cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Formation of Venus, Earth and Mars: Constrained by isotopes
Creators: name: Lammer, H.
name: Brasser, R.
name: Johansen, A.
name: Scherf, M.
name: Leitzinger, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We discuss the current state of knowledge of terrestrial planet formation from the aspects of different planet formation models and isotopic data from 182Hf-182W, U-Pb, lithophile-siderophile elements, 48Ca/44Ca isotope samples from planetary building blocks, 36Ar/38Ar, 20Ne/22Ne, 36Ar/22Ne isotope ratios in Venus' and Earth's atmospheres, the expected solar 3He abundance in Earth's deep mantle and Earth's D/H sea water ratios that shed light on the accretion time of the early protoplanets. Accretion scenarios that can explain the different isotope ratios, including a Moon-forming event after ca. 50 Myr, support the theory that the bulk of Earth's mass (>80%) most likely accreted within 10-30 Myr. From a combined analysis of the before mentioned isotopes, one finds that proto-Earth accreted 0.5-0.6 MEarth within the first ~4-5 Myr, the approximate lifetime of the protoplanetary disk. For Venus, the available atmospheric noble gas data are too uncertain for constraining the planet's accretion scenario accurately. However, from the available Ar and Ne isotope measurements, one finds that proto-Venus could have grown to 0.85-1.0 MVenus before the disk dissipated. Classical terrestrial planet formation models have struggled to grow large planetary embryos quickly from the tiniest materials within the typical lifetime of protoplanetary disks. Pebble accretion could solve this long-standing time scale controversy. Pebble accretion and streaming instabilities produce large planetesimals that grow into Mars-sized and larger planetary embryos during this early accretion phase. The later stage of accretion can be explained well with the Grand-Tack, annulus or depleted disk models. The relative roles of pebble accretion and planetesimal accretion/giant impacts are poorly understood and should be investigated with N-body simulations that include pebbles and multiple protoplanets.
description: 49 pages, 7 figures. This is a preprint of an article published in Space Science Reviews. The final authenticated version can be found online at: https://doi.org/10.1007/s11214-020-00778-4
The simple random walk and max-degree walk on a directed graph
Creators: name: Montenegro, Ravi
Publisher: name: arXiv
Year: 2006
Subjects: subject: Combinatorics (math.CO)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J10; 68W20

description: We show bounds on total variation and $L^{\infty}$ mixing times, spectral gap and magnitudes of the complex valued eigenvalues of a general (non-reversible non-lazy) Markov chain with a minor expansion property. This leads to the first known bounds for the non-lazy simple and max-degree walks on a (directed) graph, and even in the lazy case they are the first bounds of the optimal order. In particular, it is found that within a factor of two or four, the worst case of each of these mixing time and eigenvalue quantities is a walk on a cycle with clockwise drift.
title: Entrepreneurship Education and the Strategic Perspective
title: Setting a research agenda for university-wide roles and responsibilities
titleType: Subtitle
Creators: name: Crammond, Robert
Publisher: name: Zenodo
Year: 2025

description: With emerging examples and offerings dating back to the mid-20th century, Entrepreneurship Education (EE) is now an omnipresent feature within universities today. Whether represented within a dedicated programme, offered within thematic business-facing workshops, or as a systematic route towards enhanced and consistent business and community engagement, EE can be regarded as a key element within Higher Education Institution (HEI) operations and feature of an institution’s identity.

However, along with the many approaches and applications of EE within the classroom environment encouraging skills or new venture development, it is of course subject to pedagogical, resource, and infrastructural changes as the HE sector moves with surrounding market trends and needs of industry. Recent developments within the United Kingdom (UK), directly or indirectly affecting the HE sector, including post-Brexit and post-pandemic challenges, student population shortfalls, and the advent of AI have all disrupted both the capacity and capability for universities to operate effectively and efficiently. This, arguably, necessitates the continued offering and developing of EE as a form of education cognisant of the wider regional community need. Additionally, EE presents the opportunity for business, sectors, and stakeholders, sharing objectives and visions with that of the university, to engage and achieve towards the national interest.

In light of recent crises, and ongoing volatility within the sector in the UK, this working paper discusses the increasing intersection of EE and institutional strategy, and the mobilising of EE approaches and activities which subsequently define the 21st century university. Following from this, an inductive multistakeholder approach is presented, forming a research agenda which confronts and compares the current strategies and suggestions from UK HEIs. This concerns a series of factors, including: institutional infrastructure and responsibilities; alignment to relevant EE-related policy; pedagogical approaches; engagement activities; and the building of entrepreneurial legacies which impact regional and national landscapes.

