cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Black hole mass estimation using X-ray variability measurements in Seyfert galaxies
Creators: name: Akylas, A.
name: Papadakis, I.
name: Georgakakis, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Our objective is to critically assess the X-ray flux variability as a tool for measuring the black hole (BH) mass in active galactic nuclei (AGN). We aim to establish a prescription for estimating BH masses based on measurements of the normalised excess variance from X-ray data. We discuss the minimum requirements in terms of the light-curve duration and X-ray signal-to-noise ratio (S/N) to enable a reliable determination that is comparable to what can be derived from the continuum and emission line reverberation studies. We used the light curves of local Seyfert from the Nuclear Spectroscopic Telescope Array hard X-ray mission (NuSTAR), to compute the normalised excess variance (NXV) in the 3-10 and 10-20 keV bands, thus extending the analysis to an energy band higher than 10 keV. The excess variance measurements were then combined with independent BH mass estimates from the literature to establish the MBH versus NXV relation for different samples and weigh its accuracy in terms of the light-curve duration and X-ray S/N. We find that it is possible to accurately measure the BH mass in AGN using excess variance measurements in the 3-10 and the 10-20 keV bands, however, strong quality requirements should be applied. The minimum necessary S/N and duration of the light curves used to compute the excess variance ought to be 3 and approximately 100 ks, respectively. We provide a linear relationship between the normalised excess variance and the black hole mass that can be used to estimate the latter, with an average uncertainty of the order of 0.4 to 0.25 dex (depending on the adopted light-curve segment duration).
description: 20 pages, 8 figures
title: Persistence of Depositional Features in a Strongly Seasonal, Tide-Dominated Delta
Creators: name: Brown, Kallie Flaxington
Publisher: name: Old Dominion University Libraries
Year: 2019

description: The Ganges-Brahmaputra-Meghna (GBM) Delta is one of the largest deltas in the world, covering more than 100,000 km2. The GBM River system transports over one billion tons of sediment annually and delivers ~750 million tons to the Bay of Bengal, ~25% of which is advected by tides into the fluvially abandoned western delta plain. The Sundarbans National Forest (SNF) is located within the GBM Delta and, covering more than 10,000 km2, is the world’s largest continuous mangrove stand. The present rate of sediment delivery allows the SNF platform elevation to keep pace with regional sea level rise, but India’s National River Linking Project (NRLP) could decrease the suspended sediment loads of Ganges and Brahmaputra Rivers by 39-75% and 9-25% respectively, and thus may change future sedimentation. In this study, we examine the idea that sediment stored in the tidal channels throughout the year is being resuspended and delivered to the mangrove platform during the dry season when sediment input to the system is at a minimum. Over two field seasons 70 shallow (<50 >cm) sediment cores were collected from the channel banks, imaged using x-radiography to observe fine scale changes in depositional characteristics on tidal channel banks, and subsampled for subsequent textural analysis. In more than half of the cores examined there is no change in the style of the laminations, suggesting that the processes controlling deposition remain constant throughout the year, despite a change in the external sediment supply. Cores where the depth of laminations decreases from wet to dry season demonstrate that sediment is being eroded from the banks and advected elsewhere, with the mangrove platform a likely sink. Over 70% of cores showed surface (0-2 cm) grain sizes coarsening between the monsoon to the dry season, which could be the product of the winnowing of fine sediments as overall sediment supply decreases and material with lower bulk density is preferentially taken away. Total organic carbon (TOC) results indicate constant reworking of sediment on the banks throughout the year. These results demonstrate that sediment in this system is constantly being reworked, and a portion of the sediment delivered to the platform during the dry season can be sourced from the banks.
Individual project on theme "Hyles." (MOOC: CompTech in biology)
Creators: name: Abramova Natalia
Publisher: name: Zenodo
Year: 2020

description: Данный кейс является результатом реализации индивидуального проекта Абрамовой Натальи по теме "Hyles" в рамках онлайн курса "Компьютерные технологии в биологии" (автор – А.В. Ваганов) (https://stepik.org/course/60859/promo)
Generic off-diagonal solutions and jet deformations in modified and/or higher dimension gravity theories
Creators: name: Rajpoot, Subhash
name: Vacaru, Sergiu I.
Publisher: name: Singapur : World Scientific Publishing Co. Pte. Ltd.
