cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On Quantum Computing and Pseudorandomness
Creators: name: Fefferman, William Jason
Publisher: name: California Institute of Technology
Year: 2011
Subjects: Pseudorandomness
Quantum Computing
Computer Science

description: The relationship between efficient verification and quantum computing is one of the most important and least well-understood questions in the theory of computation.  In particular, is there a problem that can be solved efficiently on a quantum computer that cannot be verified?  In this thesis we give evidence that BQP ⊄ PH, relating the classes of languages decidable with a quantum computer to a generalization of NP.  In so doing we connect a question in pseudorandomness, first studied [BSW03] to the problem of finding an oracle relative to which BQP ⊄ PH.  The primary technical challenge is to construct a unitary matrix, realized by an efficient quantum circuit and whose rows are supported on nearly disjoint subsets.  Using this matrix and assuming the validity of the aforementioned question in pseudorandomness, we show an instantiation of the Nisan-Wigderson pseudorandom generator that can be broken with quantum computers, but not with the relevant mode of classical computation.
Supersaturation in the Boolean lattice
Creators: name: Dove, Andrew P.
name: Griggs, Jerrold R.
name: Kang, Ross J.
name: Sereni, Jean-Sébastien
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We prove a "supersaturation-type" extension of both Sperner's Theorem (1928) and its generalization by Erdos (1945) to k-chains. Our result implies that a largest family whose size is x more than the size of a largest k-chain free family and that contains the minimum number of k-chains is the family formed by taking the middle (k-1) rows of the Boolean lattice and x elements from the k-th middle row. We prove our result using the symmetric chain decomposition method of de Bruijn, van Ebbenhorst Tengbergen, and Kruyswijk (1951).
Polieren keramischer Knieimplantate mit nachgiebigen Diamantwerkzeugen
Creators: name: Müller, Anke
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Implant technology
subject: ceramics
subject: finishing processes
subject: polishing
subject: Implantattechnik
subject: Keramik
subject: Feinbearbeitung
subject: Polieren
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: [no abstract]
Critical and tricritical behavior of a selectively diluted triangular Ising antiferromagnet in a field
Creators: name: Borovský, M.
name: Žukovič, M.
name: Bobák, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a geometrically frustrated triangular Ising antiferromagnet in an external magnetic field which is selectively diluted with nonmagnetic impurities employing an effective-field theory with correlations and Monte Carlo simulations. We focus on the frustration-relieving effects of such a selective dilution on the phase diagram and find that it can lead to rather intricate phase diagrams in the dilution-field parameters space. In particular, in a highly (weakly) diluted system the frustration is greatly (little) relieved and such a system is found to display only the second(first)-order phase transitions at any field. On the other hand, for a wide interval of intermediate dilution values the transition remains second order at low fields but it changes to first order at higher fields and the system displays a tricritical behavior. The existence of the first-order transition in the region of intermediate dilution and high fields is verified by Monte Carlo simulations.
description: 25 pages, 8 figures
Potentilla salisburgensis Hoppe
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: E.salisburgensis Hoppe Cat. 281. Bis 3300 m: Oberrothorn bei Zermatt (Braun-Blanquet1919). l: Tour de Don ob Vionnaz (J.); La Balmaz (Coquoz); Col du Jorat (Exk. Soc. Murith.); Salvan (J.); Barberine (J.); La Bätiaz bei]V[artigny (Heinis und Wirz). - 2: Sitten (Schröter);ob Ayent (P.); Aletschgletscher (Townsend). - 3: Valsorey (Guyot); Col du Lens (Closuit); Alpen von Riddes (Besse);Val des Dix (O. Meylan);Niouc (J.); Pfyn (J.); Törbel (Stehler); Brig (Wikzek). 3a: Gondo und Umgebung (Becherer). - 4: Grengiols (Schmid); Binntal, mehrfach (Binz); Furka (Haussknecht). Var. procera Grenier - l: Tanay (P.); Gueuroz (Closuit); Outre-Rhöne (Gams). - 2: Branson (Gams). - 3: Sembrancher (Zahn). - 4: Oberwald (Zahn). Var. subalpina Grenier - 3: Randa (Huber). - 4: Rappental (B. C. W.). Var. permixta Gremli -3: Val de Bagnes (P.); Herbriggen-Randa (Huber); Randa (idem). Var. nana Gremli - 3: Bei Zermatt (P.); bei Saas-Fee (Hirschmann). Var. minuta Gremli - l: Barberine (Coquoz). - 3: Ob Zermatt (Thellung; Bestimmung unsicher). Var. macrodonta Gremli - 4: Blindental (B. C.W.); Reckingen (nach Wilczek); Oberwald (desgl.). Var. ramosissima Schröter - 3: Zermatt (P.). -4: Ausserbinn (P.). Var. purpurascens Favrat - 3: Catogne (Terretaz); Zinal gegen Lirec (Sulger); Hannigalp ob Grä- chen (Beauverd). - 4: Rappental (B. C. W.). Var. coerulescens Favrat - l: Vernayaz-Salvan(J.). Var. aurea Boullu - 3: Val de Bagnes (Bernoulli); Randa (Huber); ob Zermatt, mehrfach (Thellung, Kunz, Brosi). Var. marilaunica (Kerner) - 3a: Oberstes Zwischbergental unter der Gmeinalp, 1900-2000 m (Merxmüller).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Beiträge zur präzisen Bestimmung von Os-Isotopenverhältnissen
Creators: name: Krüger, Michael
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Osmium isotopy
subject: provenience analysis of gold artifacts
subject: reference material for fs-LA-ICP-MCMS
subject: Osmium
subject: Gold
subject: Osmiumisotopie
subject: Herkunftsanalyse von Goldartefakten
subject: Referenzmaterial für fs-LA-ICP-MCMS
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Effects of Electron-Electron Interactions on Electronic Raman Scattering of Graphite in High Magnetic Fields
Creators: name: Ma, Y.
