cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Accurate and rapid gravitational waveform models for binary black hole coalescences
Creators: name: Setyawati, Yoshinta Eka
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2021
Subjects: subject: Gravitational wave
subject: Waveform modeling
subject: Machine learning
subject: Binary black-hole
subject: Gravitationswelle
subject: Wellenformmodellierung
subject: maschinelles Lernen
subject: binäres schwarzes Loch
subject: Dewey Decimal Classification::500 | Naturwissenschaften

description: The first direct gravitational wave detection by LIGO and Virgo in 2015 marked the beginning of the gravitational wave astronomy era. Gravitational waves are an excellent tool to prove general relativity and unveil compact objects' dynamics in the universe. Over the years, we observe more signals from coalescing black hole binaries. Signals from the detectors are filtered through numerous waveform templates coming from theoretical predictions. Some models are more accurate but slow, and the others are less accurate but fast. We face ever-increasing demands for accuracy, speed, and parameter coverage of waveform models with more detections. Thus, we investigate strategies to speed up waveform generation without losing much accuracy for future signal analysis. In this dissertation, we present our approach as follows: 1. developing a method to dynamically tune less accurate (but fast) models with a more accurate (but slow) models through an iterative dimensionality reduction technique, 2. investigating the performance of regression methods, including machine learning for higher dimensions, 3. adding eccentricity to quasicircular analytical models through fitting technique. We analyze our results' faithfulness and prospects to speed up waveform generation. Our methods can readily be applied to reduce the complexity and time of building a new waveform model. Additionally, we build a python package pyrex to carry out the quasicircular turned eccentric computation. This study is crucial for the development of models which include more parameters.
The group structure for jet bundles over Lie groups
Creators: name: Vizman, Cornelia
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 58A20

description: The jet bundle $J^kG$ of $k$-jets of curves in a Lie group $G$ has a natural Lie group structure. We present an explicit formula for the group multiplication in the right trivialization and for the group 2-cocycle describing the abelian Lie group extension $\mathfrak{g}\to J^{k}G\to J^{k-1}G$.
description: 12 pages
Gentiana brachyphylla Vill.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: G.brachyphylla Vill. Cat. 258 und 429. Obere Höhengrenze:die Angabe vom Matterhorn, 4200 m, ist zu bestätigen. Sichere hohe Fundstellen aus neuerer Zeit: Oberrothorn ob Zermatt, 3310m (Braun-Blanquet1919); bei der Hörnlihütte ob Zermatt, 3260 m (Thellung 1922); Gornergrat ob Zermatt, 3130 m (Braun-Blanquet 1919); Unterrothorn ob Zermatt, 3103 m (idem 1919); Kleines Allalinhorn (Saas), Südhang, bei der Britanniahütte, 3030bis 3050m (D. Dutoit 1937).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Nonlinear quantum piston for the controlled generation of vortex rings and soliton trains
Creators: name: Pinsker, Florian
name: Berloff, Natalia G.
name: Pérez-García, Víctor M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We propose a simple way to generate nonlinear excitations in a controllable way by managing interactions in Bose-Einstein condensates. Under the action of a quantum analogue of a classical piston the condensed atoms are pushed through the trap generating vortex rings in a fully three- dimensional condensates or soliton trains in quasi-one dimensional scenarios. The vortex rings form due to transverse instability of the shock wave train enhanced and supported by the energy transfer between waves. We elucidate in which sense the self-interactions within the atom cloud define the properties of generated vortex rings and soliton trains. Based on the quantum piston scheme we study the behavior of two component Bose-Einstein condensates and analyze how the presence of an additional superfluid influences the generation of vortex rings or solitons in the other component and vice versa. Finally, we show the dynamical emergence of skyrmions within two component systems in the immiscible regime.
Around the A.D. Alexandrov's theorem on a characterization of a sphere
Creators: name: Alexandrov, Victor
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 52C25, 52B70, 52C22, 51M20, 51K05

description: This is a survey paper on various results relates to the following theorem first proved by A.D. Alexandrov: \textit{Let $S$ be an analytic convex sphere-homeomorphic surface in $\mathbb R^3$ and let $k_1(\boldsymbol{x})\leqslant k_2(\boldsymbol{x})$ be its principal curvatures at the point $\boldsymbol{x}$. If the inequalities $k_1(\boldsymbol{x})\leqslant k\leqslant k_2(\boldsymbol{x})$ hold true with some constant $k$ for all $\boldsymbol{x}\in S$ then $S$ is a sphere.} The imphases is on a result of Y. Martinez-Maure who first proved that the above statement is not valid for convex $C^2$-surfaces. For convenience of the reader, in addendum we give a Russian translation of that paper by Y. Martinez-Maure originally published in French in \textit{C. R. Acad. Sci., Paris, Sér. I, Math.} {\bf 332} (2001), 41--44.
description: In Russian. 12 pages, 2 figures
Theoretical Investigation on Injection Locking of the EU 170 GHz 2 MW TE34,19-Mode Coaxial-Cavity Gyrotron
Creators: name: Brücker, Philipp T.
name: Avramidis, Konstantinos A.
name: Marek, Alexander
name: Thumm, Manfred
name: Jelonnek, John
Publisher: name: Institute of Electrical and Electronics Engineers (IEEE)
Year: 2021

