cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Stellar magnetic field parameters from a Bayesian analysis of high-resolution spectropolarimetric observations
Creators: name: Petit, V.
name: Wade, G. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this paper we describe a Bayesian statistical method designed to infer the magnetic properties of stars observed using high-resolution circular spectropolarimetry in the context of large surveys. This approach is well suited for analysing stars for which the stellar rotation period is not known, and therefore the rotational phases of the observations are ambiguous. The model assumes that the magnetic observations correspond to a dipole oblique rotator, a situation commonly encountered in intermediate and high-mass stars. Using reasonable assumptions regarding the model parameter prior probability density distributions, the Bayesian algorithm determines the posterior probability densities corresponding to the surface magnetic field geometry and strength by performing a comparison between the observed and computed Stokes V profiles. Based on the results of numerical simulations, we conclude that this method yields a useful estimate of the surface dipole field strength based on a small number (i.e. 1 or 2) of observations. On the other hand, the method provides only weak constraints on the dipole geometry. The odds ratio, a parameter computed by the algorithm that quantifies the relative appropriateness of the magnetic dipole model versus the non-magnetic model, provides a more sensitive diagnostic of the presence of weak magnetic signals embedded in noise than traditional techniques. To illustrate the application of the technique to real data, we analyse seven ESPaDOnS and Narval observations of the early B-type magnetic star LP Ori. Insufficient information is available to determine the rotational period of the star and therefore the phase of the data; hence traditional modelling techniques fail to infer the dipole strength. In contrast, the Bayesian method allows a robust determination of the dipole polar strength, $B_d=911^{+138}_{-244}$ G.
description: Accepted for publication in Monthly Notices of the Royal Astronomical Society
Inhalt
Creators: name: Redaktion, Die
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2020

description: -
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 75 Nr. 1 (1997)
Traveling Baseball Players' Problem in Korea
Creators: name: Jeong, Hyang Min
name: Kim, Sang-Woo
name: Kim, Aaram J.
name: Choi, Younguk
name: Eun, Jonghyoun
name: Kim, Beom Jun
Publisher: name: arXiv
Year: 2012
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We study the so-called the traveling tournament problem (TTP), to find an optimal tournament schedule. Differently from the original TTP, in which the total travel distance of all the participants is the objective function to minimize, we instead seek to maximize the fairness of the round robin tournament schedule of the Korean Baseball League. The standard deviation of the travel distances of teams is defined as the energy function, and the Metropolis Monte-Carlo method combined with the simulated annealing technique is applied to find the ground state configuration. The resulting tournament schedule is found to satisfy all the constraint rules set by the Korean Baseball Organization, but with drastically increased fairness in traveling distances.
description: 8 pages, 4 figures
Transformed Gaussian Markov Random Fields and Spatial Modeling
Creators: name: Prates, Marcos O.
name: Dey, Dipak K.
name: Willig, Michael R.
name: Yan, Jun
Publisher: name: arXiv
Year: 2012
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: The Gaussian random field (GRF) and the Gaussian Markov random field (GMRF) have been widely used to accommodate spatial dependence under the generalized linear mixed model framework. These models have limitations rooted in the symmetry and thin tail of the Gaussian distribution. We introduce a new class of random fields, termed transformed GRF (TGRF), and a new class of Markov random fields, termed transformed GMRF (TGMRF). They are constructed by transforming the margins of GRFs and GMRFs, respectively, to desired marginal distributions to accommodate asymmetry and heavy tail as needed in practice. The Gaussian copula that characterizes the dependence structure facilitates inferences and applications in modeling spatial dependence. This construction leads to new models such as gamma or beta Markov fields with Gaussian copulas, which can be used to model Poisson intensity or Bernoulli rate in a spatial generalized linear mixed model. The method is naturally implemented in a Bayesian framework. We illustrate the utility of the methodology in an ecological application with spatial count data and spatial presence/absence data of some snail species, where the new models are shown to outperform the traditional spatial models. The validity of Bayesian inferences and model selection are assessed through simulation studies for both spatial Poisson regression and spatial Bernoulli regression.
description: 19 pages, 2 figures, 6 tables
,Freies Germanien'/,Germania liberal' - Zur Genese eines historischen Begriffs
Creators: name: Neumaier, Helmut
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2020

description: -
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 75 Nr. 1 (1997)
Fast Accelerated Failure Time Modeling for Case-Cohort Data
Creators: name: Chiou, Steven
name: Kang, Sangwook
name: Yan, Jun
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computation (stat.CO)
subject: FOS: Computer and information sciences

description: Semiparametric accelerated failure time (AFT) models directly relate the predicted failure times to covariates and are a useful alternative to models that work on the hazard function or the survival function. For case-cohort data, much less development has been done with AFT models. In addition to the missing covariates outside of the sub-cohort in controls, challenges from AFT model inferences with full cohort are retained. The regression parameter estimator is hard to compute because the most widely used rank-based estimating equations are not smooth. Further, its variance depends on the unspecified error distribution, and most methods rely on computationally intensive bootstrap to estimate it. We propose fast rank-based inference procedures for AFT models, applying recent methodological advances to the context of case-cohort data. Parameters are estimated with an induced smoothing approach that smooths the estimating functions and facilitates the numerical solution. Variance estimators are obtained through efficient resampling methods for nonsmooth estimating functions that avoids full blown bootstrap. Simulation studies suggest that the recommended procedure provides fast and valid inferences among several competing procedures. Application to a tumor study demonstrates the utility of the proposed method in routine data analysis.
