cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
From the BTZ black hole to JT gravity: geometrizing the island
Creators: name: Verheijden, Evita
name: Verlinde, Erik
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the evaporation of two-dimensional black holes in JT gravity from a three-dimensional point of view. A partial dimensional reduction of AdS$_3$ in Poincaré coordinates leads to an extremal 2D black hole in JT gravity coupled to a 'bath': the holographic dual of the remainder of the 3D spacetime. Partially reducing the BTZ black hole gives us the finite temperature version. We compute the entropy of the radiation using geodesics in the three-dimensional spacetime. We then focus on the finite temperature case and describe the dynamics by introducing time-dependence into the parameter controlling the reduction. The energy of the black hole decreases linearly as we slowly move the dividing line between black hole and bath. Through a re-scaling of the BTZ parameters we map this to the more canonical picture of exponential evaporation. Finally, studying the entropy of the radiation over time leads to a geometric representation of the Page curve. The appearance of the island region is explained in a natural and intuitive fashion.
description: 22 pages, 5 figures. v2: comments and references added, typos fixed; clarification of dynamics. v3: references added, typos fixed; topological piece of dilaton removed from formulas (results unchanged). v4: version as published in JHEP
On Cherednik and Nazarov-Sklyanin large N limit construction for integrable many-body systems with elliptic dependence on momenta
Creators: name: Grekov, A.
name: Zotov, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Algebra (math.QA)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The infinite number of particles limit in the dual to elliptic Ruijsenaars model (coordinate trigonometric degeneration of quantum double elliptic model) is proposed using the Nazarov-Sklyanin approach. For this purpose we describe double-elliptization of the Cherednik construction. Namely, we derive explicit expression in terms of the Cherednik operators, which reduces to the generating function of Dell commuting Hamiltonians on the space of symmetric functions. Although the double elliptic Cherednik operators do not commute, they can be used for construction of the $N\rightarrow \infty$ limit.
description: 38 pages, minor changes, typos corrected
A mission to test the Pioneer anomaly: estimating the main systematic effects
Creators: name: Bertolami, O.
name: Paramos, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We estimate the main systematic effects relevant in a mission to test and characterize the Pioneer anomaly through the flight formation concept, by launching probing spheres from a mother spacecraft and tracking their motion via laser ranging.
description: 9 pages, 1 table, 2 figures; based on a talk presented by one of us (O.B.) at the 2nd. Pioneer Anomaly Group Meeting at the International Space Science Institute, 19-23 February 2007
Power Spectrum Shape from Peculiar Velocity Data
Creators: name: Watkins, Richard
name: Feldman, Hume A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We constrain the velocity power spectrum shape parameter $Γ$ in linear theory using the nine bulk-flow and shear moments estimated from four recent peculiar velocity surveys. For each survey, a likelihood function for $Γ$ was found after marginalizing over the power spectrum amplitude $σ_8Ω_m^{0.6}$ using constraints obtained from comparisons between redshift surveys and peculiar velocity data. In order to maximize the accuracy of our analyses, the velocity noise $σ_*$ was estimated directly for each survey. A statistical analysis of the differences between the values of the moments estimated from different surveys showed consistency with theoretical predictions, suggesting that all the surveys investigated reflect the same large scale flows. The peculiar velocity surveys were combined into a composite survey yielding the constraint $Γ=0.13^{+0.09}_{-0.05}$. This value is lower than, but consistent with, values obtained using redshift surveys and CMB data.
description: 10 pages, 2 figures, 3 tables, some changes to reflect published article
Noisy Recurrent Neural Networks
Creators: name: Lim, Soon Hoe
name: Erichson, N. Benjamin
name: Hodgkinson, Liam
name: Mahoney, Michael W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Dynamical Systems (math.DS)
subject: Probability (math.PR)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We provide a general framework for studying recurrent neural networks (RNNs) trained by injecting noise into hidden states. Specifically, we consider RNNs that can be viewed as discretizations of stochastic differential equations driven by input data. This framework allows us to study the implicit regularization effect of general noise injection schemes by deriving an approximate explicit regularizer in the small noise regime. We find that, under reasonable assumptions, this implicit regularization promotes flatter minima; it biases towards models with more stable dynamics; and, in classification tasks, it favors models with larger classification margin. Sufficient conditions for global stability are obtained, highlighting the phenomenon of stochastic stabilization, where noise injection can improve stability during training. Our theory is supported by empirical results which demonstrate that the RNNs have improved robustness with respect to various input perturbations.