This working paper outlines a prescribed, phased methodology, which shall be of benefit to a range of stakeholders, chiefly within the HE sector and amongst EE educators and researchers. Furthermore, it shall establish present day resource challenges, sector complexities, and reflect on a number of perspectives from students to practitioners.
title: Disease surveillance, economic losses and trace back of pigs in the abattoir
Creators: name: Sunguya, Fokas Paul Anthony
Publisher: name: The University of Edinburgh
Year: 1981
Subjects: subject: Annexe MSc Digitisation Project 2022 Block 47
subject: Disease surveillance
subject: Economic losses
subject: Condemnation
subject: Traceability
subject: Abattoir

description: The losses resulting from condemnation of pig carcases and offal were investigated in a large abattoir. Meat inspection records were used to calculate the prevalence of diseases during 1980 and to make an assessment of economic losses. Approximately 6.5% of all animals slaughtered were wholly or partially condemned for one or more of 29 diseases. Abscesses accounted for about half of the condemnations. Economic losses amounted to £54j869 representing 2.7% of the value of the pigs slaughtered. An attempt was made to trace the origin of the pigs in the abattoir. Most of them had no identification marks and they were not easily traceable because they passed through a complex of auctioneers, wholesalers and other middlemen. Condemnations (in particular abscesses and arthritis) of pigs from a large commercial unit were investigated in detail, but only 7.5% of the pigs marketed were traced. The economic losses for the farmer were approximately £873 which was 2.5% of the value of the pigs slaughtered. Management practices in the unit were studied but the lack of identification marks made it impossible to relate disease prevalence to the faulty husbandry. Problems of using slaughterhouse data and the feedback of information to the producers are discussed.
The BLUES function method applied to partial differential equations and analytic approximants for interface growth under shear
Creators: name: Berx, Jonas
name: Indekeu, Joseph O.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: An iteration sequence based on the BLUES (beyond linear use of equation superposition) function method is presented for calculating analytic approximants to solutions of nonlinear partial differential equations. This extends previous work using this method for nonlinear ordinary differential equations with an external source term. Now, the initial condition plays the role of the source. The method is tested on three examples: a reaction-diffusion-convection equation, the porous medium equation with growth or decay, and the nonlinear Black-Scholes equation. A comparison is made with three other methods: the Adomian decomposition method (ADM), the variational iteration method (VIM), and the variational iteration method with Green function (GVIM). As a physical application, a deterministic differential equation is proposed for interface growth under shear, combining Burgers and Kardar- Parisi-Zhang nonlinearities. Thermal noise is neglected. This model is studied with Gaussian and space-periodic initial conditions. A detailed Fourier analysis is performed and the analytic coefficients are compared with those of ADM, VIM, GVIM, and standard perturbation theory. The BLUES method turns out to be a worthwhile alternative to the other methods. The advantages that it offers ensue from the freedom of choosing judiciously the linear part, with associated Green function, and the residual containing the nonlinear part of the differential operator at hand.
description: 39 pages, 17 figures. v4: accepted manuscript
Fluctuation theorem in quantum heat conduction
Creators: name: Saito, Keiji
name: Dhar, Abhishek
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider steady state heat conduction across a quantum harmonic chain connected to reservoirs modelled by infinite collection of oscillators. The heat, $Q$, flowing across the oscillator in a time interval $τ$ is a stochastic variable and we study the probability distribution function $P(Q)$. In the large $τ$ limit we use the formalism of full counting statistics (FCS) to compute the generating function of $P(Q)$ exactly. We show that $P(Q)$ satisfies the steady state fluctuation theorem (SSFT) regardless of the specifics of system, and it is nongaussian with clear exponential tails. The effect of finite $τ$ and nonlinearity is considered in the classical limit through Langevin simulations. We also obtain predictions of universal heat current fluctuations at low temperatures in clean wires.
description: 4 pages, 2 figures
Από τις γλωσσικές πρακτικές στη γλωσσική πολιτική: Η περίπτωση ελληνικών και μεικτών ελληνικών οικογενειών στη Μ. Βρετανία
Creators: name: Ανδρίτσου, Μαρία Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Οικογενειακή γλωσσική πολιτική
Παιδική διγλωσσία
Μεγάλη Βρετανία
Family language policy
Childhood bilingualism
Great Britain

