cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Variational approximations to exact solutions in shell-model valence spaces: systematic calculations in the $sd$-shell
Creators: name: Sánchez-Fernández, Adrián
name: Bally, Benjamin
name: Rodríguez, Tomás R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study the ability of variational approaches based on self-consistent mean-field and beyond-mean-field methods to reproduce exact energies and electromagnetic properties of the nuclei defined within the $sd$-shell valence space using the non-trivial USD Hamiltonian. In particular, Hartree-Fock-Bogoliubov (HFB), variation after particle-number projection (VAPNP) and projected generator coordinate methods (PGCM) are compared to exact solutions {obtained by} the full diagonalization of the Hamiltonian. We analyze the role played by the proton-neutron ($pn$) mixing as well as the quadrupole and pairing degrees of freedom (including both isoscalar and isovector channels) in the description of the spectra of even-even, even-odd and odd-odd nuclei in the whole $sd$-shell.
description: 16 pages; 16 figures
Borneque, Xavier
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1830

description: Ort: Pont d'Ables
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
André & Cottier
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1830

description: Ort: Paris
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Burckhardt-Iselin, Jeremias
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1830

description: Ort: Basel
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
3-D climate simulations for the detectability of Proxima Centauri b
Creators: name: Galuzzo, Daniele
name: Cagnazzo, Chiara
name: Berrilli, Francesco
name: Fierli, Federico
name: Giovannelli, Luca
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The discovery of a planet orbiting around Proxima Centauri, the closest star to the Sun, opens new avenues for the remote observations of the atmosphere and surface of an exoplanet, Proxima b. To date, three-dimensional (3D) General Circulation Models (GCMs) are the best available tools to investigate the properties of the exo-atmospheres, waiting for the next generation of space and groundbased telescopes. In this work, we use the PlanetSimulator (PlaSim), an intermediate complexity 3D GCM, a flexible and fast model, suited to handle all the orbital and physical parameters of a planet and to study the dynamics of its atmosphere. Assuming an Earth-like atmosphere and a 1:1 spin/orbit configuration (tidal locking), our simulations of Proxima b are consistent with a day-side open ocean planet with a superrotating atmosphere. Moreover, because of the limited representation of the radiative transfer in PlaSim, we compute the spectrum of the exoplanet with an offline Radiative Transfer Code with a spectral resolution of 1 nm. This spectrum is used to derive the thermal phase curves for different orbital inclination angles. In combination with instrumental detection sensitivities, the different thermal phase curves are used to evaluate observation conditions at ground level (e.g., ELT) or in space (e.g., JWST). We estimated the exposure time to detect Proxima b (assuming an Earth-like atmosphere) thermal phase curve in the FIR with JWST with signal-to-noise ratio $\simeq$1. Under the hypothesis of total noise dominated by shot noise, neglecting other possible extra contribution producing a noise floor, the exposure time is equal to 5 hours for each orbital epoch.
description: 21 pages, 11 figures, accepted in the Astrophysical Journal
Pogonatum nudiusculum Mitt.
Creators: name: Zhao, Wei
name: Wang, Zhaoming
name: Zheng, Lina
name: Naren, Gaowa
name: He, Qiang
name: Han, Wei
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Plantae
Bryophyta
Bryopsida
Polytrichales
Polytrichaceae
Pogonatum
Pogonatum nudiusculum

