cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dirac eigenspinors for generic metrics
Creators: name: Hermann, Andreas
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: Spin geometry, Dirac operators, spectrum, eigenspinors
subject: 510 Mathematik

description: We consider a Riemannian spin manifold (M, g) with a fixed spin structure. The zero sets of solutions of generalized Dirac equations on M play an important role in some questions arising in conformal spin geometry and in mathematical physics. In this setting the mass endomorphism has been defined as the constant term in an expansion of Green's function for the Dirac operator. One is interested in obtaining metrics, for which it is not zero. In this thesis we study the dependence of the zero sets of eigenspinors of the Dirac operator on the Riemannian metric. We prove that on closed spin manifolds of dimension 2 or 3 for a generic Riemannian metric the nonharmonic eigenspinors have no zeros. Furthermore we prove that on closed spin manifolds of dimension 3 the mass endomorphism is not zero for a generic Riemannian metric.
A spectral scheme for Kohn-Sham density functional theory of clusters
Creators: name: Banerjee, Amartya S.
name: Elliott, Ryan S.
name: James, Richard D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Starting from the observation that one of the most successful methods for solving the Kohn-Sham equations for periodic systems -- the plane-wave method -- is a spectral method based on eigenfunction expansion, we formulate a spectral method designed towards solving the Kohn-Sham equations for clusters. This allows for efficient calculation of the electronic structure of clusters (and molecules) with high accuracy and systematic convergence properties without the need for any artificial periodicity. The basis functions in this method form a complete orthonormal set and are expressible in terms of spherical harmonics and spherical Bessel functions. Computation of the occupied eigenstates of the discretized Kohn-Sham Hamiltonian is carried out using a combination of preconditioned block eigensolvers and Chebyshev polynomial filter accelerated subspace iterations. Several algorithmic and computational aspects of the method, including computation of the electrostatics terms and parallelization are discussed. We have implemented these methods and algorithms into an efficient and reliable package called ClusterES (Cluster Electronic Structure). A variety of benchmark calculations employing local and non-local pseudopotentials are carried out using our package and the results are compared to the literature. Convergence properties of the basis set are discussed through numerical examples. Computations involving large systems that contain thousands of electrons are demonstrated to highlight the efficacy of our methodology. The use of our method to study clusters with arbitrary point group symmetries is briefly discussed.
description: Manuscript submitted (with revisions) to Journal of Computational Physics
Secondary CMB anisotropies from bulk motions in the presence of stochastic magnetic fields
Creators: name: Kunze, Kerstin E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Bulk motions of electrons along the line of sight induce secondary temperature fluctuations in the post-decoupling, reionized universe. In the presence of a magnetic field not only the scalar mode but also the vector mode act as a source for the bulk motion. The resulting angular power spectrum of temperature anisotropies of the cosmic microwave background is calculated assuming a simple model of reionization.Contributions from the standard adiabatic, curvature mode and a non helical magnetic field are included. The contribution due to magnetic fields with field strengths of order nG and negative magnetic spectral indices becomes important for multipoles larger than $\ell \sim 10^4$.
description: 14 pages, 3 figures; matches version published in PRD
Magnetization dynamics: path-integral formalism for the stochastic Landau-Lifshitz-Gilbert equation
Creators: name: Aron, Camille
name: Barci, Daniel G.
name: Cugliandolo, Leticia F.
name: Arenas, Zochil Gonzalez
name: Lozano, Gustavo S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We construct a path-integral representation of the generating functional for the dissipative dynamics of a classical magnetic moment as described by the stochastic generalization of the Landau-Lifshitz-Gilbert equation proposed by Brown, with the possible addition of spin-torque terms. In the process of constructing this functional in the Cartesian coordinate system, we critically revisit this stochastic equation. We present it in a form that accommodates for any discretization scheme thanks to the inclusion of a drift term. The generalized equation ensures the conservation of the magnetization modulus and the approach to the Gibbs-Boltzmann equilibrium in the absence of non-potential and time-dependent forces. The drift term vanishes only if the mid-point Stratonovich prescription is used. We next reset the problem in the more natural spherical coordinate system. We show that the noise transforms non-trivially to spherical coordinates acquiring a non-vanishing mean value in this coordinate system, a fact that has been often overlooked in the literature. We next construct the generating functional formalism in this system of coordinates for any discretization prescription. The functional formalism in Cartesian or spherical coordinates should serve as a starting point to study different aspects of the out-of-equilibrium dynamics of magnets. Extensions to colored noise, micro-magnetism and disordered problems are straightforward.
