cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Optimization of Design Parameters for SPPC Longitudinal Dynamics
Creators: name: Zhang, L. H.
name: Tang, J. Y.
name: Hong, Y.
name: Chen, Y. K.
name: Wang, L. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: As the second stage of the CEPC-SPPC project, SPPC (Super Proton-Proton Collider) aims at exploring new physics beyond the Standard Model. The key design goal for the SPPC accelerator complex is to reach 75 TeV in center of mass energy with a circumference of 100 km for the collider and an injector chain of four accelerators in cascade to support the collider. As an important part of the SPPC conceptual study, the longitudinal beam dynamics was studied systematically, which includes the dynamics in the collider and its complex injector chain. First, the bunch filling scheme of the SPPC complex was designed on the basis of various constraints such as the technical challenges of the kicker magnets, limited extraction energy per injection and so on. Next, the study on the longitudinal dynamics in the collider focused on the RF scheme to meet the requirements for luminosity and mitigate relevant instabilities. A higher harmonic RF system (800 MHz) together with the basic RF system (400 MHz) to form a dual-harmonic RF system was employed to mitigate collective instabilities and increase the luminosity by producing shorter bunches. In addition, the longitudinal matchings between the bunches in the different accelerator stages were studied, with special attention to the space charge effects and the beam loading effect in the two lower energy rings (p-RCS and MSS), which result in an optimization of the RF schemes. A set of self-consistent beam and RF parameters for the SPPC complex was obtained. The collider and the three proton synchrotrons of the injector chain have unprecedented features, thus this study demonstrates how a future proton-proton collider complex looks like.
description: 24 pages, 13 figures
Intensity correlations and mesoscopic fluctuations of diffusing photons in cold atoms
Creators: name: Assaf, O.
name: Akkermans, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the angular correlation function of speckle patterns that result from multiple scattering of photons by cold atomic clouds. We show that this correlation function becomes larger than the value given by Rayleigh law for classical scatterers. These large intensity fluctuations constitute a new mesoscopic interference effect specific to atom-photon interactions, that could not be observed in other systems such as weakly disordered metals. We provide a complete description of this behavior and expressions that allow for a quantitative comparison with experiments.
description: 4 pages, 2 figures
Spin Dephasing in Drift-Dominated Semiconductor Spintronics Devices
Creators: name: Huang, Biqin
name: Appelbaum, Ian
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: A spin transport model is employed to study the effects of spin dephasing induced by diffusion-driven transit-time uncertainty through semiconductor spintronic devices where drift is the dominant transport mechanism. It is found that in the ohmic regime, dephasing is independent of transit length, and determined primarily by voltage drop across the spin transport region. The effects of voltage and temperature predicted by the model are compared to experimental results from a 350-micron-thick silicon spin-transport device using derived mathematical expressions of spin dephasing.
On Efficient Constructions of Checkpoints
Creators: name: Chen, Yu
name: Liu, Zhenming
name: Ren, Bin
name: Jin, Xin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Efficient construction of checkpoints/snapshots is a critical tool for training and diagnosing deep learning models. In this paper, we propose a lossy compression scheme for checkpoint constructions (called LC-Checkpoint). LC-Checkpoint simultaneously maximizes the compression rate and optimizes the recovery speed, under the assumption that SGD is used to train the model. LC-Checkpointuses quantization and priority promotion to store the most crucial information for SGD to recover, and then uses a Huffman coding to leverage the non-uniform distribution of the gradient scales. Our extensive experiments show that LC-Checkpoint achieves a compression rate up to $28\times$ and recovery speedup up to $5.77\times$ over a state-of-the-art algorithm (SCAR).
Υπερβάλλων ενθουσιασμός, υπερ-αισιοδοξία και οι αποδόσεις των τιμών των μετοχών του Χ.Α.Α.
Creators: name: Κλεάνης, Γεώργιος Πέτρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Συμπεριφορική χρηματοοικονομική
Ποδόσφαιρο
Ελληνική αγορά
Οικονομία
Συμπεριφορά
Ρίσκο
Behavioural finance
Football
Greek market
Economy
Behaviour
Risk

description: Περιγράφεται η επίδραση των αγώνων του Ολυμπιακού και του ΠΑΟ στην Ευρώπη στη διάθεση των οπαδών τους και αν η διάθεση αυτή επηρεάζει τις κινήσεις τους στο Χρηματιστήριο Αξιών Αθηνών. Η έρευνα γίνεται για τη χρονική περίοδο 1990-2006
description: This study describes the impact of behavioural finance in Greek market
Ειδικά προβλήματα παραγραφής: διάκριση ειδικής παραγραφής από αμνηστία, ελληνική πρακτική, νομοθεσία, νομολογία
Creators: name: Νταγκονίκου, Μαρία Παύλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Παραγραφή
Ειδική παραγραφή
Αμνηστία
Negative prescription
Specific negative prescription
Amnesty

