cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Cosmological consequences of a principle of finite amplitudes
Creators: name: Jonas, Caroline
name: Lehners, Jean-Luc
name: Quintin, Jerome
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: FOS: Physical sciences

description: Over 30 years ago, Barrow & Tipler proposed the principle according to which the action integrated over the entire 4-manifold describing the universe should be finite. Here we explore the cosmological consequences of a related criterion, namely that semi-classical transition amplitudes from the early universe up to current field values should be well defined. On a classical level, our criterion is weaker than the Barrow-Tipler principle, but it has the advantage of being sensitive to quantum effects. We find significant consequences for early universe models, in particular: eternal inflation and strictly cyclic universes are ruled out. Within general relativity, the first phase of evolution cannot be inflationary, and it can be ekpyrotic only if the scalar field potential is trustworthy over an infinite field range. Quadratic gravity eliminates all non-accelerating backgrounds near a putative big bang (thus imposing favourable initial conditions for inflation), while the expected infinite series of higher-curvature quantum corrections eliminates Lorentzian big bang spacetimes altogether. The scenarios that work best with the principle of finite amplitudes are the no-boundary proposal, which gives finite amplitudes in all dynamical theories that we have studied, and string-inspired loitering phases. We also comment on the relationship of our proposal to the swampland conjectures.
description: 50 pages, 3 figures, 1 table. Matches the published version
Modification of the rho meson detected by low-mass electron-positron pairs in central Pb-Au collisions at 158 A GeV/c
Creators: name: CERES Collaboration
name: Adamova, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present a measurement of $e^+e^-$ pair production in central Pb-Au collisions at 158$A$ GeV/$c$. As reported earlier, a significant excess of the $e^+e^-$ pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgraded CERES experiment at the CERN-SPS, allows for a comparison of the data with different theoretical approaches. The data clearly favor a substantial in-medium broadening of the $ρ$ spectral function over a density-dependent shift of the $ρ$ pole mass. The in-medium broadening model implies that baryon induced interactions are the key mechanism to in-medium modifications of the $ρ$-meson in the hot fireball at SPS energy.
description: Revised version
A model for cage formation in colloidal suspension of laponite
Creators: name: Joshi, Yogesh M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In this paper we investigate glass transition in aqueous suspension of synthetic hectorite clay, laponite. We believe that upon dispersing laponite clay in water, system comprises of clusters (agglomerates) of laponite dispersed in the same. Subsequent osmotic swelling of these clusters leads to increase in their volume fraction. We propose that this phenomenon is responsible for slowing down of the overall dynamics of the system. As clusters fill up the space, system undergoes glass transition. Along with the mode coupling theory, proposed mechanism rightly captures various characteristic features of the system in the ergodic regime as it approaches glass transition.
description: 12 pages, 1 figures. The Journal of Chemical Physics, in press
Cosmological Magnetogenesis: The Biermann Battery during the Epoch of Reionization
Creators: name: Attia, Omar
name: Teyssier, Romain
name: Katz, Harley
name: Kimm, Taysun
name: Martin-Alvarez, Sergio
name: Ocvirk, Pierre
name: Rosdahl, Joakim
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the effect of the Biermann battery during the Epoch of Reionization (EoR) using cosmological Adaptive Mesh Refinement simulations within the framework of the SPHINX project. We develop a novel numerical technique to solve for the Biermann battery term in the Constrained Transport method, preserving both the zero divergence of the magnetic field and the absence of Biermann battery for isothermal flows. The structure-preserving nature of our numerical method turns out to be very important to minimise numerical errors during validation tests of the propagation of a Strömgren sphere and of a Sedov blast wave. We then use this new method to model the evolution of a 2.5 and 5 co-moving Mpc cosmological box with a state-of-the-art galaxy formation model within the RAMSES code. Contrary to previous findings, we show that three different Biermann battery channels emerge: the first one is associated with linear perturbations before the EoR, the second one is the classical Biermann battery associated with reionization fronts during the EoR, and the third one is associated with strong, supernova-driven outflows. While the two former channels generate spontaneously volume-filling magnetic fields with a strength on the order or below $10^{-20}$ G, the latter, owing to the higher plasma temperature and a marginally-resolved turbulent dynamo, reaches a field strength as high as $10^{-18}$ G in the intergalactic medium around massive haloes.
description: 14 pages, 18 figures, accepted in MNRAS
Frustration enhanced by Kitaev exchange in a $\boldsymbol{\tilde{j}_{\text{eff}}=\frac12}$ triangular antiferromagnet
Creators: name: Wellm, C.
name: Roscher, W.
name: Zeisner, J.
name: Alfonsov, A.
name: Zhong, R.
name: Cava, R. J.
name: Savoyant, A.
name: Hayn, R.
name: Brink, J. van den
name: Büchner, B.
name: Janson, O.
