cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
First exit time from a bounded interval for pseudo-processes driven by the equation $\partial/\partial t=(-1)^{N-1}\partial^{2N}/\partial x^{2N}$
Creators: name: Lachal, Aimé
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: Let $N$ be a positive integer. We consider pseudo-Brownian motion $X=(X(t))_{t\ge 0}$ driven by the high-order heat-type equation $\partial/\partial t=(-1)^{N-1}\partial^{2N}/\partial x^{2N}$. Let us introduce the first exit time τab from a bounded interval $(a,b)$ by $X$ ($a,b\in\mathbb{R}$). In this paper, we provide a representation of the joint pseudo-distribution of the vector $(τ_{ab},X(τ_{ab}))$ by means of Vandermonde-like determinants. The method we use is based on the Feynman-Kac functional related to pseudo-Brownian motion which leads to a boundary value problem. In particular, the pseudo-distribution of the location of $X$ at time $τ_{ab}$, namely $X(τ_{ab})$, admits a fine expression involving famous Hermite interpolating polynomials.
description: 28 pages
Radiation from a moving planar dipole layer: patch potentials vs dynamical Casimir effect
Creators: name: Fosco, Cesar D.
name: Mazzitelli, Francisco D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We study the classical electromagnetic radiation due to the presence of a dipole layer on a plane that performs a bounded motion along its normal direction, to the first non-trivial order in the amplitude of that motion. We show that the total emitted power may be written in terms of the dipole layer autocorrelation function. We then apply the general expression for the emitted power to cases where the dipole layer models the presence of patch potentials, comparing the magnitude of the emitted radiation with that coming from the quantum vacuum in the presence of a moving perfect conductor (dynamical Casimir effect).
description: 5 pages, no figures
Photodissociation of interstellar ArH+
Creators: name: Roueff, E.
name: Alekseyev, A. B.
name: Bourlot, J. Le
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Aims. Following the recent detection of 36ArH+ in the Crab nebula spectrum, we have computed the photodissociation rate of ArH+ in order to constrain the physical processes at work in this environment. Methods. Photodissociation cross sections of ArH+ are computed in an ab initio approach including explicit account of spin-orbit coupling. Results. We report the photodissociation cross section of ArH+ as a function of wavelength. Photodissociation probabilities are derived for different impinging radiation fields.The photodissociation probability of for a very small unshielded cloud surrounded on all sides by the unshielded InterStellar Radiation Field (ISRF) model described by Draine (1978) is equal to 9.9e-12 s-1 and 1.9e-9 s-1 in the Crab nebula conditions. The dependence on the visual extinction is obtained by using the Meudon Photon Dominated Region (PDR) code and corresponding analytical fits are provided. Conclusions. These data will help to produce a realistic chemical network to interpret the observations. Photodissociation of ArH+ is found to be moderate and the presence of this molecular ion is mainly dependent on the molecular fraction
description: 11 pages, 6 Figures, Accepted in Astronomy Astrophysics
Materielle Kultur, Repräsentation und Distinktion im Exil. Adelige Emigranten aus den österreichischen Erbländern in süddeutschen Reichsstädten
Creators: name: Löffler, Josef
Publisher: name: Institut für Realienkunde des Mittelalters und der frühen Neuzeit
Year: 2018
Subjects: Frühe Neuzeit
Migration
Adel
Geschichte
Exil
Protestantismus
History
Early Modern Period
Protestantism
Nobility
Exile

description: Der Beitrag beschäftigt sich mit der materiellen Kultur österreichischer Adelsfamilien, die im Zuge der Gegenreformation
	im 17. Jahrhundert in süddeutsche Reichsstädte ausgewandert sind. Es soll dabei untersucht werden, welche Rolle Objekte
	und die mit diesen in Zusammenhang stehenden Praktiken für die adelige Repräsentation und als Abgrenzung zum städtischen
	Umfeld spielten. Angesprochen werden dabei verschiedene Bereiche adeligen Lebens, nämlich Unterkunft und Mobiliar, Bibliotheken
	und Kunstsammlungen, der Umgang mit Waffen sowie Feiern anlässlich einzelner Lebensstationen.
description: MEMO Medieval and Early Modern Material Culture Online; Volume 2018 (3); Seitenzahl: x; ISSN: 2523-2932
Bayesian data augmentation dose finding with continual reassessment method and delayed toxicity
Creators: name: Liu, Suyu
name: Yin, Guosheng
name: Yuan, Ying
Publisher: name: arXiv
Year: 2014
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: A major practical impediment when implementing adaptive dose-finding designs is that the toxicity outcome used by the decision rules may not be observed shortly after the initiation of the treatment. To address this issue, we propose the data augmentation continual reassessment method (DA-CRM) for dose finding. By naturally treating the unobserved toxicities as missing data, we show that such missing data are nonignorable in the sense that the missingness depends on the unobserved outcomes. The Bayesian data augmentation approach is used to sample both the missing data and model parameters from their posterior full conditional distributions. We evaluate the performance of the DA-CRM through extensive simulation studies and also compare it with other existing methods. The results show that the proposed design satisfactorily resolves the issues related to late-onset toxicities and possesses desirable operating characteristics: treating patients more safely and also selecting the maximum tolerated dose with a higher probability. The new DA-CRM is illustrated with two phase I cancer clinical trials.
description: Published in at http://dx.doi.org/10.1214/13-AOAS661 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Von Truhen und Schätzen. Ein Gespräch mit Christina Antenhofer
Publisher: name: Institut für Realienkunde des Mittelalters und der frühen Neuzeit
Year: 2018
Subjects: Mittelalter
Geschichte
Briefe
Möbel
Kulturerbe
Materielle Kultur
Middle Ages
Letters
Furniture
History
Cultural Heritage
Material Culture

