cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
PT-symmetric Solutions of Schrodinger Equation with position-dependent mass via Point Canonical Transformation
Creators: name: Tezcand, Cevdet
name: Sever, Ramazan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: PT-symmetric solutions of Schrodinger equation are obtained for the Scarf and generalized harmonic oscillator potentials with the position-dependent mass. A general point canonical transformation is applied by using a free parameter. Three different forms of mass distributions are used. A set of the energy eigenvalues of the bound states and corresponding wave functions for target potentials are obtained as a function of the free parameter.
description: 13 pages
Anisotropic hyperbolic inflation for a model of two scalar and two vector fields
Creators: name: Do, Tuan Q.
name: Kao, W. F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this paper, we extend a recent proposed model of two scalar and two vector fields to a hyperbolic inflation scenario, in which the field space of two scalar fields is a hyperbolic space instead of a flat space. In this model, one of the scalar fields is assumed to be a radial field, while the other is set as an angular field. Furthermore, both scalar fields will be coupled to two different vector fields, respectively. As a result, we are able to obtain a set of exact Bianchi type I solutions to this model. Stability analysis is also performed to show that this set of anisotropic solutions is indeed stable and attractive during the inflationary phase. This result indicates that the cosmic no-hair conjecture is extensively violated in this anisotropic hyperbolic inflation model.
description: 15 pages, 2 figures. Matches the published version. All calculations are not modified. Comments are welcome
On the interaction between two Kerr black holes
Creators: name: Herdeiro, Carlos A. R.
name: Rebelo, Carmen
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The double-Kerr solution is generated using both a Backlund transformation and the Belinskii-Zakharov inverse-scattering technique. We build a dictionary between the parametrisations naturally obtained in the two methods and show their equivalence. We then focus on the asymptotically flat double-Kerr system obeying the axis condition which is Z_2^ϕinvariant; for this system there is an exact formula for the force between the two black holes, in terms of their physical quantities and the coordinate distance. We then show that 1) the angular velocity of the two black holes decreases from the usual Kerr value at infinite distance to zero in the touching limit; 2) the extremal limit of the two black holes is given by |J|=cM^2, where c depends on the distance and varies from one to infinity as the distance decreases; 3) for sufficiently large angular momentum the temperature of the black holes attains a maximum at a certain finite coordinate distance. All of these results are interpreted in terms of the dragging effects of the system.
description: 19 pages, 4 figures. v2: changed statement about thermodynamical equilibrium in section 3; minor changes; added references. v3: added references to previous relevant work; removed one equation (see note added); other minor corrections; final version to be published in JHEP
THE CHARACTER OF MIRZO BABUR IN THE INTERPRETATION OF PIRIMKUL KADYROV
Creators: name: Botirova, Anakhan
Publisher: name: Zenodo
Year: 2025

description: This article is based on Babur from the novel "Starry Nights". What the writer paid attention to when creating the character of Babur, all aspects characteristic of Babur's personality are revealed with examples.
MPEC 2024-T25 : 2024 TB
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TB

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Acoustophoresis in polymer-based microfluidic devices: modeling and experimental validation
Creators: name: Lickert, Fabian
name: Ohlin, Mathias
name: Bruus, Henrik
name: Ohlsson, Pelle
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: A finite-element model is presented for numerical simulation in three dimensions of acoustophoresis of suspended microparticles in a microchannel embedded in a polymer chip and driven by an attached piezoelectric transducer at MHz frequencies. In accordance with the recently introduced principle of whole-system ultrasound resonances, an optimal resonance mode is identified that is related to an acoustic resonance of the combined transducer-chip-channel system and not to the conventional pressure half-wave resonance of the microchannel. The acoustophoretic action in the microchannel is of comparable quality and strength to conventional silicon-glass or pure glass devices. The numerical predictions are validated by acoustic focusing experiments on 5-um-diameter polystyrene particles suspended inside a microchannel, which was milled into a PMMA-chip. The system was driven anti-symmetrically by a piezoelectric transducer, driven by a 30-V peak-to-peak AC-voltage in the range from 0.5 to 2.5 MHz, leading to acoustic energy densities of 13 J/m^3 and particle focusing times of 6.6 s.