description: Αντικείμενο της εν λόγω διπλωματικής εργασίας είναι ο θεσμός της ειδικής παραγραφής. Ειδικότερα αναφέρεται στην έννοια του θεσμού αυτού, διακρίνοντάς τον από εκείνους της γενικής παραγραφής και της αμνηστίας. Περαιτέρω, πραγματεύεται την εμφάνισή του στην ελληνική έννομη τάξη, τις νομοθετικές πρωτοβουλίες αι τη νομολογιακή αντιμετώπιση του θέματος, θέτοντας παράλληλα ζήτημα συνταγματικότητας του θεσμού και ορίων της νομοθετικής εξουσίας
description: The purpose of this diplomatic essay is to familiarize readers with the institution of specific negative prescription. In particular, it refers to the meaning of this institution, distinguishing it from negative prescription and amnesty. Furthermore, it deals with its appeareance in the greek legal state of affaires, the legislative initiative and the way greek courts have dealt with the above mentioned issue, at the same time raising a question of compatibility with the greek constitution and the limits of the legislative power
Experimental Studies of Low-field Landau Quantization in Two-dimensional Electron Systems in GaAs/AlGaAs Heterostructures
Creators: name: Chen, Jing-Han
name: Hang, D. R.
name: Huang, C. F.
name: Huang, Tsai-Yu
name: Lin, Jyun-Ying
name: Lo, S. H.
name: Hsiao, J. C.
name: Lin, Ming-Gu
name: Simmons, M. Y.
name: Ritchie, D. A.
name: Liang, C. -T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: By applying a magnetic field perpendicular to GaAs/AlGaAs two-dimensional electron systems, we study the low-field Landau quantization when the thermal damping is reduced with decreasing the temperature. Magneto-oscillations following Shubnikov-de Haas (SdH) formula are observed even when their amplitudes are so large that the deviation to such a formula is expected. Our experimental results show the importance of the positive magneto-resistance to the extension of SdH formula under the damping induced by the disorder.
description: 9 pages, 3 figures
Supp 1: Multiple episodes of Late Neoproterozoic rifting in the Tarim Craton during its separation from the Supercontinent Rodinia
Creators: name: Wang, Caiyun
name: Wu, Hongxiang
name: Dilek, Yildirim
name: Zhang, Fengqi
name: Chen, Hanlin
name: Li, Feng
name: Qiu, Duwei
name: Shi, Xuhua
name: Lin, Xiubin
name: Cheng, Xiaogan
Publisher: name: Geological Society of London
Year: 2024
Subjects: classificationCode: 3705
subject: Geology
subject: FOS: Earth and related environmental sciences

description: Supplementary Material 1. Analytical methodology.
Chemical Reaction and Variable Suction Velocity On Unsteady MHD Jeffery Flow past a Vertical Porous Plate with Soret-Dufour Effects
Creators: name: A.K.Shukla, Aneesh Jayswal, Mohammad Suleman Quraishi
Publisher: name: Zenodo
Year: 2024

description: This research aims to investigate the combined effects of Soret-Dufour, radiation, first order chemicalreaction, and magnetic hydrodynamics (MHD) Jeffery flow across a vertical porous plate submerged in aporous medium at varying suction velocity. The Mathematical model of the problem is governed by set of nonlinear partial differential equations. The Crank-Nicolson implicit finite difference approach has been used tonumerically solve the nonlinear partial differential equation of flow problem in this model. Graphicalrepresentations of the features of velocity, temperature, and concentration are used, while tables are used toillustrate the characteristics of skin friction, the Nusselt number, and the Sherwood number.
Ηλεκτρονική τραπεζική: ηλεκτρονικές πληρωμές-ηλεκτρονικό χρήμα (τεχνολογία και νομικό πλαίσιο στην Ελλάδα)
Creators: name: Θεοχαρόπουλος, Αντώνιος Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Ηλεκτρονικό χρήμα
Ηλεκτρονικές πληρωμές
Ιδρυμα ηλεκτρονικού χρήματος
Τραπεζικό δίκαιο
Δεδομένα προσωπικού χαρακτήρα
Προστασία καταναλωτή
Electronic money
E-banking
E-purse
E-wallet