description: Elisabeth Gruber und Gabriele Schichta sprachen mit Christina Antenhofer über ihr Interesse an den Dingen,
	über mögliche Schnittstellen zwischen Geschichtswissenschaften und Materialität und darüber, welche Rolle
	die Schriftlichkeit dabei spielt. Sie hat im Rahmen ihrer Habilitationsschrift entlang der deutsch-italienischen
	fürstlichen Eheverbindungen des 14. und 15. Jahrhunderts die Beziehungen zwischen den Dingen und den Menschen in
	den Blick genommen - und dabei ein Auge auf die Brauttruhen geworfen.
	Elisabeth Gruber and Gabriele Schichta met with Christina Antenhofer to talk about her interest in things,
	about possible interfaces between historical sciences and materiality, and about the role of written documentation.
	In her recent research project, she focussed on the relationship between things and people along the lines of
	German-Italian princely marriages of the 14th and 15th centuries, with a special interest in bridal chests.
Fasciarma Shahdadi & Schubart, 2018, GEN. NOV.
Creators: name: Shahdadi, Adnan
name: Schubart, Christoph D
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Sesarmidae
Fasciarma

description: FASCIARMA GEN. NOV.
Type species: Sesarma fasciata Lanchester, 1900, by present designation.
Diagnosis: Relatively small sized (up to 1.36 cm carapace width among studied material). Carapace squarish (slightly broader than long), carapace regions distinguishable, but not well defined, lateral margins of carapace with indentation. Male chelipeds relatively robust, chela palm with two oblique to nearly longitudinal ridges on the dorsal surface, each with chitinous caps, dorsal surface of chela dactylus bears low tubercles with chitinous peaks. Walking legs relatively long, slender, meri narrow. Pleon of male relatively wide, triangular, telson slightly wider than long. Male press button absent. Female vulvae entirely located in sternite 5 with an elongated operculum, rimmed perpendicular to sternal sutures.
Etymology: The name Fasciarma is composed of two parts: fascia, is derived from the name of the type species fasciatum, and arma is derived from the last part of its former genus Perisesarma, as well as from the type genus of the family, Sesarma. Gender neuter. Remarks: This genus is restricted to a single species, F. fasciatum. We briefly redescribe this species with regards to its key characters, as it was not adequately illustrated before. The synonym (after =) is adopted from Ng et al. (2008).
description: Published as part of Shahdadi, Adnan & Schubart, Christoph D, 2018, Taxonomic review of Perisesarma (Decapoda: Brachyura: Sesarmidae) and closely related genera based on morphology and molecular phylogenetics: new classification, two new genera and the questionable phylogenetic value of the epibranchial tooth, pp. 517-548 in Zoological Journal of the Linnean Society 182 (3) on page 539, DOI: 10.1093/zoolinnean/zlx032, http://zenodo.org/record/14812722
Project readme
Creators: name: Ibeh, Neke
name: FEIGIN, CHARLES
name: FRANKENBERG, STEPHEN
name: PASK, ANDREW
name: GALLEGO ROMERO, IRENE
Publisher: name: University of Melbourne
Year: 2023
Subjects: classificationCode: 310508
subject: Genome structure and regulation
classificationCode: 310509
subject: Genomics
classificationCode: 310510
subject: Molecular evolution
classificationCode: 310204
subject: Genomics and transcriptomics

