cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Optische Schwingungsmessungen: Status, Integration, Pros und Contras
Creators: name: Zschiesche, Kira
name: Rau, Linda
name: Schlüter, Martin
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: Structural Health Monitoring
subject: modulare Kameratachymetrie
subject: Schwingungsmessungen
subject: BIM
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik

description: Am Beispiel einer Eisenbahn-Stahlbrücke erarbeiten wir prototypisch die relevanten Einzelschritte von der mobilen Erfassung kontrollierter Schwingungsdaten bis zur Integration in die Bauwerksdatenmodellierung (BIM). Dieser Aufsatz umfasst einen Abriss bestehender Systeme zur Schwingungsbeobachtung an gealterten Bestandsbauwerken und geht dabei besonders auf die Vor- und Nachteile der optischen Schwingungsmessung ein. Es zeigt sich, dass die optische Schwingungsmessung hierbei eine wirtschaftliche Ergänzung zu bestehenden Systemen darstellt. Näher beschrieben wird das Erfassen von Schwingungen mittels modularer Digitalkameratachymetrie. Präzisionstachymeter können mit Digitalkameras am Okular kombiniert werden. Diese Erweiterung in Verbindung mit der digitalen Bildverarbeitung ermöglicht die automatische Detektion von Zielen und somit auch die berührungslose Erfassung von Schwingungen. Es ist nicht erforderlich das Ziel mit dem Fadenkreuz konkret anzuvisieren. Unzugängliche Objekte, wie z.B. Brückenbauwerke, Fabrikschlote oder Türme für Windenergieanlagen, können ohne Signalisierung durch die modulare Digitalkameratachymetrie hochfrequent durch die Messung natürlicher Ziele diskret, optisch und ad hoc erfasst werden. Es ist kein Eingriff am Objekt notwendig.
Birgit Maul, Frühmittelalterliche Gläser des 5.–7./8. Jahrhunderts n. Chr. Sturzbecher, glockenförmige Becher, Tummler und Glockentummler
Creators: name: Zeller, Gudula
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2023

description: Rezension zu: Birgit Maul, Frühmittelalterliche Gläser des 5.–7./8. Jahrhunderts n. Chr. Sturzbecher, glockenförmige Becher, Tummler und Glockentummler. Universitätsforschungen zur Prähistorischen Archäologie, Band 84. Verlag Dr. Rudolf Habelt GmbH, Bonn 2002. ISBN 3-7749-3088-0 . 2 Bände mit 528 Seiten, 207 Abbildungen und 132 Tafeln
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 83 Nr. 1 (2005)
Power-law Decay and the Ergodic-Nonergodic Transition in Simple Fluids
Creators: name: Spyridis, Paul
name: Mazenko, Gene F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: It is well known that mode coupling theory (MCT) leads to a two step power-law time decay in dense simple fluids. We show that much of the mathematical machinery used in the MCT analysis can be taken over to the analysis of the systematic theory developed in the Fundamental Theory of Statistical Particle Dynamics (arXiv:0905.4904). We show how the power-law exponents can be computed in the second-order approximation where we treat hard-sphere fluids with statics described by the Percus-Yevick solution.
description: 25 pages, 12 figures
title: Beneath the Surface. What Do People Really Do When They Are Ill?
Creators: name: Sax, William S.
Publisher: name: University Library Heidelberg
Year: 2015

description: What is health? What is disease? What does a normal person do when he or she is ill? How does it feel to live in a human body? Many people – and even some scientists – believe that the answers to these questions are obvious, and universal. However the Medical Anthropologists at Heidelberg‘s South Asia Institute scratch beneath the surface to reveal ideas about health and disease that can vary greatly between times and cultures.
description: Ruperto Carola, Nr. 6 (2015): Gesund & Krank, Beginn und Erscheinungsfrequenz: Nummer: 1, Jahr: 2012, Ausgaben pro Band: 2
Supersymmetric hyperbolic Calogero-Sutherland models by gauging
Creators: name: Fedoruk, Sergey
name: Ivanov, Evgeny
name: Lechtenfeld, Olaf
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2019
Subjects: subject: Calogero-Sutherland hyperbolic systems
subject: supersymmetric extension
subject: Wess-Zumino gauge
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Novel N=2 and N=4 supersymmetric extensions of the Calogero-Sutherland hyperbolic systems are obtained by gauging the U(n) isometry of matrix superfield models. The bosonic core of the N=2 models is the standard A n−1 Calogero-Sutherland hyperbolic system, whereas the N=4 model contains additional semi-dynamical spin variables and is an extension of the U(2) spin Calogero-Sutherland hyperbolic system. We construct two different versions of the N=4 model, with and without the interacting center-of-mass coordinate in the bosonic sector.
