cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Asymptotics of Landau constants with optimal error bounds
Creators: name: Li, Yutian
name: Liu, Saiyu
name: Xu, Shuaixia
name: Zhao, Yuqiu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 39A60, 41A60, 41A17, 33C05

description: We study the asymptotic expansion for the Landau constants $G_n$ $$πG_n\sim \ln N + γ+4\ln 2 + \sum_{s=1}^\infty \frac {β_{2s}}{N^{2s}},~~n\rightarrow \infty, $$ where $N=n+3/4$, $γ=0.5772\cdots$ is Euler's constant, and $(-1)^{s+1}β_{2s}$ are positive rational numbers, given explicitly in an iterative manner. We show that the error due to truncation is bounded in absolute value by, and of the same sign as, the first neglected term for all nonnegative $n$. Consequently, we obtain optimal sharp bounds up to arbitrary orders of the form $$ \ln N+γ+4\ln 2+\sum_{s=1}^{2m}\frac{β_{2s}}{N^{2s}}< πG_n < \ln N+γ+4\ln 2+\sum_{s=1}^{2k-1}\frac{β_{2s}}{N^{2s}}$$ for all $n=0,1,2,\cdots$, $m=1,2,\cdots$, and $k=1,2,\cdots$. The results are proved by approximating the coefficients $β_{2s}$ with the Gauss hypergeometric functions involved, and by using the second order difference equation satisfied by $G_n$, as well as an integral representation of the constants $ρ_k=(-1)^{k+1}β_{2k}/(2k-1)!$.
description: 22 pages, 2 figures. Errors are corrected, and a hypergeometric function (see (3.14)) has used, involving a quadratic transformation
Effects of inner electrons on atomic strong-field ionization dynamics
Creators: name: Rapp, J.
name: Bauer, D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The influence of inner electrons on the ionization dynamics in strong laser fields is investigated in a wavelength regime where the inner electron dynamics is usually assumed to be negligible. The role of inner electrons is of particular interest for the application of frozen-core approximations and pseudopotentials in time-dependent density functional theory (TDDFT) and the single-active-electron (SAE) approximation in strong-field laser physics. Results of TDDFT and SAE calculations are compared with exact ones obtained by the numerical ab initio solution of the three-electron time-dependent Schrödinger equation for a lithium model atom. It is found that dynamical anti-screening, i.e., a particular form of dynamical core polarization, may substantially alter the ionization rate in the single-photon regime. Requirements for the validity of the approximations in the single and multiphoton ionization domain are identified.
description: 14 pages, 10 figures, REVTeX 4.1
title: Die Reithalle bei Schloss Taxis in Dischingen-Trugenhofen. Eine Restaurierungsgeschichte
Creators: name: Blumer, Rolf-Dieter
name: Clostermann, Gertrud
name: Klos, Hermann
name: Menrad, Andreas
name: Numberger, Markus
Publisher: name: University Library Heidelberg
Year: 2013

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 39, Nr. 3 (2010), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
title: Ein klassizistisches Kleinod vom Abriss bedroht: Das Gasthaus Rössle in Trillfingen
Creators: name: Friesch, Holger
Publisher: name: University Library Heidelberg
Year: 2013

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 39, Nr. 3 (2010), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
On conjugate times of LQ optimal control problems
Creators: name: Agrachev, Andrei
name: Rizzi, Luca
name: Silveira, Pavel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Differential Geometry (math.DG)
subject: Dynamical Systems (math.DS)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 49N10, 53D12

description: Motivated by the study of linear quadratic optimal control problems, we consider a dynamical system with a constant, quadratic Hamiltonian, and we characterize the number of conjugate times in terms of the spectrum of the Hamiltonian vector field $\vec{H}$. We prove the following dichotomy: the number of conjugate times is identically zero or grows to infinity. The latter case occurs if and only if $\vec{H}$ has at least one Jordan block of odd dimension corresponding to a purely imaginary eigenvalue. As a byproduct, we obtain bounds from below on the number of conjugate times contained in an interval in terms of the spectrum of $\vec{H}$.
description: 14 pages, 1 figure. Final version, to appear on JDCS
title: Bibliotheksdarstellungen im Film: Ein Analysemodell und vier Fallbeispiele
Creators: name: Hermann, Martin
Publisher: name: University Library Heidelberg
Year: 2012