name: Kim, Y.
name: Kalugin, N. G.
name: Lombardo, A.
name: Ferrari, A. C.
name: Kono, J.
name: Imambekov, A.
name: Smirnov, D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report the observation of strongly temperature-dependent, asymmetric spectral lines in electronic Raman scattering spectra of graphite in a high magnetic field up to 45 T applied along the c-axis. The magnetic field quantizes the in-plane motion, while the out-of-plane motion remains free, effectively reducing the system dimension from three to one. Optically created electron-hole pairs interact with, or shake up, the one-dimensional Fermi sea in the lowest Landau subbands. Based on the Tomonaga-Luttinger liquid theory, we show that interaction effects modify the van Hove singularity to the form $(ω-Δ)^{2α-1/2}$ at zero temperature. At finite temperature, we predict a thermal broadening factor that increases linearly with the temperature. Our model reproduces the observed temperature-dependent line-shape, determining $α$ to be $\sim$0.05 at 40 T.
description: 5 pages, 3 figures
Grundlegende Untersuchungen zur mikrobiellen Synthese von Vitamin B12 in symbiotischen pflanzlichen Systemen am Beispiel der Frankia : Entwicklung neuartiger pflanzlicher Extrakte mit hohem essentiellen Vitamin B12-Gehalt
Creators: name: Kysil, Olga Aleksandrovna
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Vitamin B12
subject: 5,6-Dimethylbenzimidazol
subject: Frankia alni
subject: 5,6-dimethylbenzimidazole
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
A Globally and Quadratically Convergent Algorithm with Efficient Implementation for Unconstrained Optimization
Creators: name: Yang, Yaguang
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: In this paper, an efficient modified Newton type algorithm is proposed for nonlinear unconstrianed optimization problems. The modified Hessian is a convex combination of the identity matrix (for steepest descent algorithm) and the Hessian matrix (for Newton algorithm). The coefficients of the convex combination are dynamically chosen in every iteration. The algorithm is proved to be globally and quadratically convergent for (convex and nonconvex) nonlinear functions. Efficient implementation is described. Numerical test on widely used CUTE test problems is conducted for the new algorithm. The test results are compared with those obtained by MATLAB optimization toolbox function {\tt fminunc}. The test results are also compared with those obtained by some established and state-of-the-art algorithms, such as a limited memory BFGS, a descent and conjugate gradient algorithm, and a limited memory and descent conjugate gradient algorithm. The comparisons show that the new algorithm is promising.
First-order corrections to the mean-field limit and quantum walks with non-orthogonal position states
Creators: name: Matjeschk, Robert
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Mean field theory
subject: many-particle systems
subject: quantum physics
subject: Meanfieldnäherung
subject: Vielteilchensysteme
subject: Quantenphysik
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Orientation of the Angular Momentum in Superfluid 3He-A in a Stretched Aerogel
Creators: name: Li, J. I. A.
name: Zimmerman, A. M.
name: Pollanen, J.
name: Collett, C. A.
name: Gannon, W. J.
name: Halperin, W. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Superfluid 3He-A in a fully characterized stretched aerogel, used in previous work [1], has been studied for parallel and perpendicular orientations of the magnetic field relative to the anisotropy axis of the aerogel. Consistently, we find that an equal spin pairing state (ESP) is stabilized down to the lowest temperature. From our pulsed NMR frequency shifts as a function of temperature and tip angle, the orientation of the orbital angular momentum l has been determined. The aerogel anisotropy introduced by uniaxial stretching tends to align l in the axial state parallel to the strain axis, confirming the theory proposed by Sauls [2] and contrary to the prediction of Volovik [3] based on an impurity calculation of Rainer and Vuorio [4].