Year: 2018
Subjects: subject: Exact solutions
subject: Geometric methods and PDE
subject: Modified gravity
subject: Nonholonomic manifolds and jets
subject: Ricci solitons and Einstein spaces
subject: Deformation
subject: Mathematical transformations
subject: Relativity
subject: Solitons
subject: Associated symmetries
subject: Einstein equations
subject: Exact solution
subject: Geometric method
subject: Nonholonomics
subject: Soliton deformation
subject: Space-time coordinates
subject: Astrophysics
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Let g be a pseudo-Riemanian metric on a manifold V with conventional n+n dimensional splitting, n ≥ 2, for a nonholonomic (non-integrable) distribution N and consider a correspondingly adapted linear metric compatible connection D and its torsion T, both completely determined by g. We prove that there are certain generalized frame and/or jet transforms and prolongations with (g, V) → (g, V ) into explicit classes of solutions of some generalized Einstein equations R ic = Λg, Λ = const, encoding various types of (nonholonomic) Ricci soliton configurations and/or jet variables and symmetries, in particular, subject to the condition T = 0. This allows us to construct in general form generic off-diagonal exact solutions depending on all space time coordinates on V and its jet prolongations, via generating and integration functions and various classes of constants and associated symmetries. We consider an example when exact solutions are constructed as nonholonomic jet prolongations of the Kerr metrics, with possible Ricci soliton deformations, and characterized by generalized connections.
Discrete/Continuous Elliptic Harnack Inequality and Kernel Estimates for Functions of the Laplacian on a Graph
Creators: name: Cerenzia, Mark
name: Saloff-Coste, Laurent
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: This paper introduces certain elliptic Harnack inequalities for harmonic functions in the setting of the product space $M \times X$, where $M$ is a (weighted) Riemannian Manifold and $X$ is a countable graph. Since some standard arguments for the elliptic case fail in this "mixed" setting, we adapt ideas introduced by Thierry Delmotte for the discrete parabolic case. We then present some useful applications of this inequality, namely, a kernel estimate for functions of the Laplacian on a graph. This application in turn provides sharp estimates for certain Markov kernels on graphs. We then close this paper with an application to convolution power estimates on finitely generated groups of polynomial growth.
Locally anisotropic cosmological systems in modified two measure and massive gravity theories
Creators: name: Vacaru, Sergiu I.
Publisher: name: Singapur : World Scientific Publishing Co. Pte. Ltd.
Year: 2018
Subjects: subject: (Anisotropic) inflation
subject: Bi-metrics and bi-connections
subject: Dark energy
subject: Effective Einstein gravity
subject: Modified and massive gravity
subject: Nonholonomic dynamical weyl-scale symmetry breaking
subject: Off-diagonal cosmological solutions
subject: Reconstructing procedure
subject: Two measure theories
subject: Anisotropy
subject: Geometry
subject: Relativity
subject: Einstein gravity
subject: Measure theory
subject: Symmetry-breaking
subject: Cosmology
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We outline a geometric method of constructing generic off-diagonal and diagonal cosmological solutions of effective Einstein equations modeling modified gravity theories with two non-Riemannian volume forms and associated bimetric and/or biconnection geometric structures. Such solutions are determined by generating functions, effective sources and integration constants and characterized by nonholonomic frame torsion effects. In the physical Einstein frame, the constructions involve: (i) nonlinear re-parametrization symmetries of the generating functions and effective sources; (ii) effective potentials for the scalar field with possible two flat regions which allows unified description of locally anisotropic and/or isotropic early universe inflation related to acceleration cosmology and dark energy; (iii) there are “emergent universes” described by off-diagonal and diagonal solutions for certain nonholonomic phases and parametric cosmological evolution resulting in various inflationary phases; (iv) we can reproduce in two measure theories massive gravity effects.
Deeply virtual Compton scattering in the tensor-pomeron approach
Creators: name: Lebiedowicz, Piotr
name: Nachtmann, Otto
name: Szczurek, Antoni
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The two-tensor-pomeron model proposed previously to describe low $x$ DIS data is applied to real and virtual Compton scattering on a proton. The model includes two tensor pomerons, a soft and a hard one, and tensor reggeons. We include contributions of both transverse and longitudinal virtual photons. We show that this model gives a very good description of experimental data at small Bjorken $x$ on deeply virtual Compton scattering (DVCS) from HERA. The reggeon exchange term is particularly relevant for describing the real-photon-proton scattering measured at lower $γp$ energies at FNAL. We present two fits which differ somewhat in the strength of the hard pomeron contribution. In both fits we find that the interference between soft- and hard-pomeron exchange plays an important role. We find that in DVCS the soft-pomeron contribution is considerable up to $Q^{2} \sim 20$ GeV$^{2}$. Our model allows to study the transition from the small-$Q^{2}$ regime, including the photoproduction ($Q^{2} = 0$) limit, to the large-$Q^{2}$ regime, the DIS limit. We also discuss the ratio of cross sections for longitudinally and transversely polarized virtual photons in $γ^{*} p \to γp$ as a function of $|t|$ and $Q^2$. The ratio $\tilde{R}(Q^{2},W^{2},t) = (dσ_{\rm L} / dt) / (dσ_{\rm T} / dt)$ strongly increases with $t$. Our findings may be checked in future lepton-nucleon scattering experiments in the low-$x$ regime, for instance, at a future Electron-Ion Collider at the BNL (EIC), and, if LHeC is realized, at the LHC.
description: 20 pages, 7 figures
Valley Chern Numbers and Boundary Modes in Gapped Bilayer Graphene
Creators: name: Zhang, Fan
name: MacDonald, A. H.