description: Injection locking of gyrotron oscillators offers an improved mode stability and the precise phase and frequency control of the generated millimeter-wave signal. It might offer completely new possibilities for applications related to nuclear fusion plasma, spectroscopy, and radar. In this presentation it is shown that the theory of Kurokawa can be applied to understand the injection locking of gyrotrons and that it provides accurate prediction of the locking behavior. Based on that, the investigation on injection locking of the EU 170 GHz 2 MW TE 34,19 -mode coaxial-cavity gyrotron using self-consistent single and multimode simulations is presented. Detailed studies on injection signals containing competing modes to account either for signal impurities or for deliberate injection of competing modes are presented.
Active Learning of Inverse Models with Intrinsically Motivated Goal Exploration in Robots
Creators: name: Baranes, Adrien
name: Oudeyer, Pierre-Yves
Publisher: name: arXiv
Year: 2013
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Neural and Evolutionary Computing (cs.NE)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: We introduce the Self-Adaptive Goal Generation - Robust Intelligent Adaptive Curiosity (SAGG-RIAC) architecture as an intrinsi- cally motivated goal exploration mechanism which allows active learning of inverse models in high-dimensional redundant robots. This allows a robot to efficiently and actively learn distributions of parameterized motor skills/policies that solve a corresponding distribution of parameterized tasks/goals. The architecture makes the robot sample actively novel parameterized tasks in the task space, based on a measure of competence progress, each of which triggers low-level goal-directed learning of the motor policy pa- rameters that allow to solve it. For both learning and generalization, the system leverages regression techniques which allow to infer the motor policy parameters corresponding to a given novel parameterized task, and based on the previously learnt correspondences between policy and task parameters. We present experiments with high-dimensional continuous sensorimotor spaces in three different robotic setups: 1) learning the inverse kinematics in a highly-redundant robotic arm, 2) learning omnidirectional locomotion with motor primitives in a quadruped robot, 3) an arm learning to control a fishing rod with a flexible wire. We show that 1) exploration in the task space can be a lot faster than exploration in the actuator space for learning inverse models in redundant robots; 2) selecting goals maximizing competence progress creates developmental trajectories driving the robot to progressively focus on tasks of increasing complexity and is statistically significantly more efficient than selecting tasks randomly, as well as more efficient than different standard active motor babbling methods; 3) this architecture allows the robot to actively discover which parts of its task space it can learn to reach and which part it cannot.
Challenging the Standard Model by high precision comparisons of the fundamental properties of antiprotons and protons
Creators: name: Borchert, Matthias Joachim
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2021
Subjects: subject: Penning trap
subject: Antiproton
subject: Charge-to-mass ratio
subject: Penningfalle
subject: Masse-zu-Ladung-Verhältnis
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: This thesis describes high precision measurements on the fundamental properties of the antiproton, namely the charge-to-mass ratio and the magnetic moment. This work is embedded in the experimental work of the BASE collaboration (Baryon Antibaryon Symmetry Experiment). BASE operates a sophisticated cryogenic Multi-Penning trap system in the Antiproton Decelerator facility at CERN. One main result of this thesis are signiﬁcant technical improvements of the apparatus, which reduced the limitation of shot-to-shot cyclotron frequency scatter by a factor of more than ﬁve compared to earlier work. With this improved apparatus, a measurement campaign on the antiproton-to-proton charge-to-mass ratio with a statistical uncertainty of 20×10−12 and an overall uncertainty of about 35 × 10−12 was conducted. This campaign was part of a series of charge-to-mass ratio measurements on the antiproton with the overall goal to signiﬁcantly improve the previous best measurement conducted by BASE in 2014, which yielded a fractional uncertainty of 69×10−12. In this thesis, also the ﬁrst dedicated heating rate measurement in a cryogenic Penning trap experiment is described. Here, the lowest heating rates ever reported for an ion trap were observed. As part of this thesis, phase sensitive methods for measuring the cyclotron frequency of a single trapped ion were implemented in the BASE experiment. These methods allowed to measure the cyclotron frequency with a shot-to-shot scatter improved by a factor of ﬁve compared to methods used in previous experiments. The signiﬁcant improvements in cyclotron frequency scatter open up the possibility to measure the antiproton magnetic moment and the antiproton charge-to-mass ratio with much increased precision, and thereby enable more stringent tests of the fundamental CPT symmetry by direct comparisons of matter/antimatter conjugates.
Color transparency in the reaction nuclear rho production by virtual photons
Creators: name: Howell, Gary T.
name: Miller, Gerald A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We study the nuclear transparency $T$ for the exclusive reaction $γ^*+A\toρ+p+(A-1)^*$ at incident virtual photon energies $ν\ge$ 10 GeV %where the final state of the $A-1$-nucleon system is a one-hole state of the initial nucleus, to investigate the separate dependence on the photon virtuality, $Q^2$ and the 4-momentum-transfer-squared to the knocked-out proton, $t$. If the effects of color transparency are included, $T$ shows significant variation with $t$ even for small values of $Q^2$ for fixed values of the coherence length $l_c$, and also shows significant increase as $Q^2$ is increased at fixed $l_c$ and $t$. The value of $T$ is found to depend strongly on the phase space over which it is measured.
description: 22 pages, 10 figures
1-D Schrödinger operators with local point interactions: a review
Creators: name: Kostenko, Aleksey
name: Malamud, Mark
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We review recent developments in the theory of 1-D Schrödinger operators with local point interactions on a discrete set. The progress in this area was stimulated by recent advances in the extension theory of symmetric operators and in the theory of ordinary differential operators with distributional coefficients.
description: 27 pp
Doing design – (re)doing difference? Perspektiven von Gender und Diversity in der Designlehre
Creators: name: Krämer, Katharina
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2021
Subjects: subject: gender
subject: design teaching
subject: teaching-learning design
subject: Gender
subject: Designlehre
subject: Lehr-Lerngestaltung
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie
subject: Dewey Decimal Classification::700 | Künste, Bildende Kunst allgemein

