cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Αριθμητική και πειραματική μελέτη της υδροδυναμικής πλωτού κυματοθραύστη
Creators: name: Κουτάντος, Ευάγγελος Βασ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Ελαστική αγκύρωση
Ανάκλαση κυματισμών
Διάδοση κυματισμών
Σκέδαση κυματικής ενέργειας
Elastic anchoring systems
Wave reflection
Wave transmission
Wave energy dissipation

description: Στη συγκεκριμένη διδακτορική διατριβή διερευνάται αριθμητικά και πειραματικά η υδροδυναμική πλωτού κυματοθραύστη και η επίδρασή του στη διαμόρφωση των κυματισμών. Το αριθμητικό ομοίωμα κυματισμών βασίζεται στις εξισώσεις Boussinesq και εφαρμόζεται σε ρηχά και ενδιαμέσου βάθους ύδατα. Παρουσιάζεται σύζευξη του κυματικού ομοιώματος με διδιάστατο κατακόρυφα ελλειπτικό επιλύτη για τον προσδιορισμό των πιέσεων που ασκούνται στηνν πλωτή κατασκευή. Η προσομοίωση ελαστικής αγκύρωσης επιτυγχάνεται με τη χρήση ισοδύναμων ελατηριακών σταθερών. Με χρήση της αρχής της επαλληλίας επιλύεται το πλήρες δυναμικό πρόβλημα. Η μεγάλης κλίμακας πειραματική μελέτη έγινε στο κανάλι κυματισμών CIEM του πανεπιστημίου UPC της Βαρκελώνης. Εξετάστηκαν διάφοροι τύποι πλωτού κυματοθραύστη (σταθερός, με ελευθερία κατακόρυφης κίνησης, με συμπαγές-διάτρητο παραπέτασμα, διπλός). Σε κάθε περίπτωση εξετάζεται η διάδοση, ανάκλαση και σκέδαση της κυματικής ενέργειας παρουσία της κατασκευής. Παρουσιάζεται φασματική ανάλυση μονοχρωματικών τυχαίων κυματισμών, παρουσία της κατασκευής όπως επίσης και διαμόρφωση των πιέσεων και κατακόρυφων δυνάμεων που ασκούνται σε αυτήν. Τελικά διαμορφώνονται κατασκευαστικές οδηγίες.
description: In the specific doctoral dissertation the hydrodynamics of a floating breakwater is examined numerically and experimentally along with the final impact on the wave filed. The numerical model is based on the Boussinesq type equation and it is implemented in shallow and intermediate waters. The coupling of the I-D wave model with a ZDV elliptic solver is presented for the determination of the pressure acting on the floating structure. The simulation of the elastic anchoring system is achieved using equivalent spring coefficients. The full dynamic problem is solved using the linear superposition assumption. The large scale experimental study was conducted in Ciem wave flume in UPC university in Barcelona. Different types of floating breakwater were examined (fixed, in unrestrained wave motion, with attached solid-"porons" plate, double). In every case the wave energy transmission-reflection and dissipation are examined in the vicinity of the structure. Spectral analysis of monochromatic-random waves in the presence of the floating breakwater along with the evolution of the pressure and the vertical force acting on it are presented. Finally design guidelines are formulated and proposed.
Upper large deviations for the maximal flow in first passage percolation
Creators: name: Théret, Marie
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K35

description: We consider the standard first passage percolation in $\mathbb{Z}^{d}$ for $d\geq 2$ and we denote by $ϕ_{n^{d-1},h(n)}$ the maximal flow through the cylinder $]0,n]^{d-1} \times ]0,h(n)]$ from its bottom to its top. Kesten proved a law of large numbers for the maximal flow in dimension three: under some assumptions, $ϕ_{n^{d-1},h(n)} / n^{d-1}$ converges towards a constant $ν$. We look now at the probability that $ϕ_{n^{d-1},h(n)} / n^{d-1}$ is greater than $ν+ ε$ for some $ε>0$, and we show under some assumptions that this probability decays exponentially fast with the volume of the cylinder. Moreover, we prove a large deviations principle for the sequence $(ϕ_{n^{d-1},h(n)} / n^{d-1}, n\in \mathbb{N})$.
description: 27 pages, 4 figures; small changes of notations
Veronica Biermann, Ornamentum: Studien zum Traktat ››De re aedificatoria‹‹ des Leon Battista Alberti
Creators: name: Wulfram, Hartmut
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Veronica Biermann, Ornamentum: Studien zum Traktat ››De re aedificatoria‹‹ des Leon Battista Alberti, Hildesheim, Zürich, New York 1997, Georg Olms Verlag, Studien zur Kunstgeschichte Bd. 111, XIV und 232 S.
description: Göttinger Forum für Altertumswissenschaft, Bd. 2 (1999): Göttinger Forum für Altertumswissenschaft
Vibrational features in inelastic electron tunneling spectra
Creators: name: Walczak, Kamil
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A theoretical analysis of inelastic electron tunneling spectroscopy (IETS) experiments conducted on molecular junctions are presented, where the second derivative of the current with respect to voltage is usually plotted as a function of applied bias. Within the nonperturbative computational scheme, adequate for arbitrary parameters of the model, we consider the virtual conduction process in the off-resonance region. Here we study the influence of few crucial factors on the IETS spectra: the strength of the vibronic coupling, the phonon energy, and the device working temperature. It was also shown that weak asymmetry in the IETS signal with respect to bias polarity is obtained as a result of strongly asymmetric connection with the electrodes.