name: Mele, E. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Electronic states at domain walls in bilayer graphene are studied by analyzing their four and two band continuum models, by performing numerical calculations on the lattice, and by using quantum geometric arguments. The continuum theories explain the distinct electronic properties of boundary modes localized near domain walls formed by interlayer electric field reversal, by interlayer stacking reversal, and by simultaneous reversal of both quantities. Boundary mode properties are related to topological transitions and gap closures which occur in the bulk Hamiltonian parameter space. The important role played by intervalley coupling effects not directly captured by the continuum model is addressed using lattice calculations for specific domain wall structures.
description: 6 pages, 7 figures
Sieversia montana
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: A. Cicer L. Cat. 77 und 424. Bis 1580m. 1:Le Rosel(Gams)^.- 2:Lens(J.); Montana(Coquoz);zwischen Ferden und Kippel(Chapuis). - 3:Lourtier (H.R. Landolt),. Val de Nendaz, mehrfach (J., Thommen, Oberson)Val d'Hérens:Nax (Pannatier)'vernamiège (idem)'Mase(J.),St-Martin (Kilcher),Euseigne (Pannatier) Villette:(J);zwischen Les Haudères und Chepec im Val de Ferpècle, 1580m (Villaret 1947);Les Pontis in Vald'Anniviers Kalpetran (sulger (Huber); ob); Herbriggen,Bürchen'1500 (Wilczek ^(Binz); Randa-Täsch);Törbel(StebTer, 143~5/) m;Stalden-K ~'(HuberJ I ^:" lpetr ^nZ 7n 1 (Becherer)^ _ terminen (Beauverd, Thellung). - 3a:Gondo,zweiStellen (Becherer); - 4:Bmn~(J~, 'Bmz).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Ices in planet-forming disks: Self-consistent ice opacities in disk models
Creators: name: Arabhavi, Aditya M.
name: Woitke, Peter
name: Cazaux, Stephanie M.
name: Kamp, Inga
name: Rab, Christian
name: Thi, Wing-Fai
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In cold and shielded environments, molecules freeze out on dust grain surfaces to form ices such as H2O, CO, CO2, CH4, CH3OH, and NH3. In protoplanetary disks, the exact radial and vertical ice extension depend on disk mass, geometry, and stellar UV irradiation. The goal of this work is to present a computationally efficient method to compute ice and bare-grain opacities in protoplanetary disk models consistently with the chemistry and to investigate the effect of ice opacities on the physico-chemical state and optical appearance of the disk. A matrix of Mie efficiencies is pre-calculated for different ice species and thicknesses, from which the position dependent opacities of icy grains are then interpolated. This is implemented in the PRODIMO code by a self-consistent solution of ice opacities and the local composition of ices, which are obtained from our chemical network. Locally, the opacity can change significantly, for example, an increase by a factor of more than 200 in the midplane, especially at UV and optical wavelengths, due to ice formation. This is mainly due to changes in the size distribution of dust grains resulting from ice formation. However, since the opacity only changes in the optically thick regions of the disk, the thermal disk structure does not change significantly. For the same reason, the spectral energy distributions computed with our disk models with ice opacities generally show only faint ice emission features at far-IR wavelengths. The ice absorption features are only seen in the edgeon orientation. The assumption made on how the ice is distributed across the grain size distribution influences the far-IR and millimeter slope of the SED. The ice features and their strengths are influenced by the ice power law and the type of chemistry. Our models predict stronger ice features for observations that can spatially resolve the disk, particularly in absorption.
description: Accepted for publication in A&A. 17 pages, 18 figures
Mueller Matrix Measurement of Electrospun Fiber Scaffolds for Tissue Engineering
Creators: name: Fricke, Dierk
name: Becker, Alexander
name: Jütte, Lennart
name: Bode, Michael
name: De Cassan, Dominik
name: Wollweber, Merve
name: Glasmacher, Birgit
name: Roth, Bernhard
Publisher: name: Basel : MDPI
Year: 2019
Subjects: subject: Mueller matrix
subject: tissue engineering
subject: electrospinning
subject: fiber alignment
subject: polycaprolactone
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: Electrospun fiber scaffolds are gaining in importance in the area of tissue engineering. They can be used, for example, to fabricate graded implants to mimic the tendon bone junction. For the grading of the tensile strength of the fiber scaffolds, the orientation of the fibers plays a major role. This is currently measured by hand in scanning electron microscope (SEM) images. In this work, a correlation between polarimetric information generated by measuring the Mueller matrix (MM) and the orientation of the fibers of electrospun fiber scaffolds is reported. For this, the MM of fiber scaffolds, which were manufactured with different production parameters, was measured and analyzed. These data were correlated with fiber orientation and mechanical properties, which were evaluated in an established manner. We found that by measurement of the MM the production parameters as well as the relative orientation of the fibers in space can be determined. Thus, the MM measurement is suitable as an alternative tool for non-contact, non-destructive determination of the production parameters and, thus, the degree of alignment of electrospun fiber scaffolds.
