cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Can large-scale structure probe CMB-constrained non-Gaussianity?
Creators: name: Kang, X.
name: Norberg, P.
name: Silk, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The first year Wilkinson Microwave Anisotropy Probe (WMAP) set quantitative constraints on the amplitude of any primordial non-Gaussianity. We run a series of dark matter-only N-body simulations with the WMAP constraints to investigate the effect of the presence of primordial non-Gaussianity on large scale structures. The model parameters can be constrained using the observations of protoclusters associated with Ly-$α$ emitters at high redshift ($2 \leq z \leq 4$), assuming the galaxy velocity bias can be modelled properly. High redshift structure formation potentially provides a more powerful test of possible primordial non-Gaussianity than does the CMB, albeit on smaller scales. Another constraint is given by the local galaxy density probability distribution function (PDF), as mapped by the 2 degree Field Galaxy Redshift Survey (2dFGRS). The PDF of 2dFGRS \lstar galaxies is substantially higher than the standard model predictions and requires either a non-negligible bias between galaxy and dark matter on $\sim 12$~\hmpc scales or a stronger non-Gaussianity than allowed by the WMAP year one data. The latter interpretation is preferred since second-order bias corrections are negative. With a lower normalisation of the power spectrum fluctuations, sigma_8=0.74, as favoured by the WMAP 3 year data, the discrepancy between the Gaussian model and the data is even larger.
description: 5 Pages, 5 Figures; accepted for publication in MNRAS
Positive energy theorem implies constraints on static steller models
Creators: name: Shiromizu, Tetsuya
name: Yoshino, Hirotaka
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Using the positive energy theorem, we derive some constraints on static steller models in asymptotically flat spacetimes in a general setting without imposing spherical symmetry. We show that there exist no regular solutions under certain conditions on the equation of state. As the contraposition, we obtain some constraints on the pressure and adiabatic index.
description: 7 pages, final version accepted for publication in Prog. Theore. Phys
A note on "Constraints on deep-seated zonal winds inside Jupiter and Saturn"
Creators: name: Glatzmaier, Gary A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Liu et al. 2008 discuss an important consideration for models of zonal winds deep within giant planets. However, the constraints they propose for the depth of the winds are based on their prescriptions for the internal structures of the magnetic field and zonal winds. The same kinematic analysis applied to other plausible configurations would produce no constraint on the depth to which the winds extend.
description: accepted for publication in Icarus
Efficient estimators : the use of neural networks to construct pseudo panels
Creators: name: Cottrell, Marie
name: Gaubert, Patrice
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Pseudo panels constituted with repeated cross-sections are good substitutes to true panel data. But individuals grouped in a cohort are not the same for successive periods, and it results in a measurement error and inconsistent estimators. The solution is to constitute cohorts of large numbers of individuals but as homogeneous as possible. This paper explains a new way to do this: by using a self-organizing map, whose properties are well suited to achieve these objectives. It is applied to a set of Canadian surveys, in order to estimate income elasticities for 18 consumption functions..
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Meirion Lass
Creators: name: Perks, Graeme
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Meirion Lass was built by Roger Lewis in Aberdovey as a smack in 1853 and he was the master until about 1874. In 1862 Meirion Lass need the assistance of the RNLI when it was stranded on the Aberdovey Bar in a gale but it was assisted into port unscathed. Meirion Lass was lengthened by the new owners in 1877 and became a schooner. In December 1880 the master of the Meirion Lass was lost overboard crossing the Irish sea and in October 1880 the brother of the new master Evan Morgan was lost over board on a similar crossing. He was part owner of the Meirion Lass with his father and the third and last surviving son. The Meirion Lass was sold after this and reregistered in Dublin. The Meirion Lass was trading between Britain, Ireland and the Europe until 1882 when she started trading mainly between Britain and Ireland. A Temporary change in master was made to make singe voyages to the Baltic in a number of years. In 1905 Meirion Lass is sold and moves to Bideford and starts trading in the Bristol Channel, she was converted to a Ketch and later fitted with an engine. In 1932 Merion Lass on passage from Swansea to Fethard with a cargo of coal when she springs a leak and is abandoned in the Bristol Channel. The crew is rescued by a passing steamer.
Charge-Based Compact Model for Bias-Dependent Variability of 1/f Noise in MOSFETs
Creators: name: Mavredakis, Nikolaos
name: Makris, Nikolaos
name: Habas, Predrag
name: Bucher, Matthias
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Variability of low frequency noise (LFN) in MOSFETs is bias-dependent. Moderate- to large-sized transistors commonly used in analog/RF applications show 1/f-like noise spectra, resulting from the superposition of random telegraph noise (RTN). Carrier number and mobility fluctuations are considered as the main causes of low frequency noise. While their effect on the bias-dependence of LFN has been well investigated, the way these noise mechanisms contribute to the bias-dependence of variability of LFN has been less well understood. LFN variability has been shown to be maximized in weak inversion (sub-threshold), while increased drain bias also increases LFN variability. However, no compact model has been proposed to explain this bias-dependence in detail. In combination with the charge-based formulation of LFN, the present paper proposes a new model for bias-dependence of LFN variability. Comparison with experimental data from moderately-sized NMOS and PMOS transistors at all bias conditions provides insight into how carrier number and mobility fluctuation mechanisms impact the bias-dependence of LFN variability.