description: 38 pages
Η αστική ευθύνη του Δημοσίου για παραβιάσεις του Δικαίου της Ευρωπαϊκής Ένωσης:
Creators: name: Μπήινα, Ελένη Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: αστική ευθύνη
αγωγή κακοδικίας
δεδικασμένο
state liability
Köbler
Francovich

description: Η παρούσα μελέτη αφορά στο δικαίωμα διεκδίκησης αποζημίωσης που έχουν οι ιδιώτες έναντι του κράτους τους και κράτους-μέλους της Ευρωπαϊκής Ένωσης, μετά από ζημία που υπέστησαν από πράξη ή παράλειψη κρατικού οργάνου, η οποία παρέβη διατάξεις του Δικαίου της Ευρωπαϊκής Ένωσης. Ερευνά το τι ίσχυε πριν τη θεμελίωση της αρχής της ευθύνης των κρατών-μελών, που θεωρείται σύμφυτη με το σύστημα των Συνθηκών, στη Νομολογία του ΔΕΚ/ΔΕΕ. Παρατίθενται οι ουσιαστικές-όπως διατυπώθηκαν στην απόφαση Brasserie du Pêcheur- και οι δικονομικές προϋποθέσεις που πρέπει να πληρούνται για να είναι δυνατή η διεκδίκηση αποζημίωσης και να θεωρείται η απόδοση δικαιοσύνης πλήρης και αποτελεσματική. Μελετώνται ειδικότερα θέματα βάσει των οργάνων που παρανομούν. Ιδιαίτερη ανάλυση γίνεται στις παραβάσεις των εθνικών ανώτατων δικαστηρίων με αφορμή την απόφαση Köbler. Τέλος, παρουσιάζεται το ισχύον στην ελληνική έννομη τάξη καθεστώς και η συμβατότητά του με το Δίκαιο της Ευρωπαϊκής Ένωσης, με ιδιαίτερη έμφαση στην αγωγή κακοδικίας που θεωρείται στην Ελλάδα το κατάλληλο ένδικο βοήθημα σε περιπτώσεις παραβιάσεων από δικαστικούς λειτουργούς.
description: This thesis examines the right of European Union (EU) citizens to sue their State (and EU member-state), for any losses and damages they suffered as a result of unlawful actions or omissions of a public authority, according to EU law. It investigates what was in force before the foundation of the State Liability principle of member states, which is inherent in the system of the Treaty, in the jurisprudence of the Court of the EU. The conditions -as formulated in Brasserie du Pêcheur- and procedural terms that must be fulfilled for effective judicial protection, are also cited. Issues based on the premise of public authority causing law infringement, are examined in greater detail. Specifically, based on the Köbler Judgment, this thesis analyzes EU law breaches as a result of actions taken by national courts of last instance. Finally, this thesis describes the current practice around the subject in accordance to the Greek Law and compares it with the EU Law. Special attention is paid to the lawsuit for mistrial which is considered to be the appropriate remedy given to the plaintiffs, for breaches by adjudicators.
Optimizing the Reduction of One-Loop Amplitudes
Creators: name: Mastrolia, P.
name: Ossola, G.
name: Papadopoulos, C. G.
name: Pittau, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present an optimization of the reduction algorithm of one-loop amplitudes in terms of master integrals. It is based on the exploitation of the polynomial structure of the integrand when evaluated at values of the loop-momentum fulfilling multiple cut-conditions, as emerged in the OPP-method. The reconstruction of the polynomials, needed for the complete reduction, is rended very versatile by using a projection-technique based on the Discrete Fourier Transform. The novel implementation is applied in the context of the NLO QCD corrections to u d-bar --> W+ W- W+.
Determining the CKM angle gamma with B_c decays
Creators: name: Giri, A. K.
name: Mawlong, B.
name: Mohanta, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the possibility of extracting the CKM angle $γ$ with $B_c$ decays. The modes $B_c^\pm \to (D^0) D_s^\pm \to (K^{*+}K^-) D_s^\pm $ and $B_c^\pm \to (\bar D^0) D_s^\pm \to (K^{*+}K^-) D_s^\pm $ are found to be well suited for the extraction of $γ$. Since a large number of $B_c$ mesons are expected to be produced at the LHC, it would be very interesting to explore the determination of $γ$ with these modes.
description: 9 pages
Dynamic Cooper Pair Splitter
Creators: name: Brange, Fredrik
name: Prech, Kacper
name: Flindt, Christian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Cooper pair splitters are promising candidates for generating spin-entangled electrons. However, the splitting of Cooper pairs is a random and noisy process, which hinders further synchronized operations on the entangled electrons. To circumvent this problem, we here propose and analyze a dynamic Cooper pair splitter that produces a noiseless and regular flow of spin-entangled electrons. The Cooper pair splitter is based on a superconductor coupled to quantum dots, whose energy levels are tuned in and out of resonance to control the splitting process. We identify the optimal operating conditions for which exactly one Cooper pair is split per period of the external drive and the flow of entangled electrons becomes noiseless. To characterize the regularity of the Cooper pair splitter in the time domain, we analyze the $g^{(2)}$-function of the output currents and the distribution of waiting times between split Cooper pairs. Our proposal is feasible using current technology, and it paves the way for dynamic quantum information processing with spin-entangled electrons.