description: Die Darstellung von Bibliotheken und Bibliothekaren ist von den Anfängen des Kinos bis zur Gegenwart ein fester Bestandteil der Filmgeschichte. Dennoch ist der Darstellung der Institution Bibliothek in der akademischen Diskussion bisher wenig Beachtung geschenkt worden. Die wenigen Beiträge sind sich in ihrer Betrachtung von Bibliotheken im Film erstaunlicherweise darin einig, dass Bibliotheken vorrangig die Funktion einer atmosphärischen Kulisse einnehmen und darüber hinaus nur selten eine weitergehende, für die Handlung erhebliche Bedeutung erfahren. Diese undifferenzierte Sicht auf Bibliotheken im Film wird der Fülle und Vielfalt der Darstellungen jedoch nicht gerecht. Um die Vielschichtigkeit der Thematik besser zu erfassen, wird in diesem Artikel ein Analysemodell vorgeschlagen, das eine strukturierte Einordnung von Bibliotheksdarstellungen im Film erlaubt. Anhand vier filmischer Beispiele – Indiana Jones and the Last Crusade (1989), Misery (1990), City of Angels (1998) und The Shawshank Redemption (1994) – werden unterschiedliche Ausprägungsformen von Bibliothekdarstellungen im Film aufgezeigt. Diese Fallbeispiele verdeutlichen, dass die Funktionen und Bedeutungen von Bibliotheken im Film wesentlich vielfältiger sind als bisher allgemein angenommen. Es lässt sich in zudem in Ansätzen herausarbeiten, mit welchen Attributen und Werten Bibliotheken konventionell in Verbindung gebracht werden.
description: Perspektive Bibliothek, Bd. 1, Nr. 1 (2012), Beginn und Erscheinungsfrequenz: Nummer: 1, Jahr: 2012, Bände pro Jahr: 1
Boosting work characteristics and overall heat engine performance via shortcuts to adiabaticity: quantum and classical systems
Creators: name: Deng, Jiawen
name: Wang, Qing-hai
name: Liu, Zhihao
name: Hanggi, Peter
name: Gong, Jiangbin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Under a general framework, shortcuts to adiabatic processes are shown to be possible in classical systems. We then study the distribution function of the work done on a small system initially prepared at thermal equilibrium. It is found that the work fluctuations can be significantly reduced via shortcuts to adiabatic processes. For example, in the classical case probabilities of having very large or almost zero work values are suppressed. In the quantum case negative work may be totally removed from the otherwise non-positive-definite work values. We also apply our findings to a micro Otto-cycle-based heat engine. It is shown that the use of shortcuts, which directly enhances the engine output power, can also increase the heat engine efficiency substantially, in both quantum and classical regimes.
description: 8 pages, 4 figures, finalized version published in the December 2013 issue of Phys. Rev. E
title: Editorial zur zweiten Ausgabe
Creators: name: Apel, Jochen
name: Hermann, Martin
Publisher: name: University Library Heidelberg
Year: 2012

description: Perspektive Bibliothek, Bd. 1, Nr. 2 (2012), Beginn und Erscheinungsfrequenz: Nummer: 1, Jahr: 2012, Bände pro Jahr: 1
title: Open Access und Lizenzierung am Beispiel der Allianz-Lizenzen
Creators: name: Blümm, Mirjam
Publisher: name: University Library Heidelberg
Year: 2012

description: Im Kontext nationaler Lizenzen erscheinen die Begriffe Open Access auf der einen und Lizenzierung auf der anderen Seite zwei Gegenpole darzustellen – die freie versus kostenpflichtige Nutzung elektronischer Ressourcen. Der Aufsatz zeigt, warum dennoch beide Komponenten Bestandteil der neu entwickelten Allianz-Lizenzen sind. Dabei stellt er die verschiedenen Lizenzierungsmodelle der Deutschen Forschungsgemeinschaft in ihrer historischen Entwicklung von den Nationallizenzen Classics bis hin zu den seit Anfang des letzten Jahres bestehenden Allianz-Lizenzen vor. Letztere werden hinsichtlich ihrer Konzeption, des dahinterstehenden Lizenzierungsmodells und ihrer zukünftige Ausrichtung näher beleuchtet. Nachdem die Thematik in den Kontext der Open Access-Diskussion eingeordnet wurde, beschäftigt sich der Aufsatz im Weiteren mit der Position der Deutschen Forschungsgemeinschaft bezüglich der Handlungsfelder Open Access und Lizenzierung. Dem folgt eine Analyse, wie die Open Access-Komponente bei den einzelnen Produkten der Allianz-Lizenzen umgesetzt wurde und wie sich die Bedingungen von den in der SHERPA/RoMEO- Datenbank verzeichneten Rechten unterscheidet. Dies mündet in Überlegungen, wie die durch die Allianz-Lizenzen garantierten Open Access-Rechte bei den beteiligten Einrichtungen und Autoren umgesetzt werden können und ob sich dadurch künftig Veränderungen auf dem Publikationsmarkt ergeben.
description: Perspektive Bibliothek, Bd. 1, Nr. 2 (2012), Beginn und Erscheinungsfrequenz: Nummer: 1, Jahr: 2012, Bände pro Jahr: 1
Quantum versus classical instability of scalar fields in curved backgrounds
Creators: name: Mendes, Raissa F. P.
name: Matsas, George E. A.
name: Vanzella, Daniel A. T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: General-relativistic stable spacetimes can be made unstable under the presence of certain nonminimally coupled free scalar fields. In this paper, we analyze the evolution of linear scalar-field perturbations in spherically symmetric spacetimes and compare the classical stability analysis with a recently discussed quantum field one. In particular, it is shown that vacuum fluctuations lead to natural seeds for the unstable phase, whereas in the classical framework the presence of such seeds in the initial conditions must be assumed.
description: 5 pages, 1 figure; condensed and revised version matching published one
title: Ein neues Aufgabenfeld für Bibliotheken? Virtuelle Forschungsumgebungen in den Naturwissenschaften am Beispiel des Fachs Physik
Creators: name: Apel, Jochen
Publisher: name: University Library Heidelberg
Year: 2012