description: submitted
Bericht über die Integrieranlage 'Integromat' des Instituts für Angewandte Mathematik der Universität Hamburg
Creators: name: Eggers, Klaus
Publisher: name: TUHH Universitätsbibliothek
Year: 1953
Subjects: classificationCode: 620
subject: Ingenieurwissenschaften
classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Bericht über die Integrieranlage 'Integromat' des Instituts für Angewandte Mathematik der Universität Hamburg
Die Johann Heinrich Schönfeld-Ausstellung in Ulm
Creators: name: Bushart, Bruno
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2020

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Bd. 20 Nr. 12 (1967): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Electron spin resonance of nitrogen-vacancy centers in optically trapped nanodiamonds
Creators: name: Horowitz, Viva R.
name: Alemán, Benjamín J.
name: Christle, David J.
name: Cleland, Andrew N.
name: Awschalom, David D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using an optical tweezers apparatus, we demonstrate three-dimensional control of nanodiamonds in solution with simultaneous readout of ground-state electron-spin resonance (ESR) transitions in an ensemble of diamond nitrogen-vacancy (NV) color centers. Despite the motion and random orientation of NV centers suspended in the optical trap, we observe distinct peaks in the measured ESR spectra qualitatively similar to the same measurement in bulk. Accounting for the random dynamics, we model the ESR spectra observed in an externally applied magnetic field to enable d.c. magnetometry in solution. We estimate the d.c. magnetic field sensitivity based on variations in ESR line shapes to be ~50 microTesla/Hz^1/2. This technique may provide a pathway for spin-based magnetic, electric, and thermal sensing in fluidic environments and biophysical systems inaccessible to existing scanning probe techniques.
description: 29 pages, 13 figures for manuscript and supporting information
Nice labeling problem for event structures: a counterexample
Creators: name: Chepoi, Victor
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: In this note, we present a counterexample to a conjecture of Rozoy and Thiagarajan from 1991 (called also the nice labeling problem) asserting that any (coherent) event structure with finite degree admits a labeling with a finite number of labels, or equivalently, that there exists a function $f: \mathbb{N} \mapsto \mathbb{N}$ such that an event structure with degree $\le n$ admits a labeling with at most $f(n)$ labels. Our counterexample is based on the Burling's construction from 1965 of 3-dimensional box hypergraphs with clique number 2 and arbitrarily large chromatic numbers and the bijection between domains of event structures and median graphs established by Barthélemy and Constantin in 1993.
Über eine angenäherte Behandlung des Tauchens und Stampfens von Tragflächensystemen in regelmäßigem Seegang
Creators: name: Weinblum, Georg
Publisher: name: TUHH Universitätsbibliothek
Year: 1958
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Über eine angenäherte Behandlung des Tauchens und Stampfens von Tragflächensystemen in regelmäßigem Seegang
Apparent Horizons with Nontrivial Topology and the Hyperhoop Conjecture in Six-Dimensional Space-Times
Creators: name: Kurata, Tomohiro
name: Nakayama, Hirotaka
name: Okamoto, Takahiro
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the validity of the hyperhoop conjecture, which claims to determine a necessary and sufficient condition for the formation of black hole horizons in higher-dimensional space-times. Here we consider momentarily static, conformally flat initial data sets each describing a gravitational field of uniform massive k-sphere sources, for k=1,2, on the five-dimensional Cauchy surface. The numerical result shows the validity of the hyperhoop conjecture for a wide range of model parameters. We also confirm for the first time the existence of an apparent horizon homeomorphism to S**2 x S**2 or S**1 x S**3, which is a higher-dimensional generalization of the black ring.
description: 17 pages, 12 figures. to appear in Phys. Rev. D
MS3 Four deliberative exercises to identify acceptable normative practices within a progressive interpretation of the legal framework
Creators: name: Meletti, Bartolomeo
name: van Gompel, Stef
Publisher: name: Zenodo
Year: 2021
Subjects: copyright
creative industries

description: Task 4.3 aims to produce four deliberative exercises to identify acceptable normative practices within a progressive interpretation of the legal framework in the Netherlands and the United Kingdom (UK). These were preceded by four workshops – described in this milestone report MS3 – to map issues encountered by two stakeholder groups. Task 4.3 Developing best practice codes for creative audiovisual re-use adopts a bottom-up, participatory research method in order to provide contextualised evidence and guidance on how copyright exceptions are being perceived and used in practice by specific AV sectors of certain countries. An established methodology for developing best practice codes1 is adapted to the European context in three steps. (1) Mapping of issues that specific communities encounter; (2) formal deliberative exercises; (3) drafting of codes. Each step involves co-production with creative and cultural practitioners in the relevant AV communities. As part of step 1 of the project, four online deliberative workshops were undertaken, one for each community of documentary filmmakers and of curators and creators of immersive experiences in the two jurisdictions under consideration. During these workshops, participants deliberated on the most pressing copyright issues they face when making documentary films or creating immersive experiences, respectively. The online workshops provided direct input for the four issue reports produced for MS5 and ultimately for D4.10 – Issue reports on how copyright exceptions and other permitted uses that are relevant for documentary filmmakers and immersive digital heritage practitioners are understood in the Netherlands and the UK. These four online workshops are a milestone towards D4.11 – two codes of best practices in relation to copyright in the AV selected sectors. Based on the issues identified through MS3, the next steps of Task 4.3 will be to engage in formal deliberation exercises using social science standards to identify shared principles and acceptable norms within the communities under consideration; and to draft sector-specific codes of best practices that reflect such principles and norms.
