cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Analogues of Entropy in Bi-Free Probability Theory: Microstates
Creators: name: Charlesworth, Ian
name: Skoufranis, Paul
Publisher: name: arXiv
Year: 2019
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46L54, 46L53, 47B80, 94A17

description: In this paper, we extend the notion of microstate free entropy to the bi-free setting. In particular, using the bi-free analogue of random matrices, microstate bi-free entropy is defined. Properties essential to an entropy theory are developed, such as the behaviour of the entropy when transformations on the left variables or on the right variables are performed. In addition, the microstate bi-free entropy is demonstrated to be additive over bi-free collections provided additional regularity assumptions are included and is computed for all bi-free central limit distributions. Moreover, an orbital version of bi-free entropy is examined which provides a tighter upper bound for the subadditivity of microstate bi-free entropy and provides an alternate characterization of bi-freeness in certain settings.
description: (new version contains corrections, orbital bi-free entropy, and a new characterization of bi-freenness)
All fundamental electrically charged thin shells in general relativity: From star shells to tension shell black holes and regular black holes and beyond
Creators: name: Lemos, José P. S.
name: Luz, Paulo
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We classify all fundamental electrically charged thin shells in general relativity, i.e., static spherically symmetric perfect fluid thin shells with a Minkowski spacetime interior and a Reissner-Nordström spacetime exterior, characterized by the spacetime mass and electric charge. The fundamental shell can exist in three states, nonextremal, extremal, and overcharged. The nonextremal state allows the shell to be located such that its radius can be outside its own gravitational radius, or can be inside its own Cauchy radius. The extremal state allows the shell to be located such that its radius can be outside its own gravitational radius, or can be inside it. The overcharged state allows the shell to be located anywhere. There is a further division, one has to specify the orientation of the shell, i.e., whether the normal out of the shell points toward increasing or decreasing radii. There is still a subdivision in the extremal state when the shell is at the gravitational radius, in that the shell can approach it from above or from below. The shell is assumed to be composed of an electrically charged perfect fluid, and the energy conditions are tested. Carter-Penrose diagrams are drawn for the shell spacetimes. There are fourteen cases in the classification of the fundamental shells, namely, nonextremal star shells, nonextremal tension shell black holes, nonextremal tension shell regular and nonregular black holes, nonextremal compact shell naked singularities, Majumdar-Papapetrou star shells, extremal tension shell singularities, extremal tension shell regular and nonregular black holes, Majumdar-Papapetrou compact shell naked singularities, Majumdar-Papapetrou shell quasiblack holes, extremal null shell quasinonblack holes, extremal null shell singularities, Majumdar-Papapetrou null shell singularities, overcharged star shells, and overcharged compact shell naked singularities.
description: 56 pages including 31 figures, plus 2 appendices including 2 figures, plus references; all together 67 pages and 33 figures
Taking control : power and contradiction in First Nations adult education
Creators: name: Haig-Brown, Celia
Publisher: name: University of British Columbia
Year: 2011

description: This dissertation is an ethnography. It explores the ways that people within a First Nations adult education centre make sense of taking control of education. Michel Foucault's open-textured analysis of power frames the research. He argues power not only represses but also "forms knowledge and produces discourse." Control and power as used by the "new" sociologists of education, and the National Indian Brotherhood in its policy statement Indian Control of Indian Education further locate the study. Extensive use of the participants' words allows a consideration of meanings inscribed in discourse. The study is based on a year of fieldwork including interviews, observations and the researcher's direct participation as a teacher in the centre. It places expressions of people's understandings of control within a series of contextualizations. The centre exists in contemporary Canadian society. Documentary evidence of British Columbia's First Nations efforts to control formal education and re-presentation of the centre's twenty years of growth and development illuminate an historical context. The study examines the current significance of the building where students find "a safe place to learn." Biographies, furnishing additional context for people's words, situate the study in relation to life history. Their engagement in a variety of the centre's programs provides the immediate context. Students and teachers explore what it is to be First Nations people seeking knowledge which will enable them to make choices about employment and education in First Nations or mainstream locations. References to the document Indian Control of Indian Education reveal its continuing significance for those people who are taking control. Study participants identify as crucial many of the issues raised within the document such as Native values, curriculum, First Nations and non-Native teachers, jurisdiction and facilities. At the same time, their discourse reveals the complex process of refining the original statements as policy translates to practice and people ponder the implications. A final chapter, something of an epilogue, argues that the dialectical contradiction is a useful analytical tool for examining the dissonances which arise in attempts to meet First Nations needs and desires within a predominantly non-Native society.
Anomalous Dynamics of Unbiased Polymer Translocation through a Narrow Pore
Creators: name: Panja, Debabrata
name: Barkema, Gerard T.
name: Ball, Robin C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We consider a polymer of length $N$ translocating through a narrow pore in the absence of external fields. Characterization of its purportedly anomalous dynamics has so far remained incomplete. We show that the polymer dynamics is anomalous until the Rouse time $τ_{R}\sim N^{1+2ν}$, with a mean square displacement through the pore consistent with $t^{(1+ν)/(1+2ν)}$, with $ν\approx0.588$ the Flory exponent. This is shown to be directly related to a decay in time of the excess monomer density near the pore as $t^{-(1+ν)/(1+2ν)}\exp(-t/τ_{R})$. Beyond the Rouse time translocation becomes diffusive. In consequence of this, the dwell-time $τ_{d}$, the time a translocating polymer typically spends within the pore, scales as $N^{2+ν}$, in contrast to previous claims.