description: Dieser Artikel untersucht am Beispiel des Fachs Physik die folgenden beiden Fragen: Was müssen Virtuelle Forschungsumgebungen leisten, um moderne naturwissenschaftliche Forschung adäquat zu unterstützen, und auf welche Weise können Bibliotheken zur Realisierung dieser Leistungen beitragen? Im Hinblick auf diese Fragestellungen werden die Bereiche Projektmanagement, Informationsretrival und -management, Forschungsprimärdatenmanagement, elektronisches Publizieren und Langzeitarchivierung sowie organisatorische Querschnittsaufgaben in den Blick genommen. Es wird ein Katalog von möglichen Diensten und Anwendungen Virtueller Forschungsumgebungen in der Physik entwickelt und diskutiert welche Dienstleistungen Bibliotheken in diesem Zusammenhang anbieten könnten. Anhand dreier Fallbeispiele (HEP-CG, GAVO, AWOB) werden diese Überlegungen zudem mit der Praxis abgeglichen.
description: Perspektive Bibliothek, Bd. 1, Nr. 2 (2012), Beginn und Erscheinungsfrequenz: Nummer: 1, Jahr: 2012, Bände pro Jahr: 1
Quantifying Coherence
Creators: name: Baumgratz, T.
name: Cramer, M.
name: Plenio, M. B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a rigorous framework for the quantification of coherence and identify intuitive and easily computable measures of coherence. We achieve this by adopting the viewpoint of coherence as a physical resource. By determining defining conditions for measures of coherence we identify classes of functionals that satisfy these conditions and other, at first glance natural quantities, that do not qualify as coherence measure. We conclude with an outline of the questions that remain to be answered to complete the theory of coherence as a resource.
description: 11 pages, close to published version
The Afterglow of GRB 130427A from 1 to 10^16 GHz
Creators: name: Perley, D. A.
name: Cenko, S. B.
name: Corsi, A.
name: Tanvir, N. R.
name: Levan, A. J.
name: Kann, D. A.
name: Sonbas, E.
name: Wiersema, K.
name: Zheng, W.
name: Zhao, X. -H.
name: Bai, J. -M.
name: Bremer, M.
name: Castro-Tirado, A. J.
name: Chang, L.
name: Clubb, K. I.
name: Frail, D.
name: Fruchter, A.
name: Göğüş, E.
name: Greiner, J.
name: Güver, T.
name: Horesh, A.
name: Filippenko, A. V.
name: Klose, S.
name: Mao, J.
name: Morgan, A. N.
name: Pozanenko, A. S.
name: Schmidl, S.
name: Stecklum, B.
name: Tanga, M.
name: Volnova, A. A.
name: Volvach, A. E.
name: Wang, J. -G.
name: Winters, J. -M.
name: Xin, Y. -X.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present multiwavelength observations of the afterglow of GRB 130427A, the brightest (in total fluence) gamma-ray burst of the past 29 years. Optical spectroscopy from Gemini-North reveals the redshift of the GRB to be z=0.340, indicating that its unprecedented brightness is primarily the result of its relatively close proximity to Earth; the intrinsic luminosities of both the GRB and its afterglow are not extreme in comparison to other bright GRBs. We present a large suite of multiwavelength observations spanning from 300 s to 130 d after the burst and demonstrate that the afterglow shows relatively simple, smooth evolution at all frequencies with no significant late-time flaring or rebrightening activity. The entire dataset from 1 GHz to 10 GeV can be modeled as synchrotron emission from a combination of reverse and forward shocks in good agreement with the standard afterglow model, providing strong support to the applicability of the underlying theory and clarifying the nature of the GeV emission observed to last for minutes to hours following other very bright GRBs. A tenuous, wind-stratified circumburst density profile is required by the observations, suggesting a massive-star progenitor with a low mass-loss rate, perhaps due to low metallicity. GRBs similar in nature to GRB 130427A, inhabiting low-density media and exhibiting strong reverse shocks, are probably not uncommon but may have been difficult to recognize in the past due to their relatively faint late-time radio emission; more such events should be found in abundance by the new generation of sensitive radio and millimeter instruments.
description: Accepted to ApJ. Light curves and SEDs are available at http://www.astro.caltech.edu/~dperley/grb/130427a/data/
Opposite charged two-body system of identical counter-rotating black holes
Creators: name: Cabrera-Munguia, I.
name: Lämmerzahl, Claus
name: López, L. A.
name: Macías, Alfredo
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A 4-parametric exact solution describing a two-body system of identical Kerr-Newman counter-rotating black holes endowed with opposite electric/magnetic charges is presented. The axis conditions are solved in order to really describe two black holes separated by a massless strut. Moreover, the explicit form of the horizon half length parameter sigma in terms of physical Komar parameters, i.e., the Komar mass M, electric charge QE, angular momentum J, and a coordinate distance R is derived. Additionally, magnetic charges QB arise from the rotation of electrically charged black holes. As a consequence, in order to account for the contribution to the mass of the magnetic charge, the usual Smarr mass formula should be generalized, as it is proposed by A. Tomimatsu, Prog. Theor. Phys. 72, 73 (1984).
description: 9 pages, 4 figures
Convergence Constrained Multiuser Transmitter-Receiver Optimization in Single Carrier FDMA
Creators: name: Tervo, Valtteri
name: Tölli, Antti
name: Karjalainen, Juha
name: Matsumoto, Tad
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Convergence constrained power allocation (CCPA) in single carrier multiuser (MU) single-input multiple-output (SIMO) systems with turbo equalization is considered in this paper. In order to exploit full benefit of the iterative receiver, its convergence properties need to be considered also at the transmitter side. The proposed scheme can guarantee that the desired quality of service (QoS) is achieved after sufficient amount of iterations. We propose two different successive convex approximations for solving the non-convex power minimization problem subject to user specific QoS constraints. The results of extrinsic information transfer (EXIT) chart analysis demonstrate that the proposed CCPA scheme can achieve the design objective. Numerical results show that the proposed schemes can achieve superior performance in terms of power consumption as compared to linear receivers with and without precoding as well as to the iterative receiver without precoding.
description: Under review in IEEE Transactions on Signal Processing
title: Parameter für die Budgetierung von Patron-Driven Acquisition (PDA)
Creators: name: Hermann, Martin
Publisher: name: University Library Heidelberg
Year: 2012