description: 12 pages, 7 pdf figures, pdf-latex
Erbringung von Primärregelleistung durch stationäre Lithium-Ionen-Batteriespeichersysteme
Creators: name: Schulz, Paul
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2021
Subjects: subject: Batteriespeicherungssystem
subject: Primärregelleistung
subject: DDC::6** Technik, Medizin, angewandte Wissenschaften::60* Technik::600 Technik, Technologie

description: Diese Arbeit widmet sich der Fragestellung, ob die Erbringung von Primärregelleistung mit stationären Lithium-Ionen-Batteriespeichersystemen ein gewinnbringendes Unterfangen darstellen kann. Es wird hierbei die perspektive des betreuenden Unternehmens "JM-ProjektInvest GmbH" eingenommen. Der erste Teil der Arbeit thematisiert die Auslegung eines beispielhaften Systems, welches 1 MW Primärregelleistung anbietet. Zu Beginn werden wesentliche Anforderungen definiert. In den nächsten Kapiteln wird ermittelt, welche Kapazität und Leistung ein System aufweisen muss, um diesen Anforderungen im praktischen Betrieb gerecht zu werden. Diese Arbeit kommt hierbei zu der Erkenntnis, dass mindestens eine Kapazität von 1000 kWh und mindestens eine Leistung von 1423 kW nötig sind, um den heutigen Anforderungen im Betrieb zu entsprechen. Im zweiten Abschnitt wird die Best-Case- und die Worst-Case-Wirtschaftlichkeit des beispielhaften Systems mittels der Kapitalwertmethode erfasst. Hierzu wird eine Reihe von Annahmen getroffen, die eine Best- bzw. Worst-Case-Wirtschaftflichkeit zur Folge haben. Zentrales Ergebnis dieser Untersuchung ist, dass die Erbringung von Primärregelleistung, selbst unter Best-Case-Annahmen zu keinem positiven Kapitalwert führt, wenn die heutigen Marktbedingungen als Ausgangspunkt dienen. Bezüglich der Fragestellung kommt diese Arbeit zu dem Ergebnis, dass die Erbringung von Primärregelleistung mit stationären Lithium-ionen-Batteriespeicherungssystemen zum heutigen Zeitpunkt kein gewinnbringendes Unterfangen ist.
A model of a 2d non-Fermi liquid with SO(5) symmetry, AF order, and a d-wave SC gap
Creators: name: Kapit, Eliot
name: LeClair, André
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Demanding a consistent quantum field theory description of spin 1/2 particles near a circular Fermi surface in 2d leads to a unique fermionic theory with relevant quartic interactions which has an emergent Lorentz symmetry and automatically has an Sp(4) = SO(5) internal symmetry. The free theory has resistivity linear in temperature. The interacting theory has a low-energy interacting fixed point and is thus a non-Landau/Fermi liquid. Anti-ferromagnetic (AF) and superconducting (SC) order parameters are bilinears in the fields and form the 5-dimensional vector representation of SO(5). An AF phase occurs at low doping which terminates in a first order transition. We incorporate momentum dependent scattering of Cooper pairs near the Fermi surface to 1-loop and derive a new kind of SC gap equation beyond mean field with a d-wave gap solution. Taking into account the renormalization group (RG) scaling properties near the low energy fixed point, we calculate the complete phase diagram as a function of doping, which shows some universal geometric features. The d-wave SC dome terminates on the over-doped side at the fixed point of the RG,which is a quantum critical point. Optimal doping is estimated to occur just below 3/2π^2. The critical temperature for SC at optimal doping is set mainly by the universal nodal Fermi velocity and lattice spacing, and is estimated to average around 140K for LSCO. The pseudogap energy scale is identified as the RG scale of the coupling.
description: published version
title: Ανάπτυξη εργαστηριακής μεθοδολογίας και διενέργεια μετρήσεων σχετικών διαπερατοτήτων νερού-πετρελαίου σε δοκίμια πετρώματος ταμιευτήρων.
Creators: name: Νικολαου Γεωργιος
Publisher: name: Technical University of Crete
Year: 2021

description:  Οι σχετικές διαπερατότητες των περιεχόμενων ρευστών, πετρώματος ταμιευτήρα, είναι χαρακτηριστικά μεγέθη που διαδραματίζουν κρίσιμο ρόλο στο σχεδιασμό και την ανάκτηση υδρογονανθράκων από ταμιευτήρες πετρελαίου. Αναπτύχθηκε εργαστηριακή μεθοδολογία μέτρησης των σχετικών διαπερατοτήτων σε νερό και πετρέλαιο με τη μέθοδο Single-Sample Dynamic (μέθοδος μόνιμης κατάστασης).
Η περιθλασιμετρία ακτινών Χ (μέθοδος κόνεως), χρησιμοποιήθηκε με σκοπό την εύρεση των περιεχόμενων ορυκτών και τη σύσταση τους κατά βάρος. Ίχνη αργιλικών ορυκτών, έχουν τη δυνατότητα να μειώσουν δραματικά τη διαπερατότητα του πετρώματος, όταν εμποτιστούν σε πολικά ρευστά και η κατανομή μεγέθους πόρων είναι μικρή. Διαπιστώθηκε ότι ο πυρήνας είχε συγκέντρωση αργιλικών ορυκτών έως και 5% και το μεγαλύτερο ποσοστό του όγκου κενών (>50%) κατανέμεται σε πόρους μικρότερους των 3 μm.
Τα περιεχόμενα αργιλικά ορυκτά δεν προκαλούσαν τη διόγκωση των πόρων, αλλά ανήκαν στη κατηγορία των ορυκτών που προκαλούν το ωσμωτικό φαινόμενο. Η επίδραση του επηρεάζεται από την πίεση των πόρων, τη θερμοκρασία, το ιοντικό σθένος των κατιόντων, των ηλεκτρολυτών που περιέχονται στο νερό και την ακτίνα των πόρων.