description: Pogonatum nudiusculum Mitt.
Distribution
China, Nepal, Bhutan, India, Sri Lanka and the Philippines (Wu and Jia 2004).
description: Published as part of Zhao, Wei, Wang, Zhaoming, Zheng, Lina, Naren, Gaowa, He, Qiang & Han, Wei, 2024, A step forward in botanical exploration with three new Polytrichaceae records from Tibet, China, pp. e 133971 in Biodiversity Data Journal 12 on page e133971, DOI: 10.3897/BDJ.12.e133971
Analytical Solution of Similar Oblate Spheroidal Coordinate System
Creators: name: Strunz, Pavel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Satisfactory description of gravitational and gravity potentials is needed for a proper modelling of a wide spectrum of physical problems on various size scales, ranging from atmosphere dynamics up to the movements of stars in a galaxy. In certain cases, Similar Oblate Spheroidal (SOS) coordinate system can be of advantage for such modelling tasks, mainly inside or in the vicinity of oblate spheroidal objects (planets, stars, galaxies). Although the solution of the relevant expressions for the SOS system cannot be written in a closed form, it can be derived as analytical expressions -- convergent infinite power series. Explicit analytical expressions for the Cartesian coordinates in terms of the curvilinear Similar Oblate Spheroidal coordinates are derived in the form of infinite power series with generalized binomial coefficients. The corresponding partial derivatives are found in a suitable form, further enabling derivation of the metric scale factors necessary for differential operations. The terms containing derivatives of the metric scale factors in the velocity advection term of the momentum equation in SOS coordinate system are expressed. The Jacobian determinant is derived as well. The presented analytical solution of SOS coordinate system solution is a tool applicable for a broad variety of objects exhibiting density, gravity or gravitation levels resembling similar oblate spheroids. Such objects range from the bodies with small oblateness (the Earth itself on the first place), through elliptical galaxies up to significantly flattened objects like disk galaxies.
description: 42 pages, 5 Postscript figures
Measuring the magnetic origins of solar flares, CMEs and Space Weather
Creators: name: Judge, Philip
name: Rempel, Matthias
name: Ezzeddine, Rana
name: Kleint, Lucia
name: Egeland, Ricky
name: Berdyugina, Svetlana
name: Berger, Thomas
name: Burkepile, Joan
name: Centeno, Rebecca
name: de Toma, Giuliana
name: Dikpati, Mausumi
name: Fan, Yuhong
name: Gilbert, Holly
name: Lacatus, Daniela
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We take a broad look at the problem of identifying the magnetic solar causes of space weather. With the lackluster performance of extrapolations based upon magnetic field measurements in the photosphere, we identify a region in the near UV part of the spectrum as optimal for studying the development of magnetic free energy over active regions. Using data from SORCE, Hubble Space Telescope, and SKYLAB, along with 1D computations of the near-UV (NUV) spectrum and numerical experiments based on the MURaM radiation-MHD and HanleRT radiative transfer codes, we address multiple challenges. These challenges are best met through a combination of near UV lines of bright \ion{Mg}{2}, and lines of \ion{Fe}{2} and \ion{Fe}{1} (mostly within the $4s-4p$ transition array) which form in the chromosphere up to $2\times10^4$ K. Both Hanle and Zeeman effects can in principle be used to derive vector magnetic fields. However, for any given spectral line the $τ=1$ surfaces are generally geometrically corrugated owing to fine structure such as fibrils and spicules. By using multiple spectral lines spanning different optical depths, magnetic fields across nearly-horizontal surfaces can be inferred in regions of low plasma $β$, from which free energies, magnetic topology and other quantities can be derived. Based upon the recently-reported successful suborbital space measurements of magnetic fields with the CLASP2 instrument, we argue that a modest space-borne telescope will be able to make significant advances in the attempts to predict solar eruptions. Difficulties associated with blended lines are shown to be minor in an Appendix.
description: Accepted in ApJ, V2 fixed author spelling error
Formational bounds of link prediction in collaboration networks
Creators: name: Kim, Jinseok
name: Diesner, Jana
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: Link prediction in collaboration networks is often solved by identifying structural properties of existing nodes that are disconnected at one point in time, and that share a link later on. The maximally possible recall rate or upper bound of this approach's success is capped by the proportion of links that are formed among existing nodes embedded in these properties. Consequentially, sustained ties as well as links that involve one or two new network participants are typically not predicted. The purpose of this study is to highlight formational constraints that need to be considered to increase the practical value of link prediction methods for collaboration networks. In this study, we identify the distribution of basic link formation types based on four large-scale, over-time collaboration networks, showing that current link predictors can maximally anticipate around 25% of links that involve at least one prior network member. This implies that for collaboration networks, increasing the accuracy of computational link prediction solutions may not be a reasonable goal when the ratio of collaboration ties that are eligible to the classic link prediction process is low.
description: 22 pages
Against `Realism'
Creators: name: Norsen, Travis
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We examine the prevalent use of the phrase ``local realism'' in the context of Bell's Theorem and associated experiments, with a focus on the question: what exactly is the `realism' in `local realism' supposed to mean? Carefully surveying several possible meanings, we argue that all of them are flawed in one way or another as attempts to point out a second premise (in addition to locality) on which the Bell inequalities rest, and (hence) which might be rejected in the face of empirical data violating the inequalities. We thus suggest that the phrase `local realism' should be banned from future discussions of these issues, and urge physicists to revisit the foundational questions behind Bell's Theorem.
description: Revised version, forthcoming in Foundations of Physics
Simple vacuum probe station for optoelectronic measurements
Creators: name: Carrascoso, Felix
name: Pucher, Thomas
name: Castellanos-Gomez, Andres
Publisher: name: Zenodo
Year: 2025

description: We present a home-built vacuum probe station designed for optoelectronic measurements. An overview sketch of the system can be found below. We use a big feedthrough collar and equip it with a magnetic table that can hold four custom built probes on micromanipulator stages. Electrical access to the chamber is provided by BNC connectors. Optical access is provided by a borosilicate window in the lid of the chamber. A fiber-coupled tube lens allows sample illumination with any fiber-coupled light source.
Search for an infrared counterpart of IGR J16358-4756
Creators: name: D'Amico, Flavio
name: Jablonski, Francisco
name: Rodrigues, Claudia V.
name: Cieslinski, Deonisio
name: Hickel, Gabriel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report here on near infrared observations of the field around IGR J16358-4756. The source belongs to the new class of highly absorbed X-ray binaries discovered by IBIS/INTEGRAL. Our primary goal was to identify the infrared counterpart of the source, previously suggested to be a LMXB and then further reclassified as a HMXB. We have made use of Chandra observations of the source in order to better constrain the number of possible counterparts. Using the differential photometry technique, in observations spanning a timescale of 1 month, we found no long term variability in our observations. This is compatible, and we suggest here, that the source is a HMXB.
description: 5 pages, 2 figures, all styles included; to be published in: "The Transient Milky Way: a perspective for MIRAX", eds. F. D'Amico, J. Braga, and R. E. Rothschild, AIP Conference Proceedings
Spin relaxation at the singlet-triplet crossing in a quantum dot
Creators: name: Golovach, Vitaly N.
name: Khaetskii, Alexander
name: Loss, Daniel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study spin relaxation in a two-electron quantum dot in the vicinity of the singlet-triplet crossing. The spin relaxation occurs due to a combined effect of the spin-orbit, Zeeman, and electron-phonon interactions. The singlet-triplet relaxation rates exhibit strong variations as a function of the singlet-triplet splitting. We show that the Coulomb interaction between the electrons has two competing effects on the singlet-triplet spin relaxation. One effect is to enhance the relative strength of spin-orbit coupling in the quantum dot, resulting in larger spin-orbit splittings and thus in a stronger coupling of spin to charge. The other effect is to make the charge density profiles of the singlet and triplet look similar to each other, thus diminishing the ability of charge environments to discriminate between singlet and triplet states. We thus find essentially different channels of singlet-triplet relaxation for the case of strong and weak Coulomb interaction. Finally, for the linear in momentum Dresselhaus and Rashba spin-orbit interactions, we calculate the singlet-triplet relaxation rates to leading order in the spin-orbit interaction, and find that they are proportional to the second power of the Zeeman energy, in agreement with recent experiments on triplet-to-singlet relaxation in quantum dots.
description: 29 pages, 14 figures, 1 table
Λόγος παρηγορητικός περί δυστυχίας και ευτυχίας
Creators: name: Πολίτη, Μαρία Λ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Σπυρίδων, Λάμπρος
Λειψία
Leipziq
Spyridon, Lampros