description: Readme for project contents
Growth of equilibrium structures built from a large number of distinct component types
Creators: name: Hedges, Lester O.
name: Mannige, Ranjan V.
name: Whitelam, Stephen
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We use simple analytic arguments and lattice-based computer simulations to study the growth of structures made from a large number of distinct component types. Components possess 'designed' interactions, chosen to stabilize an equilibrium target structure in which each component type has a defined spatial position, and 'undesigned' interactions that allow components to bind in a compositionally-disordered way. We find that high-fidelity growth of the equilibrium target structure can happen in the presence of substantial attractive undesigned interactions, as long as the energy scale of the set of designed interactions is chosen appropriately. This observation may help explain why equilibrium DNA 'brick' structures self-assemble even if undesigned interactions are not suppressed [Ke et al. Science 338, 1177 (2012)]. We also find that high-fidelity growth of the target structure is most probable when designed interactions are drawn from a distribution that is as narrow as possible. We use this result to suggest how to choose complementary DNA sequences in order to maximize the fidelity of multicomponent self-assembly mediated by complementary DNA interactions. We also comment on the prospect of growing macroscopic structures in this manner
description: 13 pages, 10 figures
Vortex-crystal pattern in an anti-artificial spin ice system
Creators: name: de Araujo, C. I. L.
name: Silva, R. C.
name: Ribeiro, I. R. B.
name: Nascimento, F. S.
name: Felix, J. F.
name: Ferreira, S. O.
name: Mól, L. A. S.
name: Moura-Melo, W. A.
name: Pereira, A. R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have proposed in this work an original system composed by anti-dots nanopatterned in a ferromagnetic thin film, mimicking negatively the structure of an articial spin ice. In the hysteresis loop we notice the emergency of an anisotropy in the magnetization saturation and in the micromagnetic simulations, in the beginning of the hysteresis loop (relaxation), the formation of a vortex crystal array with vortices in diferent positions possessing random polarization and chirality. The crystal of vortices in this electrically connected sample could be most eficient than those observed in non-connected nanodiscs for current-driven or magnetic vortices switching by electric currents.
description: 5 pages, 4 figures
title: Object Links
Creators: name: Gruber, Elisabeth
name: Schichta, Gabriele
name: Löffler, Josef
name: Schlie, Heike
Publisher: name: Institut fuer Realienkunde des Mittelalters und der fruehen Neuzeit
Year: 2018
Subjects: Fruehe Neuzeit
Mittelalter
Kunstgeschichte
Geschichte
History
Art History
interdisziplinaer
interdisciplinary
Materielle Kultur
Realienkunde
material culture studies
Middle Ages
Early Modern Period

description: Die vorliegende Ausgabe enthält zwei Forschungsbeiträge aus den
		Bereichen Kunstgeschichte und Geschichtswissenschaft, die sich aus unterschiedlichen
		Fragestellungen, Projekten und Forschungsinteressen heraus mit 'Object Links' - d.h. mit den Beziehungen, die zwischen
		Objekten und zwischen Objekten und Menschen bestehen sowie mit den Beziehungen,
		die durch Objekte gestiftet werden -  in der materiellen Kultur des Mittelalters und der Frühen Neuzeit beschäftigen.
		Ebenfalls in dieser Ausgabe enthalten ist ein wissenschaftliches Interview mit Prof. Christina Antenhofer, Inhaberin des Lehrstuhls für Mittelalterliche Geschichte an der Paris-Lodron-Universität Salzburg, in dem sie
		ihren persönlichen Zugang zu den Objekten erörtert und über die Object Links in ihrer bisherigen Forschung erzählt.
		Elisabeth Gruber, Gabriele Schichta: Von Truhen und Schätzen. Ein Gespräch mit Christina Antenhofer;
		Josef Löffler: Materielle Kultur, Repräsentation und Distinktion im Exil;
		Heike Schlie: Die Ordnung der Reime. Zur Konmedialität von Schrift und Bild in ihrer ursprünglichen Setzung auf dem Klosterneuburger Ambo des Nikolaus von Verdun;
description: MEMO Medieval and Early Modern Material Culture Online; Volume 2018 (3); Seitenzahl: 67; ISSN: 2523-2932
Expression driven Trignometric based Procedural Animation of Quadrupeds
Creators: name: Bhatti, Zeeshan
name: Shah, Asadullah
name: Karabasi, Mustafa
name: Mahesar, Waheed
Publisher: name: arXiv
Year: 2014
Subjects: subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences

description: This research paper addresses the problem of generating involuntary and precise animation of quadrupeds with automatic rigging system of various character types. The technique proposed through this research is based on a two tier animation control curve with base simulation being driven through dynamic mathematical model using procedural algorithm and the top layer with a custom user controlled animation provided with intuitive Graphical User Interface (GUI). The character rig is based on forward and inverse kinematics driven through trigonometric based motion equations. The User is provided with various manipulators and attributes to control and handle the locomotion gaits of the characters and choose between various types of simulated motions from walking, running, trotting, ambling and galloping with complete custom controls to easily extend the base simulation as per requirements.
description: 6 pages, 8 figures, Conference paper
Excess wing in glass-forming glycerol and LiCl-glycerol mixtures detected by neutron scattering
Creators: name: Gupta, S.
name: Arend, N.
name: Lunkenheimer, P.
name: Loidl, A.
name: Stingaciu, L.
name: Jalarvo, N.
name: Mamontov, E.
name: Ohl, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The relaxational dynamics in glass-forming glycerol and glycerol mixed with LiCl is in-vestigated using different neutron scattering techniques. The performed neutron spin-echo experiments, which extend up to relatively long relaxation-time scales of the order of 10 ns, should allow for the detection of contributions from the so-called excess wing. This phenomenon, whose microscopic origin is controversially discussed, arises in a variety of glass formers and, until now, was almost exclusively investigated by dielectric spectros-copy and light scattering. Here we show that the relaxational process causing the excess wing also can be detected by neutron scattering, which directly couples to density fluctua-tions.
description: 8 pages, 6 figures
A Lagrangian for Hamiltonian vector fields on singular Poisson manifolds
Creators: name: Turki, Yahya
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 37J05, 53D17