Finite-size scaling tests for spectra in SU(3) lattice gauge theory coupled to 12 fundamental flavor fermions
Creators: name: DeGrand, Thomas
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: I carry out a finite-size scaling study of the correlation length in SU(3) lattice gauge theory coupled to 12 fundamental flavor fermions, using recent data published by Fodor, Holland, Kuti, Nogradi and Schroeder. I make the assumption that the system is conformal in the zero-mass, infinite volume limit, that scaling is violated by both nonzero fermion mass and by finite volume, and that the scaling function in each channel is determined self-consistently by the data. From several different observables I extract a common exponent for the scaling of the correlation length xi with the fermion mass m_q, xi proportional to m_q to the power -1/y_m, with y_m ~ 1.35. Shortcomings of the analysis are discussed.
description: 8 pages, 3 figures
Extension of Minimal Fermionic Dark Matter Model : A Study with Two Higgs Doublet Model
Creators: name: Banik, Amit Dutta
name: Majumdar, Debasish
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We explore a fermionic dark matter model with a possible extension of Standard Model (SM) of particle physics into two Higgs doublet model. Higgs doublets couple to the singlet fermionic dark matter (FDM) through a non renormalisable coupling providing a new physics scale. We explore the viability of such dark matter candidate and constrain the model parameter space by collider serach, relic density of DM, direct detection measurements of DM-nucleon scattreing cross-section and with the experimentally obtained results from indirect search of dark matter.
description: 22 pages, 17 new png figures, Title changed, new references added, major revision
Strange Nonchaotic Oscillations in The Quasiperiodically Forced Hodgkin-Huxley Neuron
Creators: name: Lim, Woochang
name: Kim, Sang-Yoon
Publisher: name: arXiv
Year: 2011
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: We numerically study dynamical behaviors of the quasiperiodically forced Hodgkin-Huxley neuron and compare the dynamical responses with those for the case of periodic stimulus. In the periodically forced case, a transition from a periodic to a chaotic oscillation was found to occur via period doublings in previous numerical and experimental works. We investigate the effect of the quasiperiodic forcing on this period-doubling route to chaotic oscillation. In contrast to the case of periodic forcing, new type of strange nonchaotic (SN) oscillating states (that are geometrically strange but have no positive Lyapunov exponents) are found to exist between the regular and chaotic oscillating states as intermediate ones. Their strange fractal geometry leads to aperiodic "complex" spikings. Various dynamical routes to SN oscillations are identified, as in the quasiperiodically forced logistic map. These SN spikings are expected to be observed in experiments of the quasiperiodically forced squid giant axon.
description: 20 pages, 6 figures
Copula Modeling for Data with Ties
Creators: name: Li, Yan
name: Li, Yang
name: Qin, Yichen
name: Yan, Jun
Publisher: name: arXiv
Year: 2016
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Copula modeling has gained much attention in many fields recently with the advantage of separating dependence structure from marginal distributions. In real data, however, serious ties are often present in one or multiple margins, which cause problems to many rank-based statistical methods developed under the assumption of continuous data with no ties. Simple methods such as breaking the ties at random or using average rank introduce independence into the data and, hence, lead to biased estimation. We propose an estimation method that treats the ranks of tied data as being interval censored and maximizes a pseudo-likelihood based on interval censored pseudo-observations. A parametric bootstrap procedure that preserves the observed tied ranks in the data is adapted to assess the estimation uncertainty and perform goodness-of-fit tests. The proposed approach is shown to be very competitive in comparison to the simple treatments in a large scale simulation study. Application to a bivariate insurance data illustrates the methodology.