description: 8 pages, 5 figures
Revisiting the dust destruction efficiency of supernovae
Creators: name: Priestley, F. D.
name: Chawner, H.
name: Matsuura, M.
name: De Looze, I.
name: Barlow, M. J.
name: Gomez, H. L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Dust destruction by supernovae is one of the main processes removing dust from the interstellar medium (ISM). Estimates of the efficiency of this process, both theoretical and observational, typically assume a shock propagating into a homogeneous medium, whereas the ISM possesses significant substructure in reality. We self-consistently model the dust and gas properties of the shocked ISM in three supernova remnants (SNRs), using X-ray and infrared (IR) data combined with corresponding emission models. Collisional heating by gas with properties derived from X-ray observations produces dust temperatures too high to fit the far-IR fluxes from each SNR. An additional colder dust component is required, which has a minimum mass several orders of magnitude larger than that of the warm dust heated by the X-ray emitting gas. Dust-to-gas mass ratios indicate that the majority of the dust in the X-ray emitting material has been destroyed, while the fraction of surviving dust in the cold component is plausibly close to unity. As the cold component makes up virtually all the total dust mass, destruction timescales based on homogeneous models, which cannot account for multiple phases of shocked gas and dust, may be significantly overestimating actual dust destruction efficiencies, and subsequently underestimating grain lifetimes.
description: 12 pages, 9 figures. MNRAS accepted 31/10/2020
The Initial Cluster Mass Function of Super Star Clusters in Irregular and Spiral Galaxies
Creators: name: Dowell, Jayce D.
name: Buckalew, Brent A.
name: Tan, Jonathan C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The initial cluster mass function (ICMF) is a fundamental property of star formation in galaxies. To gauge its universality, we measure and compare the ICMFs in irregular and spiral galaxies. Our sample of irregular galaxies is based on 13 nearby galaxies selected from a volume-limited sample from the fifth data release of the Sloan Digital Sky Survey (SDSS). The extinctions, ages, and masses were determined by comparing their u'g'i'z' magnitudes to those generated from starburst models. Completeness corrections were performed using Monte Carlo simulations in which artificial clusters were inserted into each galaxy. We analyzed three nearby spiral galaxies with SDSS data in exactly the same way to derive their ICMF based on a similar number of young, massive clusters as the irregular galaxy ICMF. We find that the ICMFs of irregular and spiral galaxies for masses >3x10^4 M_sun are statistically indistinguishable. For clusters more massive than 3x10^4 M_sun, the ICMF of the irregular galaxies is reasonably well fit by a power law dN(M)/dM ~ M^-a_M with a_M = 1.88 +/- 0.09. Similar results were obtained for the ICMF of the spiral galaxy sample but with a_M = 1.75 +/- 0.06. We discuss the implications of our result for theories of star cluster formation: the shape of the ICMF appears to be independent of metallicity and galactic shear rate.
description: Accepted for publication in AJ. 19 pages, 7 figures, 4 tables. The full version of Table 2 is avaliable as a TeX file at http://www.astro.indiana.edu/~jdowell/astroph/0611586/tab2.tex.gz or as a set of machine-readable files at http://www.astro.indiana.edu/~jdowell/astroph/0611586/tab2.tar.gz
Nested Topological Order
Creators: name: Bombin, H.
name: Martin-Delgado, M. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce the concept of nested topological order in a class of exact quantum lattice Hamiltonian models with non-abelian discrete gauge symmetry. The topological order present in the models can be partially destroyed by introducing a gauge symmetry reduction mechanism. When symmetry is reduced in several islands only, this imposes boundary conditions to the rest of the system giving rise to topological ground state degeneracy. This degeneracy is related to the existence of topological fluxes in between islands or, alternatively, hidden charges at islands. Additionally, island deformations give rise to an extension of topological quantum computation beyond quasiparticles.
description: revtex4, 4 pages
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of: S.S Mersey (Steamship)
Creators: name: Davies, Gareth J.S.
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The S.S Mersey was a coastal cargo ship which sailed around the U.K. On Jul 31st 1886 the S.S. Mersey while sailing from Newport Wales to Liverpool ran aground on rocks at Penhros Point south of the South Stack Lighthouse and was wrecked. The previous day the S.S Mersey had picked up the 4 crewmembers of the schooner Clarissa which had sunk near the Cardigan Bay Lightship. Both the crew of the S.S Mersey and the Clarissa were forced to take to lifeboats.
