cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Betonermüdung – Sicherheiten und Entwicklungspotenziale
Creators: name: Schmidt, Boso
name: Schneider, Sebastian
name: Marx, Steffen
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2019
Subjects: subject: Ermüdung
subject: Beton
subject: Nachweiskonzept
subject: Sicherheit
subject: ultra-hochfester Beton
subject: fatigue
subject: concrete
subject: design concept
subject: safety
subject: ultra-high strength concrete
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Das tatsächliche Sicherheitsniveau bei der Ermüdungsbemessung von druckschwellbeanspruchtem Beton ist derzeit unbekannt. In diesem Beitrag werden das Nachweiskonzept gegen Betonermüdung nach Model Code 2010 (FIB 2013) vorgestellt und die enthaltenen Sicherheiten diskutiert. Anhand des Vergleichs von stochastisch ausgewerteten bestehenden Ermüdungsuntersuchungen an ultra-hochfesten Betonen mit Wöhlerlinien nach Model Code 2010 werden Entwicklungspotenziale aufgezeigt. Die vergleichenden Untersuchungen deuten auf ein höheres Sicherheitsniveau des Ermüdungswiderstands im Vergleich zur statischen Bemessung hin.
description: The safety level for the fatigue design of concrete under compression is currently unknown. In this paper, the design concept for fatigue loaded concrete according to Model Code 2010 (FIB 2013) is presented and the contained safety factors are discussed. The comparison of stochastically evaluated existing fatigue tests on ultra-high-strength concretes with S-N-lines according to Model Code 2010 shows development potentials. The comparative investigations indicate a higher safety level of the fa-tigue resistance compared to the static design.
Observation of ER UMa Stars
Creators: name: Kato, Taichi
name: Nogami, Daisaku
name: Baba, Hajime
name: Masuda, Seiji
name: Matsumoto, Katsura
name: Kunjaya, Chatief
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: ER UMa stars are a recently recognized small subgroup of SU UMa-type dwarf novae, which are characterized by the extremely high outburst frequency and short (19--48 d) supercycles. From the current thermal-tidal disk instability scheme, they are considered to be high mass-transfer SU UMa-type dwarf novae, and comprise a link to "permanent superhumpers" below the period gap. They do not only provide an opportunity to test the applicability of thermal-tidal instability model but also pose problems on the origin of high mass-transfer in short orbital-period cataclysmic variables. A historical review of this subgroup and recent topics of ER UMa stars, the unique pattern of superhump evolution and the "helium ER UMa analog" (CR Boo), are also discussed.
description: 10 pages, 6 figures, reproduction of the proceeding paper in 1999 for easier accessibility (Disk Instabilities in Close Binary Systems. 25 Years of the Disk-Instability Model. Proceedings of the Disk-Instability Workshop held on 27-30 October, 1998; Frontiers Science Series No. 26. Universal Academy Press, Inc., 1999., p.45.)
title: Essential indexicality
Creators: name: Thomson, Euan N. S.
Publisher: name: University of Glasgow
Year: 1984

description: The idea which provoked this essay is that sometimes an indexical term is essential to the expression of a truth. I explore some consequences of this idea, whether or not it is true, and investigate why anyone should believe that it is. As to the consequences of the idea, I strongly hold that they are much more dramatic than is usually supposed, and that casual acceptance or rejection of it is therefore impermissible Since that nonchalance is general, this is one of the main contentions of the thesis. In general I argue from the supposition that the nature of temporality and selfhood necessitates indexical forms of expression, and therefore oppose the 'absolute conception' of the world as a body of impersonal and eternal truth. In the course of this polemic I discover an argument against current modal semantics. However, the subjectivist position which I adopt is found to involve a host of unpopular metaphysical consequences, and doubt is cast on its own expressibi1ity. The reader may well come to feel that the absolute conception does not suffer by comparison. Finally, I put the concept of essential, indexicality to use as an exegetical instrument, and argue that it brings out a central feature of many irrationalist or subjectivist philosophies. I find it hidden also in several innocent-seeming forms of expression to which analytic philosophers are much given and which may, therefore, commit them to doctrines they would gladly disown.
Designing and developing a website for information recourses related to indicators for monitoring and evaluation of science, technology and innovation) STI)
Publisher: name: Iranian Research Institute for Information Science and Technology (IranDoc)
Year: 2018