description: Περιγραφή τεχνολογικών λύσεων συστημάτων ηλεκτρονικών πληρωμών και ανάλυση μέσων αποθήκευσης και διαχείρισης ηλεκτρονικού χρήματος (ηλεκτρονικά πορτοφόλια, έξυπνες κάρτες). Στο δεύτερο μέρος αναφέρονται οι διατάξεις του ελληνικού δικαίου σχετικά με ιδρύματα ηλεκτρονικού χρήματος, προστασία προσωπικών δεδομένων και προστασία καταναλωτή κατά τις συναλλαγές με ηλεκτρονικό χρήμα
description: Technological means of electronic money transactions and interpretation of greek laws concerning e-money institutions, protection of personal data and protection of the consumer during electronic transactions
Thermodynamic relations at the coupling boundary in adaptive resolution simulations for open systems
Creators: name: Gholami, Abbas
name: Höfling, Felix
name: Klein, Rupert
name: Site, Luigi Delle
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The adaptive resolution simulation (AdResS) technique couples regions with different molecular resolutions and allows the exchange of molecules between different regions in an adaptive fashion. The latest development of the technique allows to abruptly couple the atomistically resolved region with a region of non-interacting point-like particles. The abrupt set-up was derived having in mind the idea of the atomistically resolved region as an open system embedded in a large reservoir at a given macroscopic state. In this work, starting from the idea of open system, we derive thermodynamic relations for AdResS which justify conceptually and numerically the claim of AdResS as a technique for simulating open systems. In particular, we derive the relation between the chemical potential of the AdResS set-up and that of its reference fully atomistic simulation. The implication of this result is that the grand potential of AdResS can be explicitly written and thus, from a statistical mechanics point of view, the atomistically resolved region of AdResS can be identified with a well defined open system.
Particle size and cooling field dependence of exchange bias in core/shell magnetic nanoparticles
Creators: name: Iglesias, Oscar
name: Batlle, Xavier
name: Labarta, Amilcar
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present a numerical simulation study of the exchange bias (EB) effect in nanoparticles with core/shell structure aimed to unveil the microscopic origin of some of the experimental phenomenology associated to this effect. In particular, we have focused our study on the particle size and field cooling dependence of the hysteresis loop shifts. To this end, hysteresis loops after a field cooling process have been computed by means of Monte Carlo simulations based on a model that takes into account the peculiar properties of the core, shell and interfacial regions of the particle and the EB and coercive fields have been extracted from them. The results show that, as a general trend, the EB field $h_{EB}$ decreases with increasing particle size, in agreement with some experimental observations. However, closer inspection reveals notable oscillations of $h_{EB}$ as a function of the particle radius which we show to be closely related to the net magnetization established after field cooling at the interfacial shell spins. For a particle with ferromagnetic interface coupling, we show that the magnitude and sign of $h_{EB}$ can be varied with the magnetic field applied during the cooling process.
description: Submitted to J. Phys. D (10 pages, 10 figures)
Προγραμματισμός συσκευής δρομολόγησης
Creators: name: Προκοπίδης, Γεώργιος
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Δρομολόγηση
Αλγόριθμος
Routing
CISCO
Dynamic Routing
Drip
EigrP
Ospf

description: Περιγράφω αναλυτικά το πώς γίνεται configuration σε ένα Router υλοποιούνται δύο σενάρια
description: Describe the configuration of a router running 3 protocols, IRGD, RIP-OSFP
Imaging trapped ion structures via fluorescence cross-correlation detection
Creators: name: Richter, Stefan
name: Wolf, Sebastian
name: von Zanthier, Joachim
name: Schmidt-Kaler, Ferdinand
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Cross-correlation signals are recorded from fluorescence photons scattered in free space off a trapped ion structure. The analysis of the signal allows for unambiguously revealing the spatial frequency, thus the distance, as well as the spatial alignment of the ions. For the case of two ions we obtain from the cross-correlations a spatial frequency $f_\text{spatial}=1490 \pm 2_{stat.}\pm 8_{syst.}\,\text{rad}^{-1}$, where the statistical uncertainty improves with the integrated number of correlation events as $N^{-0.51\pm0.06}$. We independently determine the spatial frequency to be $1494\pm 11\,\text{rad}^{-1}$, proving excellent agreement. Expanding our method to the case of three ions, we demonstrate its functionality for two-dimensional arrays of emitters of indistinguishable photons, serving as a model system to yield structural information where direct imaging techniques fail.
Screening in 2D: GW calculations for surfaces and thin films using the repeated-slab approach
Creators: name: Freysoldt, Christoph
name: Eggert, Philipp
name: Rinke, Patrick
name: Schindlmayr, Arno
name: Scheffler, Matthias
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In the context of photoelectron spectroscopy, the $GW$ approach has developed into the method of choice for computing excitation spectra of weakly correlated bulk systems and their surfaces. To employ the established computational schemes that have been developed for three-dimensional crystals, two-dimensional systems are typically treated in the repeated-slab approach. In this work we critically examine this approach and identify three important aspects for which the treatment of long-range screening in two dimensions differs from the bulk: (1) anisotropy of the macroscopic screening (2) $\mathbf k$-point sampling parallel to the surface (3) periodic repetition and slab-slab interaction. For prototypical semiconductor (silicon) and ionic (NaCl) thin films we quantify the individual contributions of points (1) to (3) and develop robust and efficient correction schemes derived from the classic theory of dielectric screening.
description: 11 pages, 10 figures, PRB accepted
A Cosmological Model with Dark Spinor Source
Creators: name: Gu, Ying-Qiu
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper, we discuss the system of Friedman-Robertson-Walker metric coupling with massive nonlinear dark spinors in detail, where the thermodynamic movement of spinors is also taken into account. The results show that, the nonlinear potential of the spinor field can provide a tiny negative pressure, which resists the Universe to become singular. The solution is oscillating in time and closed in space, which approximately takes the following form $$ g_{μν}=\bar R^2(1-δ\cos t)^2\diag(1,-1,-\sin^2r ,-\sin^2r \sin^2θ), $$ with $\bar R= (1\sim 2)\times 10^{12}$ light year, and $δ=0.96\sim 0.99$. The present time is about $t\sim 18^\circ$.
description: 13 pages, no figure, to appear in IJMPA
Classification of High-resolution Solar Hα Spectra using t-distributed Stochastic Neighbor Embedding
Creators: name: Verma, Meetu
name: Matijevič, Gal
name: Denker, Carsten
name: Diercke, Andrea
name: Dineva, Ekaterina
name: Balthasar, Horst
name: Kamlah, Robert
name: Kontogiannis, Ioannis
name: Kuckein, Christoph
name: Pal, Partha S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Hα spectral line is a well-studied absorption line revealing properties of the highly structured and dynamic solar chromosphere. Typical features with distinct spectral signatures in Hα include filaments and prominences, bright active-region plages, superpenumbrae around sunspots, surges, flares, Ellerman bombs, filigree, and mottles and rosettes, among others. This study is based on high-spectral resolution Hα spectra obtained with the echelle spectrograph of the Vacuum Tower Telescope (VTT) located at Observatorio del Teide (ODT), Tenerife, Spain. The t-distributed Stochastic Neighbor Embedding (t-SNE) is a machine learning algorithm, which is used for nonlinear dimensionality reduction. In this application, it projects Hα spectra onto a two-dimensional map, where it becomes possible to classify the spectra according to results of Cloud Model (CM) inversions. The CM parameters optical depth, Doppler width, line-of-sight velocity, and source function describe properties of the cloud material. Initial results of t-SNE indicate its strong discriminatory power to separate quiet-Sun and plage profiles from those that are suitable for CM inversions. In addition, a detailed study of various t-SNE parameters is conducted, the impact of seeing conditions on the classification is assessed, results for various types of input data are compared, and the identified clusters are linked to chromospheric features. Although t-SNE proves to be efficient in clustering high-dimensional data, human inference is required at each step to interpret the results. This exploratory study provides a framework and ideas on how to tailor a classification scheme towards specific spectral data and science questions.
description: 16 pages, 14 figures, Accepted to be published in Astrophysical Journal
Explicit Construction of First Integrals with Quasi-monomial Terms from the Painlevé Series
Creators: name: Efthymiopoulos, Christos
name: Bountis, Tassos
name: Manos, Thanos
Publisher: name: arXiv
Year: 2008
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: The Painlevé and weak Painlevé conjectures have been used widely to identify new integrable nonlinear dynamical systems. For a system which passes the Painlevé test, the calculation of the integrals relies on a variety of methods which are independent from Painlevé analysis. The present paper proposes an explicit algorithm to build first integrals of a dynamical system, expressed as `quasi-polynomial' functions, from the information provided solely by the Painlevé - Laurent series solutions of a system of ODEs. Restrictions on the number and form of quasi-monomial terms appearing in a quasi-polynomial integral are obtained by an application of a theorem by Yoshida (1983). The integrals are obtained by a proper balancing of the coefficients in a quasi-polynomial function selected as initial ansatz for the integral, so that all dependence on powers of the time $τ=t-t_0$ is eliminated. Both right and left Painlevé series are useful in the method. Alternatively, the method can be used to show the non-existence of a quasi-polynomial first integral. Examples from specific dynamical systems are given.
description: 16 pages, 0 figures
The treatment of copper-gold ores by ammonium thiosulfate leaching
Creators: name: Molleman, Ellen
Publisher: name: University of British Columbia
Year: 2009