The meaning of Maracatu : history, religion and performance in Maracatu Nação Estrela Brilhante do Recife
Creators: name: Crandell, Jesse Allan
Publisher: name: The University of Texas at Austin
Year: 2020
Subjects: Maracatu nação
Estrela Brilhante
Maracatu

description: This is an investigation of the cultural practice of maracatu nação in Recife, Brazil, through one of its oldest existing and most recognized organizations, Maracatu Nacão Estrela Brilhante do Recife. As indicated in the subtitle, the three main themes investigated are the history, religion and performance of Estrela Brilhante. The first chapter exploring the history covers four distinct epochs and incarnations of Estrela Brilhante in four different locations in Recife. It is based on literature by former batuqueiras in Estrela Brilhante who published histories of the nação in the Ethnomusicology program at the Federal University of Pernambuco, and the testimonies of current leaders and members. The second chapter examines the relationship of the nação to the Candomblé Nagô and Jurema religions, and how the performance represents or reflects them. It is based on interviews conducted in July and August 2019 with these current leaders and members. The third chapter narrates Estrela Brilhante’s champion performance in the 2019 Carnaval Recife Maracatu de Baque Virado Grupo Especial competition. It is based on footage and photographs that I took while accompanying the procession in their performance, and information provided by the performers in response to my questions since. Along with these central themes, I inquire about the current political and social climate in Recife and their impact on the nação. These include issues of racism, discrimination, religious persecution, cultural dissemination and appropriation, the recognition of maracatu nação as Intangible Cultural Heritage by UNESCO and IPHAN in 2014, and the recent right-wing shifts in the federal government of Brazil. The respondents are also asked to share what maracatu means to them; how, when and why they have participated in the nação; and how participation has benefitted themselves, others, society and humanity. The work is inspired by teachers in the nação who have taught myself and others who perform the music of Estrela Brilhante and maracatu nação in Austin, Texas. These teachers have implored us to go to the roots of the practice, the communities who produced it, to inform ourselves and others about what it means, and the religion, identity and cultural resistance it embodies.
Sozial-emotionales Lernen durch Rough and Tumble Play: Möglichkeiten für die Psychomotorik
Creators: name: Zena, Mirijana
name: Rohr, Joana
Publisher: name: Zenodo
Year: 2023
Subjects: Psychomotorik
Psychomotoriktherapie
Sozial-emotionales Lernen
Bachelorarbeit

description: Aufgrund der ambivalenten Ansichten zu Rough and Tumble Play (RTP) und den daraus resultierenden Unsicherheiten im Umgang mit RTP seitens der Eltern, Schulen wie auch der Psychomotorik, soll diese Bachelorarbeit eine strukturelle Übersicht und Klarheit für künftiges Handeln schaffen. Die sozial-emotionale Entwicklung ist ein Fachgebiet der Psychomotorik, weswegen diese Bachelorarbeit sich auf RTP im Zusammenhang mit sozial-emotionalem Lernen bei Kindern ab dem Vorschulalter fokussiert. Das vorliegende Literaturreview untersucht den aktuellen Forschungsstand des Einflusses von RTP auf die sozial-emotionale Entwicklung von Kindern ab dem Vorschulalter. Die Facetten der Thematik werden anhand des Wissensstandes der Fachliteratur aufgezeigt. Das sozial emotionale Lernen (SEL) wird nach CASEL umschrieben. Das Literaturreview enthält qualitative und quantitative Studien. Die Ergebnisse zeigen, dass es beim RTP geschlechterspezifische Unterschiede gibt und es vor allem bei den Knaben eine beliebte Spielform ist. Grundsätzlich gibt es einen Zusammenhang zwischen RTP und sozialemotionalem Lernen. Für das sozial-emotionale Lernen bei Kindern ab dem Vorschulalter kann RTP je nach Geschlecht, Alter und Qualität des RTP als förderlich eingestuft werden. Für die Psychomotoriktherapie bedeutet dies, dass RTP das sozial-emotionale Lernen unterstützen kann. Anhand der Befunde unseres Reviews lassen sich Rahmenbedingungen und therapeutische Verhaltensweisen ableiten, die für das förderliche Einsetzen von RTP in der Psychomotorik gegeben sein müssen. Im Ausblick steht das vermehrte Durchführen von RTP im therapeutischen Setting, in der Schule oder zwischen Eltern und Kind. Es besteht Forschungsbedarf für RTP im Jungendalter sowie der Nutzen von RTP mit einer weiblichen Bezugsperson.
Experimental Indicators of Accretion Processes in Active Galactic Nuclei
Creators: name: Eckart, A.
name: Valencia-S., M.
name: Shahzamanian, B.
name: Zajacek, M.
name: Moser, L.
name: Busch, G.
name: Parsa, M.
name: Subroweit, M.
name: Peissker, F.
name: Sabha, N.
name: Hosseini, S. E.
name: Horrobin, M.
name: Straubmeier, C.
name: Fazeli, N.
name: Borkar, A.
name: Kunneriath, D.
name: Karas, V.
name: Rauch, C.
name: Britzen, S.
name: Zensus, A.
name: Garcia-Marin, M.
name: Rashed, Y. E.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Bright Active Galactic Nuclei are powered by accretion of mass onto the super massive black holes at the centers of the host galaxies. For fainter objects star formation may significantly contribute to the luminosity. We summarize experimental indicators of the accretion processes in Active Galactic Nuclei (AGN), i.e., observable activity indicators that allow us to conclude on the nature of accretion. The Galactic Center is the closest galactic nucleus that can be studied with unprecedented angular resolution and sensitivity. Therefore, here we also include the presentation of recent observational results on Sagittarius A* and the conditions for star formation in the central stellar cluster. We cover results across the electromagnetic spectrum and find that the Sagittarius A* (SgrA*) system is well ordered with respect to its geometrical orientation and its emission processes of which we assume to reflect the accretion process onto the super massive black hole.