description: 12 pages, 3 figures; to appear in J. Phys.: Cond. Mat. (Fast Track Communication)
Trends in Spitzer Secondary Eclipses
Creators: name: Wallack, Nicole L.
name: Knutson, Heather A.
name: Deming, Drake
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: It is well-established that the magnitude of the incident stellar flux is the single most important factor in determining the day-night temperature gradients and atmospheric chemistries of short-period gas giant planets. However it is likely that other factors, such as planet-to-planet variations in atmospheric metallicity, C/O ratio, and cloud properties, also contribute to the observed diversity of infrared spectra for this population of planets. In this study we present new 3.6 and 4.5 micron secondary eclipse measurements for five transiting gas giant planets: HAT-P-5b, HAT-P-38b, WASP-7b, WASP-72b, and WASP-127b. We detect eclipses in at least one bandpass for all five planets and confirm circular orbits for all planets except for WASP-7b, which shows evidence for a non-zero eccentricity. Building on the work of Garhart et al. (2020), we place these new planets into a broader context by comparing them with the sample of all planets with measured Spitzer secondary eclipses. We find that incident flux is the single most important factor for determining the atmospheric chemistry and circulation patterns of short-period gas giant planets. Although we might also expect surface gravity and host star metallicity to play a secondary role, we find no evidence for correlations with either of these two variables.
description: 17 pages, 8 figures, accepted for publication in AJ
Dispersion Formulas in QFTs, CFTs, and Holography
Creators: name: Meltzer, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study momentum space dispersion formulas in general QFTs and their applications for CFT correlation functions. We show, using two independent methods, that QFT dispersion formulas can be written in terms of causal commutators. The first derivation uses analyticity properties of retarded correlators in momentum space. The second derivation uses the largest time equation and the defining properties of the time-ordered product. At four points we show that the momentum space QFT dispersion formula depends on the same causal double-commutators as the CFT dispersion formula. At $n$-points, the QFT dispersion formula depends on a sum of nested advanced commutators. For CFT four-point functions, we show that the momentum space dispersion formula is equivalent to the CFT dispersion formula, up to possible semi-local terms. We also show that the Polyakov-Regge expansions associated to the momentum space and CFT dispersion formulas are related by a Fourier transform. In the process, we prove that the momentum space conformal blocks of the causal double-commutator are equal to cut Witten diagrams. Finally, by combining the momentum space dispersion formulas with the AdS Cutkosky rules, we find a complete, bulk unitarity method for AdS/CFT correlators in momentum space.
description: 63 pages plus appendices, 3 figures
Data Augmentation for Bayesian Deep Learning
Creators: name: Wang, Yuexi
name: Polson, Nicholas G.
name: Sokolov, Vadim O.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Deep Learning (DL) methods have emerged as one of the most powerful tools for functional approximation and prediction. While the representation properties of DL have been well studied, uncertainty quantification remains challenging and largely unexplored. Data augmentation techniques are a natural approach to provide uncertainty quantification and to incorporate stochastic Monte Carlo search into stochastic gradient descent (SGD) methods. The purpose of our paper is to show that training DL architectures with data augmentation leads to efficiency gains. We use the theory of scale mixtures of normals to derive data augmentation strategies for deep learning. This allows variants of the expectation-maximization and MCMC algorithms to be brought to bear on these high dimensional nonlinear deep learning models. To demonstrate our methodology, we develop data augmentation algorithms for a variety of commonly used activation functions: logit, ReLU, leaky ReLU and SVM. Our methodology is compared to traditional stochastic gradient descent with back-propagation. Our optimization procedure leads to a version of iteratively re-weighted least squares and can be implemented at scale with accelerated linear algebra methods providing substantial improvement in speed. We illustrate our methodology on a number of standard datasets. Finally, we conclude with directions for future research.
Conformal Invariance of Iso-height Lines in two-dimensional KPZ Surface
Creators: name: Saberi, A. A.
name: Niry, M. D.
name: Fazeli, S. M.
name: Tabar, M. R. Rahimi
name: Rouhani, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The statistics of the iso-height lines in (2+1)-dimensional Kardar-Parisi-Zhang (KPZ) model is shown to be conformal invariant and equivalent to those of self-avoiding random walks. This leads to a rich variety of new exact analytical results for the KPZ dynamics. We present direct evidence that the iso-height lines can be described by the family of conformal invariant curves called Schramm-Loewner evolution (or $SLE_κ$) with diffusivity $κ=8/3$. It is shown that the absence of the non-linear term in the KPZ equation will change the diffusivity $κ$ from 8/3 to 4, indicating that the iso-height lines of the Edwards-Wilkinson (EW) surface are also conformally invariant, and belong to the universality class of the domain walls in the O(2) spin model.