description: 9 pages, 9 figures
Generation of Realistic Cloud Access Times for Mobile Application Testing using Transfer Learning
Creators: name: Rege, Manoj R.
name: Handziski, Vlado
name: Wolisz, Adam
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Machine Learning (cs.LG)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: The network Quality of Service (QoS) metrics such as the access time, the bandwidth, and the packet loss play an important role in determining the Quality of Experience (QoE) of mobile applications. Various factors like the Radio Resource Control (RRC) states, the Mobile Network Operator (MNO) specific retransmission configurations, handovers triggered by the user mobility, the network load, etc. can cause high variability in these QoS metrics on 4G/LTE, and WiFi networks, which can be detrimental to the application QoE. Therefore, exposing the mobile application to realistic network QoS metrics is critical for a tester attempting to predict its QoE. A viable approach is testing using synthetic traces. The main challenge in the generation of realistic synthetic traces is the diversity of environments and the lack of wide scope of real traces to calibrate the generators. In this paper, we describe a measurement-driven methodology based on transfer learning with Long Short Term Memory (LSTM) neural nets to solve this problem. The methodology requires a relatively short sample of the targeted environment to adapt the presented basic model to new environments, thus simplifying synthetic traces generation. We present this feature for realistic WiFi and LTE cloud access time models adapted for diverse target environments with a trace size of just 6000 samples measured over a few tens of minutes. We demonstrate that synthetic traces generated from these models are capable of accurately reproducing application QoE metric distributions including their outlier values.
description: Accepted by Elsevier Computer Communications, 24 pages, 14 figures, corrected typos, figures in grayscale
Amorphization induced by pressure: results for zeolites and general implications
Creators: name: Peral, Inmaculada
name: Iniguez, Jorge
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report an {\sl ab initio} study of pressure-induced amorphization (PIA) in zeolites, which are model systems for this phenomenon. We confirm the occurrence of low-density amorphous phases like the one reported by Greaves {\sl et al.} [Science {\bf 308}, 1299 (2005)], which preserves the crystalline topology and might constitute a new type of glass. The role of the zeolite composition regarding PIA is explained. Our results support the correctness of existing models for the basic PIA mechanim, but suggest that energetic, rather than kinetic, factors determine the irreversibility of the transition.
description: 4 pages with 3 figures embedded. More information at http://www.icmab.es/dmmis/leem/jorge
Untangling scaling dimensions of fixed charge operators in Higgs Theories
Creators: name: Antipin, Oleg
name: Bersini, Jahmall
name: Sannino, Francesco
name: Wang, Zhi-Wei
name: Zhang, Chen
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We go beyond a systematic review of the semiclassical approaches for determining the scaling dimensions of fixed-charge operators in $U(1)$ and $O(N)$ models by introducing a general strategy apt at determining the relation between a given charge configuration and the associated operators for more involved symmetry groups such as the $U(N) \times U(M)$. We show how, varying the charge configuration, it is possible to access anomalous dimensions of different operators transforming according to a variety of irreducible representations of the non-abelian symmetry group without the aid of diagrammatical computations. We illustrate our computational strategy by determining the anomalous dimensions of several composite operators to the next-to-leading order in the semiclassical expansion for the $U(N) \times U(M)$ conformal field theory (CFT) in $4-ε$ dimensions. Thanks to the powerful interplay between semiclassical methods and group theory we can, for the first time, extract scaling dimensions for a wide range of operators.
description: 36 pages, 3 figures
Gregor Maurach, Methoden der Latinistik. Ein Lehrbuch zum Selbstunterricht
Creators: name: Glei, Reinhold F.
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Gregor Maurach, Methoden der Latinistik. Ein Lehrbuch zum Selbstunterricht. Wissenschaftliche Buchgesellschaft, Darmstadt 1998. XII + 194 Seiten.
description: Göttinger Forum für Altertumswissenschaft, Bd. 2 (1999): Göttinger Forum für Altertumswissenschaft
Experimental study of atmospheric pressure single-pulse nanosecond discharge in pin-to-pin configuration
Creators: name: Wang, Xingxing
name: Patel, Adam
name: Bane, Sally
name: Shashurin, Alexey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: In this work, we present an experimental study of nanosecond high-voltage discharges in a pin-to-pin electrode configuration at atmospheric conditions operating in single-pulse mode (no memory effects). Various discharge parameters, including voltage, current, gas density, rotational/vibrational/gas temperature, and electron number density, were measured. Several different measurement techniques were used, including microwave Rayleigh scattering, laser Rayleigh scattering, optical emission spectroscopy enhanced with a nanosecond probing pulse, fast photography, and electrical parameter measurements. Spark and corona discharge regimes were studied with discharge pulse duration of 90 ns and electrode gap sizes ranging from 2 to 10 mm. The spark regime was observed for gaps < 6 mm using discharge pulse energies of 0.6-1 mJ per mm of the gap length. Higher electron number densities, total electron number per gap length, discharge currents, and gas temperatures were observed for smaller electrode gaps and larger pulse energies, reaching maximal values of about 7.5x10^15 cm-3, 3.5x10^11 electrons per mm, 22 A, and 4,000 K (at 10 us after the discharge), respectively, for a 2 mm gap and 1 mJ/mm discharge pulse energy. Initial breakdown was followed by a secondary breakdown occurring about 30-70 ns later and was associated with ignition of a cathode spot and transition of the discharge to cathodic arc. A majority of the discharge pulse energy was deposited into the gas before the secondary breakdown (85-89%). The electron number density after the ns discharge pulse decayed with a characteristic time scale of 150 ns governed by dissociative recombination and electron attachment to oxygen mechanisms. For the corona regime, substantially lower pulse energies (~0.1 mJ/mm), peak conduction current (1-2 A), and electron numbers (3-5x10^10 electrons per mm), and gas temperatures (360 K) were observed.
