cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Conditions for Star Formation at Low Metallicity: Results from the LMC
Creators: name: Oliveira, J. M.
name: van Loon, J. Th
name: Stanimirovic, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present our recent work on the conditions under which star formation occurs in a metal-poor environment, the Large Magellanic Cloud ([Fe/H] ~ -0.4). Water masers are used as beacons of the current star formation in HII regions. Comparing their location with the dust morphology imaged with the Spitzer Space Telescope, and additional Halpha imaging and groundbased near-infrared observations, we conclude that the LMC environment seems favourable to sequential star formation triggered by massive star feedback (Oliveira et al. 2006). Good examples of this are 30 Doradus and N 113. There are also HII regions, such as N 105A, where feedback may not be responsible for the current star formation although the nature of one young stellar object (YSO) suggests that feedback may soon start making an impact. The chemistry in one YSO hints at a stronger influence from irradiation effects in a metal-poor environment where shielding by dust is suppressed (van Loon 2005)
description: in "Triggered Star Formation in a Turbulent ISM", IAU symposium, poster contribution; a better quality version of this manuscript can be found at http://www.astro.keele.ac.uk/~jacco/papers/proc.ps a full version of the poster can be found at http://www.astro.keele.ac.uk/~jacco/papers/IAUS237_LMC_2006.pdf
Evolution of entanglement within classical light states
Creators: name: Stevenson, R. Mark
name: Hudson, Andrew J.
name: Bennett, Anthony J.
name: Young, Robert J.
name: Nicoll, Christine A.
name: Ritchie, David A.
name: Shields, Andrew J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the evolution of quantum correlations over the lifetime of a multi-photon state. Measurements reveal time-dependent oscillations of the entanglement fidelity for photon pairs created by a single semiconductor quantum dot. The oscillations are attributed to the phase acquired in the intermediate, non-degenerate, exciton-photon state and are consistent with simulations. We conclude that emission of photon pairs by a typical quantum dot with finite polarisation splitting is in fact entangled in a time-evolving state, and not classically correlated as previously regarded.
Model for vacancy-induced d$^0$ ferromagnetism in oxide compounds
Creators: name: Bouzerar, Georges
name: Ziman, Timothy
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose a model with few parameters, for vacancy-induced ferromagnetism based on a correlated model for anions (oxygen orbitals) with random potentials that represent cation vacancies. There is a range of potential strength for which moments appear on oxygen sites neighboring the vacancies. By using techniques which allow us to treat the randomness exactly, we calculate the magnetic couplings between the total moment around each vacancy, the Curie temperature and dynamical correlations as a function of the effective stren gth of the vacancy potential and doping properties, the density of vacancies, as well as the correlation and band width of the host. For physically reasonable parameters this predicts Curie temperatures well above room temperature for small concentrations of vacancies and appropriate parameters. We disc uss our results in relation to questions of stability and reproducibility raised in experiments. To circumvent the difficulties of controlling intrinsic defects, we propose specific non-magnetic host doping that could be, for example, substituted for cations in HfO$_2$ or ZrO$_2$.
description: 4 figures + tex files. Accepted for publication in Physical Review Letters. Note that the title has changed and the text is slightly modified
Experimental growth law for bubbles in a "wet" 3D liquid foam
Creators: name: Lambert, Jérôme
name: Mokso, Rajmund
name: Cantat, Isabelle
name: Cloetens, Peter
name: Delannay, Renaud
name: Glazier, James A.
name: Graner, François
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We used X-ray tomography to characterize the geometry of all bubbles in a liquid foam of average liquid fraction $ϕ_l\approx 17 %$ and to follow their evolution, measuring the normalized growth rate $\mathcal{G}=V^{-{1/3}}\frac{dV} {dt}$ for 7000 bubbles. While $\mathcal{G}$ does not depend only on the number of faces of a bubble, its average over $f-$faced bubbles scales as $G_f\sim f-f_0$ for large $f$s at all times. We discuss the dispersion of $\mathcal{G}$ and the influence of $V$ on $\mathcal{G}$.
description: 10 pages, submitted to PRL
Electromagnetic Model of Reflective Intelligent Surfaces
Creators: name: Costa, Filippo
name: Borgese, Michele
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Information Theory (cs.IT)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: An accurate and simple analytical model for the computation of the reflection amplitude and phase of Reconfigurable Intelligent Surfaces is presented. The model is based on a transmission-line circuit representation of the RIS which takes into account the physics behind the structure including the effect of all relevant geometrical and electrical parameters. The proposed representation of the RIS allows to take into account the effect of incidence angle, mutual coupling among elements and the effect of the interaction of the periodic surface with the RIS ground plane. It is shown that the proposed approach allows to design a physically realisable RIS without recurring to onerous electromagnetic simulations. The proposed model aims at filling the gap between RIS assisted communications algorithms and physical implementation issues which determine realistic performance of these surfaces.
description: 11 pages, 13 figures
Spin constraints on Regge predictions and perturbative evolution in high energy collisions
Creators: name: Bass, Steven D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Two key issues in the application of perturbative QCD and Regge predictions to high energy processes are whether the hard and soft pomerons should be considered as two separate distinct exchanges and whether the Regge intercepts are Q^2 independent or not. Models involving a distinct hard pomeron exchange predict much larger values for the LHC total cross-section. Here we argue that there is a polarized analogue of this issue in the isovector part of the spin structure function g_1 and that the spin data appear to favour a distinct hard exchange.