description: 16 pages, 4 figures, conference proceeding: Accretion Processes in Cosmic Sources - APCS2016 - 5-10 September 2016, Saint Petersburg, Russia
Numerical study of goal-oriented error control for stabilized finite element methods
Creators: name: Bruchhäuser, Marius Paul
name: Schwegler, Kristina
name: Bause, Markus
Publisher: name: arXiv
Year: 2018
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: The efficient and reliable approximation of convection-dominated problems continues to remain a challenging task. To overcome the difficulties associated with the discretization of convection-dominated equations, stabilization techniques and a posteriori error control mechanisms with mesh adaptivity were developed and studied in the past. Nevertheless, the derivation of robust a posteriori error estimates for standard quantities and in computable norms is still an unresolved problem and under investigation. Here we combine the Dual Weighted Residual (DWR) method for goal-oriented error control with stabilized finite element methods. By a duality argument an error representation is derived on that an adaptive strategy is built. The key ingredient of this work is the application of a higher order discretization of the dual problem in order to make a robust error control for user-chosen quantities of interest feasible. By numerical experiments in 2D and 3D we illustrate that this interpretation of the DWR methodology is capable to resolve layers and sharp fronts with high accuracy and to further reduce spurious oscillations.
description: arXiv admin note: text overlap with arXiv:1601.06544
Spin and orbital hybridization at specifically nested Fermi surfaces in URu$_2$Si$_2$
Creators: name: Oppeneer, Peter M.
name: Elgazzar, Saad
name: Rusz, Jan
name: Feng, Qingguo
name: Durakiewicz, Tomasz
name: Mydosh, John A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The Fermi surface (FS) nesting properties of URu$_2$Si$_2$ are analyzed with particular focus on their implication for the mysterious hidden order phase. We show that there exist two Fermi surfaces that exhibit a strong nesting at the antiferromagnetic wavevector, $\boldsymbol{Q}_0$=(0,\,0,\,1). The corresponding energy dispersions fulfill the relation $ε_{1}(\boldsymbol{k})$=$- ε_{2} (\boldsymbol{k}\pm \boldsymbol{Q}_0)$ at eight FS hotspot lines. The spin-orbital characters of the involved $5f$ states are {\it distinct} ($j_z$=$\pm$5/2 {\it vs.} $\pm$3/2) and hence the degenerate Dirac crossings are symmetry protected in the nonmagnetic normal state. Dynamical symmetry breaking through an Ising-like spin and orbital excitation mode with $Δj_z$=$\pm$1 induces a hybridization of the two states, causing substantial FS gapping. Concomitant spin and orbital currents in the uranium planes give rise to a rotational symmetry breaking.
description: 5 pages, 3 figures
Long-range Scattering Matrix for Schrödinger-type Operators
Creators: name: Nakamura, Shu
Publisher: name: arXiv
Year: 2018
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 58J50, 35P25, 81U05

description: We show that the scattering matrix for a class of Schrödinger-type operators with long-range perturbations is a Fourier integral operator with the phase function which is the generating function of the modified classical scattering map.
Active and Cooperative Learning Paths in the Pigelleto's Summer School of Physics
Creators: name: Benedetti, Roberto
name: Mariotti, Emilio
name: Montalbano, Vera
name: Porri, Antonella
Publisher: name: arXiv
Year: 2012
Subjects: subject: Physics Education (physics.ed-ph)
subject: Popular Physics (physics.pop-ph)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Since 2006, the Pigelleto's Summer School of Physics is an important appointment for orienting students toward physics. It is organized as a full immersion school on actual topics in physics or in fields rarely pursued in high school, i.e. quantum mechanics, new materials, energy resources. The students, usually forty, are engaged in many activities in laboratory and forced to become active participants. Furthermore, they are encouraged in cooperating in small groups in order to present and share the achieved results. In the last years, the school became a training opportunity for younger teachers which are involved in programming and realization of selected activities. The laboratory activities with students are usually supervised by a young and an expert teacher in order to fix the correct methodology.