Studying Paths of Participation in Viral Diffusion Process
Creators: name: Jankowski, Jarosław
name: Ciuberek, Sylwia
name: Zbieg, Anita
name: Michalski, Radosław
Publisher: name: arXiv
Year: 2013
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Authors propose a conceptual model of participation in viral diffusion process composed of four stages: awareness, infection, engagement and action. To verify the model it has been applied and studied in the virtual social chat environment settings. The study investigates the behavioral paths of actions that reflect the stages of participation in the diffusion and presents shortcuts, that lead to the final action, i.e. the attendance in a virtual event. The results show that the participation in each stage of the process increases the probability of reaching the final action. Nevertheless, the majority of users involved in the virtual event did not go through each stage of the process but followed the shortcuts. That suggests that the viral diffusion process is not necessarily a linear sequence of human actions but rather a dynamic system.
description: In proceedings of the 4th International Conference on Social Informatics, SocInfo 2012
Confinement Stabilizes a Bacterial Suspension into a Spiral Vortex
Creators: name: Wioland, Hugo
name: Woodhouse, Francis G.
name: Dunkel, Jörn
name: Kessler, John O.
name: Goldstein, Raymond E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Confining surfaces play crucial roles in dynamics, transport and order in many physical systems, but their effects on active matter, a broad class of dynamically self-organizing systems, are poorly understood. We investigate here the influence of global confinement and surface curvature on collective motion by studying the flow and orientational order within small droplets of a dense bacterial suspension. The competition between radial confinement, self-propulsion, steric interactions and hydrodynamics robustly induces an intriguing steady single-vortex state, in which cells align in inwardly-spiralling patterns accompanied by a thin counterrotating boundary layer. A minimal continuum model is shown to be in good agreement with these observations.
description: 5 pages, 4 figures
Effect of symmetry reduction on the spin dynamics of (001)-oriented GaAs quantum wells
Creators: name: English, D.J.
name: Hübner, Jens
name: Eldridge, P.S.
name: Taylor, D.
name: Henini, M.
name: Harley, R.T.
name: Oestreich, Michael
Publisher: name: College Park, MD : American Physical Society
Year: 2013
Subjects: subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Spin quantum beat spectroscopy is employed to investigate the in-plane anisotropy of the spin dynamics in (001) GaAs/AlGaAs quantum wells induced by an external electric field. This technique allows the anisotropy of the spin relaxation rate Γs and the electron Landé g factor g* to be measured simultaneously. The measurements are compared to similar data from (001) GaAs/AlGaAs quantum wells with applied shear strain and asymmetric barrier growth. All of these operations act to reduce the symmetry compared to that of a symmetric (001) quantum well in an identical manner (D2d → C2v). However, by looking at the anisotropy of both Γs and g* simultaneously we show that the microscopic actions of these symmetry breaking operations are very different. The experiments attest that although symmetry arguments are a very useful tool to identify the allowed spin dependent properties of a material system, only a microscopic approach reveals if allowed anisotropies will manifest. © 2013 American Physical Society.
Robotic Systems in Operating Theaters: New Forms of Team-Machine Interaction in Health Care
Creators: name: Steil, Jochen
name: Finas, Dominique
name: Beck, Susanne
name: Manzeschke, Arnold
name: Haux, Reinhold
Publisher: name: Stuttgart : Georg Thieme Verlag KG
Year: 2019
Subjects: subject: health care
subject: health information systems
subject: hybrid action
subject: operating theater
subject: robots
subject: team-machine interaction
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: Background Health information systems have developed rapidly and considerably during the last decades, taking advantage of many new technologies. Robots used in operating theaters represent an exceptional example of this trend. Yet, the more these systems are designed to act autonomously and intelligently, the more complex and ethical questions arise about serious implications of how future hybrid clinical team-machine interactions ought to be envisioned, in situations where actions and their decision-making are continuously shared between humans and machines. Objectives To discuss the many different viewpoints-from surgery, robotics, medical informatics, law, and ethics-that the challenges of novel team-machine interactions raise, together with potential consequences for health information systems, in particular on how to adequately consider what hybrid actions can be specified, and in which sense these do imply a sharing of autonomous decisions between (teams of) humans and machines, with robotic systems in operating theaters as an example. Results Team-machine interaction and hybrid action of humans and intelligent machines, as is now becoming feasible, will lead to fundamental changes in a wide range of applications, not only in the context of robotic systems in surgical operating theaters. Collaboration of surgical teams in operating theaters as well as the roles, competencies, and responsibilities of humans (health care professionals) and machines (robotic systems) need to be reconsidered. Hospital information systems will in future not only have humans as users, but also provide the ground for actions of intelligent machines. Conclusions The expected significant changes in the relationship of humans and machines can only be appropriately analyzed and considered by inter- and multidisciplinary collaboration. Fundamentally new approaches are needed to construct the reasonable concepts surrounding hybrid action that will take into account the ascription of responsibility to the radically different types of human versus nonhuman intelligent agents involved.