R-matrix approach to integrable systems on time scales
Creators: name: Blaszak, Maciej
name: Silindir, Burcu
name: Szablikowski, Blazej M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A general unifying framework for integrable soliton-like systems on time scales is introduced. The $R$-matrix formalism is applied to the algebra of $δ$-differential operators in terms of which one can construct infinite hierarchy of commuting vector fields. The theory is illustrated by two infinite-field integrable hierarchies on time scales which are difference counterparts of KP and mKP. The difference counterparts of AKNS and Kaup-Broer soliton systems are constructed as related finite-field restrictions.
description: 21 pages
Gocha R. Tsetskhladze, Die Griechen in der Kolchis
Creators: name: Bäbler Nesselrath, Balbina
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Gocha R. Tsetskhladze, Die Griechen in der Kolchis (historisch-archäologischer Abriss), Amsterdam 1998, 217 S., 97 sw Abb.
description: Göttinger Forum für Altertumswissenschaft, Bd. 2 (1999): Göttinger Forum für Altertumswissenschaft
The Cepheid Phase Lag Revisited
Creators: name: Szabo, Robert
name: Buchler, J. Robert
name: Bartee, Justin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We compute the phase lags between the radial velocity curves and the light curves $ΔΦ_1= ϕ^{V_r}_1 - ϕ^{mag}_1$ for classical Cepheid model sequences both in the linear and the nonlinear regimes. The nonlinear phase lags generally fall below the linear ones except for high period models where they lie above, and of course for low pulsation amplitudes where the two merge. The calculated phase lags show good agreement with the available observational data of normal amplitude Galactic Cepheids. The metallicity has but a moderate effect on the phase lag, while the mass-luminosity relation and the parameters of the turbulent convective model (time-dependent mixing length) mainly influence the modal selection and the period, which is then reflected in the period -- $ΔΦ_1$ diagram. We discuss the potential application of this observable as a discriminant for pulsation modes and as a test for ultra-low amplitudes (ULA) pulsation.
description: 11 pages, 8 figures, accepted for publication in ApJ, minor revisions in the text and figures, (black and white version available from 2nd author's website)
MPEC 2024-T68 : 2024 TY
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TY

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Symmetric Space Sigma-model Dynamics: Internal Metric Formalism
Creators: name: Yilmaz, Nejat Tevfik
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: For the symmetric space sigma model in the internal metric formalism we explicitly construct the lagrangian in terms of the axions and the dilatons of the solvable Lie algebra gauge and then we exactly derive the axion-dilaton field equations.
description: 10 pages
Photo-induced superconducting-like response in strongly correlated systems
Creators: name: Dai, Zhehao
name: Lee, Patrick A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We propose a novel mechanism for the photo-induced superconducting-like response recently reported in cuprates and other strongly correlated materials. This mechanism relies on quantum-fluctuating bosons consisting of electron pairs. With periodic drive, the electron pairs and vacancies of pairs form a coherent non-equilibrium condensate, different from conventional superconductors, yet showing superconducting-like response in some regimes even with dissipation. Unlike the case of driven fermionic bands which results in the familiar Floquet bands with hybridization gaps, for driven bosons the "gap" opens up in the momentum direction, resulting in a resonant region in momentum space where the eigenvalues are complex. We give a simple physical argument why this picture leads to a "perfect conductor" which exhibits superconducting-like frequency-dependent conductivity but no Meissner response. While our model is quite general, in the case of cuprates, quantum-fluctuating pair density wave in the pseudogap region may serve as the origin of the quantum-fluctuating electron pairs.
description: 11 + 5 pages, 5 figues
Ασφάλεια πολυμεσικών πληροφοριακών ιατρικών συστημάτων
Creators: name: Τζελέπη, Σοφία Κ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Ασφάλεια
Συστήματα πολυμεσικών βάσεων
Ιατρικές εικόνες
Πολιτική ασφάλειας ελέγχου προσπέλασης
Ασφαλή διαβάθμιση ιατρικών εικόνων
Ελεγχος προσπέλασης με βάση το περιεχόμενο και το γενικό πλαίσιο
Security
Multimedia database systems
Medical images
Access control security policy
Medical image security classification
Content and context-based access control

description: Η διατριβή αυτή επικεντρώνει το ενδιαφέρον της στη μελέτη θεμάτων ασφάλειας ιατρικών πολυμεσικών πληροφοριακών συστημάτων και ειδικότερα στο ζήτημα του ελέγχου προσπέλασης των συστημάτων ιατρικών βάσεων πολυμεσικών δεδομένων. Οι περισσότερες μέχρι τώρα έρευνες έχουν επικεντρωθεί στη μελέτη και ανάπτυξη πολιτικών ασφάλειας χαμηλού επιπέδου. Οι παραπάνω έρευνες όμως είναι απαραίτητο να πλαισιωθούν από ανάλογες προσπάθειες καθορισμού πολιτικών ελέγχου προσπέλασης για την κάλυψη περαιτέρω αναγκών ασφάλειας, όπως είναι ο περιορισμός στην πρόσβαση των πολυμεσικών ιατρικών δεδομένων με βάση κυρίως το σημασιολογικό περιεχόμενό τους. Στα πλαίσια της διατριβής αυτής διαμορφώθηκαν πολιτικές ασφάλειας ελέγχου προσπέλασης τόσο για τα ιατρικά συστήματα βάσεων πολυμεσικών δεδομένων όσο και ειδικότερα για τα συστήματα βάσεων ιατρικών εικόνων.
description: The application of information technology to health care has generated growing concern about the security of medical information. Furthermore, data and communication security requirements in the field of multimedia are higher. In this thesis we describe firstly the most important security requirements that must be fulfilled by multimedia medical data, and the security measures used to satisfy these requirements. These security measures are based mainly on modern cryptographic and watermarking mechanisms as well as on security infrastructures. The objective of our work is to complete this picture, exploiting the capabilities of multimedia medical data to define and implement on authorization model for regulating access to the data based mainly on their semantic content and on context.