description: Σκοπός της παρούσας έρευνας ήταν η μελέτη της «οικογενειακής γλωσσικής πολιτικής» (FLP) των γονέων πρώτης μεταναστευτικής γενιάς στο περιβάλλον της Μ. Βρετανίας και η πιθανή επίδραση αυτής στις διγλωσσικές δεξιότητες των παιδιών. Η ερευνητική αξία της παρούσας έρευνας εδράζεται στη μελέτη της FLP σε μία γλωσσική ομάδα γονέων η οποία δεν έχει προηγουμένως μελετηθεί στις αντίστοιχες κοινωνιογλωσσικές συνθήκες (οικογένειες στις οποίες και οι δύο γονείς έχουν ελληνική καταγωγή και είναι μετανάστες πρώτης γενιάς και μεικτές γλωσσικά οικογένειες στις οποίες ο ένας γονέας είναι ελληνικής καταγωγής και μετανάστης πρώτης γενιάς στη Μ. Βρετανία)· στη μελέτη της FLP σε σχέση με τις γλωσσικές πρακτικές και το οικογενειακό μοντέλο γλωσσικής χρήσης, τις γλωσσικές ιδεολογίες και στάσεις των γονέων, αλλά και τις πρακτικές γλωσσικής διαχείρισης εντός και εκτός σπιτιού· στη μελέτη της FLP σε σχέση με τις διγλωσσικές δεξιότητες των παιδιών τόσο στον προφορικό όσο και στον γραπτό λόγο· τέλος, στη μελέτη της FLP τόσο σε σχέση με τους παράγοντες που τη διαμορφώνουν στο οικογενειακό πλαίσιο (μικροεπίπεδο) όσο και σε σχέση με παράγοντες που δρουν περιφερειακά της οικογένειας και σχετίζονται με τις ευρύτερες γλωσσικές πρακτικές και ιδεολογίες και, πιο συγκεκριμένα, με την εκπαιδευτική γλωσσική πολιτική της Αγγλίας/Σκωτίας (μακροεπίπεδο)
description: The purpose of this research study was studying “family language policy” (FLP) of the first generation immigrant parents in the UK environment and the possible effect of FLP on children’s bilingual skills. The value of this study is based in the investigation of FLP in a linguistic group of parents which has not previously been studied under respective sociolinguistic conditions (families in which both parents are of greek origin and mixed-lingual families in which one parent is a first generation immigrant of greek origin in UK). More explicitly, we studied FLP in relation to parents’ language practices and family language use models, ideologies and attitudes, but also in relation to family language management practices inside and outside home. We also studied FLP in relation to children’s oral bilingual and biliteracy skills. Finally, we studied FLP formation both in relation to factors that shape FLP into the family context (microlevel) and in relation to factors concerning FLP and broader sociolinguistic practices and ideologies and, more specifically, the educational language policy of England/Scotland (macrolevel)
Searches for Gauge-Mediated SUSY Breaking Topologies with the L3 Detector at LEP
Creators: name: Gataullin, M.
name: Rosier, S.
name: Xia, L.
name: Yang, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Searches for topologies predicted by gauge-mediated SUSY breaking models were performed using data collected with the L3 detector at LEP. All possible lifetimes of the next-to-lightest SUSY particle (NLSP), neutralino or scalar tau, were considered. No evidence for these new phenomena was found and limits on the production cross sections and sparticle masses were derived. A scan over the parameters of the minimal GMSB model was performed, leading to lower limits of 62.2 GeV, 11 TeV, and 0.07 eV on the NLSP mass, the mass scale parameter Lambda, and the gravitino mass, respectively. The status of the LEP combined searches is also discussed.
description: 4 pages, 2 figures, 1 table; to appear in Proceedings of SUSY06, the 14th International Conference on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine, California, 12-17 June 2006
Dynamics of the NGC 4636 Globular Cluster System - An extremely dark matter dominated galaxy?
Creators: name: Schuberth, Y.
name: Richtler, T.
name: Dirsch, B.
name: Hilker, M.
name: Larsen, S. S.
name: Kissler-Patig, M.
name: Mebold, U.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first dynamical study of the globular cluster system of NGC 4636. This giant elliptical galaxy is claimed to be extremely dark matter dominated, according to X-ray observations. Using the VLT with FORS2/MXU, we obtained velocities for 174 globular clusters. The clusters have projected galactocentric distances in the range 4 to 70 kpc, the overwhelming majority lie within 30 kpc. We find some indication for a rotation of the red (metal-rich) clusters about the minor axis. Out to a radius of 30 kpc, we find a roughly constant projected velocity dispersion for the blue clusters of ~200 km/s. The red clusters exhibit a distinctly different behavior: at a radius of about 13 kpc, the velocity dispersion drops by ~50 km/s to about 170 km/s which then remains constant out to a radius of 30 kpc. Using only the blue clusters as dynamical tracers, we perform Jeans-analyses for different assumptions of the orbital anisotropy. Depending on the anisotropy and the adopted M/L-values, we find that the dark matter fraction within one effective radius can vary between 20% and 50% with most a probable range between 20% and 30%. A main source of uncertainty is the ambiguity of the velocity dispersion in the outermost bin. Although the dark halo mass still cannot be strongly constrained, NGC 4636 does not seem to be extremely dark matter dominated. The derived circular velocities are also consistent with Modified Newtonian Dynamics.
description: 19 pages, 18 figures. Accepted for publication in A&A. Appendix A (velocity tables) will be published in the online version of the journal
Thermodynamically consistent model for poroelastic rocks towards tectonic and volcanic processes and earthquakes
Creators: name: Roubíček, Tomáš
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences
subject: 74L05, 86A04, 35Q86