description: Die Forschungsarbeit beleuchtet, wie Gender im und durch Design wirksam wird und somit zum ›Doing Gender im Design‹ wird. Sie untersucht, wie sich diese Zusammenhänge in der Designlehre vermitteln lassen, inwieweit hochschuldidaktische Anforderungen an eine gender- und diversitätsge-rechte Designlehre umgesetzt werden, und an welchen Stellen es Potenziale zur weiterführenden Ein-bindung von Gender und Diversity gibt. Anhand einer Case Study der eigenen Lehr- und Arbeitspraxis werden Möglichkeiten auf struktureller, inhaltlicher und didaktischer Ebene untersucht, inhaltliche und didaktische Anknüpfungspunkte für eine Einbindung von Gender und Diversity in die Designleh-re aufgezeigt und verdeutlicht, welche individuellen, institutionellen und strukturellen Voraussetzun-gen und Verhältnisse sich förderlich und hemmend zeigen.
A nonlinear least squares method for the inverse droplet coagulation problem
Creators: name: Jones, Peter P.
name: Ball, Robin C.
name: Connaughton, Colm
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: If the rates, $K(x,y)$, at which particles of size $x$ coalesce with particles of size $y$ is known, then the mean-field evolution of the particle-size distribution of an ensemble of irreversibly coalescing particles is described by the Smoluchowski equation. We study the corresponding inverse problem which aims to determine the coalescence rates, $K(x,y)$ from measurements of the particle size distribution. We assume that $K(x,y)$ is a homogeneous function of its arguments, a case which occurs commonly in practice. The problem of determining, $K(x,y)$, a function to two variables, then reduces to a simpler problem of determining a function of a single variable plus two exponents, $μ$ and $ν$, which characterise the scaling properties of $K(x,y)$. The price of this simplification is that the resulting least squares problem is nonlinear in the exponents $μ$ and $ν$. We demonstrate the effectiveness of the method on a selection of coalescence problems arising in polymer physics, cloud science and astrophysics. The applications include examples in which the particle size distribution is stationary owing to the presence of sources and sinks of particles and examples in which the particle size distribution is undergoing self-similar relaxation in time.
description: 10 pages, 7 figures
Remarks on free mutual information and orbital free entropy
Creators: name: Izumi, Masaki
name: Ueda, Yoshimichi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Operator Algebras (math.OA)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: The present notes provide a proof of $i^*(\mathbb{C}P+\mathbb{C}(I-P)\,;\mathbb{C}Q+\mathbb{C}(I-Q)) = -χ_\mathrm{orb}(P,Q)$ for any pair of projections $P,Q$ with $τ(P)=τ(Q)=1/2$. The proof includes new extra observations, such as a subordination result in terms of Loewner equations. A study of the general case is also given.
description: 13 pages
Principles and practices of the process-conference approach to writing
Creators: name: Emilia, Emi
Publisher: name: Deakin University
Year: 1996

description: This study involved four teachers: two from grade 1, one from grade 3/4, and one from grade 5/6. Three teachers were from the same primary school, while one was from another school where the process-conference approach was utilized. Data were collected through interviews and participant observation, and analyzed by the researcher. A triangulation process was employed to compare and contrast the data from various collection techniques, enhancing validity through confirmation of interpretations with the teachers. 