description: 3 pages, Twelfth International Symposium Frontiers of Fundamental Physics (FFP12), Udine 21-23 November 2011
title: Projekt DISCUS (Developing Information Skills & Competence for University Students) : Abschlussbericht
title: Project DISCUS (Developing Information Skills & Competence for University Students)
titleType: AlternativeTitle
Creators: name: Bieler, Detlev
name: Hapke, Thomas
name: Marahrens, Oliver
Publisher: name: TUHH Universitätsbibliothek
Year: 2005
Subjects: subject: information literacy
subject: e-learning
subject: online tutorial
classificationCode: 020
subject: Bibliotheks- und Informationswissenschaft
subject: Informationskompetenz
subject: E-Learning
subject: Lernprogramm
classificationCode: K.3.1
subject: Computer Uses in Education
classificationCode: K.3.2
subject: Computer and Information Science Education
classificationCode: H.3.7
subject: Digital Libraries (NEW)

description: Das Projekt DISCUS (Developing Information Skills & Competence for University Students) hilft, den roten Faden durch die Informationsvielfalt zu finden und weiter zu verfolgen. Das deutsch- und englischsprachige Online-Tutorial unterstützt die Entwicklung und Förderung von Informationskompetenz als entscheidende Schlüsselqualifikation für Forschung und Weiterbildung. Ziel ist das Übermitteln komplexer Lösungsstrategien für eine sinnvolle Informationsrecherche bezogen auf unterschiedlichste Aufgabenbereiche. Neben effizienten Recherche- und Navigationsstrategien regt DISCUS die Kreativität an, den eigenen Informationsprozess bewusst und bedarfsgerecht zu gestalten. DISCUS vermittelt neben den Grundlagen zum Aufbau von Recherchestrategien auf spielerische und explorative Weise den Umgang mit Suchdatenbanken und verschiedensten Informationsquellen. Hierzu bietet es ein hoch interaktives Angebot an Aufgaben und Recherche-Simulationen sowie die Einbindung realer Datenbanken. Ein Survival Guide zum Umgang mit Datenbanken, die Wissensbasis 'DISCUS kompakt' und ein Selbsttest entwickeln die Fähigkeiten zur Bearbeitung der Fallbeispiele. Diese vermitteln über praxisorientierte Aufgaben Kompetenzen in der Nutzung einschlägiger Informationsquellen wie Aufsatz-, Stoff- und Patent-Datenbanken. Die qualitativ hochwertige visuelle Gestaltung der Benutzeroberfläche schafft eine angenehme Lernatmosphäre und unterstützt damit Wahrnehmung und Orientierung, erzeugt positive Emotionen und erhöht die Lernaktivität. Didaktisch soll DISCUS den Inhalt vielfältig darstellen, Perspektivenwechsel anbieten, verschiedene Nutzertypen ansprechen und ganz einfach Spaß machen. Der Rote Faden, der sich buchstäblich durch den gesamten Auftritt zieht, ist unter http://discus.tu-harburg.de aufzunehmen.
Microscopic Mechanism of Specific Peptide Adhesion to Semiconductor Substrates
Creators: name: Bachmann, Michael
name: Goede, Karsten
name: Beck-Sickinger, Annette G.
name: Grundmann, Marius
name: Irbäck, Anders
name: Janke, Wolfhard
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biomolecules (q-bio.BM)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The design of hybrid peptide-solid interfaces for nanotechnological applications such as biomolecular nanoarrays requires a deep understanding of the basic mechanisms of peptide binding and assembly at solid substrates. Here we show by means of experimental and computational analyses that the adsorption properties of mutated synthetic peptides at semiconductors exhibit a clear sequence-dependent adhesion specificity. Our simulations of a novel hybrid peptide-substrate model reveal the correspondence between proline mutation and binding affinity to a clean silicon substrate. After synthesizing theoretically suggested amino-acid sequences with different binding behavior, we confirm the relevance of the selective mutations upon adhesion in our subsequent atomic force microscopy experiments.
description: 14 pages, 4 figures
On Bogomolny equations in the Skyrme model
Creators: name: Stȩpień, Ł. T.
Publisher: name: arXiv
Year: 2018
Subjects: subject: General Physics (physics.gen-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: 35Q99

description: Using the concept of strong necessary conditions (CSNC), we derive a complete decomposition of the minimal Skyrme model into a sum of three coupled BPS submodels with the same topological bound. The bounds are saturated if corresponding Bogomolny equations, different for each submodel, are obeyed.
Detecting Baryon Acoustic Oscillations
Creators: name: Labatie, A.
name: Starck, J. -L.
name: Lachièze-Rey, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Baryon Acoustic Oscillations are a feature imprinted in the galaxy distribution by acoustic waves traveling in the plasma of the early universe. Their detection at the expected scale in large-scale structures strongly supports current cosmological models with a nearly linear evolution from redshift approximately 1000, and the existence of dark energy. Besides, BAOs provide a standard ruler for studying cosmic expansion. In this paper we focus on methods for BAO detection using the correlation function measurement. For each method, we want to understand the tested hypothesis (the hypothesis H0 to be rejected) and the underlying assumptions. We first present wavelet methods which are mildly model-dependent and mostly sensitive to the BAO feature. Then we turn to fully model-dependent methods. We present the most often used method based on the chi^2 statistic, but we find it has limitations. In general the assumptions of the chi^2 method are not verified, and it only gives a rough estimate of the significance. The estimate can become very wrong when considering more realistic hypotheses, where the covariance matrix of the measurement depends on cosmological parameters. Instead we propose to use a new method based on two modifications: we modify the procedure for computing the significance and make it rigorous, and we modify the statistic to obtain better results in the case of varying covariance matrix. We verify with simulations that correct significances are different from the ones obtained using the classical chi^2 procedure. We also test a simple example of varying covariance matrix. In this case we find that our modified statistic outperforms the classical chi^2 statistic when both significances are correctly computed. Finally we find that taking into account variations of the covariance matrix can change both BAO detection levels and cosmological parameter constraints.