description: On a manifold equipped with a bivector field, we introduce for every Hamiltonian a Lagrangian on paths valued in the cotangent space whose stationary points projects onto Hamiltonian vector fields. We show that the remaining components of those stationary points tell whether the bivector field is Poisson or at least defines an integrable distribution - a class of bivector fields generalizing twisted Poisson structures that we study in detail.
description: 27 pages
The Quantization Conditions in Curved Spacetime and Uncertainty Driven Inflation
Creators: name: Camp, Paul J.
name: Safko, John L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: An alternative inflationary model is proposed predicated upon a consideration of the form of the uncertainty principle in a curved background spacetime. An argument is presented suggesting a possible curvature dependence in the correct commutator relations for a quantum field in a classical background which cannot be deduced by simply extrapolation from the flat spacetime theory. To assess the possible consequences of this dependence, we apply the idea to a scalar field in a closed Friedmann-Robertson-Walker background, using a simple model for the curvature dependence (along the way, a previous result obtained by Bunch (1980) for the adiabatically expanded wave function is corrected). The result is a time-dependent cosmological constant, producing a vast amount of inflation that is independent of the mass of the matter field or its effective potential. Furthermore, it is seen that the field modes are initially zero for all wavelengths and come into being as the universe evolves. In this sense, the universe creates its contents out of its own expansion. At the end of the process, the matter field is far from equilibrium and essentially reproduces the initial conditions for the New Inflationary Model.
description: This is an old paper but I resurrect it now because it made the interesting prediction of a small residual positive cosmological constant. That may make it worth recalling
title: Vierte Änderung der Finanz- und Haushaltsordnung der Studierendenschaft der Universität Paderborn
title: vom 21. Dezember 2018
titleType: Subtitle
Creators: name: Universität Paderborn
Publisher: name: UB-PAD - Paderborn University Library
Year: 2018

description: Amtliche Mitteilungen / Universität Paderborn
Supplementary document for Deep learning using residual deconvolutional network enables real-time high-density single-molecule localization microscopy - 6353834.pdf
Creators: name: Zhou, Zhiwei
name: Wu, Junnan
name: WANG, Zhengxia
name: Huang, Zhen-li
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Supplement 1
Electric-field-tunable mechanical properties of relaxor ferroelectric single crystal measured by nanoindentation
Creators: name: Zhou, Hao
name: Pei, Yongmao
name: Li, Faxin
name: Luo, Haosu
name: Fang, Daining
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences
subject: 74F15

description: Electric field dependent mechanical properties of relaxor ferroelectric material Pb(Mn1/3Nb2/3)O3-PbTiO3 are investigated with the nanoindentation technique. Giant electric-field-tunable apparent elastic modulus (up to -39%), hardness (-9% to 20%) and energy dissipation (up to -13%) are reported. Based on experimental data, a characterization method of electromechanical coupled nanoindentation is proposed. In this method, an electric field tunable scaling relationship among elastic modulus, hardness and indentation work for ferroelectric materials can be determined. In addition, this method can be used to obtain the electric-field-dependent elastic modulus and hardness, and avoid the estimate of contact area in the Oliver-Pharr method. Finally, the different effects on elastic modulus between positive and negative electric fields can be explained by the flexoelectric effect.
description: 14 pages, 4 figures
Full pseudoscalar mesonic chiral Lagrangian at p6 order under the unitary group
Creators: name: Jiang, Shao-Zhou
name: Ge, Feng-Jun
name: Wang, Qing
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We construct the full p6 order chiral Lagrangians for the unitary group and special unitary groups, including nf-, three- and two-flavor cases, all bilinear currents (scalar, pseudoscalar, vector, axial-vector and tensor currents) and theta parameter. The number of independent operators are 1391, 1326 and 969 for each of the flavor unitary groups. From these results, we find one extra linear relation among the traditional p4 order low-energy constants under the U(3) group, and some more linear relations with tensor sources for the p6 order low-energy constants in the special unitary groups. We develop a scheme to obtain the relations for the dependent operators in terms of independent operators.
description: 23 pages
Stochastic Models for Precipitation
Creators: name: Purdue, Peter
name: Govindarajulu, Z.
Publisher: name: Kentucky Water Resources Research Institute, University of Kentucky
Year: 1977

