cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The catalogue of positions of optically bright extragalactic radio sources OBRS-2
Creators: name: Petrov, Leonid
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: It is anticipated that future space-born missions, such as Gaia, will be able to determine in optical domain positions of more than 100,000 bright quasars with sub-mas accuracies that are comparable to very long baseline interferometry (VLBI) accuracies. Comparisons of coordinate systems from space-born missions and from VLBI will be very important, first for investigation of possible systematic errors, second for investigation of possible shift between centroids of radio and optical emissions in active galaxy nuclea. In order to make such a comparison more robust, a program of densification of the grid of radio sources detectable with both VLBI and Gaia was launched in 2006. In the second observing campaign a set of 290 objects from the list of 398 compact extragalactic radio sources with declinations greater -10 deg was observed with the VLBA+EVN in 2010-2011 with the primary goal of producing their images with milliarcsecond resolution. These sources are brighter than 18 magnitude at V band. In this paper coordinates of observed sources have been derived with milliarcsecond accuracies from analysis of these VLBI observations following the method of absolute astrometry and their images were produced. The catalogue of positions of 295 target sources and estimates of their correlated flux densities at 2.2 and 8.4 GHz is presented. The accuracies of source coordinates are in a range of 2 to 200 mas, with the median 3.2 mas.
description: 7 pages, 6 figures, one machine readable table. The manuscript is submitted to the Astronomical Journal. The machine readable table can be found in the source tar-ball of this submission. arXiv admin note: text overlap with arXiv:1103.2840
Impulsive Thermal X-ray Emission from a Low-lying Coronal Loop
Creators: name: Liu, Siming
name: Li, Youping
name: Fletcher, Lyndsay
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Understanding the relationship among different emission components plays an essential role in the study of particle acceleration and energy conversion in solar flares. In flares where gradual and impulsive emission components can be readily identified the impulsive emission has been attributed to non-thermal particles. We carry out detailed analysis of Hα and X-ray observations of a GOES class B microflare loop on the solar disk. The impulsive hard X-ray emission, however, is found to be consistent with a hot, quasi-thermal origin, and there is little evidence of emission from chromospheric footpoints, which challenges conventional models of flares and reveals a class of microflares associated with dense loops. Hα observations indicate that the loop lies very low in the solar corona or even in the chromosphere and both emission and absorption materials evolve during the flare. The enhanced Hα emission may very well originate from the photosphere when the low-lying flare loop heats up the underlying chromosphere and reduces the corresponding Hα opacity. These observations may be compared with detailed modeling of flare loops with the internal kink instability, where the mode remains confined in space without apparent change in the global field shape, to uncover the underlying physical processes and to probe the structure of solar atmosphere.
description: 10 figures, to appear on ApJ
LISA optical bench development : experimental investigation of tilt-to-length coupling for a spaceborne gravitational wave detector
Creators: name: Lieser, Maike Danielle
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: LISA
subject: gravitational wave detector in space
subject: tilt-to-length coupling
subject: imaging systems
subject: Gravitationswellendetektor im Weltraum
subject: Kopplung von Strahlverkippung in Weglängensignal
subject: Abbildungssysteme
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Elektronischer Transport in spinpolarisierten Oberflächen
Creators: name: Kröger, Philipp Constantin
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Spintronics
subject: ultra thin Bismuth films
subject: Magnetotransport
subject: Spintronik
subject: ultra-dünne Bismuthfilme
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
One and two-color photoassociation spectroscopy of ultracold 40Ca
Creators: name: Pachomow, Evgenij
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Ultracold calcium atoms and molecules
subject: one and two-color photoassociation spectroscopy
subject: molecular ground-state potential
subject: optical Feshbach resonances
subject: scattering length
subject: Ultrakalte Calcium-Atome und Calcium-Moleküle
subject: Ein- und Zwei-Farben-Photoassoziationsspektroskopie
subject: molekulares Grundzustand-Potenzial
subject: optische Feshbach-Resonanzen
subject: Streulänge
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Deutsche Soldatenfriedhöfe des Ersten Weltkrieges und der Weimarer Republik : ein Beitrag zur Professionsgeschichte der Landschaftsarchitektur
Creators: name: Rietz, Simon
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Cemetery art
subject: military cemetery
subject: sepulchral culture
subject: fallen soldiers
subject: Friedhofskunst
subject: Soldatenfriedhof
subject: Sepulkralkultur
subject: gefallene Soldaten
subject: Dewey Decimal Classification::700 | Künste, Bildende Kunst allgemein::710 | Landschaftsgestaltung, Raumplanung