description: 3 pages, 3 figures
Heavy-ion Acceleration and Self-generated Waves in Coronal Shocks
Creators: name: Battarbee, Markus
name: Laitinen, Timo
name: Vainio, Rami
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Context: Acceleration in coronal mass ejection driven shocks is currently considered the primary source of large solar energetic particle events. Aims: The solar wind, which feeds shock-accelerated particles, includes numerous ion populations, which offer much insight into acceleration processes. We present first simulations of shock-accelerated minor ions, in order to explore trapping dynamics and acceleration timescales in detail. Methods: We have simulated diffusive shock acceleration of minor ions (3He2+, 4He2+, 16O6+ and 56Fe14+) and protons using a Monte Carlo method, where self-generated Alfvénic turbulence allows for repeated shock crossings and acceleration to high energies. Results: We present the effect of minor ions on wave generation, especially at low wavenumbers, and show that it is significant. We find that maximum ion energy is determined by the competing effects of particle escape due to focusing in an expanding flux tube and trapping due to the amplified turbulence. We show the dependence of cut-off energy on the particle charge to mass ratio to be approximately (Q/A)^1.5. Conclusions: We suggest that understanding the acceleration of minor ions at coronal shocks requires simulations which allow us to explore trapping dynamics and acceleration timescales in detail, including evolution of the turbulent trapping boundary. We conclude that steady-state models do not adequately describe the acceleration of heavy ions in coronal shocks.
description: 6 pages, 5 figures
Landen inequalities for special functions
Creators: name: Baricz, Árpád
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 39B62, 33C05

description: In this paper our aim is to present some Landen inequalities for Gaussian hypergeometric functions, confluent hypergeometric functions, generalized Bessel functions and for general power series. Our main results complement and generalize some known results in the literature.
description: 7 pages, to be published in Proc. Amer. Math. Soc
In Vivo Quantification of Clot Formation in Extracorporeal Circuits
Creators: name: David, Omid
name: Gerrah, Rabin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Medical Physics (physics.med-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Clot formation is a common complication in extracorporeal circuits. In this paper we describe a novel method for clot formation analysis using image processing. We assembled a closed extracorporeal circuit and circulated blood at varying speeds. Blood filters were placed in downstream of the flow, and clotting agents were added to the circuit. Digital images of the filter were subsequently taken, and image analysis was applied to calculate the density of the clot. Our results show a significant correlation between the cumulative size of the clots, the density measure of the clot based on image analysis, and flow duration in the system.
description: In Proceedings of 20th NextMed Medicine Meets Virtual Reality Conference (NextMed / MMVR20), San Diego, CA, February 2013
Oberflächenleitfähigkeit an nanoskaligen und topologischen Systemen
Creators: name: Kühnemund, Lisa
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Surface conductivity
subject: nanostructures
subject: silicon nanorods
subject: topological insulators
subject: four tip STM
subject: Oberflächenleitfähigkeit
subject: Nanostrukturen
subject: Silizium-Nanorods
subject: Si(111)√3 x √3-R30°-Ag
subject: topologische Isolatoren
subject: Bi2Te2Se
subject: vier-Spitzen-STM
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Quantum-dense metrology for substraction of back-scatter disturbances in gravitational-wave detection
Creators: name: Ast, Melanie
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Gravitational-wave detection
subject: squeezed light
subject: scattered light
subject: two-mode-squeezing
subject: quantum-dense metrology
subject: Gravitationswellen-Detektion
subject: gequetschtes Licht
subject: Streulicht
subject: zwei-Moden-gequetschtes Licht
subject: quantendichte Messung
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Umweltethische Reflexionen für einen zukunftsfähigen Geographieunterricht im Kontext des globalen Wandels
Creators: name: Böttcher, Martin
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Umweltethik
subject: Verantwortung
subject: Dreischritt: Erkennen - Bewerten - Handeln. - Environmental ethics
subject: responsibility
subject: threefold step: look - judge - act
subject: Dewey Decimal Classification::900 | Geschichte und Geografie
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::370 | Erziehung, Schul- und Bildungswesen

description: [no abstract]
On the relationship between the size and surface coverage of starspots on magnetically active low-mass stars
Creators: name: Jackson, R. J.
name: Jeffries, R. D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a model that predicts the light curve amplitude distribution for an ensemble of low-mass magnetically active stars, under the assumptions that stellar spin axes are randomly orientated and that cool starspots have a characteristic scale length and are randomly distributed across the stellar surfaces. The model is compared with observational data for highly magnetically active M-dwarfs in the young cluster NGC 2516. We find that the best fitting starspot scale length is not constrained by these data alone, but requires assumptions about the overall starspot filling factor and starspot temperature. Assuming a spot coverage fraction of 0.4+/-0.1 and a starspot to unspotted photosphere temperature ratio of 0.7+/-0.05, as suggested by the inflated radii of these stars compared to evolutionary model predictions and by TiO band measurements on other active cool stars of earlier spectral type, the best-fitting starspot angular scale length is 3.5(+2)(-1) degrees, or a linear scale length of \sim 25000 km. This linear scale length is similar to large sunspot groups, but 2--5 times smaller than the starspots recently deduced on an active G-dwarf using eclipse mapping by a transiting exoplanet. However, the best-fitting spot scale length in the NGC 2516 M-dwarfs increases with the assumed spot temperature ratio and with the inverse square root of the assumed spot filling factor. Hence the light curve amplitude distribution might equally well be described by these larger spot scale lengths if the spot filling factors are <0.1 or the spot temperature ratio is >0.9.