(224) and (264) configurations of lines
Creators: name: Cuntz, Michael Joachim
Publisher: name: Ljubljana : DMFA
Year: 2018
Subjects: subject: Arrangement of lines
subject: configuration of lines
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: We present a technique to produce arrangements of lines with nice properties. As an application, we construct (224) and (264) configurations of lines. Thus concerning the existence of geometric (n4) configurations, only the case n = 23 remains open.
The phase structure and effective action of 3D CDT at higher spatial genus
Creators: name: Brunekreef, Joren
name: Németh, Dániel
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We perform a detailed investigation of the phase structure and the semiclassical effective action of (2+1)-dimensional Causal Dynamical Triangulations (CDT) quantum gravity using computer simulations. On the one hand, we study the effect of enlarging the ensemble of triangulations by relaxing the simplicial manifold conditions in a controlled way. On the other hand, we cast a first look at CDT geometries with spatial topology beyond that of the sphere or torus. We measure the phase structure of the model for several triangulation ensembles and spatial topologies, finding evidence that the phase structure is qualitatively unaffected by these generalizations. Furthermore, we determine the effective action for the spatial volumes of the system, again varying the simplicial manifold conditions and the spatial topology. In all cases where we were able to gather sufficient statistics, we found the resulting effective action to be consistent with a minisuperspace action derived from continuum Einstein gravity. We interpret our overall results as evidence that 1) partially relaxing simplicial manifold conditions or changing the spatial genus does not affect the continuum limit of 3D CDT and that 2) increasing the spatial genus of the system likely does not influence the leading-order terms in the emergent effective action.
New Integrable Multi-Lévy-Index and Mixed Fractional Nonlinear Soliton Hierarchies
Creators: name: Yan, Zhenya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this letter, we present a simple and new idea to generate two types of novel integrable multi-Lévy-index and mix-Lévy-index (mixed) fractional nonlinear soliton hierarchies, containing multi-index and mixed fractional higher-order nonlinear Schrödinger (NLS) hierarchy, fractional complex modified Korteweg-de Vries (cmKdV) hierarchy, and fractional mKdV hierarchy. Their explicit forms can be given using the completeness of squared eigenfunctions. Moreover, we present their anomalous dispersion relations via their linearizations, and fractional multi-soliton solutions via the inverse scattering transform with matrix Riemann-Hilbert problems. These obtained fractional multi-soliton solutions may be useful to understand the related super-dispersion transports of nonlinear waves in multi-index fractional nonlinear media.
description: 8 pages, 0 figure
title: [Enthaltend des verstorbenen K. P. Oberst-Lieutenants F. W. Schmidt hinterlassene Forschungen über die Römerstrassen etc. im Rheinlande, bearbeitet aus den Aufzeichnungen des Verstorbenen von dessen Bruder Major a. D. E. Schmidt]
Creators: name: Schmidt, Friedrich Wilhelm
Publisher: name: University Library Heidelberg
Year: 2016

description: [nicht vorhanden / not available]
title: The Effects of Automation Transparency and Reliability on Task Shedding and Operator Trust
Creators: name: Lehman, William Everett
Publisher: name: Old Dominion University Libraries
Year: 2019

description: Because automation use is common in many domains, understanding how to design it to optimize human-automation system performance is vital. Well-calibrated trust ensures good performance when using imperfect automation. Two factors that may jointly affect trust calibration are automation transparency and perceived reliability. Transparency information that explains automated processes and analyses to the operator may help the operator choose appropriate times to shed task control to automation. Because operator trust is positively correlated with automation use, behaviors such as task shedding to automation can indicate the presence of trust. This study used a 2 (reliability; between) × 3 (transparency; within) split-plot design to study the effects that reliability and amount of transparency information have on operators’ subjective trust and task shedding behaviors. Results showed a significant effect of reliability on trust, in which high reliability resulted in more trust. There was no effect of transparency on trust. There was no effect of either reliability or transparency on task shedding frequency or time to task shed. This may be due to high workload of the primary task, restricting participants’ ability to utilize transparency information beyond the automation recommendation. Another influence on these findings was participant hesitance to task shed which could have influenced behavior regardless of automation reliability. These findings contribute to the understanding of automation trust and operator task shedding behavior. Consistent with literature, reliability increased trust. However, there was no effect of transparency, demonstrating the complexity of the relationship between transparency and trust. Participants demonstrated a bias to retain personal control, even with highly reliable automation and at the cost of time-out errors. Future research should examine the relationship between workload and transparency and the influence of task importance on task shedding.
title: The Deligne–Mumford and the Incidence Variety Compactifications of the Strata of ΩMg
title: Les compactifications de Deligne–Mumford et de la variété d’incidence des strates de ΩMg
titleType: AlternativeTitle
Creators: name: Gendron, Quentin
Publisher: name: Saint-Martin d'Heres : Institut Fourier
Year: 2018
Subjects: subject: Abelian differentials
subject: Riemann surfaces
subject: Moduli spaces
subject: Strata
subject: Compactification
subject: Kodaira dimension
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: The main goal of this work is to construct and study a reasonable compactification of the strata of the moduli space of abelian differentials. This allows us to compute the Kodaira dimension of some strata of the moduli space of abelian differentials. The main ingredients to study the compactifications of the strata are a version of the plumbing cylinder construction for differential forms and an extension of the parity of the connected components of the strata to the differentials on curves of compact type. We study in detail the compactifications of the hyperelliptic minimal strata and of the odd minimal stratum in genus three.