description: 47 pages + appendix, published version
Electroluminescence and photocurrent generation from atomically sharp WSe2/MoS2 heterojunction p-n diodes
Creators: name: Cheng, Rui
name: Li, Dehui
name: Zhou, Hailong
name: Wang, Chen
name: Yin, Anxiang
name: Jiang, Shan
name: Liu, Yuan
name: Chen, Yu
name: Huang, Yu
name: Duan, Xiangfeng
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The p-n diodes represent the most fundamental device building block for diverse optoelectronic functions, but are difficult to achieve in atomically thin transition metal dichalcogenides (TMDs) due to the inability to selectively dope them into p- or n-type semiconductors. Here we report the first demonstration of an atomically thin and atomically sharp heterojunction p-n diode by vertically stacking p-type monolayer tungsten diselenide (WSe2) and n-type few-layer molybdenum disulfide (MoS2). Electrical measurement demonstrates excellent diode characteristics with well-defined current rectification behaviour and an ideality factor of 1.2. Photocurrent mapping shows fast photoresponse over the entire overlapping region with a highest external quantum efficiency up to 12 %. Electroluminescence studies show prominent band edge excitonic emission and strikingly enhanced hot electron luminescence. A systematic investigation shows distinct layer-number dependent emission characteristics and reveals important insight about the origin of hot-electron luminescence and the nature of electron-orbital interaction in TMDs. We believe that these atomically thin heterojunction p-n diodes represent an interesting system for probing the fundamental electro-optical properties in TMDs, and can open up a new pathway to novel optoelectronic devices such as atomically thin photodetectors, photovoltaics, as well as spin-/valley-polarized light emitting diodes and on-chip lasers.
description: 27 pages, 7 figures
Relativistic viscous hydrodynamics for heavy-ion collisions: A comparison between the Chapman-Enskog and Grad methods
Creators: name: Bhalerao, Rajeev S.
name: Jaiswal, Amaresh
name: Pal, Subrata
name: Sreekanth, V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Derivations of relativistic second-order dissipative hydrodynamic equations have relied almost exclusively on the use of Grad's 14-moment approximation to write $f(x,p)$, the nonequilibrium distribution function in the phase space. Here we consider an alternative Chapman-Enskog-like method, which, unlike Grad's, involves a small expansion parameter. We derive an expression for $f(x,p)$ to second order in this parameter. We show analytically that while Grad's method leads to the violation of the experimentally observed $1/\sqrt{m_T}$ scaling of the longitudinal femtoscopic radii, the alternative method does not exhibit such an unphysical behavior. We compare numerical results for hadron transverse-momentum spectra and femtoscopic radii obtained in these two methods, within the one-dimensional scaling expansion scenario. Moreover, we demonstrate a rapid convergence of the Chapman-Enskog-like expansion up to second order. This leads to an expression for $δf(x,p)$ which provides a better alternative to Grad's approximation for hydrodynamic modeling of relativistic heavy-ion collisions.
description: 9 pages, 2 figs. Version 2: same as the published version. Appendix A expanded
Many-body mobility edge in a mean-field quantum spin glass
Creators: name: Laumann, C. R.
name: Pal, A.
name: Scardicchio, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The quantum random energy model provides a mean-field description of the equilibrium spin glass transition. We show that it further exhibits a many-body localization - delocalization (MBLD) transition when viewed as a closed quantum system. The mean-field structure of the model allows an analytically tractable description of the MBLD transition using the forward-scattering approximation and replica techniques. The predictions are in good agreement with the numerics. The MBLD lies at energy density significantly above the equilibrium spin glass transition, indicating that the closed system dynamics freezes well outside of the traditional glass phase. We also observe that the structure of the eigenstates at the MBLD critical point changes continuously with the energy density, raising the possibility of a family of critical theories for the MBLD transition.
description: 8 pages, 5 figures
Brief Jo[anni] Meyero
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1597