description: Accepted for publication in MNRAS
Sempervivum christii Favrat
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: E. Christii Favrat Cat. 281und 430. Vgl. Becherer Lit. 1952. In den Distr. 3 (selten) und 3a (Hauptverbreitung); Angabe aus Distr. 4 (Riederalp, nach Wolf) unsicher. 3:DieAngabenausdemValdeBagnes (Alp Vingthuitob Mauvoisin,nachRikli) undvon Zermatt (nach Wolf) sind irrig. Art dagegen sicher, wenngleich sporadisch, im Saastal vorkommend: ob Fee gegen den Mellig (Prof. E. Fischer1892), ferner an zwei Stellen im Mattmarkgebiet:Mattmark gegen das Nollenhorn, 2200-2300m (Zoller 1950) und westlich der Hütten der Schwarzbergalp, etwa 2450 m (Kunz 1954). - 3a: Mehrere Stellen an der Westflanke der Bergkette Hübschhorn-Breithorn-Kessihorn-Rothorn (bis 2570 m am Glatthorn, abwärts bis 1550 m in der Nähe des Dorfes Simplon); erste Nachweise in diesem Gebiet: Bicknell 1892, E. Cornaz 1893; Plateau von AIpien, mehrfach (Thommen, Becherer); Seehorn (Arnold, Becherer); in allen diesen Gebieten in starker Verbreitung; auf den Alpen von Gondo auch auf italienischem Gebiet (Val Divedro). Vgl. Becherer l. c., S. 224-226, 227 (hier nähere Angaben über die Verbreitung der Art auf der Simplon- Südseite).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Atom-chip gravimeter with Bose-Einstein condensates
Creators: name: Abend, Sven
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Bose-Einstein condensates
subject: matter wave interferometry
subject: gravimetry
subject: Bose-Einstein Kondensate
subject: Materiewelleninterferometrie
subject: Gravimetrie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Optisch-parametrische Verstärkersysteme bei hohen Pulswiederholraten
Creators: name: Ahrens, Jan Thomas
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Ultra-short pulses
subject: optical parametric amplification
subject: fiber amplifier
subject: solid-state amplifier
subject: Ultrakurze Pulse
subject: OPCPA
subject: optisch-parametrischer Verstärker
subject: Faserverstärker
subject: Festkörperverstärker
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Der Totenschild des Wolf Christoph Kress (†1615)
Creators: name: Ehrl, Franziska
Publisher: name: KulturGut : aus der Forschung des Germanischen Nationalmuseums
Year: 2016

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 52 (2017): KulturGut: aus der Forschung des Germanischen Nationalmuseums
Noncommutative Spectral Geometry: A Short Review
Creators: name: Sakellariadou, Mairi
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review the noncommutative spectral geometry, a gravitational model that combines noncommutative geometry with the spectral action principle, in an attempt to unify General Relativity and the Standard Model of electroweak and strong interactions. Despite the phenomenological successes of the model, the discrepancy between the predicted Higgs mass and the current experimental data indicate that one may have to go beyond the simple model considered at first. We review the current status of the phenomenological consequences and their implications. Since this model lives by construction at high energy scales, namely at the Grand Unified Theories scale, it provides a natural framework to investigate early universe cosmology. We briefly review some of its cosmological consequences.
description: 11 pages. Invited talk in the Sixth International Workshop DICE2012, Castello Pasquini/Castiglioncello (Tuscany), September 17-21, 2012
Synthese und Konformationsanalysen und biologische Bewertung von neuen desmethylierten Carolacton-Derivaten
Creators: name: Meyer, Janina
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: total synthesis
subject: carolacton
subject: derivative
subject: biofilm
subject: anti-cancer therapy
subject: Totalsynthese
subject: Carolacton
subject: Derivat
subject: Biofilm
subject: Krebstherapie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: 1998 wurde Carolacton, ein Sekundärmetabolit des Myxobakteriums Sorangium cellulosum (So ce960), am Helmholtz Zentrum für Infektionsforschung in Braunschweig entdeckt und isoliert. Carolacton zeichnet sich durch seine einzigartige Fähigkeit aus, Biofilme des Karies- und Endokarditis-assoziierten Bakteriums Streptococcus mutans bereits in nanomolaren Konzentrationen zu inhibieren. Darüber hinaus hemmt Carolacton das Enzym MTHFD, welches am verstärkten Folat-Stoffwechsel in Krebszellen beteiligt ist. Das macht Carolacton - neben der Eigenschaft als Biofilm Inhibitor - als potenzielles Antikrebsmittel interessant. Die Struktur von Carolacton zeichnet sich durch ein polyketidisches Kohlenstoffgerüst aus, welches einen 12-gliedrigen Makrozyklus ausbildet und über acht stereogene Zentren verfügt. Darüber hinaus enthält es fünf Methylgruppen, ein Merkmal, das in Polyketiden weit verbreitet ist. Im Verlauf dieser Arbeit wurden desmethylierte Carolacton-Derivate synthetisiert, um den Einfluss der Methylgruppen auf die globale Konformation solcher Makrolactone herauszustellen und diese Daten anschließend mit der biologischen Aktivität zu verknüpfen. Der Schwerpunkt lag auf der Synthese desmethylierter Ostfragmente, um diese, basierend auf der von T. Schmidt im Jahre 2012 entwickelten, konvergenten Totalsynthese von Carolacton, mit verschiedenen Westfragmenten zu kuppeln. Die Schlüsselschritte umfassten eine diastereoselektive Paterson-Aldolreaktion, eine Seyferth Gilbert-Homologisierung, eine Mitsunobu-Reaktion und eine modifizierte Takai-Olefinierung. Die Fragmentkupplung wurde durch eine Titan-vermittelte, regioselektive C-C-Bindungsknüpfung erreicht.