The findings revealed strong beliefs and understandings among the teachers regarding the process-conference approach, with their principles of teaching writing aligning with the suggestions from advocates of the approach. Moreover, the teachers' stated principles were reflected in their classroom practices. Of the criticisms examined, only one was deemed justified by all teachers: that “the free choice of topics creates gender-stereotypical writings.” Other criticisms were not considered valid and were not observed in practice. 

The research results were encouraging for the researcher, who aims to implement the approach in Indonesia. The process-conference approach is valuable for Indonesian schools, aiding children in their learning success. By emphasizing authorship alongside writing mechanics, the approach fosters children's development as both scribes and authors. Writing across various genres allows children to meet personal needs (e.g., personal recounts) and social needs (e.g., letters, reports, essays, instructions). Enhanced confidence and competence in writing diverse genres can empower students, facilitating access to higher education and enriching their daily lives.
Numerical study of the overlap Lee-Yang singularities in the three-dimensional Edwards-Anderson model
Creators: name: Baños, R. A.
name: Gil-Narvion, J. M.
name: Monforte-Garcia, J.
name: Ruiz-Lorenzo, J. J.
name: Yllanes, D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We have characterized numerically, using the Janus computer, the Lee-Yang complex singularities related to the overlap in the 3D Ising spin glass with binary couplings in a wide range of temperatures (both in the critical and in the spin-glass phase). Studying the behavior of the zeros at the critical point, we have obtained an accurate measurement of the anomalous dimension in very good agreement with the values quoted in the literature. In addition, by studying the density of the zeros we have been able to characterize the phase transition and to investigate the Edwards-Anderson order parameter in the spin-glass phase, finding agreement with the values obtained using more conventional techniques.
description: 20 pages, 11 figures. Some typos corrected and references added
title: Residual gravity anomalies of the Taupō Volcanic Zone and adjacent region
Creators: name: Stagpoole, Vaughan M
name: Miller, Craig A
name: Brakenrig, Thomas
name: Macdonald, Nick
name: Caratori Tontini, Fabio
Publisher: name: GNS Science
Year: 2019

description: The 2019 map of residual gravity anomalies of the Taupō Volcanic Zone and adjacent region is an update of the map of Stagpoole and Bibby (1999). An additional 1795 observations have been used in the 2019 compilation, bringing the total to 9189. All data used for the map have been uniformly processed and anomalies calculated using high resolution digital terrain models. The regional gravity field, used to separate the residual gravity anomalies from Bouguer anomalies, is from Stagpoole and Nicol (2008). GMT software was used for gridding the data and a 1:250,000 map was produced with the QGIS geographic information system. The 2019 map shows features in more detail than the 1999 map. Both the Taupō Volcanic Zone and the wider Central Volcanic Region are within a negative residual gravity anomaly. The whole eastern margin of the Taupō Volcanic Zone and western margin from Ruapehu to Tokoroa coincide with steep gravity gradients. North of Tokoroa, the margin of the Taupō Volcanic Zone defined from volcanism is not associated with a clearly observable gravity gradient. The negative residual gravity anomaly defining the area referred to as the Central Volcanic Region widens towards the Bay of Plenty coast in a series of steps, possibly related to older northeast-trending faults. Volcanic calderas in the Taupō Volcanic Zone identified from geological mapping correspond with prominent low-gravity features. There is also a gravity low at Mihi that is not presently defined as a caldera but may be related to caldera collapse. Low-gravity features north and northwest of Rotorua have unknown origins, although they may be partly related to thick, elevated, low-density volcanic material. Offshore, in the Bay of Plenty, a low-gravity feature corresponds with a caldera inferred from interpretation of seismic reflection data. Sedimentary basins outside the Taupō Volcanic Zone also have low residual gravity. Within the Taupō Volcanic Zone, a relative gravity high coincides with greywacke basement outcrops east of Paengaroa. Other high-gravity features may be related to near-surface greywacke basement or old andesitic volcanic centres buried beneath younger and less dense volcanic material. (auth)
Global structure of the pulsar force-free magnetosphere revisited
Creators: name: Petrova, S. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: A new model of the pulsar force-free magnetosphere is suggested, which includes the presence of the polar, outer and slot gaps. It is based on a new exact solution of the pulsar equation in the form of an offset monopole and the resultant split-offset monopole scheme.
description: 3 pages, 2 figures; to appear in Proceedings of IAUS 291 "Neutron Stars and Pulsars: Challenges and Opportunities after 80 years", J. van Leeuwen (ed.)
Gentiana terglouensis Hacquet
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: G. terglouensis Hacquet (G. tergloviensis auct., G. triglaviensis Paulin, G. imbricata Froelich non Schleicher) Für das Wallis zu streichen (vgl. die folgende Art).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
title: Endoscopes : de la désinfection à la stérilisation et l’usage unique ?
Creators: name: Hajjar, Joseph
Publisher: name: Health & Co
Year: 2018