description: A general-purpose model combining concepts from rational continuum mechanics, fracture and damage mechanics, plasticity, and poromechanics is devised in Eulerian coordinates, involving objective time derivatives. The model complies with mass, momentum, and energy conservation as well as entropy inequality and objectivity. It is devised to cover many diverse phenomena, specifically rupture of existing lithospheric faults, tectonic earthquakes, generation and propagation of seismic waves, birth of new tectonic faults, or volcanic activity, aseismic creep, folding of rocks, aging of rocks, long-distance saturated water transport and flow in poroelastic rocks, melting of rocks and formation of magma chambers, or solidification of magma.
description: To appear in Geophys. J. Intl
Axion/Hidden-Photon Dark Matter Conversion into Condensed Matter Axion
Creators: name: Chigusa, So
name: Moroi, Takeo
name: Nakayama, Kazunori
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The QCD axion or axion-like particles are candidates of dark matter of the universe. On the other hand, axion-like excitations exist in certain condensed matter systems, which implies that there can be interactions of dark matter particles with condensed matter axions. We discuss the relationship between the condensed matter axion and a collective spin-wave excitation in an anti-ferromagnetic insulator at the quantum level. The conversion rate of the light dark matter, such as the elementary particle axion or hidden photon, into the condensed matter axion is estimated for the discovery of the dark matter signals.
description: 32 pages, 3 figures
State-space aerodynamic model reveals high force control authority and predictability in flapping flight
Creators: name: Bayiz, Yagiz E.
name: Cheng, Bo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Robotics (cs.RO)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Flying animals resort to fast, large-degree-of-freedom motion of flapping wings, a key feature that distinguishes them from rotary or fixed-winged robotic fliers with limited motion of aerodynamic surfaces. However, flapping-wing aerodynamics are characterised by highly unsteady and three-dimensional flows difficult to model or control, and accurate aerodynamic force predictions often rely on expensive computational or experimental methods. Here, we developed a computationally efficient and data-driven state-space model to dynamically map wing kinematics to aerodynamic forces/moments. This model was trained and tested with a total of 548 different flapping-wing motions and surpassed the accuracy and generality of the existing quasi-steady models. This model used 12 states to capture the unsteady and nonlinear fluid effects pertinent to force generation without explicit information of fluid flows. We also provided a comprehensive assessment of the control authority of key wing kinematic variables and found that instantaneous aerodynamic forces/moments were largely predictable by the wing motion history within a half-stroke cycle. Furthermore, the angle of attack, normal acceleration, and pitching motion had the strongest effects on the aerodynamic force/moment generation. Our results show that flapping flight inherently offers high force control authority and predictability, which can be key to developing agile and stable aerial fliers.
description: 10 pages, 5 figures. Supplementary Materials can be found here: https://doi.org/10.6084/m9.figshare.c.5527155
Theory of Electromagnetic Wave Transmission through Metallic Gratings of Subwavelength Slits
Creators: name: Garcia, N.
name: Nieto-Vesperinas, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present FDTD calculations for transmission of light and other electromagnetic waves through periodic arrays of slits in a metallic slab. The results show resonant, frequency dependent, transmittance peaks for subwavelength widths of the slits which can be up to a factor of ten with respect to those out of resonance. Although our conclusions agree with previous work by Lezec and Thio as regards both the magnitude of the enhancement and the lack of contribution of surface plasmon polaritons of the metal surface to this effect, we derive an interpretation from a theory that deals with emerging beam- Rayleigh anomalies of the grating, and with Fabry-Perot resonances of the perforated slab considered as an effective medium.
description: 12 pages 3 figures
Experimental observation of the avoided crossing of two $S$-matrix resonance poles in an ultracold atom collider
Creators: name: Chilcott, Matthew
name: Thomas, Ryan
name: Kjærgaard, Niels
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In quantum mechanics, collisions between two particles are captured by a scattering matrix which describes the transfer from an initial entrance state to an outgoing final state. Analyticity of the elements of this $S$-matrix enables their continuation onto the complex energy plane and opens up a powerful and widely used framework in scattering theory, where bound states and scattering resonances for a physical system are ascribed to $S$-matrix poles. In the Gedankenexperiment of gradually changing the potential parameters of the system, the complex energy poles will begin to move, and in their ensuing flow, two poles approaching will interact. An actual observation of this intriguing interaction between scattering poles in a collision experiment has, however, been elusive. Here, we expose the interplay between two scattering poles relating to a shape resonance and a magnetically tunable Feshbach resonance by studying ultracold atoms with a laser-based collider. We exploit the tunability of the Feshbach resonance to observe a compelling avoided crossing of the poles in their energies which is the hallmark of a strongly coupled system.
description: for a movie of the flowing poles and their imprint on the scattering cross section, see https://www.physics.otago.ac.nz/data/nk/files/AnaCont.mp4
Constraint Damping in First-Order Evolution Systems for Numerical Relativity
Creators: name: Owen, Robert
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A new constraint suppressing formulation of the Einstein evolution equations is presented, generalizing the five-parameter first-order system due to Kidder, Scheel and Teukolsky (KST). The auxiliary fields, introduced to make the KST system first-order, are given modified evolution equations designed to drive constraint violations toward zero. The algebraic structure of the new system is investigated, showing that the modifications preserve the hyperbolicity of the fundamental and constraint evolution equations. The evolution of the constraints for pertubations of flat spacetime is completely analyzed, and all finite-wavelength constraint modes are shown to decay exponentially when certain adjustable parameters satisfy appropriate inequalities. Numerical simulations of a single Schwarzschild black hole are presented, demonstrating the effectiveness of the new constraint-damping modifications.
description: 11 pages, 5 figures
Διαπροσωπικές σχέσεις μεταξύ γηγενών και αλλοδαπών μαθητών/τριών στο δημοτικό σχολείο: μία μελέτη περίπτωσης
Creators: name: Γουνοπούλου, Ειρήνη-Ευσταθία Χαραλάμπους
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Διαπροσωπικές σχέσεις
Γηγενείς μαθητές/τριες
Αλλοδαποί μαθητές/τριες
Interpersonal relationnships
Native students
Foreign students