Funktionalisierung von Oberflächen und Hyaluronsäure-basierte Hydrogele für die Anwendung in der regenerativen Medizin
Creators: name: Möller, Lena
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Oxygenator-hyaluronic acid
subject: tissue engineering
subject: magnetic-drug-targeting
subject: plasma chemistry
subject: Oxygenator-Hyaluronsäure
subject: Plasmachemie
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Chirale Pincer-Liganden auf Kohlenhydratbasis
Creators: name: Lehnert, Tobias Benjamin Felix
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Carbohydrates
subject: Pincer-complexes
subject: chiral ligands
subject: click-chemistry
subject: asymmetric synthesis
subject: phenyl-bis(oxazolines)
subject: Kohlenhydrate
subject: Pincer-Komplexe
subject: chirale Liganden
subject: Click-Chemie
subject: asymmetrische Synthese
subject: Phenyl-Bis(oxazoline)
subject: Phebox
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Modellierung, Optimierung und Vermessen von HF-RFID-Transpondern unter Berücksichtigung nichtlinearer Effekte
Creators: name: Lin, Wei
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Loop antenna
subject: nonlinearity
subject: RFID-Transponder
subject: Schleifenantenne
subject: Nichtlinearität
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: [no abstract]
Low-temperature metastable states in a stacked triangular Ising antiferromagnet
Creators: name: Žukovič, M.
name: Mižišin, L.
name: Bobák, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study low-temperature magnetization processes in a stacked triangular Ising antiferromagnet by Monte Carlo simulations. In increasing and decreasing magnetic fields we observe multiple steps and hysteresis corresponding to formation of different metastable states. Besides the equidistant threefold splitting of the 1/3 ferrimagnetic plateau, we additionally confirm a fourth plateau in the field-increasing branch and a sizable remanence when the field is decreased to zero. The newly observed plateau only appears at sufficiently low temperature and sufficiently large exchange interaction in the stacking direction. These observations reasonably reproduce low-temperatures measurements on the spin-chain compound $\rm{Ca}_3\rm{Co}_2\rm{O}_6$.
description: 14 pages, 5 figures
Quantifizierung optischer Systeme für die optische Tomographie
Creators: name: Lorbeer, Raoul-Amadeus
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Optical projection tomography
subject: scanning laser optical tomography
subject: point spread function
subject: numerical wave optics
subject: reconstruction
subject: interpolation
subject: Optische Projektionstomographie
subject: scannende laseroptische Tomographie
subject: Punktspreizfunktion
subject: numerische Wellenoptik
subject: Rekonstruktion
subject: Interpolation
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Andreev bound states and current-phase relations in three-dimensional topological insulators
Creators: name: Snelder, M.
name: Veldhorst, M.
name: Golubov, A. A.
name: Brinkman, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: To guide the search for the Majorana fermion, we theoretically study superconductor/topological/superconductor (S/TI/S) junctions in an experimentally relevant regime. We find that the striking features present in these systems, including the doubled periodicity of the Andreev bound states (ABSs) due to tunneling via Majorana states, can still be present at high electron densities. We show that via the inclusion of magnetic layers, this 4pi periodic ABS can still be observed in three-dimensional topological insulators, where finite angle incidence usually results in the opening of a gap at zero energy and hence results in a 2pi periodic ABS. Furthermore, we study the Josephson junction characteristics and find that the gap size can be controlled and decreased by tuning the magnetization direction and amplitude. These findings pave the way for designing experiments on S/3DTI/S junctions.
Gaps in the GD-1 Star Stream
Creators: name: Carlberg, Raymond G.
name: Grillmair, Carl J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: GD-1 is a long, thin, Milky Way star stream that has readily visible density variations along its length. We quantify the locations, sizes and statistical significance of the density structure, i.e. gaps, using a set of scaled filters. The shapes of the filters are based on the gaps that develop in simulations of dark matter sub-halos crossing a star stream. The high Galactic latitude 8.4 kpc long segment of GD-1 that we examine has 8+/-3 gaps of 99% significance or greater, with the error estimated on the basis of tests of the gap-filtering technique. The cumulative distribution of gaps more than 3 times the width of the stream is in good agreement with predictions for dark matter sub-halo encounters with cold star streams. The number of gaps narrower than 3 times the width of the GD-1 stream falls well below the cold stream prediction which is taken into account for the gap creation rate integrated over all sizes. Simple warm stream simulations scaled to GD-1 show that the falloff in gaps is expected for sub-halos below a mass of 10^6 M_sun. The GD-1 gaps requires 100 sub-halos >10^6 M_sun within 30 kpc, the apocenter of GD-1 orbit. These results are consistent with LCDM sub-halo predictions but further improvements in stream signal-to-noise and gap modeling will be welcome.