description: Με τον Λόγο παρηγορητικό περί Δυστυχίας και Ευτυχίας, άρχισα να ασχολούμαι πριν από αρκετά ήδη χρόνια, προκειμένου να περιληφθεί στη σειρά της "Βυζαντινής και Νεοελληνικής Βιβλιοθήκης", με επόπτη τότε τον Λίνο Πολίτη. Η επαφή μου όμως με τον Λόγο ουσιαστικά υπήρξε διαρκής, και η διερεύνηση των ποικίλων ερωτημάτων που προέκυπταν αποδείχτηκε επωφελής. Γιατί το έργο, όπως είναι γνωστό, παρουσιάζει πολλαπλό ενδιαφέρον : κειμενολογικό, γλωσσολογικό, λαογραφικό κ.ά. Μάλιστα με ορισμένα από τα θέματα αυτά, όπως εμφανίζονται στο κείμενό μας, έχω ασχοληθεί σε παλαιότερα δημοσιεύματά μου. Στην παρούσα διατριβή πρόθεσή μου είναι απλώς η αποκατάσταση και έκδοση ενός κειμένου, βασισμένη κυρίως στα δύο χειρόγραφα και στις δύο αντίστοιχες εκδόσεις που παραδίδουν το έργο. Η Εκδοση του κειμένου συνοδεύεται, όπως είναι φυσικό, από λεπτομερές Κριτικό υπόμνημα. Προτάσσονται σχετική Βιβλιογραφία και σύντομη Εισαγωγή, που επικεντρώνεται ιδίως στην ιστορία, την περιγραφή και την αποτίμηση των χειρογράφων και των εκδόσεων, ενώ σκόπιμα παραλείπονται-σε αυτό το στάδιο-γραμματικές και άλλες συναφείς παρατηρήσεις, έπονται Σχόλια, στα οποία διευκρινίζονται τα ποικίλα κειμενολογικά, γλωσσικά και άλλα ζητήματα, και έπονται Γλωσσάρι και συγκριτικοί Πίνακες των πρόσθετων στίχων κάθε χειρογράφου, καθώς επίσης των αντίστοιχων ρηματικών καταλήξεων και αυξήσεων
description: I embarked in the study of the text of "Logos Parigoritikos peri Dystyhias kai Eftihias(Speech of consolation on misfortune and good fortune) a number of years ago, under the supervision of the late Professor Linos Politis. The text was going to be invluded in the series "Byzantine and Modern Greek Library". However, my involvement with Logos has been continuous, and the study of the numerous questions raised by this text proved to be advantageous, since this work is iteresting from many points of view : textual, linguistic, ethnological etc. I have already dealt with a number of these issues in some of my previous publications. In this dissertation my aim is simply to edit and publish one text, mainly based on the two manuscripts and the two corresponding editions of the text. The Edition of the text is, of course, accompanied by a detailed apparatus criticus. The dissertation includes the publication of the text, a Bibliography and a short introduction which centers on the history, the description and evaluation of the manuscripts and their editions, while i deliberately omit, at this stage, grammatical and other comments of this sort; it also includes a commentary where various textual, linguistic and other issues are examined, and finally there is the glossary as well as comparative tables of the additional verses of each manuscript and the different verbal types
Paramagnetism of the Co sublattice in ferromagnetic Zn$_{1-x}$Co$_{x}$O films
Creators: name: Barla, A.
name: Schmerber, G.
name: Beaurepaire, E.
name: Dinia, A.
name: Bieber, H.
name: Colis, S.
name: Scheurer, F.
name: Kappler, J. -P.
name: Imperia, P.
name: Nolting, F.
name: Wilhelm, F.
name: Rogalev, A.
name: Muller, D.
name: Grob, J. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Using the spectroscopies based upon x-ray absorption, we have studied the structural and magnetic properties of Zn$_{1-x}$Co$_{x}$O films ($x$ = 0.1 and 0.25) produced by reactive magnetron sputtering. These films show ferromagnetism with a Curie temperature $T_{\mathrm{C}}$ above room temperature in bulk magnetization measurements. Our results show that the Co atoms are in a divalent state and in tetrahedral coordination, thus substituting Zn in the wurtzite-type structure of ZnO. However, x-ray magnetic circular dichroism at the Co \textit{L}$_{2,3}$ edges reveals that the Co 3\textit{d} sublattice is paramagnetic at all temperatures down to 2 K, both at the surface and in the bulk of the films. The Co 3\textit{d} magnetic moment at room temperature is considerably smaller than that inferred from bulk magnetisation measurements, suggesting that the Co 3\textit{d} electrons are not directly at the origin of the observed ferromagnetism.
description: 5 pages, 5 figures
Εξασφάλιση ποιότητας υπηρεσίας σε κανάλια πολλαπλών χρηστών
Creators: name: Αργυρίου, Νικόλαος Γ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Διαμοιρασμός του εύρους ζώνης
Ποιότητα υπηρεσίας
Ρυθμιστές ροής
Bandwidth sharing
User quality of service
Traffic regulators