description: 4 pages, 6 figures
Characterizing the abundance, properties, and kinematics of the cool circumgalactic medium of galaxies in absorption with SDSS DR16
Creators: name: Anand, Abhijeet
name: Nelson, Dylan
name: Kauffmann, Guinevere
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In order to study the circumgalactic medium (CGM) of galaxies we develop an automated pipeline to estimate the optical continuum of quasars and detect intervening metal absorption line systems with a matched kernel convolution technique and adaptive S/N criteria. We process $\sim$ one million quasars in the latest Data Release 16 (DR16) of the Sloan Digital Sky Survey (SDSS) and compile a large sample of $\sim$ 160,000 MgII absorbers, together with $\sim$ 70,000 FeII systems, in the redshift range $0.35
description: 23 pages, 20 Figures, 3 Appendices, MNRAS accepted. The MgII absorber catalogue is publicly available at https://wwwmpa.mpa-garching.mpg.de/SDSS/MgII/
MoLUSC: A MOck Local Universe Survey Constructor
Creators: name: Sousbie, T.
name: Courtois, H.
name: Bryan, G.
name: Devriendt, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: This paper presents MoLUSC, a new method for generating mock galaxy catalogs from a large scale ($\approx 1000^3$ Mpc$^3$) dark matter simulation, that requires only modest CPU time and memory allocation. The method uses a small-scale ($\approx 256^3$ Mpc$^3$) dark matter simulation on which the \galics semi-analytic code has been run in order to define the transformation from dark matter density to galaxy density transformation using a probabilistic treatment. MoLUSC is then applied to a large-scale dark matter simulation in order to produce a realistic distribution of galaxies and their associated spectra. This permits the fast generation of large-scale mock surveys using relatively low-resolution simulations. We describe various tests which have been conducted to validate the method, and demonstrate a first application to generate a mock Sloan Digital Sky Survey redshift survey.
description: submitted to ApJ
Viscosity of High Energy Nuclear Fluids
Creators: name: Parihar, V.
name: Widom, A.
name: Drosdoff, D.
name: Srivastava, Y. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Relativistic high energy heavy ion collision cross sections have been interpreted in terms of almost ideal liquid droplets of nuclear matter. The experimental low viscosity of these nuclear fluids have been of considerable recent quantum chromodynamic interest. The viscosity is here discussed in terms of the string fragmentation models wherein the temperature dependence of the nuclear fluid viscosity obeys the Vogel-Fulcher-Tammann law.
description: 6 pages, ReVTeX 4 format, two figures, *.eps format
Επιδημιολογική διερεύνηση των αναγκών για φροντίδα υγείας των ηλικιωμένων που ζουν στην κοινότητα
Creators: name: Γιαννακόπουλος, Ευστάθιος Εμ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2006
Subjects: Επιδημιολογία
Νοσηρότητα
Epidemiology
Morbidity

description: Εισαγωγή : Η δημογραφική γήρανση του πληθυσμού και η έκπτωση των μηχανισμών προσαρμογής καθιστούν τους ηλικιωμένους μια μεγάλη πληθυσμιακή ομάδα με ιδιαίτερες ανάγκες υγείας. Η λειτουργική αυτονομία και η ποιότητα ζωής είναι απαραίτητες για την επίτευξη ενός ικανοποιητικού επίπεδου υγείας. Στόχος : ο σχεδιασμός και η εφαρμογή της επιδημιολογικής διερεύνησης των αναγκών των ηλικιωμένων σε μια αστική κοινότητα. Μέθοδος : πληθυσμιακή μελέτη χρονικής στιγμής στον πληθυσμό των ατόμων ηλικίας 65 ετών και άνω που κατοικούν στην Τριανδρία Θεσσαλονίκης με τη χρήση σταθμισμένων ερωτηματολογίων. Αποτελέσματα : η μελέτη περιέλαβε δεδομένα 635 ατόμων. Οι παράμετροι που επηρεάζουν αρνητικά την ποιότητα της υγείας είναι : η ισχαιμική καρδιοπάθεια, η οσφυαλγία, μυοσκελετικά συμπτώματα, η ανικανότητα προσφοράς βοήθειας, ο αριθμός των αναφερόμενων προβλημάτων υγείας και των λαμβανόμενων φαρμάκων, η άνοια και η κατάθλιψη, ενώ η αύξηση της ηλικίας επηρεάζει θετικά. Συμπεράσματα : παρατηρείται υψηλός επιπολασμός των χρόνιων νοσημάτων και μεγάλη συννοσηρότητα. Τα προβλήματα που επιδεινώνουν την αυτονομία και την κινητικότητα επηρεάζουν σε μεγαλύτερο βαθμό την ποιότητα ζωής των ηλικιωμένων
description: Introduction : the demographic aging of the population and the adoptive mechanisms make elderly a major population group with special health needs. Functional autonomy and quality of life are necessary for the achievement of a sufficient quality of health. Aim : the structure and implementation of epidemiological assessment of the needs if the elderly in an urban population. Method : a population-based cross-sectional study of the inhabitants of Triandria, Thessaloniki, using structured questionnaires. Results : 635 elderly were included in the study. Parameters having a negative effect on health quality were : coronary heart disease, low back pain, musculoskeletal symptoms, inability to offer help, number of reported problems and of prescriptions used, dementia and depression, while age has a positive effect. Conclusions : a high prevalence chronic diseases and increased commorbidity was observed. Health problems that deteriorate autonomy and mobility have a greater impact on the quality of life of the elderly
Εργαλεία γραφικής-οπτικής αναπαράστασης πληροφοριών στη διδακτική της φυσικής: εννοιoλογικοί χάρτες, V-χάρτες, διαγράμματα Venn