description: Ap. J. submitted after revisions
Euphrasia ericetorum
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: E. ericetorum Jordan (E. stricta Host) Cat. 281. l: Vernayaz-Salvan (J.); Salvan und Umgebung (J., Coquoz, Favarger); Les Marques bei Martigny (J.). - 3: Glacierdu Trient (Favarger);Gr. St. Bernhard (Wilczek); ob Chippis (F.); Saas- Fee (Hirschmann); Visperterminen (Melly). - 3a: Gabi (Binz, Kilcher und Becherer); Gondo (Becherer). - 4: Deisch (Jaquet); Ulrichen (Favrat); Oberwald (idem).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Robustness of the Berezinskii-Kosterlitz-Thouless Transition in Ultrathin NbN Films near the Superconductor-Insulator Transition
Creators: name: Yong, Jie
name: Lemberger, T.
name: Benfatto, L.
name: Ilin, K.
name: Siegel, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Occurrence of the Berezinskii-Kosterlitz-Thouless (BKT) transition is investigated by superfluid density measurements for two-dimensional (2D) disordered NbN films with disorder level very close to a superconductor-insulator transition (SIT). Our data show a robust BKT transition even near this 2D disorder-tuned quantum critical point (QCP). This observation is in direct contrast with previous data on deeply underdoped quasi-2D cuprates near the SIT. As our NbN films approach the QCP, the vortex-core energy, an important energy scale in the BKT transition, scales with the superconducting gap, not with the superfluid density, as expected within the standard 2D-XY model description of BKT physics.
description: 8 pages, 6 figures
Regionalplanung als integrative Schlüsselfunktion bei der strategischen Anpassung an den Klimawandel in Niedersachsen
Creators: name: Franck, Enke
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Regional planning
subject: climate change
subject: Lower Saxony
subject: Regionalplanung
subject: Klimawandel
subject: Niedersachsen
subject: Dewey Decimal Classification::700 | Künste, Bildende Kunst allgemein::710 | Landschaftsgestaltung, Raumplanung

description: [no abstract]
Superdeformation and alpha - cluster structure in 35Cl
Creators: name: Bisoi, Abhijit
name: Sarkar, M. Saha
name: Sarkar, S.
name: Ray, S.
name: Basu, M. Roy
name: Kanjilal, Debasmita
name: Nag, Somnath
name: Kumar, K. Selva
name: Goswami, A.
name: Madhavan, N.
name: Muralithar, S.
name: Bhowmik, R. K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A superdeformed (SD) band has been identified in a non - alpha - conjugate nucleus 35Cl. It crosses the negative parity ground band above 11/2- and becomes the yrast at 15/2-. Lifetimes of all relevant states have been measured to follow the evolution of collectivity. Enhanced B(E2), B(E1) values as well as energetics provide evidences for superdeformation and existence of parity doublet cluster structure in an odd-A nucleus for the first time in A = 40 region. Large scale shell model calculations assign (sd)16(pf)3 as the origin of these states. Calculated spectroscopic factors correlate the SD states in 35Cl to those in 36Ar.
description: 5 pages, 5 figures
Properties of Diffuse Interstellar Bands at Different Physical Conditions of the ISM
Creators: name: Kos, J.
name: Zwitter, T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Diffuse interstellar bands (DIBs) can trace different conditions of the ISM along the sightline toward the observed stars. A small survey was made in optical wavelengths, producing high resolution and high signal to noise spectra. We present measurements of 19 DIBs' properties in 50 sightlines towards hot stars, distributed at a variety of galactic coordinates and interstellar reddening. Equivalent widths were obtained by fitting asymmetric Gaussian and variable continuum to DIBs. Conditions of the ISM were calculated from 8 atomic and molecular interstellar lines. Two distinctively different types of DIBs were identified, by carefully comparing correlation coefficients between DIBs and reddening and by different behaviour in UV shielded ($ζ$) and non-shielded ($σ$) sightlines. A ratio of DIBs at 5780 Å and~5797 Å proved to be reliable enough to distinguish between two different sightline types. Based on linear relations between DIB equivalent width and reddening for $σ$ and $ζ$ sightlines, we divide DIBs into type {\sc i} (where both linear relations are similar) and type {\sc ii} (where they are significantly different). Linear relation for $ζ$ type sightlines always show a higher slope and larger x-intercept parameter than the relation for $σ$ sightlines. Scatter around the linear relation is reduced after the separation, but it does not vanish completely. This means that UV shielding is the dominant factor of the DIB equivalent width vs.\ reddening relation shape for $ζ$ sightlines, but in $σ$ sightlines other physical parameters play a major role. No similar dependency on gas density, electron density or turbulence was observed. A catalog of all observed interstellar lines is made public.