Η εσωτερική πολιτική του Ανδρόνικου Β' Παλαιολόγου (1283-1328): διοίκηση - οικονομία
Creators: name: Κοντογιαννοπούλου, Αναστασία
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Εσωτερική πολιτική
Διοίκηση
Οικονομία

description: Σκοπός της παρούσας εργασίας είναι η μελέτη της εσωτερικής οργάνωσης της βυζαντινής αυτοκρατορίας στους χρόνους της βασιλείας του Ανδρόνικου Β' Παλαιολόγου και της εσωτερικής πολιτικής του αυτοκράτορα. Η έρευνα επικεντρώνεται στους δύο σημαντικότερους τομείς του κρατικού μηχανισμού, τη διοίκηση και την οικονομία. Στα κεφάλαια της εργασίας γίνεται προσπάθεια να απαντηθούν καίρια ερωτήματα, όπως κατά πόσο διατηρήθηκαν στα χρόνια αυτά, δηλαδή μετά τις πολιτικές ανακατατάξεις του 13ου αιώνα, οι δομές που ίσχυαν παλαιότερα, αν ήταν εφικτό υπό τις υπάρχουσες συνθήκες να υπάρχει οργανωμένη διοίκηση, αν επιβίωσαν και πως παλαιότεροι θεσμοί. Η μορφή του διοικητικού και οικνομικού μηχανισμού δεν εμφανίζει μεγάλες διαφορές από εκείνη που είχε διαμορφωθεί στους χρόνους της αυτοκρατορίας της Νίκαιας (1204-1261). Παρά το γεγονός ότι κάποιες αποφάσεις εσωτερικής πολιτικής έφεραν την αυτοκρατορία σε δυσάρεστη θέση, όπως για παράδειγμα η διάλυση του στόλου από τον αυτοκράτορα, ο Ανδρόνικος Β' Παλαιολόγος ενδιαφέρθηκε για την καλή οργανωσή της κεντρικής και επαρχιακής διοίκησης και κατέβαλε σημαντικές προσπάθειες για την βελτίωση των δημοσίων οικονομικών. Η εμφύλια διαμάχη στα τελευταία χρόνια της βασιλείας του σταμάτησε τις προσπάθειες αυτές, ενώ ο μεγάλος εμφύλιος των μέσων του 14ου αιώνα οδήγησε το κράτος σε εσωτερική αποδιοργάνωση.
description: The object of this thesis is astudy of the internal organization of byzantine empire during the reign of Andronicus II Palaeologus and his domestic policy. The two most important parts of the state machinery, administration and economy, consist the focal point of this research. In the chapters of this study takes place an effort to be answered some crucial questions, such as whether old structures were conserved at that time, that is after the political realignments of the 13th century, or if a well-organized administration existed under the circumstances or even if old institutions survived and how did they. The form of administrative and economic machinery does not shows great differences from the one, which formed during the empire of Nicaea (1204-1261). Despite the fact that some imperial decisions concerned the domestic policy brought the empire into a disagreeable position, for exable the dissolution of the imperial fleet by the emperor, Andronicus II was interested in the good organization of the central and provincial administration and he took great pains for the improvement of the public finances. The civil war was during the last years of his reign interrupt these efforts, while the great civil war in the middle of the 14th century led the state up to the internal disruption.
Implications of a Running Spectral Index for Slow Roll Inflation
Creators: name: Easther, Richard
name: Peiris, Hiranya
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze the weak (2 sigma) evidence for a running spectral index seen in the three-year WMAP dataset and its implications for single field, slow roll inflation. We assume that the running is comparable to the central value found from the WMAP data analysis, and use the Hubble Slow Roll formalism to follow the evolution of the slow roll parameters. For all parameter choices consistent with a large, negative running, single field, slow roll inflation lasts less than 30 efolds after CMB scales leave the horizon. Thus, a definitive observation of a large negative running would imply that any inflationary phase requires multiple fields or the breakdown of slow roll. Alternatively, if single field, slow roll inflation is sources the primordial fluctuations, we can expect the observed running to move much closer to zero as the CMB is measured more accurately at small angular scales.
description: 4 pages; v2 Refs added, some clarifications in discussion, minor typos fixed
'Grundriss der Geschichte der Philosophie'. Begründet von F. Ueberweg. Völlig neubearbeitete Ausgabe – 'Die Philosophie der Antike'. Band 2/1: 'Sophistik; Sokrates – Sokratik; Mathematik; Medizin' v. Klaus Döring, Hellmut Flashar, Georg B. Kerferd, Carolin Osing-Grote, Hans-Joachim Waschkies. Hrsg. v. Hellmut Flashar
Creators: name: Dorandi, Tiziano
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: 'Grundriss der Geschichte der Philosophie'. Begründet von F. Ueberweg. Völlig neubearbeitete Ausgabe – 'Die Philosophie der Antike'. Band 2/1: 'Sophistik; Sokrates – Sokratik; Mathematik; Medizin' v. Klaus D öring, Hellmut Flashar, Georg B. Kerferd, Carolin Osing-Grote, Hans-Joachim Waschkies. Hrsg. v. Hellmut Flashar, Basel, Schwabe & Co. 1998, XIV–540 p.