description: 6 pages, 3 figures
Monotonic and cyclic pullout resistance of geosynthetics
Creators: name: Raju, Muthu
Publisher: name: University of British Columbia
Year: 2009

description: An evaluation of soil-geosynthetic interface strength for different types of loading is important to the design of any anchorage detail of a reinforced soil structure or membrane-lined waste containment facility. The imposed loadings may be classified as static, repeated non-dynamic or cyclic, and dynamic. The test method best suited to model the anchorage behaviour is the pullout test. A large scale pullout apparatus was designed that accommodates a soil sample 1.30 m long x 0.64 m wide x 0.60 m thick. Samples of a uniformly-graded medium sand were prepared by air pluviation. A stress-controlled top boundary was used and tests performed for normal stresses in the range 4 to 30 kPa. Tests were performed on five types of geosynthetics: three geogrids, a smooth geomembrane and a textured geomembrane. A sophisticated electro-hydraulic control system was developed and two modes of testing were used to evaluate pullout resistance. The response of the geosynthetic is characterized by a non-linear variation of tensile force along the specimen. Consequently the profile of shear stress variation is non-linear and is dependent on the magnitude of pullout displacement: interpretation of the pullout test to obtain an interaction factor for design should account for this extensible behaviour. A generalized method is proposed for use with independent measurements of force and strain. The application of the generalized method is demonstrated: it describes very well the variation of interaction factor with pullout displacement and suggests a unique value that is independent of normal stress. Cyclic loading of the test specimen in most cases reveals that an interaction factor mobilized is equal to or slightly exceeds the value mobilized in corresponding DC test. A load ratio is defined as the ratio of the measured pullout load in cyclic pullout test to the corresponding DC test. A conceptual model is proposed that links a load ratio to stable and unstable behaviour in cyclic pullout, and identifies a threshold ratio above which an unstable behaviour results. The threshold ratio is observed to be influenced by the specimen characteristic, being >1 for a grid specimen with a relatively rigid bearing member, and =1 for all other test specimens except a few tests where a value <1 was observed. This implies that using a reduced value of interaction factor for dynamic loads in all cases is inappropriate, in that it does not properly describe the mobilized response.
Quantum critical point in the spin glass-antiferromagnetism competition in Kondo-lattice systems
Creators: name: Magalhaes, S. G.
name: Zimmer, F. M.
name: Coqblin, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A theory is proposed to describe the competition among antiferromagnetism (AF), spin glass (SG) and Kondo effect. The model describes two Kondo sublattices with an intrasite Kondo interaction strength $J_{K}$ and an interlattice quantum Ising interaction in the presence of a transverse field $Γ$. The interlattice coupling is a random Gaussian distributed variable (with average $-2J_0/N$ and variance $32 J^{2}/N$) while the $Γ$ field is introduced as a quantum mechanism to produce spin flipping. The path integral formalism is used to study this fermionic problem where the spin operators are represented by bilinear combinations of Grassmann fields. The disorder is treated within the framework of the replica trick. The free energy and the order parameters of the problem are obtained by using the static ansatz and by choosing both $J_0/J$ and $Γ/J \approx (J_k/J)^2$ to allow, as previously, a better comparison with the experimental findings. The results indicate the presence of a SG solution at low $J_K/J$ and for temperature $T
description: 11 pages, 3 figures, accepted for publication in J. Phys. C
Smart Navigation for In-pipe Robots with Multi-phase Motion Control and Particle Filter
Creators: name: Kazeminasab, Saber
name: Janfaza, Vahid
name: Razavi, Moein
name: Banks, M. Katherine
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In-pipe robots are promising solutions for condition assessment, leak detection, water quality monitoring in a variety of other tasks in pipeline networks. Smart navigation is an extremely challenging task for these robots as a result of highly uncertain and disturbing environment for operation. Wireless communication to control these robots during operation is not feasible if the pipe material is metal since the radio signals are destroyed in the pipe environment, and hence, this challenge is still unsolved. In this paper, we introduce a method for smart navigation for our previously designed in-pipe robot [1] based on particle filtering and a two-phase motion controller. The robot is given the map of the operation path with a novel approach and the particle filtering determines the straight and non-straight configurations of the pipeline. In the straight paths, the robot follows a linear quadratic regulator (LQR) and proportional-integral-derivative (PID) based controller that stabilizes the robot and tracks a desired velocity. In non-straight paths, the robot follows the trajectory that a motion trajectory generator block plans for the robot. The proposed method is a promising solution for smart navigation without the need for wireless communication and capable of inspecting long distances in water distribution systems.
title: Bildungsbiografische Erfahrungen junger Menschen mit Unterstützungsbedarf der emotionalen und sozialen Entwicklung im Kontext segregierender und inklusiver Bildungsangebote
title: eine vergleichende retrospektive Bestandsaufnahme
titleType: Subtitle
Creators: name: Hengelage, Lena Sophie
Publisher: name: Universität Paderborn
Year: 2019

description: Paderborner Schriften zur sonderpädagogischen Förderung, Band 3
Τετραγωνικά πολυώνυμα που παράγουν πρώτους και αριθμός κλάσεων:
Creators: name: Αθανάσογλου, Συμεών Αλέξανδρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: τετραγωνικά πολυώνυμα
πρώτοι αριθμοί
αριθμός κλάσεων
quadratic polynomials
prime numbers
class number

description: Σκοπός αυτής της διπλωματικής εργασίας είναι η μελέτη των τετραγωνικών πολυωνύμων που παράγουν πρώτους αριθμούς και το πώς αυτά σχετίζονται με τον αριθμό κλάσεων. Αρχικά, δίνουμε τα στοιχεία της αλγεβρικής θεωρίας αριθμών που μας είναι απαραίτητα γι’ αυτήν τη μελέτη. Στη συνέχεια, επικεντρωνόμαστε στα τετραγωνικά πολυώνυμα που παράγουν πρώτους αριθμούς σε μιγαδικά και σε πραγματικά σώματα αριθμών. Ακόμη, αναπτύσσουμε το άρθρο της Anitha Srinivasan “Prime Producing Quadratic Polynomials and Class Number One or Two” (The Ramanujan Journal, 10, 5-22), που δημοσιεύτηκε το 2005 και το οποίο συνδέει τα τετραγωνικά πολυώνυμα με τον αριθμό κλάσεων των τετραγωνικών σωμάτων αριθμών. Ασχολούμαστε, επιπλέον, με τη θεωρία των τετραγωνικών μορφών η οποία μας είναι απαραίτητη για την απόδειξη των κύριων αποτελεσμάτων του άρθρου.
description: The aim of this master thesis is the study of prime producing quadratic polynomials and how the class number is related to them. First, we give the basics of algebraic number theory which are important to us in this study. Next, we focus on prime producing quadratic polynomials at complex and at real fields. We also analyze the paper of Anitha Srinivasan “Prime Producing Quadratic Polynomials and Class Number One or Two” (The Ramanujan Journal, 10, 5-22), which was published in 2005 and is connecting the quadratic polynomials with the class number of quadratic fields. Furthermore, we examine the theory of quadratic forms which is necessary to us, to prove the main results of this paper.