description: So far, many indicators for evaluation of science, technology and innovation have been presented in various documents in Iran. Also, many indicators have been mentioned in the reports of international organizations. Selection and use of the indicators is difficult for policy makers and researchers because of the abundance and distribution of them in various domestic and international documents and reports. Therefore, access to these indicators through a single website with the ability to organize and online search can facilitate the users’ activities. Therfore, a website has been designed and developed for information resourses related to indicators for monitoring and evaluation of science, technology and innovation. The research method is mixed with the study of documents and system design. In the first step of this research, the data related to indicators, information resources and organization were gathered using the study of national and international documents. Then, in the second step, a website was designed and developed. This website provides an image of national and international organizations working in this field, and categorizes the evaluation indicators for researchers and policy makers. It introduces the key information resources related to indicators such as book, article, thesis, government report, national document, research project. The database of the website has simple and advanced search capabilities in both Persian and English among the indicators, uses the equivalent terms and provides links to global and national resources. Users can help to update and mature the database with offering new indicators and information resources. This website is valuable for policy makers and researchers because it makes the indicators, organizations, and information resources related to monitoring and evaluation of science, technology and innovation more visible and accessible.
Reporting an Experience on Design and Implementation of e-Health Systems on Azure Cloud
Creators: name: Lu, Shilin
name: Ranjan, Rajiv
name: Strazdins, Peter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computers and Society (cs.CY)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Electronic Health (e-Health) technology has brought the world with significant transformation from traditional paper-based medical practice to Information and Communication Technologies (ICT)-based systems for automatic management (storage, processing, and archiving) of information. Traditionally e-Health systems have been designed to operate within stovepipes on dedicated networks, physical computers, and locally managed software platforms that make it susceptible to many serious limitations including: 1) lack of on-demand scalability during critical situations; 2) high administrative overheads and costs; and 3) in-efficient resource utilization and energy consumption due to lack of automation. In this paper, we present an approach to migrate the ICT systems in the e-Health sector from traditional in-house Client/Server (C/S) architecture to the virtualised cloud computing environment. To this end, we developed two cloud-based e-Health applications (Medical Practice Management System and Telemedicine Practice System) for demonstrating how cloud services can be leveraged for developing and deploying such applications. The Windows Azure cloud computing platform is selected as an example public cloud platform for our study. We conducted several performance evaluation experiments to understand the Quality Service (QoS) tradeoffs of our applications under variable workload on Azure.
description: Submitted to third IEEE International Conference on Cloud and Green Computing (CGC 2013)
Researcher Insights - The Neuroscience of Sleep.pdf
Creators: name: Lennie, Kristine
name: Greco, Viviana
Publisher: name: figshare
Year: 2022
Subjects: subject: Neuroscience
subject: Neuroscience and Physiological Psychology
subject: 110999 Neurosciences not elsewhere classified
subject: FOS: Clinical medicine
subject: Behavioral Neuroscience

description: Welcome to ‘Researcher Insights’ – Researcher’s brand new collection of content specifically tailored to those working in the life sciences.
 Here, you will find insights into the current field, interviews with practitioners and book authors, as well as high-quality contributions from the Researcher community. Each piece is written with our audience in mind, created with or by researchers and experts in the field. Researcher has always helped facilitate the conversation - but now we want to start it.
 Our pilot issue will focus on neuroscience, more specifically, The Neuroscience of Sleep.
Quantifizierung und Prognose der Betonschädigung beim Säureangriff
Creators: name: Gerlach, Jesko
name: Mahlbacher, Markus
name: Rozanski, Corinna
name: Haist, Michael
name: Lohaus, Ludger
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2019
Subjects: subject: Chemischer Betonangriff
subject: Dauerhaftigkeitsbemessung
subject: Diffusions-Abtrags-Modell
subject: Computertomographie
subject: Magnetresonanztomographie
subject: Chemical attack
subject: Durability design
subject: Diffusion-erosion-model
subject: Computer tomograph
subject: Nuclear magnetic resonance tomography
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Performance-basierte Konzepte zur Sicherstellung der Dauerhaftigkeit sehen vor, die Eignung eines Betons anhand von anerkannten Prüfverfahren und Leistungskriterien nachzuweisen. Bei säurebeanspruchten Bauteilen ist jedoch zu beachten, dass diese am Ende ihrer Nutzungsdauer reduzierte Abmessungen aufweisen können. Demnach ist die alleinige Betrachtung von baustofflichen Leistungskriterien i. d. R nicht ausreichend und bedingt einen bauteilbezogenen Nachweis. Dies erfordert ein entsprechendes Prognosemodell, das die zeitabhängige Entwicklung der Schädigung beschreibt. Vor diesem Hintergrund wird ein Diffusions-Abtrags-Modell vorgestellt, das durch die Berücksichtigung des Abtrags der geschädigten Betonrandzone eine realitätsnähere Prognose als derzeit gängige Modelle ermöglicht. Darüber hinaus werden unterschiedliche Methoden zur Erfassung der Schädigung betrachtet, aus denen erforderliche Modellparameter abgeleitet werden können.
description: Performance-based durability design of concrete structures is usually based on performance tests with predefined performance criteria. However, considering acid attack on concrete structures, it must be kept in mind that reduced structural dimensions have to be assumed at the end of the service life due to the formation of a corroded surface layer with low mechanical strength. Consequently, the exclusive consideration of material resistance is not sufficient and the specification of a performance limit has to be in conjunction with required structural dimensions. Therefore, it becomes necessary to consider the degradation of the structural component. For this purpose, a newly developed diffusion-erosion-model is presented. Furthermore, several methods for the determination of acid-induced concrete degradation are considered. A crucial requirement for the derivation of model’s parameters.
Polarization Invariants and Retrieval of Surface Parameters Using Polarization Measurements in Remote Sensing Applications
Creators: name: Shestopaloff, Yu. K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Using polarization measurements in remote sensing and optical studies allows retrieving more information. We consider relationship between the reflection coefficients of plane and rough surfaces for linearly polarized waves. Certain polarization properties of reflected waves and polarization invariants, in particular at incident angle of forty five degrees, allow finding amplitude and phase characteristics of reflected waves. Based on this study, we introduce methods for finding dielectric permittivity, temperature and geometrical characteristics of observed surfaces. Experimental results prove that these methods can be used for different practical purposes in technological and remote sensing applications, in a broad range of electromagnetic spectrum.
description: 37 pages, 7 figures, 1 table
Bayesian test of significance for conditional independence: The multinomial model
Creators: name: Andrade, Pablo de Morais
name: Stern, Julio Michael
name: Pereira, Carlos Alberto de Bragança
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computation (stat.CO)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: G.3
subject: 47N30