Room temperature entanglement between distant single spins in diamond
Creators: name: Dolde, Florian
name: Jakobi, Ingmar
name: Naydenov, Boris
name: Zhao, Nan
name: Pezzagna, Sebastien
name: Trautmann, Christina
name: Meijer, Jan
name: Neumann, Philipp
name: Jelezko, Fedor
name: Wrachtrup, Jörg
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Entanglement is the central yet fleeting phenomena of quantum physics. Once being considered a peculiar counter-intuitive property of quantum theory it has developed into the most central element of quantum technology providing speed up to quantum computers, a path towards long distance quantum cryptography and increased sensitivity in quantum metrology. Consequently, there have been a number of experimental demonstration of entanglement between photons, atoms, ions as well as solid state systems like spins or quantum dots, superconducting circuits and macroscopic diamond. Here we experimentally demonstrate entanglement between two engineered single solid state spin quantum bits (qubits) at ambient conditions. Photon emission of defect pairs reveals ground state spin correlation. Entanglement (fidelity = 0.67 \pm 0.04) is proven by quantum state tomography. Moreover, the lifetime of electron spin entanglement is extended to ms by entanglement swapping to nuclear spins, demonstrating nuclear spin entanglement over a length scale of 25 nm. The experiments mark an important step towards a scalable room temperature quantum device being of potential use in quantum information processing as well as metrology.
On the electronic structure of silicene on Ag substrate: strong hybridization effects
Creators: name: Cahangirov, Seymur
name: Audiffred, Martha
name: Tang, Peizhe
name: Iacomino, Amilcare
name: Duan, Wenhui
name: Merino, Gabriel
name: Rubio, Angel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The electronic structure of the recently synthesised (3x3) reconstructed silicene on (4x4) Ag(111) is investigated by first-principles calculations. New states emerge due to the strong hybridization between silicene and Ag. Analyzing the nature and composition of these hybridized states, we show that i) it is possible to clearly distinguish them from states coming from the Dirac cone of free-standing silicene or from the sp-bands of bulk Ag and ii) assign their contribution to the description of the linearly dispersing band observed in photoemission. Furthermore, we show that silicene atoms contribute to the Fermi level, which leads to similar STM patterns as observed below or above the Fermi level. Our findings are crucial for the proper interpretation of experimental observations.
description: 8 pages, 3 figures including supplementary material
Detailed HBT measurements with respect to the event plane and collision energy in Au+Au collisions at PHENIX
Creators: name: Niida, Takafumi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The azimuthal dependence of 3D HBT radii relative to the event plane gives us information about the source shape at freeze-out. It also provides information on the system's evolution by comparing it to the initial source shape. In recent studies, higher harmonic event planes and flow have been measured at RHIC and the LHC, which result primarily from spatial fluctuations of the initial density across the collision area. If the shape caused by initial fluctuations still exists at freeze-out, the HBT measurement relative to higher order event plane may show these features. We present recent results of azimuthal HBT measurements relative to $2^{nd}$- and $3^{rd}$-order event planes in Au+Au 200 GeV collisions with the PHENIX experiment. Recent HBT measurements at lower energies will be also shown and compared with the 200 GeV result.
description: 4 pages, 4 figures, proceedings of Quark Matter 2012 at Washington D.C., USA
Photoexcitation of PbS nanosheets leads to highly mobile charge carriers and stable excitons
Creators: name: Lauth, Jannika
name: Failla, Michele
name: Klein, Eugen
name: Klinke, Christian
name: Kinge, Sachin
name: Siebbeles, Laurens D.A.
Publisher: name: Cambridge : Royal Society of Chemistry
Year: 2019
Subjects: subject: Charge carriers
subject: Energy gap
subject: Excitons
subject: IV-VI semiconductors
subject: Lead compounds
subject: Nanosheets
subject: Narrow band gap semiconductors
subject: Optical pumping
subject: Sols
subject: Surface defects
subject: Terahertz spectroscopy
subject: Different thickness
subject: Free charge carriers
subject: Frequency dependent
subject: Mobile charge carriers
subject: Optical-pump terahertz-probe spectroscopy
subject: Optoelectronic applications
subject: Solution processable
subject: Two Dimensional (2 D)
subject: Sulfur compounds
subject: Dewey Decimal Classification::600 | Technik

description: Solution-processable two-dimensional (2D) semiconductors with chemically tunable thickness and associated tunable band gaps are highly promising materials for ultrathin optoelectronics. Here, the properties of free charge carriers and excitons in 2D PbS nanosheets of different thickness are investigated by means of optical pump-terahertz probe spectroscopy. By analyzing the frequency-dependent THz response, a large quantum yield of excitons is found. The scattering time of free charge carriers increases with nanosheet thickness, which is ascribed to reduced effects of surface defects and ligands in thicker nanosheets. The data discussed provide values for the DC mobility in the range 550-1000 cm2 V-1 s-1 for PbS nanosheets with thicknesses ranging from 4 to 16 nm. Results underpin the suitability of colloidal 2D PbS nanosheets for optoelectronic applications.