Blandford-Znajek mechanism in the general stationary axially-symmetric black-hole spacetime
Creators: name: Konoplya, R. A.
name: Kunz, J.
name: Zhidenko, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the Blandford-Znajek process of electromagnetic extraction of energy from a general axially symmetric asymptotically flat slowly rotating black hole. Using the general parametrization of the black-hole spacetime we construct formulas for the flux of the magnetic field and the rate of energy extraction, which are valid not only for the Kerr spacetime, but also for its arbitrary axially symmetric deformations. We show that in the dominant order these quantities depend only on a single deformation parameter, which relates the spin frequency of a black hole with its rotation parameter.
description: 8 pages, revtex
Χαρακτηρισμός φάσεων του θερμοηλεκτρικού συστήματος Mg2Si(0.55-x)Sn0.4Ge0.05Mx (Μ:Bi, Sb) με μεθόδους ηλεκτρονικής μικροσκοπίας.:
Creators: name: Χατζηελευθεριάδου, Αγγελική Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Θερμοηλεκτρικά
Ηλεκτρονική μικροσκοπία διερχόμενης δέσμης
Ηλεκτρονική μικροσκοπία υψηλής διακριτικής ικανότητας
Thermoelectrics
TEM
HRTEM

description: Τα τελευταία χρόνια υπάρχει έντονο ενδιαφέρον για την ανάπτυξη της θερμοηλεκτρικής τεχνολογίας λόγω των πλεονεκτημάτων και των πολλαπλών εφαρμογών της. Πυριτιούχα μέταλλα όπως το Mg2Si και τα κράματα του, αντιπροσωπεύουν μια κατηγορία διαμεταλλικών ενώσεων που είναι ελκυστικά λόγω της αφθονίας και της χαμηλής τοξικότητας των συστατικών τους. Επιπλέον, η προσεκτική επιλογή των προσμίξεων και η σύνθεση του κράματος μπορεί να δώσει υψηλές τιμές του ZT. Αρχικά, γίνεται μια εισαγωγή στα θερμοηλεκτρικά φαινόμενα, παρουσιάζονται οι ιδιότητες των θερμοηλεκτρικών υλικών καθώς και οι εφαρμογές των θερμοηλεκτρικών διατάξεων. Στη συνέχεια, παρατίθεται η βασική θεωρία της ηλεκτρονικής μικροσκοπίας διερχόμενης δέσμης, οι τεχνικές και οι βασικοί τρόποι παρατήρησης που χρησιμοποιήθηκαν στην παρούσα εργασία. Παρατηρήσεις TEM για τα συστήματα Mg2Si(0.55-x)Sn0.4Ge0.05Mx (Μ:Bi, Sb) έδειξαν ότι αυτά τα συστήματα εμφανίζουν διαχωρισμό φάσεων σε διαστάσεις νανοκλίμακας. Επίσης, χρησιμοποιήθηκαν παρατηρήσεις HRTEM για την εκτίμηση του μεγέθους των νανοκρυσταλλιτών. Τέλος, παρουσιάζονται τα γενικά συμπεράσματα που προέκυψαν από την ανάλυση των τριών συστημάτων.
description: There is intense interest to develop thermoelectric technology because of the advantages and the numerous applications. Metal silicides as Mg2Si and its alloys represent a class of intermetallic compounds that are attractive because of the abundance and low toxicity of their ingredients. Furthermore, the careful choice of the dopants and the composition of the alloy can produce high values of ZT. Initially, an introduction to the thermoelectric phenomena is presented, along with the features of thermoelectric materials and the applications of thermoelectric modules. Next, an introduction to the basic theory of transmission electron microscopy is presented, as well as the techniques and the basic observation modes. TEM observations showed that the thermoelectric systems Mg2Si(0.55-x)Sn0.4Ge0.05Mx (Μ:Bi, Sb) present phase separation at nanoscale. HRTEM observations were used in order to evaluate the size of the nanocrystallites. Finally, the conclusions that were drawn from the analysis of these systems are presented.
Deterministic preparation of non-classical states of light in cavity-optomechanics
Creators: name: Ling, Yuxun
name: Mintert, Florian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Cavity-optomechanics is an ideal platform for the generation non-Gaussian quantum states due to the anharmonic interaction between the light field and the mechanical oscillator; but exactly this interaction also impedes the preparation in pure states of the light field. In this paper we derive a driving protocol that helps to exploit the anharmonic interaction for state preparation, and that ensures that the state of the light field remains close-to-pure. This shall enable the deterministic preparation of photon Fock states or coherent superpositions thereof.