name: Kataev, V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Triangular Heisenberg antiferromagnets are prototypes of geometric frustration, even if for nearest-neighbor interactions quantum fluctuations are not usually strong enough to destroy magnetic ordering: stronger frustration is required to stabilize a spin-liquid phase. On the basis of static magnetization and electron spin resonance measurements, we demonstrate the emergence of ${\tilde{j}_{\text{eff}}=\frac12}$ moments in the triangular-lattice magnet Na$_2$BaCo(PO$_4$)$_2$. These moments are subject to an extra source of frustration that causes magnetic correlations to set in far above both the magnetic ordering and Weiss temperatures. Corroborating the $\tilde{j}_{\text{eff}}=\frac12$ ground state, theory identifies ferromagnetic Kitaev exchange anisotropy as additional frustrating agent, altogether putting forward Na$_2$BaCo(PO$_4$)$_2$ as a promising Kitaev spin-liquid material.
description: 6 pages, 4 figures (published version) + supplemental material (4 pages)
Μέθοδοι διανυσματικής κβάντισης νευρωνικών δικτύων
Creators: name: Φλωρόπουλος, Νικολαος Συμεών
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Νευρωνικά Δίκτυα
Βαθιά Μάθηση
Διανυσματική Κβάντιση
Neural Networks
Deep Learning
Vector Quantization

description: Στην παρούσα διπλωματική εργασία εξετάζουμε κατά πόσο τεχνικές διανυσματικής κβάντισης επηρεάζουν τις επιδόσεις νευρωνικών δικτύων. Αρχικά εστιάζουμε στην κβάντιση των ενεργοποιήσεων των νευρώνων και στην συνέχεια εξετάζουμε την πλήρη κβάντιση παραμέτρων και ενεργοποιήσεων βασιζόμενοι σε πρωθύστερες εργασίες που εστίαζαν στην κβάντιση των βαρών. Χρησιμοποιώντας κβάντιση γινόμενο εξετάζουμε τις επιδόσεις πλήρη κβαντισμένων δικτύων, όπου ο βαθμός συμπίεσης είναι υψηλότερος από τη δυαδική κβάντιση. Τέλος περιγράφουμε τους περιορισμούς εφαρμογής αυτής της μεθόδου και σκιαγραφούμε διάφορες θεωρητικές προσεγγίσεις σχετικές με την προσπάθεια επιτάχυνσης των πλήρη κβαντισμένων δικτύων κατά την εκτέλεση τους.
description: In this master thesis we explore the eﬀects of vector quantization on the performance of multilayer neural networks. We begin by examining the eﬀects of the quantization of the activations of the neural networks, and then we expand our investigation by combining it with earlier work, which focused on weight quantization. By using product quantization we examine the performance of fully quantizaed neural networks, which achieve compression rates higher than binarization. Finally we highlight some limitation of this approach and discuss possible approaches for accelerating the fully quantized networks during inference.
Cogitative Intervention In Societal Thinking
Creators: name: Sotirios (Sam) Karras
Publisher: name: figshare
Year: 2021
Subjects: subject: 160806 Social Theory
subject: FOS: Sociology
subject: 160899 Sociology not elsewhere classified
subject: 160104 Social and Cultural Anthropology
subject: 169999 Studies in Human Society not elsewhere classified

description: People’s inquiries would be developed at best when exercised in a tripartite format -that is, problematizations, analyzations, systemizations- should the inquiry process be integrated. When this is missed, inquiries, and related findings, are not to be considered as complete. It is the simple human inquiry, which lies in the human nature, that gives rise to social systems. Individual profession, organizational clan, and societal culture consist the core levels and the inevitable units of a social system while direct the following seven key deductions: (1) human inquiry results in social formation including the social levels of individual, organizations, and societies as we know them today; (2) human evolves to individual, a core unit regarding social formations; (3) the role of culture; (4) where the effect of perception lies and why; (5) individual perceiving would not progress to societal processing unless organizational pursuing would be in place; (6) why societies should only process, not pursue, nor perceive for their citizens; (7) the perceptions, the pursuits and the processes in a social system are initially triggered and further evolve by the humans’ problematization, analyzation, and systemization forms of inquiry.