 Προς διερεύνηση της καταλληλότερης ως διαπερατότητα βάσης, καθώς και των μεταξύ τους διαφορών, υπολογίστηκαν η μέγιστη διαπερατότητα σε νερό, η διορθωμένη διαπερατότητα σε αέρα, η απόλυτη διαπερατότητα που προκύπτει έμμεσα από τη μέθοδο των τριχοειδών πιέσεων και η ενεργή διαπερατότητα του πετρελαίου στο μη περαιτέρω μειώσιμο βαθμό κορεσμού σε νερό. Επιλέχθηκε η τελευταία διότι ένας ταμιευτήρας είναι πάντα κορεσμένος σε τουλάχιστον δύο ρευστά. Παρατηρείται επίσης ότι κατά τη μονοφασική ροή αέρα, όσο ελαττώνεται η ακτίνα και αυξάνεται η πίεση των πόρων, η φαινόμενη διαπερατότητα μειώνεται με μεγαλύτερο ρυθμό, επειδή το φαινόμενο ολίσθησης γίνεται εντονότερο. Ο βαθμός κορεσμού σε νερό υπολογίστηκε σε κάθε ζεύγος των σχετικών διαπερατοτήτων νερού-πετρελαίου με τη μέθοδο της ζύγισης ώστε να σχεδιαστεί το διάγραμμα των σχετικών διαπερατοτήτων των δύο φάσεων. Διερευνήθηκε επίσης η προτίμηση διαβροχής του πετρώματος. Το πέτρωμα αναγνωρίστηκε ως υδατοδιαβρεχτό.
Untersuchung von Funksystemen aus Sicht industrieller Automatisierungsanwendungen
Creators: name: Wodcke, Antonio Ashok
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2022
Subjects: subject: Funksystem
subject: Automatisierung
subject: DDC::6** Technik, Medizin, angewandte Wissenschaften::60* Technik

description: Aufgrund der Vorfälle der letzten Jahre, z.B. die Corona-Pandemie, der Krieg in der Ukraine, die Inflation und die hohen Energiepreise haben sich die Bewirtschaftungskosten für die Schule erhöht. Dadurch steht weniger Geld für andere Bereiche zur Verfügung. Das Ziel dieser Arbeit ist die Entwicklung eines auf IoT-basierendes Konzepts zur energetischen Optimierung von Schulen. Dabei wird dieses Konzept auf wirtschaftliche Tragfähigkeit geprüft. Für das Konzept zur energetischen Optimierung wurden mehrere Anwendungsfälle mit den benötigten Sensoren, Aktoren und weiteren Elementen wie einer Steuerung, einem Server und einem Gateaway entwickelt. Es ergab sich anhand des Vergleichs , das LoRaWAN die geeignetste Funktechnik für das Konzept ist. Danach wurde das Konzept auf wirtschaftliche Tragfähigkeit geprüft. Dafür wurde ein Leistungsverzeichnis mit allen benötigten Komponenten und Leistungen aufgestellt und als weiteres das Bruttohonorar nach der Honorarordnung für Ingenieure und Architekten ermittelt. Danach wurden die ermittelten Gesamtkosten und zu erwartenden Einsparungen in einer Amortisationsrechnung gegenübergestellt. Aus der Berechnung ergab sich eine Amortisationsdauer von 13 Jahren. Als Weiteres ergab die Berechnung eine Einsparung von 59.000€ an Heizkosten nach 20 Jahren. Aber es konnten einige Punkte, wie das Einsparungspotential der Strom- sowie Personalkosten und zukünftige Preissteigerungen der Energiepreise usw. nicht betrachtet werden. So das mit einer schnelleren Amortisation zu rechnen ist. Weiterführende Forschung könnte auf die Einsparpotentiale durch eine energetische Optimierung einer Schule ausgerichtet sein.
Dark Matter from Entropy Perturbations in Curved Field Space
Creators: name: Firouzjahi, Hassan
name: Gorji, Mohammad Ali
name: Mukohyama, Shinji
name: Talebian, Alireza
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The accumulated energy density of the excited entropy modes in multiple field inflationary scenarios can play the role of dark matter. In the usual case of a flat field space without any turning trajectory, only light superhorizon entropy modes can be excited through the gravitational instability. In the case of a negatively curved field space, we show that subhorizon entropy modes can be excited as well through the tachyonic instability induced by the negative curvature of the field space. The latter allows for production of entropy modes with masses larger than or at the order of the Hubble expansion rate during inflation, leading to a new dark matter scenario. Due to the contribution of subhorizon modes, the corresponding spectral density has a peak at a scale smaller than its counterpart in the models based on a flat field space. This difference makes our model observationally distinguishable.
description: 26+7 pages, 8 figures, 2 appendices, matches published version
Basis-set correction based on density-functional theory: Rigorous framework for a one-dimensional model
Creators: name: Traore, Diata
name: Giner, Emmanuel
name: Toulouse, Julien
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We reexamine the recently introduced basis-set correction theory based on density-functional theory consisting in correcting the basis-set incompleteness error of wave-function methods using a density functional. We use a one-dimensional model Hamiltonian with delta-potential interactions which has the advantage of making easier to perform a more systematic analysis than for three-dimensional Coulombic systems while keeping the essence of the slow basis convergence problem of wave-function methods. We provide some mathematical details about the theory and propose a new variant of basis-set correction which has the advantage of being suited to the development of an adapted local-density approximation. We show indeed how to develop a local-density approximation for the basis-set correction functional which is automatically adapted to the basis set employed, without resorting to range-separated density-functional theory as in previous works, but using instead a finite uniform electron gas whose electron-electron interaction is projected on the basis set. The work puts the basis-set correction theory on firmer grounds and provides an interesting strategy for the improvement of this approach.