description: Σκοπός της μεταπτυχιακής εργασίας ήταν η μελέτη των διαπροσωπικών σχέσεων μεταξύ των γηγενών και αλλοδαπών μαθητών/τριών που αναπτύσσονται στο δημοτικό σχολείο. Αρχικά, έγινε προσπάθεια πλαισίωσης και ερμηνείας των όρων που σχετίζονται με την έννοια των διαπροσωπικών σχέσεων, ενώ σε δεύτερο επίπεδο αναζητήθηκε η πιθανή κατάσταση που δημιουργούν οι διαπροσωπικές σχέσεις μεταξύ των γηγενών και των πολιτισμικά διαφορετικών μαθητών/τριών. Έτσι, αναζητήθηκαν στη βιβλιογραφία όροι και καταστάσεις που θεωρείται ότι συνάδουν με το είδος των διαπροσωπικών σχέσεων που δημιουργούνται κατά τη διάρκεια του μαθήματος. Για τη στήριξη της έρευνας σχεδιάστηκε και χορηγήθηκε ερωτηματολόγιο σε δύο διαφορετικά δημοτικά σχολεία της Θεσσαλονίκης, το οποίο συμπληρώθηκε από μαθητές της ε και στ δημοτικού. Στο τέλος παρουσιάστηκαν διεξοδικά τα αποτελέσματα της έρευνας και ακολούθησε η σχετική συζήτηση των συμπερασμάτων που προέκυψαν
description: The aim of the postgraduate work was to study the interpersonal relationships between native and foreign pupils which are developing in elementary school. Initially, an attempt was made to frame and interpret the terms related to the concept of interpersonal relations, while secondly the potential situation created by interpersonal relationships between native and culturally different students was investigated. Thus, in the literature, terms and situations that are considered to be in line with the type of interpersonal relationships created during the course were searched. In order to support the research, a questionnaire was designed and submitted to two different elementary schools in Thessaloniki, supplemented by pupils of the two last classes of the elementary school. Finally, the results of the survey were presented in detail, followed by the discussion of the conclusions that emerged
Change in the adiabatic invariant in a nonlinear two-mode model of Feshbach resonance passage
Creators: name: Itin, A. P.
name: Vasiliev, A. A.
name: Watanabe, S.
name: Krishna, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Mean-field approach has recently been used to model coupled atom-molecular Bose-Einstein condensates (BEC) and coupled Fermi-Bose condensates near Feshbach resonance. Sweeping of magnetic field across the resonance gives a new (nonlinear) version of Landau-Zener problem. We investigate the structure of the corresponding classical phase space and calculate change in the action which corresponds to finite-rate efficiency of the sweep. We consider the case of non-zero initial action, which corresponds to some finite initial molecular fraction.
description: 17 pages, 4 figures
Molecular understanding of cytoneme-based Wnt trafficking
Creators: name: Mattes, Benjamin
Publisher: name: Karlsruhe
Year: 2019
Subjects: Wnt
Signalling
Zebrafish development
Cytoneme
Signalling filopodia
Ror2

description: Cell-to-cell communication by signaling proteins is essential to orchestrate development and tissue homeostasis in all multicellular organisms. The highly conserved family of Wnt proteins are important guiding cues to control these processes. Fundamental to this complex signaling network are relatively small and defined signaling centers in a given tissue that produce and distribute Wnt proteins. Adjacent, larger groups of cells respond to these spatial and temporal information in a concentration-dependent manner and adjust their transcriptional program. However, a regulated sequence of morphogen activity is required to generate a fine tuned communication network. Therefore, a controlled propagation machinery must ensure accurate signal distribution from the source to the surrounding tissue to initiate the correct developmental path. In this thesis, I consolidated the knowledge of the molecular machinery controlling cytoneme formation in zebrafish development. I expanded this principle to other aspects of Wnt signaling such as cancer growth and tissue homeostasis. Via a screening approach, I identified the receptor tyrosine kinase Ror2 as a promoting factor for cellular protrusions in general and particularly for Wnt8a cytonemes in cultured cells and in vivo. Consistently, I described the novel ligand-receptor pair Wnt8a and Ror2 by measuring the affinity for membrane accumulations and by biophysical imaging applications such as fluorescence correlation spectroscopy. Subsequently, functional interaction and transduction of the Wnt/PCP pathway was demonstrated during zebrafish convergence and extension and during non-canonical reporter activation in Xenopus. Wnt8a and Ror2 are considered to act in mutually repressive pathways, although the autocrine interplay for cytoneme formation to facilitate paracrine Wnt/β-catenin dissemination seems to be conserved. Thus, the model can be applied to other systems: The transcriptional β-catenin level and resulting proliferation of gastric cancer cells can be regulated by Ror2, thereby only disrupting the signal transmitting transport machinery in the source cells. Furthermore, I provided evidence of an ex vivo human stem cell organoid system, where growth and survival require cytoneme-mediated Wnt proteins from isolated myofibroblasts. Remarkably, this setup resembles an innovative approach for stem cell maintenance in the murine intestinal crypt and expands the potential roles of cytonemes in development, tissue homeostasis and diseases.
Story about Verdena's cat
Creators: name: Parker, Verdena
name: Campbell, Amy
name: Escamilla, Ramón
name: Newbold, Lindsey
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: hup

description: Audio file VP-111107-02: Story about Verdena's cat, told in Hupa and then in English.
Μετάφραση αποσπασμάτων του δοκιμίου «Entre théâtre et performance : la question du texte » του Joseph Danan
Creators: name: Μανιάτη, Ελένη Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: περφόρμανς
παραστατικές τέχνες
επιτελεστική τέχνη
Performance
performing arts
performance art