NMR Studies of Lithium Diffusion in Li3(NH2)2I over Wide Range of Li+ Jump Rates
Creators: name: Skripov, Alexander V.
name: Volgmann, Kai
name: Chandran, C. Vinod
name: Skoryunov, Roman V.
name: Babanova, Olga A.
name: Soloninin, Alexei V.
name: Orimo, Shin-Ichi
name: Heitjans, Paul
Publisher: name: Berlin : Walter de Gruyter
Year: 2017
Subjects: subject: complex hydride
subject: ion diffusion
subject: nuclear magnetic resonance
subject: spin-alignment echo
subject: spin-lattice relaxation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We have studied the Li diffusion in the complex hydride Li3(NH2)2I which appears to exhibit fast Li ion conduction. To get a detailed insight into the Li motion, we have applied 7Li nuclear magnetic resonance spectroscopy methods, such as spin-lattice relaxation in the laboratory and rotating frames of reference, as well as spin-alignment echo. This combined approach allows us to probe Li jump rates over the wide dynamic range (~102–109 s−1). The spin-lattice relaxation data in the range 210–410 K can be interpreted in terms of a thermally-activated Li jump process with a certain distribution of activation energies. However, the low-temperature spin-alignment echo decays at T≤200 K suggest the presence of another Li jump process with the very low effective activation energy. © 2017 Walter de Gruyter GmbH, Berlin/Boston 2017.
Astrophysics of magnetically collimated jets generated from laser-produced plasmas
Creators: name: Ciardi, A.
name: Vinci, T.
name: Fuchs, J.
name: Albertazzi, B.
name: Riconda, C.
name: Pépin, H.
name: Portugall, O.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The generation of astrophysically relevant jets, from magnetically collimated, laser-produced plasmas, is investigated through three-dimensional, magneto-hydrodynamic simulations. We show that for laser intensities I ~ 10^12 - 10^14 W/cm^2, a magnetic field in excess of ~ 0.1 MG, can collimate the plasma plume into a prolate cavity bounded by a shock envelope with a standing conical shock at its tip, which re-collimates the flow into a super magneto-sonic jet beam. This mechanism is equivalent to astrophysical models of hydrodynamic inertial collimation, where an isotropic wind is focused into a jet by a confining circumstellar torus-like envelope. The results suggest an alternative mechanism for a large-scale magnetic field to produce jets from wide-angle winds. (abridged version)
description: Accepted for publication in Physical Review Letters. 5 pages, 4 figures
Lattice Vibrations to Identify the Li/Na Ratio in LixNa2−xTi6O13 (x = 0…2)
Creators: name: Volgmann, Kai
name: Schulz, Alexander
name: Welsch, Anna-Maria
name: Bredow, Thomas
name: Nakhal, Suliman
name: Lerch, Martin
name: Heitjans, Paul
Publisher: name: Berlin : Walter de Gruyter
Year: 2015
Subjects: subject: In situ X-ray Diffraction
subject: Li2Ti6O13
subject: Mixed Cation Conductor
subject: Na2Ti6O13
subject: Raman Spectroscopy
subject: X-ray Diffraction Analysis
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: LixNa2−xTi6O13has received attention as 3d-metal oxide based anode material for possible battery application. Generally, titanium oxides represent excellent Li hosts due to their zero-strain behavior, cycling stability and high operating voltage. New developments choose Na as charge carrier, but less effort is put in the investigation of mixed cation conductors. Owing to the synthesis route of LixNa2−xTi6O13(0 ≤ x ≤ 2) the coordination of Na and Li in the channels is different which had been investigated by means of X-ray and neutron diffraction. Up to now, no Raman spectroscopy has been applied. This oxide is highly Raman-active, thus the local structure can also be analyzed in terms of vibrational spectroscopy. Micro-Raman spectroscopy carried out at room temperature with different cation contents (x = 0, 0.33, 1, 2) shows the continuous change from Na to Li by a superposition of the modes for Na2Ti6O13 and Li2Ti6O13. The only exceptions are two distinct modes. They appear either for Li (118 cm–1) or Na (135 cm–1). The results confirm the high-temperature phase stability of Na2Ti6O13 as well as the anisotropic thermal expansion of the unit cell seen by in situ X-ray powder diffraction under two different gas atmospheres. Combining these results, we suppose that the anisotropic thermal expansion of the lattice parameters is affected by the normal vectors of the corresponding bond vibrations in Na2Ti6O13 and Li2Ti6O13. Crystalline-orbital calculations of the Raman shifts of LixNa2−xTi6O13were carried out for the cation contents x = 0, 1, 2 and Raman modes were assigned to specific bond vibrations supported by theory. Besides, this gives additionally information about the Li/Na ratio in a new and simple way. © 2015 Walter de Gruyter.
Fluid transport by active elastic membranes
Creators: name: Evans, Arthur A.
name: Lauga, Eric
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A flexible membrane deforming its shape in time can self-propel in a viscous fluid. Alternatively, if the membrane is anchored, its deformation will lead to fluid transport. Past work in this area focused on situations where the deformation kinematics of the membrane were prescribed. Here we consider models where the deformation of the membrane is not prescribed, but instead the membrane is internally forced. Both the time-varying membrane shape, and the resulting fluid motion, result then from a balance between prescribed internal active stresses, internal passive resistance, and external viscous stresses. We introduce two specific models for such active internal forcing: one where a distribution of active bending moments is prescribed, and one where active inclusions exert normal stresses on the membrane by pumping fluid through it. In each case, we asymptotically calculate the membrane shape and the fluid transport velocities for small forcing amplitudes, and recover our results using scaling analysis.