description: [no abstract]
Vaccinium uliginosum L. Cat.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: G. uliginosum L. Cat. 179. l: Salvan (Coquoz). - 2: Branson-Fully (Mayor, Oberson). - 3: Valsorey (Guyot); Euseigne (Chenevard); Pfyn (Oberson). - 4: GegenüberMünster(Henchoz).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Single top quark measurements with CMS
Creators: name: Wagner-Kuhr, Jeannine
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Measurements of single top quark production are presented, performed using CMS data collected in 2011 and 2012 at centre-of-mass energies of 7 and 8 TeV. The cross sections for the electroweak production of single top quarks in the t-channel and in association with W-bosons is measured and the results are used to place constraints on the CKM matrix element |V_tb|.
description: 5 pages, 6 figures, conference HCP2012
Theoretical study of lithium clusters by electronic stress tensor
Creators: name: Ichikawa, Kazuhide
name: Nozaki, Hiroo
name: Komazawa, Naoya
name: Tachibana, Akitomo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We study the electronic structure of small lithium clusters Li_n (n=2-8) using the electronic stress tensor. We find that the three eigenvalues of the electronic stress tensor of the Li clusters are negative and degenerate, just like the stress tensor of liquid. This leads us to propose that we may characterize a metallic bond in terms of the electronic stress tensor. Our proposal is that in addition to the negativity of the three eigenvalues of the electronic stress tensor, their degeneracy characterizes some aspects of the metallic nature of chemical bonding. To quantify the degree of degeneracy, we use the differential eigenvalues of the electronic stress tensor. By comparing the Li clusters and hydrocarbon molecules, we show that the sign of the largest eigenvalue and the differential eigenvalues could be useful indices to evaluate the metallicity or covalency of a chemical bond.
description: 28 pages, 9 figures
Steuerung der Reifeprozesse von Musa x paradisiaca (Dessertbananen) auf der Basis von Luft-Ionisation
Creators: name: Weber, Johanna Katharina
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Ethene degradation
subject: air-ionisation
subject: Musa x paradisiaca
subject: Ethenabbau
subject: Luft-Ionisation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Lamb-Dicke spectroscopy of the 1S0 → 3P0 transition in 24Mg and precise determination of the magic wavelength
Creators: name: Kulosa, André Philipp
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Optical atomic clocks
subject: magic wavelength
subject: optical spectroscopy of Bloch bands
subject: Optische Atomuhr
subject: magische Wellenlänge
subject: optische Spektroskopie der Blochbänder
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Active Galactic Nucleus and Extended Starbursts in a Mid-stage Merger VV114
Creators: name: Iono, D.
name: Saito, T.
name: Yun, M. S.
name: Kawabe, R.
name: Espada, D.
name: Hagiwara, Y.
name: Imanishi, M.
name: Izumi, T.
name: Kohno, K.
name: Motohara, K.
name: Nakanishi, K.
name: Sugai, H.
name: Tateuchi, K.
name: Tamura, Y.
name: Ueda, J.
name: Yoshii, Y.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: High resolution (0.4 arcsec) Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 0 observations of HCO+(4-3) and HCN(4-3) toward a mid-stage infrared bright merger VV114 have revealed compact nuclear (<200 pc) and extended (3 - 4 kpc) dense gas distribution across the eastern part of the galaxy pair. We find a significant enhancement of HCN(4-3) emission in an unresolved compact and broad (290km/s) component found in the eastern nucleus of VV114, and we suggest dense gas associated with the surrounding material around an Active Galactic Nucleus (AGN), with a mass upper limit of < 4 x 10^8 Msun. The extended dense gas is distributed along a filamentary structure with resolved dense gas concentrations (230pc; 10^6 Msun) separated by a mean projected distance of 600 pc, many of which are generally consistent with the location of star formation traced in Pa alpha emission. Radiative transfer calculations suggest moderately dense (10^5 - 10^6 cm^-3) gas averaged over the entire emission region. These new ALMA observations demonstrate the strength of the dense gas tracers in identifying both the AGN and star formation activity in a galaxy merger, even in the most dust enshrouded environments in the local universe.
description: 5 pages, 4 figures, PASJ Letters accepted
Entwicklung von Mehrstufensynthesen unter Durchflussbedingungen
Creators: name: Kupracz, Lukas Peter
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Microreactors
subject: inductive heating
subject: flow chemistry
subject: multistep synthesis
subject: high temperature/high pressure reactions
subject: lithiation
subject: polymer-supported reagents
subject: heterocycles
subject: nanocatalysis
subject: combined mutasynthesis
subject: Mikroreaktoren
subject: induktives Heizen
subject: Durchflusschemie
subject: Mehrstufensynthesen
subject: Hochtemperatur-/Hochdruckreaktionen
subject: Lithiierungen
subject: polymergebundene Reagenzien
subject: Heterocyclen
subject: Nanokatalyse
subject: kombinierte Mutasynthese
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Educación Abierta. Búsqueda, selección y empleo de licencias abiertas y recursos educativos (Nivel B1)
Creators: name: Valverde-Berrocoso, Jesús
Publisher: name: Universidad de Extremadura
Year: 2023
Subjects: Competencia Digital Docente
Formación del Profesorado Universitario

description: 1. ¿Qué es la propiedad intelectual? ¿Para qué sirven los derechos de autor?