description: Η βάση της συγκεκριμένης διδακτορικής διατριβής είναι η προσπάθεια να επιτευχθεί όσο το δυνατόν καλύτερη ποιότητα υπηρεσίας, (Quality of Service) σε κανάλια κοινού μέσου (π.χ. καλωδιακά δίκτυα, ασύρματα δίκτυα), όπου οι χρήστες (εφαρμογές) έχουν τη δυνατότητα να προσαρμόζουν τις απαιτήσεις εύρους ζώνης (adaptive applications) ανάλογα με το φόρτο του δικτύου. Πιο συγκεκριμένα, προτείνονται μηχανισμοί βελτιστοποίησης της ποιότητας ενός συστήματος (system perspective) ως συνάρτηση του μέσου εύρους ζώνης (long term) των χρηστών που εισήχθησαν σ\'αυτό. Παράλληλα, προτείνονται μέτρα (QoS metrics) που αποδίδουν την πραγματική ποιότητα (short term) των χρηστών (user perspective), όπως η μέγιστη επιτρεπτή μεταβολή του εύρους ζώνης και η συχνότητα των μεταβολών αυτών, κατά τη διάρκεια της παραμονής τους στο σύστημα. Η εξασφάλιση αυτών των επιπλέον μέτρων όπως αποδεικνύεται, δεν μεταβάλλει σημαντικά τη συνολική απόδοση του συστήματος
description: This thesis investigates the problem of quality of service (QoS) in multiuser multiclass channels (e.g. cable networks, wireless networks), where applications can adapt their bandwidth requirements in case of network congestion. Algorithms that optimize the system quality of service (system perspective) as a function of the mean bandwidth allocated to streams are proposed and analyzed. Moreover, metrics that capture the stream quality as perceived by the users (user perspective) are proposed and algorithms are developed that provide user guarantees with respect to these metrics, without adversely affecting the system perspective performance
Quantum Phase Transition of Many Interacting Spins Coupled to a Bosonic Bath: static and dynamical properties
Creators: name: De Filippis, G.
name: de Candia, A.
name: Mishchenko, A. S.
name: Cangemi, L. M.
name: Nocera, A.
name: Mishchenko, P. A.
name: Sassetti, M.
name: Fazio, R.
name: Nagaosa, N.
name: Cataudella, V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: By using worldline and diagrammatic quantum Monte Carlo techniques, matrix product state and a variational approach à la Feynman, we investigate the equilibrium properties and relaxation features of a quantum system of $N$ spins antiferromagnetically interacting with each other, with strength $J$, and coupled to a common bath of bosonic oscillators, with strength $α$. We show that, in the Ohmic regime, a Beretzinski-Thouless-Kosterlitz quantum phase transition occurs. While for $J=0$ the critical value of $α$ decreases asymptotically with $1/N$ by increasing $N$, for nonvanishing $J$ it turns out to be practically independent on $N$, allowing to identify a finite range of values of $α$ where spin phase coherence is preserved also for large $N$. Then, by using matrix product state simulations, and the Mori formalism and the variational approach à la Feynman jointly, we unveil the features of the relaxation, that, in particular, exhibits a non monotonic dependence on the temperature reminiscent of the Kondo effect. For the observed quantum phase transition we also establish a criterion analogous to that of the metal-insulator transition in solids.
Self-probing of Molecules with High Harmonic Generation
Creators: name: Haessler, Stefan
name: Caillat, Jérémie
name: Salières, Pascal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: This tutorial presents the most important aspects of the molecular self-probing paradigm, which views the process of high harmonic generation as "a molecule being probed by one of its own electrons". Since the properties of the electron wavepacket acting as a probe allow a combination of attosecond and Ångström resolutions in measurements, this idea bears great potential for the observation, and possibly control, of ultrafast quantum dynamics in molecules at the electronic level. Theoretical as well as experimental methods and concepts at the basis of self-probing measurements are introduced. Many of these are discussed on the example of molecular orbital tomography.
description: A PhD Tutorial
Testing Global Isotropy of Three-Year Wilkinson Microwave Anisotropy Probe (WMAP) Data: Temperature Analysis
Creators: name: Hajian, Amir
name: Souradeep, Tarun
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine statistical isotropy of large scale anisotropies of the Internal Linear Combination (ILC) map, based on three year WMAP data. Our study reveals no significant deviation from statistical isotropy on large angular scales of 3-year ILC map. Comparing statistical isotropy of 3-year ILC map and 1-year ILC map, we find a significant improvement in 3-year ILC map which can be due to the gain model, improved ILC map processing and foreground minimization.
description: 7 pages, 4 figures
Μοντέλο εκτίμησης της ποιότητας των ρεόντων υδάτων στη λεκάνη απορροής της λίμνης Ταυρωπού με βάση τα βενθικά μακροασπόνδυλα και το ελληνικό σύστημα αξιολόγησης
Creators: name: Αρτεμιάδου, Βασιλεία Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Βιολογικός δείκτης
Μακροασπόνδυλα
Τύπος ποταμού
Διαβαθμονόμηση
Μοντέλο πρόβλεψης
Biotic index
Macroinverfebrates
River type
Intercalibration
Predictive model