description: Conditional independence tests (CI tests) have received special attention lately in Machine Learning and Computational Intelligence related literature as an important indicator of the relationship among the variables used by their models. In the field of Probabilistic Graphical Models (PGM)--which includes Bayesian Networks (BN) models--CI tests are especially important for the task of learning the PGM structure from data. In this paper, we propose the Full Bayesian Significance Test (FBST) for tests of conditional independence for discrete datasets. FBST is a powerful Bayesian test for precise hypothesis, as an alternative to frequentist's significance tests (characterized by the calculation of the \emph{p-value}).
description: 24 pages, 33 figures
Rani Chuni Dorje and Mary H. Scott at opening of Kalimpong Home for the Blind
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2020
Subjects: Blind--Education
Women, Tibetan

description: Rani Chuni Dorje (a.k.a. Rani Choni Dorje), sister of the Maharaja of Sikkim, and Mary H. Scott at opening of Blind School, Kalimpong
Multi-stage approach to travel-mode segmentation and classification of gps traces
Creators: name: Zhang, Lijuan
name: Dalyot, Sagi
name: Eggert, Daniel
name: Sester, Monika
Publisher: name: Göttingen : Copernicus GmbH
Year: 2011
Subjects: subject: Acquisition
subject: Data mining
subject: Pattern
subject: Recognition
subject: Classification
subject: GPS/INS
subject: Segmentation
subject: Mapping
subject: system
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: This paper presents a multi-stage approach toward the robust classification of travel-modes from GPS traces. Due to the fact that GPS traces are often composed of more than one travel-mode, they are segmented to find sub-traces characterized as an individual travel-mode. This is conducted by finding individual movement segments by identifying stops. In the first stage of classification three main travel-mode classes are identified: pedestrian, bicycle, and motorized vehicles; this is achieved based on the identified segments using speed, acceleration and heading related parameters. Then, segments are linked up to form sub-traces of individual travel-mode. After the first stage is achieved, a breakdown classification of the motorized vehicles class is implemented based on sub-traces of individual travel-mode of cars, buses, trams and trains using Support Vector Machines (SVMs) method. This paper presents a qualitative classification of travel-modes, thus introducing new robust and precise capabilities for the problem at hand.
Moehringia muscosa L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: M. muscosa L. Cat. 50. 3: In den Vispertälern anscheinend selten (Hirschmann).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
title: Italian verista opera libretti, 1890-1920: A historical, structural and statistical survey
Creators: name: Nannetti, Remo Lorenzo
Publisher: name: University of Glasgow
Year: 1984