description: Patron-Driven Acquisition (PDA), die kundengesteuerte E-Book-Erwerbung, erfreut sich in den letzten Jahren an Bibliotheken im In- und Ausland immer größerer Beliebtheit. Trotz der offensichtlichen Vorteile der kundenorientierten E-Book-Erwerbung zögern heute immer noch viele wissenschaftliche Bibliotheken in Deutschland, PDA in ihre Erwerbungsstrategie aufzunehmen. Die größte Sorge stellt dabei die vorzeitige Erschöpfung bzw. die Überziehung des zur Verfügung stehenden Budgets dar. Der Artikel geht von der Grundannahme aus, dass eine vorausschauende, angemessene Budgetierung möglich ist und sie einer der wichtigsten Gesichtspunkte bei der Einführung von PDA ist. Zunächst wird die Funktionsweise von PDA zusammenfassend vorgestellt und ein knapper Überblick über die üblicherweise gehandelten Vorteile und Ängste gegeben. Danach beschäftigt sich der Beitrag ausführlich mit den Parametern, deren Berücksichtigung für einen sinnvollen Einsatz und die richtige Budgetierung von PDA wesentlich sind. Hierbei wird insbesondere auf Erfahrungswerte und Studien aus dem Ausland verwiesen. Auf dieser Grundlage setzt sich der Artikel zum Schluss kurz mit budgetrelevanten Sachverhalten der PDA-Projekte an den Bibliotheken in Bielefeld, Dresden und Mannheim auseinander.
description: Perspektive Bibliothek, Bd. 1, Nr. 2 (2012), Beginn und Erscheinungsfrequenz: Nummer: 1, Jahr: 2012, Bände pro Jahr: 1
title: Die Empfehlungen des Wissenschaftsrates „zur Weiterentwicklung der wissenschaftlichen Informationsinfrastrukturen in Deutschland bis 2020“: Inhalt und kritische Bewertung im Hinblick auf das wissenschaftliche Bibliothekswesen
Creators: name: Thiessen, Peter
Publisher: name: University Library Heidelberg
Year: 2013

description: Von verschiedenen wissenschaftspolitischen Expertengremien sind in den letzten Jahren Analysen und Entwicklungsvorschläge zur Situation der wissenschaftlichen Informationsinfrastrukturen in Deutschland vorgelegt worden. Der Wissenschaftsrat thematisierte 2012 mit seinen jüngsten „Empfehlungen zur Weiterentwicklung der wissenschaftlichen Informationsinfrastrukturen in Deutschland bis 2020“ vor allem Fragen der strukturellen Organisation und Koordination von Einrichtungen aus dem Bereich der Informationsinfrastrukturen. Inwieweit die Empfehlungen des Wissenschaftsrats dabei auf Belange des wissenschaftlichen Bibliothekswesens eingehen, soll im vorliegenden Beitrag betrachtet werden. Dazu werden die Empfehlungen des Wissenschaftsrats zunächst in den bibliothekspolitischen Kontext eingeordnet (Abschnitt 1.1 und 1.3) und in ihren relevanten Aspekten vorgestellt (Abschnitt 1.2). In einer kritischen Analyse werden daraufhin wesentliche Punkte des Papiers diskutiert (Abschnitt 2), die im Hinblick auf ihre Auswirkungen auf das wissenschaftliche Bibliothekswesen in Deutschland bewertet (Abschnitt 3) werden. Als tendenziell problematisch erweisen sich dabei u. a. die Aussagen des Wissenschaftsrat zum Thema Open Access sowie zu den Finanzierungsmodalitäten künftiger Informationsinfrastrukturen und ihrer vorgeschlagenen zentralen Steuerung.
description: Perspektive Bibliothek, Bd. 2, Nr. 1 (2013), Beginn und Erscheinungsfrequenz: Nummer: 1, Jahr: 2012, Bände pro Jahr: 1
Macroscopic theory of dark sector
Creators: name: Meierovich, Boris E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: A simple Lagrangian with squared covariant divergence of a vector field as a kinetic term turned out an adequate tool for macroscopic description of the dark sector. The zero-mass field acts as the dark energy. Its energy-momentum tensor is a simple additive to the cosmological constant. Massive fields ϕ_{I} with ϕ^{K}ϕ_{K}<0 and ϕ^{K}ϕ_{K}>0 describe two different forms of dark matter. The space-like (ϕ^{K}ϕ_{K}<0) massive vector field is attractive. It is responsible for the observed plateau in galaxy rotation curves. The time-like (ϕ^{K}ϕ_{K}>0) massive field displays repulsive elasticity. In balance with dark energy and ordinary matter it provides a four parametric diversity of regular solutions of the Einstein equations describing different possible cosmological and oscillating non-singular scenarios of evolution of the universe. In particular, the singular big bang turns into a regular inflation-like transition from contraction to expansion with the accelerate expansion at late times. The fine-tuned Friedman-Robertson-Walker singular solution is a particular limiting case at the boundary of existence of regular oscillating solutions in the absence of vector fields. The simplicity of the general covariant expression for the energy-momentum tensor allows to display the main properties of the dark sector analytically and avoid unnecessary model assumptions.
description: 54 pages, 12 figures. Review article. See details in my original papers arXiv:1201.2562, arXiv:1303.7062
title: Von der Zeitung zur Nachricht: Überlegungen zu zukünftigen Aufgaben von Zeitungssammlungen und -abteilungen in Bibliotheken vor dem Hintergrund der Entwicklung des Mediums
Creators: name: Steinsieck, Andreas
Publisher: name: University Library Heidelberg
Year: 2013