description: Göttinger Forum für Altertumswissenschaft, Bd. 2 (1999): Göttinger Forum für Altertumswissenschaft
Myrina – Tarent – Athen: Neue Publikationen zu Terrakotta-Figuren aus antiken Gräbern: Ute Mrogenda, Die Terrakotten von Myrina / Daniel Graepler, Tonfiguren im Grab / Barbara Vierneisel-Schlörb, Die figürlichen Terrakotten I
Creators: name: Rumscheid, Frank
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Rezension zu: Ute Mrogenda, Die Terrakotten von Myrina. Eine Untersuchung ihrer möglichen Bedeutung und Funktion im Grabzusammenhang (= Europäische Hochschulschriften Reihe 38, Archäologie Bd. 63), Verlag Peter Lang, Frankfurt am Main 1996, 200 Seiten, 8 Tafeln Strichzeichnungen, 65,- DM. Rezension zu: Daniel Graepler, Tonfiguren im Grab. Fundkontexte hellenistischer Terrakotten aus der Nekropole von Tarent, Verlag Biering & Brinkmann, München 1997, 320 Seiten mit 293 teilweise farbigen photographischen Abbildungen, zahlreichen Strichzeichnungen und mehreren Graphiken, 189,-DM. Rezension zu: Barbara Vierneisel-Schlörb, Die figürlichen Terrakotten I. Spättmykenisch bis späthellenistisch, Kerameikos XV, Verlag Hirmer, München 1997, XIV und 204 Seiten, 112 Tafeln photographische Abbildungen, 180,- DM.
description: Göttinger Forum für Altertumswissenschaft, Bd. 2 (1999): Göttinger Forum für Altertumswissenschaft
Πειραματική και θεωρητική μελέτη των αλληλεπιδράσεων μεταξύ αερίων και πολυμερών σε ευρεία περιοχή θερμοκρασιών και πιέσεων
Creators: name: Μπουδούρης, Δημήτριος
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Πολυμερές
Αέριο
Θεωρία δικτυακού ρευστού
Πίεση
Polymer
Gas
Lattice fluid theory
Pressure

description: Ο κύριος σκοπός της διατριβής είναι η μελέτη των αλληλεπιδράσεων μεταξύ αερίων και πολυμερών σε ευρεία περιοχή θερμοκρασιών και πιέσεων και ειδικότερα η παροχή στην επιστημονική και βιομηχανική κοινότητα αξιόπιστων πειραματικών δεδομένων και η ανάπτυξη θεωρητικών μοντέλων για την πρόβλεψη της προσρόφησης αερίων σε πολυμερή. Για τη συλλογή πειραματικών δεδομένων προσρόφησης αναπτύχθηκε μια πειραματική διάταξη που βασίστηκε στη μέθοδο μικροζυγού κρυστάλλου χαλαζία. Η πειραματική μελέτη κινήθηκε σε 3 κατευθύνσεις, την προσρόφηση διογκωτικών αερίων σε πολυμερή, μιγμάτων αερίων σε ημικρυσταλλικά πολυμερή και αερίων σε συμπολυμερή. Στη συνέχεια αναπτύχθηκαν θεωρητικά μοντέλα για την πρόβλεψη της προσρόφησης αερίων σε πολυμερή τόσο σε ισορροπία όσο και σε θερμοκρασίες κάτω από την θερμοκρασία υαλώδους μετάβασης. Για τη χρήση αυτών των μοντέλων που βασίζονται στη θεωρία ψευδοχημικού δικτυακού ρευστού απαιτούνται οι σταθερές κλιμάκωσης των πολυμερών. Αυτές προσδιορίζονται είτε πειραματικά από τη μέτρηση ογκομετρικών ιδιοτήτων πολυμερών, είτε με μία μέθοδο συνεισφοράς ομάδων, είτε με μοριακή προσομοίωση. Οι προβλέψεις ήταν σε ικανοποιητική συμφωνία με τις πειραματικές μετρήσεις.
description: The main aim of this thesis is the study of interactions between gases and polymers at extended range of temperature and pressure and especially the measurement of reliable experimental data for the scientific and industrial community and the development of theoretical models for the prediction of sorption of gases in polymers. An experimental apparatus that is based in the quartz crystal microbalance method was developed for the measurement of sorption data. The experimental study was focused on three areas, sorption of blowing agents in polymers, sorption of mixtures of gases in semicrystalline polymers and sorption of gases in copolymers. Afterwards, theoretical models were developed for the prediction of sorption of gases in polymers. But for the use of these models, the scaling constants of polymers were essential. These scaling constants can be determined by three ways: experimentally, by use of a group contribution method and by molecular simulation. Agreement between predictions of the models and experimental values was satisfactory.
Towards a Quantum Fluid Theory of Correlated Many-Fermion Systems from First Principles
Creators: name: Moldabekov, Zh. A.
name: Dornheim, T.
name: Gregori, G.
name: Graziani, F.
name: Bonitz, M.
name: Cangi, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Correlated many-fermion systems emerge in a broad range of phenomena in warm dense matter, plasmonics, and ultracold atoms. Quantum hydrodynamics (QHD) complements common first-principles methods for many-fermion systems and enables simulations at larger length and longer time scales. While the quantum Bohm potential is central to QHD, we illustrate its failure for strong perturbations. We extend QHD to this regime by utilizing the many-fermion quantum Bohm potential. This opens up the path to more accurate simulations in strongly perturbed warm dense matter, inhomogeneous quantum plasmas, and on nano-structure surfaces at scales unattainable with first-principles algorithms. The many-fermion quantum Bohm potential might also have important astrophysical applications in developing conformal-invariant cosmologies.