description: Part One, ""Verismo" in Italian Opera: A Historical Perspective", provides an overview of Italian operatic activity between the years 1890 and 1920 inclusive and is subdivided into four chapters which follow a roughly chronological sequence. Chapter One, ""Cavalleria" and the Preceding Decade", covers the period 1860 to 1890 and describes the fortunes of the two principal music publishers, Rioordi and Sonsogno. Chapter Two, "Towards a Definition of "Verismo"", shows the extent of the gulf between literary and operatic realism and examines contemporary attitudes to the question. Chapter Three, "Growth and Consolidation; 1890-96", demonstrates the extent to which Sonzogno capitalized on the immense success of "Cavalleria" and chronicles the methods used to promote "verismo puro" as a viable operatic commodity. Chapter Four, "Diversification and Decline; 1897-1920", describes how "verismo puro", despite being fragmented into a series of closely allied genres (each of which is examined and commented upon), enjoyed several revivals in the first two decades of the twentieth century, none of which could arrest the downward trend in the fortunes of Casa Sonaogno.
Resonances of Kalb-Ramond field on symmetric and asymmetric thick branes
Creators: name: Du, Yun-Zhi
name: Zhao, Li
name: Zhong, Yi
name: Fu, Chun-E
name: Guo, Heng
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we investigate the localization of the Kalb-Ramond field on symmetric and asymmetric thick branes, which are generated by a background scalar field. In order to localize the Kalb-Ramond field, we introduce a coupling with the background scalar field, and find that there exist some Kaluza-Klein resonant modes. For the case of symmetric brane, we seek the resonances by using the relative probability method and transfer matrix method, and obtain the same result for the two methods. For the asymmetric case, we use the transfer matrix method. We find that the number of resonances will decrease with the increase of the asymmetry.
description: 12 pages, 9 figures
Einfluss der Düngung auf die Frosthärte stecklingsvermehrter Rosa 'Sommerabend' und Prunus laurocerasus 'Rotundifolia'
Creators: name: Mensing, Petra
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Frosthärte
subject: stecklingsvermehrte Gehölze
subject: Düngung
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Diffusive Shock Acceleration at Cosmological Shock Waves
Creators: name: Kang, Hyesung
name: Ryu, Dongsu
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We reexamine nonlinear diffusive shock acceleration (DSA) at cosmological shocks in the large scale structure of the Universe, incorporating wave-particle interactions that are expected to operate in collisionless shocks. Adopting simple phenomenological models for magnetic field amplification (MFA) by cosmic-ray (CR) streaming instabilities and Alfv'enic drift, we perform kinetic DSA simulations for a wide range of sonic and Alfv'enic Mach numbers and evaluate the CR injection fraction and acceleration efficiency. In our DSA model the CR acceleration efficiency is determined mainly by the sonic Mach number Ms, while the MFA factor depends on the Alfv'enic Mach number and the degree of shock modification by CRs. We show that at strong CR modified shocks, if scattering centers drift with an effective Alfv'en speed in the amplified magnetic field, the CR energy spectrum is steepened and the acceleration efficiency is reduced significantly, compared to the cases without such effects. As a result, the postshock CR pressure saturates roughly at ~ 20 % of the shock ram pressure for strong shocks with Ms>~ 10. In the test-particle regime (Ms
description: 23 pages including 4 figures and 1 table. Accepted for publication in ApJ
"Prominente Wörter" im öffentlichen und privaten Sprachgebrauch : wortsemantische Aspekte und empirische Analysen zu Schlüsselwörtern des öffentlichen Sprachgebrauchs
Creators: name: Oheim, Lennart
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Öffentlicher Sprachgebrauch
subject: Wortsemantik
subject: empirische Ermittlung von Wortinhalten
subject: Dewey Decimal Classification::400 | Sprache, Linguistik::430 | Deutsch

description: [no abstract]
Quantum phase transitions of three-level atoms interacting with a one-mode electromagnetic field
Creators: name: Cordero, Sergio
name: López-Peña, Ramón
name: Castaños, Octavio
name: Nahmad-Achar, Eduardo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We apply the energy surface method to study a system of Na three-level atoms interacting with a one-mode radiation field in the Ξ, Λand V configurations. We obtain an estimation of the ground-state energy, the expectation value of the total number of excitations, and the separatrix of the model in the interaction parameter space, and compare the results with the exact solutions. We have first and second-order phase transitions, except for the V configuration which only presents second-order phase-transitions.
description: 5 pp., 8 figures
title: Das deutsche Sozialmodell in der Krise
title: Die Entwicklung vom inklusiven zum exklusiven Bismarck'schen Sozialstaat
titleType: AlternativeTitle
Creators: name: Bosch, Gerhard
Publisher: name: DuEPublico: Duisburg-Essen Publications Online, University of Duisburg-Essen, Germany
Year: 2018