description: Le risque infectieux en endoscopie (endoscopes souples thermosensibles), décrit depuis les années 1990, est évalué entre 1 et 3 cas par million d’actes endoscopiques. Il est probablement sous-estimé en raison du délai entre la réalisation du geste et la détection de l’infection. La gestion de ce risque fait partie des priorités de l’axe 3 du programme national d’actions de prévention des infections associées aux soins (Propias). Suivant l’avis du Haut Conseil de la santé publique (HCSP) du 26 juin 2013, les nombreuses recommandations de bonnes pratiques pour le traitement des endoscopes ont fait l’objet, en 2016, d’un document unique par voie d’instruction. Parmi les dix-huit fiches qui le composent, deux sont consacrées aux possibilités de disposer d’endoscopes stérilisables ou à usage unique. L’objectif de cet article est de faire un point synthétique sur ces alternatives à la désinfection.
A weaving process to define requirements for Cooperative Information System
Creators: name: Amroune, Mohamed
name: Inglebert, Jean Michel
name: Zarour, Nacereddine
name: Charrel, Pierre Jean
Publisher: name: arXiv
Year: 2013
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: The development of a Cooperative Information System (CIS) becomes more and more complex, new challenges arise for managing this complexity. So, the aspect paradigm is regarded as a promising software development technique which can reduce the complexity and cost of developing large software systems. This opportunity can be used to develop a CIS able to support the interconnection of organizations information systems in order to ensure a common global service and to support the tempo of change in the business world that is increasing at an exponential level. We previously proposed an approach named AspeCiS (An Aspect-oriented Approach to Develop a Cooperative Information System) to develop a Cooperative Information System from existing Information Systems by using their artifacts such as existing requirements, and design. In this approach we have studied how to elicit CIS Requirements called Cooperative Requirements in AspeCiS. In this paper we propose a weaving process to define these requirements by reusing existing requirements and new aspectual requirements that we define to modify these requirements in order to be reused.
Low-Rank Separated Representation Surrogates of High-Dimensional Stochastic Functions: Application in Bayesian Inference
Creators: name: Validi, AbdoulAhad
Publisher: name: arXiv
Year: 2013
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Mathematical Physics (math-ph)
subject: Applications (stat.AP)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: This study introduces a non-intrusive approach in the context of low-rank separated representation to construct a surrogate of high-dimensional stochastic functions, e.g., PDEs/ODEs, in order to decrease the computational cost of Markov Chain Monte Carlo simulations in Bayesian inference. The surrogate model is constructed via a regularized alternative least-square regression with Tikhonov regularization using a roughening matrix computing the gradient of the solution, in conjunction with a perturbation-based error indicator to detect optimal model complexities. The model approximates a vector of a continuous solution at discrete values of a physical variable. The required number of random realizations to achieve a successful approximation linearly depends on the function dimensionality. The computational cost of the model construction is quadratic in the number of random inputs, which potentially tackles the curse of dimensionality in high-dimensional stochastic functions. Furthermore, this vector valued separated representation-based model, in comparison to the available scalar-valued case, leads to a significant reduction in the cost of approximation by an order of magnitude equal to the vector size. The performance of the method is studied through its application to three numerical examples including a 41-dimensional elliptic PDE and a 21-dimensional cavity flow.
Spectral analysis of classes of subriemannian manifolds
Creators: name: Laaroussi, Abdellah
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2021
Subjects: subject: subriemannian geometry
subject: sublaplacian
subject: sub-elliptic heat kernel
subject: asymptotics
subject: subriemannsche Geometrie
subject: sub-Laplace Operator
subject: sub-elliptischer Wärmeleitungskern
subject: asymptotische Analysis
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: In this thesis we study classes of subriemannian manifolds and their sublaplacians. We determine the spectrum of the intrinsic sublaplacian on pseudo H-type nilmanifolds. Moreover, we construct an arbitrary number of isospectral but pairwise non-homeomorphic pseudo H-type nilmanifolds with respect to the sublaplacian. Furthermore, with the help of the representation theory of step $2$ nilpotent Lie groups, we show that the spectrum of the intrinsic sublaplacian on nilmanifolds whose covering space is a step $2$ Carnot group can be completely expressed in terms of the underlying metric Lie algebra data. In the case of H-type nilmanifolds whose covering space has odd dimensional center, we prove a Poisson summation formula that relates the spectrum of the intrinsic sublaplacian to the lengths of closed subriemannian geodesics. Based on the nilpotent approximation of subriemannian manifolds, we compare two subriemannian structures of step $2$ and rank $4$ on the Euclidean sphere $\mathbb{S}^7$ with regards to various geometric and analytical properties. We show that both subriemannian structures are neither locally isometric nor isospectral with respect to the subaplacian. Finally, we study the heat kernel associated to the intrinsic sublaplacian on a quaternionic contact manifold considered as a subriemannian manifold. More precisely, we explicitly compute the first two coefficients appearing in the small time asymptotic expansion of the heat kernel on the diagonal. We show that the second coefficient coincides with the quaternionic contact scalar curvature up to a (universal) constant multiple.
title: Couverture vaccinale et impact des campagnes de sensibilisation à la vaccination antigrippale chez les professionnels de santé
Creators: name: Narbey, David
Publisher: name: Health & Co
Year: 2018