Modular aufgebaute Vorformwerkzeuge für das Schmieden von Langteilen
Creators: name: Hustedt, Peter
Publisher: name: Hannover : Universität
Year: 2003
Subjects: subject: Preforming
subject: drop forging
subject: precision forging
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: [no abstract]
Thermopower in the quantum Hall regime
Creators: name: d'Ambrumenil, N.
name: Morf, R. H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider the effect of disorder on the themopower in quantum Hall systems. For a sample in the Corbino geometry, where dissipative currents are not carried by edge states, we find that thermopower behaves at high temperatures like a system with a gap and has a maximum which increases as the temperature is reduced. At lower temperatures this maximum reduces as a function of temperature as a result of tunneling across saddle points in the background potential. Our model assumes that the mean saddle point height varies linearly with the deviation in filling factor from the quantized value. We test this hypothesis against observations for the dissipative electrical conductance as a function of temperature and field and find good agreement with experiment around the minimum.
description: 5 pages, 4 figures
Editorial
Creators: name: Eitel, Bernhard
Publisher: name: Ruperto Carola
Year: 2015

description: LIEBE LESERINNEN UND
LESER DER RUPERTO CAROLA,
im internationalen Jahr des Lichts widmen wir die Dezember-Ausgabe unseres Forschungsmagazins dem Schwerpunktthema SCHATTEN & LICHT. Als Ursprung jeglichen Lebens und Quelle der Erkenntnis ebenso wie als Motor für Technik und Innovation beeinflusst Licht tief greifend alle Bereiche unserer Existenz und damit auch der Wissenschaft. Kein Hell ohne Dunkel: Das zeigen Überlegungen zu den Licht- und Schattenseiten des deutschen Wissenschaftssystems ebenso wie die Beiträge unserer Autoren zu lebensfeindlichen Ökosystemen, in die kein Sonnenstrahl vorzudringen vermag, oder zu den schädigenden Auswirkungen des Sonnenlichts.
description: Ruperto Carola, Nr. 7 (2015): Schatten & Licht
Atomic-scale measurement of ultraslow Li motions in glassy LiAlSi2 O6 by two-time L6 i spin-alignment echo NMR correlation spectroscopy
Creators: name: Wilkening, Martin
name: Kuhn, Alexander
name: Heitjans, Paul
Publisher: name: College Park, ML : American Physical Society
Year: 2008
Subjects: subject: Spin-Alignment Echo (SAE)
subject: Nuclear Magnetic Resonance (NMR)
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: 6Li spin-alignment echo (SAE) nuclear-magnetic-resonance (NMR) spectroscopy is used to monitor single-particle two-time correlation functions in LiAlSi2O6 glass. The method, here applied in the temperature range from 300 to 400 K, is sensitive to ultraslow Li hopping processes with rates (1/τSAE) down to 10 jumps/s. The use of a sample with natural 6Li abundance allowed the measurement of pure NMR spin-alignment echoes which are damped with increasing mixing time exclusively by slow Li jumps, i.e., free of influences arising from, e.g., interfering spin-diffusion effects. The considerably stretched correlation functions reveal the presence of a broad distribution of jump rates. The results are comprehensively compared with those recently obtained from both 7Li SAE and 7Li spin-lattice relaxation NMR as well as from dc conductivity measurements. Interestingly, the activation energy of the latter, which are sensitive to long-range Li transport parameters, is in good agreement with that microscopically probed by 6Li SAE NMR, here. © 2008 The American Physical Society.
Ein zirkular polarisierter Breitbandstrahler für den Einsatz in planaren Gruppenantennen
Creators: name: Büchel, Oliver
Publisher: name: Hannover : Universität
Year: 2003
Subjects: subject: Circular polarization
subject: sprial antennas
subject: mutual coupling
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
Kinematisches Laserscanning zur statischen Bewertung großer Brückenbauwerke
Creators: name: Hesse, Christian
name: Krause, Niklas
name: Frenz, Matthias
name: Neumann, Ingo
name: Hake, Frederic
name: Paffenholz, Jens-André
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: Brücke
subject: Bauwerksprüfung
subject: Tragwerk
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik

description: Die Norderelbbrücke aus dem Baujahr 1963 überführt als östliche Hamburger Elbquerung die Bundesautobahn 1 über die namensgebende Norderelbe und liegt direkt zwischen den beiden Autobahndreiecken Hamburg-Süd und Hamburg-Südost. Für den Schwerverkehr liegt die Brücke sowohl auf einer Zufahrtsroute des Hamburger Hafens als auch für den Skandinavien Verkehr über die Fährhäfen und Brücken der Ostsee und ist somit von herausragender Bedeutung für den Fernverkehr. Nachdem in den 2010er Jahren erste Schäden in Form von Ermüdungsrissen aufgetreten sind, wurden Nachrechnungen und Bauwerksprüfungen durchgeführt. In diesem Zuge wurde festgestellt, dass eine der Realität möglichst genau entsprechende rechnerische Tragwerksmodellierung von hoher Wichtigkeit ist, um die aufgetretenen Schäden bewerten und kritische Punkte im Tragwerk sicher bestimmen zu können. Hierfür bietet ein Vergleich zwischen Messung und Rechnung der Tragwerksverformungen unter definierten Lasten eine gute Möglichkeit für eine Verifikation und Kalibrierung von Rechenmodellen. Im vorliegenden Fall konnten die Überfahrten von außergewöhnlichen Schwertransporten mit definierten Lasten genutzt werden. Für die messtechnische Erfassung der Tragwerksverformungen kam ein innovatives kinematisches Laserscanning zum Einsatz. Das prinzipielle Vorgehen zur Messdatenerfassung und die Ergebnisse des Vergleichs werden im vorliegenden Artikel beschrieben.