description: von Jo[hann] Jac[obus vom] Staal
description: Brief Nr. 244.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Mai 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Minimizing insider misuse through secure Identity Management
Creators: name: Fuchs, Ludwig
name: Pernul, Günther
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: 004 Informatik

description: To avoid insider computer misuse, identity, and authorization data referring to the legitimate users of systems must be properly organized, constantly and systematically analyzed, and evaluated. In order to support this, structured and secure Identity Management is required. A comprehensive methodology supporting Identity Management within organizations has been developed, including gathering of identity data spread among different applications, systematic cleansing of user account data in order to detect semantic as well as syntactic errors, grouping of privileges and access rights, and semiautomatic engineering of user roles. The focus of this paper is on the cleansing of identity and account data leading to feedback where insider misuse due to existing privileges which go beyond the scope of the users' current need-to-know may occur. The paper in detail presents used data cleansing mechanisms and underlines their applicability in two real-world case studies.
description: Article first published online: 25 FEB 2011
Brief J[oanni] Marquisio
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1597

description: von [Hans Jakob vom Staal]
description: Brief Nr. 241.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Brief an [Claude de la Pierre] und an [Charles de Rochette]
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1603

description: von [Hans Jakob vom Staal]
description: Brief Nr. 237 = Nr. 387.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Brief Anthonio à Mantenac
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1594

description: von [Hans Jakob vom Staal]
description: Brief Nr. 251, auf der Rückseite befindet sich Nr. 249.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Concordance and complementarity in Intellectual Property instruments
Creators: name: Grazzi, Marco
name: Piccardo, Chiara
name: Vergari, Cecilia
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2019
Subjects: SECS-P/02 Politica economica

description: This work investigates the relationship between proxies of innovation activities, such as patents and trademarks, and firm performance in terms of revenues and growth. By resorting to the virtual universe of Italian manufacturing firms we provide a rather complete picture of the innovation activities of Italian firms, in terms of patents and trademarks, and we study whether the two instruments for protecting Intellectual Property (IP) exhibit complementarity or substitutability. In addition, and to our knowledge novel, we propose a measure of concordance (or proximity) between the patents and trademarks owned by the same firm and we then investigate whether such concordance appears to exert any effect on performance.
Brief Martio Licio
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1603

description: von [Hans Jakob vom Staal]
description: Brief Nr. 234.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Tracker Meets Night: A Transformer Enhancer for UAV Tracking
Creators: name: Ye, Junjie
name: Fu, Changhong
name: Cao, Ziang
name: An, Shan
name: Zheng, Guangze
name: Li, Bowen
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Most previous progress in object tracking is realized in daytime scenes with favorable illumination. State-of-the-arts can hardly carry on their superiority at night so far, thereby considerably blocking the broadening of visual tracking-related unmanned aerial vehicle (UAV) applications. To realize reliable UAV tracking at night, a spatial-channel Transformer-based low-light enhancer (namely SCT), which is trained in a novel task-inspired manner, is proposed and plugged prior to tracking approaches. To achieve semantic-level low-light enhancement targeting the high-level task, the novel spatial-channel attention module is proposed to model global information while preserving local context. In the enhancement process, SCT denoises and illuminates nighttime images simultaneously through a robust non-linear curve projection. Moreover, to provide a comprehensive evaluation, we construct a challenging nighttime tracking benchmark, namely DarkTrack2021, which contains 110 challenging sequences with over 100 K frames in total. Evaluations on both the public UAVDark135 benchmark and the newly constructed DarkTrack2021 benchmark show that the task-inspired design enables SCT with significant performance gains for nighttime UAV tracking compared with other top-ranked low-light enhancers. Real-world tests on a typical UAV platform further verify the practicability of the proposed approach. The DarkTrack2021 benchmark and the code of the proposed approach are publicly available at https://github.com/vision4robotics/SCT.
Brief Joachimo Megelino
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1611

description: von Jo[hann] Ja[cobus vom] Staal
description: Brief Nr. 242.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Detection and Localisation of Multiple In-Core Perturbations with Neutron Noise-Based Self-Supervised Domain Adaptation
Creators: name: Durrant, Aiden
name: Leontidis, Georgios
name: Kollias, Stefanos
name: Torres, Luis
name: Montalvo, Cristina
name: Mylonakis, Antonios
name: Demazière, Christophe
name: Vinai, Paolo
Publisher: name: Zenodo
Year: 2021

description: Problem Case
 • We aim to unfold reactor transfer function to provide core
 diagnostics.
 • Derivation of core perturbation characteristics to classify and locate its
 origin.
 • Yet this is challenging due to the limited number of neutron
 detectors in western type reactors.
 • We ask, can we use machine learning to successfully approximate the
 reactor transfer function?
 • However, to effectively train ML algorithms large quantities of
 data are required.
Usefulness of an enhanced Kitaev phase-estimation algorithm in quantum metrology and computation
Creators: name: Kaftal, Tomasz
name: Demkowicz-Dobrzanski, Rafal
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the performance of a generalized Kitaev's phase estimation algorithm where N phase gates, acting on $M$ qubits prepared in a product state, may be distributed in an arbitrary way. Unlike the standard algorithm, where the mean square error scales as 1/N, the optimal generalizations offer the Heisenberg $1/N^2$ error scaling and we show that they are in fact very close to the fundamental Bayesian estimation bound. We also demonstrate that the optimality of the algorithm breaks down when losses are taken into account, in which case the performance is inferior to the optimal entanglement-based estimation strategies. Finally, we show that when an alternative resource quantification is adopted, which describes the phase estimation in Shor's algorithm more accurately, the standard Kitaev's procedure is indeed optimal and there is no need to consider its generalized version.
description: 8 pages, 3 figures
Estudio comparativo del ruido neutrónico mediante el uso del código neutrónico PARCS y del simulador de ruido neutrónico CORE SIM
Creators: name: Olmo-Juan, Nicolás
name: Barrachina, Teresa
name: Miró, Rafael
name: Verdú, Gumersindo
name: Demazière, Christophe
Publisher: name: Zenodo
Year: 2018
Subjects: CORE SIM, neutron noise, simulation