description: Abstract:
In this project a stochastic model, using Semi-Markov Processes, was developed to simulate daily rainfall patterns in Kentucky. This model contains many of the currently used models as special cases and is applicable at any station in Kentucky as well as elsewhere.
For use in Kentucky an 8 state Semi-Markov Process is developed and the parameters of the model are determined from historical rainfall data. The model is tested at 4 different stations in Kentucky and the simulated and actual rainfall processes are found to be in good agreement. Finally some long run probabilities are calculated as well as mean return times. An appendix outlining some basic properties of the Semi-Markov Process is also included.
Funding information: The work on which this report is based was supported in part by funds provided by the Office of Water Research and Technology, United States Department of the Interior, as authorized under the Water Resources Research Act of 1964. This report is Part II of the technical completion report for the research project entitled "Stochastic and Statistical Models for Precipitation". The project was supported by funds provided by the United States Department of Interior to the University of Kentucky Water Resources Institute as authorized by the Water Resources Act of 1964, Public Law 88-379, as Office of Water Resources Research Project No. A-055-KY.
Crystalline Copper Selenide as a Reliable Non‐Noble Electro(pre)catalyst for Overall Water Splitting
Creators: name: Chakraborty, Biswarup
name: Beltrán‐Suito, Rodrigo
name: Hlukhyy, Viktor
name: Schmidt, Johannes
name: Menezes, Prashanth W.
name: Driess, Matthias
Publisher: name: Technische Universität Berlin
Year: 2020
Subjects: subject: 540 Chemie und zugeordnete Wissenschaften
subject: copper selenide
subject: electrocatalysis
subject: klockmannite
subject: non-noble metal catalyst
subject: overall water splitting

description: Electrochemical water splitting remains a frontier research topic in the quest to develop artificial photosynthetic systems by using noble metal‐free and sustainable catalysts. Herein, a highly crystalline CuSe has been employed as active electrodes for overall water splitting (OWS) in alkaline media. The pure‐phase klockmannite CuSe deposited on highly conducting nickel foam (NF) electrodes by electrophoretic deposition (EPD) displayed an overpotential of merely 297 mV for the reaction of oxygen evolution (OER) at a current density of 10 mA cm−2 whereas an overpotential of 162 mV was attained for the hydrogen evolution reaction (HER) at the same current density, superseding the Cu‐based as well as the state‐of‐the‐art RuO2 and IrO2 catalysts. The bifunctional behavior of the catalyst has successfully been utilized to fabricate an overall water‐splitting device, which exhibits a low cell voltage (1.68 V) with long‐term stability. Post‐catalytic analyses of the catalyst by ex‐situ microscopic, spectroscopic, and analytical methods confirm that under both OER and HER conditions, the crystalline and conductive CuSe behaves as an electro(pre)catalyst forming a highly reactive in situ crystalline Cu(OH)2 overlayer (electro(post)catalyst), which facilitates oxygen (O2) evolution, and an amorphous Cu(OH)2/CuOx active surface for hydrogen (H2) evolution. The present study demonstrates a distinct approach to produce highly active copper‐based catalysts starting from copper chalcogenides and could be used as a basis to enhance the performance in durable bifunctional overall water splitting.
Comparative high-pressure investigations of Ag2ZnSnS4 and Ag2CdSnS4 compounds
Creators: name: Suss, Nicole Yvonne
name: Heppke, Eva M.
name: Voloshina, Elena
name: Schifferle, Lukas
name: Lobanov, Sergey S.
name: Speziale, Sergio
name: Reichmann, Hans Josef
name: Küllmey, Tim
name: Paulus, Beate
name: Lerch, Martin
name: Efthimiopoulos, Ilias
Publisher: name: Freie Universität Berlin
Year: 2023
Subjects: subject: Phase transitions
subject: Semiconductors
subject: Crystal structure
subject: Compressive stress
subject: Polymorphism
subject: Raman spectroscopy
subject: Thin films
subject: X-ray diffraction
subject: Photovoltaics
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften

description: Quaternary kesterite-type (KS) compounds have attracted worldwide attention from the scientific community as promising materials for solar cells. On the route to optimizing their performance, the effect of stress and strain constitutes a critical factor when it comes to thin film applications. Following a recent theoretical study, we report here joint experimental and computational high-pressure investigations on the KS Ag2ZnSnS4 and wurtz–kesterite (WZ–KS)-type Ag2CdSnS4 compounds. Our results reveal that both materials undergo successive transformations, first into a GeSb-type and then toward a CrN-type modification at ambient temperature. Our theoretical calculations predict a metallic character for all Ag2ZnSnS4 and Ag2CdSnS4 high-pressure phases. In addition, structural disorder is observed in KS Ag2ZnSnS4 upon moderate compression, prior to its KS → GeSb-type transition. Decompression leads to the recovery of a disordered zinc blende-type structure in the latter, whereas Ag2CdSnS4 retains the disordered GeSb-type modification. The similarities and deviations from the archetypical KS Cu2ZnSnS4 are discussed.
Characterization of a topological Mott insulator in one dimension
Creators: name: Yoshida, Tsuneya
name: Peters, Robert
name: Fujimoto, Satoshi
name: Kawakami, Norio
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate properties of a topological Mott insulator in one dimension by examining the bulk topological invariant and the entanglement spectrum of a correlated electron model. We clarify how gapless edge states in a non-interacting topological band insulator evolve into spinon edge states in a topological Mott insulator. Furthermore, we propose a topological Mott transition, which is a new type of topological phase transition and never observed in free fermion systems. This unconventional transition occurs in spin liquid phases in the Mott insulator and is accompanied by zeros of the single-electron Green's function and a gap closing in the spin excitation spectrum.
description: 8 pages, 6 figures, to be published in PRL
Relaxation Oscillations in the Formation of a Polariton Condensate
Creators: name: De Giorgi, Milena
name: Ballarini, Dario
name: Cazzato, Paolo
name: Deligeorgis, George
name: Tsintzos, Simos I.
name: Hatzopoulos, Zacharias
name: Savvidis, Pavlos G.
name: Gigli, Giuseppe
name: Laussy, Fabrice P.
name: Sanvitto, Daniele
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report observation of oscillations in the dynamics of a microcavity polariton condensate formed under pulsed non resonant excitation. While oscillations in a condensate have always been attributed to Josephson mechanisms due to a chemical potential unbalance, here we show that under some localisation conditions of the condensate, they may arise from relaxation oscillations, a pervasive classical dynamics that repeatedly provokes the sudden decay of a reservoir, shutting off relaxation as the reservoir is replenished. Using non-resonant excitation, it is thus possible to obtain condensate injection pulses with a record frequency of 0:1 THz.
Validation of pressure drop prediction and bed generation of fixed‐beds with complex particle shapes using discrete element method and computational fluid dynamics
Creators: name: Jurtz, Nico
name: Wehinger, Gregor D.
name: Srivastava, Urvashi
name: Henkel, Tobias
name: Kraume, Matthias
Publisher: name: Technische Universität Berlin
Year: 2020
Subjects: subject: 660 Chemische Verfahrenstechnik
subject: bed voidage
subject: fixed‐bed reactor
subject: numerical modeling
subject: particle orientation
subject: pressure drop