Multiple bounded variation solutions for a prescribed mean curvature equation with Neumann boundary conditions
Creators: name: Boscaggin, A.
name: Colasuonno, F.
name: De Coster, C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35J93, 35A24, 35B05, 35B09, 35B45

description: We prove the existence of multiple positive BV-solutions of the Neumann problem $$ \begin{cases} \displaystyle -\left(\frac{u'}{\sqrt{1+u'^2}}\right)'=a(x)f(u)\quad&\mbox{in }(0,1), u'(0)=u'(1)=0,& {cases} $$ where $a(x) > 0$ and $f$ belongs to a class of nonlinear functions whose prototype example is given by $f(u) = -λu + u^p$, for $λ> 0$ and $p > 1$. In particular, $f(0)=0$ and $f$ has a unique positive zero, denoted by $u_0$. Solutions are distinguished by the number of intersections (in a generalized sense) with the constant solution $u = u_0$. We further prove that the solutions found have continuous energy and we also give sufficient conditions on the nonlinearity to get classical solutions. The analysis is performed using an approximation of the mean curvature operator and the shooting method.
description: 28 pages, 1 figure
On the eigenvalue problem for arbitrary odd elements of the Lie superalgebra gl(1|n) and applications
Creators: name: Lievens, S.
name: Stoilova, N. I.
name: Van der Jeugt, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In a Wigner quantum mechanical model, with a solution in terms of the Lie superalgebra gl(1|n), one is faced with determining the eigenvalues and eigenvectors for an arbitrary self-adjoint odd element of gl(1|n) in any unitary irreducible representation W. We show that the eigenvalue problem can be solved by the decomposition of W with respect to the branching gl(1|n) --> gl(1|1) + gl(n-1). The eigenvector problem is much harder, since the Gel'fand-Zetlin basis of W is involved, and the explicit actions of gl(1|n) generators on this basis are fairly complicated. Using properties of the Gel'fand-Zetlin basis, we manage to present a solution for this problem as well. Our solution is illustrated for two special classes of unitary gl(1|n) representations: the so-called Fock representations and the ladder representations.
Το καλλιτεχνικό animation
Creators: name: Γκωλέκα, Χριστίνα Χριστόδουλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: animation
πειραματικό
experimental

description: Το animation μπορεί κάλλιστα να χαρακτηριστεί ως η δημοφιλέστερη μορφή τέχνης. Το παραπάνω είναι απόρροια της δυνατότητάς του να προσεγγίζει ένα ευρύτατο φάσμα κοινού, καθώς επίσης να εκμεταλλεύεται και να διευρύνεται, αναπτύσσοντας έναν ιδιαίτερο κώδικα, μία εικαστική γλώσσα η οποία εντάσσει τα τελευταία χρόνια τις δυνατότητες της ψηφιακής τεχνολογίας. Μπογιές, κούκλες, άμμος, φωτογραφίες, αντικείμενα, χαρτιά, μπορούν να χρησιμοποιηθούν ώστε να αποδώσουν την ψευδαίσθηση της κίνησης που είναι και ο πρωταρχικός σκοπός του δημιουργού είτε πρόκειται για animation δύο διαστάσεων είτε τριών. Με την συνεισφορά της λογοτεχνίας και την οικειοποίηση ζωγραφικών έργων τέχνης, ο καλλιτέχνης δύναται να ανανεώνει συνεχώς το οπτικό του έργο. Η περίπτωση του William Kentridge, των αδερφών Quay και της Kathy Smith μας αποδεικνύουν την αυτοτέλεια του animation που διαμορφώνεται μέσω του ιδιαίτερου τρόπου δημιουργίας του και προβολής του. Το ελληνικό animation εξετάζεται αρχικά ως προς τις βασικές του συνιστώσες (εκπαίδευση, οργανισμοί και εταιρείες, φεστιβάλς). Έπειτα παρουσιάζονται σύγχρονοι δημιουργοί όπως ο Στέλιος Πολυχρονάκης, ο Μπάμπης Βενετόπουλος και η Κατερίνα Αθανασοπούλου που προσπαθούν μέσω του έργου τους να συμβάλλουν στην αυτονομία της τέχνης του animation.
description: The animation may be characterized as the most popular form of art. The above is the result of his ability to approach a wide range of audiences, as well as exploiting and widening by developing a specific code, an artistic language which integrates during the recent years the possibilities of digital technology. Paints, dolls, sand, pictures, objects, paper, can be used to convey the illusion of movement, which is the primary purpose of the creator whether is a two-dimensional animation or three-dimensional one. With the contribution of literature and the appropriation of pictorial art, the artist may continually renews the visual project. The case of William Kentridge, Quay brothers and Kathy Smith shows us the autonomy of animation formed by the particular mode of his creation and his projection. The Greek animation is examined firstly as to its basic components (education, organizations and companies, festivals). Afterwards we present some of the contemporary creators such as Stelios Polihronakis, Babis Venetopoulos and Katerina Athanasopoulou, who are trying through their work to contribute to the autonomy of the art of animation.