New solutions to the complex Ginzburg-Landau equations
Creators: name: Conte, Robert
name: Musette, Micheline
name: Wai, Ng Tuen
name: Chengfa, Wu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Other Condensed Matter (cond-mat.other)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35Q56, 78A25, 35Q60

description: The various régimes observed in the one-dimensional complex Ginzburg-Landau equation result from the interaction of a very small number of elementary patterns such as pulses, fronts, shocks, holes, sinks. We provide here three exact such patterns observed in numerical calculations but never found analytically. One is a quintic case localized homoclinic defect, observed by Popp et alii, the two others are bound states of two quintic dark solitons, observed by Afanasyev et alii.
description: 7 pages, 3 figures, to appear, Physical Review E
title: Change Management - Mainstream oder unverzichtbarer Werkzeugkasten?
Creators: name: Fuhrmans, Marc
Publisher: name: University Library Heidelberg
Year: 2016

description: Die Disziplin des Change Managements verspricht, es Organisationen zu ermöglichen, angestrebte Veränderungen effizient und mit möglichst wenig Reibungsverlusten durch interne Widerstände durchzuführen. In der Praxis wird sie dabei oft auf die durch sie zur Verfügung gestellten Werkzeuge und Methoden reduziert, obwohl die durch sie formulierten abstrahierenden Veränderungsmodelle einen nicht unwesentlichen Bestandteil der Disziplin ausmachen. Die vorliegende Arbeit versucht, die Verbreitung von Change Management an Bibliotheken zu bestimmen und durch empirische und begriffliche Untersuchungen als Zeiterscheinung zu charakterisieren sowie das Potential und mögliche Defizite der Disziplin herauszuarbeiten.
description: Perspektive Bibliothek, Bd. 5, Nr. 1 (2016), Beginn und Erscheinungsfrequenz: Nummer: 1, Jahr: 2012, Bände pro Jahr: 1
A pathway to ultracold bosonic 23Na39K ground state molecules
Creators: name: Voges, Kai K.
name: Gersema, Philipp
name: Hartmann, Torsten
name: Schulze, Torben A.
name: Zenesini, Alessandro
name: Ospelkaus, Silke
Publisher: name: London : IOP
Year: 2019
Subjects: subject: STIRAP
subject: molecular spectroscopy
subject: ultracold polar molecules
subject: bosonic quantum gases
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We spectroscopically investigate a pathway for the conversion of 23Na39K Feshbach molecules into rovibronic ground state molecules via stimulated Raman adiabatic passage. Using photoassociation spectroscopy from the diatomic scattering threshold in the a 3Σ+ potential, we locate the resonantly mixed electronically excited intermediate states |B1Π, v=8⟩ and |c3Σ+, v=30⟩ which, due to their singlet-triplet admixture, serve as an ideal bridge between predominantly a 3Σ+ Feshbach molecules and pure X 1Σ+ ground state molecules. We investigate their hyperfine structure and present a simple model to determine the singlet-triplet coupling of these states. Using Autler-Townes spectroscopy, we locate the rovibronic ground state of the 23Na39K molecule (X1Σ+, v=0, N=0⟩) and the second rotationally excited state N = 2 to unambiguously identify the ground state. We also extract the effective transition dipole moment from the excited to the ground state. Our investigations result in a fully characterized scheme for the creation of ultracold bosonic 23Na39K ground state molecules.
Cosmic voids and the kinetic analysis
Creators: name: Gurzadyan, V. G.
name: Fimin, N. N.
name: Chechetkin, V. M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The kinetic approach to the formation of the filaments in the large-scale matter distribution in the Universe is considered within the Vlasov formalism. The structures arise due to the self-consistent dynamics, along with the repulsive term in the modified Newtonian gravity which includes the cosmological constant. That modified gravity enables one to describe the Hubble tension as a result of two flows, the local and global ones. The criteria for formation of non--stationary semi-periodic structures in a system of gravitating particles described by Vlasov--Poisson equations are obtained in the case of that repulsive term. The obtained dispersion relations for the Vlasov equation in the vicinity of the singular point of the modified gravitational potential demonstrate the possibility of the emergence of filaments as coherent complex states of relative equilibrium in non--stationary systems as structures of low dimensions (walls), and voids between them, of scales (diameters) defined by the balance between the gravity and repulsive term of the cosmological constant.