Creators: name: Μπελιώκας, Αδάμος Φ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2006
Subjects: Γραφική αναπαράσταση πληροφορίας
Διδακτική φυσικής
Graphic representation of information
Didactics of physics

description: Στην παρούσα μελέτη γίνεται μια προσπάθεια καταγραφής και ταξινόμησης της έννοιας "γραφική αναπαράσταση πληροφορίας" όπως προκύπτει από τη βιβλιογραφία. Αναφέρονται αναλυτικά τα χαρακτηριστικά και οι χρήσεις στη διδακτική της φυσικής, των εννοιολογικών χαρτών και των V-διαγραμμάτων. Μορφοποιείται επίσης η πρόταση του γράφοντος για τη χρήση των διαγραμμάτων Venn, στο ίδιο πλαίσιο(θεωρίας εκπαίδευσης και γνωστικής ψυζολογίας). Στη μελέτη περιέχονται εφαρμογές των εργαλείων γραφικής αναπαράστασης πληροφοριών στη διδακτική της φυσικής. Επίσης ερευνώνται η απαοτελεσματικότητα και η αποδοχή αυτών των εργαλείων από την εκπαιδευτική κοινότητα
description: In the present study of an effort is made to record and classify the concept-term "graphical representation of information" as it results from the bibliography. The characteristics and the uses of the concept maps and V-diagrams, in the didactics of physics, are analytically reported. The proposal of the writer for the use of Venn diagrams, in the same frame(of theory of education cognitive psychology) is shaped also. Applications of certain uses, of tools of graphic representation of information in the didactics of physics, are included in the study. The effectiveness of these tools and their acceptance of the educational community are also investigated
Dissipative generalized Chaplygin gas as phantom dark energy
Creators: name: Cruz, Norman
name: Lepe, Samuel
name: Pena, Francisco
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The generalized Chaplygin gas, characterized by the equation of state $p=-\mathcal{A}/ρ^α$, has been considered as a model for dark energy due its dark-energy-like evolution at late times. When dissipative processes are taken account, within the framework of the standard Eckart theory of relativistic irreversible thermodynamics, cosmological analytical solutions are found. Using the truncated causal version of the Israel-Stewart formalism, a suitable model was constructed which cross the $w=-1$ barrier. The future-singularities encounter in both approaches are of a new type, not included in the classification presented by S. Nojiri, S. D. Odintsov and S. Tsujikawa, Phys. Rev. D71, 063004 (2005).
description: 8 pages
Calibration of residual aberrations in exoplanet imagers with large numbers of degrees of freedom
Creators: name: Pourcelot, Raphaël
name: Vigan, Arthur
name: Dohlen, Kjetil
name: Rouzé, Bastien
name: Sauvage, Jean-François
name: Morsy, Mona El
name: Lopez, Maxime
name: N'Diaye, Mamadou
name: Caillat, Amandine
name: Choquet, Élodie
name: Otten, Gilles P. P. L.
name: Abbinanti, Alain
name: Balard, Philippe
name: Carbillet, Marcel
name: Blanchard, Philippe
name: Hulin, Jérémy
name: Robert, Émilie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Imaging faint objects, such as exoplanets or disks, around nearby stars is extremely challenging because host star images are dominated by the telescope diffraction pattern. Using a coronagraph is an efficient solution for removing diffraction but requires an incoming wavefront with good quality to maximize starlight rejection. On the ground, the most advanced exoplanet imagers use extreme adaptive optics (ExAO) systems that are based on a deformable mirror (DM) with a large number of actuators to efficiently compensate for high-order aberrations and provide diffraction-limited images. While several exoplanet imagers with DMs using around 1500 actuators are now routinely operating on large telescopes to observe gas giant planets, future systems may require a tenfold increase in the number of degrees of freedom to look for rocky planets. In this paper, we explore wavefront correction with a secondary adaptive optics system that controls a very large number of degrees of freedom that are not corrected by the primary ExAO system. Using Marseille Imaging Testbed for High Contrast (MITHiC), we implement a second stage of adaptive optics with ZELDA, a Zernike wavefront sensor, and a spatial light modulator (SLM) to compensate for the phase aberrations of the bench downstream residual aberrations from adaptive optics. We demonstrate that their correction up to 137 cycles per pupil with nanometric accuracy is possible, provided there is a simple distortion calibration of the pupil and a moderate wavefront low-pass filtering. We also use ZELDA for a fast compensation of ExAO residuals, showing its promising implementation as a second-stage correction for the observation of rocky planets around nearby stars. Finally, we present images with a classical Lyot coronagraph on MITHiC and validate our ability to reach its theoretical performance with our calibration.
LSA-DK and manual
Creators: name: Pedersen, Mette Merete
name: Bodilsen, Ann Christine
name: Kjær-Sørensen, Pia
name: Brown, Cynthia J
name: Klausen, Julie Midtgaard
Publisher: name: Zenodo
Year: 2019
Subjects: Life Space Assessment
LSA-DK

description: The Danish version of the UAB Life Space Assessment and manual in Danish for the use of the questionnaire
Εικονογραφικά προγράμματα σε βυζαντινούς σταυρεπίστεγους ναούς
Creators: name: Φουστέρης, Γεώργιος Π.