description: The application of ammonium thiosulfate for the treatment of copper-gold ores has been investigated. Leaching studies were conducted with copper minerals, copper minerals with gold addition to solution and copper-gold samples of different copper and gold grades. The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide minerals chalcopyrite and enargite seem to be unreactive toward an ammonium thiosulfate leach. Covellite and chalcocite leach to a slight extent in this leaching system. The copper extractions of the sulfide minerals seem to be independent of the availability of complexing agents. The copper oxide minerals cuprite and malachite showed high copper extractions in the presence of sufficient lixiviant. Experiments showed that both gold extraction and thiosulfate stability are influenced by a combination of aeration and cupric ions in solution. High initial gold extractions were achieved in an aerated solution in the presence of cupric ions. However, these conditions simultaneously catalyzed thiosulfate degradation, resulting in gold precipitation. Therefore, it is important to establish a balance between providing sufficient air and cupric ions for fast gold dissolution, and to minimize the amount of air in the presence of cupric ions to prevent excessive thiosulfate degradation. A promising potential alternative to these conditions is a 24 hour leach without forced aeration.
MPEC 2024-A58 : 2019 KK5
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

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.
Discovery of a Faint Old Stellar System at 150 kpc
Creators: name: Sakamoto, T.
name: Hasegawa, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the detection of a faint old stellar system at $(α,δ)=(194.29^\circ,~34.32^\circ)$ (SDSS J1257+3419), based on the spatial distribution of bright red-giant branch stars in the Sloan Digital Sky Survey Data Release 4. SDSS J1257+3419 has a half-light radius of $38\pm 12$ pc and an absolute integrated $V$-magnitude of $M_V=-4.8^{+1.4}_{-1.0}$ mag at a heliocentric distance of $150\pm 15$ kpc. A comparison between SDSS J1257+3419 and known Galactic halo objects suggests that SDSS J1257+3419 is either (a) a faint and small dwarf galaxy or (b) a faint and widely extended globular cluster. In the former case, SDSS J1257+3419 could represent an entity of a postulated subhalo of the Milky Way. Further photometric and dynamical study of this stellar system is vital to discriminate these possibilities.
description: 7pages, 3 figures, accepted by Astrophysical Journal Letter
Δισδιάστατη αντιστροφή δεδομένων τομογραφίας σεισμικής διάθλασης
Creators: name: Μπογιατζής, Πέτρος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Αντιστροφή
Τομογραφία
Σεισμική
Διάθλαση
Κοινωνικοποίηση
Εξομάλυνση
Inversion
Regularization
Seismic
Tomography
Fresnel
Refraction