Copyright: todos los derechos reservados
Copyleft: algunos derechos reservados
Las licencias Creative Commons: uso e interpretación
2. La «Educación Abierta» en la universidad

Concepto y dimensiones
Oxidoreduktasen aus Agaricomyceten für Lebensmittel- und Waschmittelanwendungen
Creators: name: Lanfermann, Laura Isabel Friederike
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Oxidising activity
subject: 4-hydroyxisoleucine
subject: beta-carotene degradation
subject: manganese peroxidase
subject: alkaline activity
subject: detergent
subject: Oxidierende Aktivität
subject: Laetiporus sulphureus
subject: Sotolon
subject: 4-Hydroyxisoleucin
subject: Oxygenase
subject: Ganoderma applanatum
subject: Beta-Carotin-Abbau
subject: Manganperoxidase
subject: alkalisches Wirkoptimum
subject: Waschmittel
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: [no abstract]
Dual conformal symmetry on the light-cone
Creators: name: Derkachov, S. E.
name: Korchemsky, G. P.
name: Manashov, A. N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the properties of conformal operators in the SL(2) sector of planar N=4 SYM and its supersymmetric SL(2|2) extension. The correlation functions of these operators and their form factors with respect to asymptotic on-shell states are determined in the appropriate limit by two different polynomials which can be identified as eigenstates of the dilatation operator in the coordinate and momentum representations, respectively. We argue that, in virtue of integrability of the dilatation operator, the two polynomials satisfy a duality relation -- they are proportional to each other upon an appropriate identification of momenta and coordinates. Combined with the conventional N=4 superconformal symmetry, this leads to the dual superconformal symmetry of the dilatation operator. We demonstrate that this symmetry is powerful enough to fix the eigenspectrum of the dilatation operator to the lowest order in the coupling. We use the relation between the one-loop dilatation operator and Heisenberg spin chain to show that, to lowest order in the coupling, the dual symmetry is generated by the Baxter Q-operator in the limit of large spectral parameter.
description: 27 pages
Emergence of superconductivity at 45 K by lanthanum and phosphorus co-doping of CaFe2As2
Creators: name: Kudo, Kazutaka
name: Iba, Keita
name: Takasuga, Masaya
name: Kitahama, Yutaka
name: Matsumura, Jun-ichi
name: Danura, Masataka
name: Nogami, Yoshio
name: Nohara, Minoru
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Co-doping of lanthanum and phosphorus in CaFe2As2 induces superconductivity at 45 K. This superconducting transition temperature is higher than the 38 K transition in Ba1-xKxFe2As2, which is the maximum found thus far among the 122 phases. Superconductivity with a substantial shielding volume fraction was observed at 0.12 $\leq$ x $\leq$ 0.18 and y = 0.06 in Ca1-xLaxFe2(As1-yPy)2. The superconducting phase of the present system seems to be not adjacent to an antiferromagnetic phase.
description: 13 pages, 4 figures
Empirische Studien zu Aspekten des Humankapitals : zweiter Bildungsweg, Mitgliedschaften, Pflichtdienste
Creators: name: Koch-Sterrenberg, Margret
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Human capital
subject: second educational pathway
subject: career interruption
subject: membership
subject: socio-economic outcomes
subject: Humankapital
subject: zweiter Bildungsweg
subject: Karriereunterbrechung
subject: Mitgliedschaft
subject: sozio-ökonomische Ergebnisse
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::370 | Erziehung, Schul- und Bildungswesen