description: 19 pages, 13 figures, accepted to ApJ
Das quasistationäre Stefan-Problem mit variablen Relaxationskoeffizienten
Creators: name: Lukarevski, Martin
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: oblique derivative problem
subject: free boundary problem
subject: Stefan-Problem
subject: freies Randwertproblem
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: [no abstract]
A precise and accurate determination of the cosmic microwave background temperature at z=0.89
Creators: name: Muller, S.
name: Beelen, A.
name: Black, J. H.
name: Curran, S. J.
name: Horellou, C.
name: Aalto, S.
name: Combes, F.
name: Guelin, M.
name: Henkel, C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: According to the Big Bang theory and as a consequence of adiabatic expansion of the Universe, the temperature of the cosmic microwave background (CMB) increases linearly with redshift. This relation is, however, poorly explored, and detection of any deviation would directly lead to (astro-)physics beyond the standard model. We aim at measuring the temperature of the CMB with an accuracy of a few percent at z=0.89 toward the molecular absorber in the galaxy lensing the quasar PKS1830-211. We adopt a Monte-Carlo Markov Chain approach, coupled with predictions from the non-LTE radiative transfer code RADEX, to solve the excitation of a set of various molecular species directly from their spectra. We determine Tcmb=5.08 pm 0.10 K at 68% confidence level. Our measurement is consistent with the value Tcmb=5.14 K predicted by the standard cosmological model with adiabatic expansion of the Universe. This is the most precise determination of Tcmb at z>0 to date.
description: Accepted for publication in A&A
Anmerkungen zu der Reliquienbüste Karls des Großen im Domschatz zu Aachen
Creators: name: Hilger, Hans Peter
Publisher: name: Aachener Kunstblätter
Year: 2017

description: -
description: Aachener Kunstblätter, Bd. 48 (1978-1979): Aachener Kunstblätter
Alte Kunst im Spiegel moderner Lyrik
Creators: name: Grimme-Welsch, Gisela
Publisher: name: Aachener Kunstblätter
Year: 2017

description: Rezension zu Scharpenberg, Margot: Bildgespräche in Aachen. 25 Gedichte zu mittelalterlichen Skulpturen des Suermondt-Ludwig-Museums, Aachen. Mit einem Vorwort von Ernst Günther Grimme sowie Sachkommentaren und einem Autorenporträt von Gisela Grimme-Welsch. Mit Abb. Duisburg: Gilles&Erancke 1978.
description: Aachener Kunstblätter, Bd. 48 (1978-1979): Aachener Kunstblätter
Model-based discrete relaxation process representation of band-limited power-law attenuation
Creators: name: Nasholm, Sven Peter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Frequency-dependent acoustical loss due to a multitude of physical mechanisms is commonly modeled by multiple relaxations. For discrete relaxation distributions, such models correspond with causal wave equations of integer-order temporal derivatives. It has also been shown that certain continuous distributions may give causal wave equations with fractional-order temporal derivatives. This paper demonstrates analytically that if the wave-frequency ω satisfies Ω_L << ω << Ω_H, a continuous relaxation distribution populating only Ω belongs to [Ω_L,Ω_H] gives the same effective wave equation as for a fully populated distribution. This insight sparks the main contribution: the elaboration of a method to determine discrete relaxation parameters intended for mimicking a desired attenuation behavior for band-limited waves. In particular, power-law attenuation is discussed as motivated by its prevalence in complex media, e.g. biological tissue. A Mittag-Leffler function related distribution of relaxation mechanisms has previously been shown to be related to the fractional Zener wave equation of three power-law attenuation regimes. Because these regimes correspond to power-law regimes in the relaxation distribution, the idea is to sample the distribution's compressibility contributions evenly in logarithmic frequency while appropriately taking the stepsize into account. This work thence claims to provide a model-based approach to determination of discrete relaxation parameters intended to adequately model attenuation power-laws.
description: 9 pages. The peer-reviewed version of this paper is accepted for publishing. It is scheduled for Vol. 133, No 3 (March 2013) of The Journal of the Acoustical Society of America. DOI: 10.1121/1.4789001 It will be available online at http://asadl.org/jasa/ The current document is an e-print which differs in e.g. pagination and typographic detail
Spindynamik in GaAs und (110)-GaAs-Heterostrukturen
Creators: name: Oertel, Stefan
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Semiconductor
subject: electron spin
subject: spin relaxation
subject: Halbleiter
subject: Elektronenspin
subject: Spinrelaxation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Rule Formats for Nominal Process Calculi
Creators: name: Aceto, Luca
name: Fábregas, Ignacio
name: García-Pérez, Álvaro
name: Ingólfsdóttir, Anna
name: Ortega-Mallén, Yolanda
Publisher: name: arXiv
Year: 2024
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: The nominal transition systems (NTSs) of Parrow et al. describe the operational semantics of nominal process calculi. We study NTSs in terms of the nominal residual transition systems (NRTSs) that we introduce. We provide rule formats for the specifications of NRTSs that ensure that the associated NRTS is an NTS and apply them to the operational specification of the early pi-calculus. Our study stems from the recent Nominal SOS of Cimini et al. and from earlier works in nominal sets and nominal logic by Gabbay, Pitts and their collaborators.