description: 8 pages
Global variables for various centralities at RHIC: a Cracow model approach
Creators: name: Prorok, Dariusz
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The final $p_{T}$-spectra measured at RHIC at $\sqrt{s_{NN}}=130$ and 200 GeV are fitted within the Cracow single-freeze-out model. Then the global variables like the transverse energy at midrapidity, the charged particle multiplicity at midrapidity and the total multiplicity of charged particles are evaluated. The predictions agree fairly well with the experimental data. The centrality independence of the total number of charged particles per participant pair has been also reproduced.
description: Talk given at the XLVI Cracow School of Theoretical Physics, May 27-June 5, 2006, Zakopane, Poland
Machine Learning Based Cyber Attacks Targeting on Controlled Information: A Survey
Creators: name: Miao, Yuantian
name: Chen, Chao
name: Pan, Lei
name: Han, Qing-Long
name: Zhang, Jun
name: Xiang, Yang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Stealing attack against controlled information, along with the increasing number of information leakage incidents, has become an emerging cyber security threat in recent years. Due to the booming development and deployment of advanced analytics solutions, novel stealing attacks utilize machine learning (ML) algorithms to achieve high success rate and cause a lot of damage. Detecting and defending against such attacks is challenging and urgent so that governments, organizations, and individuals should attach great importance to the ML-based stealing attacks. This survey presents the recent advances in this new type of attack and corresponding countermeasures. The ML-based stealing attack is reviewed in perspectives of three categories of targeted controlled information, including controlled user activities, controlled ML model-related information, and controlled authentication information. Recent publications are summarized to generalize an overarching attack methodology and to derive the limitations and future directions of ML-based stealing attacks. Furthermore, countermeasures are proposed towards developing effective protections from three aspects -- detection, disruption, and isolation.
description: Published in ACM Computing Surveys
Electrical polarization of nuclear spins in a breakdown regime of quantum Hall effect
Creators: name: Kawamura, M.
name: Takahashi, H.
name: Sugihara, K.
name: Masubuchi, S.
name: Hamaya, K.
name: Machida, T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have developed a method for electrical polarization of nuclear spins in quantum Hall systems. In a breakdown regime of odd-integer quantum Hall effect (QHE), excitation of electrons to the upper Landau subband with opposite spin polarity dynamically polarizes nuclear spins through the hyperfine interaction. The polarized nuclear spins in turn accelerate the QHE breakdown, leading to hysteretic voltage-current characteristics of the quantum Hall conductor.
description: 3 pages, 4 figures, submitted to Appl. Phys. Lett
The philosophy of filiality in ancient China : ideological development of ancestor worship in the Zhanguo period
Creators: name: Ikezawa, Masaru
Publisher: name: University of British Columbia
Year: 2009

description: Filiality (xiao) has been a significant concept in Chinese culture. Its significance is shown by the fact that its idea was elevated to a system of philosophy by Confucians in the Zhanguo period (475-221 B.C.E.). The purpose of this study is to clarify why filiality was important and what the philosophy of filiality essentially meant. Filiality was not merely a familial ethic. In the Western Zhou period (the 11th c. to 770 B.C.E.), it meant sacrifices to ancestors. Filiality toward fatherhood was essentially obedience to headship of lineage groups, and it was expressed in ancestor worship. When lineage gradually collapsed in the Chunqiu period (770-475 B.C.E.), its significance must have been restricted. In fact, however, filiality was given a new meaning by Zhanguo Confucians. First, Confucius emphasized the mental aspect of filiality, and then Mencius thought of filiality as the basis from which general ethics were generated. The various ideas of filiality were collected in a book: the Book of Filiality. This book, presenting the dichotomy between love and reverence, argued that a father-son relationship had an element shared by a monarch-retainer relationship and that filiality should be shifted into loyalty. The essential achievement of this philosophy was the recognition of the dualistic nature of human beings; any human relationship was a social relation between two social roles as well as an emotional connection between two characters. The former was the basis for culture and society. It was the aspect of culture inherent in human nature that should be developed to bring about social justice. This dualism was derived from the ambiguity of fatherhood in ancestor worship. As ancestor symbolized the social role of lineage headship, the philosophy of filiality symbolically connected fatherhood to the social role of authority in general. Filiality was identified with devotion to the absolute basis for humans and society that was symbolized by fatherhood. This thesis, analyzing ancient Chinese philosophy of filiality, presents a hypothesis concerning the essential structure of ancestor worship, which can be summarized as the symbolism representing higher levels of authority on the basis of parental authority.