description: Objectif. Évaluer l’impact des campagnes de sensibilisation à la vaccination antigrippale sur la couverture vaccinale antigrippale (CV) des professionnels de santé dans les établissements de santé (ES) et médicosociaux (EMS) français sur deux années consécutives. Méthode. Étude par autoquestionnaire en ligne à destination des ES et des EMS. Tous les professionnels ont été inclus pour la mesure de la CV à T0 (2015-2016) et à T1 (2016-2017). Résultats. L’analyse a porté sur 274 établissements (46,7% d’ES et 53,3% d’EMS). De T0 à T1, il y a eu une augmentation significative de la CV antigrippale pour l’ensemble du personnel, passant de 15,6% à 17,4% (p<0,0001) ; les médecins avaient la CV antigrippale la plus élevée (35,5% et 34,8%), les infirmiers présentaient des taux moindres (16,3% et 17,7%) et les autres professionnels avaient des taux à 10,9% et 12,2%. Pour les deux années étudiées, ces taux étaient plus élevés dans les EMS. D’autre part, la CV antigrippale de l’ensemble du personnel était plus élevée si l’établissement avait réalisé une campagne de sensibilisation (T0 : 15,9% versus 14%, p<0,05 ; T1 : 17,7% versus 12,9%, p<0,05) ; la hausse était accrue en cas d’utilisation de la campagne de sensibilisation multimodale du centre de coordination de la lutte contre les infections nosocomiales (CClin) Sud-Est (T1 : 18% versus autre campagne 17,3%, p<0,05). Conclusion. Cette étude confirme l’impact positif d’une campagne de sensibilisation sur la CV antigrippale des professionnels de santé. Toutefois, ces augmentations restent modestes et sont fonction du type d’établissement (ES versus EMS) et de la catégorie professionnelle.
Late Spectral Evolution of the Ejecta and Reverse Shock in SN1987A
Creators: name: Fransson, Claes
name: Larsson, Josefin
name: Spyromilio, Jason
name: Chevalier, Roger
name: Groningsson, Per
name: Jerkstrand, Anders
name: Leibundgut, Bruno
name: McCray, Richard
name: Challis, Peter
name: Kirshner, Robert P.
name: Kjaer, Karina
name: Lundqvist, Peter
name: Sollerman, Jesper
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present observations with VLT and HST of the broad emission lines from the inner ejecta and reverse shock of SN 1987A from 1999 until 2012 (days 4381 -- 9100 after explosion). We detect broad lines from H-alpha, H-beta, Mg I], Na I, [O I], [Ca II] and a feature at 9220 A. We identify the latter line with Mg II 9218, 9244,most likely pumped by Ly-alpha fluorescence. H-alpha, and H-beta both have a centrally peaked component, extending to 4500 km/s and a very broad component extending to 11,000 km/s, while the other lines have only the central component. The low velocity component comes from unshocked ejecta, heated mainly by X-rays from the circumstellar ring collision, whereas the broad component comes from faster ejecta passing through the reverse shock. The reverse shock flux in H-alpha has increased by a factor of 4-6 from 2000 to 2007. After that there is a tendency of flattening of the light curve, similar to what may be seen in soft X-rays and in the optical lines from the shocked ring. The core component seen in H-alpha, [Ca II] and Mg II has experienced a similar increase, consistent with that found from HST photometry. The ring-like morphology of the ejecta is explained as a result of the X-ray illumination, depositing energy outside of the core of the ejecta. The energy deposition in the ejecta of the external X-rays illumination is calculated using explosion models for SN 1987A and we predict that the outer parts of the unshocked ejecta will continue to brighten because of this. We finally discuss evidence for dust in the ejecta from line asymmetries.
description: Submitted to ApJ. Comments welcome
title: Analyse d’une épidémie de grippe par la méthode Alarm dans un établissement d’hébergement pour personnes âgées dépendantes
Creators: name: Lieutard, Martine
Publisher: name: Health & Co
Year: 2018