Ecology and behavior of reintroduced Hawaiian geese
Creators: name: Woog, Friederike
Publisher: name: Hannover : Universität Hannover
Year: 1999
Subjects: subject: Hawaiian goose
subject: behavioral ecology
subject: habitat management
subject: Hawaii Volcanoes National Park
subject: Hawaiigans
subject: Tierökologie
subject: Verhalten
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Immiscible hydrous Fe-Ca-P melt and the origin of iron oxide-apatite ore deposits
Creators: name: Hou, Tong
name: Charlier, Bernard
name: Holtz, Francois
name: Veksler, Ilya
name: Zhang, Zhaochong
name: Thomas, Rainer
name: Namur, Olivier
Publisher: name: London : Springer Nature
Year: 2018
Subjects: subject: apatite
subject: calcium
subject: fluorine
subject: iron
subject: iron oxide
subject: oxygen
subject: phosphorus
subject: silicon
subject: water
subject: chemical composition
subject: economic geology
subject: fugacity
subject: immiscibility
subject: ore deposit
subject: oxidation
subject: separation
subject: silicate
subject: temperature effect
subject: Article
subject: conjugate
subject: liquid
subject: Dewey Decimal Classification::500 | Naturwissenschaften
subject: Dewey Decimal Classification::500 | Naturwissenschaften::551 | Geologie, Hydrologie, Meteorologie

description: The origin of iron oxide-apatite deposits is controversial. Silicate liquid immiscibility and separation of an iron-rich melt has been invoked, but Fe-Ca-P-rich and Si-poor melts similar in composition to the ore have never been observed in natural or synthetic magmatic systems. Here we report experiments on intermediate magmas that develop liquid immiscibility at 100 MPa, 1000-1040°C, and oxygen fugacity conditions (fO2) of ΔFMQ = 0.5-3.3 (FMQ = fayalite-magnetite-quartz equilibrium). Some of the immiscible melts are highly enriched in iron and phosphorous ± calcium, and strongly depleted in silicon (<5 wt.% SiO2). These Si-poor melts are in equilibrium with a rhyolitic conjugate and are produced under oxidized conditions (∼FMQ + 3.3), high water activity (aH2O ≥ 0.7), and in fluorine-bearing systems (1 wt.%). Our results show that increasing aH2O and fO2 enlarges the two-liquid field thus allowing the Fe-Ca-P melt to separate easily from host silicic magma and produce iron oxide-apatite ores.
Evaluation and prediction of high-rise building settlements based on satellite data
Creators: name: Hoefsloot, F.J.M.
name: Wiersema, R.W.
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: Netherlands
subject: High-rise buildings
subject: InSAR
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik

description: High-rise buildings in the western part of The Netherlands are subject to settlement as a result of compression of deep-lying cohesive layers. The size of the compression and creep deformation depends on the load increment in the compressible layers which is determined by building dimensions, permanent load and foundation level. In addition, the properties of the compressible layers are important. A great uncertainty herein is the pre-consolidation stress or initial creep rate of these layers. On the basis of InSAR - satellite data of existing high-rise buildings, the current settlement rate can be measured and a good estimate is possible of, in particular, the pre-consolidation stress in the compressible layers resulting in the observed settlement rate.
Interplay of Electron and Nuclear Spin Noise in n -Type GaAs
Creators: name: Berski, Fabian
name: Hübner, Jens
name: Oestreich, Michael
name: Ludwig, Arne
name: Wieck, A.D.
name: Glazov, Mikhail
Publisher: name: College Park, MD : American Physical Society
Year: 2015
Subjects: subject: Electrons
subject: Electrospinning
subject: Gallium arsenide
subject: Magnetic fields
subject: Magnetic moments
subject: Semiconducting gallium
subject: Spin fluctuations
subject: Donor-bound exciton
subject: Electron spin precession
subject: External magnetic field
subject: Low magnetic fields
subject: Orders of magnitude
subject: Semiconductor systems
subject: Spin noise spectroscopy
subject: Very low frequency
subject: Spin dynamics
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We present spin-noise spectroscopy measurements on an ensemble of donor-bound electrons in ultrapure GaAs:Si covering temporal dynamics over 6 orders of magnitude from milliseconds to nanoseconds. The spin-noise spectra detected at the donor-bound exciton transition show the multifaceted dynamical regime of the ubiquitous mutual electron and nuclear spin interaction typical for III-V-based semiconductor systems. The experiment distinctly reveals the finite Overhauser shift of an electron spin precession at zero external magnetic field and a second contribution around zero frequency stemming from the electron spin components parallel to the nuclear spin fluctuations. Moreover, at very low frequencies, features related with time-dependent nuclear spin fluctuations are clearly resolved making it possible to study the intricate nuclear spin dynamics at zero and low magnetic fields. The findings are in agreement with the developed model of electron and nuclear spin noise. © 2015 American Physical Society.