description: Catalytic fixed‐bed reactors with a low tube‐to‐particle diameter ratio are widely used in industrial applications. The heterogeneous packing morphology in this reactor type causes local flow phenomena that significantly affect the reactor performance. Particle‐resolved computational fluid dynamics has become a predictive numerical method to analyze the flow, temperature, and species field, as well as local reaction rates spatially and may, therefore, be used as a design tool to develop new improved catalyst shapes. Most validation studies which have been presented in the past were limited to simple particle shapes. More complex catalyst shapes are supposed to increase the reactor performance. A workflow for the simulation of fixed‐bed reactors filled with various industrially relevant complex particle shapes is presented and validated against experimental data in terms of bed voidage and pressure drop. Industrially relevant loading strategies are numerically replicated and their impact on particle orientation and bed voidage is investigated.
Observation of anomalous temperature dependence of spectrum on small Fermi surfaces in a BiS2-based superconductor
Creators: name: Zeng, L. K.
name: Wang, X. B.
name: Ma, J.
name: Richard, P.
name: Nie, S. M.
name: Weng, H. M.
name: Wang, N. L.
name: Wang, Z.
name: Qian, T.
name: Ding, H.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We performed an angle-resolved photoemission spectroscopy study of the BiS2-based superconductor Nd(O,F)BiS2. Two small electron-like Fermi surfaces around X (pi, 0) are observed, which enclose 2.4% and 1.1% of the Brillouin zone area, respectively, corresponding to an electron doping of 7% per Bi site. The low-energy spectrum consists of a weakly-dispersing broad hump and a dispersive branch, which follows well the calculated band dispersion. This hump is drastically suppressed with increasing temperature, while the dispersive branch is essentially unaffected. The anomalous thermal effect indicates a highly interacting electronic state, in which the superconducting pairing develops.
description: 5 pages, 4 figures
How To Quantify the Efficiency Potential of Neat Perovskite Films: Perovskite Semiconductors with an Implied Efficiency Exceeding 28%
Creators: name: Stolterfoht, Martin
name: Grischek, Max
name: Caprioglio, Pietro
name: Wolff, Christian M.
name: Gutierrez‐Partida, Emilio
name: Peña‐Camargo, Francisco
name: Rothhardt, Daniel
name: Zhang, Shanshan
name: Raoufi, Meysam
name: Wolansky, Jakob
name: Abdi‐Jalebi, Mojtaba
name: Stranks, Samuel D.
name: Albrecht, Steve
name: Kirchartz, Thomas
name: Neher, Dieter
Publisher: name: Technische Universität Berlin
Year: 2020
Subjects: subject: 530 Physik
subject: non‐radiative interface recombination
subject: perovskite solar cells
subject: photoluminescence