description: Contexte et objectif. Dans un contexte d’épidémie de grippe communautaire à l’origine de cas groupés d’infections respiratoires aiguës (IRA) dans les établissements d’hébergement pour personnes âgées dépendantes (Ehpad) de son territoire, l’équipe mobile d’hygiène des Hospices civils de Lyon a réalisé, dans l’un d’entre eux, l’analyse systémique de cet épisode par la méthode Association of litigation and risk management (Alarm). L’objectif était d’identifier les facteurs ayant favorisé la transmission du virus et de proposer des actions d’amélioration. Méthode. Le déroulement des différentes étapes de la méthode Alarm a permis de mettre en évidence l’existence de causes racines, principalement organisationnelles. Résultats. Les résultats obtenus montrent une méconnaissance des protocoles de l’institution, et des taux de vaccination des résidents et des professionnels insuffisants. Les facteurs liés à l’organisation, au management et au contexte institutionnel font apparaître des problèmes d’approvisionnement en matériel, des défauts d’information ou de transmission, un retard de signalement, et un manque d’anticipation vis-à-vis du risque épidémique. Au terme de cette analyse, un plan d’actions avec un calendrier et des indicateurs de réalisation a été proposé à l’Ehpad. Conclusion. Cette analyse a permis de mettre en évidence des dysfonctionnements profonds, avec une bonne participation des professionnels. Elle confirme la nécessité de travailler sur le risque infectieux en Ehpad, en particulier sur le risque épidémique.
title: 'Play Up the Asianness': A history of East and Southeast Asian stereotypes in Western comedy and how contemporary ESEA stand-up comedians engage with them
Creators: name: Chirapiwat, Natcha
Publisher: name: University of Kent
Year: 2023

description: This thesis aims to analyse how East Asian stand-up comedians address their race to Western audiences, particularly focusing on the use and impact of stereotypes. The first half of the research (chapters 1 to 3) is dedicated to the history of East Asian stereotypes from 1848 (when large-scale immigration from East Asia to the West first occurred) to present day, creating a genealogy of them and the circumstances that led to them. Each chapter culminates in a case study of how contemporary comedy perpetuated and interacted with those stereotypes, and what this can reveal about perceptions of East Asian people at the time. The purpose of these chapters is to understand the implications of these stereotypes without validating or dismissing them. The second half of the research is split into three case studies: Margaret Cho, Ali Wong, and Phil Wang. These case studies were chosen as they are representative of a range of identities and shifts in popular culture, while also all directly addressing the impact of East Asian stereotypes on their work in varying ways. These case studies draw from performed material, interviews, and writing to provide an in-depth analysis of the ways in which East Asian stand-up comedians navigate and negotiate with public/audience perceptions of their character based on their ethnicity.
title: Comportement imprévisible des légionelles dans les réseaux d’eau chaude sanitaire hospitaliers : une seule analyse réglementaire annuelle est-elle informative ?
Creators: name: Licznar-Fajardo, Patricia
Publisher: name: Health & Co
Year: 2018