Ανάλυση του χρόνου αντίδρασης στην νευροψυοχολογική δοκιμασία κατονομασίας εικόνων : Μια προσέγγιση αναγνώρισης προτύπων
Creators: name: Σιάτρα, Βασιλική Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Κατονομασία εικόνων
Χρόνος αντίδρασης
Αναγνώριση προτύπων
Picture naming
Reaction Time
Pattern recognition

description: Η παρούσα εργασία αποτελεί μια εναλλακτική πρόταση προσέγγισης του προβλήματος αξιόπιστης καταγραφής του χρόνου αντίδρασης στα πλαίσια της νευροψυχολογικής δοκιμασίας κατονομασίας εικόνων. Η μεθοδολογία που ακολουθείται στη σύγχρονη πειραματική μελέτη του χρόνου αντίδρασης με καταγραφή της έναρξης φώνησης (onset time) κατά την απόκριση στηρίζεται κυρίως στη μεθοδολογία των Συσκευών Φωνητικής Ενεργοποίησης (Voice Key methods electronic devices) και στην επεξεργασία της κυματομορφής των ηχητικών συμβάντων ένα προς ένα. Η παρούσα εργασία εισάγει τη μεθοδολογία της αναγνώρισης προτύπων (pattern recognition) στην ανάλυση του χρόνου απόκρισης (Reaction Trime – RT) ως μια εναλλακτική πρόταση με στόχο τη βελτίωση της αξιοπιστίας της καταγραφής και τη μείωση στο ελάχιστο της απώλειας δεδομένων. Κινούμενη στη λογική της αναγνώρισης προτύπων η εργασία δομείται πάνω σε τρεις άξονες: α) παρουσίαση του προβλήματος και περιγραφή-ανάλυση φυσικού αντικειμένου (state of the art), β) παρουσίαση της προτεινόμενης μεθοδολογίας αναγνώρισης προτύπων, και τέλος γίνεται γ) μια αρχική πρόταση μοντελοποίησης ενός ολοκληρωμένου συστήματος παρουσίασης ερεθισμάτων (εικόνων), καταγραφής χρόνων απόκρισης και ανάλυσης των δεδομένων.
description: This study explores the issue of accuracy of onset time detection in the context of the neuropsychological picture naming test. Due to experimental design requirements for big amount of data analysis, the majority of studies in order to avoid the time-consuming waveform manual inspection method use the standard amplitude threshold method applied with voice-key devices. Nevertheless, this method is uneasy to use and results in an inaccurate and very high missing data rate. The manuscript proposes the pattern recognition method as an alternative approach in time onset detection problem. The goal is to improve the accuracy by reducing the error in time detection analysis and gain advantage of the desirable absence of missing data. The study is divided in three major parts: a) presentation of state-of-the-art methods, b) presentation and implementation of the pattern recognition approach and c) initial proposal for a completed system for testing, recording and analyzing data in picture naming context.
Welsh Wreck Web Research Project (North Cardigan Bay). On-line research into the wreck of the: Miningu
Creators: name: Perks, Graeme
Publisher: name: Archaeology Data Service
Year: 2024

description: Welsh Wreck Web Research Project unpublished report series, 1
description: The Miningu was built in Quebec in 1865 by Charland and sailed to London and put up for sale. It took a year to sell Miningu and she is then registered in Cardiff, sailing to South America with coal before continuing to the Peruvian guano islands to load to return to Britain. These routes continued until 1875 when Miningu sailed for India, returning to France. Miningu then continued sailing her previous routes until the 1879 war between Peru and Chile when she changed to carrying coal to the Cape Verde Islands before continuing to the Southern USA, returning with timber. On her final voyage Miningu was carrying coal to Rio de Janeiro from Cardiff when she foundered in a severe gale in Cardigan Bay near Harlech, with the loss of 24 lives including the masters family.
Chiral symmetry patterns of excited mesons with the Coulomb-like linear confinement
Creators: name: Wagenbrunn, R. F.
name: Glozman, L. Ya.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The spectrum of $\bar q q$ mesons in a model where the only interaction is a linear Coulomb-like instantaneous confining potential is studied. The single-quark Green function as well as the dynamical chiral symmetry breaking are obtained from the Schwinger-Dyson (gap) equation. Given the dressed quark propagator, a complete spectrum of "usual" mesons is obtained from the Bethe-Salpeter equation. The spectrum exhibits restoration of chiral and $U(1)_A$ symmetries at large spins and/or radial excitations. This property is demonstrated both analytically and numerically. At large spins and/or radial excitations higher degree of degeneracy is observed, namely all states with the given spin fall into reducible representations $[(0,1/2) \oplus (1/2,0)] \times [(0,1/2) \oplus (1/2,0)]$ that combine all possible chiral multiplets with the given $J$ and $n$. The structure of the meson wave functions as well as the form of the angular and radial Regge trajectories are investigated.
description: 1. Order of references has been changed and one reference has been added; 2. A short discussion of nonrelativistic and semirelativistic quark models has been added in the conclusion part on referee's request. To appear in Phys. Rev. D
Η αυτο-εξόρια και η επιθυμία για φυγή στο θέατρο του Bernard-Marie Koltès.
Creators: name: Αιμονιώτης, Αλέξανδρος Ευάγγελου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Αυτο-εξορία
Επιθυμία για φυγή
Self-exile
Desire for escapism
autooexil
Desir de s'enfuir
Bernard-Marie Koltes
3. Escapism

description: Ο σκοπός της διατριβής ήταν η μελέτη επιλεγμένων θεατρικών έργων του Γάλλου συγγραφέα Bernard-Marie Koltès υπό το πρίσμα δύο όρων που διέπουν το έργο του: την Αυτο-εξορία και την επιθυμία για φυγή. Ως Αυτο-εξορία μελετήθηκε η τάση των προσώπων να προκαλούν εθελούσια τον εξορισμό τους, είτε φυσικά είτε ψυχολογικά. Διερευνήθηκαν τόσο οι λόγοι όσο και οι συνέπειες αυτής της τάσης πάνω στα πρόσωπα και στην εξέλιξη του θεατρικού κειμένου. Ως επιθυμία για φυγή μελετήθηκε το παράδοξο που συναντάμε στο θέατρο του Bernard-Marie Koltès, το οποίο έγκειται στην προσπάθεια των προσώπων να ξεφύγουν από αυτή την κατάσταση εκούσιας εξορίας στην οποία βρίσκονται. Αναλύθηκαν ο όρος «δοσοληψία» ώς αναπόσπαστο και δομικό κομμάτι της δραματουργίας του Koltès καθώς και ο ρόλος της βίας και της εγκληματικής πράξης ως μέσο πνευματικής και σωματικής απελευθέρωσης των προσώπων.