description: 7 pages, 1 fig., A&A (in press)
Using Arabic Wordnet for semantic indexation in information retrieval system
Creators: name: Abderrahim, Mohammed Alaeddine
name: Abderrahim, Mohammed El Amine
name: Chikh, Mohammed Amine
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Retrieval (cs.IR)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: In the context of arabic Information Retrieval Systems (IRS) guided by arabic ontology and to enable those systems to better respond to user requirements, this paper aims to representing documents and queries by the best concepts extracted from Arabic Wordnet. Identified concepts belonging to Arabic WordNet synsets are extracted from documents and queries, and those having a single sense are expanded. The expanded query is then used by the IRS to retrieve the relevant documents searched. Our experiments are based primarily on a medium size corpus of arabic text. The results obtained shown us that there are a global improvement in the performance of the arabic IRS.
description: 6 pages,2 figures,7 tables
TEMPus VoLA: the Timed Epstein Multi-pressure Vessel at Low Accelerations
Creators: name: Capelo, Holly L.
name: Kühn, Jonas
name: Pommerol, Antoine
name: Piazza, Daniele
name: Brändli, Mathias
name: Cerubini, Romain
name: Jost, Bernhard
name: Bodénan, Jean-David
name: Planchet, Thomas
name: Spadaccia, Stefano
name: Schräpler, Rainer
name: Blum, Jürgen
name: Schönbächler, Maria
name: Mayer, Lucio
name: Thomas, Nicolas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The field of planetary system formation relies extensively on our understanding of the aerodynamic interaction between gas and dust in protoplanetary disks. Of particular importance are the mechanisms triggering fluid instabilities and clumping of dust particles into aggregates, and their subsequent inclusion into planetesimals. We introduce the Timed Epstein Multi-pressure vessel at Low Accelerations (TEMPusVoLA), which is an experimental apparatus for the study of particle dynamics and rarefied gas under micro-gravity conditions. This facility contains three experiments dedicated to studying aerodynamic processes, i) the development of pressure gradients due to collective particle-gas interaction, ii) the drag coefficients of dust aggregates with variable particle-gas velocity, iii) the effect of dust on the profile of a shear flow and resultant onset of turbulence. The approach is innovative with respect to previous experiments because we access an untouched parameter space in terms of dust particle packing fraction, and Knudsen, Stokes, and Reynolds numbers. The mechanisms investigated are also relevant for our understanding of the emission of dust from active surfaces such as cometary nuclei and new experimental data will help interpreting previous datasets (Rosetta) and prepare future spacecraft observations (Comet Interceptor). We report on the performance of the experiments, which has been tested over the course of multiple flight campaigns. The project is now ready to benefit from additional flight campaigns, to cover a wide parameter space. The outcome will be a comprehensive framework to test models and numerical recipes for studying collective dust particle aerodynamics under space-like conditions.
description: 26 pages, 24 figures; Accepted for publication in Review of Scientific Instruments
title: Editorial: Fragt nicht, was die Bibliothekare für eure Zeitschriften tun können
Creators: name: Hermann, Martin
name: Apel, Jochen
Publisher: name: University Library Heidelberg
Year: 2016

description: Perspektive Bibliothek, Bd. 5, Nr. 1 (2016), Beginn und Erscheinungsfrequenz: Nummer: 1, Jahr: 2012, Bände pro Jahr: 1
Multi-anionic and -cationic compounds: new high entropy materials for advanced Li-ion batteries
Creators: name: Wang, Qingsong
name: Sarkar, Abhishek
name: Wang, Di
name: Velasco, Leonardo
name: Azmi, Raheleh
name: Bhattacharya, Subramshu S.
name: Bergfeldt, Thomas
name: Düvel, Andre
name: Heitjans, Paul
name: Brezesinski, Torsten
name: Hahn, Horst
name: Breitung, Ben
Publisher: name: Cambridge : RSC
Year: 2019
Subjects: subject: Cobalt compounds
subject: Copper compounds
subject: Entropy
subject: Fluorine compounds
subject: Lithium-ion batteries
subject: Magnesium compounds
subject: Nickel compounds
subject: Sodium chloride
subject: Stabilization
subject: Transition metals
subject: Zinc compounds
subject: Dewey Decimal Classification::600 | Technik::690 | Hausbau, Bauhandwerk

description: In the present work, a new class of high entropy materials for energy storage applications is introduced. Multi-anionic and -cationic compounds are prepared by facile mechanochemistry using a recently designed multi-cationic transition-metal-based high entropy oxide as the precursor and LiF or NaCl as the reactant, leading to formation of lithiated or sodiated materials. Notably, the Li-containing entropy-stabilized oxyfluoride described herein (Lix(Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)OFx) exhibits a working potential of 3.4 V vs. Li+/Li, enabling its use as a cathode active material. Unlike conventional (non-entropy-stabilized) oxyfluorides, this new material shows enhanced Li storage properties due to entropy stabilization, which, in general, facilitates tailoring the cycling performance by varying the constituent elements in yet unprecedented ways. In addition, we demonstrate that the concept of entropy stabilization is also applicable to Na-containing oxychlorides with a rock-salt structure, thus paving the way toward development of (next-generation) post-Li battery technologies.