description: In den letzten 20 Jahren ist das deutsche Sozialsystem in hohem Tempo umgebaut worden. Fortschritt und Sozialabbau lagen eng beieinander. Insgesamt ist das Sozialmodell durch den wachsenden Niedriglohnsektor exklusiver geworden, nicht zuletzt weil im Bismarck'schen deutschen Sozialsystem viele Leistungen an den vorherigen Verdienst anknüpfen.
Die Integration der ostdeutschen Bevölkerung in das westdeutsche Sozialsystem, die Einführung der Pflegeversicherung und des Gesundheitsfonds in der Krankenversicherung waren beachtliche sozialpolitische Reformleistungen. Weitreichende Auswirkungen auf das Sozialsystem hatten aber auch die Erosion des deutschen Tarifsystems und die Deregulierung des Arbeitsmarktes durch die Hartz-Gesetze. Die Absenkung des Rentenniveaus wird infolge der raschen Expansion des Niedriglohnsektors zu wachsender Altersarmut führen. Trotz wachsender Frauenerwerbstätigkeit kommt die Reform des deutschen Familienmodells nur mühsam voran, da das alte Alleinernährermodell noch massiv subventioniert wird.
Notwendig ist ein Pfadwechsel zu einem inklusiven Bismarck'schen Sozialstaat mit hoher Tarifbindung, besserer Vereinbarkeit von Beruf und Familie und mehr Bildungsinvestitionen.
title: Visionen aus dem Inferno - Kunst gegen das Vergessen. Ausstellung mit Bildern und Zeichnungen von Adolf Frankl (Bratislava 1903 -1983 Wien) im Germanischen Nationalmuseum vom 28.09. bis 30.11.1997
Creators: name: Peters, Ursula
Publisher: name: University Library Heidelberg
Year: 2016

description: [nicht vorhanden / not available]
Boundary-value problems with non-local condition for degenerate parabolic equations
Creators: name: Rassias, J. M.
name: Karimov, E. T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35K20, 35K65

description: In this work we deal with degenerate parabolic equations with three lines of degeneration. Using "a-b-c" method we prove the uniqueness theorems defining conditions to parameters. We show nontrivial solutions for considered problems, when uniqueness conditions to parameters, participating in the equations are not fulfilled.
description: 7 pages
Dune migration and sand transport rates in tidal estuaries: The example of the river elbe
Creators: name: Zorndt, Anna
name: Wurpts, Andreas
name: Schlurmann, Torsten
name: Ohle, Nino
name: Strotmann, Thomas
Publisher: name: Reston : American Society of Civil Engineers
Year: 2010
Subjects: subject: Cross-Correlation Method
subject: Elbe Estuary
subject: Sand Transport
subject: Complex sands
subject: Cross correlation methods
subject: Cross correlation techniques
subject: Data sets
subject: Dune Migration
subject: Germany
subject: Hydrodynamic boundary conditions
subject: Migration patterns
subject: Migration rates
subject: Regular patterns
subject: River Elbe
subject: River runoffs
subject: Sand dunes
subject: Sand transport
subject: Sand transport rate
subject: Sediment management
subject: Tidal estuary
subject: Correlation methods
subject: Estuaries
subject: Offshore structures
subject: Coastal engineering
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: Large parts of the tidal estuary of river Elbe (Germany) are characterized by regular patterns of sand dunes. They are presumed to evolve due to complex sand transport mechanisms and show multi-faceted migration patterns. Direction and magnitude of their migration are influenced by hydrodynamic boundary conditions such as river runoff and tides. Dune Migration can lead to residual sand transport rates, depending on its direction and magnitude and the dune's characteristics. The understanding of dune migration patterns and associated sand transport is the basis of an effective sediment management as well as an important requirement for planning offshore structures. This study focuses on methods for computing migration and sand transport rates in automated ways. In a comparison and validation of different approaches, a cross-correlation technique was found to produce best results. From a unique data set of up to six annual bathymetrical multi-beam soundings between 1995 and 2010, dune characteristics and migration rates were processed and analysed autonomously. The findings show that over the long run, average dune migration and sand transport rates in the present study reach are directed upstream.
Optische Spinauswahlregeln in Halbleiternanostrukturen
Creators: name: Pfalz, Stefan
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Halbleiter
subject: Elektronenspin
subject: Auswahlregeln
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Real-time dynamics of false vacuum decay
Creators: name: Batini, Laura
name: Chatrchyan, Aleksandr
name: Berges, Jürgen
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2023
Subjects: false vacuum: decay
higher-order: 1
field theory: scalar
two-point function
ground state
expansion 1/N
effective action
asymmetry
nonperturbative
two-particle
boundary condition