description: [no abstract]
Spin currents in non-inertial frames
Creators: name: Papini, Giorgio
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The covariant Dirac equation and its solutions show that rotation and acceleration can be used to generate and control spin currents.
description: 8 pages
Ableitung humaner mesenchymaler Zelltypen aus induzierten pluripotenten Stammzellen
Creators: name: Weist, Ramona
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Mesenchymal stem cells
subject: induced pluripotent stem cells
subject: embryoid body-method
subject: monolayer-method
subject: Mesenchymale Stammzellen
subject: induzierte pluripotente Stammzellen
subject: iPS-MSC
subject: embryoid Body-Methode
subject: Monolayer-Methode
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Ballistic collective group delay and its Goos-Hänchen component in graphene
Creators: name: Song, Yu
name: Wu, Han-Chun
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically investigate the experimental observable of the ballistic collective group delay (CGD) of all the particles on the Fermi surface in graphene. First, we reveal that, lateral Goos-Hänchen (GH) shifts along barrier interfaces contribute an inherent component in the individual group delay (IGD). Then, by linking the complete IGD to spin precession through a dwell time, we suggest that, the CGD and its GH component can be electrostatically measured by a conductance difference in a spin-precession experiment under weak magnetic fields. Such an approach is feasible for almost arbitrary Fermi energy. We also indicate that, it is a generally nonzero self-interference delay that relates the IGD and dwell time in graphene.
description: 6 printed pages including 5 figures. arXiv admin note: text overlap with arXiv:1205.6984
Entangling quantum gate in trapped ions via Rydberg blockade
Creators: name: Li, Weibin
name: Lesanovsky, Igor
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present a theoretical analysis of the implementation of an entangling quantum gate between two trapped Ca$^+$ ions which is based on the dipolar interaction among ionic Rydberg states. In trapped ions the Rydberg excitation dynamics is usually strongly affected by mechanical forces due to the strong couplings between electronic and vibrational degrees of freedom in inhomogeneous electric fields. We demonstrate that this harmful effect can be overcome by using dressed states that emerge from the microwave coupling of nearby Rydberg states. At the same time these dressed states exhibit long range dipolar interactions which we use to implement a controlled adiabatic phase gate. Our study highlights a route towards a trapped ion quantum processor in which quantum gates are realized independently of the vibrational modes.
description: submitted to the special issue "Wolfgang Paul 100"
Noncommutative geometry inspired wormholes with conformal motion
Creators: name: Rahaman, Farook
name: Ray, Saibal
name: Khadekar, G. S.
name: Kuhfittig, P. K. F.
name: Karar, Indrani
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: This paper discusses a new wormhole solution that admits conformal motion, given a noncommutative-geometry background. After a discussion of the wormhole geometry and the energy conditions, the analysis proceeds with the calculation of the active gravitational mass, a discussion of the TOV equation describing the equilibrium conditions, as well as the nature of the total gravitational energy. The wormhole spacetime is not asymptotically flat and is therefore cut off at some radial distance and joined to an exterior vacuum solution.
description: Latex, 7 pages, 8 figures
Entscheidungsanalytische Modellierung als Instrument gesundheitsökonomischer Evaluationen
Creators: name: Kuhlmann, Alexander
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Health economic evaluation
subject: decision-analytic modeling
subject: cost-effectiveness analysis
subject: Gesundheitsökonomische Evaluationen
subject: entscheidungsanalytische Modellierungen
subject: Kosten-Effektivitäts-Analysen
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: [no abstract]
Role of Joule Heating on Current Saturation and Transient Behavior of Graphene Transistors
Creators: name: Islam, Sharnali
name: Li, Zuanyi
name: Dorgan, Vincent E.
name: Bae, Myung-Ho
name: Pop, Eric
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We use simulations to examine current saturation in sub-micron graphene transistors on SiO2/Si. We find self-heating is partly responsible for current saturation (lower output conductance), but degrades current densities >1 mA/um by up to 15%. Heating effects are reduced if the supporting insulator is thinned, or in shorter channel devices by partial heat sinking at the contacts. The transient behavior of such devices has thermal time constants of ~30-300 ns, dominated by the thickness of the supporting insulator and that of device capping layers (a behavior also expected in ultrathin body SOI transistors). The results shed important physical insight into the high-field and transient behavior of graphene transistors.
description: IEEE Electron Device Letters, DOI: 10.1109/LED.2012.2230393 (2013)
SS-Mediziner zwischen Lagerdienst und Fronteinsatz : die personelle Besetzung der medizinischen Abteilung im Konzentrationslager Sachsenhausen 1936-1945
Creators: name: Pukrop, Marco
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Nationalsocialism
subject: concentration camps
subject: medical history
subject: Nationalsozialismus
subject: Konzentrationslager
subject: Medizingeschichte
subject: Dewey Decimal Classification::900 | Geschichte und Geografie::940 | Geschichte Europas::943 | Geschichte Mitteleuropas; Deutschlands

description: [no abstract]
Elektrochemische Charakterisierung von lithiierten Titandioxid-Nanoröhren
Creators: name: Wittich, Olga
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: TiO2 nanotubes
subject: hydrothermal synthesis
subject: Li-intercalation
subject: TiO2-Nanoröhren
subject: Hydrothermalsynthese
subject: Li-Interkalation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Ultracold chemistry and its reaction kinetics
Creators: name: Richter, Florian
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Ultracold quantum gases
subject: ultracold molecules
subject: entanglement
subject: Ultrakalte Quantengase
subject: ultrakalte Moleküle
subject: Verschränkung
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Active and passive reduction of high order modes in the gravitational wave detector GEO 600
Creators: name: Wittel, Holger
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: GEO 600
subject: gravitational wave detector
subject: high order modes
subject: thermal compensation
subject: astigmatism
subject: Gravitationswellendetektor
subject: Moden höherer Ordnung
subject: thermische Kompensation
subject: Astigmatismus
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Die Rechte der Tiere im Qur'an und in den Ḥadiṯen
Creators: name: Yıldırım, Ramazan
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Koran
subject: Hadith
subject: animals
subject: animal rights
subject: Qur'an
subject: Ḥadiṯe
subject: Tiere
subject: Tierrechte
subject: Dewey Decimal Classification::200 | Religion, Religionsphilosophie::290 | Andere Religionen