description: Η παρούσα διατριβή ξεκίνησε με σκοπό τη δημιουργία και βελτίωση ορισμένων εργαλείων που στηρίζονται στα βενθικά μακροασπόνδυλα, η χρήση των οποίων θα διευκόλυνε την εκτίμηση της ποιότητας των ρεόντων υδάτων στην Ελλάδα. Διακρίνεται σε τρία βασικά τμήματα α)το πρώτο περιγράφει τον επαναπροσδιορισμό του ελληνικού Συστήματος Αξιολόγησης της ποιότητας των ρεόντων υδάτων(ελληνικός δείκτης 0, το οποίο είναι προσαρμοσμένο για εφαρμογή στους ποταμούς της Βόρειας, Κεντρικής και Κεντροδυτικής Ελλάδας, β)το δεύτερο περιλαμβάνει την εποχική μελέτη των κοινωνιών των βενθικών μακροασπόνδυλων και των περιβαλλοντικών μεταβλητών στους ποταμούς της λεκάνης απορροής της τεχνητής λίμνης Ταυρωπού, καθώς και την εναρμόνιση των κατηγοριών ποιότητας του νερού του Ελληνικού Συστήματος Αξιολόγησης στη συγκεκριμένη περιοχή έρευνας με τις αντίστοιχες μιας ευρωπαϊκής βάσης δεδομένων και γ)το τρίτο αφορά στη δημιουργία μοντέλου πρόβλεψης και εκτίμησης της ποιότητας των ρεόντων υδάτων στη λεκάνη απορροής της τεχνητής λίμνης Ταυρωπού, βασιζόμενο στα δείγματα της εποχικής μελέτης και στην τελική μορφή του Ελληνικού Συστήματος Αξιολόγησης
description: The main objective of the present thesis was to creation and the improvement of two tools based on benthic macroinverfebrates, which would facilitate the assessment of the running water quality in Hellas. The thesis can be discrininated in three parts : a) the redefinition of the Hellenic Evaluation System of the running water quality, which is applicable to the rivers of North, Central and West-Central Hellas, b) the seasonal study of the streams at the basin of Tavropos reservoir as well as the harmonisation of the water quality categories of the water quality categories of the Hellenic Evaluation System with the respective ones of a European benchmark data set, regarding the specific study area, and c) a RIVPACS-type predictive model for the assessment of the running water quality in the specific study area, based on the samples of the seasonal study and using the Hellenic Evaluation System
Upper limits on the solar-neutron flux at the Yangbajing neutron monitor from BATSE-detected solar flares
Creators: name: Tsuchiya, H.
name: Miyasaka, H.
name: Takahashi, E.
name: Shimoda, S.
name: Yamada, Y.
name: Kondo, I.
name: Makishima, K.
name: Zhu, F.
name: Tan, Y.
name: Hu, H.
name: Tang, Y.
name: Zhang, J.
name: Lu, H.
name: Meng, X.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The purpose of this work is to search the Yangbajing neutron monitor data obtained between 1998 October and 2000 June for solar neutrons associated with solar flares. Using the onset times of 166 BATSE-detected flares with the GOES peak flux (1 -- 8 Å) higher than $1.0 \times 10^{-5}$ $\mathrm{Wm^{-2}}$, we prepare for each flare a light curve of the Yangbajing neutron monitor, spanning $\pm$ 1.5 hours from the BATSE onset time. Based on the light curves, a systematic search for solar neutrons in energies above 100 MeV from the 166 flares was performed. No statistically significant signals due to solar neutrons were found in the present work. Therefore, we put upper limits on the $>$ 100 MeV solar-neutron flux for 18 events consisting of 2 X and 16 M class flares. The calculation assumed a power-law shaped neutron energy spectrum and three types of neutron emission profiles at the Sun. Compared with the other positive neutron detections associated with X-class flares, typical 95% confidence level upper limits for the two X-class flares are found to be comparable to the lowest and second lowest neutron fluxes at the top of the atmosphere.In addition, the upper limits for M-class flares scatter in the range of $10^{-2}$ to 1 neutrons $\mathrm{cm^{-2}s^{-1}}$. This provides the first upper limits on the solar-neutron flux from M-class solar flares, using space observatories as well as ground-based neutron monitors.
description: accepted for publication in Astronomy and Astrophysics, section 9. The Sun
Pogonatum pergranulatum P. C. Chen
Creators: name: Zhao, Wei
name: Wang, Zhaoming
name: Zheng, Lina
name: Naren, Gaowa
name: He, Qiang
name: Han, Wei
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Plantae
Bryophyta
Bryopsida
Polytrichales
Polytrichaceae
Pogonatum
Pogonatum pergranulatum