On Gibbsianness of Random Fields
Creators: name: Dachian, Serguei
name: Nahapetian, Boris
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The problem of characterization of Gibbs random fields is considered. Various Gibbsianness criteria are obtained using the earlier developed one-point framework which in particular allows to describe random fields by means of either one-point conditional or one-point finite-conditional distributions. The main outcome are the criteria in terms of one-point finite-conditional distribution, one of which can be taken as a purely probabilistic definition of Gibbs random field.
Σύνθεση, δομή και βιολογική δράση συμπλόκων ενώσεων του Co(II) με μη-στεροειδή αντιφλεγμονώδη φάρμακα:
Creators: name: Τσίλιου, Σοφία Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: κοβάλτιο
μη-στεροειδή αντιφλεγμονώδη φάρμακα
βιολογική δράση
cobalt
non-steroidal antiinflammatory drugs
biological activity

description: Παρασκευάστηκαν και μελετήθηκαν σύμπλοκα του Co(II) με τα μη-στεροειδή αντιφλεγμονώδη φάρμακα mefenamic acid, niflumic acid, flufenamic acid και diflunisal παρουσία Ν-δοτών ή/και Ο-δοτών. Από τα σύμπλοκα που παρασκευάστηκαν, επιλύθηκε με κρυσταλλογραφία ακτίνων–Χ η δομή των μονοπυρηνικών συμπλόκων [Co(difl)2(MeOH)4], [Co(nifl)2(MeOH)4], [Co(fluf)2(bipyam)] και [Co(mef)2(bipyam)] καθώς και του τριπυρηνικού συμπλόκου [Co3(fluf)6(bipy)2]. Ο χαρακτηρισμός των ενώσεων έγινε με φυσικοχημικές τεχνικές, όπως στοιχειακές αναλύσεις, μετρήσεις μοριακής αγωγιμότητας και μαγνητικές μετρήσεις σε θερμοκρασία δωματίου, με φασματοσκοπία IR και UV-Vis και με κυκλική βολταμμετρία. Όλες οι σύμπλοκες ενώσεις είναι διαλυτές και σταθερές σε DMSO γι΄αυτό και η μελέτη των ενώσεων σε διάλυμα έγινε σε DMSO. Μελετήθηκε η αλληλεπίδραση των συμπλόκων ενώσεων με το calf-thymus DNA με φασματοσκοπία UV, κυκλική βολταμμετρία και ιξωδομετρία. Επίσης, εκτιμήθηκε η ικανότητα των ενώσεων να ανταγωνίζονται το αιθίδιο βρωμίδιο στη σύνδεση με το calf-thymus DNA. Η αλληλεπίδραση των συμπλόκων ενώσεων με την ανθρώπινη (HSA) και τη βοοειδή (BSA) αλβουμίνη ορού αίματος εξετάστηκε με φασματοσκοπία φθορισμού. Η αντιοξειδωτική ικανότητα των ενώσεων αξιολογήθηκε με βάση την ικανότητα δέσμευσης των ριζών DPPH, ABTS και OH και συγκρίθηκε με αυτή των ενώσεων αναφοράς NDGA, BHT και Trolox που είναι γνωστοί αντιοξειδωτικοί παράγοντες.
description: The synthesis and the characterization of cobalt(II) complexes with the non-steroidal antiinflammatory drugs mefenamic acid, niflumic acid, flufenamic acid and diflunisal in the presence of N- or/and O-donor ligands was achieved. The crystal structures of the mononuclear complexes [Co(difl)2(MeOH)4], [Co(nifl)2(MeOH)4], [Co(fluf)2(bipyam)] and [Co(mef)2(bipyam)] and the trinuclear complex [Co3(fluf)6(bipy)2] were determined with X-ray crystallography. The characterization of the compounds was achieved with elemental analysis, molar conductivity measurements, magnetic measurements at room temperature, IR spectroscopy, UV-Vis spectroscopy and cyclic voltammetry. All compounds are soluble and stable in DMSO where all studies in solution were performed. The interaction of the complexes with calf-thymus DNA was studied with UV spectroscopy, cyclic voltammetry and viscosity measurements. The ability of the compounds to compete ethidium bromide for the binding to calf-thymus DNA was evaluated, too. The interaction of the complexes with human (HSA) and bovein (BSA) albumin was investigated with fluoresence spectroscopy. The antioxidant capacity of complexes was estimated based on their activity to scavenge DPPH, ABTS and OH radicals, and was compared to the reference compounds NDGA, BHT and Trolox.
Statistische Probleme bei der Schätzung von Abflussspendendiagrammen
Creators: name: Fischer, Svenja
Publisher: name: Bundesanstalt für Gewässerkunde, Koblenz
Year: 2015
Subjects: subject: Water resources research

description: Hydrologie und Wasserbewirtschaftung / BfG – Jahrgang: 59.2015,4 - ISSN 1439-1783
Long-term monitoring of the short period SU UMa-type dwarf nova, V844 Herculis
Creators: name: Oizumi, Shota
name: Omodaka, Toshihiro
name: Yamamoto, Hiroyuki
name: Tanada, Shunsuke
name: Yasuda, Tatsuki
name: Arao, Yoshihiro
name: Kodama, Kie
name: Suzuki, Miho
name: Matsuo, Takeshi
name: Maehara, Hiroyuki
name: Nakajima, Kazuhiro
name: Dubovsky, Pavol A.