description: Στη διατριβή αναπτύχθηκαν αλγόριθμοι και διερευνήθηκαν μέθοδοι και εξήχθησαν συμπεράσματα όσον αφορά την επίλυση του ευθέος και του αντίστροφου προβλήματος στην τομογραφία χρόνων των πρώτων αφίξεων (διάθλασης). Αρχικά παρουσιάζονται οι βασικές αρχές, η φύση και η φυσική, του ευθέος και αντίστροφου προβλήματος στη σεισμική διάθλαση. Στη συνέχεια παρουσιάζονται οι βελτιώσεις που επιφέρει η εισαγωγή των ζωνών Fresnel στην επίλυση του ευθέος προβλήματος. Γίνεται επιπλέον σύγκριση του προσεγγιστικού τρόπου υπολογισμού τους σε σχέση με τον ακριβή. Η χρήση των ζωνών Fresnel σε συνδυασμό με τη βελτιωμένη μέθοδο κάμψης της σεισμικής ακτίνας με τη χρήση "Beta-splines", παρέχει μια αξιόπιστη μέθοδο επίλυσης του ευθέος προβλήματος. Επιπροσθέτως με τη χρήση της θεωρίας γραφημάτων και ενός βελτιωμένου αλγορίθμου Dijkra επιτυγχάνεται εξαιρετική ευστάθεια της μεθόδου κάμψης. Στο αντίστροφο πρόβλημα εισάγεται η ιδέα του χωρικά μεταβαλλόμενου συντελεστή κανονικοποίησης. Με αυτό τον τρόπο επιτυγχάνεται ταυτόχρονα σταθερότερες λύσεις με τη μικρότερη δυνατή κανονικοποίηση. Η μέθοδος αυτή είναι εξαιρετικά χρήσιμη και αποτελεσματική σε ασθενώς καθορισμένα προβλήματα, με υποβαθμισμένα ποιοτικά δεδομένα, ανομοιόμορφα κατανεμημένα στο χώρο
description: In this thesis have been developed algorithms, studied methods and made conclusions about forward and inverse seismic refraction tomography problem. Initially has been presented the nature and the physics of the subject. Next, have been analysed the improvements that induced the Fresnel zones theory, especially the differences between exact and approximate calculation methods. Further more with the combination of the improved ray bending method by the use of Beta splines interpolation feature, and graph theory first approach by using a diskstra-like algorithm are generated exact and stable solutions. Inverse problem is also improved by the use of a spacially varging regularization multiplyer. This produces mov. accurate, stable, solutions with less regularization possible. It is very useful especially with ill-conditioned bad resolved problems
Imaging polarimetry and photometry of comet 21P/Giacobini-Zinner
Creators: name: Zubko, E. Chornaya E.
name: Luk'yanyk, I.
name: Kochergin, A.
name: Zheltobryukhov, M.
name: Ivanova, O. V.
name: Kornienko, G.
name: Matkin, A.
name: Baransky, A.
name: Molotov, I. E.
name: Sharoshchenko, V. S.
name: Videen, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We report results of polarimetric observations of comet 21P/Giacobini-Zinner made at phase angles, α=76-78 deg, between 10 and 17 of September 2018, and compare them with previous measurements. We find significant variations in the polarimetric signals that appear consistent with those reported previously. These variations and subsequent modeling suggest that the particles in the coma are replenished within a period of approximately one day. This period is significantly shorter for highly absorbing carbonaceous particles than for non-absorbing Mg-rich silicate particles. Such a difference in the relative abundances of these components can lead to variations in the polarization response of the coma. The strong positive polarization in the subsolar direction suggests a large relative abundance of carbonaceous material, which may be an indicator of jet-type activity.
description: 11 pages, 6 figures
Η εκπαίδευση των παιδιών μεταναστών/ριών στην αρθρογραφία των εκπαιδευτικών περιοδικών
Creators: name: Σαμανίδης, Νικόλαος Ιακώβου
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Εκπαίδευση μεταναστών
Ρατσισμός
Ενταξη
Αφομοίωση
Πολυπολιτισμικότητα
Μεταναστευτικές οργανώσεις
Immigrant education
Racism
Incorporation
Assimilation
Multicultural
Immigrant organization