description: Pogonatum pergranulatum P. C. Chen
Distribution
Endemic species of China (Wu and Jia 2004).
description: Published as part of Zhao, Wei, Wang, Zhaoming, Zheng, Lina, Naren, Gaowa, He, Qiang & Han, Wei, 2024, A step forward in botanical exploration with three new Polytrichaceae records from Tibet, China, pp. e 133971 in Biodiversity Data Journal 12 on page e133971, DOI: 10.3897/BDJ.12.e133971
Bimahonian distributions
Creators: name: Barcelo, Helene
name: Reiner, Victor
name: Stanton, Dennis
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05E10; 20F55; 13A50

description: Motivated by permutation statistics, we define for any complex reflection group W a family of bivariate generating functions. They are defined either in terms of Hilbert series for W-invariant polynomials when W acts diagonally on two sets of variables, or equivalently, as sums involving the fake degrees of irreducible representations for W. It is also shown that they satisfy a ``bicyclic sieving phenomenon'', which combinatorially interprets their values when the two variables are set equal to certain roots of unity.
description: Final version to appear in J. London Math. Soc
The nature of teacher expertness and its attainment
Creators: name: Rowles, Elizabeth
Publisher: name: University of British Columbia
Year: 2011

description: The purpose of the study was to explore the nature of teacher expertness and its attainment. The study was founded upon studies of expert teaching practice and studies of cognitive development. Data for the study were collected from forty secondary school teachers in one large school district in British Columbia. Data analysis involved two procedures. The first was a form of content analysis designed by the researcher to examine teachers' explicit and implicit descriptions of teaching practice. The second, done in order to gain insight about the nature of expert teachers, was an adaptation of Baltes’ method of identifying five wisdom criteria. These criteria are factual knowledge, procedural knowledge, contextualism, relativism, and uncertainty. Some themes that were found to pervade teachers' discussions were also reported and discussed separately. It was found that listening to expert teachers as they discuss their practice confirms what is known about expertness in a number of domains as well as what is known about expert teaching practice. New insights about expert teaching practice are yielded by paying attention to what is implicit in teacher-talk. It was also found that the model developed by Baltes and his associates was useful in extending knowledge of the teaching domain and might well be applied to studies of experts in other domains. Three principal conclusions were drawn. Expert teachers are prepared to assume responsibility for their own continuing development They appear not to be prepared to assume that responsibility for their less expert colleagues. It was also concluded that administrative officers in secondary schools do not increase the expertness of teachers through the supervision of instruction and that the practice of instructional supervision for this purpose requires further study.
Convolution bialgebra of a Lie groupoid and transversal distributions
Creators: name: Kalisnik, J.
name: Mrcun, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Algebra (math.QA)
subject: Differential Geometry (math.DG)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 16T05, 17B35, 22A22