Normal families of functions and groups of pseudoconformal diffeomorphisms of quaternion and octonion variables
Creators: name: Ludkovsky, S. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 58B25, 58D05

description: This paper is devoted to the specific class of pseudoconformal mappings of quaternion and octonion variables. Normal families of functions are defined and investigated. Four criteria of a family being normal are proven. Then groups of pseudoconformal diffeomorphisms of quaternion and octonion manifolds are investigated. It is proven, that they are finite dimensional Lie groups for compact manifolds. Their examples are given. Many charactersitic features are found in comparison with commutative geometry over $\bf R$ or $\bf C$.
description: 55 pages, 53 references
An approximation algorithm for counting contingency tables
Creators: name: Barvinok, Alexander
name: Luria, Zur
name: Samorodnitsky, Alex
name: Yong, Alexander
Publisher: name: arXiv
Year: 2008
Subjects: subject: Combinatorics (math.CO)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: We present a randomized approximation algorithm for counting contingency tables, mxn non-negative integer matrices with given row sums R=(r_1, ..., r_m) and column sums C=(c_1, ..., c_n). We define smooth margins (R,C) in terms of the typical table and prove that for such margins the algorithm has quasi-polynomial N^{O(ln N)} complexity, where N=r_1+...+r_m=c_1+...+c_n. Various classes of margins are smooth, e.g., when m=O(n), n=O(m) and the ratios between the largest and the smallest row sums as well as between the largest and the smallest column sums are strictly smaller than the golden ratio (1+sqrt{5})/2 = 1.618. The algorithm builds on Monte Carlo integration and sampling algorithms for log-concave densities, the matrix scaling algorithm, the permanent approximation algorithm, and an integral representation for the number of contingency tables.
description: 45 pages
Hypercubic Smeared Links for Dynamical Fermions
Creators: name: Hasenfratz, Anna
name: Hoffmann, Roland
name: Schaefer, Stefan
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We investigate a variant of hypercubic gauge link smearing where the SU(3) projection is replaced with a normalization to the corresponding unitary group. This smearing is differentiable and thus suitable for use in dynamical fermion simulations using molecular dynamics type algorithms. We show that this smearing is as efficient as projected hypercubic smearing in removing ultraviolet noise from the gauge fields. We test the normalized hypercubic smearing in dynamical improved (clover) Wilson and valence overlap simulations.
description: 18 pages, 4 figures, REVTeX4
Phase Reconstruction of a Cu(001) Seed Layer from $\textit{in situ}$ Polarized Neutron Reflectometry Data using Fe Reference Layers
Creators: name: Book, Alexander
name: Mayr, Sina
name: Stahn, Jochen
name: Böni, Peter
name: Kreuzpaintner, Wolfgang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The reconstruction of the complex reflection coefficient obtained by in situ Polarized Neutron Reflectometry is presented. Using the reference layer method, with a magnetic Fe layer, the phase information of the underlying Cu(001) seed layer sample structure is successfully retrieved and its scattering length density is calculated and compared with results obtained from traditional fitting. Two different reference layer approaches for retrieving the phase information are compared.
Ultra-cool dwarf in wide binaries from Gaia
Creators: name: Reylé, Céline
name: Sanchez Gimenez, Victor
name: Lagarde, Nadège
Publisher: name: Zenodo
Year: 2021
Subjects: Very low mass stars
Stellar systems, clusters, and associations

description: Ultra-cool dwarfs (UCDs) serve as a link between the lowest mass stars and the brown dwarfs. Gaia DR2 revealed thousands of ultra-cool dwarfs not identified as such before. In this work, we searched for companions to those in the Gaia catalogue, from their common proper motions and parallaxes. We found about 1,700 stars in multiple systems out of the original 16,500 sample. Among the companions, there are several tens of young stellar objects and white dwarfs, but also new UCD candidates. Such a sample can be used to better understand the binary properties of UCDs and to better characterize the physics of UCDs thanks to the easier characterization of higher mass companions.
description: {"references": ["Kirkpatrick, J. D., Henry, T. J., Irwin, M. J. 1997a, AJ, 113, 142", "Marocco, F. Smart, R. L., Mamajek, E. E., et al. 2020, MNRAS, 494, 4891", "Gaia Collaboration, Prusti, T., et al. 2016, A&A, 595, A", "Reyl\u00e9, C., 2018, A&A, 619L, 8", "Gaia Collaboration, Brown, A. G. A., et al. 2018, A&A, 616, A", "Smart, R. L., Marocco, F., Sarro, L. M., et al. 2019, MNRAS, 485, 4423", "Hartman, Z. D., L\u00e9pine, S. 2020, ApJS, 247, 66", "Wenger, M., Ochsenbein, F., Egret, D., et al. 2000, A&AS, 143, 9", "Winters, J. G., Henry, T. J., Jao, W.-C., et al. 2019, AJ, 157, 216", "Gaia Collaboration, Smart, R. L., et al. 2020,\u00a0arXiv:2012.02061", "El-Badry, K., Rix, H.-W., Heintz, T. M.,\u00a02021, MNRAS, tmp, 394", "Gaia Collaboration, Brown, A. G. A., et al. 2020\u00a0arXiv:2012.01533", "Law, R., Burgasser, A. J., Reyl\u00e9, C., et al. 2021, RNAAS, 5, 26L"]}
Classification of toric Fano 5-folds
Creators: name: Kreuzer, Maximilian
name: Nill, Benjamin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: High Energy Physics - Theory (hep-th)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 14M25, 14J45; 52B20

description: We obtain 866 isomorphism classes of five-dimensional nonsingular toric Fano varieties using a computer program and the database of four-dimensional reflexive polytopes. The algorithm is based on the existence of facets of Fano polytopes having small integral distance from any vertex.