Chemical probing spectroscopy of H3+ above the barrier to linearity
Creators: name: Kreckel, Holger
name: Bing, Dennis
name: Reinhardt, Sascha
name: Petrignani, Annemieke
name: Berg, Max
name: Wolf, Andreas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We have performed chemical probing spectroscopy of H3+ ions trapped in a cryogenic 22-pole ion trap. The ions were buffer-gas cooled to 55K by collisions with helium and argon. Excitation to states above the barrier to linearity was achieved by a Ti:Sa laser operated between 11300 and 13300 cm-1. Subsequent collisions of the excited H3+ ions with argon lead to the formation of ArH+ ions that were detected by a quadrupole mass spectrometer with high sensitivity. We report the observation of 17 previously unobserved transitions to states above the barrier to linearity. Comparison to theoretical calculations suggests that the transition strengths of some of these lines are more than five orders of magnitude smaller than those of the fundamental band, which renders them - to the best of our knowledge - the weakest H3+ transitions observed to date.
description: 22 pages, 5 figures, submitted to JCP
Strafverfolgung in Baden-Württemberg 2013
Creators: name: (:Unkn) Unknown
Publisher: name: Universität Tübingen
Year: 2014
Subjects: subject: Strafverfolgung , Baden-Württemberg
subject: 360

description: Rechtskräftig Abgeurteilte und Verurteilte in Baden-Württemberg 2013 – Ergebnisse der Strafverfolgungsstatistik – Die bundeseinheitlich durchgeführte Strafverfolgungsstatistik erfasst von baden-württembergischen Gerichten rechtskräftig abgeurteilte und verurteilte Personen, die sich vor Gericht wegen Verbrechen oder Vergehen nach dem Strafgesetzbuch oder nach anderen Bundes- bzw. Landesgesetzen verantworten mussten. Ordnungswidrigkeiten werden in der Strafverfolgungsstatistik nicht berücksichtigt.
Strafverfolgung in Baden-Württemberg 2016
Creators: name: (:Unkn) Unknown
Publisher: name: Universität Tübingen
Year: 2017
Subjects: subject: Strafverfolgung , Baden-Württemberg
subject: 360

description: Rechtskräftig Abgeurteilte und Verurteilte in Baden-Württemberg 2016 – Ergebnisse der Strafverfolgungsstatistik – Die bundeseinheitlich durchgeführte Strafverfolgungsstatistik erfasst von baden-württembergischen Gerichten rechtskräftig abgeurteilte und verurteilte Personen, die sich vor Gericht wegen Verbrechen oder Vergehen nach dem Strafgesetzbuch oder nach anderen Bundes- bzw. Landesgesetzen verantworten mussten. Ordnungswidrigkeiten werden in der Strafverfolgungsstatistik nicht berücksichtigt.
Spin current and rectification in Luttinger liquids
Creators: name: Braunecker, Bernd
name: Feldman, D. E.
name: Li, Feifei
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 demonstrate that spin current can be generated by an ac voltage in a one-channel quantum wire with strong repulsive electron interactions in the presence of a non-magnetic impurity and uniform static magnetic field. In a certain range of voltages, the spin current can exhibit a power dependence on the ac voltage bias with a negative exponent. The spin current expressed in units of $\hbar/2$ per second can become much larger than the charge current in units of the electron charge per second. The spin current generation requires neither spin-polarized particle injection nor time-dependent magnetic fields.
description: 14 pages, 5 figures
Deterministic photon storage and readout in a semimagnetic quantum-dot--cavity system doped with a single Mn ion
Creators: name: Cosacchi, M.
name: Seidelmann, T.
name: Mielnik-Pyszczorski, A.
name: Neumann, M.
name: Bracht, T. K.
name: Cygorek, M.
name: Vagov, A.
name: Reiter, D. E.
name: Axt, V. M.