description: Zeitungssammlungen und -abteilungen wissenschaftlicher Bibliotheken definieren ihren Sammlungsgegenstand traditionell materialgebunden: sie sammeln gedruckte, mindestens wöchentlich erscheinende Periodika. Retrodigitalisierung und die Veränderung des Mediums selbst verlangen nun entweder eine Ausweitung des Sammelauftrags auf digitales Material oder stellen die Existenz dieser Abteilungen in Frage. In diesem Aufsatz wird gezeigt, dass auch die Geschichte des Mediums nahelegt, den Fokus nicht auf das Material zu richten, sondern auf den Inhalt. Denn bereits beim Übergang von geschriebenen zu gedruckten Zeitung im frühen 17. Jahrhundert war das bestimmende Element die Nachrichtenakquise und Redaktionstätigkeit. Es sind die Akteure hinter den Zeitungen, die Novellanten, Korrespondenten, Redakteure oder Herausgeber, die das Medium absetzen von Belletristik oder wissenschaftlicher Literatur. Verlagerte man den Fokus auf das Nachrichtensammeln, kämen auch andere, für die Forschung zentrale Materialien in den Blick, wie etwa Archivalien aus Zeitungsredaktionen oder Material von Nachrichtenagenturen. Diese Quellengattungen werden in Deutschland bislang leider kaum gesammelt. Für Geschichtswissenschaft und Historische Publizistik wäre es ein großer Gewinn, wenn Bibliotheken hier tätig werden würden. Hier wird vorgeschlagen, Zeitungssammlungen auf andere Materialisierungsformen auszudehnen, den Sammlungsauftrag also von der Manifestationsebene auf zumindest die der Expression, wenn nicht gar auf die Werkebene zu verlagern, und sie so zu Abteilungen für Kommunikationsforschung, Kommunikationsgeschichte oder Nachrichtenforschung zu machen.
description: Perspektive Bibliothek, Bd. 2, Nr. 1 (2013), Beginn und Erscheinungsfrequenz: Nummer: 1, Jahr: 2012, Bände pro Jahr: 1
Polyadic systems, representations and quantum groups
Creators: name: Duplij, Steven
Publisher: name: arXiv
Year: 2013
Subjects: subject: Representation Theory (math.RT)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Group Theory (math.GR)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 16T05, 16T25, 17A42, 20N15, 20F29, 20G05, 20G42, 57T05

description: Polyadic systems and their representations are reviewed and a classification of general polyadic systems is presented. A new multiplace generalization of associativity preserving homomorphisms, a 'heteromorphism' which connects polyadic systems having unequal arities, is introduced via an explicit formula, together with related definitions for multiplace representations and multiactions. Concrete examples of matrix representations for some ternary groups are then reviewed. Ternary algebras and Hopf algebras are defined, and their properties are studied. At the end some ternary generalizations of quantum groups and the Yang-Baxter equation are presented.
description: 51 pages, 1 table, 1 figure, amsart. In this version: small changes. For concise (without commutative diagrams, quiver diagrams, table and figure) journal version, see http://www-nuclear.univer.kharkov.ua/lib/1017_3%2855%29_12_p28-59.pdf
title: Geoarchäologie - ein archäologisches Desiderat oder "There could be no real archaeology without Geology"
Creators: name: Gerlach, Renate
Publisher: name: University Library Heidelberg
Year: 2014

description: Geoarchäologie ist die Beantwortung archäologischer Fragen mit geowissenschaftlichen Methoden und Kenntnissen. Seit den gemeinsamen Wurzeln im 19. Jahrhundert haben sich Geologie und Ur- und Frühgeschichte zunehmend getrennt. An den heutigen, nur informellen Strukturen einer Zusammenarbeit, haben auch die intensiveren Kontakte zwischen Geowissenschaftlern und Archäologen nichts geändert, die vor rund 25 Jahren mit der Entdeckung der archäologischen Landschaft begannen. Demgegenüber steht ein gegenwärtiger B o o m des Begriffes "Geoarchäologie", der aber nur in den geowissenschaftlichen Fächern stattfindet und kaum Eingang in die archäologische Forschung findet. Dabei sind bodenkundliche, geomorphologische und landschaftsgeschichtliche Kenntnisse essentiell für die Kernaufgabe der Archäologie, das Erkennen und Bewerten von Befunden. Es handelt sich, wie die Keramikbestimmung, um ein Basis-Handwerk. Daher muß sich die Archäologie auf ihre Wurzeln besinnen und ihre eigenen „Geoarchäologen" ausbilden: "There could be no real archaeology without geology"
description: Geoarchaeology provides the answer to archaeological questions using geological and pedological methods and knowledge. Starting from c o m m o n roots in the 19 th Century, geology and archaeology have become increasingly separate. With the discovery of the archaeological landscape some 25 years ago more intensive contacts developed between geoscientists and archaeologists, but this has
not changed the informal character of their Cooperation. In contrast, the present boom in the use of the term "Geoarchaeology" current in the geosciences has had little influence on archaeological research. However, knowledge of landscapegenesis, pedology and geomorphology is essential to the main task of archaeology, namely the recognition and evaluation of archaeological features. This knowledge should be as basic to archaeology as the dating of pottery. Therefore archaeology must look back to its roots and begin to train its own "Geoarchaeologists" as "there could be no real archaeology without geology".
Nonlinear energy transfers and phase diagrams for geostrophically balanced rotating--stratified flows
Creators: name: Herbert, Corentin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences
subject: 82B05, 82D15, 86A10, 76F99