Publisher: name: Aristotle University of Thessaloniki
Year: 2006
Subjects: Εικονογραφικό πρόγραμμα
Σταυρεπίστεγος ναός
Iconographic program
Transverse-vault churches

description: Στην παρούσα διατριβή εξετάζεται το ζήτημα του εικογραφικού προγράμματος των βυζαντινών σταυρεπίστεγων ναών. Στο πρώτο μέρος παρουσιάζονται σε μορφή καταλόγου 49 βυζαντινοί ναοί στους οποίους σώζεται εν όλω ή εν μέρει το εικονογραφικό τους πρόγραμμα. Οι ναοί αυτοί καλύπτουν ένα χρονικό διάστημα 150 περίπου ετών από το πρώτο χρονολογημένο παράδειγμα(1244) μέχρι της αρχές του 15ου αιώνα. Σε κάθε λήμμα του καταλόγου γίνεται ανάλυση του εικονογραφικού προγράμματος συνοδευόμενη από πλήρη αποτύπωση και πρόσθετα ερμηνευτικά σχέδια, όπου είναι αναγκαίο. Στο δεύτερο μέρος γίνεται συνθετική προσέγγιση των ζητημάτων που σχετίζοτνται με το περιεχόμενο του εικονογραφικού προγράμματος, την διάταξη και την αφηγηματική φορά των παραστάσεων και την προσαρμογή στις αρχιτεκτορνικές επιφάνειες. Εξετάζονται οι σχέσεις μεταξύ των μνημείων και οι παράγοντες που καθορίζουν τις διάφορες επιλογές. Διαπιστώνεται α) η ελευθερία ως προς την διάταξη του βασικού χριστολογικού κύκλου με κύριο στοιχείο την αφηγηματικότητα β) η ποικιλία και η ευρηματικότητα με την οποία εντάσσονται στο εικονογραφικό πρόγραμμα πρόσθετοι κύκλοι(Παθών, Θεοτόκου, Αγίων)
description: In this thesis it is examined the iconographic program of the so-called Byzantine transverse-vault churches. The first part ia a catalogue of 49 Byzantine churches of the type which have preserved even partially their fresco program especially in the upper level. These examples cover a period about 150 years between 1244 from the first dated transverse-vault church with fresco decoration(1244) to the beginning of the 15th century. Each iconographic program of the catalogue is analyzed completely with detailed perspective plan and additional interpretative drawings where it necessary. In the second part we make a combined approach of the issues about the matter, the arrangement and the narrative process of the scenes and their layout on the architectural forms. It is examined the character of the interior fresco decoration, possible influences between the monuments and the factors who determined various choices. It is established that : a)the independence from rules and multiple choices about the areangement of the programme generally b)the variety and the inventiveness in the connection of additional cycles(Passion, life of Virgin, Life of Saints) with the Main Christological which bestrides in the majority of the programs
Two-dimensional Newton's Problem of Minimal Resistance
Creators: name: Silva, Cristiana J.
name: Torres, Delfim F. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 49K05; 76G25; 76M30

description: Newton's problem of minimal resistance is one of the first problems of optimal control: it was proposed, and its solution given, by Isaac Newton in his masterful Principia Mathematica, in 1686. The problem consists of determining, in dimension three, the shape of an axis-symmetric body, with assigned radius and height, which offers minimum resistance when it is moving in a resistant medium. The problem has a very rich history and is well documented in the literature. Of course, at first glance, one suspects that the two dimensional case should be well known. Nevertheless, we have looked into numerous references and ask at least as many experts on the problem, and we have not been able to identify a single source. Solution was always plausible to everyone who thought about the problem, and writing it down was always thought not to be worthwhile. Here we show that this is not the case: the two-dimensional problem is more rich than the classical one, being, in some sense, more interesting. Novelties include: (i) while in the classical three-dimensional problem only the restricted case makes sense (without restriction on the monotonicity of admissible functions the problem doesn't admit a local minimum), we prove that in dimension two the unrestricted problem is also well-posed when the ratio height versus radius of base is greater than a given quantity; (ii) while in three dimensions the (restricted) problem has a unique solution, we show that in the restricted two-dimensional problem the minimizer is not always unique - when the height of the body is less or equal than its base radius, there exists infinitely many minimizing functions.
description: Presented at the 4th Junior European Meeting on "Control and Optimization", Institute of Mathematics and Physics, Bialystok Technical University, Bialystok, Poland, 11-14 September 2005. Accepted (06-July-2006) to Control & Cybernetics
Λόγοι περί γυναικών στο έργο των ελλήνων υπερρεαλιστών
Creators: name: Τολίκα, Κατερίνα Ι.