description: Conference version of arXiv:1807.02081
Modifikation automobiler Produktmarken zur Strukturierung von Sonderausstattungen : ein markenorientierter Ansatz zur Gestaltung der Produktstruktur
Creators: name: Beck, Christian
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Price differentiation
subject: brand extension
subject: assortment policy
subject: Preisdifferenzierung
subject: Markendehnung
subject: Programmpolitik
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: [no abstract]
Measurement of the isotopic composition of hydrogen and helium nuclei in cosmic rays with the PAMELA experiment
Creators: name: Adriani, O.
name: Barbarino, G. C.
name: Bazilevskaya, G. A.
name: Bellotti, R.
name: Boezio, M.
name: Bogomolov, E. A.
name: Bongi, M.
name: Bonvicini, V.
name: Borisov, S.
name: Bottai, S.
name: Bruno, A.
name: Cafagna, F.
name: Campana, D.
name: Carbone, R.
name: Carlson, P.
name: Casolino, M.
name: Castellini, G.
name: Danilchenko, I. A.
name: De Pascale, M. P.
name: De Santis, C.
name: De Simone, N.
name: Di Felice, V.
name: Formato, V.
name: Galper, A. M.
name: Karelin, A. V.
name: Koldashov, S. V.
name: Koldobskiy, S.
name: Krutkov, S. Y.
name: Kvashnin, A. N.
name: Leonov, A.
name: Malakhov, V.
name: Marcelli, L.
name: Mayorov, A. G.
name: Menn, W.
name: Mikhailov, V. V.
name: Mocchiutti, E.
name: Monaco, A.
name: Mori, N.
name: Nikonov, N.
name: Osteria, G.
name: Palma, F.
name: Papini, P.
name: Pearce, M.
name: Picozza, P.
name: Pizzolotto, C.
name: Ricci, M.
name: Ricciarini, S. B.
name: Rossetto, L.
name: Sarkar, R.
name: Simon, M.
name: Sparvoli, R.
name: Spillantini, P.
name: Stozhkov, Y. I.
name: Vacchi, A.
name: Vannuccini, E.
name: Vasilyev, G.
name: Voronov, S. A.
name: Yurkin, Y. T.
name: Wu, J.
name: Zampa, G.
name: Zampa, N.
name: Zverev, V. G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The satellite-borne experiment PAMELA has been used to make new measurements of cosmic ray H and He isotopes. The isotopic composition was measured between 100 and 600 MeV/n for hydrogen and between 100 and 900 MeV/n for helium isotopes over the 23rd solar minimum from July 2006 to December 2007. The energy spectrum of these components carries fundamental information regarding the propagation of cosmic rays in the galaxy which are competitive with those obtained from other secondary to primary measurements such as B/C.
description: 11 pages, 11 figures, 5 tables. To appear in Astrophysical Journal
Modelle für die Wachstumsraten von Chlorella vulgaris bei unterschiedlichen Photonenabsorptionsraten und Lichtspektren
Creators: name: Bialon, Johannes Josef
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Microalgae
subject: growth rates
subject: light spectra
subject: Mikroalgen
subject: Wachstumsraten
subject: Lichtspektren
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Sparse Grids for quantifying motion uncertainties in biomechanical models of radiotherapy patients
Creators: name: Song, Chen
name: Stoll, Markus
name: Giske, Kristina
name: Bendl, Rolf
name: Heuveline, Vincent
Publisher: name: Heidelberg University, Interdisciplinary Center for Scientific Computing (IWR)
Year: 2017
Subjects: Uncertainty Quantification; Stochastic Collocation; Sparse Grids; Biomechanical Modeling; Radiotherapy

description: Quantifying the uncertainties in biomedical simulations has strong potential in medical software systems. It allows us to improve objective confidence levels for numerical predictions. The Stochastic Collocation (SC) method is a promising way to create the link between existing simulation codes and advanced Uncertainty Quantification (UQ) methods, as it does not require modifying the original source code and meanwhile has better convergence rate comparing with traditional stochastic approaches. We describe the implementation of the Stochastic Collocation method with an adaptive sparse grid numerical integration, and apply it in the context of radiotherapy treatment planning of patients with head and neck cancer. In this case, the statistical sampling of most probable postures of patient specific anatomy of the neck region is used to estimate deformations of the tumor region in order to find a suitable safety margin around target volumes.
Especially, in highly flexible body areas, like the neck and upper thorax regions, the number of degrees of freedom of motion patterns can be quite large. The fast and stable prediction of most probable motion patterns, derived from previous cohorts, influences the ability to incorporate uncertainties caused by motion into the treatment planning process. The optimal number of samples not only reduces the number of simulations needed to generate an individually fitted internal target volume as a starting point for a standardized planning target volume, but also promises to minimize computational demands in robust planning scenarios, where plans are challenged by different possible motion scenarios.
description: Preprint Series of the Engineering Mathematics and Computing Lab, No 01 (2017): Sparse Grids for quantifying motion uncertainties in biomechanical models of radiotherapy patients