Apollodoros manikos – ein textkritisches Problem in Platons 'Symposion' 173d8 und dessen Konsequenzen
Creators: name: Schirren, Thomas
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 2 (1999): Göttinger Forum für Altertumswissenschaft
L3CubeMahaSent: A Marathi Tweet-based Sentiment Analysis Dataset
Creators: name: Kulkarni, Atharva
name: Mandhane, Meet
name: Likhitkar, Manali
name: Kshirsagar, Gayatri
name: Joshi, Raviraj
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Sentiment analysis is one of the most fundamental tasks in Natural Language Processing. Popular languages like English, Arabic, Russian, Mandarin, and also Indian languages such as Hindi, Bengali, Tamil have seen a significant amount of work in this area. However, the Marathi language which is the third most popular language in India still lags behind due to the absence of proper datasets. In this paper, we present the first major publicly available Marathi Sentiment Analysis Dataset - L3CubeMahaSent. It is curated using tweets extracted from various Maharashtrian personalities' Twitter accounts. Our dataset consists of ~16,000 distinct tweets classified in three broad classes viz. positive, negative, and neutral. We also present the guidelines using which we annotated the tweets. Finally, we present the statistics of our dataset and baseline classification results using CNN, LSTM, ULMFiT, and BERT-based deep learning models.
description: Accepted at WASSA@EACL 2021
Polyfluorene as a model system for space-charge-limited conduction
Creators: name: Arif, M.
name: Yun, M.
name: Gangopadhyay, S.
name: Ghosh, K.
name: Fadiga, L.
name: Galbrecht, F.
name: Scherf, U.
name: Guha, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ethyl-hexyl substituted polyfluorene (PF) with its high level of molecular disorder can be described very well by one-carrier space-charge-limited conduction for a discrete set of trap levels with energy $\sim$ 0.5 eV above the valence band edge. Sweeping the bias above the trap-filling limit in the as-is polymer generates a new set of exponential traps, which is clearly seen in the density of states calculations. The trapped charges in the new set of traps have very long lifetimes and can be detrapped by photoexcitation. Thermal cycling the PF film to a crystalline phase prevents creation of additional traps at higher voltages.
description: 13 pages, 4 figures. Physical Review B (accepted, 2007)
Klientelen und Wahlkampf im Spiegel des 'commentariolum petitionis'
Creators: name: Laser, Günter
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 2 (1999): Göttinger Forum für Altertumswissenschaft
Status Report on ILDG activities
Creators: name: Jansen, Karl
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: A status report about the International Lattice Data Grid (ILDG) is given. Different countries participating in the ILDG have created regional lattice data grid solutions that are implemented, working and used. The remaining task and the focus of present activities is the development of the interoperability of these regional grids. A first, successful step in this direction is a metadata catalogue service which is already working interoperable.
description: Plenary contribution to the XXIVth International Symposium on Lattice Field Theory, July 23-28, 2006, Tucson, Arizona, USA (changed preprint number)
Fluorine solubility and superconducting properties of Sm(O,F)BiS$_2$ single crystals
Creators: name: Kinami, Koki
name: Hanada, Yuji
name: Nagao, Masanori
name: Miura, Akira
name: Hirai, Shigeto
name: Maruyama, Yuki
name: Watauchi, Satoshi
name: Tanaka, Isao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Sm(O,F)BiS2 superconducting single crystals with various nominal F contents have been grown using KI-KCl flux. The solid solution limit of F at the O-site in Sm(O,F)BiS2 single crystals was approximately less than 20 at%. F concentrations of Sm(O,F)BiS2 single crystals were hardly controlled by nominal F contents. It suggests the existence of intrinsic stable phase. Superconductivity was shown at around 5 K. Superconducting transition temperature with zero resistivity were increased with increasing nominal F contents within less than 70 at% in O-site, despite similar F concentration and c-axis lattice constants.
Zur Datierung des Basler Figurentraktats (cod. lat. F III 15 d)
Creators: name: Schindel, Ulrich
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 2 (1999): Göttinger Forum für Altertumswissenschaft
Rapid Classification of Glaucomatous Fundus Images
Creators: name: Singh, Hardit
name: Saini, Simarjeet
name: Lakshminarayanan, Vasudevan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences
subject: I.4.9; J.4
subject: 68

description: We propose a new method for training convolutional neural networks which integrates reinforcement learning along with supervised learning and use ti for transfer learning for classification of glaucoma from colored fundus images. The training method uses hill climbing techniques via two different climber types, viz "random movment" and "random detection" integrated with supervised learning model though stochastic gradient descent with momentum (SGDM) model. The model was trained and tested using the Drishti GS and RIM-ONE-r2 datasets having glaucomatous and normal fundus images. The performance metrics for prediction was tested by transfer learning on five CNN architectures, namely GoogLenet, DesnseNet-201, NASNet, VGG-19 and Inception-resnet-v2. A fivefold classification was used for evaluating the perfroamnace and high sensitivities while high maintaining high accuracies were achieved. Of the models tested, the denseNet-201 architecture performed the best in terms of sensitivity and area under the curve (AUC). This method of training allows transfer learning on small datasets and can be applied for tele-ophthalmology applications including training with local datasets.