description: The aim of the present thesis was the study of select plays of French play-write Bernard-Marie Koltès in the light of two terms, reflected throughout his literary production: Self-exile and the desire for escapism. By the term Self-exile, we studied the tendency of self-inflicted exile, expressed by the characters either physically or psychologically. Both the reasons of this tendency, as well as the consequences it had not only on the characters but also on the evolution of the theatrical text, were studied. By the term desire for escapism, we refer to the paradox found in the works of Bernard-Marie Koltès, which lies in the effort put by the characters to escape this self-inflicted state of exile. We analyzed the term «deal» as a constitutive and structural part of the works of Koltès as well as the role of violence and criminal act as a means of spiritual and physical liberation of the characters.
Spin Hall Effect For Anyons
Creators: name: Dhar, S.
name: Basu, B.
name: Ghosh, Subir
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We explain the intrinsic spin Hall effect from generic anyon dynamics in the presence of external electromagnetic field. The free anyon is represented as a spinning particle with an underlying non-commutative configuration space. The Berry curvature plays a major role in the analysis.
description: Title changed, thoroughly revised version, no change in math. content, reference section enlarged, to appear in Physics Letters A
Descent Relations and Oscillator Level Truncation Method
Creators: name: Aref'eva, I. Ya.
name: Gorbachev, R.
name: Medvedev, P. B.
name: Rychkov, D. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We reexamine the oscillator level truncation method in the bosonic String Field Theory (SFT) by calculation the descent relation =Z_3
description: 21 pages, 10 figures, Latex
New integral formulas and identities involving special numbers and functions derived from certain class of special combinatorial sums
Creators: name: Simsek, Yilmaz
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 005A15, 11B68, 11B73, 11B83, 26C05, 11S40, 11S80, 33B15

description: By applying p-adic integral on the set of p-adic integers in [27] (Interpolation Functions for New Classes Special Numbers and Polynomials via Applications of p-adic Integrals and Derivative Operator, Montes Taurus J. Pure Appl. Math. 3 (1), ...--..., 2021 Article ID: MTJPAM-D-20-00000), we constructed generating function for the special numbers and polynomials involving the following combinatorial sum and numbers: y(n,λ)=\sum_{j=0}^{n}\frac{(-1)^{n}}{(j+1)λ^{j+1}\left(λ-1\right) ^{n+1-j}} The aim of this paper is to use the numbers y(n,λ) to derive some new and novel identities and formulas associated with the Bernstein basis functions, the Fibonacci numbers, the Harmonic numbers, the alternating Harmonic numbers, binomial coefficients and new integral formulas for the Riemann integral. We also investigate and study on open problems involving the numbers y(n,λ) in [27]. Moreover, we give relation among the numbers y(n,(1/2)), the Digamma function, and the Euler constant. Finally, we give conclusions for the results of this paper with some comments and observations.
description: 12
Quantum gravity computers: On the theory of computation with indefinite causal structure
Creators: name: Hardy, Lucien
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A quantum gravity computer is one for which the particular effects of quantum gravity are relevant. In general relativity, causal structure is non-fixed. In quantum theory non-fixed quantities are subject to quantum uncertainty. It is therefore likely that, in a theory of quantum gravity, we will have indefinite causal structure. This means that there will be no matter of fact as to whether a particular interval is timelike or not. We study the implications of this for the theory of computation. Classical and quantum computations consist in ivolving the state of the computer through a sequence of time steps. This will, most likely, not be possible for a quantum gravity computer because the notion of a time step makes no sense if we have indefinite causal structure. We show that it is possible to set up a model for computation even in the absence of definite causal structure by using a certain framework (the causaloid formalism) that was developed for the purpose of correlating data taken in this type of situation. Corresponding to a physical theory is a causaloid, Lambda (this is a mathematical object containing information about the causal connections between different spacetime regions). A computer is given by the pair {Lambda, S} where S is a set of gates. Working within the causaloid formalism, we explore the question of whether universal quantum gravity computers are possible. We also examine whether a quantum gravity computer might be more powerful than a quantum (or classical) computer. In particular, we ask whether indefinite causal structure can be used as a computational resource.