Einsatz ultrakurzer Laserpulse in der refraktiven Laserchirugie
Creators: name: Heisterkamp, Alexander
Publisher: name: Hannover : Universität
Year: 2002
Subjects: subject: Ultrashort laser pulses
subject: photodisruption
subject: fs-LASIK
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: [no abstract]
Populus alba
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: P. alba X tremula (= P. canescens [Alton] Sm.) Cat. 331 l: LesCombasses bei Salvan, 1050m (Coquoz 1921). - 2: Im Gebiet Branson-Fully vielfach, bis 800m (Garns); Beudon (idem); Chäteauneuf bei Sitten (Guyot, Garns); Valenson (Coquoz); Siders (Exk. Soc.Bot. Geneve 1915). - 3:Econe (J.); Nendaz (J.).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Negative Effects of Incentivised Viral Campaigns for Activity in Social Networks
Creators: name: Michalski, Radosław
name: Jankowski, Jarosław
name: Kazienko, Przemysław
Publisher: name: arXiv
Year: 2013
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Viral campaigns are crucial methods for word-of-mouth marketing in social communities. The goal of these campaigns is to encourage people for activity. The problem of incentivised and non-incentivised campaigns is studied in the paper. Based on the data collected within the real social networking site both approaches were compared. The experimental results revealed that a highly motivated campaign not necessarily provides better results due to overlapping effect. Additional studies have shown that the behaviour of individual community members in the campaign based on their service profile can be predicted but the classification accuracy may be limited.
description: In proceedings of the 2nd International Conference on Social Computing and its Applications, SCA 2012
Modellierung der Deformation eines Stahlträgers durch indirekte Dehnungsmessungen
Creators: name: Barnefske, Eike
name: Ohlendieck, Jens
name: Sternberg, Harald
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: Stahlträger
subject: Stabilität
subject: Durchbiegung
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik

description: Die Durchbiegung von Stahlträgern ist bei der Überwachung von Bauwerken von besonderem Interesse, um Aussagen zur Stabilität dieser machen zu können. In vielen Fällen ist ein direktes Messen der Durchbiegung nicht möglich, so dass diese über andere Messgrößen bestimmt werden muss und eine Beziehung zwischen verschiedenen Größen zu modellieren ist. Längsdehnungen und Durchbiegungen stehen vereinfacht ausgedrückt für den Fall der mittleren Durchbiegung bei Stahlträgern in einer linearen Beziehung. Werden für die Sensoren aber auf Adaptern am Träger installiert, dann muss der Einfluss dieser im Dehnungs-Durchbiegungs-Modell berücksichtigt werden. Die empirische Bestimmung des Einflusses und die Erstellung eines einfachen Kongruenzmodells für diesen Fall liegen im Fokus dieser Untersuchungen.
title: Determination and Measurement of Melanopic Equivalent Daylight (D65) Illuminance (mEDI) in the Context of Smart and Integrative Lighting
Creators: name: Trinh, Vinh Quang
name: Bodrogi, Peter
name: Khanh, Tran Quoc
Publisher: name: MDPI
Year: 2023

description: In the context of intelligent and integrative lighting, in addition to the need for color quality and brightness, the non-visual effect is essential. This refers to the retinal ganglion cells (ipRGCs) and their function, which were first proposed in 1927. The melanopsin action spectrum has been published in CIE S 026/E: 2018 with the corresponding melanopic equivalent daylight (D65) illuminance (mEDI), melanopic daylight (D65) efficacy ratio (mDER), and four other parameters. Due to the importance of mEDI and mDER, this work synthesizes a simple computational model of mDER as the main research objective, based on a database of 4214 practical spectral power distributions (SPDs) of daylight, conventional, LED, and mixed light sources. In addition to the high correlation coefficient R² of 0.96795 and the 97% confidence offset of 0.0067802, the feasibility of the mDER model in intelligent and integrated lighting applications has been extensively tested and validated. The uncertainty between the mEDI calculated directly from the spectra and that obtained by processing the RGB sensor and applying the mDER model reached ± 3.3% after matrix transformation and illuminance processing combined with the successful mDER calculation model. This result opens the potential for low-cost RGB sensors for applications in intelligent and integrative lighting systems to optimize and compensate for the non-visual effective parameter mEDI using daylight and artificial light in indoor spaces. The goal of the research on RGB sensors and the corresponding processing method are also presented and their feasibility is methodically demonstrated. A comprehensive investigation with a huge amount of color sensor sensitivities is necessary in a future work of other research.