description: AMS-LaTeX, 12 pages with 1 figure; minor corrections
Exploring persistent Doppler signals in rapidly-rotating M dwarfs
Creators: name: Robertson, Paul
Publisher: name: Zenodo
Year: 2021

description: The recent detection of a candidate exoplanet at the stellar rotation period of the young M dwarf AD Leo places a new emphasis on understanding the persistence and chromaticity of starspot signals for the lowest-mass stars. We have obtained highly precise multi-wavelength Doppler spectroscopy of four rapidly-rotating M dwarfs using the near-infrared Habitable-zone Planet Finder on McDonald Observatory's 10m Hobby-Eberly Telescope, and the optical HIRES spectrometer on the 10 Keck I Telescope. Our Doppler observations are complemented by photometry from Kepler, TESS, and the Las Cumbres Observatory (LCO) network of telescopes. For all four targets, we recover strong RV signals at the stellar rotation period. Some of these signals remain coherent for hundreds of stellar rotations, which bears important implications for detecting exoplanets around similar objects. We will discuss the persistence, chromaticity, and relation to photometry of each.
Diffuse x-rays: Directly Observing Dark Matter?
Creators: name: Forbes, Michael McNeil
name: Zhitnitsky, Ariel R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Several independent observations of the Galactic core suggest hitherto unexplained sources of energy. We suggest that dark matter in the form of dense antimatter nuggets could provide a natural site for electron and proton annihilation, providing 511 keV photons, gamma-rays, and diffuse keV x-ray radiation. We show that identifying dark matter as antimatter nuggets is consistent with the observed emissions, and we make definite predictions about their spectrum and morphology. If correct, our proposal not only identifies dark matter and explains baryogenesis, but allows x-ray observations to directly probe the matter distribution in our Galaxy.
description: Update corresponding to published version. Expanded appendices. (11 pages, REVTeX4)
Μέθοδοι μέτρησης της Αποδοτικότητας της Διαχείρισης της Εφοδιαστικής Αλυσίδας:
Creators: name: Νιζάμη, Φωτεινή Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Μέθοδοι μέτρησης της Αποδοτικότατης
Δείκτες μέτρησης της Αποδοτικότητας
Ποιοτική έρευνα
Methods of Measurement of Effectiveness
Indicators of the Measuring Effectiveness
Qualitative Research

description: Η μέτρηση της Αποδοτικότητας μίας επιχείρησης ως βασικό εργαλείο μάνατζμεντ, έχει αποτελέσει τις τελευταίες δεκαετίες αντικείμενο έντονου επιχειρηματικού και επιστημονικού ενδιαφέροντος. Η αρθογραφία που σχετίζεται με τη Μέτρηση της Αποδοτικότητας των επιχειρήσεων είναι πλούσια και συνεχώς αυξανόμενη. Αυτό οφείλεται στη ανάγκη των επιχειρήσεων να πρωταγωνιστήσουν σε ένα συνεχώς μεταβαλλόμενο και πλήρως ανταγωνιστικό περιβάλλον. Ιδιαίτερο ενδιαφέρον παρουσιάζει η στροφή των επιχειρήσεων από τη χρήση συστημάτων οικονομικής φύσεως για τη μέτρηση της Αποδοτικότητας στη χρήση ποσοτικών και μη ποσοτικών συστημάτων και αργότερα στη χρήση ισορροπημένων συστημάτων. Ο όρος ισορροπημένα αναφέρεται στη χρήση διαφορετικών μέτρων και μεταβλητών για τη μέτρηση της αποδοτικότητας προκειμένου να καταλήξουμε σε μια πιο ολοκληρωμένη εικόνα (Kaplan & Norton, 1992).Ο σκοπός της παρούσας διπλωματικής εργασίας είναι η βιβλιογραφική διερεύνηση των κυριότερων Μεθόδων Μέτρησης της Αποδοτικότητας και ο συνδυασμός ενός συνόλου Ποιοτικών Δεικτών προκειμένου να αναπτυχθεί ένα πλαίσιο μέτρησης της απόδοσης με το οποίο θα επιτευχθεί η μέτρηση της Αποδοτικότητας των εταιρειών "Λυκάκης ΙΜΕ Ε.Π.Ε" και "Σιδηρόπουλος Μεταφορική Α.Ε." που δραστηριοποιούνται στο χώρο των μεταφορών.
description: The measurement of the Effectiveness of an enterprise, as a basal management tool, has brought about an intense entrepreneurial and scientific interest over the last decades. Articles related to the Measurement of the Effectiveness of an enterprise, are rich and constantly growing. This is due to the need of businesses to play a leading role in a constantly changing and completely competitive environment. Of particular interest is the shift of businesses, from the use of the economic systems for Measurement of the Effectiveness, in the use of quantitative and qualitative systems and later on, in the use of balanced systems. The term in a balanced way, refers to the use of different measures and variables for the measuring of the efficiency, in order to have a complete view (Kaplan & Norton, 1992). The purpose of this thesis, is the bibliographic probe, of the main methods of measuring the effectiveness and the combination of a set of quality measures, in order to develop an effectiveness measurement framework, by which, it will be achieved the measurement of the efficiency of the companies “Lykakis IME LTD” and “Sidiropoulos Transport SA” that operate in the field of transport.