name: Kato, Taichi
name: Imada, Akira
name: Kubota, Kaori
name: Sugiyasu, Kei
name: Morikawa, Koichi
name: Torii, Ken'ichi
name: Uemura, Makoto
name: Ishioka, Ryoko
name: Tanabe, Kenji
name: Nogami, Daisaku
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on time-resolved CCD photometry of four outbursts of a short-period SU UMa-type dwarf nova, V844 Herculis. We successfully determined the mean superhump periods to be 0.05584(64) days, and 0.055883(3) for the 2002 May superoutburst, and the 2006 April-May superoutburst, respectively. During the 2002 October observations, we confirmed that the outburst is a normal outburst, which is the first recorded normal outburst in V844 Her. We also examined superhump period changes during 2002 May and 2006 April-May superoutbursts, both of which showed increasing superhump period over the course of the plateau stage. In order to examine the long-term behavior of V844 Her, we analyzed archival data over the past ten years since the discovery of this binary. Although photometry is not satisfactory in some superoutbursts, we found that V844 Her showed no precursors and rebrightenings. Based on the long-term light curve, we further confirmed V844 Her has shown almost no normal outbursts despite the fact that the supercycle of the system is estimated to be about 300 days. In order to explain the long-term light curves of V844 Her, evaporation in the accretion disk may play a role in the avoidance of several normal outbursts, which does not contradict with the relatively large X-ray luminosity of V844 Her.
description: 10 pages, 11 figures, accepted for PASJ
Analysis and Engineering of Polyene Biosynthesis in Actinomycetes
Creators: name: Usachova, Katsiaryna
Publisher: name: Apollo - University of Cambridge Repository
Year: 2019
Subjects: Actinomycete
Natural product
Polyene

description: The work in this thesis concerns the biosynthetic pathways to antibiotic natural products in actinomycete bacteria, and evaluates three different approaches to accessing novel chemical diversity from these pathways. In Chapter 1, major pathways of natural product biosynthesis in Streptomyces and allied bacteria are discussed, and methods for manipulating them to produce new derivatives. Chapter 2 sets out the Materials and Methods used in this work. Chapter 3 concerns the pathway to the giant linear polyol-polyene clethramycin from Streptomyces malaysiensis DSM4137, a rare sulfonated natural product. Gene deletion was used to identify the essential sulfotransferase involved. In Chapter 4, a novel genetic engineering approach dubbed "accelerated evolution" was explored with the clethramycin PKS, which had previously been used to generate multiple analogues of the polyketide rapamycin. In this approach, recombination within the homologous modules of a PKS is stimulated and the resulting progeny are examined for the production of novel compounds. Unfortunately, the approach did not prove useful here, and possible reasons for this are discussed. In Chapter 5, genome mining was used to explore the rare genus Saccharopolyspora which has previously provided the valuable erythromycin A and spinosyn. The genomes of 20 strains of Saccharopolyspora were analysed, revealing over 400 gene clusters, including novel examples of valuable chemotypes. In Chapter 6, the gene cluster was characterised from Saccharopolyspora flava for one of these novel compounds, a macrocyclic polyene named here flavatericin. Conditions were found under which Sa. flava produced multiple flavatericins. The starter unit was identified as 3 hydroxybenzoic acid by expression and assay of the chorismatase gene ftcR. Deletion of ftcR abolished flavatericin production. One flavatericin component was purified to homogeneity and subject to NMR analysis. Chapter 7 summarises conclusions, and outlines suggestions for future work.
Ein Ansatz zur Validierung von Klimamodelldaten als Basis für die Interpretation von wasserwirtschaftlichen Klimafolgenabschätzungen in Niedersachsen
Creators: name: Petry, Uwe
Publisher: name: Bundesanstalt für Gewässerkunde, Koblenz
Year: 2015
Subjects: subject: Water resources research

description: Hydrologie und Wasserbewirtschaftung / BfG – Jahrgang: 59.2015,4 - ISSN 1439-1783
Klimabedingte Änderung von Hochwasserabflüssen im Aller-Leine-Einzugsgebiet - eine Fallstudie mit HBV-IWW
Creators: name: Wallner, Markus
Publisher: name: Bundesanstalt für Gewässerkunde, Koblenz
Year: 2015
Subjects: subject: Water resources research

description: Hydrologie und Wasserbewirtschaftung / BfG – Jahrgang: 59.2015,4 - ISSN 1439-1783
Connecting the discrete and continuous-time quantum walks
Creators: name: Strauch, Frederick W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Recently, quantized versions of random walks have been explored as effective elements for quantum algorithms. In the simplest case of one dimension, the theory has remained divided into the discrete-time quantum walk and the continuous-time quantum walk. Though the properties of these two walks have shown similarities, it has remained an open problem to find the exact relation between the two. The precise connection of these two processes, both quantally and classically, is presented. Extension to higher dimensions is also discussed.
description: 5 pages, 1 figure
Contrasting Centralized and Decentralized Critics in Multi-Agent Reinforcement Learning
Creators: name: Lyu, Xueguang
name: Xiao, Yuchen
name: Daley, Brett
name: Amato, Christopher
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Centralized Training for Decentralized Execution, where agents are trained offline using centralized information but execute in a decentralized manner online, has gained popularity in the multi-agent reinforcement learning community. In particular, actor-critic methods with a centralized critic and decentralized actors are a common instance of this idea. However, the implications of using a centralized critic in this context are not fully discussed and understood even though it is the standard choice of many algorithms. We therefore formally analyze centralized and decentralized critic approaches, providing a deeper understanding of the implications of critic choice. Because our theory makes unrealistic assumptions, we also empirically compare the centralized and decentralized critic methods over a wide set of environments to validate our theories and to provide practical advice. We show that there exist misconceptions regarding centralized critics in the current literature and show that the centralized critic design is not strictly beneficial, but rather both centralized and decentralized critics have different pros and cons that should be taken into account by algorithm designers.