description: Η εκπαίδευση και εγκατάσταση στην Ελλάδα τις τελευταίες δεκαετίες εκατοντάδων χιλιάδων μεταναστών άλλαξε ριζικά την σύνθεση του μαθητικού πληθυσμού. Η παρουσία των μεταναστόσουλων στα ελληνικά σχολεία δημιούργησε νέα δεδομένα. Αντικείμενο της έρευνας αποτέλεσε η συλλογή και κριτική προσέγγιση της αρθρογραφίας που φιλοξενήθηκε στον εκπαιδευτικό περιοδικό τύπο την περίοδο 1990-2005 και αφορά στην εκπαίδευση των παιδιών των μεταναστών. Η έρευνα οδήγησε στην διαπίστωση της ύπαρξης κυρίαρχης τα΄σης η οποία, με ασαφείς θεωρητικές παραδοχές και ουδέτερου τύπου προσεγγίσεις του κοινωνικού πλαίσιου, προβάλλει και στηρίζει τις πολιτικές που κυριαρχούν σε Ευρώπη και Ελλάδα σχετικά με την ένταξη των μεταναστών σε κοινωνία και εκπαίδευση. Με μικρότερη παρουσία, λιγότερη συνοχή αλλά και με σαφή κινηματικό προσανατολισμό και αναφορές στις αντιρατσιστικε΄ς και μεταναστευτικές οργανώσεις συναντάμε στην αρθρογραφία τις μαρξιστικές-ριζοσπαστικές απόψεις. Αφομοιωτικές λογικές και προτάσεις υποστηρίζονται αποκλειστικά και μόνο από τον Αθ. Γκότοβο
description: The education and settlement of thousands of immigrants in Greece, during the last decades, has utterly changed the composition of the student population. The presence of the young immigrants in greek schools has created a new state of affairs. The collection and critical review of the articles-concerning the children of immigrants that were found in the educational magazines, from 1990 to 2005 is the object of this research. The research led to the discovery of a dominant tendency, which under vague theoretical admissions and neutral appoaches, presents and supports the dominant politics is relevance to the incorporation of immigrants in the society and education, in both Greece and Europe. The marxist and radical views are minor in presence, but come forward within a clear movement view and references to the antiracist and immigration organizations. Assimcaltive views and suggestions are supported only by A. Gotovos
title: EXPLORING THE DYNAMICS OF PARENT-ADOLESCENT COMMUNICATION
title: THE INFLUENCE OF SEXUAL OBJECTIFICATION IN MUSIC MEDIA, DYAD GENDER, CONVERSATIONAL TONE, AND FREQUENCY
titleType: Subtitle
Creators: name: McAllister, Cristina
Publisher: name: Washington State University
Year: 2024
Subjects: Communication
Media
Parent-Adolescent

description: Parent-adolescent communication can influence adolescents’ ability to navigate romantic relationships, sex, and their understanding of media messages. Media use is prevalent among teens which increases exposure to potentially harmful media messages. Parents, usually mothers, who speak frequently with their teens about these topics can be a protective factor. Research is needed to understand how the gender of the parent and teen who are conversing influences these conversations. Additionally, research has called for the examination of conversational quality to be considered along with overall frequency of communication. When parents lecture or dominate a conversation, it is possible that regardless of the frequency of communication, teens are less likely to retain information. This study examines fifty parent-adolescent dyads using a combination of self-reported and observational data to understand parent-adolescent communication about music-media stimuli containing messages about romantic relationships, sexual objectification, and dating violence. Participants independently reported on their perceptions of sexual objectification within the music-media stimuli. Then they were brought
description: together as a dyad to watch each of the three music-media stimuli and have discussions about what they watched. Results indicated that sexual objectification was more likely to be identified in the music-media stimuli by mothers than their daughters, fathers and sons. For conversational quality, the results were non-significant. However, the time that parents and teens spent talking was significant for mixed-gender dyads discussing the first video. Findings suggest that mixed-gender dyads spent more time talking about healthy romantic relationships than same gender dyads.
Deepfakes and Detection of Synthetic Media using Efficient Net & Vision Transformers
Creators: name: Mithilesh M Nimbalkar
Publisher: name: Zenodo
Year: 2024

description: In today's world access to freely available public databases and with fast-growing progress of deeplearning techniques in a Particular GAN (Generative Adversarial Networks) has led these todaygenerations to create very realistic fake content with the help of apps.This survey provides a deep reviewof detection techniques for synthetic media (Deepfakes)
Harmonic measure and SLE
Creators: name: Beliaev, D.
name: Smirnov, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Complex Variables (math.CV)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: In this paper we rigorously compute the average multifractal spectrum of harmonic measure on the boundary of SLE clusters.
Thermal compression of atomic hydrogen on helium surface
Creators: name: Järvinen, J.
name: Ahokas, J.
name: Vasiliev, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We describe experiments with spin-polarized atomic hydrogen gas adsorbed on liquid $^{4}$He surface. The surface gas density is increased locally by thermal compression up to $5.5\times10^{12}$ cm$^{-2}$ at 110 mK. This corresponds to the onset of quantum degeneracy with the thermal de-Broglie wavelength being 1.5 times larger than the mean interatomic spacing. The atoms were detected directly with a 129 GHz electron-spin resonance spectrometer probing both the surface and the bulk gas. This, and the simultaneous measurement of the recombination power, allowed us to make accurate studies of the adsorption isotherm and the heat removal from the adsorbed hydrogen gas. From the data, we estimate the thermal contact between 2D hydrogen gas and phonons of the helium film. We analyze the limitations of the thermal compression method and the possibility to reach the superfluid transition in 2D hydrogen gas.
description: 20 pages, 11 figures
Network topology of the Argentine interbank money market
Creators: name: Forte, Federico
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: This paper provides the first empirical network analysis of the Argentine interbank money market. Its main topological features are examined applying graph theory, focusing on the unsecured overnight loans settled from 2003 to 2017. The network, where banks are the nodes and the operations between them represent the links, exhibits low density, a higher reciprocity than comparable random graphs, short average distances and its clustering coefficient remains above that of a random network of equal size. Furthermore, the network is prominently disassortative. Its structural metrics experienced significant volatility, in correlation with the economic activity fluctuations and regulatory shifts. Signs of nodes' random-like behavior are detected during contractions. The degree distributions fit better to a Lognormal distribution than to a Poisson or a Power Law. Additionally, different node centrality measures are computed. It is found that a higher centrality enables a node to settle more convenient bilateral interest rates compared to the average market rate, identifying a statistical and economically significant effect by means of a regression analysis. These results constitute a relevant input for systemic risk assessment and provide solid empirical foundations for future theoretical modelling and shock simulations, especially in the context of underdeveloped financial systems.
description: 24 pages, 8 figures, 4 tables
Carly L. Crouch & Jonathan Stökl (eds.): In the Name of God. The Bible in the Colonial Discourse of Empire
Creators: name: Becker, Judith
Publisher: name: Ruhr-Universität Bochum
Year: 2015

description: This contribution offers a review of

Carly L. Crouch & Jonathan Stökl (eds.): In the Name of God. The Bible in the Colonial Discourse of Empire, Biblical Interpretation Series 126.