Form factor in K+ --> pi+ pi0 gamma: interference versus direct emission
Creators: name: Cappiello, Luigi
name: D'Ambrosio, Giancarlo
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze the effect of a form factor in the magnetic contribution to K+ --> pi+ pi0 gamma. We emphasize how this can show up experimentally: in particular we try to explore the difference between a possible interference contribution and a form factor in the magnetic part. The form factor used for K+ --> pi+ pi0 gamma is analogous to the one for KL --> pi+ pi- gamma, experimentally well established.
description: 9 pages revtex, 10 eps figures; improved presentation of theoretical and experimental status; refs. added
Anisotropic compact stars: Constraining model parameters to account for physical features of tidal Love numbers
Creators: name: Das, Shyam
name: Ray, Saibal
name: Khlopov, Maxim
name: Nandi, K. K.
name: Parida, Bikram Keshari
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper, we develop a new class of models for a compact star with anisotropic stresses inside the matter distribution. By assuming a linear equation of state for the anisotropic matter composition of the star we solve the Einstein field equations. In our approach, for the interior solutions we use a particular form of the ansatz for the metric function $g_{rr}$. The exterior solution is assumed as Schwarzschild metric and is joined with the interior metric obtained across the boundary of the star. These matching of the metrices along with the condition of the vanishing radial pressure at the boundary lead us to determine the model parameters. The physical acceptability of the solutions has verified by making use of the current estimated data available from the pulsar 4U1608-52. Thereafter, assuming anisotropy due to tidal effects we calculate the Love numbers from our model and compare the results with the observed compact stars, viz. KS 1731- 260,4U 1608- 52,4U 1724- 207,4U 1820- 30,SAX J1748.9-2021 and EXO 1745-268. The overall situation confirms physical viability of the proposed approach,which can shed new light on the interior of the compact relativistic objects.
description: Major Revision based on the referee reports; 31 pages; 11 figures
Ελληνικές πόλεις του δυτικού Ευξείνου Πόντου: Οι αναθηματικές επιγραφές:
Creators: name: Λιάππα, Μάγδα Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Εύξεινος Πόντος
αναθηματικές επιγραφές
Μαύρη θάλασσα
Dedicatory inscriptions
Pontus Euxinus
Black sea

description: Σκοπός της παρούσας διπλωματικής εργασίας ήταν η έρευνα, η συγκέντρωση και η καταγραφή των αρχαίων ελληνικών αναθηματικών επιγραφών που προέρχονται από τις ελληνικές πόλεις που ιδρύθηκαν επί της δυτικής ακτής του Ευξείνου Πόντου. Συνολικά παρουσιάζονται και μελετώνται οι αναθηματικές επιγραφές δέκα ελληνικών αποικιών οι οποίες ιδρύθηκαν στην εν λόγω περιοχή. Η δομή της μεταπτυχιακής εργασίας θα μπορούσε να συνοψιστεί ως εξής: Κατ’ αρχάς προηγείται πάντοτε το αρχαίο κείμενο της σωζόμενης αναθηματικής επιγραφής, ακολουθεί η νεοελληνική απόδοση αυτού, η εξέταση, ο σχολιασμός και η ανάλυση της μαρτυρούμενης θεότητας καθώς επίσης και του λατρευτικού επίθετου το οποίο ενδεχομένως επισυνάπτεται στο όνομα της τιμώμενης θεότητας. Της παραθέσεως της λατρείας που παραδίδεται κάθε φορά, έπεται η προσπάθεια ανίχνευσής της στην μητρόπολη και η ενδεχόμενη σύνδεσή της λατρείας στην εξεταζόμενη αποικία με την μητρόπολή της, όταν αυτό κρίνεται εφικτό, με απώτερο σκοπό να αποδειχθεί ότι οι λατρείας αυτές, στην συντριπτική τους πλειοψηφία, παραλήφθηκαν από την μητρόπολη και εν συνεχεία μεταφέρθηκαν και εξελίχθηκαν στην νέα αποικία.
description: The aim of the present master thesis was the research, the gathering and the recording of the ancient Greek dedicatory inscriptions which originate from the Greek poleis which founded in the west coast of the Euxine Pontus. Totally, the presentation and the study of the dedicatory inscriptions comes from ten Greek colonies which have been established in the studied region. Furthermore, the structure of this master thesis could be summarized as follows: Firstly, always precedes the ancient text of the extant dedicatory inscription, then follows the translation of the text in the modern Greek language, the examination, the commentary and finally the analysis of the testified deity as well as the examination of the epithet which possibly follows or precedes the name of the honored deity. After the presentation of the testified cult, follows the effort of the detection of this cult to the metropolis and the possible connection of the cult in the colony with the metropolis, when this is possible. The aim of this effort is to prove that these cults, in their majority, have been received from the metropolis, transferred and finally developed in the new colony.
Ανάπτυξη εφαρμογών για φορητές συσκευές. Εργαστηριακές ασκήσεις για την εκμάθηση του Android.