Erratum to: A variational approach to a stationary free boundary problem modeling MEMS
Creators: name: Laurençot, Philippe
name: Walker, Christoph
Publisher: name: Les Ulis : EDP Sciences
Year: 2019
Subjects: subject: MEMS
subject: stationary solutions
subject: constrained minimization
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: An incomplete argument in the proof of Theorem 3.4 from Ph. Laurençot and Ch. Walker [ESAIM: COCV 22 (2016) 417–438] is corrected.
Representations of orbifold groupoids
Creators: name: Kalisnik, Jure
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 22A22, 22D10

description: Orbifold groupoids have been recently widely used to represent both effective and ineffective orbifolds. We show that every orbifold groupoid can be faithfully represented on a continuous family of finite dimensional Hilbert spaces. As a consequence we obtain the result that every orbifold groupoid is Morita equivalent to the translation groupoid of an action of a bundle of compact topological groups.
description: 15 pages
Efficient synthesis of novel bis(dihydropyrano[2,3c]pyrazoles), bis(4H-chromenes) and bis(dihydropyrano[3,2-c]chromenes) with amide functionality
Creators: name: Abdella, Amna M.
name: Abdelmoniem, Amr M.
name: Butenschön, Holger
name: Abdelhamid, Ismail A.
name: Elwahy, Ahmed H.M.
Publisher: name: Zürich : ARKAT
Year: 2019
Subjects: subject: Bis(pyrano[2,3-c]pyrazole)
subject: bis(chromene)
subject: bis(pyrano[3,2-c]chromene)
subject: amide linkages
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: A synthesis of novel bis(1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitriles), bis(4H-chromene-3-carbonitriles) and bis(dihydropyrano[3,2-c]chromenes), which are linked to aliphatic spacers via amide linkages was achieved via multicomponent reactions (MCR) of the appropriate bis-aldehyde with two equivalents of both of malononitrile and 3-methylpyrazol-5-one, dimedone or 4-hydroxycoumarin in a basic solution.
Untersuchungen zur Bedeutung der S-Transnitrosylierungs-Reaktion für die Bildung, den Metabolismus und die Vermittlung der biologischen Aktivitäten von NO und S-Nitroso-Substanzen
Creators: name: Sandmann, Jörg
Publisher: name: Hannover : Universität Hannover
Year: 2000
Subjects: subject: S-transnitrosylation reaction
subject: S-Nitroso compounds
subject: asymmetric dimethylarginine
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Higgs Bosons in supersymmetric U(1)' models with CP Violation
Creators: name: Frank, Mariana
name: Selbuz, Levent
name: Solmaz, Levent
name: Turan, Ismail
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the Higgs sector of the U(1)'-extended MSSM with CP violation. This is an extension of the MSSM Higgs sector by one singlet field, introduced to generate the μterm dynamically. We are particularly interested in non-standard decays of Higgs particles, especially of the lightest one, in the presence of CP violating phases for μ_{eff} and the soft parameters. We present analytical expressions for neutral and charged Higgs bosons masses at tree and one-loop levels, including contributions from top and bottom scalar quark sectors. We then study the production and decay channels of the neutral Higgs for a set of benchmark points consistent with low energy data and relic density constraints. Numerical simulations show that a Higgs boson lighter than 2m_W can decay in a quite distinctive manner, including invisible modes into two neutralinos (h->χ^0χ^0) up to 50% of the time, when kinematically allowed. The branching ratio into h->bb, the dominant decay in the SM, is reduced in some U(1)' models and enhanced in others, while the branching ratios for the decays h -> τ+ τ-, h -> WW^* and h -> Z Z^*-> 4l are always reduced with respect to their SM expectations. This possibility has important implications for testing the U(1)' model both at the LHC and later at the ILC.
description: 35 pages, 5 tables, 4 figures
Multiple object tracking with context awareness
Creators: name: Leal-Taixé, Laura
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Multiple people tracking
subject: linear programming
subject: social force model
subject: Kamerabasierte Verfolgung
subject: lineare Programmierung
subject: Sozial- und Gruppenverhalten
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: [no abstract]
An intermediate polar candidate toward the Galactic plane
Creators: name: Mondal, Samaresh
name: Ponti, Gabriele
name: Haberl, Frank
name: Anastasopoulou, Konstantina
name: Campana, Sergio
name: Mori, Kaya
name: Hailey, Charles J.