Identifying candidate datasets for data interlinking
Creators: name: Leme, Luiz André P. Paes
name: Lopes, Giseli Rabello
name: Pereira Nunes, Bernardo
name: Casanova, Marco Antonio
name: Dietze, Stefan
Publisher: name: Heidelberg : Springer Verlag
Year: 2013
Subjects: subject: Bayesian classifier
subject: data interlinking
subject: Linked Data
subject: Computational effort
subject: datasets recommendation
subject: Design Principles
subject: Linked datum
subject: Probabilistic classifiers
subject: Search spaces
subject: Artificial intelligence
subject: Computer science
subject: Konferenzschrift
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: One of the design principles that can stimulate the growth and increase the usefulness of the Web of data is URIs linkage. However, the related URIs are typically in different datasets managed by different publishers. Hence, the designer of a new dataset must be aware of the existing datasets and inspect their content to define sameAs links. This paper proposes a technique based on probabilistic classifiers that, given a datasets S to be published and a set T of known published datasets, ranks each Ti ∈ T according to the probability that links between S and Ti can be found by inspecting the most relevant datasets. Results from our technique show that the search space can be reduced up to 85%, thereby greatly decreasing the computational effort. The final publication is available at Springer via http://dx.doi.org/10.1007/978-3-642-39200-9_29.
title: Elisabeth Ettlinger/Katrin Roth-Rubi: Helvetische Reliefsigillaten und die Rolle der Werkstatt Bern-Enge. Acta Bernensia Band 8. Bern 1979
Creators: name: Oldenstein-Pferdehirt, Barbara
Publisher: name: University Library Heidelberg
Year: 2015

description: Rezension zu: Elisabeth Ettlinger/Katrin Roth-Rubi: Helvetische Reliefsigillaten und die Rolle der Werkstatt Bern-Enge. Acta Bernensia Band 8. Verlag Stämpfli und Cie. AG, Bern 1979. 136 Seiten, Textabbildungen, Tabellen, 36 Tafeln, 1 Karte und 1 farbiges Frontispiz.
Reconstructing cosmological initial conditions from galaxy peculiar velocities. I. Reverse Zeldovich Approximation
Creators: name: Doumler, Timur
name: Hoffman, Yehuda
name: Courtois, Helene
name: Gottloeber, Stefan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We propose a new method to recover the cosmological initial conditions of the presently observed galaxy distribution, which can serve to run constrained simulations of the Local Universe. Our method, the Reverse Zeldovich Approximation (RZA), can be applied to radial galaxy peculiar velocity data and extends the previously used Constrained Realizations (CR) method by adding a Lagrangian reconstruction step. The RZA method consists of applying the Zeldovich approximation in reverse to galaxy peculiar velocities to estimate the cosmic displacement field and the initial linear matter distribution from which the present-day Local Universe evolved.We test our method with a mock survey taken from a cosmological simulation. We show that the halo peculiar velocities at z = 0 are close to the linear prediction of the Zeldovich approximation, if a grouping is applied to the data to remove virial motions. We find that the addition of RZA to the CR method significantly improves the reconstruction of the initial conditions. The RZA is able to recover the correct initial positions of the velocity tracers with a median error of only 1.36 Mpc/h in our test simulation. For realistic sparse and noisy data, this median increases to 5 Mpc/h. This is a significant improvement over the previous approach of neglecting the displacement field, which introduces errors on a scale of 10 Mpc/h or even higher. Applying the RZA method to the upcoming high-quality observational peculiar velocity catalogues will generate much more precise constrained simulations of the Local Universe.
description: Accepted for MNRAS 2012 December 12
Ising models and topological codes: classical algorithms and quantum simulation
Creators: name: Nest, M. Van den
name: Dür, W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present an algorithm to approximate partition functions of 3-body classical Ising models on two-dimensional lattices of arbitrary genus, in the real-temperature regime. Even though our algorithm is purely classical, it is designed by exploiting a connection to topological quantum systems, namely the color codes. The algorithm performance is exponentially better than other approaches which employ mappings between partition functions and quantum state overlaps. In addition, our approach gives rise to a protocol for quantum simulation of such Ising models by simply measuring local observables on color codes.
description: 5 pages + supplementary material
Surface Based Modelling of Ground Motion Areas in Lower Saxony
Creators: name: Mohammadivojdan, Bahareh
name: Alkhatib, Hamza
name: Brockmeyer, Marco
name: Jahn, Cord-Hinrich
name: Neumann, Ingo
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: Ground motion in Lower Saxony
subject: Multilevel B-Splines
subject: Kriging
subject: Surface Approximation
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik

description: Systematic investigations have shown subsidence in almost 30% of the land area in Lower Saxony. It is essential to model these variations of the Earth surface especially to update the spatial reference system. Since the geodetic observations result in discrete points, it is necessary to mathematically model these measurements to have a continues surface. This enables the user to do predictions at any position. This is challenging especially because these types of measurements usually result in non-uniformly distributed data. There are different approaches to deal with this problem, here the stochastic method of Kriging and the deterministic method of Multilevel B-Splines are implemented to model ground motion. This paper investigates the ground motion of specific areas in Lower Saxony through the cooperation of Landesamt für Geoinformation und Landesvermessung Niedersachsen (LGLN) and Geodetic Institute of Hannover. For this investigation, a time series of measurements from leveling, Global Navigation Satellite System (GNSS) observations and height changes that are acquired by Persistent Scatterer Interferometry (PSI) technique are taken into consideration. Evaluation of the results show not only good performance and promising results from both the approaches, but also compatibility between the approximated surface from both of them.