Οι επιδράσεις της Ορθόδοξης Θεολογίας κατά τον 20ο αιώνα στην Χριστιανική αγωγή
Creators: name: Κεχαγιάς, Γεώργιος Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Χριστιανική αγωγή
Ορθόδοξοι Πατέρες του 20ου αιώνα
Αγ. Νικόλαος Βελιμίροβιτς
Christian education
Church Fathers of 20th century
St Nikolai Velimirovich

description: Σκοπός της διπλωματικής εργασίας ήταν η διερεύνηση των επιδράσεων που είχε η Ορθόδοξος Θεολογία κατά τον 20ο αιώνα στην Χριστιανική αγωγή, και πιο συγκεκριμένα η συμβολή της Ορθόδοξης Θεολογίας του 20ου αιώνα στην Χριστιανική αγωγή. Η εργασία αρχίζει με το εισαγωγικό κεφάλαιο στο οποίο γίνεται αναφορά στην αφόρμηση για την συγγραφή, στους ορισμούς, στο πλαίσιο της έρευνας και στην βασική δομή. Ακολουθεί ένα κεφάλαιο όπου παρουσιάζονται οι προϋποθέσεις εξέτασης του διερευνόμενου θεολογικού πλαισίου του 20ου αιώνα για την Χριστιανική αγωγή. Στην συνέχεια ακολουθούν τα κεφάλαια της εργασίας που παραθέτουν τις θέσεις της Ορθόδοξης Θεολογίας, όπως αυτές διατυπώθηκαν κατά τον 20ο αιώνα, σχετικά με τον ρόλο που θα πρέπει να έχουν οι δάσκαλοι και η εκπαίδευση στην Χριστιανική αγωγή, αλλά και τον ρόλο που χρειάζεται να έχουν οι γονείς, ούτως ώστε να καταστεί δυνατή η επίτευξη της αγωγής αυτής. Το επόμενο κεφάλαιο καταπιάνεται με ανεξάρτητα μεταξύ τους θέματα της Χριστιανικής αγωγής, αφ’ ενός με το πρόταγμα της «επαναστατικής παιδαγωγικής» που έθεσε ο άγιος Νικόλαος Βελιμίροβιτς (ως ολοκληρωμένη απάντηση στα παντοειδή ιδεολογικά αιτήματα του 20ου αιώνα) και αφ’ ετέρου με τη θαρραλέα εξέταση της ανθρωπιστικής παιδείας από τον άγιο Ιουστίνο Πόποβιτς. Το τελευταίο κεφάλαιο αποτελείται από τα σύντομα συμπεράσματα της εργασίας. Ακολουθεί η βιβλιογραφία και η παράθεση των χρησιμοποιηθέντων πηγών και βοηθημάτων
description: The aim of the present thesis was to investigate the impacts of Orthodox Theology in the 20th century on the Christian education, and in particular the contribution of Orthodox Theology of the 20th century to Christian education. The work begins with the introductory chapter which refers to the starting point for the thesis, the definitions of significant words, the research framework, and the basic structure. A chapter follows, presenting the conditions for examining the 20th-century theological context under investigation in relevance with Christian education. The next chapters of the work outline the positions of Orthodox Theology, as they were formulated in the 20th century, on the role of teachers and school in Christian education, as well as the role that parents, need to have so that this education can be achieved. The following chapter deals with independent issues of Christian education, on the one hand with the project of "revolutionary pedagogy" set by St. Nicholas Velimirovic (as a complete answer to all kinds of ideological demands of the 20th century) and, on the other hand, with the courageous examination of humanist education by St. Justin Popovic. The last chapter consists of the brief conclusions of the work. At the end is the bibliography and the citation of the used sources and aids
Measurement and QCD Analysis of the Diffractive Deep-Inelastic Scattering Cross Section at HERA
Creators: name: H1 Collaboration
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A detailed analysis is presented of the diffractive deep-inelastic scattering process $ep\to eXY$, where $Y$ is a proton or a low mass proton excitation carrying a fraction $1 - \xpom > 0.95$ of the incident proton longitudinal momentum and the squared four-momentum transfer at the proton vertex satisfies $|t|<1 {\rm GeV^2}$. Using data taken by the H1 experiment, the cross section is measured for photon virtualities in the range $3.5 \leq Q^2 \leq 1600 \rm GeV^2$, triple differentially in $\xpom$, $Q^2$ and $β= x / \xpom$, where $x$ is the Bjorken scaling variable. At low $\xpom$, the data are consistent with a factorisable $\xpom$ dependence, which can be described by the exchange of an effective pomeron trajectory with intercept $\alphapom(0)= 1.118 \pm 0.008 {\rm (exp.)} ^{+0.029}_{-0.010} {\rm (model)}$. Diffractive parton distribution functions and their uncertainties are determined from a next-to-leading order DGLAP QCD analysis of the $Q^2$ and $β$ dependences of the cross section. The resulting gluon distribution carries an integrated fraction of around 70% of the exchanged momentum in the $Q^2$ range studied. Total and differential cross sections are also measured for the diffractive charged current process $e^+ p \to \barν_e XY$ and are found to be well described by predictions based on the diffractive parton distributions. The ratio of the diffractive to the inclusive neutral current $ep$ cross sections is studied. Over most of the kinematic range, this ratio shows no significant dependence on $Q^2$ at fixed $\xpom$ and $x$ or on $x$ at fixed $Q^2$ and $β$.
description: 59 pages, 19 figures, 6 tables
Semi-supervised learning combining backpropagation and STDP: STDP enhances learning by backpropagation with a small amount of labeled data in a spiking neural network
Creators: name: Furuya, Kotaro
name: Ohkubo, Jun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: A semi-supervised learning method for spiking neural networks is proposed. The proposed method consists of supervised learning by backpropagation and subsequent unsupervised learning by spike-timing-dependent plasticity (STDP), which is a biologically plausible learning rule. Numerical experiments show that the proposed method improves the accuracy without additional labeling when a small amount of labeled data is used. This feature has not been achieved by existing semi-supervised learning methods of discriminative models. It is possible to implement the proposed learning method for event-driven systems. Hence, it would be highly efficient in real-time problems if it were implemented on neuromorphic hardware. The results suggest that STDP plays an important role other than self-organization when applied after supervised learning, which differs from the previous method of using STDP as pre-training interpreted as self-organization.