description: Presentation at the 44th Annual Meeting of the Spanish Nuclear Society in Ávila, Castilla y León, Spain.
Brief Anthonio Orzalæo
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1599

description: von [Hans Jakob vom Staal]
description: Brief Nr. 255.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Brief an [Martin Licius]
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1603

description: von Io[annes] Iacobus â Staal
description: Brief Nr. 235.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Water stress and Water Vulnerability indicators and maps
Creators: name: Snethlage, Judit
name: De Miguel, Angel
name: Daniels, Emma
name: Froebrich, Jochen
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2018
Subjects: ING-IND/25 Impianti chimici

description: This report is related to the MADFORWATER Task 1.2 "Analysis and mapping of Water Stress, Water Vulnerability and potential for water reuse in Egypt, Morocco and Tunisia". The aim of this study is to provide a basis for assessing measures that can improve the agricultural water productivity with a special focus on increasing the re-use of wastewater in agriculture.
Brief Johanni Michaeli
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1592

description: von Jo[hann] Jac[obus vom] Staal
description: Brief Nr. 248.
description: Mit Siegel.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Explanation of hadron transverse-momentum spectra in heavy-ion collisions at sqrt(sNN) = 2.76 TeV within chemical non-equilibrium statistical hadronization model
Creators: name: Begun, Viktor
name: Florkowski, Wojciech
name: Rybczynski, Maciej
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Chemical non-equilibrium version of the statistical hadronization model combined with a single-freeze-out scenario is used to analyze the transverse-momentum spectra of pions, kaons and protons produced in heavy-ion collisions at sqrt(sNN) = 2.76 TeV. With the statistical parameters found in earlier studies of hadronic ratios and two new geometric parameters determined by the absolute normalization and slopes of the spectra, we obtain a very good agreement between the data and the model predictions. In particular, the enhancement of pions observed at the very low transverse-momenta is very well reproduced. In the chemical non-equilibrium approach, this effect may be naturally interpreted as the onset of pion condensation in heavy-ion collisions. We further stress that the chemical non-equilibrium explains not only the proton yield but the proton spectra as well.
description: minor corrections, physics interpretation and discussions added
Brief Joanni Müllero
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1599

description: von Jo[hann] Jac[obus vom] Staal
description: Brief Nr. 253, auf der Rückseite und dem zweiten Blatt befindet sich Nr. 346.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
MPTP-induced degeneration: interference with glutamatergic toxicity
Creators: name: Löschmann, P. A.
name: Lange, Klaus W.
name: Wachtel, H.
name: Turski, L.
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: 150 Psychologie
subject: 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine/pharmacology
subject: Animals
subject: Chromatography, High Pressure Liquid
subject: Dopamine/metabolism
subject: Glutamic Acid/poisoning
subject: Male
subject: Mice
subject: Mice, Inbred C57BL
subject: Nerve Degeneration
subject: Piperazines/pharmacology
subject: Receptors, N-Methyl-D-Aspartate/antagonists & inhibitors
subject: Serotonin/metabolism

description: Parkinson's disease (PD) is characterised by the progressive degeneration of nigrostriatal dopamine (DA) neurons resulting in the major symptoms of akinesia and rigidity. Although the primary cause of PD is still not known some features make this disorder a model for neurodegenerative diseases in general. It has been known for some time that symptomatic PD can be attributed to insults with symptoms occurring many years later such as post-encephalitic PD or PD following manganese poisoning. More recently, MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine) has been identified as a neurotoxin selective for melanin-containing dopaminergic neurons in humans and non-human primates. The specificity of this neurotoxin and the striking clinical similarities to idiopathic PD, seen in primates, make MPTP-induced parkinsonism the most useful animal model of a neurological disease. There are numerous theoretical possibilities to interfere with both MPTP-induced neurotoxicity and the symptomatology of PD. In recent years excitatory amino acids have gained considerable interest since they can cause excitotoxic lesion of neurons under a number of pathological conditions (Olney et al., 1989; Choi, 1988). Here we summarise the present data and provide new experimental evidence indicating that MPTP-induced degeneration of dopaminergic neurons does involve glutamate-mediated toxicity. It is concluded that glutamate-mediated excitotoxicity results in the destruction of DAergic somata in the substantia nigra. Non-competitive or competitive NMDA antagonists protect nigral neurons from MPTP-induced degeneration whereas their striatal terminals still seem to degenerate.
description: Band hat ISBN 3-211-82542-8; Titel: Neuroprotection in neurodegeneration; hg. v. Riederer, Peter
Brief an Marie de Bourbon
Creators: name: Stand Solothurn
name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1599