Die Erinnerung der Generationen in Marcel Beyers „Spione“ und Tanja Dückers „Himmelskörper“:
Creators: name: Βαρσάμη, Σουλτάνα Απόστολου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: μνήμη γενεών
memοries of the generations

description: Σκοπός της διπλωματικής εργασίας ήταν να παρουσιάσει την μνήμη των γενεών μετά τον δεύτερο παγκόσμιο πόλεμο στο παράδειγμα των δύο λογοτεχνικών έργων, το „Spione“ του Marcel Beyer και το „Himmelkörper“ της Tanja Dückers. Η εργασία αποτελείται από τρία μέρη. Στο πρώτο μέρος παρουσιάζεται το θεωρητικό πλαίσιο των όρων μνήμη και γενιά. Στο δεύτερο μέρος αναλύονται και εξετάζονται τα δύο λογοτεχνικά έργα, εστιάζοντας στην μνήμη της τρίτης γενιάς και στο τρίτο μέρος επιχειρείται η σύγκριση των έργων.
description: The aim of the present study was to present the memories of the generations after the Second World War in the example of two literary works, “Spione” of Marcel Beyer and “Himmelkörper” of Tanja Dückers. The study consists of three parts. In the first part the theoretical frame of the terms “memory” and “generation” is presented. In the second part, the two literary works are analyzed and examined, with a focus on the memories of third generation and, finally, in the third part, a comparison of the two works is attempted.
A day in the life of a statistical knowledge for teaching course
Creators: name: Groth, Randall E.
Publisher: name: Maryland Shared Open Access Repository
Year: 2013
Subjects: statistical knowledge for teaching
teacher preparation
undergraduate statistics

description: Teachers’ statistical learning needs differ from those of individuals in other professions. Along with learning statistical content, they must develop the ability to teach statistics to others. This paper illustrates how both needs can be addressed simultaneously in an undergraduate course grounded in a statistical knowledge for teaching framework. A typical day in the course is presented to demonstrate application of the framework. It is also suggested that practicing teachers can benefit from using the framework to set their own professional development goals.
Enlarged NH symmetries: Particle Dynamics and Gauge Symmetries
Creators: name: Gomis, Joaquim
name: Lukierski, Jerzy
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show how the Newton-Hooke (NH) symmetries, representing a nonrelativistic version of de-Sitter symmetries, can be enlarged by a pair of translation vectors describing in Galilean limit the class of accelerations linear in time. We study the Cartan-Maurer one-forms corresponding to such enlarged NH symmetry group and by using cohomological methods we determine the general 2-parameter (in D=2+1 4-parameter)central extension of the corresponding Lie algebra. We derive by using nonlinear realizations method the most general group - invariant particle dynamics depending on two (in D=2+1 on four) central charges occurring as the Lagrangean parameters. Due to the presence of gauge invariances we show that for the enlarged NH symmetries quasicovariant dynamics reduces to the one following from standard NH symmetries, with one central charge in arbitrary dimension D and with second exotic central charge in D=2+1.
description: 13 pages, Latex
A fully automated method for 3D individual tooth identification and segmentation in dental CBCT
Creators: name: Jang, Tae Jun
name: Kim, Kang Cheol
name: Cho, Hyun Cheol
name: Seo, Jin Keun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Accurate and automatic segmentation of three-dimensional (3D) individual teeth from cone-beam computerized tomography (CBCT) images is a challenging problem because of the difficulty in separating an individual tooth from adjacent teeth and its surrounding alveolar bone. Thus, this paper proposes a fully automated method of identifying and segmenting 3D individual teeth from dental CBCT images. The proposed method addresses the aforementioned difficulty by developing a deep learning-based hierarchical multi-step model. First, it automatically generates upper and lower jaws panoramic images to overcome the computational complexity caused by high-dimensional data and the curse of dimensionality associated with limited training dataset. The obtained 2D panoramic images are then used to identify 2D individual teeth and capture loose- and tight- regions of interest (ROIs) of 3D individual teeth. Finally, accurate 3D individual tooth segmentation is achieved using both loose and tight ROIs. Experimental results showed that the proposed method achieved an F1-score of 93.35% for tooth identification and a Dice similarity coefficient of 94.79% for individual 3D tooth segmentation. The results demonstrate that the proposed method provides an effective clinical and practical framework for digital dentistry.