description: 9 pages, 12 figures
Spatial distribution of interstellar gas in the innermost 3 kpc of our Galaxy
Creators: name: Ferriere, Katia
name: Gillard, William
name: Jean, Pierre
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We review the present observational knowledge on the spatial distribution and the physical state of the different (molecular, atomic and ionized) components of the interstellar gas in the innermost 3 kpc of our Galaxy -- a region which we refer to as the interstellar Galactic bulge, to distinguish it from its stellar counterpart. We try to interpret the observations in the framework of recent dynamical models of interstellar gas flows in the gravitational potential of a barred galaxy. Finally, relying on both the relevant observations and their theoretical interpretation, we propose a model for the space-averaged density of each component of the interstellar gas in the interstellar Galactic bulge.
description: 19 pages, 11 figures
Σύγκριση ισορροπίας μεταξύ ενήλικων ανδρών με και χωρίς νοητική αναπηρία
Creators: name: Τσιαβδάρη, Μαρία Πέτρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Νοητική Αναπηρία
Ισορροπία
Συνδυαστικές ασκήσεις
Intellectual Disability
Balance
Dual - Task

description: Σκοπός της συγκεκριμένης μελέτης ήταν η σύγκριση της ικανότητας ισορροπίας ανάμεσα σε ενήλικες άνδρες με και χωρίς νοητική αναπηρία. Το δείγμα της μελέτης απετέλεσαν 28 ενήλικες αθλητές της πετοσφαίρισης και όλοι τους είχαν παρόμοια φυσική κατάσταση, ενώ η μέση ηλικία των συμμετεχόντων ήταν 26±5.8 έτη. Από αυτούς, οι 14 ήταν αθλητές με τυπικό δείκτη νοημοσύνης και οι 14 ήταν αθλητές με νοητική αναπηρία. Τα άτομα του δείγματος έχουν χαρακτηριστεί ως άτομα με μέτρια Νοητική Αναπηρία ( ΜΟ ΔΝ=45±10) σύμφωνα με την αξιολόγηση των ΚΕΔΔΥ με το Wisk test. Η σύγκριση της ισορροπίας έγινε σε τρεις (3) ελεύθερες μετρήσεις ισορροπίας και μια μέτρηση με ταυτόχρονη διαταραχή της ισορροπίας με μία μπάλα της πετοσφαίριση (Dual-Task). Τα αποτελέσματα έδειξαν ότι δεν υπάρχουν σημαντικά στατιστικές διαφορές ανάμεσα στους συμμετέχοντες, γεγονός που αποδίδεται στην ενασχόληση τους με αθλητικές δραστηριότητες αποδεικνύοντας ότι η φυσική κατάσταση των ατόμων με νοητική αναπηρία και κυρίως η ισορροπία τους μπορεί να βελτιωθεί όταν αθλούνται
description: The purpose of this study was to compare the balance ability among adult men with and without intellectual disabilities. Our sample was consisted of 28 volleyball athletes with similar fitness and typical IQ. Their mean age was = 26 ± 5.8 years. From them, the 14 were athletes with formal indicator of intelligence and the 14 were athletes with intellectual infirmity. The individuals of sample have been characterized as individuals with mediocre Intellectual Infirmity (MO DN=45±10) according to the evaluation of KEDDY with Wisk test. The comparison of balance became in three (3) free measurements of balance and a measurement with simultaneous disturbance of balance with volleyball (Dual-Task). The results showed that there are no significant statistical differences between the participants, which is attributed to their athletic activities, proving that the physical condition of people with intellectual disabilities, especially their balance, can be improved when they are sporting
Molecular analysis of the domains in CD45 that affect expression and function
Creators: name: Maiti, Arpita
Publisher: name: University of British Columbia
Year: 2009

description: The aim of this thesis was to further understand the molecular function of CD45, a transmembrane glycoprotein that has intrinsic tyrosine phosphatase activity. Expression of two isoforms of CD45, CD45RABC and CD45RO, and two mutated forms of CD45, one lacking protein tyrosine phosphatase (FTP) activity, and one lacking the cytoplasmic domain, were analyzed in a fibroblast cell line, L tk-. It was observed that only a proportion (10-30%) of CD45 expressed in all transfected cells was expressed on the surface. Deletion of the cytoplasmic tail of CD45 resulted in the expression of two CD45 proteins of 125 kDa and 160 kDa. From pulse-chase experiments, it was determined that the higher molecular weight form was derived from the lower molecular weight form. Mutational analysis of the of the cytoplasmic domain of CD45 indicated that a conserved glutamine in the second PTP domain of CD45, expressed in E. coli, resulted in the loss of CD45 PTP activity. This demonstrates that a mutation in domain II can affect FTP activity thought to reside in domain I. In order to determine the effect of mutations in CD45 on T cell signalling, it was first necessary to characterize a CD45-deficient T cell line. The BW5147 CD45-negative cell line was characterized with respect to p59fyn, a potential in vivo substrate for CD45. It was determined that the expression of CD45 resulted in the reduced tyrosine phosphorylation of p59fyn, yet CD45 had no appreciable effect on the in vitro kinase activity of p59fyn. However, a 120/130 kDa phosphoprotein was identified only in p59fyn immunoprecipitates from CD45-positive cells after an in vitro kinase assay and this occurred independent of T cell receptor mediated stimulation. These results implicate CD45 in regulating the associations of p59fyn in addition to regulating its tyrosine phosphorylation state.