description: von L'Avoyer et Conseil de la Ville et Canton de Solleure en Suisse und [Hans Jakob vom Staal]
description: Brief Nr. 254.
description: Französisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Brief an Francisco Guilimanno
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1602

description: von [Hans Jakob vom Staal]
description: Brief Nr. 198.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Brief an Francisco Guilimanno
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1597

description: von Jo[hann] Jac[obus vom] Staal
description: Brief Nr. 194.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Velocity Reversal Criterion of a Body Immersed in a Sea of Particles
Creators: name: Chen, Xuwen
name: Strauss, Walter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider a rigid body colliding with a continuum of particles. We assume that the body is moving at a velocity close to an equilibrium velocity V_{\infty} and that the particles colliding with the body reflect diffusely, that is, probabilistically with some probablility distribution K. We find a condition that is sufficient and almost necessary that the collective force of the colliding particles reverses the relative velocity V(t) of the body, that is, changes the sign of V(t)-V_{\infty}, before the body approaches equilibrium. Examples of both reversal and irreversal are given. This is in strong contrast with the pure specular reflection case in which only reversal happens.
description: Revised according to the referee reports. Accepted to appear in Communications in Mathematical Physics
Comment on "Casimir force in the $O(n\to\infty)$ model with free boundary conditions"
Creators: name: Diehl, H. W.
name: Grüneberg, Daniel
name: Hasenbusch, Martin
name: Hucht, Alfred
name: Rutkevich, Sergei B.
name: Schmidt, Felix M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In a recent paper [D. Dantchev, J. Bergnoff, and J. Rudnick, Phys. Rev. E 89, 042116 (2014)] the problem of the Casimir force in the $O(n)$ model on a slab with free boundary conditions, investigated earlier by us [EPL 100, 10004 (2012)], is reconsidered using a mean spherical model with separate constraints for each layer. The authors (i) question the applicability of the Ginzburg-Landau-Wilson approach to the low-temperature regime, arguing for the superiority of their model compared to the family of $ϕ^4$ models A and B whose numerically exact solutions we determined both for values of the coupling constant $0
description: Comment on arXiv:1210.1452, see also arXiv:1402.3510, accepted
Brief Martino Lycio
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1599

description: von Jo[hann] Jac[obus vom] Staal
description: Brief Nr. 228.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Food preferences explain distribution of the two marine gastropods Hydrobia ulvae and Littorina littorea
Creators: name: Achatz, Michaela
name: Seifert, Anja
Publisher: name: Humboldt-Universität zu Berlin
Year: 2021
Subjects: subject: Forschungsstation Kristineberg
subject: Schweden
subject: Gastropoden
subject: marin
subject: Hydrobia ulvae
subject: Littorina littorea
subject: Futterpräferenzen
subject: Quantitative Beobachtungen
subject: Freilandversuche
subject: 570 Biologie

description: Im Rahmen des Meeresbiologischen Praktikums in der Forschungsstation Kristineberg (Schweden) im Sommer 2004 haben wir untersucht, ob die marinen Gastropodenarten Hydrobia ulvae und Littorina littorea Futterpräferenzen aufweisen. In Laborversuchen wurden beiden Arten unterschiedliche Kombinationen der Pflanzen Fucus vesiculosus, Ceramium rubrum und Zostera marina angeboten. H. ulvae zeigte eine deutliche Präferenz für C. rubrum. Bei L. littorea konnte keine Präferenz festgestellt werden. Quantitative Beobachtungen im Freiland ergaben, daß verschiedene Größenklassen von L. littorea unterschiedliche Pflanzen bevorzugen. Adulte L. littorea traten auf F. vesiculosus, und F. serratus auf. Juvenile Exemplare von L. littorea hingegen fanden sich auf Laminaria saccharina, Sargassum muticum, Ceramium rubrum, Enteromorpha flexuosa und Zostera marina.
Brief Thomæ Hendelio
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1592

description: von [Hans Jakob vom Staal]
description: Brief Nr. 203.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Mai 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
The Geometry of Trifocal Curves with Applications in Architecture, Urban and Spatial Planning
Creators: name: Petrovic, Maja
name: Banjac, Bojan
name: Malesevic, Branko
Publisher: name: arXiv
Year: 2013
Subjects: subject: History and Overview (math.HO)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: In this paper we consider historical genesis of trifocal curve as an optimal curve for solving the Fermat's problem (minimizing the sum of distance of one point to three given points in the plane). Trifocal curves are basic plane geometric forms which appear in location problems. We also analyze algebraic equation of these curves and some of their applications in architecture, urbanism and spatial planning. The area and perimeter of trifocal curves are calculated using a Java application. The Java applet is developed for determining numerical value for the Fermat-Torricelli-Weber point and optimal curve with three foci, when starting points are given on an urban map. We also present an application of trifocal curves through the analysis of one specific solution in South Stream gas pipeline project.
description: accepted in SPATIUM International Review, 2014
Brief an [Karl Emanuel I., Herzog von Savoyen]
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1603