Creators: name: Κατσίμπας, Φραγκίσκος Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Φορητές συσκευές
Ανάπτυξη εφαρμογών
Εργαστηριακές ασκήσεις
Android
Application development
Mobile

description: Λαμβάνοντας υπόψιν την ραγδαία ανάπτυξη της τεχνολογίας και την ολοένα αυξανόμενη επέκταση της αγοράς φορητών συσκευών, είναι σημαντική η μελέτη του αντικτύπου της χρήσης tablets και κινητών για τον απλό χρήστη. Η ολοένα αυξανόμενη ζήτηση μηχανικών αυξάνει τις εκπαιδευτικές απαιτήσεις για παροχή στοχευμένης εκπαίδευσης ως προς τον τομέα των φορητών συσκευών, ένα μερίδιο της οποίας καταλαμβάνει η πλατφόρμα Android. Στόχος της παρούσας εργασίας είναι ο σχεδιασμός και δημιουργία εκπαιδευτικού υλικού με στόχο την εκμάθηση της πλατφόρμας Android. Η εργασία απευθύνεται σε άτομα με λίγες γνώσεις προγραμματισμού και στόχο έχει να δώσει τις βασικές κατευθύνσεις στα άτομα που θέλουν να ασχοληθούν με την πλατφόρμα.
description: Taking into consideration the great technological evolution and the constant increase in mobile device marketshare, it is important to observe and research on the impact of the use of tablets and smartphones. In addition to this, the big demand for software engineers creates an even bigger demand for educational courses on the learning of mobile development, a part of which is teaching of Android. The main objective of this thesis is to design and create educational content for the teaching of Android. This thesis is targeted towards students with basic programming knowledge and intends to teach the basis of Android development.
description: Σε συνεργασία με το τμήμα Λογιστικής και Χρηματοοικονομικής (Πανεπιστήμιο Μακεδονίας)
Small-scale dynamo in an F-star: effects on near-surface stratification, convection and intensity
Creators: name: Bhatia, Tanayveer
name: Cameron, Robert
name: Solanki, Sami
name: Peter, Hardi
name: Przybylski, Damien
name: Witzke, Veronika
name: Shapiro, Alexander
Publisher: name: Zenodo
Year: 2021
Subjects: Cool Stars on the main sequence
Small-scale dynamo
Simulation
Near-surface convection

description: The emission from the photosphere of stars shows a systematic center-to-limb variation. In cool main-sequence stars, the near-surface convection has an impact on this variation, with implications for lightcurves of stars during planetary transits. In the Sun, there is strong evidence for a small-scale dynamo (SSD) maintaining the small-scale magnetic flux. We aim to investigate what additional effects such a field would play for other cool main-sequence stars. In our work we first concentrate on F-stars. This is because they have sonic velocities near the surface, implying a rough equipartition between internal and kinetic energies. In addition, an SSD might create a significant magnetic energy density to impact the results. We investigate the interplay between internal, kinetic and magnetic energies in 3D cartesian box MHD models of a F3V-star in the near-surface convection, using the MURaM radiative-MHD simulation code. Along with a reference hydrodynamic run, two MHD models with self-consistently generated magnetic fields with two different lower boundary conditions are considered. We find that the SSD process creates a magnetic field with energy within an order of magnitude of the internal and the kinetic energy. Compared to the hydrodynamic run, we find slight (~1-3%) but significant deviations in density, gas pressure and temperature stratification. At the surface, this corresponds to a temperature difference of ~130 K. As expected, there is a significant reduction in kinetic energy flux once the SSD is operational. The changes in intensity are more subtle, both in total intensity and granulation pattern. From this we conclude that the presence of an SSD will have a significant impact on the atmospheric structure and intensity characteristics seen at the surface. This makes it clear that it would be important to consider the spatially and temporally averaged effects of the SSD also for global stellar models.
The flavor-changing single-top quark production in the littlest Higgs model with T parity at the LHC
Creators: name: Wang, Xuelei
name: Zhang, Yanju
name: Jin, Huiling
name: Xi, Yanhui
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The littlest Higgs model with discrete symmetry named "T-parity"(LHT) is an interesting new physics model which does not suffer strong constraints from electroweak precision data. One of the important features of the LHT model is the existence of new source of FC interactions between the SM fermions and the mirror fermions. These FC interactions can make significant loop-level contributions to the couplings $tcV$, and furthermore enhance the cross sections of the FC single-top quark production processes. In this paper, we study some FC single-top quark production processes, $pp\to t\bar{c}$ and $pp\to tV$, at the LHC in the LHT model. We find that the cross sections of these processes are strongly depended on the mirror quark masses. The processes $pp\to t\bar{c}$ and $pp\to tg$ have large cross sections with heavy mirror quarks. The observation of these FC processes at the LHC is certainly the clue of new physics, and further precise measurements of the cross scetions can provide useful information about the free parameters in the LHT model, specially about the mirror quark masses.
description: 20 pages, 5 figures
A consistent and conservative Phase-Field model for thermo-gas-liquid-solid flows including liquid-solid phase change
Creators: name: Huang, Ziyang
name: Lin, Guang
name: Ardekani, Arezoo M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Numerical Analysis (math.NA)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In the present study, a consistent and conservative Phase-Field model is developed to study thermo-gas-liquid-solid flows with liquid-solid phase change. The proposed model is derived with the help of the consistency conditions and exactly reduces to the consistent and conservative Phase-Field method for incompressible two-phase flows, the fictitious domain Brinkman penalization (FD/BP) method for fluid-structure interactions, and the Phase-Field model of solidification of pure material. It honors the mass conservation, defines the volume fractions of individual phases unambiguously, and therefore captures the volume change due to phase change. The momentum is conserved when the solid phase is absent, but it changes when the solid phase appears due to the no-slip condition at the solid boundary. The proposed model also conserves the energy, preserves the temperature equilibrium, and is Galilean invariant. A novel continuous surface tension force to confine its contribution at the gas-liquid interface and a drag force modified from the Carman-Kozeny equation to reduce solid velocity to zero are proposed. The issue of initiating phase change in the original Phase-Field model of solidification is addressed by physically modifying the interpolation function. The corresponding consistent scheme is developed to solve the model, and the numerical results agree well with the analytical solutions and the existing experimental and numerical data. Two challenging problems having a wide range of material properties and complex dynamics are conducted to demonstrate the capability of the proposed model.