Charge Fluctuations along the QCD phase boundary
Creators: name: Redlich, K.
name: Friman, B.
name: Sasaki, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss the properties of the net--quark and isovector fluctuations along the chiral phase transition line in the plane spanned by temperature and baryon chemical potential. Our results are obtained in terms of the Nambu--Jona-Lasinio (NJL) model within the mean-field approximation. The model is formulated at the finite temperature and for non-vanishing net--quark and the isospin chemical potentials. The fermion interactions are controlled by the strength of the scalar and vector couplings in the iso-scalar and iso-vector channels of constituent quarks. We explore properties and differences in the behavior of the net--quark number and isovector susceptibilities for different values of thermal parameters near the phase transition. We argue that any non-monotonic behavior of the net--quark number susceptibility along the phase transition boundary is an excellent probe of the existence and the position of the second order endpoint in the QCD phase diagram.
description: 8 pages, 4 figures, to appear in the proceedings of International Conference on Strangeness in Quark Matter (SQM2006), Los Angeles, California, 26-31 Mar 2006
Force, quantum mechanics and approximate energy eigenstates
Creators: name: Das, C.
name: Bhattacharyya, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The prevalent role of force in traditional quantum mechanics is outlined, with special reference to approximate calculations for stationary states. It will be explored how far this force concept can be made useful in the concerned area. The basic idea is to differentiate the Schroedinger stationary equation once. Thus, one can eliminate the unknown energy as well, and then examine how a force-based approach can be beneficial in providing quickly the nodal information and in assessing the quality of an approximate function. Further, it will be demonstrated how the minimization of a suitable quantity derived from force may constitute a variational principle for bound states. The strategy applies also to Siegert states where traditional energy extremization principle ceases to work. Additionally, the utility of the force concept in semiclassical mechanics will be investigated.
Likelihood methods for the combined analysis of CMB temperature and polarisation power spectra
Creators: name: Percival, Will J.
name: Brown, Michael L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the shape of the likelihood and posterior surfaces to be used when fitting cosmological models to CMB temperature and polarisation power spectra measured from experiments. In the limit of an all-sky survey with Gaussian distributed pixel noise we show that the true combined likelihood of the four CMB power spectra (TT, TE, EE & BB) has a Wishart distribution and we discuss the properties of this function. We compare various fits to the posterior surface of the Cls, both in the case of a single auto-power spectrum and for a combination of temperature and polarisation data. In the latter case, it is important that the fits can accurately match the Wishart distribution in the limit of near full-sky coverage. Simple extensions of auto-power spectrum fits to include polarisation data generally fail to match correlations between the different power spectra in this limit. Directly fitting pixel values on large scales, as undertaken by the WMAP team in their analysis of the 3 year data, avoids the complications of characterising the shape of the posterior for the power spectra. Finally we demonstrate the importance of the likelihood distribution on analytic marginalisation, and provide a formula for analytic marginalisation over a calibration error given an all-sky survey.
description: 12 pages, 2 figures. Revised version, accepted for publication in MNRAS
The high momentum behavior of a quark wake
Creators: name: Yarom, Amos
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using the AdS/CFT duality, we analytically evaluate the high momentum (or short distance) behavior of the color field strength due to a moving quark in an N=4 SYM plasma. We find a fireball-like behavior in the near quark vicinity as predicted in the literature on general grounds, in the context of heavy ion collisions. Our approach to analytically solving the problem is based on a WKB approximation which may be extended to other setups as well.
description: 24 pages, 3 figures; Typos corrected, references added
The myth of "political memoir": a feminist critique
Creators: name: Mason, Mason
Publisher: name: University of British Columbia
Year: 2009

description: This thesis examines the relationship between power and knowledge in the maintenance of a separate category of historical literature labelled “political memoir.” It adopts a feminist definition of “political” and thereby challenges the fundamental dichotomy between personal and political upon which such a categorization depends. Feminist literary analysis is used to read the personal narratives of two women whose experiences would not normally qualify as “political,” and two men whose experiences as diplomats place them firmly within the tradition of “political memoir” writing. The goal of such an analysis is to demonstrate both the myriad ways in which personal experience is political and the political implications of all personal writings. In this way, the thesis “deconstructs” the concept of political memoir and reaffirms the need for a fundamental restructuring of the categories into which historical analysis has been divided.
Hybrid protoneutron stars within a static approach
Creators: name: Nicotra, O. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the hadron-quark phase transition in the interior of protoneutron stars. For the hadronic sector, we use a microscopic equation of state involving nucleons and hyperons derived within the finite-temperature Brueckner-Bethe-Goldstone many-body theory, with realistic two-body and three-body forces. For the description of quark matter, we employ the MIT bag model both with a constant and a density-dependent bag parameter. We calculate the structure of protostars within a static approach. In particular we focus on a suitable temperature profile, suggested by dynamical calculations, which plays a fundamental role in determining the value of the minimum gravitational mass. The maximum mass instead depends only upon the equation of state employed.