description: 24 pages. For proceedings of "Quantum Reality, Relativistic Causality, and Closing the Epistemic Circle: An International Conference in Honour of Abner Shimony"
Τοπικό περιβάλλον, κοινωνική υπευθυνότητα και ο ρόλος των παιδιών ως ενεργών πολιτών στο πολυπολιτισμικό νηπιαγωγείο
Creators: name: Μωυσιάδου, Ελένη Αβραάμ
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ενεργός πολίτης
Πολυπολιτισμικό νηπιαγωγείο
Προσχολική αγωγή
Active citizen
Multicultural kindergarden
Preschool education

description: Η κύρια πρόταση της παρούσας ερευνητικής διαδικασίας αναφέρεται στη λειτουργική ανάπτυξη δεξιοτήτων και κατανόησης εννοιών από τα παιδιά με σκοπό να τα καταστήσουν αυριανούς ενεργούς πολίτες. Για τον σκοπό αυτό αναπτύχθηκαν διδακτικά σενάρια και σχέδια δράσης που απευθύνθηκαν σε 9 παιδιά προσχολικής ηλικίας σε ένα πολυπολιτισμικό νηπιαγωγείο. Ακολουθήθηκε η διαθεματική προσέγγιση σύμφωνα με την οποία δομήθηκαν τα σενάρια και η οποία συνδύασε τρεις «αλληλεξαρτώμενους πυλώνες» της αειφόρου ανάπτυξης: την «κοινωνική ανάπτυξη» την «οικονομική ανάπτυξη» και την «προστασία του περιβάλλοντος». Η εκπαίδευση για την αειφόρο ανάπτυξη συνδυάστηκε με το λειτουργικό μοντέλο της ιδιότητας του ενεργού πολίτη σύμφωνα με τις εξής διαστάσεις: της «διαμαρτυρίας» και της «κοινωνικής αλλαγής», της «κοινοτικής ζωής», της «αντιπροσωπευτικής δημοκρατίας» και των «δημοκρατικών αξιών». Η ανάπτυξη όλων των εκπαιδευτικών σεναρίων της παρούσας ερευνητικής προσπάθειας βασίστηκε στις θεωρίες της βιωματικής και ενεργητικής μάθησης. Βρέθηκε ότι το επίπεδο της συμμετοχής σε δράσεις που αφορούν το περιβάλλον, καθορίζει το βαθμό στον οποίο τα παιδιά εκπαιδεύονται στις δημοκρατικές διαδικασίες με σκοπό να γίνουν υπεύθυνοι και δημοκρατικοί πολίτες. Τα παιδιά τελικά κατάφεραν να αξιολογήσουν καταστάσεις και δεδομένα και να αναπτύξουν προτάσεις, ιδέες και λύσεις πάνω σε θέματα που τους αφορούν άμεσα..
description: The main suggestion of this investigation is referred to the functional development of skills and apprehension of notions from the children in order to make them future active citizens. For this reason, didactic possible situations and action projects have developed which were addressed to 9 children of a pre-school age in a multi-cultural kindergarden school. A cross-cultural approach followed according to which possible situations were imaged which combined three “interdependent pylons” of sustainable development; the “social development” the “financial growth” and the “protection of the environment”. The education for sustainable development was combined with the functional model of the attribute of active citizen according to the dimensions of “protest” and “social change”, “communal life”, “representative democracy” and “democratic values”. The development of all educational scenarios of this investigatory effort was based on theories of experiential and active learning. It was found that the level of participation in actions which concern the environment defines the rate in which the children are educated in democratic procedures so that they can be responsible and democratic citizens. Eventually, the children succeeded in evaluating situations and data and develop suggestions ideas and provide solutions on issues which concern them.
De novo transcriptome assembly of polyploid organisms: insights from working with diploid and tetraploid wheat
Creators: name: Krasileva, Ksenia
name: Buffalo, Vince
name: Dubcovsky, Jorge
Publisher: name: Zenodo
Year: 2012

description: Wheat (Triticum spp.) was domesticated at the dawn of agriculture ~10,000 years ago and has since been adapted to grow in different environments throughout the world. Today, wheat remains among the three most cultivated crops and is a major source of calories and protein for the human population. Cultivated wheat varieties were derived from two species, hexaploid Triticum aestivum (bread wheat) and tetraploid Triticum turgidum (durum or pasta wheat). Similar to many other grasses, wheat originated from interspecific hybridization events that resulted in the AABB genome of T. turgidum and the AABBDD - of T. aestivum. The A genome was contributed by the wild diploid species T. urartu, the B genome by an extinct Aegilopsspecies from the Section Sitopsis and the D genome by Aegilops tauschii. Wheat belongs to the Poaceae family (also called Gramineae or true grasses).Other prominent grasses with sequenced genomes include Oryza sativa (rice) and Zea mays (corn). The total size one diploid copy of wheat genome is estimated to be around 6000 Mb; it is 15 times the size of a rice genome and 50 times the size of Arabidopsis genome. Despite the large size of the genome, gene-coding region of wheat is comparable to other grasses and constitutes only 1-2% percent of the total wheat genome. During this study, we have sequenced and assembled transcriptomes of a tetraploid Triticum turgidum and its closely related diploid relative Triticum urartu. We have examined several parameters affecting the assembly of polyploid wheat compared to the diploid wheat and incorporated additional steps necessary for the genome-specific assembly.