description: [no abstract]
Magnetoelectric Resonances and Predicted Microwave Diode Effect of Skyrmion Crystal in Multiferroic Chiral-Lattice Magnet
Creators: name: Mochizuki, Masahito
name: Seki, Shinichiro
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We theoretically discover that unique eigenmodes of skyrmion crystal (SkX) are not only magnetically active to ac magnetic field (H^w) but also electrically active to ac electric field (E^w) in a multiferroic chiral-lattice magnet Cu2OSeO3, which amplifies the dynamical magnetoelectric coupling between E^w and the spin texture. The resulting intense interference between their electric and magnetic activation processes can lead to unprecedentedly large diode effect on the microwave, i.e., its absorption by SkX changes up to ~20% when the incident direction is reversed. Our results demonstrate that the skyrmion can be a promising building block for microwave devices.
description: 5 pages, 4 figures, accepted for publication in Phys. Rev. B
Die Auswirkungen zweier unterschiedlicher Trainingsmethoden auf die Sprint- und Erholungsfähigkeit in einem Zeitraum von 3 Monaten : Vergleich von intervallartigem Training und Dauertraining
Creators: name: Wendt, Marcel
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Sprint ability
subject: repeated sprint ability
subject: interval training
subject: wingate-test
subject: Sprintfähigkeit
subject: Erholungsfähigkeit
subject: Intervalltraining
subject: Wingate-Test
subject: Dewey Decimal Classification::700 | Künste, Bildende Kunst allgemein::790 | Freizeitgestaltung, Darstellende Kunst::796 | Sport

description: [no abstract]
Iodine stabilized diode laser using Noise-Immune Cavity-Enhanced Optical Heterodyne Molecular Spectroscopy for the practical realisation of the meter at 633 nm
Creators: name: Krause, Florian
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2022
Subjects: subject: diode laser
subject: optical cavity
subject: Pound-Drever-Hall
subject: NICE-OHMS
subject: fm-spectroscopy
subject: saturation spectroscopy
subject: iodine
subject: SI-unit meter
subject: Diodenlaser
subject: optischer Resonator
subject: FM-Spektroskopie
subject: Sättigungs Spektroskopie
subject: Iod
subject: SI-Einheit Meter
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: In this thesis a new practical realization of the meter at a wavelength of 633 nm with a diode laser stabilized on iodine is investigated, with the aim of replacing the old technology of He-Ne lasers with more effective diode lasers. The frequency of an external cavity diode laser is stabilized to the Doppler-free hyperfine transitions of iodine (127^I_2) using noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) technique. The performance of the system was investigated in comparison to a primary Cs atomic clock via a frequency comb. The diode laser is stabilized by using the NICE-OHMS method to a 14 cm external cavity containing a 10 cm long iodine cell. It achieves a short time frequency instability of 1.4 · 10^(−12) for an averaging time of 1 s, an improvement by a factor of four compared to an iodine stabilized He-Ne laser, which is widely used as practical realization of the meter. The uncertainty of the NICE-OHMS system is 28 kHz. Practical experiments as well as simulations are performed to identify effects that influence the frequency of the laser. To replace two-mode or Zeeman-stabilized He-Ne lasers, also a shoe box size diode laser system stabilized to Doppler broadened iodine lines is investigated. This system, which uses a 3 cm iodine cell, covers a frequency range of several 100 GHz, and achieves an output power of 5 mW. It automatically stabilizes to iodine lines and has a frequency instability of 2·10^(−10) for averaging times of 1 s, which is adequate for industrial interferometry applications.
Contenidos digitales. Creación y modificación de recursos digitales (Nivel B2)
Creators: name: Valverde-Berrocoso, Jesús
Publisher: name: Universidad de Extremadura
Year: 2023
Subjects: Competencia Digital Docente
Formación del Profesorado Universitario

description: 1. Propiedad intelectual y derechos de autor.

Una breve historia del copyright y el derecho de autor.
El copyright en la academia y la investigación.
Las licencias copyleft: Creative Commons (CC).
2. Los Recursos Educativos Abiertos (REA).