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: Light trapping is a crucial mechanism for synchronization in optical communication. Especially on the level of single photons, control of the exact emission time is desirable. In this paper, we theoretically propose a single-photon buffering device composed of a quantum dot doped with a single Mn atom in a cavity. We present a method to detain a single cavity photon as an excitation of the dot. The storage scheme is based on bright to dark exciton conversion performed with an off-resonant external optical field and mediated via a spin-flip with the magnetic ion. The induced Stark shift brings both exciton states to resonance and results in an excitation transfer to the optically inactive one. The stored photon can be read out on demand in the same manner by repopulating the bright state, which has a short lifetime. Our results indicate the possibility to suspend a photon for almost two orders of magnitude longer than the lifetime of the bright exciton.
description: 13 pages, 6 figures
Contact mechanics: relation between interfacial separation and load
Creators: name: Persson, B. N. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: I study the contact between a rigid solid with a randomly rough surface and an elastic block with a flat surface. I derive a relation between the (average) interfacial separation $u$ and the applied normal squeezing pressure $p$. I show that for non-adhesive inte raction and small applied pressure, p is proportional to exp (-u/u_0), in good agreement with recent experimental observation.
description: 4 pages, 3 figures
Effects of Process Parameters in Friction Stir Welding of Aluminium Matrix Composites
Creators: name: RAJESH P V
Publisher: name: Faculty of Engineering Mahasasakham University
Year: 2021
Subjects: Friction stir welding
Input process parameters
Output responses
Optimization
Weld test

description: Mahasarakham International Journal of Engineering Technology, 7, 1, 16-22
Kinematics of the Milky Way from the Gaia EDR3 red giants and sub-giants
Creators: name: Fedorov, P. N.
name: Akhmetov, V. S.
name: Velichko, A. B.
name: Dmytrenko, A. M.
name: Denischenko, S. I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the results of the kinematic investigations carried out with the use of spatial velocities of red giants and sub-giants containing in the $Gaia$~EDR3 catalogue. The twelve kinematic parameters of the Ogorodnikov--Milne model have been derived for stellar systems with radii 0.5 and 1.0 kpc, located along the direction the Galactic center -- the Sun -- the Galactic anticenter within the range of Galactocentric distances $R$ 0--8--16~kpc. By combining some of the local parameters the information related to the Galaxy as a whole has been received in the distance range 4--12~kpc, in particular the Galactic rotational curve, its slope, velocity gradients. We show that when using this approach, there is an alternative possibility to infer the behaviour of the Galactic rotational curve and its slope without using the Galactocentric distance $R_\odot$. The kinematic parameters derived within the Solar vicinity of 1~kpc radius are in good agreement with those given in literature.
An Exploratory Search for z~6 Quasars in the UKIDSS Early Data Release
Creators: name: Glikman, Eilat
name: Eigenbrod, Alexander
name: Djorgovski, S. G.
name: Meylan, Georges
name: Thompson, David
name: Mahabal, Ashish
name: Courbin, Frederic
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We conducted an exploratory search for quasars at z~ 6 - 8, using the Early Data Release from United Kingdom Infrared Deep Sky survey (UKIDSS) cross-matched to panoramic optical imagery. High redshift quasar candidates are chosen using multi-color selection in i,z,Y,J,H and K bands. After removal of apparent instrumental artifacts, our candidate list consisted of 34 objects. We further refined this list with deeper imaging in the optical for ten of our candidates. Twenty-five candidates were followed up spectroscopically in the near-infrared and in the optical. We confirmed twenty-five of our spectra as very low-mass main-sequence stars or brown dwarfs, which were indeed expected as the main contaminants of this exploratory search. The lack of quasar detection is not surprising: the estimated probability of finding a single z>6 quasar down to the limit of UKIDSS in the 27.3 square degrees of the EDR is <5%. We find that the most important limiting factor in this work is the depth of the available optical data. Experience gained in this pilot project can help refine high-redshift quasar selection criteria for subsequent UKIDSS data releases.
description: Accepted for pubication in the Astronomical Journal
Thin Film (High Temperature) Superconducting Radiofrequency Cavities for the Search of Axion Dark Matter
Creators: name: Golm, J.
name: Cuendis, S. Arguedas
name: Calatroni, S.
name: Cogollos, C.
name: Döbrich, B.
name: Gallego, J. D.
name: Barceló, J. M. García
name: Granados, X.
name: Gutierrez, J.
name: Irastorza, I. G.
name: Koettig, T.
name: Lamas, N.
name: Liberadzka-Porret, J.
name: Malbrunot, C.
name: Millar, W. L.
name: Navarro, P.
name: Carlos, C. Pereira
name: Puig, T.
name: Rosaz, G. J.
name: Siodlaczek, M.
name: Telles, G.
name: Wuensch, W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: The axion is a hypothetical particle which is a candidate for cold dark matter. Haloscope experiments directly search for these particles in strong magnetic fields with RF cavities as detectors. The Relic Axion Detector Exploratory Setup (RADES) at CERN in particular is searching for axion dark matter in a mass range above 30 $μ$eV. The figure of merit of our detector depends linearly on the quality factor of the cavity and therefore we are researching the possibility of coating our cavities with different superconducting materials to increase the quality factor. Since the experiment operates in strong magnetic fields of 11 T and more, superconductors with high critical magnetic fields are necessary. Suitable materials for this application are for example REBa$_2$Cu$_3$O$_{7-x}$, Nb$_3$Sn or NbN. We designed a microwave cavity which resonates at around 9~GHz, with a geometry optimized to facilitate superconducting coating and designed to fit in the bore of available high-field accelerator magnets at CERN. Several prototypes of this cavity were coated with different superconducting materials, employing different coating techniques. These prototypes were characterized in strong magnetic fields at 4.2 K.