description: Perovskite photovoltaic (PV) cells have demonstrated power conversion efficiencies (PCE) that are close to those of monocrystalline silicon cells; however, in contrast to silicon PV, perovskites are not limited by Auger recombination under 1‐sun illumination. Nevertheless, compared to GaAs and monocrystalline silicon PV, perovskite cells have significantly lower fill factors due to a combination of resistive and non‐radiative recombination losses. This necessitates a deeper understanding of the underlying loss mechanisms and in particular the ideality factor of the cell. By measuring the intensity dependence of the external open‐circuit voltage and the internal quasi‐Fermi level splitting (QFLS), the transport resistance‐free efficiency of the complete cell as well as the efficiency potential of any neat perovskite film with or without attached transport layers are quantified. Moreover, intensity‐dependent QFLS measurements on different perovskite compositions allows for disentangling of the impact of the interfaces and the perovskite surface on the non‐radiative fill factor and open‐circuit voltage loss. It is found that potassium‐passivated triple cation perovskite films stand out by their exceptionally high implied PCEs > 28%, which could be achieved with ideal transport layers. Finally, strategies are presented to reduce both the ideality factor and transport losses to push the efficiency to the thermodynamic limit.
A contraction principle in semimetric spaces
Creators: name: Bessenyei, Mihály
name: Páles, Zsolt
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: A branch of generalizations of the Banach Fixed Point Theorem replaces contractivity by a weaker but still effective property. The aim of the present note is to extend the contraction principle in this spirit for such complete semimetric spaces that fulfill an extra regularity property. The stability of fixed points is also investigated in this setting. As applications, fixed point results are presented for several important generalizations of metric spaces.
Optimal Power Allocation for Distributed BLUE Estimation with Linear Spatial Collaboration
Creators: name: Fanaei, Mohammad
name: Valenti, Matthew C.
name: Jamalipour, Abbas
name: Schmid, Natalia A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper investigates the problem of linear spatial collaboration for distributed estimation in wireless sensor networks. In this context, the sensors share their local noisy (and potentially spatially correlated) observations with each other through error-free, low cost links based on a pattern defined by an adjacency matrix. Each sensor connected to a central entity, known as the fusion center (FC), forms a linear combination of the observations to which it has access and sends the resulting signal to the FC through an orthogonal fading channel. The FC combines these received signals to find the best linear unbiased estimator of the vector of unknown signals observed by individual sensors. The main novelty of this paper is the derivation of an optimal power-allocation scheme in which the coefficients used to form linear combinations of noisy observations at the sensors connected to the FC are optimized. Through this optimization, the total estimation distortion at the FC is minimized, given a constraint on the maximum cumulative transmit power in the entire network. Numerical results show that even with a moderate connectivity across the network, spatial collaboration among sensors significantly reduces the estimation distortion at the FC.
description: 5 Pages, 2 Figures, To appear at the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP) 2014
Optimal Systems of Storm Water Detention Basins in Urban Areas
Creators: name: Mynear, D. K.
name: Haan, C. T.
Publisher: name: Kentucky Water Resources Research Institute, University of Kentucky
Year: 1977

description: Abstract:
Flood retention basins are commonly used in urban areas to reduce the impact of urbanization on downstream flooding. When more than a few acres are developed, systems of retention basins are often required. A procedure has been developed whereby the optimum (least cost) system of basins can be determined to meet a given downstream flow requirement. The method considers several design options including basins on all subwatersheds, basins on only some of the subwatersheds, basins of various sizes and basins with various stage-discharge characteristics. The procedure has been developed in the form of a computer program to aid the designer in selecting the optimum system of stormwater retention basins.
This report develops the methodology, presents the computer program and illustrates the use of the program.
Funding information: The work on which this report is based was supported in part by funds provided by the Office of Water Research and Technology, The United States Department of the Interior, as authorized under the Water Resources Act of 1964. This research report results from work on a research project entitled "Evaluation of Detention Basins for Controlling Urban Runoff and Sedimentation." The work on which this report is based was supported in part by the Kentucky Agricultural Experiment Station and by funds provided by the Office of Water Research and Technology, The United States Department of the Interior as authorized under the Water Resources Act of 1964, Public Law 88-379, as amended.
A regularity structure for rough volatility
Creators: name: Bayer, Christian
name: Friz, Peter K.
name: Gassiat, Paul
name: Martin, Jorg
name: Stemper, Benjamin
Publisher: name: Technische Universität Berlin
Year: 2019
Subjects: subject: 510 Mathematik
subject: financial modeling
subject: rough volatility
subject: stochastic volatility models