Aerodynamic interaction of bristled wing pairs in fling
Creators: name: Kasoju, Vishwa T.
name: Santhanakrishnan, Arvind
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Tiny flying insects of body lengths under 2 mm use the `clap-and-fling' mechanism with bristled wings for lift augmentation and drag reduction at chord-based Reynolds number ($Re$) on $\mathcal{O}$(10). We examine wing-wing interaction of bristled wings in fling at $Re$=10, as a function of initial inter-wing spacing ($δ$) and degree of overlap between rotation and linear translation. A dynamically scaled robotic platform was used to drive physical models of bristled wing pairs with the following kinematics (all angles relative to vertical): 1) rotation about the trailing edge to angle $θ_\text{r}$; 2) linear translation at a fixed angle ($θ_\text{t}$); and 3) combined rotation and linear translation. The results show that: 1) cycle-averaged drag coefficient decreased with increasing $θ_\text{r}$ and $θ_\text{t}$; and 2) decreasing $δ$ increased the lift coefficient owing to increased asymmetry in circulation of leading and trailing edge vortices. A new dimensionless index, reverse flow capacity (RFC), was used to quantify the maximum possible ability of a bristled wing to leak fluid through the bristles. Drag coefficients were larger for smaller $δ$ and $θ_\text{r}$ despite larger RFC, likely due to blockage of inter-bristle flow by shear layers around the bristles. Smaller $δ$ during early rotation resulted in formation of strong positive pressure distribution between the wings, resulting in increased drag force. The positive pressure region weakened with increasing $θ_\text{r}$, which in turn reduced drag force. Tiny insects have been reported to use large rotational angles in fling, and our findings suggest that a plausible reason is to reduce drag forces.
description: 1 table, 22 figures, 45 pages
Fluctuations in subsystems of the zero temperature XX chain: Emergence of an effective temperature
Creators: name: Eisler, V.
name: Legeza, O.
name: Racz, Z.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The zero-temperature XX chain is studied with emphasis on the properties of a block of $L$ spins inside the chain. We investigate the quantum fluctuations resulting from the entanglement of the block with the rest of the chain using analytical as well as numerical (density matrix renormalization group) methods. It is found that the rest of the chain acts as a thermal environment and an effective temperature can be introduced to describe the fluctuations. We show that the effective temperature description is robust in the sense that several independent definitions (through fluctuation dissipation theorem, comparing with a finite temperature system) yield the same functional form in the limit of large block size ($L\to\infty$). The effective temperature can also be shown to satisfy the basic requirements on how it changes when two bodies of equal or unequal temperatures are brought into contact.
description: 19 pages, 7 figures
Braneworld cosmological singularities
Creators: name: Antoniadis, Ignatios
name: Cotsakis, Spiros
name: Klaoudatou, Ifigeneia
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The purpose of this brief report is to present some results of our on-going project on the asymptotic behaviour of braneworld-type solutions on approach to their possible finite `time' singularities.
description: 3 pages, contribution to appear in the Proceedings of the MG11 Meeting, Berlin, July 2006
Ανάπτυξη δεξιοτήτων ομαδικού παιχνιδιού σε παιδιά με αυτισμό και νοητική αναπηρία: εκπαιδευτικό πρόγραμμα παρέμβασης σε ειδικό νηπιαγωγείο
Creators: name: Μπαντά, Παναγιώτα Αριστοτέλη
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Κοινωνικές δεξιότητες
Ομαδικό παιχνίδι
Αυτισμός και νοητική αναπηρία
Social skills
Group play
Autism and intellectual disability

description: The purpose of this action research was to examine the effectiveness of an educational intervention program for the development of social relationships through group play between two students with autism and intellectual disabilities. The group of students play resembled that of typical child development in the corresponding mental age. It was conducted from March 2015 until June 2015 in a Special Kindergarten in Thessaloniki. This research was participatory, since the kindergarten teacher and researcher was an organic member of the entire research process. Results showed significant improvements and benefits after daily training. Aside from increased social skills through interaction, it was observed reduction in negative behaviors and improvement of the quality of interaction. These findings suggest that an educational social skills intervention program can help to improve social relations in an efficient and effective manner.
Weak Boson Emission in Hadron Collider Processes
Creators: name: Baur, U.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The O(alpha) virtual weak radiative corrections to many hadron collider processes are known to become large and negative at high energies, due to the appearance of Sudakov-like logarithms. At the same order in perturbation theory, weak boson emission diagrams contribute. Since the W and Z bosons are massive, the O(alpha) virtual weak radiative corrections and the contributions from weak boson emission are separately finite. Thus, unlike in QED or QCD calculations, there is no technical reason for including gauge boson emission diagrams in calculations of electroweak radiative corrections. In most calculations of the O(alpha) electroweak radiative corrections, weak boson emission diagrams are therefore not taken into account. Another reason for not including these diagrams is that they lead to final states which differ from that of the original process. However, in experiment, one usually considers partially inclusive final states. Weak boson emission diagrams thus should be included in calculations of electroweak radiative corrections. In this paper, I examine the role of weak boson emission in those processes at the Fermilab Tevatron and the CERN LHC for which the one-loop electroweak radiative corrections are known to become large at high energies (inclusive jet, isolated photon, Z+1 jet, Drell-Yan, di-boson, t-bar t, and single top production). In general, I find that the cross section for weak boson emission is substantial at high energies and that weak boson emission and the O(alpha) virtual weak radiative corrections partially cancel.
description: revtex3, 41 pages, 16 figures, 3 tables
Phase transition in the magnetocrystalline anisotropy of tetragonal Heusler alloys: Rh$_2T$Sb, $T=$ Fe, Co
Creators: name: Fecher, Gerhard H.