description: For a Lie groupoid G over a smooth manifold M we construct the adjoint action of the etale Lie groupoid G# of germs of local bisections of G on the Lie algebroid g of G. With this action, we form the associated convolution C_c(M)/R-bialgebra C_c(G#,g). We represent this C_c(M)/R-bialgebra in the algebra of transversal distributions on G. This construction extends the Cartier-Gabriel decomposition of the Hopf algebra of distributions with finite support on a Lie group.
description: 22 pages
Bayesian foreground analysis with CMB data
Creators: name: Eriksen, H. K.
name: Dickinson, C.
name: Lawrence, C. R.
name: Baccigalupi, C.
name: Banday, A. J.
name: Gorski, K. M.
name: Hansen, F. K.
name: Pierpaoli, E.
name: Seiffert, M. D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The quality of CMB observations has improved dramatically in the last few years, and will continue to do so in the coming decade. Over a wide range of angular scales, the uncertainty due to instrumental noise is now small compared to the cosmic variance. One may claim with some justification that we have entered the era of precision CMB cosmology. However, some caution is still warranted: The errors due to residual foreground contamination in the CMB power spectrum and cosmological parameters remain largely unquantified, and the effect of these errors on important cosmological parameters such as the optical depth tau and spectral index n_s is not obvious. A major goal for current CMB analysis efforts must therefore be to develop methods that allows us to propagate such uncertainties from the raw data through to the final products. Here we review a recently proposed method that may be a first step towards that goal.
description: 8 pages; for proceedings from CMB workshop at Irvine, March 2006
Femtosecond envelope of the high-harmonic emission from ablation plasmas
Creators: name: Haessler, Stefan
name: Bom}, Luc Bertrand {Elouga
name: Gobert, Olivier
name: Hergott, Jean-François
name: Lepetit, Fabien
name: Perdrix, Michel
name: Carré, Bertrand
name: Ozaki, Tsuneyuki
name: Salières, P
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We characterize the temporal profile of the high-order harmonic emission from ablation plasma plumes using cross-correlations with the infrared (IR) laser beam provided by 2-photon harmonic+IR ionization of rare gas atoms. We study both non-resonant plasmas (lead, gold and chrome) and resonant plasmas (indium and tin), i.e. plasmas presenting in the singly-charged ions a strong radiative transition coinciding with an harmonic order. The cross-correlation traces are found very similar for all harmonic orders and all plasma targets. The recovered harmonic pulse durations are very similar to the driving laser, with a tendency towards being shorter, demonstrating that the emission is a \stef{directly} laser-driven process even in the case of resonant harmonics. This provides valuable input for theories describing resonant harmonic emission and opens the perspective of a very-high-flux tabletop \textsc{xuv} source for applications.
Magnetostatic penumbra models with field-free gaps
Creators: name: Scharmer, G. B.
name: Spruit, H. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present numerical 2D magnetostatic models for sunspot penumbrae consisting of radially aligned field-free gaps in a potential magnetic field, as proposed by Spruit and Scharmer (2006). The shape of the gaps and the field configurations around them are computed consistently from the condition of magnetostatic pressure balance between the gap and the magnetic field. The results show that field-free gaps in the {\it inner} penumbra are cusp-shaped and bounded by a magnetic field inclined by about $70^\circ$ from the vertical. Here, the magnetic component has a Wilson depression on the order 200--300 km relative to the top of the field-free gap; the gaps should thus appear as noticeably elevated features. This structure explains the large variations in field strength in the inner penumbra inferred from magnetograms and two-component inversions, and the varying appearance of the inner penumbra with viewing angle. In the {\it outer} penumbra, on the other hand, the gaps are flat-topped with a horizontal magnetic field above the middle of the gap. The magnetic field has large inclination variations horizontally, but only small fluctuations in field strength, in agreement with observations.
description: accepted for publication in A&A
Η συμβολή ατομικών και ψυχοκοινωνικών παραγόντων κατά την προσαρμογή του φοιτητικού πληθυσμού στο πανεπιστήμιο
Creators: name: Γκαντώνα, Γεωργία
Publisher: name: Aristotle University of Thessaloniki
Year: 2007
Subjects: Οικογενειακή συνοχή & προσαρμοστικότητα
Οικοσυστημική προσέγγιση
Προσωπικός έλεγχος
Αισιοδοξία
Family cohesion & adaptability
Ecosystemic approach
Optimism
Personal mastery