Is it possible to measure new general relativistic third-body effects on the orbit of Mercury with BepiColombo?
Creators: name: Iorio, Lorenzo
Publisher: name: arXiv
Year: 2018
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Recently, Will calculated an additional contribution to the Mercury's precession of the longitude of perihelion $\varpi$ of the order of $\dot\varpi_\textrm{W}\simeq 0.22$ $\textrm{milliarcseconds per century}$ ($\textrm{mas cty}^{-1}$). It is partly a direct consequence of certain 1pN third-body accelerations entering the planetary equations of motion, and partly an indirect, mixed effect due to the simultaneous interplay of the standard 1pN pointlike acceleration of the primary with the Newtonian $N$-body acceleration, to the quadrupole order, in the analytical calculation of the secular perihelion precession with the Gauss equations. We critically discuss the actual measurability of the mixed effects with respect to direct ones. The current uncertainties in either the magnitude of the Sun's angular momentum $S_\odot$ and the orientation of its spin axis ${\boldsymbol{\hat{S}}}_\odot$ impact the precessions $\dot\varpi_{J_2^\odot},~\dot\varpi_\textrm{LT}$ induced by the Sun's quadrupole mass moment and angular momentum via the Lense-Thirring effect to a level which makes almost impossible to measure $\dot\varpi_\textrm{W}$ even in the hypothesis that it comes entirely from the aforementioned 1pN third-body accelerations. On the other hand, from the point of view of the Lense-Thirring effect itself, the mismodeled quadrupolar precession $δ\dot\varpi_{J_2^\odot}$ due to the uncertainties in ${\boldsymbol{\hat{S}}}_\odot$ corresponds to a bias of $\simeq 9\%$ of the relativistic one. The resulting simulated mismodeled range and range-rate times series of BepiColombo are at about the per cent level of the nominal gravitomagnetic ones.
description: LaTex2e, 15 pages, 2 tables, 3 figures. Equation (5) for the PPN combination of the parameters beta and gamma in front of the 1PN perihelion precession corrected
Density and Distribution Evaluation for Convolution of Independent Gamma Variables
Creators: name: Hu, Chaoran
name: Pozdnyakov, Vladimir
name: Yan, Jun
Publisher: name: arXiv
Year: 2018
Subjects: subject: Computation (stat.CO)
subject: Statistics Theory (math.ST)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Several numerical evaluations of the density and distribution of convolution of independent gamma variables are compared in their accuracy and speed. In application to renewal processes, an efficient formula is derived for the probability mass function of the event count.
Molecular modeling of solute partitioning in micellar systems
Creators: name: Yordanova, Denitsa
Publisher: name: TUHH Universitätsbibliothek
Year: 2020
Subjects: classificationCode: 540
subject: Chemie
classificationCode: 620
subject: Ingenieurwissenschaften

description: Das Verteilungsverhalten von gelösten Stoffen in mizellaren Systemen wird mit der Kombination zwischen Molekulardynamik (MD) Simulationen und COSMOmic auf atomarer Ebene untersucht. Dabei werden vorhergesagte Verteilungskoeffizienten durch Vergleich mit experimentellen Werten validiert. Freie Enegieprofile, welche experimentell nicht zugänglich sind, liefern Information über das Verteilungsverhalten abhängig von der Position des Moleküls in der Mizelle. Weiterhin wird ein Ansatz zur Verbesserung der Vorhersagequalität von COSMOmic für ionisierbare Moleküle in gemischten Mizellen vorgeschlagen.
description: Molecular dynamics (MD) simulations and the COSMOmic model are combined to investigate the solute partitioning in various micellar systems at an atomistic level. Thereby predicted partition coefficients are validated based on comparison with experimental data. Insights on the position dependent solute partitioning are provided from free energy profiles, which cannot be obtained experimentally. Furthermore, an approach to improve the prediction quality of COSMOmic for ionizable molecules in mixed micelles is proposed.
Equivariant K-theory and Resolution I: Abelian actions
Creators: name: Dimakis, Panagiotis
name: Melrose, Richard
Publisher: name: arXiv
Year: 2018
Subjects: subject: Algebraic Topology (math.AT)
subject: Differential Geometry (math.DG)
subject: Group Theory (math.GR)
subject: K-Theory and Homology (math.KT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: The smooth action of a compact Lie group on a compact manifold can be resolved to an iterated space, as made explicit by Pierre Albin and the second author. On the resolution the lifted action has fixed isotropy type, in an iterated sense, with connecting fibrations and this structure descends to a resolution of the quotient. For an abelian group action the equivariant K-theory can then be described in terms of bundles over the base with morphisms covering the connecting maps. A similar model is given, in terms of appropriately twisted deRham forms over the base as an iterated space, for delocalized equivariant cohomology in the sense of Baum, Brylinski and MacPherson. This approach allows a direct proof of their equivariant version of the Atiyah-Hirzebruch isomorphism.