name: He, Yankun
name: Felser, Claudia
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: This work reports on first principles calculations of the electronic and magnetic structure of tetragonal Heusler compounds with the composition Rh$_2$Fe$_{x}$Co$_{1-x}$Sb ($0\leq x\leq1$). It is found that the magnetic moments increase from 2 to 3.4~$μ_B$ and the Curie temperature decreases from 500 to 464~K with increasing Fe content $x$. The $3d$ transition metals make the main contribution to the magnetic moments, whereas Rh contributes only approximately 0.2~$μ_B$ per atom, independent of the composition. The paper focuses on the magnetocrystalline anisotropy of the borderline compounds Rh$_2$FeSb, Rh$_2$Fe$_{0.5}$Co$_{0.5}$Sb, and Rh$_2$CoSb. A transition from easy-axis to easy-plane anisotropy is observed when the composition changes from Rh$_2$CoSb to Rh$_2$FeSb. The transition occurs at an iron concentration of approximately 40\%.
description: 15 pages
Oral and literate (R)evolutions
Creators: name: Hutton, Scot
Publisher: name: University of British Columbia
Year: 2009

description: This thesis is an investigation into some of the effects upon 1) ancient Greece as it shifted from a preliterate to a literate society; and upon 2) North America as it shifts from a primarily literate culture to one which relies upon electronic media (a mixture of literacy and prality which incorporates both but in the final analysis is neither). Because of the breadth of the topic I have created three chapters which are meant to stand on their own (each with its own bibliography). Even though this is a progressive (nonlinear) investigation which spends little time attempting to draw conclusions, the theme of (r)evolutions in communications unite the tangents of inquiry which comprise this project. The twentieth century has produced epistemological, sociocultural, and, with the help of the evolution of electronic media, communications revolutions at least as jarring as those of fifth and sixth century B C E Greece. It is between these two (r)evolutionary periods that I draw parallels. The fundamental ideas behind the communication (r)evolution in ancient Greece, the shift from a preliterate to a literate society, is known to many. But what is of known of the epistemological, sociocultural, and cognitive changes coinciding with these shifts? It is these past transformations I hope illuminate so that we might better understand through comparison, the implications of the complex revolutions in communication we are in the midst of today.
Evidence of Precession of the White Dwarf in Cataclysmic Variables
Creators: name: Tovmassian, G.
name: Zharikov, S.
name: Neustroev, V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Cataclysmic Variables (CV) are close binary systems, in which the primary, the more massive star, is a white dwarf. CVs usually exhibit a number of periodicities, most of which are now understood. However, recently, a new phenomenon was discovered that does not fit the standard picture. Two objects have been discovered to show periods that are much longer than orbital, and have no relation to it, either in light curves or in radial velocity (RV) variations measured from spectroscopy. Here, we show that the precession of the fast rotating magnetically accreting white dwarf can successfully explain these phenomena. The theory of compact objects predicts certain relations between the spin and precession periods, and our finding provides a good test for the theory and establishes a qualitative model to be explored both theoretically and observationally. Detection of precession can become a powerful tool in searching for the internal properties of compact stars, which would be otherwise inaccessible for us.
description: 12 pages, 7 figures, accepted for publication in the ApJ
Construction and classification of p-ring class fields modulo p-admissible conductors
Creators: name: Mayer, Daniel C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11R37, 11R11, 11R16, 11R20, 11R27, 11R29, 11Y40

description: Each p-ring class field K(f) modulo a p-admissible conductor f over a quadratic base field K with p-ring class rank r(f) mod f is classified according to Galois cohomology and differential principal factorization type of all members of its associated heterogeneous multiplet M(K(f))=[(N(c,i))_{1<=i<=m(c)}]_{c|f} of dihedral fields N(c,i) with various conductors c|f having p-multiplicities m(c) over K such that sum_{c|f} m(c)=(p^r(f)-1)/(p-1). The advanced viewpoint of classifying the entire collection M(K(f)), instead of its individual members separately, admits considerably deeper insight into the class field theoretic structure of ring class fields, and the actual construction of the multiplet M(K(f)) is enabled by exploiting the routines for abelian extensions in the computational algebra system Magma.
description: 10 pages, 4 tables
Constraining the evolution of dark energy with type Ia supernovae and gamma-ray bursts
Creators: name: Qi, Shi
name: Wang, Fa-Yin
name: Lu, Tan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The behavior of the dark energy equation of state (EOS) is crucial in distinguishing different cosmological models. With a model independent approach, we constrain the possible evolution of the dark energy EOS. Gamma-ray bursts (GRBs) of redshifts up to $z>6$ are used, in addition to type Ia supernovae (SNe Ia). We separate the redshifts into 4 bins and assume a constant EOS parameter for dark energy in each bin. The EOS parameters are decorrelated by diagonalizing the covariance matrix. And the evolution of dark energy is estimated out of the uncorrelated EOS parameters. By including GRB luminosity data, we significantly reduce the confidence interval of the uncorrelated EOS parameter whose contribution mostly comes from the redshift bin of $0.5
description: 7 pages, 17 figures. Corrected typos in Eq.(16)(17)(21)