description: This is an accepted manuscript
Helical Magnetorotational Instability in Magnetized Taylor-Couette Flow
Creators: name: Liu, Wei
name: Goodman, Jeremy
name: Herron, Isom
name: Ji, Hantao
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Hollerbach and Rudiger have reported a new type of magnetorotational instability (MRI) in magnetized Taylor-Couette flow in the presence of combined axial and azimuthal magnetic fields. The salient advantage of this "helical'' MRI (HMRI) is that marginal instability occurs at arbitrarily low magnetic Reynolds and Lundquist numbers, suggesting that HMRI might be easier to realize than standard MRI (axial field only). We confirm their results, calculate HMRI growth rates, and show that in the resistive limit, HMRI is a weakly destabilized inertial oscillation propagating in a unique direction along the axis. But we report other features of HMRI that make it less attractive for experiments and for resistive astrophysical disks. Growth rates are small and require large axial currents. More fundamentally, instability of highly resistive flow is peculiar to infinitely long or periodic cylinders: finite cylinders with insulating endcaps are shown to be stable in this limit. Also, keplerian rotation profiles are stable in the resistive limit regardless of axial boundary conditions. Nevertheless, the addition of toroidal field lowers thresholds for instability even in finite cylinders.
description: 16 pages, 2 figures, 1 table, submitted to PRE
Διερεύνηση συνθέσεων πιροξικάμης/xιτοζάνης με τη βοήθεια πειραματικού σχεδιασμού μείγματος για την παρασκευή μικροσφαιρών διαφορετικού ρυθμού αποδέσμευσης και βέλτιστης σφαιρικότητας:
Creators: name: Γκόγκου, Παρασκευή Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Μικροσφαίρες
Χιτοζάνης
Πιροξικάμη
Pellets
Chitosan
Piroxicam

description: Ένα από τα μειονεκτήματα της μικροκρυσταλλικής κυτταρίνης (MCC) ως έκδοχο μικροσφαιρών είναι η βραδεία και ατελής αποδέσμευση δυσδιάλυτων φαρμάκων. Για την αντιμετώπιση του προβλήματος, μέρος της MCC μπορεί να αντικατασταθεί με υδρόφιλα συνθετικά ή φυσικά πολυμερή που διευκολύνουν τη διείσδυση του μέσου διάλυσης και προκαλούν διόγκωση. Ένα υδρόφιλο φυσικό πολυμερές παρόμοιας δομής με την κυτταρίνη είναι η χιτοζάνη η οποία επιπλέον έχει τα πλεονεκτήματα ότι αυξάνει τη διαλυτότητα και το ρυθμό διάλυσης είτε λόγω βελτίωσης της διαβρεκτικότητας είτε λόγω συμπλοκοποίησης, είναι βιοδιασπώμενο, βιοσυμβατό, έχει βιοπροσκολλητικές ιδιότητες και μηδενική τοξικότητα. Σκοπός της παρούσας εργασίας ήταν η βελτιστοποίηση συνθέσεων μικροσφαιρών του δυσδιάλυτου φαρμάκου πιροξικάμη με το υδρόφιλο πολυμερές χιτοζάνη και με MCC, με εφαρμογή πειραματικού σχεδιασμού μείγματος, ακολουθούμενου από αριθμητική και γραφική βελτιστοποίηση των ποιοτικών χαρακτηριστικών (σφαιρικότητα και μέγεθος) και του ρυθμού διάλυσης.
description: One of the drawbacks of microcrystalline cellulose (MCC) microspheres is slow and incomplete release of poorly soluble drugs. To overcome this problem, part of the MCC may be replaced with hydrophilic polymers, natural or synthetic, which facilitate the penetration of the dissolution medium into the microsphere and cause swelling. A hydrophilic polymer of similar structure to cellulose is chitosan which has the advantage of increasing the solubility and dissolution rate, either due to improved wettability or due to forming complexes. Additionally chitosan is biodegradable, biocompatible, has bioadhesive properties and no toxicity. The purpose of this study was to optimize formulations of microspheres containing the poorly soluble drug piroxicam, the hydrophilic polymer chitosan and MCC, by applying experimental mixture design techniques, followed by numerical and graphical optimization of the quality characteristics (sphericity and size) and the dissolution rate.
Hierarchy of clumps fragments : a den for the formation of local star-clusters using a graph theory-based approach
Creators: name: Thomasson, Benjamin
name: Joncour, Isabelle
name: Moraux, Estelle
Publisher: name: Zenodo
Year: 2021
Subjects: Stellar systems, clusters, and associations

description: The spatial distribution of YSOs might give some clues on the fragmentation process of molecular clouds. Indeed, the small significant stellar structures (NESTs) discovered in Taurus (Joncour+18) are interpreted as pristine imprints of star formation process and may be a consequence of the fragmentation of gaseous substructures. This work aims to investigate at which spatial scale gas clumps are fragmenting to form NESTs. We design a graph theory-based approach to characterise the properties of fragmentation and apply it to Herschel observations of NGC2264. Using the getsf procedure (Men’shchikov+21), we extracted clumps catalogs at various scales in both observations and simulations. The observational data sets are taken from the Herschel’s five bands density maps of NGC2264, covering scales from ~6kAU to ~26kAU. From those catalogs we build a directed graph in which the nodes are associated to the individual clumps and the links between them define an inclusive relation between ravelled clumps. Spatial distribution of structures in NGC2264 revealed that hierarchical nested fragmentation is primary observed in the high density central part of NGC2264 whereas monolothic collapse occurs in the sparser regions. Star formation may result from hierarchical fractal collapse of massive dense cores.