Definición.
Tipologías.
Parameterized Complexity of 1-Planarity
Creators: name: Bannister, Michael J.
name: Cabello, Sergio
name: Eppstein, David
Publisher: name: arXiv
Year: 2013
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: We consider the problem of finding a 1-planar drawing for a general graph, where a 1-planar drawing is a drawing in which each edge participates in at most one crossing. Since this problem is known to be NP-hard we investigate the parameterized complexity of the problem with respect to the vertex cover number, tree-depth, and cyclomatic number. For these parameters we construct fixed-parameter tractable algorithms. However, the problem remains NP-complete for graphs of bounded bandwidth, pathwidth, or treewidth.
description: WADS 2013
Quantum metrology with Einstein-Podolsky-Rosen entangled atoms
Creators: name: Kruse, Ilka
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Einstein-Podolsky-Rosen entanglement
subject: quantum metrology
subject: automatized optimization
subject: Einstein-Podolsky-Rosen-Verschränkung
subject: Quantenmetrologie
subject: automatisierte Optimierung
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

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

description: G. triflorum M:ichaux (G. suaveolens Wahlenb.) 3: Bei Pralong (Val d'Heremence), linkes Ufer der Dixence, «1600m» (Köhler1899;vgl. Köhler Lit. 1899a); die Fundstelle liegt etwas unterhalb der Brücke, bei 1620-1630 m, im untersten Teil einer von Fichten beschatteten, steinigen und moosigenRunse (Thommen 1954).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Isolierung und Strukturaufklärung von Sekundärmetaboliten aus epiphytischen Mikroorganismen
Creators: name: Pietzner, Anne
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Natural products
subject: epiphytes
subject: structure elucidation
subject: Naturstoffe
subject: Epiphyten
subject: Strukturaufklärung
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Untersuchung des modularen Direktumrichters "Hexverter"
Creators: name: Baruschka, Lennart
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Cyclo converter
subject: three phase converter
subject: modular multilevel converter
subject: modular multilevel matrix converter
subject: Direktumrichter
subject: dreiphasiger Umrichter
subject: modularer Multilevel-Umrichter
subject: Hexverter
subject: modularer Multilevel-Matrix-Umrichter
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: [no abstract]
Polymere Nanokomposite mit gezielt einstellbaren optischen Eigenschaften
Creators: name: Schneider, Uwe
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2016
Subjects: subject: Polymer nanocomposites
subject: refractive index
subject: Suzuki-Miyaura cross-coupling
subject: Polymere Nanokomposite
subject: Brechungsindex
subject: Suzuki-Miyaura Kreuzkupplung
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Magnetohydrodynamic waves driven by p-modes
Creators: name: Khomenko, Elena
name: Santamaria, Irantzu Calvo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Waves are observed at all layers of the solar atmosphere and the magnetic field plays a key role in their propagation. While deep down in the atmosphere the p-modes are almost entirely of acoustic nature, in the upper layers magnetic forces are dominating, leading to a large variety of new wave modes. Significant advances have been made recently in our understanding of the physics of waves interaction with magnetic structures, with the help of analytical theories, numerical simulations, as well as high-resolution observations. In this contribution, we review recent observational findings and current theoretical ideas in the field, with an emphasis on the following questions: (i) Peculiarities of the observed wave propagation in network, plage and facular regions; (ii) Role of the mode transformation and observational evidences of this process; (iii) Coupling of the photosphere, chromosphere, and above by means of waves propagating in magnetic structures.
description: Proceeding of meeting "Eclipse on the Coral Sea: Cycle 24 Ascending GONG 2012 / LWS/SDO-5 / SOHO 27", November 12 - 16, 2012, Palm Cove, Queensland
Acoustically regulated carrier injection into a single optically active quantum dot
Creators: name: Schülein, Florian J. R.
name: Müller, Kai
name: Bichler, Max
name: Koblmüller, Gregor
name: Finley, Jonathan J.
name: Wixforth, Achim
name: Krenner, Hubert J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the carrier injection into a single InGaAs/GaAs quantum dot regulated by a radio frequency surface acoustic wave. We find that the time of laser excitation during the acoustic cycle programs both the emission intensities and time of formation of neutral $(X^0)$ and negatively charged $(X^-)$ excitons. We identify underlying, characteristic formation pathways of both few-particle states in the time-domain experiments and show that both exciton species can be formed either with the optical pump or at later times by injection of single electrons and holes "surfing" the acoustic wave. All experimental observations are in excellent agreement with calculated electron and hole trajectories in the plane of the two-dimensional wetting layer which is dynamically modulated by the acoustically induced piezoelectric potentials. Taken together, our findings provide insight on both the onset of acousto-electric transport of electrons and holes and their conversion into the optical domain after regulated injection into a single quantum dot emitter.
Security of high-dimensional quantum key distribution protocols using Franson interferometers
Creators: name: Brougham, Thomas
name: Barnett, Stephen M.
name: McCusker, Kevin T.
name: Kwiat, Paul G.
name: Gauthier, Daniel J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Franson interferometers are increasingly being proposed as a means of securing high-dimensional energy-time entanglement-based quantum key distribution (QKD) systems. Heuristic arguments have been proposed that purport to demonstrate the security of these schemes. We show, however, that such systems are vulnerable to attacks that localize the photons to several temporally separate locations. This demonstrates that a single pair of Franson interferometers is not a practical approach to securing high-dimensional energy-time entanglement based QKD. This observations leads us to investigate the security of modified Franson-based-protocols, where Alice and Bob have two or more Franson interferometers. We show that such setups can improve the sensitivity against attacks that localize the photons to multiple temporal locations. While our results do not constituting a full security proof, they do show that a single pair of Franson interferometers is not secure and that multiple such interferometers could be a promising candidate for experimentally realizable high-dimensional QKD.
description: 14 pages (single column format)
Hopping thermoelectric transport in finite systems: boundary effects
Creators: name: Jiang, J. -H.
name: Entin-Wohlman, O.
name: Imry, Y.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: It is shown that for the hopping regime, the thermopowers in both finite two-terminal and three-terminal systems are governed by the edges of the samples. This is due to the fact that the energy transfer between a transport electron and a conducting terminal is determined by the site most strongly coupled to that terminal. One-dimensional systems with both nearest-neighbor and variable-range transport as well as certain types of two-dimensional systems, are considered. For a given sample, the changes in the thermopowers due to modifying the bulk are quite limited, compared with those of the conductance. When the small thermopower changes exist, their average over a large ensemble of mesoscopic samples will vanish. We also obtain the distribution of the thermopower in such an ensemble and show that its width approaches a finite limit with increasing sample length. This contrasts with the distribution of conductances in such systems, whose width vanishes in the long sample limit. Finally, we find that the thermal conductances in the three-terminal case have a boundary-dominated contribution, due to non-percolating conduction paths. This contribution can become dominant when the usual conductance is small enough. All our theoretical statements are backed by numerical computations.
An analytically solvable benchmark problem for fluid-structure interaction with uncertain parameters
Creators: name: Kratzke, Jonas
name: Heuveline, Vincent
Publisher: name: Heidelberg University, Interdisciplinary Center for Scientific Computing (IWR)
Year: 2016
Subjects: Applied Mathematics; FSI; UQ; benchmark

