markup increases during an economic downturn, the impact of an unfavourable shock to the economy will be amplified. Therefore, it is important to understand how banks adjust their loan rate markup in response to macroeconomic shocks.

This paper reveals a new mechanism behind the time-varying loan rate markup in a dynamic stochastic general equilibrium framework. When the expected return from investing in capital increases, firms are more willing to borrow to finance their purchase. The greater willingness to borrow implies that firms are less sensitive to the loan rate. Banks with market power then respond to the price-insensitive demand for loans by charging a higher loan rate markup.

I find that banks adjust their loan rate markup differently in response to different macroeconomic shocks. After a contractionary monetary policy shock, the loan rate markup increases and thus raises macroeconomic volatility. In contrast, after a productivity shock, it is less clear how the loan rate markup is affected, because the duration of the shock is an influencing factor."

description: "Le secteur bancaire est généralement dominé par une poignée de grands joueurs. En raison de cette concurrence imparfaite, les banques peuvent appliquer une majoration aux taux d’intérêt de leurs prêts, ce qui fait monter les coûts d’emprunt des entreprises. Et si elles augmentent cette majoration en cas de choc économique négatif, les effets de ce choc seront amplifiés. Il est donc important de comprendre comment les banques ajustent la majoration des taux d’intérêt de leurs prêts en réponse aux chocs macroéconomiques.

À l’aide d’un modèle d’équilibre général dynamique et stochastique, je révèle un nouveau mécanisme derrière la variation de la majoration du taux d’intérêt des prêts dans le temps. Lorsque le rendement attendu d’un investissement en capital augmente, les entreprises sont plus disposées à emprunter pour financer leur achat, laissant supposer qu’elles sont alors moins sensibles au taux des prêts. Les banques qui détiennent un pouvoir de marché réagissent donc à cette demande de prêts insensible aux prix en augmentant la majoration qu’elles appliquent à leurs taux.