description: We investigate false vacuum decay of a relativistic scalar field initialized in the metastable minimum of an asymmetric double-well potential. The transition to the true ground state is a well-defined initial-value problem in real time, which can be formulated in nonequilibrium quantum field theory on a closed time path. We employ the non-perturbative framework of the two-particle irreducible (2PI) quantum effective action at next-to-leading order in a large-N expansion. We also compare to classical-statistical field theory simulations on a lattice in the high-temperature regime. By this, we demonstrate that the real-time decay rates are comparable to those obtained from the conventional Euclidean (bounce) approach. In general, we find that the decay rates are time dependent. For a more comprehensive description of the dynamics, we extract a time-dependent effective potential, which becomes convex during the nonequilibrium transition process. By solving the quantum evolution equations for the one- and two-point correlation functions for vacuum initial conditions, we demonstrate that quantum corrections can lead to transitions that are not captured by classical-statistical approximations.
Euler Equations Related to the Generalized Neveu-Schwarz Algebra
Creators: name: Zuo, Dafeng
Publisher: name: arXiv
Year: 2013
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper, we study supersymmetric or bi-superhamiltonian Euler equations related to the generalized Neveu-Schwarz algebra. As an application, we obtain several supersymmetric or bi-superhamiltonian generalizations of some well-known integrable systems including the coupled KdV equation, the 2-component Camassa-Holm equation and the 2-component Hunter-Saxton equation. To our knowledge, most of them are new.
title: From Bretton woods to the great moderation: essays in British post-war macroeconomic history
Creators: name: Banerjee, Joshua J.
Publisher: name: London School of Economics and Political Science (LSE)
Year: 2025

description: This thesis contributes to our understanding of British macroeconomic history in the decades following World War II until the eve of the Global Financial Crisis. It visits pivotal historical episodes, analyses pre-eminent policy issues, and examines some of the most contentious academic debates of the day. Particular focus is given to macroeconomic fluctuations in the short and medium-run, in contrast to the extant economic history literature centred largely on economic growth and comparative performance at the long-run horizon. The first chapter investigates the impact of fiscal policy on the current account balance under the Bretton Woods system of fixed exchange rates. Contrary to established opinion, econometric modelling reveals that fiscal laxity was not responsible for driving the UK’s chronic imbalances and rather said imbalances must be understood with reference to a broader menu of economic shocks. The second chapter analyses the controversial issue of North Sea oil’s impact on the exchange rate, terms of trade, and performance of the traded manufactures sector. Results from vector autoregressive models indicate that oil did exert a considerable impact, although it was not uniquely responsible for the difficulties bedevilling the manufacturing sector. Furthermore, it is argued that government policy towards management of the windfall revenues missed key opportunities therein. Finally, the third chapter takes up the question of aggregate cyclical dynamics, with specific reference to a debate between leading Keynesian economists regarding the true autonomous source of demand in an open-economy. Evidence from frequency domain analysis suggests that both sides of the debate overstated their positions and that a synthesis view appears perfectly reasonable in light of evidence obtained across varying frequency scales. Taken as a whole, the thesis reveals substantive differences between how contemporaneous actors and policy makers understood open-economy macroeconomic policy, versus the insights revealed by more recent econometric techniques and theoretical developments. The potential policy failures resulting from this disparity are considerable.
A z=3.045 Lyman alpha emitting halo hosting a QSO and a possible candidate for AGN-triggered star-formation
Creators: name: Rauch, Michael
name: Becker, George D.
name: Haehnelt, Martin G.
name: Carswell, Robert F.
name: Gauthier, Jean-Rene
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this third paper in a series on the nature of extended, asymmetric Lyman alpha emitters at z ~ 3 we report the discovery, in an ultra-deep, blind, spectroscopic long-slit survey, of a Lyman alpha emitting halo around a QSO at redshift 3.045. The QSO is a previously known, obscured AGN. The halo appears extended along the direction of the slit and exhibits two faint patches separated by 17 proper kpc in projection from the QSO. Comparison of the 2-dimensional spectrum with archival HST ACS images shows that these patches coincide spatially with emission from a peculiar, dumbbell-shaped, faint galaxy. The assumptions that the Lyman alpha emission patches are originating in the galaxy and that the galaxy is physically related to the QSO are at variance with photometric estimates of the galaxy redshift. We show, however, that a population of very young stars at the redshift of the QSO may fit the existing rest frame broad band UV photometry of the galaxy. If this scenario is correct then the symmetry of the galaxy in continuum and Lyman alpha emission, the extension of the QSO's Lyman alpha emission in its direction, and the likely presence of a young stellar population in close proximity to a (short-lived) AGN suggest that this may be an example of AGN feedback triggering external star formation in high redshift galaxies.
description: MNRAS, in press
A survey of service oriented architecture systems testing
Creators: name: Shamsoddin-Motlagh, Ebrahim
Publisher: name: arXiv
Year: 2012
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Service oriented architecture (SOA) is one of the latest software architectures. This architecture is created in direction of the business requirements and removed the gap between softwares and businesses. The software testing is the rising cost of activities in development software. SOA has different specifications and features proportion of the other software architectures. First this paper reviews SOA testing challenges and existing solution(s) for those challenges. Then that reports a survey of recent research to SOA systems testing, that covers both functional and non-functional testing. Those are presented for different levels of functional testing, including unit, integration, and regression testing.
Entwicklung eines Prognose- und Entscheidungsmodells zur Braunrostbekämpfung in Winterroggen und Winterweizen
Creators: name: Räder, Thomas
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Braunrost
subject: Winterroggen
subject: Winterweizen
subject: Simulationsmodell
subject: Virulenzdynamik
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Potential of systematically generated training datasets on the accuracy and generalization of AI-based approaches for the automated identification of machine control signals
Creators: name: Gönnheimer, Philipp
name: Ströbel, Robin
name: Roßkopf, Alexander
name: Dörflinger, Roman
name: Walter, Iris
name: Becker, Jürgen
name: Fleischer, Jürgen
Publisher: name: Elsevier
Year: 2023
Subjects: Artificial intelligence
Automation
Computer numerical control (CNC)
Digital manufacturing system
Identification
Machine tool