Leiden: Brill, 2014. viii and 192 pages, € 98, ISBN 978-900-425-8334.
description: Entangled Religions, Vol 2 (2015)
Προσομοίωση στη διαχείριση έργων πληροφορικής
Creators: name: Ρουβάς, Σπυρίδων Ανδρέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Διαχείριση έργων
Ανάπτυξη λογισμικού
Προσομοίωση
Δυναμικό μοντέλο
Μελέτη περίπτωσης
Project management
Software development
Simulation
System dynamics
Case study
Powersim

description: Στην παρούσα εργασία γίνεται αρχικά μια βιβλιογραφική έρευνα για τις χρήσεις της προσομοίωσης και των δυναμικών μοντέλων στη μοντελοποίηση της διαδικασίας ανάπτυξης του λογισμικού και στη συνέχεια κατασκευάζεται δυναμικό μοντέλο για να μελετηθεί η διαδικασία διαχείρισης έργου μιας εταιρείας πληροφορικής βάσει πραγματικών στοιχείων
description: In the present study initially there is a review of greek and foreign articles / publications on simulation in software project management and afterwards, a dynamic model is constructed in aim to study the software process modeling of a greek firm based on real data
A Non-Orthogonal Distributed Space-Time Coded Protocol Part II-Code Construction and DM-G Tradeoff
Creators: name: Rajan, G. Susinder
name: Rajan, B. Sundar
Publisher: name: arXiv
Year: 2006
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This is the second part of a two-part series of papers. In this paper, for the generalized non-orthogonal amplify and forward (GNAF) protocol presented in Part-I, a construction of a new family of distributed space-time codes based on Co-ordinate Interleaved Orthogonal Designs (CIOD) which result in reduced Maximum Likelihood (ML) decoding complexity at the destination is proposed. Further, it is established that the recently proposed Toeplitz space-time codes as well as space-time block codes (STBCs) from cyclic division algebras can be used in GNAF protocol. Finally, a lower bound on the optimal Diversity-Multiplexing Gain (DM-G) tradeoff for the GNAF protocol is established and it is shown that this bound approaches the transmit diversity bound asymptotically as the number of relays and the number of channels uses increases.
description: Proceedings 2006 IEEE Information Theory Workshop, Chengdu, China (5 pages, No figures)
Graviton production with 2 jets at the LHC in large extra dimensions
Creators: name: Hagiwara, Kaoru
name: Konar, Partha
name: Li, Qiang
name: Mawatari, Kentarou
name: Zeppenfeld, Dieter
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study Kaluza-Klein (KK) graviton production in the large extra dimensions model via 2 jets plus missing transverse momentum signatures at the LHC. We make predictions for both the signal and the dominant Zjj and Wjj backgrounds, where we introduce missing P_T-dependent jet selection cuts that ensure the smallness of the 2-jet rate over the 1-jet rate. With the same jet selection cuts, the distributions of the two jets and their correlation with the missing transverse momentum provide additional evidence for the production of an invisible massive object.
description: 8 pages, 10 figures, 1 table; Version to be printed in JHEP
Calcarisporium yuanyangense Zhu & Tang & Liu & Luo & Yu 2023
Creators: name: Zhu, Juye
name: Tang, Dexiang
name: Liu, Zuoheng
name: Luo, Lijun
name: Yu, Hong
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Fungi
Ascomycota
Sordariomycetes
Hypocreales
Ophiostomataceae
Calcarisporium
Calcarisporium yuanyangense