Je constate que les banques ajustent la majoration des taux d’intérêt de leurs prêts différemment en fonction des chocs macroéconomiques. Après un choc restrictif de politique monétaire, l’ajustement se fait à la hausse, ce qui accroît la volatilité macroéconomique. Par contre, les chocs de productivité n’ont pas une incidence aussi claire sur la majoration, car leur durée est un facteur déterminant."
Pair potentials and equation of state of solid parahydrogen to megabar pressure
Creators: name: Omiyinka, Tokunbo
name: Boninsegni, Massimo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We compute by means of Quantum Monte Carlo simulations the equation of state of bulk solid {para}hydrogen extrapolated to zero temperature, up to a pressure of ~ 2 MBar. We compare the equation of state yielded by three different pair potentials, namely the Silvera-Goldman, Buck and one recently proposed by Moraldi, modified at short distances to include a repulsive core, missing in the originally proposed potential. The Moraldi pair potential yields an equation of state in very good agreement with experiment at megabar pressures, owing to its softer core, and is at least as accurate as the SG or the Buck at saturated vapour pressure. Estimates for the experimentally measurable kinetic energy per molecule are provided for all pair potentials.
description: 6 pages, 5 figures in color
Key points in the determination of the interfacial Dzyaloshinskii-Moriya interaction from asymmetric bubble domain expansion
Creators: name: Magni, A.
name: Carlotti, G.
name: Casiraghi, A.
name: Darwin, E.
name: Durin, G.
name: Diez, L. Herrera
name: Hickey, B. J.
name: Huxtable, A.
name: Hwang, C. Y.
name: Jakob, G.
name: Kim, C.
name: Kläui, M.
name: Langer, J.
name: Marrows, C. H.
name: Nembach, H. T.
name: Ravelosona, D.
name: Riley, G. A.
name: Shaw, J. M.
name: Sokalski, V.
name: Tacchi, S.
name: Kuepferling, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Different models have been used to evaluate the interfacial Dzyaloshinskii-Moriya interaction (DMI) from the asymmetric bubble expansion method using magneto-optics. Here we investigate the most promising candidates over a range of different magnetic multilayers with perpendicular anisotropy. Models based on the standard creep hypothesis are not able to reproduce the domain wall (DW) velocity profile when the DW roughness is high. Our results demonstrate that the DW roughness and the interface roughness of the sample layers are correlated. Furthermore, we give guidance on how to obtain reliable results for the DMI value with this popular method. A comparison of the results with Brillouin light scattering (BLS) measurements on the same samples shows that the BLS approach often results in higher measured values of DMI.
Pursuing 3D Scene Structures with Optical Satellite Images from Affine Reconstruction to Euclidean Reconstruction
Creators: name: Wang, Pinhe
name: Shi, Limin
name: Chen, Bao
name: Hu, Zhanyi
name: Dong, Qiulei
name: Qiao, Jianzhong
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: How to use multiple optical satellite images to recover the 3D scene structure is a challenging and important problem in the remote sensing field. Most existing methods in literature have been explored based on the classical RPC (rational polynomial camera) model which requires at least 39 GCPs (ground control points), however, it is not trivial to obtain such a large number of GCPs in many real scenes. Addressing this problem, we propose a hierarchical reconstruction framework based on multiple optical satellite images, which needs only 4 GCPs. The proposed framework is composed of an affine dense reconstruction stage and a followed affine-to-Euclidean upgrading stage: At the affine dense reconstruction stage, an affine dense reconstruction approach is explored for pursuing the 3D affine scene structure without any GCP from input satellite images. Then at the affine-to-Euclidean upgrading stage, the obtained 3D affine structure is upgraded to a Euclidean one with 4 GCPs. Experimental results on two public datasets demonstrate that the proposed method significantly outperforms three state-of-the-art methods in most cases.
description: 11 pages, 5 figures
Toolkit for Scalar Fields in Universes with finite-dimensional Hilbert Space
Creators: name: Friedrich, Oliver
name: Singh, Ashmeet
name: Doré, Olivier
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The holographic principle suggests that the Hilbert space of quantum gravity is locally finite-dimensional. Motivated by this point-of-view, and its application to the observable Universe, we introduce a set of numerical and conceptual tools to describe scalar fields with finite-dimensional Hilbert spaces, and to study their behaviour in expanding cosmological backgrounds. These tools include accurate approximations to compute the vacuum energy of a field mode $\mathbf{k}$ as a function of the dimension $d_{\mathbf{k}}$ of the mode Hilbert space, as well as a parametric model for how that dimension varies with $|\mathbf{k}|$. We show that the maximum entropy of our construction momentarily scales like the boundary area of the observable Universe for some values of the parameters of that model. And we find that the maximum entropy generally follows a sub-volume scaling as long as $d_{\mathbf{k}}$ decreases with $|\mathbf{k}|$. We also demonstrate that the vacuum energy density of the finite-dimensional field is dynamical and decays between two constant epochs in our fiducial construction. These results rely on a number of non-trivial modelling choices, but our general framework may serve as a starting point for future investigations of the impact of finite-dimensionality of Hilbert space on cosmological physics.
description: 22 pages + appendix; public code available at github.com/OliverFHD/GPUniverse
Gamma Rays from Bino-like Dark Matter in the MSSM
Creators: name: Kumar, Jason
name: Sandick, Pearl
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider regions of the parameter space of the Minimal Supersymmetric Standard Model (MSSM) with bino-like neutralino dark matter in which a large fraction of the total dark matter annihilation cross section in the present era arises from annihilation to final states with monoenergetic photons. The region of interest is characterized by light sleptons and heavy squarks. We find that it is possible for the branching fraction to final states with monoenergetic photons to be comparable to that for continuum photons, but in those cases the total cross section will be so small that it is unlikely to be observable. For models where dark matter annihilation may be observable in the present era, the branching fraction to final states with monoenergetic photons is O(1-10%).
description: 10 pages, 3 figures. V2: minor updates, references added. V3: Matches published version
Zu Thomas Brückner/Gunther Scheda: Zur Lage des Altsprachlichen Unterrichts, Abschnitt 4 (Forum Classicum 2/2000, S. 82)
Creators: name: Epping, Andreas
Publisher: name: Forum Classicum
Year: 2017

description: -
description: Forum Classicum, Nr. 3 (2000): Forum Classicum