description: 5 pages, 3 figures, Prepared for XI Convegno su Problemi di Fisica Nucleare Teorica (Cortona 2006), Cortona, Italy, 11-14 Oct 2006
The Gravitational-Wave Physics II: Progress
Creators: name: Bian, Ligong
name: Cai, Rong-Gen
name: Cao, Shuo
name: Cao, Zhoujian
name: Gao, He
name: Guo, Zong-Kuan
name: Lee, Kejia
name: Li, Di
name: Liu, Jing
name: Lu, Youjun
name: Pi, Shi
name: Wang, Jian-Min
name: Wang, Shao-Jiang
name: Wang, Yan
name: Yang, Tao
name: Yang, Xing-Yu
name: Yu, Shenghua
name: Zhang, Xin
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: It has been a half-decade since the first direct detection of gravitational waves, which signifies the coming of the era of the gravitational-wave astronomy and gravitational-wave cosmology. The increasing number of the detected gravitational-wave events has revealed the promising capability of constraining various aspects of cosmology, astronomy, and gravity. Due to the limited space in this review article, we will briefly summarize the recent progress over the past five years, but with a special focus on some of our own work for the Key Project ``Physics associated with the gravitational waves'' supported by the National Natural Science Foundation of China. In particular, (1) we have presented the mechanism of the gravitational-wave production during some physical processes of the early Universe, such as inflation, preheating and phase transition, and the cosmological implications of gravitational-wave measurements; (2) we have put constraints on the neutron star maximum mass according to GW170817 observations; (3) we have developed a numerical relativity algorithm based on the finite element method and a waveform model for the binary black hole coalescence along an eccentric orbit.
description: v1, 93 pages, 18 figures, prepared as a status review of project report for Sci. China Phys. Mech. Astron.; v2, 95 pages, minor revision, references added, accepted for publication in Sci. China Phys. Mech. Astron; v3, to match the published version
Χαρακτηρισμός βέλτιστων πειραματικών σχεδιασμών μέσω Αλγεβρικής Στατιστικής
Creators: name: Τζιούφας, Βασίλειος Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Κορεσμένοι Πειραματικοί Σχεδιασμοί
D – Βέλτιστοι Σχεδιασμοί
Βάσεις Groebner

description: Στην παρούσα διπλωματική εργασία, κατασκευάζονται D – βέλτιστοι κορεσμένοι παραγοντικοί σχεδιασμοί, για την εκτίμηση του γενικού μέσου, των κύριων επιδράσεων και όταν είναι εφικτό των αλληλεπιδράσεων 2ης και ανώτερης τάξης. Βασικό εργαλείο για την κατασκευή των παραπάνω σχεδιασμών είναι οι βάσεις Graver και Groebner, οι οποίες χρησιμοποιήθηκαν για πρώτη φορά για αυτά τα θέματα από τους Fontana, Rapallo και Rogantin (2013), στην εργασία τους “A Characterization of Saturated Designs for Factorial Experiments”. Με τη βοήθεια των βάσεων Graver και Groebner προκύπτουν οι διαδρομές (circuits), οι οποίες είναι χρήσιμες στην εύρεση των κορεσμένων σχεδιασμών και των D – βέλτιστων κορεσμένων σχεδιασμών. Χρησιμοποιώντας το θεωρητικό υπόβαθρο των παραπάνω εργαλείων και αναπτύσσοντας αλγοριθμικές τεχνικές στα λογισμικά Macaulay2 και R κατασκευάστηκαν οι D – βέλτιστοι κορεσμένοι σχεδιασμοί 2×2×2×2 για την εκτίμηση 11 παραμέτρων, 2×3×4 για την εκτίμηση 18 παραμέτρων, 2×2×2×3 για την εκτίμηση 22 παραμέτρων, 2×2×3×3 για την εκτίμηση 32 παραμέτρων και 3×3×3 για την εκτίμηση 19 παραμέτρων.
description: In this thesis, D – optimal saturated factorial designs are constructed, for estimation of the general mean, main effects and if it is feasible two – way and higher order interactions. The main tool for the construction of these designs is the Graver and Groebner bases, used for these problems first by Fontana, Rapallo and Rogantin (2013), in their paper “A Characterization of Saturated Designs for Factorial Experiments”. Using Graver and Groebner bases, circuits are obtained, which are useful for finding saturated designs and D – optimal saturated designs. Using these tools and the software of Macaulay2 and R, D – optimal saturated designs are constructed. The special cases studied are, 2×2×2×2 for the estimation of 11 parameters, 2×3×4 for the estimation of 18 parameters, 2×2×2×3 for the estimation of 22 parameters, 2×2×3×3 for the estimation of 32 parameters and 3×3×3 for the estimation of 19 parameters.
Pole Approximation for the pion eletromagnetic form factor within light-front dynamics
Creators: name: de Melo, J. P. B. C.
name: Veiga, J. S.
name: Frederico, T.
name: Pace, E.
name: Salme, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We carefully investigate the reliability of the propagator Pole Approximation, i.e, the approximation of retaining only the propagator in the evaluation of the Mandelstam covariant expression for the eletromagnetic current of the pion. Different frames are analyzed, in order to find the most suitable one for calculating the pion form factor within the proposed approximation. It turns out that approximation is more accurate in the frame where q^+ is maximal. The relevance of the Pole Approximation is briefly discussed in view of calculations of hadrons factors basead wave functions generate by dynamical models.
description: Talk given in the "Continuous Advances in QCD 2006", May 11-14, 2006 Minneapolis, University of Minnesota, Minnesota, USA. To appear in the proceedings. Use wspc style, 3 eps figues, 7 pages
[Miscellaneous annotated published texts]
Creators: name: Matisoff, James
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2024
Subjects: subject: lit

description: Annotated photocopies of excerpts from an issue of Draugas newspaper, a children's book called "Gulbė Karaliaus Pati" (Swan, the King's Wife) by Viktoras Petravičius, and an unidentified history book.