description: Calcarisporium yuanyangense H. Yu bis & J.Y. Zhu, sp. nov. Fig. 2
MycoBank: MB 848860
Etymology:— The epithet “ yuanyangense ” referred to collection sites for this species, Yuanyang County.
Holotype:— Xinjie Town, Yuanyang County, Yunnan Province, China (23°04′42.98″N, 102°51′41.61″E, alt. 2053.70m), on an O. nutans, September 25, 2022, Hong Yu bis, YHH 2209025, holotype; YFCC 22099256, ex-type living culture.
Description:—Sexual morph: Sexual morphs were not found. Asexual morph: Colonies effuse, woolly-felty texture, yellowish-white, mycelium immersed, consisting of branched, septate, smooth, hyaline hyphae, hyphae 1.81– 2.89 μm wide. colonies on PDA reached 20–22 mm in diameter after 10 days at 25 ℃. Conidiophores 12.49–119.42 × 1.49–3.01 μm, erect, hyaline, verticillately branched, with 1–5 verticils, each verticil with 1–5 conidiogenous cells. Conidiogenous cells 12.31–51.84 × 1.40–3.08 μm, hyaline, swollen at base, gradually tapering near the apex, holoblastic to polyblastic, sympodial, apically with a cluster of conidium-bearing denticles. conidiogenous scars 0.86–1.78μm. Conidia 6.33–9.68 × 1.87–2.63 μm, unicellular, hyaline, smooth-walled, thin-walled, ovoid to ellipsoid, acuminate.
Know distribution:— Xinjie Town, Yuanyang County, Yunnan Province, China.
Note:— Calcarisporium yuanyangense was isolated from O. nutans and was different from the host reported in previous studies. Calcarisporium yuanyangense was identified as a unique species based on both morphological characteristics and phylogenetic analysis; both demonstrate that it was distinct from other recognized species in the genus Calcarisporium. Phylogenetic analysis based on five genes showed strong support (BP = 100% and PP = 100%) with being an independent branch. Calcarisporium yuanyangense and C. arbuscula were similar in conidia shape, but the conidia of C. yuanyangense (6.33–9.68 × 1.87–2.63 μm) were larger and had a higher length/width ratio than those of C. arbuscula (Table 2).
description: Published as part of Zhu, Juye, Tang, Dexiang, Liu, Zuoheng, Luo, Lijun & Yu, Hong, 2023, Calcarisporium yuanyangense sp. nov. (Calcarisporiaceae, Hypocreales), a fungal pathogen isolated from Ophiocordyceps nutans, pp. 272-282 in Phytotaxa 612 (3) on page 278, DOI: 10.11646/phytotaxa.612.3.3, http://zenodo.org/record/8323590
Συγκριτική μελέτη μοντέλων τιμολόγησης υπηρεσιών πληροφορικής
Creators: name: Παύλου, Ιωάννα
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Υπηρεσίες πληροφορικής
Τιμολόγηση
Κοστολόγηση
Μοντέλο τιμολόγησης
Διαχείριση επιπέδου υπηρεσίας
IT services
Cost model
Pricing model
Outscourcing
ASP
Service Level Management

description: Στην παρούσα εργασία γίνεται μια παρουσίαση του μοντέλου του Outsourcing και του ASP καθώς και των προτεινόμενων στη διεθνή βιβλιογραφία βέλτιστων τρόπων υλοποίησης αυτών. Κατόπιν εξετάζεται το φλέγον ζήτημα της κοστόλογησης και τιμολόγησης υπηρεσιών πληροφορικής και παρουσιάζονται τα μοντέλα κοστολόγησης και τιμολόγησης που συναντώνται στη διεθνή βιβλιογραφία. Τέλος προτείνεται ένα μοντέλο το οποίο ικανοποιεί τις ανάγκες μιας συγκεκριμένης μελέτης περίπτωσης
description: Analysis of the new outsourcing and ASP model for IT services. Review of the suggested practices for successful implementation Literature review of the costing and pricing models for IT services. Case study for a specific ASP company and proposal of a specific costing and pricing model
High resolution gamma ray spectroscopy of flares on the east and west limbs of the Sun
Creators: name: Harris, M. J.
name: Tatischeff, V.
name: Kiener, J.
name: Gros, M.
name: Weidenspointner, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A new generation of Ge-based high-resolution gamma-ray spectrometers has allowed accurate measurements to be made of the profiles, widths and energies of the gamma-ray lines emitted in the impulsive phases of solar flares. Here we present measurements in two flares of the energies of the de-excitation lines of 12C and 16O at 4.4 and 6.1 MeV respectively by the Ge spectrometer SPI on board INTEGRAL, from which Doppler shifts are derived and compared with those expected from the recoil of 12C and 16O nuclei which were excited by the impacts of flare-accelerated ions. An anomalous Doppler measurement (in terms of recoil theory) has been reported by the Ge spectrometer RHESSI in a flare near the east limb, and explained by a tilt of the magnetic field lines at the footpoint of a magnetic loop away from the vertical, and towards the observer. This might be interpreted to imply a significant difference between the Doppler shifts on the east and west limbs, if it is a general phenomenon. SPI observed both east and west limb flares and found no significant difference in Doppler shifts. We also measured the shapes and fluences of these lines, and their fluence ratio to the 2.2 MeV line from the capture of flare-generated neutrons. Analyses of both quantities using thick-target models parametrized by solar physical and geometric quantities suggest that the two flares studied here also have magnetic fields tilted towards the observer, though the significance of the measurements is not high.
description: 9 pp., 7 figs., accepted by A&A
Applications of Operations Research in Airline Industry
Creators: name: Aman Pandey, Shikha Dangwal, Karishma Dhawan, Vidushee Sharma, Nidhi Jain
Publisher: name: Zenodo
Year: 2024

description: Airlines handle a large number of passengers and flights on a daily basis, requiring robustoperations strategies. Previous publications and literature have highlighted the importance ofscheduling and forecasting for airlines to be able to survive profitably. As a result, there is a needfor models based on mathematical and statistical fundamentals to forecast uncertain conditions inthis sector and derive the most fruitful alternatives.This paper examines several critical issues: Fleet Assignment Problem, Airline Crew Scheduling,Seat Assignment Problem, Airport Gate Assignment Problem, Transportation Problem, RevenueManagement, Maintenance Routing, Passenger delay costs,The findings and analysis demonstrate the real-world applications of the tools proposed in