Publisher: name: Aristotle University of Thessaloniki
Year: 2006
Subjects: Μπρετόν, "αγαπημένη"
Γυναίκα, έρωτας-ποίηση-Νέος Κόσμος
Υπερρεαλισμός/Υπερρεαλιστές
Breton, Beloved
Woman/female, Eros-Poetry-New World
Woman as Greece, Virgin Mary(Panaghia), Revolution, Expected, Erotic Couple

description: Το θέμα της διδακτορικής διατριβής αφορά τους λόγους περί γυναικών στο έργο των Ελλήνων υπερρεαλιστών Ανδρέα Εμπειρίκου, Νίκου Εγγονόπουλου, Νίκολα Κάλας, Εκτορα Κακναβάτου και Οδυσσέα Ελύτη. Σκοπός της έρευνας ήταν να καταγραφούν κατ'αρχήν και στη συνέχεια να επιχειρηθεί ερμηνεία των λόγων των συγγραφέων που αναφέρονται στο γυναικείο πρόσωπο. Βασικά μεθοδολογικά κλειδιά στην έρευνα στάθηκαν οι θεωρητικές σκέψεις του R. Barthes του Μ. Foucault, του Οδ. Ελύτη, του R. Jacobson, του C. Jung, η εικολογική μέθοδος κ.ά. Η διατριβή αποτελείται από πέντε ενότητες. Τα βασικότερα συμπεράσματα της έρευνας είναι τα ακόλουθα : η αγάπη κατέχει τη σημαντικότερη θέση στη ζωή και το έργο των υπερρεαλιστών. Η ποίηση είναι απόλυτα δεμένη με τον έρωτα και τη γυναίκα. Η ερωτική νέα γυναίκα και η γυναίκα-παιδί είναι τα κυρίαρχα γυναικεία πρόσωπα. Υπάρχουν πολλοί τύποι γυναικών όπως : γυναίκα-ποίηση, μουσική, παρθένα, θάλασσα, Ελλάδα, Παναγία, κ.ά. Οι Ελληνες υπερρεαλιστές επανιδρύουν το πρόσωπο της μάνας και κυρίως της ερωτικής γυναίκας που είναι νέα και όμορφη. Κυριαρχεί το απουσιάζον πρόσωπο και όχι η "υπαρκτή γυναίκα". Τέλος η αμοιβαιότητα στην αγάπη και το ελεύθερο ερωτικό ζευγάρι αποτελούν τα μεγάλα δώρα των υπερρεαλιστών
description: This dissertation deals with the ways greek surrealist poets perceived and talked about women and the female experience. The greek poets mentioned in this thesis are : Andreas Empeirikos, Nikos Eggonopoulos, Nikola kalas, Hector Kaknavatos and Odysseus Elytis. The goal of this research has been to record and also interpret the ways these writers chose to approach the woman. The primary methodological tools used in this dissertation consist of the theoretical thought of Roland Barthes, Michel Foucault, Odysseus Elytis, R. Jabobson, and Carl Jung. Five sections comprise this dissertation. The main findings/conclusions of this research are the following : love holds the most prominent spot in the life and work of these surrealist poets. Poetry is inextricably connected to Eros and to the woman. The erotic young woman and the woman-child are the dominating and recurring motives found in the poetry. There are also other types of motives, some of which are the following : the female as poetry, as music, as virginity, as the sea, as Greece, and as the Virgin Mary(Panaghia). Greek surrealist poets manage to reinvent the female as Mother and female as Erotic Woman, who appears as being young and beuatiful. A recurring motive is that of the "absent female" as opposed to the "present" and "real" woman. Finally, the reciprocity in love and the liberated erotic couple are two of the main contributions of the surrealist poets
EROs found behind lensing clusters. II. Stellar populations and dust properties of optical dropout EROs and comparison with related objects
Creators: name: Schaerer, D.
name: Hempel, A.
name: Egami, E.
name: Pello, R.
name: Richard, J.
name: Borgne, J. F. Le
name: Kneib, J. -P.
name: Wise, M.
name: Boone, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We determine the nature, redshift, stellar populations and dust properties of optically faint or non-detected extremely red objects (ERO) found from our survey of the lensing clusters A1835 and AC114. We perform SED fitting and use deep optical, HST, VLT, Spitzer data, and for some objects and sub-mm data. For most of the lensed EROs we find photometric redshifts showing a strong degeneracy between "low-z" (z~1-3) and high-z (z~6-7). Although formally best fits are often found at high-z, their resulting bright absolute magnitudes, the number density of these objects, and in some cases Spitzer photometry or longer wavelength observations, suggest strongly that all of these objects are at "low-z". The majority of these objects are best fitted with young (
description: 18 pages, 17 figures, accepted for publication in Astronomy and Astrophysics
The source of leaking ionizing photons from Haro11 -- Clues from HST/COS spectroscopy of knots A, B and C
Creators: name: Östlin, Göran
name: Rivera-Thorsen, T. Emil
name: Menacho, Veronica
name: Hayes, Matthew
name: Runnholm, Axel
name: Micheva, Genoveva
name: Oey, M. S.
name: Adamo, Angela
name: Bik, Arjan
name: Cannon, John M.
name: Gronke, Max
name: Kunth, Daniel
name: Laursen, Peter
name: Mas-Hesse, Miguel
name: Melinde, Jens
name: Messa, Matteo
name: Sirressi, Mattia
name: Smith, Linda
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Understanding the escape of ionizing (Lyman continuum) photons from galaxies is vital for determining how galaxies contributed to reionization in the early universe. While directly detecting Lyman continuum from high redshift galaxies is impossible due to the intergalactic medium, low redshift galaxies in principle offer this possibility, but requirie observations from space. The first local galaxy for which Lyman continuum escape was found is Haro11 , a luminous blue compact galaxy at z=0.02, where observations with the FUSE satellite revealed an escape fraction of 3.3 %. However the FUSE aperture covers the entire galaxy, and it is not clear from where the Lyman continuum is leaking out. Here we utilize HST/COS spectroscopy in the wavelength range 1100-1700 A of the three knots (A, B, and C) of Haro11 to study the presence of Ly-$α$ emission and the properties of intervening gas. We find that all knots have bright Ly-$α$ emission. UV absorption lines, originating in the neutral interstellar medium, as well as lines probing the ionized medium, are seen extending to blue shifted velocities of 500 km/s in all three knots, demonstrating the presence of an outflowing multiphase medium. We find that knots A and B have large covering fractions of neutral gas, making LyC escape along these sightlines improbable, while knot C has a much lower covering fraction ($\lesssim50$%). Knot C also has the the highest Ly-$α$ escape fraction and we conclude that it is the most likely source of the escaping Lyman continuum detected in Haro11.