description: 5 pages, 6 figures. v2: minor updates after referee comments, matches published version in IEEE
Journal-List of SMS
Creators: name: Cathy, Guevara-Vega
name: Beatriz, Bernárdez
name: Amador, Durán
name: Margarita, Cruz
name: Pablo, Landeta
name: Antonio, Ruiz-Cortés
Publisher: name: Zenodo
Year: 2020
Subjects: Empirical Software Engineering
methodological proposals
systematic mapping study
experimental process

description: Journal-List of SMS: "Methodological proposals in Empirical Software Engineering - A literature survey"
Electronic instabilities of a Hubbard model approached as a large array of coupled chains: competition between d-wave superconductivity and pseudogap phase
Creators: name: Perfetto, E.
name: Gonzalez, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the electronic instabilities in a 2D Hubbard model where one of the dimensions has a finite width, so that it can be considered as a large array of coupled chains. The finite transverse size of the system gives rise to a discrete string of Fermi points, with respective electron fields that, due to their mutual interaction, acquire anomalous scaling dimensions depending on the point of the string. Using bosonization methods, we show that the anomalous scaling dimensions vanish when the number of coupled chains goes to infinity, implying the Fermi liquid behavior of a 2D system in that limit. However, when the Fermi level is at the Van Hove singularity arising from the saddle points of the 2D dispersion, backscattering and Cooper-pair scattering lead to the breakdown of the metallic behavior at low energies. These interactions are taken into account through their renormalization group scaling, studying in turn their influence on the nonperturbative bosonization of the model. We show that, at a certain low-energy scale, the anomalous electron dimension diverges at the Fermi points closer to the saddle points of the 2D dispersion. The d-wave superconducting correlations become also large at low energies, but their growth is cut off as the suppression of fermion excitations takes place first, extending progressively along the Fermi points towards the diagonals of the 2D Brillouin zone. We stress that this effect arises from the vanishing of the charge stiffness at the Fermi points, characterizing a critical behavior that is well captured within our nonperturbative approach.
description: 13 pages, 7 figures
The politics of welfare : Canada’s road to income security, 1914--1939
Creators: name: Schofield, Josephine Muriel
Publisher: name: University of British Columbia
Year: 2010

description: The watershed in this century's politics of welfare is the transformation in income security away from charitable towards governmental support. But in the Canadian case its origins still remain obscure. Although the shift is often pinpointed as occurring during and after World War II, the decisive battles over the propriety of a more active state role were fought between 1914 and 1939. The aims of this study are to demonstrate their significance in pioneering acceptance of the principle of social collectivism, and to shed light on the range of forces shaping the complex process of social policymaking. The case-study method is used to investigate the legacy of interwar welfare politics, viz., the development of emergency and statutory aid for select groups among the very poor. This technique has the advantage of capturing the historical dimension of the policymaking process, and filling the much-needed gaps in Canadian welfare research. Moreover, it provides an opportunity to test propositions concerning social policy innovations and developments. The existing literature identifies several factors as important: the nature of the economy, the cultural context, the structure of political institutions, and four sets of participants - militant workers, interest groups, politicians and bureaucrats. The analysis focuses upon the interaction between these determinants in shaping all the major interwar policy decisions in means-tested income maintenance. The evidence reveals that a myriad of forces shaped the origins of the Canadian welfare state, but their influence varied. Socio-economic change played a mediating role by creating the social problems requiring resolution, and generating the revenues to finance innovations. The general framework of ideas and the institutional structure also exerted a mainly indirect impact, with the former defining the values and the latter guiding the behaviour of the participants. In contrast, all the active political forces played the pivotal role of interpreting the problems and deciding the timing and content of the policy decisions. Interest group power overshadowed working-class militancy as the effective societal spur, with farmers rather than businessmen qualifying as the arch opponents of the collectivist cause. Inside government, elected, not appointed, officials dominated the social policymaking process.
Towards a definition of quantum integrability
Creators: name: Clemente-Gallardo, J.
name: Marmo, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We briefly review the most relevant aspects of complete integrability for classical systems and identify those aspects which should be present in a definition of quantum integrability. We show that a naive extension of classical concepts to the quantum framework would not work because all infinite dimensional Hilbert spaces are unitarily isomorphic and, as a consequence, it would not be easy to define degrees of freedom. We argue that a geometrical formulation of quantum mechanics might provide a way out.
description: 37 pages, AmsLatex, 1 figure
Self-consistent calculations within the Extended Theory of Finite Fermi Systems
Creators: name: Avdeenkov, A.
name: Gruemmer, F.
name: Kamerdzhiev, S.
name: Krewald, S.
name: Lyutorovich, N.