description: Submitted for publication in JOSA A: Optics and Image Science, currently under revision
Der Marmortorso im Lenbachmuseum Schrobenhausen und der Ephebentypus "Villa Albani – Kopenhagen"
Creators: name: Herzog, Horst
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 2 (1999): Göttinger Forum für Altertumswissenschaft
Generalized Quantum Telecloning
Creators: name: Gordon, Goren
name: Rigolin, Gustavo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a generalized telecloning (GTC) protocol where the quantum channel is non-optimally entangled and we study how the fidelity of the telecloned states depends on the entanglement of the channel. We show that one can increase the fidelity of the telecloned states, achieving the optimal value in some situations, by properly choosing the measurement basis at Alice's, albeit turning the protocol to a probabilistic one. We also show how one can convert the GTC protocol to the teleportation protocol via proper unitary operations.
description: 6 pages, 1 figure, RevTex4; v2: published version, 8 pages, 4 figures, RevTex4, to appear at Eur. Phys. J. D
HST and TESS Point to a Highly Spotted Photosphere for HD189733A
Creators: name: Narrett, Isaac
name: Rackham, Benjamin
name: de Wit, Julien
Publisher: name: Zenodo
Year: 2024
Subjects: Exoplanets
Data Analysis Techniques
TESS
Stellar Heterogeneities

description: Transmission spectra can be affected by stellar photospheric heterogeneities that alter transit depths. The HD189733 system provides a clear example of this challenge, with features variously interpreted as signatures of scattering by haze in the planetary atmosphere or unocculted starspots. Here, we use three Hubble datasets to directly infer the spot covering fraction of HD189733A and explore the evidence for photospheric heterogeneity in the out-of-transit spectra. We model the stellar spectrum using 1–3 spectral components, finding that a two-component model (photosphere and spot) is preferred for all datasets. We find photospheric and spot temperatures of ~5295 K and ~3222 K, respectively, which are consistent across datasets. The spot covering fraction is large and varies between ~38% and ~47%. Combined with time-domain insights from TESS data revealing HD189733A's 1.4% peak-to-peak variability, our findings imply that the majority of the spots must be distributed axisymmetrically, e.g., in a densely filled latitudinal band or at the poles. This work underscores the importance of considering axisymmetric spot distributions in analyses of transmission spectra and the unique role that TESS plays in this effort.
X-ray absorption in distant type II QSOs
Creators: name: Krumpe, M.
name: Lamer, G.
name: Corral, A.
name: Schwope, A. D.
name: Carrera, F. J.
name: Barcons, X.
name: Page, M.
name: Mateos, S.
name: Tedds, J. A.
name: Watson, M. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of the X-ray spectral analysis of an XMM-Newton-selected type II QSO sample with z>0.5 and 0.5-10 keV flux of 0.3-33 x 10^{-14} erg/s/cm^2. The distribution of absorbing column densities in type II QSOs is investigated and the dependence of absorption on X-ray luminosity and redshift is studied. We inspected 51 spectroscopically classified type II QSO candidates from the XMM-Newton Marano field survey, the XMM-Newton-2dF wide angle survey (XWAS), and the AXIS survey to set-up a well-defined sample with secure optical type II identifications. Fourteen type II QSOs were classified and an X-ray spectral analysis performed. Since most of our sources have only ~40 X-ray counts (PN-detector), we carefully studied the fit results of the simulated X-ray spectra as a function of fit statistic and binning method. We determined that fitting the spectra with the Cash-statistic and a binning of minimum one count per bin recovers the input values of the simulated X-ray spectra best. Above 100 PN counts, the free fits of the spectrum's slope and absorbing hydrogen column density are reliable. We find only moderate absorption (N_H=(2-10) x 10^22 cm^-2) and no obvious trends with redshift and intrinsic X-ray luminosity. In a few cases a Compton-thick absorber cannot be excluded. Two type II objects with no X-ray absorption were discovered. We find no evidence for an intrinsic separation between type II AGN and high X-ray luminosity type II QSO in terms of absorption. The stacked X-ray spectrum of our 14 type II QSOs shows no iron K-alpha line. In contrast, the stack of the 8 type II AGN reveals a very prominent iron K-alpha line at an energy of ~ 6.6 keV and an EW ~ 2 keV.
description: Accepted for publication in A&A (March 03, 2008), 12 pages, 9 figures, online material
Τεχνικές προστασίας εικόνων και εικονοσειρών και εφαρμογές υδατογραφίας
Creators: name: Σιμιτόπουλος, Δημήτριος
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Κρυπτογραφία
Γενικευμένοι μετασχηματισμοί Radon
Γενικευμένος ανιχνευτής συσχέτισης
Γεωμετρικές επιθέσεις
Cryptography
Generalized Radon transformations
Generalized correlator detector
Copyright protection
Geometric attacks

description: Στην παρούσα διατριβή μελετώνται τεχνικές προστασίας εικόνων και εικονοσειρών και εφαρμογές υδατογραφίας. Συγκεκριμένα, αρχικά προτείνεται μια νέα μέθοδος υδατογραφίας που είναι κατάλληλη για την προστασία των πνευματικών δικαιωμάτων σε ψηφιακές εικόνες που έχουν υποστεί γεωμετρικές παραμορφώσεις. Η μέθοδος βασίζεται στη χρήση γενικευμένων μετασχηματισμών Radon και είναι ιδαίτερη ανθεκτική στην περίπτωση επιθέσεων περιστροφής και κλιμάκωσης. Επιπρόσθετα, παρουσιάζεται ένα γρήγορο σύστημα υδατογραφίας ακολουθιών εικόνων που λειτουργεί στο πεδίο των συμπιεσμένων δεδομένων και είναι κατάλληλο για πολυπλεγμένα βίντεο MPEG-1/2 (περιέχουν ήχο και εικόνα). Η ανίχνευση του υδατογραφήματος γίνεται χρησιμοποιώντας ένα γενικευμένο ανιχνευτή συσχέτισηςπου εκτελεί μία μη γραμμική προεπεξεργασία των δεδομένων πριν από την συσχέτιση και παρουσιάζει καλύτερη απόδοση σε σχέση με τον κλασικό ανιχνευτή συσχέτισης. Προτείνεται επίσης ένα σύστημα συνδυασμένης κρυπτογραφίας και υδατογραφίας για την ασφαλή διανομή βίντεο MPEG σε CD και DVD. Τέλος, μελετάται η ένθεση πληροφοριών σε εικόνες που κωδικοποιούνται σύμφωνα με το πρότυπο κωδικοποίησης εικόνων JPEG2000.