description: von [Hans Jakob vom Staal]
description: Brief Nr. 222.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Mai 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Brief Francisco Guilimanno
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1597

description: von [Hans Jakob vom Staal]
description: Brief Nr. 191 bis, auf der dritten und vierten Seite befindet sich Nr. 529.
description: Abschrift von Brief ZBS S I 20/2/191.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Brief [Francisco] Guilimanno
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1596

description: von [Hans Jakob vom Staal]
description: Brief Nr. 188.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Brief Sigismundo Ilsungo
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1598

description: von Jo[hann] Jac[ob vom] Staal
description: Brief Nr. 216.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Mai 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
A reclaimer scheduling problem arising in coal stockyard management
Creators: name: Angelelli, Enrico
name: Kalinowski, Thomas
name: Kapoor, Reena
name: Savelsbergh, Martin W. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: We study a number of variants of an abstract scheduling problem inspired by the scheduling of reclaimers in the stockyard of a coal export terminal. We analyze the complexity of each of the variants, providing complexity proofs for some and polynomial algorithms for others. For one, especially interesting variant, we also develop a constant factor approximation algorithm.
description: 26 pages
Brief Francisco Guilimanno
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1603

description: von [Hans Jakob vom Staal]
description: Brief Nr. 200.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Mai 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Neuroprotection by dopamine agonists
Creators: name: Lange, Klaus W.
name: Rausch, W. D.
name: Gsell, W.
name: Naumann, M.
name: Oestreicher, E.
name: Riederer, P.
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: 150 Psychologie
subject: 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine/pharmacology
subject: Aging/physiology
subject: Animals
subject: Bromocriptine/pharmacology
subject: Dopamine Agonists/therapeutic use
subject: Humans
subject: Neuroprotective Agents/pharmacology
subject: Neurotoxins/pharmacology
subject: Parkinson Disease/pathology
subject: Pergolide/pharmacology

description: Research on Parkinson's disease has led to new hypotheses concerning the mechanisms of neurodegeneration and to the development of neuroprotective agents. Recent findings of impaired mitochondrial function, altered iron metabolism and increased lipid peroxidation in the substantia nigra of parkinsonian patients emphasize the significance of oxidative stress and free radical formation in the pathogenesis of Parkinson's disease. Present research is therefore focussing on improvements in neuroprotective therapy to prevent or slow the rate of progression of the disease. Possible neuroprotective strategies include free radical scavengers, monoamine oxidase-B inhibitors, iron chelators and glutamate antagonists. Recent studies point to the possibility of achieving neuroprotection in ageing and parkinsonism by the administration of dopamine agonists. In the rat, the dopamine agonist pergolide appears to preserve the integrity of nigrostriatal neurones with ageing. The prevention of age-related degeneration may be achieved as a result of a decreased dopamine turnover and reduced conversion of dopamine to toxic compounds. In our own study, bromocriptine treatment prevented the striatal dopamine reduction following MPTP administration in the mouse. These results suggest that the neurotoxic effects of MPTP can be prevented by bromocriptine. Monotherapy with the dopamine agonist lisuride in the early stages of Parkinson's disease delays the need for the initiation of levodopa treatment to a similar extent as has been reported for L-deprenyl. It remains to be shown whether this is due to neuroprotective efficacy of the dopamine agonist or to a direct symptomatic effect.
description: Band hat ISBN 3-211-82542-8; Titel: Neuroprotection in neurodegeneration; hg. v. Riederer, Peter
Optimization strategies for IMRT and VMAT plans in Oncentra using the example of hypopharynx carcinoma and plan verification
Creators: name: Treutwein, Marius
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: IMRT, VMAT, hypopharynx carcinoma
subject: 610 Medizin

description: A presentation showing first optimization strategies for IMRT or VMAT plans of the hypopharynx carcinoma using the therapy planning system Oncentra of the Nucletron/Elekta company. The second part is a short introduction into the plan verification of these plans.
Brief Thomæ Hendelio
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1596

description: von [Hans Jakob vom Staal]
description: Brief Nr. 205.
description: Lateinisch
description: Verzeichnung=Description=Inventaire HAN-Katalogisierungsregeln Mai 2016/August 2022 iho/HBr
Brief an [Fracisco] Guilimanno
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1597