description: The automated identification of data sources in machine tools is steadily gaining importance due to the growing use of data-driven methods. However, due to small size and volatile information content of training data sets, even promising AI approaches are increasingly reaching their limits. With systematically generated unique reference trajectories, large-scale data sets with high information content can be created. In this paper, the effects of these data sets on accuracy and generalization of AI-based approaches are investigated in comparison to the training with process data. In particular, the subset optimizing the identification of real-world process data is addressed.
Experimental characterization and constitutive modeling of the non-linear stress–strain behavior of unidirectional carbon–epoxy under high strain rate loading
Creators: name: Koerber, Hannes
name: Kuhn, Peter
name: Ploeckl, Marina
name: Otero, Fermin
name: Gerbaud, Paul-William
name: Rolfes, Raimund
name: Camanho, Pedro P.
Publisher: name: Heidelberg : Springer Verlag
Year: 2018
Subjects: subject: Carbon–epoxy
subject: Composites
subject: Constitutive modeling
subject: Strain rate effects
subject: Viscoplasticity
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: The mechanical response of IM7-8552 carbon epoxy was investigated for transverse tension and transverse tension/in-plane shear loadings at static and dynamic strain rates using transverse tension and off-axis tension specimens. The dynamic tests were carried out on a split-Hopkinson tension bar at axial strain rates from 113 to 300 s - 1. With the already available off-axis and transverse compression test data for IM7-8552, a comprehensive data set is available now, which can be used for validation and calibration of numerical models. The measured axial stress–strain response was simulated using a fully 3D transversely isotropic elastic–viscoplastic constitutive model. The constitutive model represents a viscoplastic extension of the transversely-isotropic plasticity model developed by the authors (Vogler et al. in Mech Mater 59:50–64, 2013). An invariant based failure criterion is added to the model to be able to predict the strength for a given orientation and strain rate accurately. The strain rate dependency of the elastic and ultimate strength properties is introduced in the model through scaling functions. A good correlation between the measured and numerically predicted stress–strain response and failure of the specimens was achieved for all specimen types and both strain rate regimes.
Moehringia trinervia
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: M. trinervia (L.) Clairv. Cat. 50. l: Trient (J.); Le Brocard (Closuit); Le Cergneux (idem); Outre-Rhône (J., Gams). - 3: Mont- Chemin (J., Closuit); Stalden-Kalpetran (Becherer und Kilcher); Stalden-Huteggen (A. Keller). - 3a: Simplon-Dorf; Gondo; Alpien; unteres Zwischbergental (alles: Becherer).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Higher-Loop Structural Properties of the $β$ Function in Asymptotically Free Vectorial Gauge Theories
Creators: name: Shrock, Robert
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate some higher-loop structural properties of the $β$ function in asymptotically free vectorial gauge theories. Our main focus is on theories with fermion contents that lead to an infrared (IR) zero in $β$. We present analytic and numerical calculations of the value of the gauge coupling where $β$ reaches a minimum, the value of $β$ at this minimum, and the slope of $β$ at the IR zero, at two-, three-, and four-loop order. The slope of $β$ at the IR zero is relevant for estimates of a dilaton mass in quasiconformal gauge theories. Some inequalities are derived concerning the dependence of the above quantities on loop order. A general inequality is derived concerning the dependence of the shift of the IR zero of $β$, from the $n$-loop to the $(n+1)$-loop order, on the sign of the $(n+1)$-loop coefficient in $β$. Some results are also given for gauge theories with ${\cal N}=1$ supersymmetry.
description: 22 pages, 4 figures
Interplay between localization and absorption in disordered waveguides
Creators: name: Yamilov, Alexey G.
name: Payne, Ben
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: This work presents results of ab-initio simulations of continuous wave transport in disordered absorbing waveguides. Wave interference effects cause deviations from diffusive picture of wave transport and make the diffusion coefficient position- and absorption-dependent. As a consequence, the true limit of a zero diffusion coefficient is never reached in an absorbing random medium of infinite size, instead, the diffusion coefficient saturates at some finite constant value. Transition to this absorption-limited diffusion exhibits a universality which can be captured within the framework of the self-consistent theory (SCT) of localization. The results of this work (i) justify use of SCT in analyses of experiments in localized regime, provided that absorption is not weak; (ii) open the possibility of diffusive description of wave transport in the saturation regime even when localization effects are strong.
description: 10 pages, 3 figures
title: Dynamic homogenization of composite viscoelastic materials
Creators: name: Del Toro, Rosaria
Publisher: name: IMT Alti Studi Lucca
Year: 2019