description: 19 pages, 7 figures, accepted for publication in ApJ
Μάξιμος Πλανούδης: συμβολή στη μελέτη του βίου και του έργου του : το corpus των επιστολών του
Creators: name: Ταξίδης, Ηλίας
Publisher: name: Aristotle University of Thessaloniki
Year: 2006
Subjects: Planoudis, Maximos
Επιστολές
Προσωπογραφικά σχόλια
Γλώσσα και ρητορική
Letters
Prosopographical commentary
Language and rhetoric

description: Η παρούσα διατριβή επιδιώκει κατά κύριο λόγο να αναδείξει την πολύπλευρη και εξαιρετικά ενδιαφέρουσα προσωπικότητα του λόγιου μοναχού, Μάξιμου Πλανούδη(περ. 1255-περ. 1305), όπως αυτή στοιχειοθετείται με βάση το περιεχόμενο των επιστολών του. Με γνώμονα, μάλιστα, την αρχή η μελέτη να είναι στενά συνυφασμένη με το τι πιθανότητα επεδίωκε ο δημιουργός με το έργο του, η προσπάθεια αυτή έχει ως στόχο να τον εντάξει ως επιστολογράφο μέσα στο κοινωνικό και πνευμαικό του περιβάλλον και ταυτόχρονα να εξετάσει το επιστολογραφικό του έργο-όσο αυτό είναι δυνατόν-και ως αυτόνομο λογοτεχνικό δημιούργημα και ως πηγή προβολής ιδεών και αντιλήψεων
description: The present thesis aims mainly to reveal the scholar monk Maximos Planoudis's(1255-1305 approximately) versatile and extremely interesting personality as this is unveiled on the basis of the content of his letters. Taking under consideration the principle that the study should be closely related to what the writer possibly aimed at with his work, the object of this research is to classify him as an epistolographer in his social and cultural environenment and at the same time to study-as far as possible-his epistolographic work both as an autonomous literary creation and as an indication of the epistolographer's ideas and beliefs
Families of conformally related asymptotically flat, static vacuum data
Creators: name: Friedrich, Helmut
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Extending the results of an earlier article we give a complete description of the asymptotically flat, conformally non-flat, static vacuum data which admit non-trivial, asymptotically smooth conformal mappings onto other such data. These data form a 3-parameter family which decomposes into 1-parameter families of data which are conformal to each other. The data and the associated static vacuum solutions are given explicitly in terms of elliptic and, in a special case, elementary functions.
description: 18 pages
Permutation-Invariant Quantum Codes for Deletion Errors
Creators: name: Shibayama, Taro
name: Hagiwara, Manabu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: This paper presents conditions for constructing permutation-invariant quantum codes for deletion errors and provides a method for constructing them. Our codes give the first example of quantum codes that can correct two or more deletion errors. Also, our codes give the first example of quantum codes that can correct both multiple-qubit errors and multiple-deletion errors. We also discuss a generalization of the construction of our codes at the end.
Topology and Dynamics of Attractor Neural Networks: The Role of Loopiness
Creators: name: Zhang, Pan
name: Chen, Yong
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We derive an exact representation of the topological effect on the dynamics of sequence processing neural networks within signal-to-noise analysis. A new network structure parameter, loopiness coefficient, is introduced to quantitatively study the loop effect on network dynamics. The large loopiness coefficient means the large probability of finding loops in the networks. We develop the recursive equations for the overlap parameters of neural networks in the term of the loopiness. It was found that the large loopiness increases the correlations among the network states at different times, and eventually it reduces the performance of neural networks. The theory is applied to several network topological structures, including fully-connected, densely-connected random, densely-connected regular, and densely-connected small-world, where encouraging results are obtained.
description: 6 pages, 4 figures, comments are favored
Ανάλυση της αγοράς δικαιωμάτων μεταφοράς ηλεκτρικής ενέργειας
Creators: name: Ζιώγος, Νικόλαος Π.
Publisher: name: Aristotle University of Thessaloniki
Year: 2006
Subjects: Αγορά δικαιωμάτων μεταφοράς
Αγορά ενέργειας
Δικαιώματα ροοθύρων
Transmission rights auction
Energy market
Flow-gate rights

description: Στην παρούσα διδακτορική διατριβή αναλύεται μια μηνιαία και μια ετήσια αγορά δικαιωμάτων μεταφοράς ηλεκτρικής ενέργειας και παρουσιάζεται μια μεθοδολογία ανάπτυξης βέλτιστων στρατηγικών ζήτησης δικαιωμάτων μεταφοράς
description: In this Phd Thesis a monthly and an annual transmission rights auction in electricity markets is analyzed and a methodology of development optimal bidding strategies in transmission rights auctions is presented
Practices of re-naming and re-semanticizing places in Ibn Gubayr’s Journey (Rihla, XII century)
Creators: name: Morazzoni, Monica
name: Zavettieri, Giovanna Giulia
name: Scafa, Lisa
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2023

description: Il presente lavoro prende spunto dal resoconto di viaggio di Ibn Gubayr (1145-1217) per dimostrare che la presenza araba in Sicilia ha contribuito a risemantizzare questo spazio geografico, dotandolo di significati informati dalla cultura e dalle percezioni islamiche. Riletti oggi, i toponimi offrono un punto di partenza per ricostruire lo spazio arabo nell'isola. La ricerca combina tre ambiti: la letteratura di viaggio, la toponomastica e la cartografia storica e digitale.