Twist and teleportation analogy of the black hole final state
Creators: name: Ahn, Doyeol
name: Kim, M. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Mathematical connection between the quantum teleportation, the most unique feature of quantum information processing, and the black hole final state is studied taking into account the non trivial spacetime geometry. We use the twist operatation for the generalized entanglement measurement and the final state boundary conditions to obtain transfer theorems for the black hole evaporation. This would enable us to put together the universal quantum teleportation and the black hole evaporation in the unified mathematical footing. For a renormalized post selected final state of outgoing Hawking radiation, we found that the measure of mixedness is preserved only in the special case of final-state boundary condition in the micro-canonical form, which resmebles perfect teleportation channel.
description: version_2
Additional file 1 of Older working adults in the HEAF study are more likely to report loneliness after two years of follow-up if they have negative perceptions of their work quality
Creators: name: Bevilacqua, Gregorio
name: D’Angelo, Stefania
name: Ntani, Georgia
name: Syddall, Holly Emma
name: Harris, Elizabeth Clare
name: Linaker, Cathy
name: Stevens, Martin
name: Cooper, Cyrus
name: Walker-Bone, Karen
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Mental Health
subject: Infectious Diseases
subject: FOS: Health sciences

description: Additional file 1: Appendix 1 DAG.pdf: Directed Acyclic Graph for selection of confounders
title: Επεμβαίνοντας στο οικοδομικό τετράγωνο: "Συρραφές και πληρώσεις στον αστικό ιστό της περιοχής Αγία Τριάδα στον Βύρωνα Αττικής"
title: Intervening in the urban block: “Transformations of the urban net at the neighborhood of “Agia Triada”, Vyron, Attica”
Creators: name: Καμπουκος Κωνσταντινος
Publisher: name: Technical University of Crete
Year: 2021

description: Το αθηναϊκό οικοδομικό τετράγωνο, το οποίο αποτελεί το κύτταρο της πόλης και απαντάται σε διάφορες τυπολογίες εντός του αστικού ιστού, παρουσιάζει ενδιαφέροντα χαρακτηριστικά ως προς την πολυπλοκότητα, την μορφή, την κλίμακα και τις σχέσεις μεταξύ των χώρων του, όπως και τα κτήρια από τα οποία αυτό αποτελείται. Στην παρούσα εργασία, μέσω της ανάλυσης των συγκεκριμένων χαρακτηριστικών, επιχειρείται η ανάπλαση 6+1 οικοδομικών τετραγώνων στην περιοχή του Βύρωνα, στα ανατολικά του κέντρου της Αθήνας. Με την εν λόγω επέμβαση δίνεται έμφαση στην ενεργοποίηση κενών και μη χρησιμοποιούμενων χώρων όπως είναι οι ακάλυπτοι των υφιστάμενων κτηρίων, και στη σύνδεση τόσο μεταξύ αυτών αλλά και με τη γύρω περιοχή και ανασχεδιάζονται τα δίκτυα χρήσεων, κίνησης και στάσης (πεζών και αυτοκινήτων), με σκοπό τη βελτίωση του κτισμένου περιβάλλοντος. Η πρόταση περιλαμβάνει επίσης, τον σχεδιασμό τεσσάρων νέων κτηρίων διαμερισμάτων και ενός κτηρίου στάθμευσης οχημάτων, με συμπληρωματικές χρήσεις.
On training targets for noise-robust voice activity detection
Creators: name: Braun, Sebastian
name: Tashev, Ivan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Audio and Speech Processing (eess.AS)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The task of voice activity detection (VAD) is an often required module in various speech processing, analysis and classification tasks. While state-of-the-art neural network based VADs can achieve great results, they often exceed computational budgets and real-time operating requirements. In this work, we propose a computationally efficient real-time VAD network that achieves state-of-the-art results on several public real recording datasets. We investigate different training targets for the VAD and show that using the segmental voice-to-noise ratio (VNR) is a better and more noise-robust training target than the clean speech level based VAD. We also show that multi-target training improves the performance further.
Lattice QCD, Flavor Physics and the Unitarity Triangle Analysis
Creators: name: Lubicz, Vittorio
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Lattice QCD has always played a relevant role in the studies of flavor physics and, in particular, in the Unitarity Triangle (UT) analysis. Before the starting of the B factories, this analysis relied on the results of lattice QCD simulations to relate the experimental determinations of semileptonic B decays, K-Kbar and B_{d,s}-B_{d,s}bar mixing to the CKM parameters. In the last years much more information has been obtained from the direct determination of the UT angles from non-leptonic B decays. In this talk, after a presentation of recent averages of lattice QCD results, we compare the outcome of the "classical" UT analysis (UTlattice) with the analysis based on the angles determinations (UTangles). We discuss the role of the different determinations of Vub, and show that current data do not favour the value measured in inclusive decays. Finally we show that the recent measurement of Delta ms, combined with Delta md and epsilonK, allows a quite accurate extraction of the values of the hadronic parameters, BK, fBs*sqrt(B_Bs) and xi. These values, obtained "experimentally" by assuming the validity of the Standard Model, are compared with the theoretical predictions from lattice QCD.