name: Speth, J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The Extended Theory of Finite Fermi Systems(ETFFS) describes nuclear excitations considering phonons and pairing degrees of freedom, using experimental single particle energies and the effective Landau-Migdal interaction. Here we use the Skyrme interactions in order to extend the range of applicability of the ETFFS to experimentally not yet investigated short-lived isotopes. We find that Skyrme interactions which reproduce at the mean field level both ground state properties and nuclear excitations are able to describe the spreading widths of the giant resonances in the new approach, but produce shifts of the centroid energies. A renormalization of the Skyrme interactions is required for approaches going beyond the mean field level.
description: 7 pages, 5 figures, corrected typos
Cubical convex ear decompositions
Creators: name: Woodroofe, Russ
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05E25

description: We consider the problem of constructing a convex ear decomposition for a poset. The usual technique, first used by Nyman and Swartz, starts with a CL-labeling and uses this to shell the `ears' of the decomposition. We axiomatize the necessary conditions for this technique as a "CL-ced" or "EL-ced". We find an EL-ced of the d-divisible partition lattice, and a closely related convex ear decomposition of the coset lattice of a relatively complemented group. Along the way, we construct new EL-labelings of both lattices. The convex ear decompositions so constructed are formed by face lattices of hypercubes. We then proceed to show that if two posets P_1 and P_2 have convex ear decompositions (CL-ceds), then their products P_1 \times P_2, P_1 \lrtimes P_2, and P_1 \urtimes P_2 also have convex ear decompositions (CL-ceds). An interesting special case is: if P_1 and P_2 have polytopal order complexes, then so do their products.
description: 33 pages. v2 shows that products of spaces with ceds have ceds (which was a question in v1), improves exposition. v3 further improves exposition and corrects typos
Mean-field theory of vector spin models on networks with arbitrary degree distributions
Creators: name: Metz, Fernando L.
name: Peron, Thomas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Understanding the relationship between the heterogeneous structure of complex networks and cooperative phenomena occurring on them remains a key problem in network science. Mean-field theories of spin models on networks constitute a fundamental tool to tackle this problem and a cornerstone of statistical physics, with an impressive number of applications in condensed matter, biology, and computer science. In this work we derive the mean-field equations for the equilibrium behavior of vector spin models on high-connectivity random networks with an arbitrary degree distribution and with randomly weighted links. We demonstrate that the high-connectivity limit of spin models on networks is not universal in that it depends on the full degree distribution. Such nonuniversal behavior is akin to a remarkable mechanism that leads to the breakdown of the central limit theorem when applied to the distribution of effective local fields. Traditional mean-field theories on fully-connected models, such as the Curie-Weiss, the Kuramoto, and the Sherrington-Kirkpatrick model, are only valid if the network degree distribution is highly concentrated around its mean degree. We obtain a series of results that highlight the importance of degree fluctuations to the phase diagram of mean-field spin models by focusing on the Kuramoto model of synchronization and on the Sherrington-Kirkpatrick model of spin-glasses. Numerical simulations corroborate our theoretical findings and provide compelling evidence that the present mean-field theory describes an intermediate regime of connectivity, in which the average degree $c$ scales as a power $c \propto N^{b}$ ($b < 1$) of the total number $N \gg 1$ of spins. Our findings put forward a novel class of spin models that incorporate the effects of degree fluctuations and, at the same time, are amenable to exact analytic solutions.
description: 20 pages, 7 figures
Investigations of the magnetospheric plasma distribution in the vicinity of a pulsar - I Basic formulation
Creators: name: Donald, John Mc
name: Shearer, Andrew
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The magnetospheric plasma distribution in the vicinity of a pulsar at various inclination angles is investigated using a new relativistic, parallel 3D Particle-In-Cell (PIC) code DYMPHNA3D. DYMPHNA3D uses a superposition of the electromagnetic fields associated with a rotating magnetised conducting sphere in a vacuum (the pulsar fields) and the electromagnetic fields due to the presence of the magnetospheric plasma surrounding the pulsar (the plasma fields), as the total fields. The plasma is moved self-consistently through the magnetosphere using the PIC methodology. Our initial simulation results are presented here. These show similar solutions to those obtained from previous numerical simulations, which show the fundamental plasma distribution in the vicinity of an aligned rotating neutron star to consist of two polar domes and an equatorial torus of trapped non-neutral plasma of opposite sign. The aligned case being the case in which the inclination angle between the magnetic dipole moment and the rotation axis of the star is zero. Furthermore, our code allows for off-axis simulations and we have found that this plasma distribution collapses into a Quad-Lobe charge-separated non-neutral magnetospheric plasma distribution in the case of an orthogonal rotator, i.e., the case in which the magnetic dipole moment is oriented at right angles to the rotation axis of the neutron star, with the plasma remaining trapped close to the stellar surface by the force-free surfaces. We find that if initialised with a Goldreich-Julian type distribution, the system is seen to collapse rapidly into these stable Dome-Torus structures.
description: 19 pages, 4 figures, accepted by ApJ
Proof-Theoretic Semantics, a Problem with Negation and Prospects for Modality
Creators: name: Kürbis, Nils
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Logic (math.LO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: This paper discusses proof-theoretic semantics, the project of specifying the meanings of the logical constants in terms of rules of inference governing them. I concentrate on Michael Dummett's and Dag Prawitz' philosophical motivations and give precise characterisations of the crucial notions of harmony and stability, placed in the context of proving normalisation results in systems of natural deduction. I point out a problem for defining the meaning of negation in this framework and prospects for an account of the meanings of modal operators in terms of rules of inference.