description: Η παρούσα διπλωματική εργασία αποτελεί σχολιασμένη μετάφραση μέρους της εισαγωγής του βιβλίου «Entre théâtre et performance : la question du texte» του Joseph Danan. Με αφορμή την συνεχώς αυξανόμενη παρουσία του όρου performance στα θεατρικά ζητήματα, ο θεατρολόγος Joseph Danan επιχειρεί να προσδιορίσει τι είναι η performance και διερευνά την θέση που κατέχει το δραματικό κείμενο στο συγκεκριμένο καλλιτεχνικό είδος. Μετά τη σύντομη εισαγωγή σχετικά με το είδος της performance, παρατίθεται το πρωτότυπο κείμενο και η μετάφραση από το έργο του Joseph Danan σε αντιστοιχία και το γλωσσάρι που αποτελείται από 30 όρους. Ακολουθεί η τεκμηρίωση των όρων με παραδείγματα και ορισμούς σε ελληνικά και γαλλικά, καθώς και η παρουσίαση των σταδίων της ορολογικής έρευνας. Στην συνέχεια παρουσιάζεται η κειμενογλωσσική ανάλυση και οι μεταφραστικές δυσκολίες που προέκυψαν κατά την μετάφραση. Στο τέλος παρατίθενται τα συμπεράσματα που προέκυψαν καθώς και η βιβλιογραφία που χρησιμοποιήθηκε για την εκπόνηση της εργασίας
description: This thesis is an annotated translation of two excerpts of Joseph Danan’s book “Entre théâtre et performance: la question du texte”. Due to the increasing use of the term “performance” in theatre studies, the dramaturge Joseph Danan attempts to define this term and to explore the role of the dramatic text in this particular form of artistic expression. This thesis starts out by outlining the theoretical background of the text, focusing on the history of performance. The original text is presented opposite of its translation; then follows the glossary and the terminology documentation. Difficulties and problems encountered during this translation come next, along with how they were addressed; the epilogue follows last along with the bibliography
On the complexity theory of switching networks
Creators: name: Lin, Geng
Publisher: name: University of British Columbia
Year: 2008

description: Fast and efficient communications are essential to the success of large-scale multiprocessor parallel processing systems, distributed processing systems, and telecommunication systems. Switching networks are constructed to support simultaneous communications (of data, voice, image and video) in these systems. This thesis focuses on the complexity theory for the construction of switching networks, with primary emphasis on (a) the complexity of the networks, as measured by the size (number of switches), the depth (largest number of switches on any communication path) and the degree (the largest fan-out of a switch); (b) the complexity of the routing algorithms of the networks, as measured by the time and space; and (c) the fault-tolerance of the networks. We present the first simultaneous "weakly optimal" solutions for the explicit construction of non-blocking networks, and the design of the parallel routing algorithms. "Weakly optimal" here means that all measures of complexity (size and depth of the network, time for the algorithm, and space for the data-structure) are within one or more logarithmic factors of their smallest possible values. We also consider routing algorithms for networks with probabilistic traffic. We present an optimal routing algorithm for series-parallel networks (which includes a broad range of useful connection networks for parallel architectures, e.g., butterflies and Bend networks).The algorithm has an asymptotically minimum expected time among all routing algorithms. We consider fault-tolerant switching networks under a random switch-failure model. We prove lower bounds for the size and depth of fault-tolerant non-blocking networks, rearrangeable networks and superconcentrators. And we explicitly construct such networks with optimal sizes and depths. We also consider fault-tolerant planar switching networks, which become attractive because of the rapid advances in VLSI technology. We prove lower bounds for the degrees of vertices of fault-tolerant planar rearrangeable networks and superconcentrators. We construct such fault-tolerant planar networks with optimal sizes and degrees.
The Lyman-alpha forest and WMAP year three
Creators: name: Viel, Matteo
name: Haehnelt, Martin G.
name: Lewis, Antony
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A combined analysis of Cosmic Microwave Background (CMB) and Lyman-a forest data allows to constrain the matter power spectrum from small scales of about 1 Mpc/h all the way to the horizon scale. The long lever arm and complementarity provided by such an analysis has previously led to a significant tightening of the constraints on the shape and the amplitude of the power spectrum of primordial density fluctuations. We present here a combined analysis of the WMAP three year results with Lyman-a forest data. The amplitude of the matter power spectrum sigma_8 and the spectral index ns inferred from the joint analysis with high resolution Lyman-a forest data and low resolution Lyman-a forest data as analyzed by Viel & Haehnelt (2006) are consistent with the new WMAP results to within 1 sigma. The joint analysis with the mainly low resolution data as analysed by McDonald et al. (2005) suggests a value of sigma_8 which is ~ 2 sigma higher than that inferred from the WMAP three year data alone. The joint analysis of the three year WMAP and the Lyman-a forest data also does not favour a running of the spectral index. The best fit values for a combined analysis of the three year WMAP data, other CMB data, 2dF and the Lyman-a forest data are (sigma_8, ns) = (0.78\pm 0.03,0.96 \pm 0.01).
description: 5 pages, 4 figs, 2 tables. MNRAS letters in press
Bers isomorphism on the universal Teichmüller curve
Creators: name: Teo, Lee-Peng
Publisher: name: arXiv
Year: 2006
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: Primary 30F60, Secondary 32G15