name: Rea, Nanda
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: For the past decade, it has been suggested that intermediate polars (IPs), a subclass of magnetic cataclysmic variables (CVs), are one of the main contributors to the hard diffuse X-ray emission from the Galactic center (GC) and Galactic ridge. In our ongoing \emph{XMM-Newton} survey of the central region of the Galactic disk ($20^\circ\times2^\circ$), we detected a persistent IP candidate, $1.7^\circ$ away from the GC. In this work, we better characterize the behavior of this source by looking at the new and archival XMM-Newton data. We performed a detailed X-ray spectral modeling of the source. Furthermore, we searched for X-ray pulsations in the light curve as well as its counterpart at other wavelengths. The XMM-Newton spectrum (0.8--10 keV) of the source is described by a partial covering collisionally ionized diffuse gas with plasma temperature $kT=15.7^{+20.9}_{-3.6}$ keV. In addition, the spectrum shows the presence of iron lines at $E=6.44$, 6.65, and 6.92 keV with equivalent widths of $194^{+89}_{-70}$, $115^{+79}_{-75}$, and $98^{+93}_{-74}$ eV, respectively. The X-ray light curve shows a coherent modulation with a period of $P=432.44\pm0.36$ s, which we infer is the spin period of the white dwarf. The white dwarf mass estimated from fitting a physical model to the spectrum results in $M_{\rm WD}=1.05^{+0.16}_{-0.21}\ M_{\odot}$. We were able to find a likely optical counterpart in the Gaia catalog with a G magnitude of 19.26, and the distance to the source derived from the measured Gaia parallax is $\sim$4.3 kpc. We provide an improved source localization with subarcsec accuracy. The spectral modeling of the source indicates the presence of intervening circumstellar gas, which absorbs the soft X-ray photons. The measured equivalent width of the iron lines and the detection of the spin period in the light curve are consistent with those from IPs.
description: 6 pages, 5 figures, accepted for publication in A&A
Estimates for the Thermal Width of Heavy Quarkonia in Strongly Coupled Plasmas from Holography
Creators: name: Finazzo, Stefano I.
name: Noronha, Jorge
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The gauge/gravity duality is used to investigate the imaginary part of the heavy quark potential (defined via the rectangular Wilson loop) in strongly coupled plasmas. This quantity can be used to estimate the width of heavy quarkonia in a plasma at strong coupling. In this paper the thermal worldsheet fluctuation method, proposed in [J.Noronha and A.Dumitru, Phys.\ Rev.\ Lett.\ {\bf 103}, 152304 (2009)], is revisited and general conditions for the existence of an imaginary part for the heavy quark potential computed within classical gravity models are obtained. We prove a general result that establishes the connection between this imaginary part of the potential determined holographically and the area law displayed by the Wilson loop in the vacuum of confining gauge theories. We also determine the imaginary part of the heavy quark potential in a strongly coupled plasma dual to Gauss-Bonnet gravity. This provides an estimate of how the thermal width of heavy quarkonia changes with the shear viscosity to entropy density ratio, $η/s$, at strong coupling.
description: 45 pages, 20 figures; new references and appendix added
Groupoid representations and modules over the convolution algebras
Creators: name: Kalisnik, Jure
Publisher: name: arXiv
Year: 2008
Subjects: subject: K-Theory and Homology (math.KT)
subject: Differential Geometry (math.DG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 16D40, 16D90, 22A22

description: The classical Serre-Swan's theorem defines a bijective correspondence between vector bundles and finitely generated projective modules over the algebra of continuous functions on some compact Hausdorff topological space. We extend these results to obtain a correspondence between the category of representations of an etale Lie groupoid and the category of modules over its convolution algebra that are of finite type and of constant rank. Both of these constructions are functorially defined on the Morita bicategory of etale Lie groupoids and the given correspondence represents a natural equivalence between them.
Shadow and quasinormal modes of the Kerr-Newman-Kiselev-Letelier black hole
Creators: name: Atamurotov, Farruh
name: Hussain, Ibrar
name: Mustafa, G.
name: Jusufi, Kimet
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the null geodesics and the shadow cast by the Kerr-Newman-Kiselev-Letelier (KNKL) black hole for the equation of state parameter $ω_q=-2/3$ and for different values of the spacetime parameters, including the quintessence parameter $γ$, the cloud of string (CS) parameter $b$, the spin parameter $a$ and the charge $Q$ of the black hole. We notice that for the increasing values of the parameters $γ$ and $b$ the size of the shadow of the KNKL black hole increases and consequently the strength of the gravitational field of the black hole increases. On the other hand with increase in the charge $Q$ of the black hole the size of the shadow of the black hole decreases. Further with the increase in the values of the spin parameter $a$ of the KNKL black hole, we see that the distortion of the shadow of the black hole becomes more prominent. Moreover we use the data released by the Event Horizon Telescope (EHT) collaboration, to restrict the parameters $b$ and $γ$ for the KNKL black hole, using the shadow cast by the KNKL black hole. To this end, we also explore the relation between the typical shadow radius and the equatorial and polar quasinormal mods (QNMs) for the KNKL black hole and extend this correspondence to non-asymptotically flat spacetimes. We also study the emission energy rate from the KNKL black hole for the various spacetime parameters, and observe that it increases for the increasing values of both the parameters $γ$ and $b$ for fixed charge-to-mass and spin-to-mass ratios of the KNKL black hole. Finally, we investigate the effects of plasma on the photon motion, size and shape of the shadow cast by the KNKL black hole...
description: 16 pages, 7 figures, 2 tables. Accepted for publication in Eur. Phys. J. C