description: A non-local dynamic homogenization technique for the analysis
 of a viscoelastic heterogeneous material which displays
 a periodic microstructure is herein proposed. The asymptotic
 expansion of the micro-displacement field in the transformed
 Laplace domain allows obtaining, from the expression
 of the micro-scale field equations, a set of recursive differential
 problems defined over the periodic unit cell. Consequently,
 the cell problems are derived in terms of perturbation
 functions depending on the geometrical and physicalmechanical
 properties of the material and its microstructural
 heterogeneities. A down-scaling relation is formulated in a
 consistent form, which correlates the microscopic to the macroscopic
 transformed displacement field and its gradients through
 the perturbation functions. Average field equations of infinite
 order are determined by substituting the down-scale relation
 into the micro-field equation. Based on a variational
 approach, the macroscopic field equations of a non-local continuum
 is delivered and the local and non-local overall constitutive
 and inertial tensors of the homogenized continuum
 are determined. The problem of wave propagation in case of
 a bi-phase layered material with orthotropic phases and axis
 of orthotropy parallel to the direction of layers is investigated
 as an example. In such a case, the local and non-local overall
 constitutive and inertial tensors are determined analytically
 and the dispersion curves obtained from the non-local
 homogenized model are analysed.
Infrared Behavior of Scalar Condensates in Effective Holographic Theories
Creators: name: Cadoni, Mariano
name: Pani, Paolo
name: Serra, Matteo
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the infrared behavior of the spectrum of scalar-dressed, asymptotically Anti de Sitter (AdS) black brane (BB) solutions of effective holographic models. These solutions describe scalar condensates in the dual field theories. We show that for zero charge density the ground state of these BBs must be degenerate with the AdS vacuum, must satisfy conformal boundary conditions for the scalar field and it is isolated from the continuous part of the spectrum. When a finite charge density is switched on, the ground state is not anymore isolated and the degeneracy is removed. Depending on the coupling functions, the new ground state may possibly be energetically preferred with respect to the extremal Reissner-Nordstrom AdS BB. We derive several properties of BBs near extremality and at finite temperature. As a check and illustration of our results we derive and discuss several analytic and numerical, BB solutions of Einstein-scalar-Maxwell AdS gravity with different coupling functions and different potentials. We also discuss how our results can be used for understanding holographic quantum critical points, in particular their stability and the associated quantum phase transitions leading to superconductivity or hyperscaling violation.
description: 32 pages, 12 figures
Long wave propagation, shoaling and run-up in nearshore areas
Creators: name: Sriram, V.
name: Didenkulova, I.
name: Schimmels, Stefan
name: Sergeeva, A.
name: Goseberg, Nils
Publisher: name: Reston : American Society of Civil Engineers (ASCE)
Year: 2014
Subjects: subject: Elongated solitons
subject: Large-scale experimental facility
subject: Long wave dynamics
subject: Numerical simulation
subject: Propagation
subject: Run-up
subject: Coastal engineering
subject: Computer simulation
subject: Nonlinear equations
subject: Numerical models
subject: Wave propagation
subject: Experimental facilities
subject: Fully nonlinear potential flow
subject: KdV equations
subject: Large wave flumes
subject: Long waves
subject: Nearshores
subject: Nonlinear shallow water
subject: Solitons
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: This paper discusses the possibility to study propagation, shoaling and run-up of these waves over a slope in a 300-meter long large wave flume (GWK), Hannover. For this purpose long bell-shaped solitary waves (elongated solitons) of different amplitude and the same period of 30 s are generated. Experimental data of long wave propagation in the flume are compared with numerical simulations performed within the fully nonlinear potential flow theory and KdV equations. Shoaling and run-up of waves on different mild slopes is studied hypothetically using nonlinear shallow water theory. Conclusions about the feasibility of using large scale experimental facility (GWK) to study tsunami wave propagation and run-up are made.
Labirinto di Barioni
Creators: name: Felici, Maria Rita
Publisher: name: INFN Open Access Repository
Year: 2023
Subjects: boardgame
QCD
Baryons

description: Boardgame to play with quark model of baryons (QCD). Presented at Play 2022 and 2023 and several editions of European Research Nights. Two versions enclosed: beginner and advanced version