description: We study the Bers isomorphism between the Teichmüller space of the parabolic cyclic group and the universal Teichmüller curve. We prove that this is a group isomorphism and its derivative map gives a remarkable relation between Fourier coefficients of cusp forms and Fourier coefficients of vector fields on the unit circle. We generalize the Takhtajan-Zograf metric to the Teichmüller space of the parabolic cyclic group, and prove that up to a constant, it coincides with the pull back of the Velling-Kirillov metric defined on the universal Teichmüller curve via the Bers isomorphism.
description: 11 pages
Nonperturbative dynamics in the colour-magnetic QCD vacuum
Creators: name: Nefediev, A. V.
name: Simonov, Yu. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the deconfinement phase of QCD quarks and gluons interact with the dense stochastic colour-magnetic vacuum. We consider the dynamics of quarks in this deconfinement phase using the Field Correlators Method and derive an effective nonperturbative inter-quark potential, in addition to the usual perturbative short-ranged interaction. We find the resulting angular-momentum-dependent interaction to be attractive enough to maintain bound states and, for light quarks (and gluons), to cause emission of quark and gluon pairs. Possible consequences for the strong interacting quark--gluon plasma are briefly discussed.
description: LaTeX2e, 12 pages
Quantifying quantum coherence in polariton condensates
Creators: name: Lüders, Carolin
name: Pukrop, Matthias
name: Rozas, Elena
name: Schneider, Christian
name: Höfling, Sven
name: Sperling, Jan
name: Schumacher, Stefan
name: Aßmann, Marc
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically and experimentally investigate quantum features of an interacting light-matter system from a multidisciplinary perspective, unifying approaches from semiconductor physics, quantum optics, and quantum information science. To this end, we quantify the amount of quantum coherence that results from the quantum superposition of Fock states, constituting a measure of the resourcefulness of the produced state for modern quantum protocols. As an archetypal example of a hybrid light-matter interface, we study a polariton condensate and implement a numerical model to predict its properties. Our simulation is confirmed by our proof-of-concept experiment in which we measure and analyze the phase-space distributions of the emitted light. Specifically, we drive a polariton microcavity across the condensation threshold and observe the transition from an incoherent thermal state to a coherent state in the emission, thus confirming the build-up of quantum coherence in the condensate itself.
description: 10 figures, 15 pages
Quantum Crystals and Spin Chains
Creators: name: Dijkgraaf, Robbert
name: Orlando, Domenico
name: Reffert, Susanne
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this note, we discuss the quantum version of the melting crystal corner in one, two, and three dimensions, generalizing the treatment for the quantum dimer model. Using a mapping to spin chains we find that the two--dimensional case (growth of random partitions) is integrable and leads directly to the Hamiltonian of the Heisenberg XXZ ferromagnet. The three--dimensional case of the melting crystal corner is described in terms of a system of coupled XXZ spin chains. We give a conjecture for its mass gap and analyze the system numerically.
description: 34 pages, 26 pictures
Wallpaper Texture Generation and Style Transfer Based on Multi-label Semantics
Creators: name: Gao, Ying
name: Feng, Xiaohan
name: Zhang, Tiange
name: Rigall, Eric
name: Zhou, Huiyu
name: Qi, Lin
name: Dong, Junyu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Textures contain a wealth of image information and are widely used in various fields such as computer graphics and computer vision. With the development of machine learning, the texture synthesis and generation have been greatly improved. As a very common element in everyday life, wallpapers contain a wealth of texture information, making it difficult to annotate with a simple single label. Moreover, wallpaper designers spend significant time to create different styles of wallpaper. For this purpose, this paper proposes to describe wallpaper texture images by using multi-label semantics. Based on these labels and generative adversarial networks, we present a framework for perception driven wallpaper texture generation and style transfer. In this framework, a perceptual model is trained to recognize whether the wallpapers produced by the generator network are sufficiently realistic and have the attribute designated by given perceptual description; these multi-label semantic attributes are treated as condition variables to generate wallpaper images. The generated wallpaper images can be converted to those with well-known artist styles using CycleGAN. Finally, using the aesthetic evaluation method, the generated wallpaper images are quantitatively measured. The experimental results demonstrate that the proposed method can generate wallpaper textures conforming to human aesthetics and have artistic characteristics.
description: IEEE Transactions on Circuits and Systems for Video Technology
Μηχανισμοί ανάδειξης της ετερότητας μέσα από την εφηβική λογοτεχνία του 21ου αιώνα-μία συγκριτική έρευνα
Creators: name: Δημητρακοπούλου, Μαρία Ελευθερίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2019
Subjects: Ετερότητα
Ταυτότητα
Εφηβική Λογοτεχνία
Diversity
Identity
Young adult literature