ANALISIS FAKTOR KESULITAN MAHASISWA MATEMATIKA MEMBUKTIKAN TEOREMA
Creators: name: Irwansyah, Budi
Publisher: name: figshare
Year: 2021
Subjects: subject: 10401 Applied Statistics
subject: FOS: Mathematics
subject: 10111 Real and Complex Functions (incl. Several Variables)
subject: 10107 Mathematical Logic, Set Theory, Lattices and Universal Algebra
subject: Algebra
subject: 10101 Algebra and Number Theory

description: Bukti adalah serangkaian argumen logis yang menjelaskan kebenaran suatu pernyataan. Logis berarti semua langkah pada setiap argumen harus dijustifikasi oleh langkah sebelumnya. Dalam matematika, teorema merupakan pernyataan dalam bahasa formal yang dapat diturunkan dengan mengaplikasikan aturan inferensi dan aksioma dari sebuah sistem deduktif. Banyak faktor yang dapat menyebabkan mahasiswa matematika sulit membuktikan sebuah teorema; diantaranya adalah mahasiswa tidak mengetahui definisi, mahasiswa tidak mampu menggunakan bahasa dan notasi matematika, ataupun mahasiswa tidak tahu bagaimana cara memulai bukti. Pada tulisan sederhana ini dibahas sekilas mengenai salah satu aplikasi teknik statistik multivariat, yaitu analisis faktor yang berguna untuk mengetahui faktor-faktor apa saja yang menyebabkan mahasiswa kesulitan dalam membuktikan teorema, khususnya pada mata kuliah struktur aljabar.
Measuring functional renormalization group fixed-point functions for pinned manifolds
Creators: name: Middleton, A. Alan
name: Doussal, Pierre Le
name: Wiese, Kay Joerg
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Exact numerical minimization of interface energies is used to test the functional renormalization group (FRG) analysis for interfaces pinned by quenched disorder. The fixed-point function R(u) (the correlator of the coarse-grained disorder) is computed. In dimensions D=d+1, a linear cusp in R''(u) is confirmed for random bond (d=1,2,3), random field (d=0,2,3), and periodic (d=2,3) disorders. The functional shocks that lead to this cusp are seen. Small, but significant, deviations from 1-loop FRG results are compared to 2-loop corrections. The cross-correlation for two copies of disorder is compared with a recent FRG study of chaos.
description: 4 pages, 4 figures
Charges in Gauge Theories
Creators: name: McMullan, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recent progress in the construction of both electric, coloured and magnetic charges in gauge theories will be presented. The topological properties of the charged sectors will be highlighted as well as the applications of this work to confinement and infrared dynamics.
description: This is a contribution to the Proc. of the O'Raifeartaigh Symposium on Non-Perturbative and Symmetry Methods in Field Theory (June 2006, Budapest, Hungary), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
Persistence and survival in equilibrium step fluctuations
Creators: name: Constantin, M.
name: Dasgupta, C.
name: Sarma, S. Das
name: Dougherty, D. B.
name: Williams, E. D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Results of analytic and numerical investigations of first-passage properties of equilibrium fluctuations of monatomic steps on a vicinal surface are reviewed. Both temporal and spatial persistence and survival probabilities, as well as the probability of persistent large deviations are considered. Results of experiments in which dynamical scanning tunneling microscopy is used to evaluate these first-passage properties for steps with different microscopic mechanisms of mass transport are also presented and interpreted in terms of theoretical predictions for appropriate models. Effects of discrete sampling, finite system size and finite observation time, which are important in understanding the results of experiments and simulations, are discussed.
description: 30 pages, 12 figures, review paper for a special issue of JSTAT
Sensitivity of helioseismic gravity modes to the dynamics of the solar core
Creators: name: Mathur, S.
name: Eff-Darwich, A.
name: García, R. A.
name: Turck-Chièze, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The dynamics of the solar core cannot be properly constrained through the analysis of acoustic oscillation modes. Gravity modes are necessary to understand the structure and dynamics of the deepest layers of the Sun. Through recent progresses on the observation of these modes -- both individually and collectively -- new information could be available to contribute to inferring the rotation profile down inside the nuclear burning core. To see the sensitivity of gravity modes to the rotation of the solar core. We analyze the influence of adding the splitting of one and several g modes to the data sets used in helioseismic numerical inversions. We look for constraints on the uncertainties required in the observations in order to improve the derived core rotation profile. We compute forward problems obtaining three artificial sets of splittings derived for three rotation profiles: a rigid profile taken as a reference, a step-like and a smoother profiles with higher rates in the core. We compute inversions based on Regularized Least-Squares methodology (RLS) for both artificial data with real error bars and real data. Several sets of data are used: first we invert only p modes, then we add one and several g modes to which different values of observational uncertainties (75 and 7.5 nHz) are attributed. For the real data, we include g-mode candidate, l=2, n=-3 with several splittings and associated uncertainties. We show that the introduction of one g mode in artificial data improves the rate in the solar core and give an idea on the tendency of the rotation profile. The addition of more g modes gives more accuracy to the inversions and stabilize them. The inversion of real data with the g-mode candidate gives a rotation profile that remains unchanged down to 0.2 R, whatever value of splitting we attribute to the g mode.
description: Accepted for publication in A&A, 8 pages, 11 figures
Fannie Mae's National Housing Survey Monthly Home Purchase Sentiment Index (HPSI) and Key Indicators - April, 2019 (a subset of the complete monthly Fannie Mae National Housing Survey)
Creators: name: Foundation, Fannie Mae
Publisher: name: Roper Center for Public Opinion Research
Year: 2019

description: Economy on right/wrong track (1); personal financial situation (1); good/bad time to buy a house (1); good/bad time to sell a house (1); home price changes (3); rental price changes (3); mortgage interest rate changes (1); ability to obtain a home mortgage today (1); current homeownership status (1); renting vs. buying a home in the future (1); concern about unemployment (1); change in income (1).