description: Στην παρούσα έρευνα μελετάται η έννοια της προσαρμογής του φοιτητικού πληθυσμού στα ελληνικά Πανεπιστήμια. Η προσαρμογή στο Πανεπιστήμιο γίνεται αντιληπτή μέσα από μια αλληλεπιδραστική-ολιστική αναπτυξιακή προσέγγιση και το θεωρητικό υπόβαθρο είναι η Οικοσυστημική Προσέγγιση του Bronfenbrenner. Συγκεκριμένα, μελετάται η συμβολή των ατομικών παραγόντων, όπως δημογραφικά στοιχεία και χαρακτηριστικά προσωπικότητας(αισιοδοξία, προσωπικός έλεγχος), αλλά και παραγόντων πλαισίου(οικογενειακή συνοχή ή προσαρμοστικότητα και κοινωνική στήριξη από φίλους) στην προσαρμογή των φοιτητών/τριών. Το δείγμα της έρευνας αποτέλεσαν 678 πρωτοετείς από διάφορα Πανεπιστήμια της Ελλάδας. Τα ευρήματα της έρευνας δείξανε ότι η προσαρμογή εξερτάται σε μεγαλύτερο βαθμό απ'τα λειτουργικά χαρακτηριστικά των οικοσυστημάτων στα οποία συμμετέχουν οι φοιτητές/τριες
description: The present study focuses on students' adjustment to University. The theoretical approach of the study is the Ecosystemic approach of Bronfenbrenner. Particularly, the contribution of personal and psychosocial factors, such as personal mastery, optimision and family cohesion & adaptability, friends' support, on students adjustment to University is studied. The sample of the study consisted of 678 first students from Greek Universities. The results showed that adjustment is mostly related to functional than structural characteristics of the systems students belong to
Elicitation of verb paradigms and Hupa vocabulary
Creators: name: Parker, Verdena
name: Chase, Sara
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-171215-01: elicitation of vocabulary related to emotions, followed by verb paradigm elicitation. Verdena says the date in Hupa.
Ring conformations in bidisperse blends of ring polymers
Creators: name: Lang, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The size of rings (also called cyclic polymers) in bidisperse blends of chemically identical rings is analyzed by computer simulations. Data of entangled ring blends and blends of interpenetrating rings are compared and it is shown that the compression of entangled rings can be explained by the changes in the penetrable fraction of the minimal surface bounded by the ring. Corrections for small rings can be approximated by a concatenation probability $1-P_{OO}$ that a ring entraps at least one other ring. Both results are in line with a previous work [1] to explain the compression of entangled rings in monodisperse melts. Bond-bond correlations in melts of interpenetrating rings lead to similar corrections for ring sizes as reported previously [2] for monodisperse linear melts. For entangled rings, bond-bond correlations show an anti-correlation peak at a curvilinear distance of about ten segments that coincides with a horizontal tangent in the normalized mean square internal distances along the ring. Both observations become independent of melt molecular weight for sufficiently large degrees of polymerization and such behavior is not found in samples with entanglements switched off. In consequence, the length scale of topological interactions (entanglement length) in a melt of entangled rings must be considered as constant in contrast to a recent proposal by Sakaue [3].
$A_4$ Group and Tri-bimaximal Neutrino Mixing -- A Renormalizable Model
Creators: name: He, Xiao-Gang
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The tetrahedron $A_4$ group has been widely used in studying neutrino mixing matrix. It provides a natural framework of model building for the tri-bimaximal mixing matrix. In this class of models, it is necessary to have two Higgs fields, $χ$ and $χ'$, transforming under $A_4$ as 3 with one of them having vacuum expectation values for the three components to be equal and another having only one of the components to be non-zero. These specific vev structures require separating $χ$ and $χ'$ from communicating with each other. The clash of the different vev structures for $χ$ and $χ'$ is the so called sequestering problem. In this work, I show that it is possible to construct renormalizable supersymmetric models producing the tri-bimaximal neutrino mixing with no sequestering problem.
description: 4 pages
The Cosmic Coincidence as a Temporal Selection Effect Produced by the Age Distribution of Terrestrial Planets in the Universe
Creators: name: Lineweaver, Charles H.
name: Egan, Chas A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The energy densities of matter and the vacuum are currently observed to be of the same order of magnitude: $(Ω_{m 0} \approx 0.3) \sim (Ω_{Λ0} \approx 0.7)$. The cosmological window of time during which this occurs is relatively narrow. Thus, we are presented with the cosmological coincidence problem: Why, just now, do these energy densities happen to be of the same order? Here we show that this apparent coincidence can be explained as a temporal selection effect produced by the age distribution of terrestrial planets in the Universe. We find a large ($\sim 68 %$) probability that observations made from terrestrial planets will result in finding $Ω_m$ at least as close to $Ω_Λ$ as we observe today. Hence, we, and any observers in the Universe who have evolved on terrestrial planets, should not be surprised to find $Ω_m \sim Ω_Λ$. This result is relatively robust if the time it takes an observer to evolve on a terrestrial planet is less than $\sim 10$ Gyr.
description: Submitted to ApJ
Determining Supersymmetric Parameters With Dark Matter Experiments
Creators: name: Hooper, Dan
name: Taylor, Andrew M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this article, we explore the ability of direct and indirect dark matter experiments to not only detect neutralino dark matter, but to constrain and measure the parameters of supersymmetry. In particular, we explore the relationship between the phenomenological quantities relevant to dark matter experiments, such as the neutralino annihilation and elastic scattering cross sections, and the underlying characteristics of the supersymmetric model, such as the values of mu (and the composition of the lightest neutralino), m_A and tan beta. We explore a broad range of supersymmetric models and then focus on a smaller set of benchmark models. We find that by combining astrophysical observations with collider measurements, mu can often be constrained far more tightly than it can be from LHC data alone. In models in the A-funnel region of parameter space, we find that dark matter experiments can potentially determine m_A to roughly +/-100 GeV, even when heavy neutral MSSM Higgs bosons (A, H_1) cannot be observed at the LHC. The information provided by astrophysical experiments is often highly complementary to the information most easily ascertained at colliders.
description: 46 pages, 76 figures
Transcription of file 024_B (collection LA 256)
Creators: name: Parker, Verdena
name: Chase, Sara
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: hup

description: Audio file VP-161215-08: transcription of file 024_B (tape 24, side B) from LA 256 (collection of recordings given to the Berkeley Language Center by Verdena), from 24:50 to 26:21. Audio file edited to remove incorrect date stated at start of file. Due to re-numbering, tape 024_B has been assigned to the CLA item number LA256.024, audio file LA256.024B.
A note on Larsen's conjecture and ranks of elliptic curves
Creators: name: Dokchitser, Tim
name: Dokchitser, Vladimir
Publisher: name: arXiv
Year: 2008
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G05 (Primary), 11G40, 14G25 (Secondary)

description: Let E be an elliptic curve defined over a number field K. Michael Larsen conjectured that for any finitely generated subgroup G of Gal(\bar K/K), the Mordell-Weil rank of E is unbounded in number fields fixed by G. We prove that the conjecture holds over K=Q for both the analytic rank and the p-infinity Selmer rank of E for every odd prime p. For arbitrary E/K, we show that Larsen's conjecture follows from the standard conjectures for ranks of elliptic curves, provided K has a real place or E has non-integral j-invariant.
description: 7 pages
Friedel-Crafts alkylation oxidative cyclization catalyzed by co-oxidation of SeO2 and FeCl3: a simple synthesis of benzo[b]furan from acetophenone and anisole
Creators: name: Xu, Yuyan
name: Sun, Jie
name: Ke, Zhiwei
name: Li, Ziwei
name: Tang, Wei
name: Xu, Yicheng
name: Chen, Zhiwei
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: Computational Biology

description: A simple one-pot method was developed to complete the α-diphenyl substitution and cyclization of acetophenone using acetophenone and substituted benzene as substrates, and a series of benzofuran derivatives was synthesized efficiently. It had the advantages of medium to excellent yield and easily obtained substrate. Compared with other methods, the method avoids the use of precious metals and cumbersome operations.