description: Equilibrium statistical mechanics tools have been developed to obtain indications about the natural tendencies of nonlinear energy transfers in two-dimensional and quasi two-dimensional flows like rotating and stratified flows in geostrophic balance. In this article, we consider a simple model of such flows with a non-trivial vertical structure, namely two-layer quasi-geostrophic flows, which remain amenable to analytical study. We obtain the statistical equilibria of the system in the case of a linear vorticity-stream function relation, build the corresponding phase diagram, and discuss the most probable outcome of nonlinear energy transfers, both on the horizontal and on the vertical, in the presence of stratification and rotation.
Interfacial Phenomena of Solvent-diluted Block Copolymers
Creators: name: Cohen, Shai
name: Andelman, David
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A phenomenological mean-field theory is used to investigate the properties of solvent-diluted di-block copolymers (BCP), in which the two BCP components (A and B) form a variety of phases that are diluted by a solvent (S). Using this approach, we model mixtures of di-block copolymers and a solvent and obtained the corresponding critical behavior. In the low solvent limit, we find how the critical point depends on the solvent density. Due to the non-linear nature of the coupling between the A/B and BCP/solvent concentrations, the A/B modulation induces modulations in the polymer-solvent relative concentration with a double wavenumber. The free boundary separating the polymer-rich phase from the solvent-rich one is studied in two situations. First, we show how the presence of a chemically patterned substrate leads to deformations of the BCP film/solvent interface, creation of terraces in lamellar BCP film and even formation of multi-domain droplets as induced by the patterned substrate. Our results are in agreement with previous self-consistent field theory calculations. Second, we compare the surface tension between parallel lamellae coexisting with a solvent phase with that of a perpendicular one, and show that the surface tension has a non-monotonic dependence on temperature. The anisotropic surface tension can lead to deformation of spherical BCP droplets into lens-shaped ones, together with re-orientation of the lamellae inside the droplet during the polymer/solvent phase separation process in agreement with experiment.
description: 12 pages, 13 figures
title: Überlegungen zu möglichen Sitzund Liegepositionen auf der Hochdorf er „Kline"
Creators: name: Jung, Matthias
Publisher: name: University Library Heidelberg
Year: 2014

description: Gegenstand des Textes sind die Körperhaltungen, die auf der „Kline" aus dem Hochdorfer „Fürstengrab" vermutlich eingenommen wurden. Es soll am Fallbeispiel dieses Möbels zum einen gezeigt werden, wie man bereits auf der Grundlage vergleichsweise spärlicher Informationen zu instruktiven Schlußfolgerungen gelangen kann, wenn man sie nur geduldig ausbuchstabiert,
und zum anderen, wie irreführend die vorschnelle Heranziehung von Vergleichsobjekten sein kann.
description: This paper deals with assumed postures for resting on the bronze kline found in the princely tomb of Hochdorf. With the example of this kline I try to show, how instructive conclusions can be drawn, even if only little Information is available, and how misleading it might be to trust analogies.
The role of neighbours selection on cohesion and order of swarms
Creators: name: Calvão, A. M.
name: Brigatti, E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Physics and Society (physics.soc-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences
subject: FOS: Physical sciences
subject: 91-08