description: In simulating fluid-structure interaction, e.g. for the biomechanical dynamics of aortic blood flow, a profound benchmarking of the numerical solver is a basic prerequisite. We consider a test scenario for a fluid-structure interaction solver including uncertain model parameters that has an analytical solution.

The solver is developed to simulate the flow and movement of the human aorta. In simulating the biomechanical dynamics of aortic blood flow, there are usually high uncertainties with respect to the model itself and with respect to the input parameters such as the stiffness of the vessel wall. If numerical simulation is considered to provide assistance in a clinical context, these uncertainties also have to be reflected in the simulation results for reliability.

To verify a solver for fluid-structure interaction with uncertain parameters, we introduce a benchmark problem for which we derive an analytical solution. The benchmark is based on the Taylor-Couette flow system with an additional solid domain surrounding the fluid domain. Whereas the analytical solution is stated in polar coordinates, the problem is non-trivial for solvers based on the Cartesian coordinate system. The stochastic space is discretised by means of a generalised Polynomial Chaos expansion. By Galerkin projection on the stochastic basis, we obtain an intrusive Uncertainty Quantification method. The benchmarking results for the implemented solver are in well accordance with the theoretically expected convergence properties.
description: Preprint Series of the Engineering Mathematics and Computing Lab, No 2 (2016): An analytically solvable benchmark problem for fluid-structure interaction with uncertain parameters
Darstellungen aus der augusteischen Geschichte auf arretinischen Kelchen
Creators: name: Dragendorff, Hans
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2017