description: von Jo[hann] Jac[obus vom] Staal
description: Brief Nr. 193.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Mai 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
The experience of acquired brain injury in the domestic violence context: A scoping review protocol of qualitative studies
Creators: name: Durrant, Magdalena
name: Theadom, Alice
name: O'Donovan, Claire
name: Koziol-McLain, Jane
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Public Health
subject: Women's Health
subject: Medicine and Health Sciences
subject: Domestic Violence
subject: Family Violence
subject: Battered women
subject: Brain Injury

description: This review will map the extent, nature, and range of qualitative literature with people with experience of possible domestic violence (DV)-related acquired brain injury (ABI) as participants and identify gaps in the existing evidence base.
Motor activity following the administration of selective D-1 and D-2 dopaminergic drugs to MPTP-treated common marmosets
Creators: name: Löschmann, P. A.
name: Smith, L. A.
name: Lange, Klaus W.
name: Jähnig, P.
name: Jenner, P.
name: Marsden, C. D.
Publisher: name: Universität Regensburg
Year: 1992
Subjects: subject: 150 Psychologie
subject: 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine/pharmacology
subject: Animals
subject: Behavior, Animal/drug effects
subject: Callithrix
subject: Dopamine Agents/pharmacology
subject: Dopamine Agonists/pharmacology
subject: Dopamine Antagonists/pharmacology
subject: Dose-Response Relationship, Drug
subject: Female
subject: Male
subject: Motor Activity/drug effects
subject: Receptors, Dopamine D1/drug effects
subject: Receptors, Dopamine D2/drug effects

description: The ability of selective D-1 agonist and antagonist drugs to alter motor deficits and locomotor activity was studied in MPTP-treated common marmosets. Both the D-2 agonist quinpirole and the mixed D-1/D-2 agonist apomorphine reversed the motor impairments and induced locomotor activity. The D-1 antagonist SCH 23390 and the D-2 antagonist raclopride given alone further reduced motor function in MPTP-treated animals. The actions of quinpirole were potently and completely inhibited by raclopride but only partially and inconsistently by SCH 23390. In contrast, the effects of apomorphine were markedly but incompletely inhibited by both raclopride and SCH 23390. The D-1 agonist SKF 38393 alone caused a dose related reduction in motor activity. SKF 38393 weakly and partially inhibited the improvements in motor function produced by quinpirole but had a more pronounced effect on apomorphine induced motor activity. The induction of motor activity in MPTP treated common marmosets may separately involve both D-1 and D-2 receptors. Comparison with our previous data on the effect of the same drugs in normal common marmosets provides some evidence for a breakdown of linkage between D-1 and D-2 systems following MPTP treatment. The actions of SKF 38393 in MPTP-treated common marmosets contrasts with its ability to induce behavioural activation and a facilitation of D-2 mediated behaviour in rodents. SKF 38393 may not be the compound with which to delineate the role of D-1 receptors in primates.
Spatial vision of the achromat: Spatial frequency and orientation-specific adaptation
Creators: name: Greenlee, Mark W.
name: Magnussen, S.
name: Nordby, K.
Publisher: name: Universität Regensburg
Year: 1988
Subjects: subject: 150 Psychologie

description: 1. The psychophysical technique of selective adaptation to stationary sine-wave gratings of varying spatial frequency and orientation was used to investigate the central processing of spatial information in the visual system of the complete achromat. 2. For adapting spatial frequencies of 1 and 2 cycles/deg, the spatial frequency and orientation selectivity of contrast threshold elevation is similar for achromatic and trichromatic vision. 3. For adapting frequencies below 1 cycle/deg, the achromat shows threshold elevations of normal magnitude with symmetrical spatial frequency and orientation tuning for adapting frequencies as low as 0.09 cycles/deg with 'bandwidth' estimates similar to those found at high frequencies in the trichromat. Below 0.66 cycles/deg no after-effect could be obtained in the trichromat, and the frequency tuning at 0.66 cycles/deg was skewed towards higher frequencies. 4. The interocular transfer of low-frequency adaptation in the achromat was 50%, which is the same value obtained at higher frequencies. 5. The time course of the decay of low spatial frequency adaptation in the achromat was similar to that found at higher frequencies. 6. Control experiments show no low-frequency adaptation in peripheral vision or in central vision in the dark-adapted trichromat indicating that low spatial frequency adaptation cannot be elicited through the rod system of the trichromat. 7. It is proposed that the observed range shift of adaptable spatial frequency mechanisms in the achromat's visual cortex is the result of an arrest at an early stage of sensory development. The visual cortex of the achromat is comparable, with respect to spatial processing, to that of the young, visually normal human infant.
Evolutionary Algorithms for Hard Quantum Control
Creators: name: Zahedinejad, Ehsan
name: Schirmer, Sophie
name: Sanders, Barry C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Although quantum control typically relies on greedy (local) optimization, traps (irregular critical points) in the control landscape can make optimization hard by foiling local search strategies. We demonstrate the failure of greedy algorithms to realize two fast quantum computing gates: a qutrit phase gate and a controlled-not gate. Then we show that our evolutionary algorithm circumvents the trap to deliver effective quantum control in both instances. Even when greedy algorithms succeed, our evolutionary algorithm delivers a superior control procedure because less time resolution is required for the control sequence.
Transport Equations for Subdiffusion with Nonlinear Particle Interaction
Creators: name: Straka, Peter
name: Fedotov, Sergei
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences
subject: 60J60, 35K57, 60G50