Dance Teaching by a Robot: Combining Cognitive and Physical Human-Robot Interaction for Supporting the Skill Learning Process
Creators: name: Granados, Diego Felipe Paez
name: Yamamoto, Breno A.
name: Kamide, Hiroko
name: Kinugawa, Jun
name: Kosuge, Kazuhiro
Publisher: name: arXiv
Year: 2018
Subjects: subject: Robotics (cs.RO)
subject: Optimization and Control (math.OC)
subject: Applied Physics (physics.app-ph)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: This letter presents a physical human-robot interaction scenario in which a robot guides and performs the role of a teacher within a defined dance training framework. A combined cognitive and physical feedback of performance is proposed for assisting the skill learning process. Direct contact cooperation has been designed through an adaptive impedance-based controller that adjusts according to the partner's performance in the task. In measuring performance, a scoring system has been designed using the concept of progressive teaching (PT). The system adjusts the difficulty based on the user's number of practices and performance history. Using the proposed method and a baseline constant controller, comparative experiments have shown that the PT presents better performance in the initial stage of skill learning. An analysis of the subjects' perception of comfort, peace of mind, and robot performance have shown a significant difference at the p < .01 level, favoring the PT algorithm.
description: Presented at IEEE International Conference on Robotics and Automation ICRA-2017
Infrared studies of the Be star X Per
Creators: name: Mathew, Blesson
name: Banerjee, D. P. K.
name: Naik, Sachindra
name: Ashok, N. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Photometric and spectroscopic results are presented for the Be star X Per/HD 24534 from near-infrared monitoring in 2010-2011. The star is one of a sample of selected Be/X-ray binaries being monitored by us in the near-IR to study correlations between their X ray and near-IR behaviour. Comparison of the star's present near-IR magnitudes with earlier records shows the star to be currently in a prominently bright state with mean J, H, K magnitudes of 5.49, 5.33 and 5.06 respectively. The JHK spectra are dominated by emission lines of HeI and Paschen and Brackett lines of HI. Lines of OI 1.1287 and 1.3165 micron are also present and their relative strength indicates, since OI 1.1287 is stronger among the two lines, that Lyman beta fluorescence plays an important role in their excitation. Recombination analysis of the HI lines is done which shows that the Paschen and Brackett line strengths deviate considerably from case B predictions. These deviations are attributed to the lines being optically thick and this supposition is verified by calculating the line center optical depths predicted by recombination theory. Similar calculations indicate that the Pfund and Humphrey series lines should also be expected to be optically thick which is found to be consistent with observations reported in other studies. The spectral energy distribution of the star is constructed and shown to have an infrared excess. Based on the magnitude of the IR excess, which is modeled using a free-free contribution from the disc, the electron density in the disc is estimated and shown to be within the range of values expected in Be star discs.
description: Accepted for publication in MNRAS, 7 pages, 6 figures
Dual weighted residual based error control for nonstationary convection-dominated equations: potential or ballast?
Creators: name: Bruchhäuser, Marius Paul
name: Schwegler, Kristina
name: Bause, Markus
Publisher: name: arXiv
Year: 2018
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Even though substantial progress has been made in the numerical approximation of convection-dominated problems, its major challenges remain in the scope of current research. In particular, parameter robust a posteriori error estimates for quantities of physical interest and adaptive mesh refinement strategies with proved convergence are still missing. Here, we study numerically the potential of the Dual Weighted Residual (DWR) approach applied to stabilized finite element methods to further enhance the quality of approximations. The impact of a strict application of the DWR methodology is particularly focused rather than the reduction of computational costs for solving the dual problem by interpolation or localization.
description: arXiv admin note: text overlap with arXiv:1803.10643
Dynamics of interacting qubits coupled to a common bath: Non-Markovian quantum state diffusion approach
Creators: name: Zhao, Xinyu
name: Jing, Jun
name: Corn, Brittany
name: Yu, Ting
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-Markovian dynamics is studied for two interacting quibts strongly coupled to a dissipative bosonic environment. For the first time, we have derived the non-Markovian quantum state diffusion (QSD) equation for the coupled two-qubit system without any approximations, and in particular, without the Markov approximation. As an application and illustration of our derived time-local QSD equation, we investigate the temporal behavior of quantum coherence dynamics. In particular, we find a strongly non-Markovian regime where entanglement generation is significantly modulated by the environmental memory. Additionally, we studied the residual entanglement in the steady state by analyzing the steady state solution of the QSD equation. Finally, we have discussed an approximate QSD equation.
Kinematik der Begegnung von Schiffen und Kollisionsverhütung mit einer Betrachtung der Fahrregeln
Creators: name: Kwik, Kîng H.
Publisher: name: TUHH Universitätsbibliothek
Year: 1973
Subjects: classificationCode: 620
subject: Ingenieurwissenschaften
classificationCode: 620
subject: Engineering and allied operations
classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Kinematik der Begegnung von Schiffen und Kollisionsverhütung mit einer Betrachtung der Fahrregeln