description: [nicht erschienen / not available]
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 19, Nr. 4 (1935)
Constant-temperature level densities in the quasi-continuum of Th and U isotopes
Creators: name: Guttormsen, M.
name: Jurado, B.
name: Wilson, J. N.
name: Aiche, M.
name: Bernstein, L. A.
name: Ducasse, Q.
name: Giacoppo, F.
name: Goergen, A.
name: Gunsing, F.
name: Hagen, T. W.
name: Larsen, A. C.
name: Lebois, M.
name: Leniau, B.
name: Renstroem, T.
name: Rose, S. J.
name: Siem, S.
name: Tornyi, T.
name: Tveten, G. M.
name: Wiedeking, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Particle-gamma coincidences have been measured to obtain gamma-ray spectra as a function of excitation energy for 231-233Th and 237-239U. The level densities, which were extracted using the Oslo method, show a constant temperature behavior. The isotopes display very similar temperatures in the quasi-continuum, however, the even-odd isotopes reveal a constant entropy increase Delta S compared to their even-even neighbors. The entropy excess depends on available orbitals for the last unpaired valence neutron of the heated nuclear system. Also, experimental microcanonical temperature and heat capacity have been extracted. Several poles in the heat capacity curve support the idea that an almost continuous melting of Cooper pairs is responsible for the constant-temperature behavior.
description: 9 figures
The role of the ERC-20 token standard in a financial revolution: the case of Initial Coin Offerings
Creators: name: Cuffe, Paul
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 460805
subject: Fairness, accountability, transparency, trust and ethics of computer systems
classificationCode: 380107
subject: Financial economics

description: Submitted to the IEC-IEEE-KATS Academic Challenge, Busan, Korea, 22-23 October 2018

Abstract:

The year of 2017 saw a surge of interest in a curious new way to raise capital: the `Initial Coin Offering' (ICO). In this style of crowdfunding, investors exchange a general-purpose cryptocurrency, such as Bitcoin (BTC) or Ethereum (ETH), for a branded and special-use blockchain token, which somehow underpins or represents the project that is being funded. Billions of dollars worth of capital has already been raised through these schemes, and these huge transfers have motivated diverse, and often skeptical, commentary. However, the technical standards which underpin these schemes have often passed unremarked, even though they were, arguably, the catalyst for the huge growth witnessed in this sector. The present work will elucidate how an informal standard for smart contracts on the Ethereum blockchain, labelled ERC-20, has enabled the wide proliferation of special purpose fundraising tokens. Crucially, the ERC-20 standard allows frictionless interoperability, so that any compliant Ethereum wallet software can transact and monitor the full range of compliant tokens. In this way, the short and rather dry ERC-20 document allows any Ethereum wallet to control a diverse portfolio of token investments, and it is precisely this interoperability that has permitted the vast capital transfers of the ICO era. The present work will briefly survey the short history of this technology and will discuss some implications that this disruption presents for technical standardisation bodies.
Der Faktor Mensch bei der Risikosteuerung öffentlicher Bauvorhaben in Kenia
Creators: name: Sungura, Nicholas
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2016
Subjects: subject: Human element
subject: risk management
subject: public infrastructure
subject: Faktor Mensch
subject: Risikosteuerung
subject: öffentliche Bauvorhaben
subject: Dewey Decimal Classification::600 | Technik::690 | Hausbau, Bauhandwerk

description: [no abstract]
Local tadpole galaxies: dynamics and metallicity
Creators: name: Almeida, J. Sanchez
name: Munoz-Tunon, C.
name: Elmegreen, D. M.
name: Elmegreen, B. G.
name: Mendez-Abreu, J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Tadpole galaxies, with a bright peripheral clump on a faint tail, are morphological types unusual in the nearby universe but very common early on. Low mass local tadpoles were identified and studied photometrically in a previous work, which we complete here analyzing their chemical and dynamical properties. We measure Halpha velocity curves of seven local tadpoles, representing 50% of the initial sample. Five of them show evidence for rotation (sim 70%), and a sixth target hints at it. Often the center of rotation is spatially offset with respect to the tadpole head (3 out of 5 cases). The size and velocity dispersion of the heads are typical of giant HII regions, and three of them yield dynamical masses in fair agreement with their stellar masses as inferred from photometry. In four cases the velocity dispersion at the head is reduced with respect to its immediate surroundings. The oxygen metallicity estimated from [NII]6583/Halpha often shows significant spatial variations across the galaxies (sim 0.5 dex), being smallest at the head and larger elsewhere. The resulting chemical abundance gradients are opposite to the ones observed in local spirals, but agrees with disk galaxies at high redshift. We interpret the metallicity variation as a sign of external gas accretion (cold-flows) onto the head of the tadpole. The galaxies are low metallicity outliers of the mass-metallicity relationship. In particular, two of the tadpole heads are extremely metal poor, with a metallicity smaller than a tenth of the solar value. These two targets are also very young (ages smaller than 5 Myr). All these results combined are consistent with the local tadpole galaxies being disks in early stages of assembling, with their star formation sustained by accretion of external metal poor gas.
description: Accepted for publication in ApJ. 17 pages, 13 Figs
Netzlastabhängige Dienstgütebewertung in Fahrzeug-zu-Fahrzeug-Kommunikationsnetzen
Creators: name: Schumacher, Henrik
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2016
Subjects: subject: VANET
subject: ITS-G5
subject: vehicle-to-vehicle communication
subject: Fahrzeug-zu-Fahrzeug-Kommunikation
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: [no abstract]