description: Contribution to the proceedings of HQL06, Munich, October 16th-20th 2006. 11 pages
Integrable matrix equations related to pairs of compatible associative algebras
Creators: name: Odesskii, Alexander
name: Sokolov, Vladimir
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Representation Theory (math.RT)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 17B80, 17B63, 32L81, 14H70

description: We study associative multiplications in semi-simple associative algebras over C compatible with the usual one. An interesting class of such multiplications is related to the affine Dynkin diagrams of A, D, E-type. In this paper we investigate in details the multiplications of the A-type and integrable matrix ODEs and PDEs generated by them.
description: 12 pages, Latex
A Universal Urbach Rule for Disordered Organic Semiconductors
Creators: name: Kaiser, Christina
name: Sandberg, Oskar J.
name: Zarrabi, Nasim
name: Li, Wei
name: Meredith, Paul
name: Armin, Ardalan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: In crystalline semiconductors, absorption onset sharpness is characterized by temperature dependent Urbach energies. These energies quantify the static, structural disorder causing localized exponential-tail states, and dynamic disorder from electron-phonon scattering. Applicability of this exponential-tail model to disordered solids has been long debated. Nonetheless, exponential fittings are routinely applied to sub-gap absorption analysis of organic semiconductors. Herein, we elucidate the sub-gap spectral line-shapes of organic semiconductors and their blends by temperature-dependent quantum efficiency measurements. We find that sub-gap absorption due to singlet excitons is universally dominated by thermal broadening at low photon energies and the associated Urbach energy equals the thermal energy, regardless of static disorder. This is consistent with absorptions obtained from a convolution of Gaussian density of excitonic states weighted by Boltzmann-like thermally activated optical transitions. A simple model is presented that explains absorption line-shapes of disordered systems, and we also provide a strategy to determine the excitonic disorder energy. Our findings elaborate the meaning of the Urbach energy in molecular solids and relate the photo-physics to static disorder, crucial for optimizing organic solar cells for which we present a new radiative open-circuit voltage limit.
The Bousso entropy bound in selfgravitating gas of massless particles
Creators: name: Gersl, Jan
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Bousso entropy bound is investigated in a static spherically symmetric spacetime filled with an ideal gas of massless bosons or fermions. Especially lightsheets generated by spheres are considered. Statistical description of the gas is given. Conditions under which the Bousso bound can be violated are discussed and it is shown that a possible violating region cannot be arbitrarily large and it is contained inside a sphere of unit Planck radius if number of independent polarization states $g_s$ is small enough. It is also shown that central temperature must exceed the Planck temperature to get a violation of the Bousso bound for $g_s$ not too large.
description: 14 pages, 4 figures, a paragraph added, version published in Gen. Rel. Grav
Fractional charge and fractional statistics in the quantum Hall effects
Creators: name: Feldman, D. E.
name: Halperin, Bertrand I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Quasiparticles with fractional charge and fractional statistics are key features of the fractional quantum Hall effect. We discuss in detail the definitions of fractional charge and statistics and the ways in which these properties may be observed. In addition to theoretical foundations, we review the present status of the experiments in the area. We also discuss the notions of non-Abelian statistics and attempts to find experimental evidence for the existence of non-Abelian quasiparticles in certain quantum Hall systems.
description: Review article; references added
Phase sensitive detection of dipole radiation in a fiber-based high numerical aperture optical system
Creators: name: Vamivakas, A. N.
name: Dogan, M.
name: Ippolito, S. B.
name: Behringer, E. R.
name: Swan, A. K.
name: Goldberg, B. B.
name: Unlu, M. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We theoretically study the problem of detecting dipole radiation in an optical system of high numerical aperture in which the detector is sensitive to \textit{field amplitude}. In particular, we model the phase sensitive detector as a single-mode cylindrical optical fiber. We find that the maximum in collection efficiency of the dipole radiation does not coincide with the optimum resolution for the light gathering instrument. The calculated results are important for analyzing fiber-based confocal microscope performance in fluorescence and spectroscopic studies of single molecules and/or quantum dots.
description: 12 pages, 2 figures
Fatigue independent amplitude-frequency correlations in EMG signals
Creators: name: Siemienski, Adam
name: Kebel, Alicja
name: Klajner, Piotr
Publisher: name: arXiv
Year: 2006
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: In order to assess fatigue independent amplitude-frequency correlations in EMG signals we asked nineteen male subjects to perform a series of isometric muscular contractions by extensors of the knee joint. Different amplitudes of the signal were due to randomly varying both the joint moment and the overall amplification factor of the EMG apparatus. Mean and median frequency, RMS and mean absolute value were calculated for every combination of joint moment and amplification at the original sampling rate of 5 kHz and at several simulated lower sampling rates. Negative Spearman and Kendall amplitude-frequency correlation coefficients were found, and they were more pronounced at high sampling rates.
description: 6 pages, 6 figures, conference "Biomechanics 2006", September 6-8, 2006, Zakopane, Poland