description: A new paradigm has emerged recently in financial modeling: rough (stochastic) volatility. First observed by Gatheral et al. in high‐frequency data, subsequently derived within market microstructure models, rough volatility captures parsimoniously key‐stylized facts of the entire implied volatility surface, including extreme skews (as observed earlier by Alòs et al.) that were thought to be outside the scope of stochastic volatility models. On the mathematical side, Markovianity and, partially, semimartingality are lost. In this paper, we show that Hairer's regularity structures, a major extension of rough path theory, which caused a revolution in the field of stochastic partial differential equations, also provide a new and powerful tool to analyze rough volatility models.
High-Energy Emission of the First Millisecond Pulsar
Creators: name: Ng, C. -Y.
name: Takata, J.
name: Leung, G. C. K.
name: Cheng, K. S.
name: Philippopoulos, P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on X-ray and gamma-ray observations of the millisecond pulsar B1937+21 taken with the Chandra X-ray Observatory, XMM-Newton, and the Fermi Large Area Telescope. The pulsar X-ray emission shows a purely non-thermal spectrum with a hard photon index of 0.9+/-0.1, and is nearly 100% pulsed. We found no evidence of varying pulse profile with energy as previously claimed. We also analyzed 5.5 yr of Fermi survey data and obtained much improved constraints on the pulsar's timing and spectral properties in gamma-rays. The pulsed spectrum is adequately fitted by a simple power-law with a photon index of 2.38+/-0.07. Both the gamma-ray and X-ray pulse profiles show similar two-peak structure and generally align with the radio peaks. We found that the aligned profiles and the hard spectrum in X-rays seem to be common properties among millisecond pulsars with high magnetic fields at the light cylinder. We discuss a possible physical scenario that could give rise to these features.
description: 10 pages, 4 figures, accepted for publication in ApJ
A new CVD Diamond Mosaic-Detector for (n,$α$) Cross-Section Measurements at the n\_TOF Experiment at CERN
Creators: name: Weiss, C.
name: Griesmayer, E.
name: Guerrero, C.
name: Collaboration, the n\_TOF
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: At the n\_TOF experiment at CERN a dedicated single-crystal chemical vapor deposition (sCVD) Diamond Mosaic-Detector has been developed for (n,$α$) cross-section measurements. The detector, characterized by an excellent time and energy resolution, consists of an array of 9 sCVD diamond diodes. The detector has been characterized and a cross-section measurement has been performed for the $^{59}$Ni(n,$α$)$^{56}$Fe reaction in 2012. The characteristics of the detector, its performance and the promising preliminary results of the experiment are presented.
description: Conference proceedings of the Vienna Conference on Instrumentation 2013
Remote-Sensing Image Scene Classification With Deep Neural Networks in JPEG 2000 Compressed Domain
Creators: name: Preethy Byju, Akshara
name: Sumbul, Gencer
name: Demir, Begüm
name: Bruzzone, Lorenzo
Publisher: name: Technische Universität Berlin
Year: 2020
Subjects: subject: 006 Spezielle Computerverfahren
subject: compressed image domain
subject: deep neural networks
subject: DNNs
subject: joint photographic experts group 2020
subject: JPEG 2020
subject: remote sensing
subject: RS
subject: scene classification

description: To reduce the storage requirements, remote-sensing (RS) images are usually stored in compressed format. Existing scene classification approaches using deep neural networks (DNNs) require to fully decompress the images, which is a computationally demanding task in operational applications. To address this issue, in this article, we propose a novel approach to achieve scene classification in Joint Photographic Experts Group (JPEG) 2000 compressed RS images. The proposed approach consists of two main steps: 1) approximation of the finer resolution subbands of reversible biorthogonal wavelet filters used in JPEG 2000 and 2) characterization of the high-level semantic content of approximated wavelet subbands and scene classification based on the learned descriptors. This is achieved by taking codestreams associated with the coarsest resolution wavelet subband as input to approximate finer resolution subbands using a number of transposed convolutional layers. Then, a series of convolutional layers models the high-level semantic content of the approximated wavelet subband. Thus, the proposed approach models the multiresolution paradigm given in the JPEG 2000 compression algorithm in an end-to-end trainable unified neural network. In the classification stage, the proposed approach takes only the coarsest resolution wavelet subbands as input, thereby reducing the time required to apply decoding. Experimental results performed on two benchmark aerial image archives demonstrate that the proposed approach significantly reduces the computational time with similar classification accuracies when compared with traditional RS scene classification approaches (which requires full image decompression).
Phase modulated solitary waves controlled by bottom boundary condition
Creators: name: Mukherjee, Abhik
name: Janaki, M. S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: A forced KdV equation is derived to describe weakly nonlinear, shallow water surface wave propagation over non trivial bottom boundary condition. We show that different functional forms of bottom boundary conditions self-consistently produce different forced kdV equations as the evolution equations for the free surface. Solitary wave solutions have been analytically obtained where phase gets modulated controlled by bottom boundary condition whereas amplitude remains constant.
description: 13 pages, 6 figures, Accepted in Physical Review E
The crater function approach to ion-induced nanoscale pattern formation: Craters for flat surfaces are insufficient
Creators: name: Harrison, Matt P.
name: Bradley, R. Mark
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In the crater function approach to the erosion of a solid surface by a broad ion beam, the average crater produced by the impact of an ion is used to compute the constant coefficients in the continuum equation of motion for the surface. We extend the crater function formalism so that it includes the dependence of the crater on the curvature of the surface at the point of impact. We then demonstrate that our formalism yields the correct coefficients for the Sigmund model of ion sputtering if terms up to second order in the spatial derivatives are retained. In contrast, if the curvature dependence of the crater is neglected, the coefficients can deviate substantially from their exact values. Our results show that accurately estimating the coefficients using craters obtained from molecular dynamics simulations will require significantly more computational power than was previously thought.
Einleitung zu "Topik zwischen Modellierung und Operationalisierung"
Creators: name: Hinzmann, Maria
Publisher: name: Zenodo
Year: 2020
Subjects: Literaturwissenschaft, Reiseliteraturforschung, Kulturwissenschaft, Interkulturelle Germanistik, Postcolonial Studies, Literaturtheorie, Rhetorik, Digital Humanities, Geschichtswissenschaft, Sozialwissenschaft

description: Diese Datei ist die Einleitung zu folgendem Buch: https://www.transcript-verlag.de/978-3-8376-5227-7/topik-zwischen-modellierung-und-operationalisierung/.