Examining relationships of the anterior pelvic tilt angle with the anterior-posterior curvatures and elongation of the spine
Creators: name: Mieszała, Waldemar
name: Demczuk-Włodarczyk, Ewa
name: Chromik, Krystyna
name: Hawrylak, Arletta
name: Małachowska-Sobieska, Monika
Publisher: name: Institute of Machine Design and Operation, Wrocław University of Technology, Wrocław
Year: 2019
Subjects: children, lumbar lordosis, thotacic kyphosis, elongation, body shape, Posturometr-S

description: Acta of Bioengineering and Biomechanics; 01/2019; ISSN 1509-409X
An exoskeleton arm optimal configuration determination using inverse kinematics and genetic algorithm
Creators: name: Głowiński, Sebastian
name: Blażejewski, Andrzej
Publisher: name: Institute of Machine Design and Operation, Wrocław University of Technology, Wrocław
Year: 2019
Subjects: arm exoskeleton, genetic algorithm, inverse kinematics

description: Acta of Bioengineering and Biomechanics; 01/2019; ISSN 1509-409X
Joachimite apocalypticism, Cistercian mysticism and the sense of disintegration in Perlesvaus and The queste del saint Graal
Creators: name: O’Hagan, Michael
Publisher: name: University of British Columbia
Year: 2010

description: The two early thirteenth-century romances Perlesvaus and the Queste del saint Graal are strongly influenced by particular theological doctrines. The primary influence on Perlesvaus is apocalyptic: not only does it reflect characteristically apocalyptic concepts of justice, moral obligation and redemption, but it also depends on the all-encompassing struggle between good and evil to unify its plot. More specifically, Perlesvaus shows special affinity for the particular apocalyptic views of Joachim of Fiore, whose theory of the three ages of history and whose exege-tical principle of concordia litterae-are important influences on it. The theology of the Queste, on the other hand, is mystical, emphasizing the inner life of the soul; yet the mystical Queste is more concerned with knighthood than is Perlesvaus. The ultimate fruit of spiritual enlightenment, moral struggle and growth in grace - all important themes in themselves - is a renewed knighthood drawing its inner strength from holiness and capable of giving the godly knight the kind of meaningful chivalrous adventure that his more worldly fellows cannot achieve. Underlying these distinct theologies is a common preoccupation with change and dissolution expressed principally through the material imagery of water, representing transition and the threat of destruction, and of fire, evoking the unchangeable absoluteness of the beyond. Further similarities in the less prominent material images of earth and sky and in the choice of colour images confirm that the parallel use of imagery of destructive water and of a fire that is more light than flame is not simple coincidence. Two very different theological responses have been elicited by a shared longing for the pure and absolute in the midst of profoundly menacing change.
How to pose material design problems for flow through porous media applications?: Sensitivity of dissipation rate to medium's permeability holds the key
Creators: name: Nakshatrala, K. B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Recent studies have advocated using the total dissipation rate under topology optimization to realize material designs involving the flow of fluids through porous media. However, these studies decided how to pose the design problem, such as maximizing the total dissipation rate for some situations while minimizing for others, by solving one-dimensional problems and justifying their choices using numerical experiments. The rigor is lacking -- a bottleneck for further scientific advancements to computational material design. This paper provides the missing theoretical justification. We identify four classes of boundary value problems using the adjoint state method and analytically calculate the sensitivity of the total dissipation rate to the permeability field. For two of those classes in which the flow of fluids is pressure-driven, the sensitivity is positive -- the total dissipation rate increases if the medium's permeability increases. While for the other two classes, in which the flow is velocity-driven, the trend is the opposite. These sensitivities provide rigorous answers to the central question: how to pose a material design problem for flow through porous media applications. The impact of our work is multi-fold. First, this study further elevates the role of the dissipation rate in posing well-posed material design problems using topology optimization. Second, besides the theoretical significance, the results benefit computational scientists and practitioners to realize optimal designs. Third, given their simplicity yet far-reaching impact, both the approach and results possess immense pedagogical value.
Detecting entanglement of random states with an entanglement witness
Creators: name: Znidaric, Marko
name: Prosen, Tomaz
name: Benenti, Giuliano
name: Casati, Giulio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The entanglement content of high-dimensional random pure states is almost maximal, nevertheless, we show that, due to the complexity of such states, the detection of their entanglement using witness operators is rather difficult. We discuss the case of unknown random states, and the case of known random states for which we can optimize the entanglement witness. Moreover, we show that coarse graining, modeled by considering mixtures of m random states instead of pure ones, leads to a decay in the entanglement detection probability exponential with m. Our results also allow to explain the emergence of classicality in coarse grained quantum chaotic dynamics.
description: 14 pages, 4 figures; minor typos corrected