description: Αναμφισβήτητα, η λογοτεχνία αποτελεί αναπόσπαστο κομμάτι της ταυτότητας και σημαντικό μέσο διαμόρφωσης της. Επιπλέον, η λογοτεχνία είναι ένας τρόπος με τον οποίο αντιλαμβάνεται κανείς την ετερότητα. Οι τρόποι με τους οποίους η λογοτεχνική αφήγηση αντιμετωπίζει τα θέματα ταυτότητας, ετερότητας, της ομοιότητας και της διαφοράς, του Εαυτού και του Άλλου, συνδέονται άμεσα με τις εκάστοτε κοινωνικές συνθήκες. Ταυτόχρονα, μολονότι σε Ευρώπη και Αμερική υπάρχουν πολλές βιβλιογραφικές ανασκοπήσεις και έρευνες για την εφηβική λογοτεχνία, στην Ελλάδα γίνεται ακόμη μεγάλη προσπάθεια για θεωρητική διάκριση και ποιοτική κατηγοριοποίηση, με αποτέλεσμα να μην έχει διευκρινιστεί πλήρως η κατηγορία αυτή. Οι δύο παραπάνω παραδοχές έδωσαν το έναυσμα για την εκπόνηση της παρούσας διπλωματικής εργασίας. Στην παρούσα μελέτη, λοιπόν, πραγματοποιείται μια προσπάθεια εντοπισμού των μηχανισμών εκείνων που αναδεικνύουν την ταυτότητα και την ετερότητα, δηλαδή τους τρόπους διαφοροποίησης του Άλλου από το Εγώ μέσα από τα σύγχρονα εφηβικά λογοτεχνικά κείμενα που επιλέχθηκαν. Πέρα από τις διαφορές και τις ομοιότητες των λογοτεχνικών κειμένων υπό εξέταση, η έρευνα έδειξε πως αυτό που επιδιώκεται κατά κύριο λόγο είναι η δημιουργία ανθρώπων που σέβονται την ετερότητα και τη διαφορετικότητα αναδεικνύοντας την έτσι, ώστε να ευαισθητοποιηθούν οι αναγνώστες και να δημιουργηθεί μια πολυπολιτισμική κοινωνία που θεωρεί όλους τους ανθρώπους ισότιμους
description: Undoubtedly, literature is an integral part of identity and an important means of shaping it. In addition, literature is a way of perceiving diversity. The ways in which literary narrative addresses the issues of identity, otherness, resemblance and difference, of the Self and of the Other, are directly linked to the social context of the individual. At the same time, although there are many bibliographic reviews and researches on teenage literature in Europe and America, in Greece there is still a great deal of effort in theoretical distinction and qualitative categorization, with the result that this category has not been fully clarified. The above two assumptions set the stage for the preparation of this thesis. In the present study, therefore, an attempt is made to identify those mechanisms that promote identity and heterogeneity, that is, the ways in which the Other is differentiated from the Ego through the contemporary adolescent literary texts selected. In addition to the differences and similarities of the literary texts under consideration, research has shown that what is primarily sought is to create people who respect diversity, in order to raise awareness and create a multicultural society that considers all people equal
Dunia dalam Skema Volume 1
Creators: name: Huda, Sokhi
Publisher: name: Zenodo
Year: 2021
Subjects: Dunia
Skema

description: Slide presentasi volume 1 ini merupakan koleksi 24 skema dari 14 artikel dan paper konferensi. Koleksi ini penulis sengaja beri judul “Dunia dalam Skema” untuk memudahkan identifikasi keunikan gagasan. Argumen yang dibangun adalah penjelasan ilmiah tentang dunia dapat disederhanakan secara sistematis kedalam bentuk skema. Setiap bagian (part) diawali oleh identitas karya dan nice point. Nice point (NP) merupakan deskripsi singkat dan reflektif terhadap hasil kajian atau penelitian tertentu. Kemasan bahasanya efisien dan efektif dengan diksi terpenting yang ingin diberikan oleh peneliti. NP memperlihatkan kekayaan diksi, keluasan wawasan baca, penguasaan hasil penelitian, sekaligus kemampuan daya refleksi seorang penulis. Dengan kondisi ini, NP seperti untaian mutiara dalam keutuhan gagasan penulis tentang suatu persoalan. Enable GingerCannot connect to Ginger Check your internet connection
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A simple analysis of halo density profiles using gravitational lensing time delays
Creators: name: Dobke, Benjamin M.
name: King, Lindsay J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Gravitational lensing time delays depend upon the Hubble constant and the density distribution of the lensing galaxies. This allows one to either model the lens and estimate the Hubble constant, or to use a prior on the Hubble constant from other studies and investigate what the preferred density distribution is. Some studies have required compact dark matter halos (constant M/L ratio) in order to reconcile gravitational lenses with the HST/WMAP value of the Hubble constant (72 +/- 8 km/s /Mpc and 72 +/- 5 km/s /Mpc, respectively). This is in direct contradiction with X-ray, stellar dynamical, and weak lensing studies, which all point towards extended halos and isothermal density profiles. In this work, we examine an up-to-date sample of 13 lensing galaxies resulting in a data set consisting of 21 time delays. We select systems in which there is a single primary lensing galaxy (e.g. excluding systems undergoing mergers). Analysis is performed using analytic models based upon a powerlaw density profile (rho \propto r^-n) of which the isothermal profile is a special case (n = 2). This yields a value of n = 2.11+/-0.12 (3sigma) for the mean profile when modeling with a prior on the Hubble constant, which is only consistent with isothermality within 3 sigma. Note that this is a formal error from our calculations, and does not include the impact of sample selection or simplifications in the lens modeling. We conclude that time delays are a useful probe of density profiles, in particular as a function of the environment in which the lens resides, when combined with a prior on the Hubble constant.
description: A&A accepted