A complete 12CO 2-1 map of M51 with HERA: I. Radial averages of CO, HI, and radio continuum
Creators: name: Schuster, K. F.
name: Kramer, C.
name: Hitschfeld, M.
name: Garcia-Burillo, S.
name: Mookerjea, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The mechanisms governing the star formation rate in spiral galaxies are not yet clear. The nearby, almost face-on, and interacting galaxy M51 offers an excellent opportunity to study at high spatial resolutions the local star formation laws. In this first paper, we investigate the correlation of H2, HI, and total gas surface densities with the star forming activity, derived from the radio continuum (RC), along radial averages out to radii of 12kpc. We have created a complete map of M51 in 12CO 2-1 at a resolution of 450kpc using HERA at the IRAM-30m telescope. These data are combined with maps of HI and the radio-continuum at 20cm wavelength. The latter is used to estimate the star formation rate (SFR), thus allowing to study the star formation efficiency and the local Schmidt law. The velocity dispersion from CO is used to study the critical surface density and the gravitational stability of the disk. The critical gas velocity dispersions needed to stabilize the gas against gravitational collapse in the differentially rotating disk of M51 using the Toomre criterion, vary with radius between 1.7 and 6.8 km/s. Observed radially averaged dispersions derived from the CO data vary between 28 km/s in the center and 8 km/s at radii of 7 to 9 kpc. They exceed the critical dispersions by factors Q_gas of 1 to 5. We speculate that the gravitational potential of stars leads to a critically stable disk.
description: accepted by A&A
Channel Estimation and Data Detection Analysis of Massive MIMO with 1-Bit ADCs
Creators: name: Atzeni, Italo
name: Tölli, Antti
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We present an analytical framework for the channel estimation and the data detection in massive multiple-input multiple-output uplink systems with 1-bit analog-to-digital converters (ADCs) and i.i.d. Rayleigh fading. First, we provide closed-form expressions of the mean squared error (MSE) of the channel estimation considering the state-of-the-art linear minimum MSE estimator and the class of scaled least-squares estimators. For the data detection, we provide closed-form expressions of the expected value and the variance of the estimated symbols when maximum ratio combining is adopted, which can be exploited to efficiently implement minimum distance detection and, potentially, to design the set of transmit symbols. Our analytical findings explicitly depend on key system parameters such as the signal-to-noise ratio (SNR), the number of user equipments, and the pilot length, thus enabling a precise characterization of the performance of the channel estimation and the data detection with 1-bit ADCs. The proposed analysis highlights a fundamental SNR trade-off, according to which operating at the right noise level significantly enhances the system performance.
description: IEEE Transactions on Wireless Communications
Noise figure and photon probability distribution in Coherent Anti-Stokes Raman Scattering (CARS)
Creators: name: Dimitropoulos, D.
name: Solli, D. R.
name: Claps, R.
name: Jalali, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The noise figure and photon probability distribution are calculated for coherent anti-Stokes Raman scattering (CARS) where an anti-Stokes signal is converted to Stokes. We find that the minimum noise figure is ~ 3dB.
description: 2 pages
MAGNA++: Maximizing Accuracy in Global Network Alignment via both node and edge conservation
Creators: name: Vipin Vijayan
name: Saraph, Vikram
name: Milenkovic, Tijana
Publisher: name: F1000Research
Year: 2015

description: Biological network alignment aims to identify similar regions between networks of different species. Hence, it can be used for across-species transfer of biological knowledge. Existing methods aim to find high-scoring alignments with respect to overall node similarity (or node conservation). But, the accuracy of the alignments is then evaluated using some other measure, such as the amount of conserved edges. Thus, the existing methods align similar nodes between networks hoping to conserve many edges, but only after the alignment is constructed. Instead, we introduce MAGNA to directly optimize edge conservation while the alignment is constructed, without decreasing the quality of node mapping. In systematic evaluations against state-of-the-art methods (IsoRank, MI-GRAAL and GHOST), on both synthetic and real-world biological networks, MAGNA outperforms all of the existing methods, in terms of both node and edge conservation as well as both topological and biological alignment accuracy. Our more recent MAGNA++ framework further improves alignment quality by: 1) simultaneously maximizing any one of three different measures of edge conservation (including our recent superior S3 measure) and any desired measure of node conservation, which yields better alignments compared to maximizing only node conservation (as existing methods do) or only edge conservation (as MAGNA does), 2) speeding up the original MAGNA algorithm by parallelizing it to automatically use all available resources, as well as by re-implementing the edge conservation measures more efficiently, 3) providing a friendly GUI for easy use by domain (e.g., biological) scientists, and 4) offering source code for easy extensibility by computational scientists.