description: In the present thesis, protection techniques and watermarking applications for image and video are studied. In particular, initially a new watermarking method is presented, which is suitable for copyright protection in digital images that have undergone geometric attacks. The proposed method is based on generalized Radon transformations and is esoecially robust to scaling and rotation attacks. Additionally, a fast video watermarking system that operates in the compressed domain and is suitable for multiplexed MPEG-1/2 video is described. The proposed system detects the watermark using a generalized correlator detector that performs a non-linear preprocessing of the data before detection and outperforms the classic correlator in terms of detection performance. A complete video security system is also proposed, which combines cryptography watermarking for the secure delivery of MPEG video in CD and DVD. Finally, information embedding in images that are coded using the JPEG2000 coding standard is studied
Epitome de Caesaribus, Landolfus Sagax und 300 000 Alamannen
Creators: name: Bleckmann, Bruno
Publisher: name: Göttinger Forum für Altertumswissenschaft
Year: 2021

description: Göttinger Forum für Altertumswissenschaft, Bd. 2 (1999): Göttinger Forum für Altertumswissenschaft
Ο λόγος περί εικαστικών τεχνών στην Ελλάδα τον 19ο αιώνα
Creators: name: Ιωαννίδης, Κωνσταντίνος Ε.
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Τέχνη-Ερμηνεία
UT Pictura poesis
Art-Interpretation

description: Στόχος της εργασίας αυτής είναι η εξέταση της διαδικασίας συγκρότησης ενός συστηματικού τρόπου θέασης και ερμηνείας των εικαστικών έργων μετά τα μέσα του 19ου αιώνα. Εξετάζεται ένα σώμα κειμένων από έντυπα της περιόδου (εφημερίδες, περιοδικά, φυλλάδια, βιβλία) που εκδόθηκαν στο ελληνικό κράτος αλλά και σε κοινότητες της διασποράς. Η εξέταση του υλικού γίνεται σε τρεις άξονες: α) Αναδεικνύεται ο ρόλος προσωπικοτήτων της εποχής β) Αναλύονται τρόποι γραφής περί εικαστικών τεχνών γ) Με αφετηρία τον 19ο αιώνα εκτίθενται ζητήματα ιστοριογραφικής θεωρίας και πράξης με σύγχρονες προβολές. Καταλήγω στο συμπέρασμα ότι ενώ ο τρόπος ερμηνείας και γραφής περί εικαστικών είναι περισσότερο οπτικά προσανατολισμένος κατά το α' μισό του αιώνα, στο β' μισό και ειδικά από το 1860 και μετά κυριαρχεί ένας αφηγηματικός λόγος, μια ιστορικιστική προσέγγιση των έργων τέχνης.
description: The purpose of my thesis is to examine the process by which a systematic mode of seeing and interpreting works of visual art was developed in Greece from the mid-19th century onwards. It is a process which might be viewed as the main symptom of the gradual establishment of art history as an autonomous discipline towards the latter part of the period in question. The dissertation will involve scrutiny of publications from this period (newspapers, journals, leaflets, books), printed both here in Greece and beyond the Greek borders –in the various communities of the Greek diaspora. The examination of the material will proceed along three axes:a) A focus on personalities; attempting to identify scholars of the period who played an important part in the evolution of the field under study.b) Rhetorical analysis of different ways of writing about the visual arts: encyclopaedic, ekphrastic, biographical, etc.c) Starting, again, in the 19th century, I attempt an approach to aspects of theory and practice in the writing of history with contemporary projections: image, history and interpretation, fiction and history, etc.The conclusion I reach is that after the middle of the 19th century, and more specifically towards the end of the 1860s, the relevant literature undergoes an important change. Originally a field characterised largely by a multiplicity of voices expressing themselves in a series of approaches of more visual orientation the attempt to render the image in words, as in ancient ekphrasis the discourse, now articulated within a community of experts, becomes almost exclusively focused on the biographical and historical. It is dominated by unifying historical narratives; the practices of historicism are now extended to the field of the visual arts.
Neutrino Coannihilation on Dark-Matter Relics?
Creators: name: Barenboim, Gabriela
name: Requejo, Olga Mena
name: Quigg, Chris
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: High-energy neutrinos may resonate with relic background neutralinos to form short-lived sneutrinos. In some circumstances, the decay chain that leads back to the lightest supersymmetric particle would yield few-GeV gamma rays or charged-particle signals. Although resonant coannihilation would occur at an appreciable rate in our galaxy, the signal in any foreseeable detector is unobservably small.
description: 5 pages, 3 figures, uses RevTeX 4