description: Semestrale di studi e ricerche di geografia, N. 1 (2023): Critical toponimy: practices of (re)naming and the power to trasnform time into space
Infrared variable stars in the compact elliptical galaxy M32
Creators: name: Jones, O. C.
name: Nally, C.
name: Sharp, M. J.
name: McDonald, I.
name: Boyer, M. L.
name: Meixner, M.
name: Kemper, F.
name: Ferguson, A. M. N.
name: Goldman, S. R.
name: Rich, R. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Variable stars in the compact elliptical galaxy M32 are identified, using three epochs of photometry from the Spitzer Space Telescope at 3.6 and 4.5 $μ$m, separated by 32 to 381 days. We present a high-fidelity catalogue of sources detected in multiple epochs at both 3.6 and 4.5 $μ$m, which we analysed for stellar variability using a joint probability error-weighted flux difference. Of these, 83 stars are identified as candidate large-amplitude, long-period variables, with 28 considered high-confidence variables. The majority of the variable stars are classified as asymptotic giant branch star candidates using colour-magnitude diagrams. We find no evidence supporting a younger, infrared-bright stellar population in our M32 field.
description: 11 pages, 8 figures. Accepted for publication in MNRAS
Procesos de retoponimización en España
Creators: name: Esteban Rodríguez, Samuel
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2023

description: En España, existen diferentes procesos de retoponimización que afectan al espacio intraurbano; destacan la aplicación de la Ley de Memoria Histórica y la traducción de los nombres de las calles a las lenguas regionales. En este trabajo, a partir del callejero del censo electoral, se ha estudiado la intensidad de cada uno de ellos en cada región. Las modificaciones ligadas al idioma han supuesto mayor número de cambios que las vinculadas con la Ley de Memoria Histórica, pese a tener esta última mayor alcance territorial.
description: Semestrale di studi e ricerche di geografia, N. 1 (2023): Critical toponimy: practices of (re)naming and the power to trasnform time into space
Cosmological singularity as an informational seed for Everything
Creators: name: Cherkas, S. L.
name: Kalashnikov, V. L.
Publisher: name: arXiv
Year: 2019
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences
subject: J.2; H.1.1; H.3.2; I.2.m
subject: 81S99, 81T20, 83D99, 85A40

description: It is shown how to place some amount of matter into the cosmological singularity and to encode its state. A free and massless scalar field is considered as a prototype of matter. Two different but coherent approaches to this issue are presented. The expression for the scalar particles' spectral energy density, which is initially encoded at the singularity, is deduced. An informational aspect of the problem is discussed.
description: 14 pages, 2 figures
Local bulk operators in AdS/CFT: A holographic description of the black hole interior
Creators: name: Hamilton, Alex
name: Kabat, Daniel
name: Lifschytz, Gilad
name: Lowe, David A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: To gain insight into how bulk locality emerges from the holographic conformal field theory, we reformulate the bulk to boundary map in as local a way as possible. In previous work, we carried out this program for Lorentzian AdS, and showed the support on the boundary could always be reduced to a compact region spacelike separated from the bulk point. In the present work the idea is extended to a complexified boundary, where spatial coordinates are continued to imaginary values. This continuation enables us to represent a local bulk operator as a CFT operator with support on a finite disc on the complexified boundary. We treat general AdS in Poincare coordinates and AdS3 in Rindler coordinates. We represent bulk operators inside the horizon of a BTZ black hole and we verify that the correct bulk two point functions are reproduced, including the divergence when one point hits the BTZ singularity. We comment on the holographic description of black holes formed by collapse and discuss locality and holographic entropy counting at finite N.
description: 37 pages, LaTeX, 4 eps figures. v2: expanded introduction, version to appear in PRD
Community development and the Northwest Territories Northern Land Use Planning Program
Creators: name: Green, Leslie Joan
Publisher: name: University of British Columbia
Year: 2011

description: This study identifies and assesses the implications for community development in the Northwest Territories resulting from the structures and processes that have evolved from the Northwest Territories Northern Land Use Planning Program. Community development is described as a purposeful learning process whereby people identify their situation and plan and implement appropriate responses to it The original development strategies that have been applied to the Northwest Territories have been overwhelrningly modeled after the Western economic model, and have contributed to the dependency of northern communities upon government. Community development can help alleviate the powerlessness and economic and political dependency native northerners experience. Community development literature argues that any process leaving out those most affected by decisions will not lead to self-reliance. The Northern Land Use Planning Program was established as a "community-based" process to resolve land use conflicts; its 1983 Basis of Agreement mandated the sharing of authority to make land use plans between the native organizations, and the federal and territorial governments. The principle implication of the findings of this study is that although the Northern Land Use Planning Program is described as a community-based process, and has the potential and opportunity to develop structures and processes which contribute to community development in the Northwest Territories, it has done little to reduce dependency of communities on government. This is because the key elements of decision-making in the Northern Land Use Planning Program are held external to the communities.