description: We show how the nonlinear interaction effects `volume filling' and `adhesion' can be incorporated into the fractional subdiffusive transport of cells and individual organisms. To this end, we use microscopic random walk models with anomalous trapping and systematically derive generic non-Markovian and nonlinear governing equations for the mean concentrations of the subdiffusive cells or organisms. We uncover an interesting interaction between the nonlinearities and the non-Markovian nature of the transport. In the subdiffusive case, this interaction manifests itself in a nontrivial combination of nonlinear terms with fractional derivatives. In the long time limit, however, these equations simplify to a form without fractional operators. This provides an easy method for the study of aggregation phenomena. In particular, this enables us to show that volume filling can prevent "anomalous aggregation," which occurs in subdiffusive systems with a spatially varying anomalous exponent.
Frölicher-smooth geometries, quantum jet bundles and BRST symmetry
Creators: name: Canarutto, Daniel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 58B99, 81T13, 81T20

description: We attempt a clarification of geometric aspects of quantum field theory by using the notion of smoothness introduced by Frölicher and exploited by several authors in the study of functional bundles. A discussion of momentum and position representations in curved spacetime, in terms of generalized semi-densities, leads to a definition of quantum configuration bundle which is suitable for a treatment of that kind. A consistent approach to Lagrangian field theories, vertical infinitesimal symmetries and related currents is then developed, and applied to a formulation of BRST symmetry in a gauge theory of the Yang-Mills type.
description: 26 pages, Journal of Geometry and Physics (2014)
Intrinsic Volumes of Random Cubical Complexes
Creators: name: Werman, Michael
name: Wright, Matthew L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60D05, 52C99

description: Intrinsic volumes, which generalize both Euler characteristic and Lebesgue volume, are important properties of $d$-dimensional sets. A random cubical complex is a union of unit cubes, each with vertices on a regular cubic lattice, constructed according to some probability model. We analyze and give exact polynomial formulae, dependent on a probability, for the expected value and variance of the intrinsic volumes of several models of random cubical complexes. We then prove a central limit theorem for these intrinsic volumes. For our primary model, we also prove an interleaving theorem for the zeros of the expected-value polynomials. The intrinsic volumes of cubical complexes are useful for understanding the shape of random $d$-dimensional sets and for characterizing noise in applications.
description: 17 pages with 7 figures; this version includes a central limit theorem
Brief [Francisco] Guilimanno
Creators: name: Staal, Hans Jakob von
Publisher: name: [s.n.]
Year: 1599

description: von Jo[hann] Jac[obus vom] Staal
description: Brief Nr. 195, auf der Rückseite befindet sich Nr. 326.
description: Lateinisch
description: Verzeichnung=Description=Inventaire Juni 2016/August 2022 HAN-Katalogisierungsregeln iho/HBr
Equivalence of wave-particle duality to entropic uncertainty
Creators: name: Coles, Patrick J.
name: Kaniewski, Jędrzej
name: Wehner, Stephanie
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Interferometers capture a basic mystery of quantum mechanics: a single particle can exhibit wave behavior, yet that wave behavior disappears when one tries to determine the particle's path inside the interferometer. This idea has been formulated quantitively as an inequality, e.g., by Englert and Jaeger, Shimony, and Vaidman, which upper bounds the sum of the interference visibility and the path distinguishability. Such wave-particle duality relations (WPDRs) are often thought to be conceptually inequivalent to Heisenberg's uncertainty principle, although this has been debated. Here we show that WPDRs correspond precisely to a modern formulation of the uncertainty principle in terms of entropies, namely the min- and max-entropies. This observation unifies two fundamental concepts in quantum mechanics. Furthermore, it leads to a robust framework for deriving novel WPDRs by applying entropic uncertainty relations to interferometric models. As an illustration, we derive a novel relation that captures the coherence in a quantum beam splitter.
description: 9 + 16 pages, 8 figures. v2 presents a more complete and more general framework for wave-particle duality relations, as well as a more detailed analysis of the literature