description: We introduce a multi-agent model for exploring how selection of neighbours determines some aspects of order and cohesion in swarms. The model algorithm states that every agents' motion seeks for an optimal distance from the nearest topological neighbour encompassed in a limited attention field. Despite the great simplicity of the implementation, varying the amplitude of the attention landscape, swarms pass from cohesive and regular structures towards fragmented and irregular configurations. Interestingly, this movement rule is an ideal candidate for implementing the selfish herd hypothesis which explains aggregation of alarmed group of social animals.
description: 15 pages, 9 figures, Plos One, May 2014
Nonmagnetic impurity resonance states as a test of superconducting pairing symmetry in CeCoIn$_{5}$
Creators: name: Liu, Bin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We theoretically study the effect of a nonmagnetic impurity in heavy fermion superconductor CeCoIn$_{5}$ within a realistic band model and the T-matrix approximation approach. By considering two known possible pairing symmetry candidates $d_{x^{2}-y^{2}}$ and $d_{xy}$, we find that although both total density of states exhibit a similar V-shaped gaplike feature, only the $d_{x^{2}-y^{2}}$-wave pairing symmetry gives rise to robust intragap impurity resonance states reflected by the resonance peaks near the Fermi energy in the local density of states. These features can be readily probed by scanning tunneling microscopy experiments, and are proposed to shed light on the pairing symmetry and provide hints on the microscopic mechanism of unconventional superconductivity in the Ce-based heavy fermion superconductors.
description: 6 pages, 5 figures, Submitted on May 17, 2013. The title changed to describe more properly the content of the paper, and more discussions added
Infrared Saturation and Phases of Gauge Theories with BRST Symmetry
Creators: name: Mader, Valentin
name: Schaden, Martin
name: Zwanziger, Daniel
name: Alkofer, Reinhard
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the infrared limit of the quantum equation of motion of the gauge boson propagator in various gauges and models with a BRST symmetry. We find that the saturation of this equation at low momenta distinguishes between the Coulomb, Higgs and confining phase of the gauge theory. The Coulomb phase is characterized by a massless gauge boson. Physical states contribute to the saturation of the transverse equation of motion of the gauge boson at low momenta in the Higgs phase, while the saturation is entirely due to unphysical degrees of freedom in the confining phase. This corollary to the Kugo-Ojima confinement criterion in linear covariant gauges also is sufficient for confinement in general covariant gauges with BRST- and anti-BRST symmetry, maximal Abelian gauges with an equivariant BRST symmetry, non-covariant Coulomb gauge and in the Gribov-Zwanziger theory.
description: 19 pages; v2: abstract rewritten, a few comments and references added; v3: title changed, major revision of the Introduction and some further minor revisions; version agrees with the one to be published in Eur. Phys. J. C
Electron Correlations and Two-Photon States in Polycyclic Aromatic Hydrocarbon Molecules: A Peculiar Role of Geometry
Creators: name: Aryanpour, K.
name: Shukla, A.
name: Mazumdar, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present numerical studies of one- and two-photon excited states ordering in a number of polycyclic aromatic hydrocarbon molecules: coronene, hexa-peri-hexabenzocoronene and circumcoronene, all possessing $D_{6h}$ point group symmetry versus ovalene with $D_{2h}$ symmetry, within the Pariser-Parr-Pople model of interacting $π$-electrons. The calculated energies of the two-photon states as well as their relative two-photon absorption cross-sections within the interacting model are qualitatively different from single-particle descriptions. More remarkably, a peculiar role of molecular geometry is found. The consequence of electron correlations is far stronger for ovalene, where the lowest spin-singlet two-photon state is a quantum superposition of pairs of lowest spin triplet states, as in the linear polyenes. The same is not true for $D_{6h}$ group hydrocarbons. Our work indicates significant covalent character, in valence bond language, of the ground state, the lowest spin triplet state and a few of the lowest two-photon states in $D_{2h}$ ovalene but not in those with $D_{6h}$ symmetry.
description: 11 pages, 3 figures, 3 tables
title: Vassos Karageorghis und Sabine Rogge (Hrsg.),: Junge zyprische Archäologie, 2003
Creators: name: Brandherm, Dirk
Publisher: name: University Library Heidelberg
Year: 2014

description: Rezension zu: Vassos Karageorghis und Sabine Rogge (Hrsg.),: Junge zyprische Archäologie. Schriften des Instituts für interdisziplinäre Zypern-Studien 2. Waxmann Verlag. Münster/New York/ Müchen/Berlin 2003.144 Seiten, 10 Tafeln.
ISBN 3830913451
Complete characterization of Hadamard powers preserving Loewner positivity, monotonicity, and convexity
Creators: name: Guillot, Dominique
name: Khare, Apoorva
name: Rajaratnam, Bala
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 15B48 (primary), 15A45, 26A48, 26A51 (secondary)

description: Entrywise powers of symmetric matrices preserving positivity, monotonicity or convexity with respect to the Loewner ordering arise in various applications, and have received much attention recently in the literature. Following FitzGerald and Horn [J. Math. Anal. Appl., 1977], it is well-known that there exists a critical exponent beyond which all entrywise powers preserve positive definiteness. Similar phase transition phenomena have also recently been shown by Hiai (2009) to occur for monotonicity and convexity. In this paper, we complete the characterization of all the entrywise powers below and above the critical exponents that are positive, monotone, or convex on the cone of positive semidefinite matrices. We then extend the original problem by fully classifying the positive, monotone, or convex powers in a more general setting where additional rank constraints are imposed on the matrices. We also classify the entrywise powers that are super/sub-additive with respect to the Loewner ordering. Finally, we extend all the previous characterizations to matrices with negative entries. Our analysis consequently allows us to answer a question raised by Bhatia and Elsner (2007) regarding the smallest dimension for which even extensions of the power functions do not preserve Loewner positivity.
description: 19 pages; LaTeX; added complete classification of powers preserving sub-additivity
LE TATTICHE DELL'ACCERCHIAMENTO. ETNOGRAFIA DELLA QUESTIONE CRIMINALE NO TAV
Creators: name: CHIARAMONTE, XENIA MANUELA
Publisher: name: Universit� degli Studi di Milano
Year: 2017

description: Le tattiche dell?accerchiamento (The tactics of encircling) are those mechanisms through which a social conflict is criminalized. The term is borrowed from Michel Foucault?s concept of strat�gie du pour tour, a process conducted by different agencies of control that consists of generating fear and constructing exemplar cases on the base of a commune dispositive: the defense of society. The work detects the micro-tactics of this strategy through an analysis of media discourse and an ethnography of the two major penal process against the opposition to the Turin-Lyon high-speed railway project (No Tav Movement). The main argument is that these tactics of encircling reveal a Positivistic legacy and a blend of that with the principle of the Reason of State. The counter-conducts to these tactics of encircling have been performed by the No Tav movement during the last 12 years to reaching the point of a resistance not only to a train but to an overall neoliberal governmentality, in which law mimes the market, is applied by a judicial field that functions as the manager of security and protection, and treats the population through an attempt of separating the good and the bad population.
Minimal sets determining the topological centre of the algebra LUC(G)*
Creators: name: Ferri, Stefano
name: Neufang, Matthias
name: Pachl, Jan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 22A10, 43A10, 43A15

description: The Banach algebra LUC(G)* associated to a topological group G has been of interest in abstract harmonic analysis. A number of authors have studied the topological centre of LUC(G)*, which is defined as the set of elements in LUC(G)* for which the left multiplication is w*--w*-continuous on LUC(G)*. Several recent works show that for a locally compact group G it is sufficient to test the continuity of the left multiplication at just one specific point in order to determine whether an element of LUC(G)* belongs to the topological centre. In this work we extend some of these results to a much larger class of groups which includes many non-locally compact groups as well as all the locally compact ones. This answers a question raised by H.G. Dales. We also obtain a corollary about the topological centre of any subsemigroup of LUC(G)* containing the uniform compactification of G. In particular, we prove that there are sets of just one point determining the topological centre of the uniform compactification itself.
description: 7 pages; version 2 incorporates minor editing changes
THE ROLE OF ARGININE METHYLATION IN MIRNA BIOGENESIS INVESTIGATED BY MS-PROTEOMICS
Creators: name: SPADOTTO, VALERIA
Publisher: name: Universit� degli Studi di Milano
Year: 2017

description: MicroRNAs (miRNAs) are short, non-coding RNA molecules that fine tune gene expression at the post-transcriptional level. The efficient miRNA processing is fundamental to maintain their correct levels in the cell. However, although microRNA biogenesis is a tightly controlled pathway, alterations in this process occur in different pathological conditions, including cancer. Hence, dissecting the molecular mechanisms underlying miRNA biogenesis is crucial to understand how aberrant miRNA patterns are generated. The processing step operated by the Large Drosha Complex (LDC), which is crucial and rate limiting for the production of mature miRNAs, occurs in the nucleus and it consists in the cleavage of the primary miRNAs (pri-miRNAs) into the precursor miRNAs (pre-miRNAs). In our previous MS-based analysis of the cellular methylome, we showed that protein methylation frequently occurs on the majority of the LDC subunits [1], suggesting for the first time the possibility that this post translational modification (PTM) could contribute to the regulation of miRNA biogenesis. To investigate the role of protein methylation in the regulation of the LDC, we thoroughly characterized the methylated sites on the subunits of the complex, thus generating the first comprehensive and high-confident methyl-proteome of the LDC. By modulating the expression of PRMT1, the predominant Protein Arginine Methyltransferase in mammalian cells, we analyzed how methylations change at specific sites of distinct LDC subunits, thus identifying novel PRMT1 substrates. The alteration of the LDC-methylation state upon PRMT1 depletion correlated with an impairment of the pri- to- pre-miRNA processing step, which resulted in the massive deregulation of mature miRNA expression. Although the detailed molecular mechanism remains to be fully deciphered, the results described in this thesis uncover a key role of arginine methylation in the regulation of the LDC activity and, consequently, in miRNA biogenesis.
Elliptic solutions of generalized Brans-Dicke gravity with a non-universal coupling
Creators: name: Alimi, J. -M.
name: Golubtsova, A. A.
name: Reverdy, V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study a model of the generalized Brans-Dicke gravity presented in both the Jordan and in the Einstein frames, which are conformally related. We show that the scalar field equations in the Einstein frame are reduced to the geodesics equations on the target space of the nonlinear sigma-model. The analytical solutions in elliptical functions are obtained when the conformal couplings are given by reciprocal exponential functions. The behavior of the scale factor in the Jordan frame is studied using numerical computations. For certain parameters the solutions can describe an accelerated expansion. We also derive an analytical approximation in exponential functions.
description: 24 pages, 3 figures; v2: typos fixed, few remarks and references added; version to appear in EPJC
The holographic dilaton
Creators: name: Hoyos, Carlos
name: Kol, Uri
name: Sonnenschein, Jacob
name: Yankielowicz, Shimon
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study a set of examples of holographic duals to theories with spontaneous breaking of conformal invariance in different dimensions. The geometries are domain walls interpolating between two AdS spaces, with a non-trivial background scalar field dual to a relevant operator. We comment on a subtlety in the low momentum expansion pointed out in arXiv:1304.3051 for the case of background gravity and revise the dynamical gravity results of arXiv:1207.0006, where the dilaton pole was missing in the scalar-scalar and tensor-tensor two-point functions. We compute the energy-momentum tensor and scalar two-point functions and show that there is indeed a massless dilaton pole.
description: 28 pages. v2: references added. v3: published version in JHEP
M-strings, Elliptic Genera and N=4 String Amplitudes
Creators: name: Hohenegger, Stefan
name: Iqbal, Amer
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study mass-deformed N=2 gauge theories from various points of view. Their partition functions can be computed via three dual approaches: firstly, (p,q)-brane webs in type II string theory using Nekrasov's instanton calculus, secondly, the (refined) topological string using the topological vertex formalism and thirdly, M theory via the elliptic genus of certain M-strings configurations. We argue for a large class of theories that these approaches yield the same gauge theory partition function which we study in detail. To make their modular properties more tangible, we consider a fourth approach by connecting the partition function to the equivariant elliptic genus of R^4 through a (singular) theta-transform. This form appears naturally as a specific class of one-loop scattering amplitudes in type II string theory on T^2, which we calculate explicitly.
description: 65 pages, a section on calculation of partition function using Nekrasov's instanton calculus is added