description: La légionellose est une infection respiratoire opportuniste grave, due à l’inhalation d’aérosols contaminés par Legionella pneumophila, dont le réservoir préférentiel est le réseau d’eau chaude sanitaire (ECS). Objectif. Afin de contrôler le risque d’exposition en établissement de santé, la réglementation impose la recherche et le dénombrement des légionelles une fois par an. Disposant de peu de données concernant la variabilité temporelle de la contamination d’un point d’eau ou d’un réseau, un point d’eau a été choisi pour un suivi hebdomadaire de la contamination et quatre bâtiments pavillonnaires ont été suivis régulièrement entre 2015 et 2018. Matériel et méthodes. La recherche et le dénombrement des légionelles ont été réalisés selon la norme française (NF) T90-431. Résultats. Le suivi hebdomadaire a montré de fortes variations temporelles non expliquées par les actions sur le réseau, et le suivi des contaminations à l’échelle d’un bâtiment a montré une contamination localisée et persistante malgré les traitements réalisés sur le réseau. Trois bâtiments de même configuration architecturale présentent des profils de contamination contrastés. La confrontation des données aux caractéristiques des réseaux d’ECS de chaque bâtiment n’est pas explicative. Conclusion. La surveillance lourde, mais limitée au dénombrement des légionelles, ne donne que peu d’éléments explicatifs permettant la prise en charge raisonnée des contaminations de l’ECS dans un hôpital. Des approches intégrées d’écologie microbienne sont certainement nécessaires.
Residual Stresses in Glasses
Creators: name: Ballauff, M.
name: Brader, J. M.
name: Egelhaaf, S. U.
name: Fuchs, M.
name: Horbach, J.
name: Koumakis, N.
name: Krüger, M.
name: Laurati, M.
name: Mutch, K. J.
name: Petekidis, G.
name: Siebenbürger, M.
name: Voigtmann, Th.
name: Zausch, J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The history dependence of the glasses formed from flow-melted steady states by a sudden cessation of the shear rate $\dotγ$ is studied in colloidal suspensions, by molecular dynamics simulations, and mode-coupling theory. In an ideal glass, stresses relax only partially, leaving behind a finite persistent residual stress. For intermediate times, relaxation curves scale as a function of $\dotγt$, even though no flow is present. The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The theory describes this history dependence of glasses sharing the same thermodynamic state variables, but differing static properties.
description: submitted to Physical Review
Efficient grid-based Bayesian estimation of nonlinear low-dimensional systems with sparse non-Gaussian PDFs
Creators: name: Bewley, T R
name: Sharma, A S
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: Bayesian estimation strategies represent the most fundamental formulation of the state estimation problem available, and apply readily to nonlinear systems with non-Gaussian uncertainties. The present paper introduces a novel method for implementing grid-based Bayesian estimation which largely sidesteps the severe computational expense that has prevented the widespread use of such methods. The method represents the evolution of the probability density function (PDF) in phase space, $p_{\x}(\x',t)$, discretized on a fixed Cartesian grid over {\it all} of phase space, and consists of two main steps: (i) Between measurement times, $p_{\x}(\x',t)$ is evolved via numerical discretization of the Kolmogorov forward equation, using a Godunov method with second-order corner transport upwind correction and a total variation diminishing flux limiter; (ii) at measurement times, $p_{\x}(\x',t)$ is updated via Bayes' theorem. Computational economy is achieved by exploiting the localised nature of $p_{\x}(\x',t)$. An ordered list of cells with non-negligible probability, as well as their immediate neighbours, is created and updated, and the PDF evolution is tracked {\it only} on these active cells. %The grid-based discretization of $p_{\x}(\x',t)$ in this approach avoids the requirement for resampling associated with particle-based representations of the PDF.
Ein hochmittelalterliches Gehöft aus der ersten Hälfte des 12. Jahrhunderts mit Buntmetallproduktion bei Neukirchen, Wartburgkreis/Thüringen
Creators: name: Spazier, Ines
name: Mecking, Oliver
Publisher: name: Mitteilungen der Deutschen Gesellschaft für Archäologie des Mittelalters und der Neuzeit
Year: 2016

description: [nicht vorhanden / not available]
description: Mitteilungen der Deutschen Gesellschaft für Archäologie des Mittelalters und der Neuzeit, Bd. 29 (2016): Mitteilungen der DGAMN: Ressourcen
Spatial dimensions of social unrest and armed violence
Creators: name: Wong, Melvin Heen Lung
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2021
Subjects: subject: Political economy
subject: social unrest
subject: economic development
subject: political violence
subject: ethnic inequality
subject: Politische Ökonomie
subject: Soziale Unruhen
subject: Ökonomische Entwicklung
subject: Politische Gewalt
subject: Ethnische Ungleichheit
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: Social unrest and armed violence rewind development achievements in the fight against poverty. This thesis examines various factors contributing to social unrest and armed violence in different parts of a country. A common method of this thesis is the empirical regression analysis of geo-spatial data to explain social unrest and armed violence. I find four results. First, social unrest occurs more likely in areas where droughts coincide with existing ethnic grievances. Second, to identify these grievances, we develop a novel spatial inequality measure between and within ethnic groups. Validation of the inequality measure against perceived differences in identity groups’ economic conditions shows that individuals feel ethnic grievances. Third, competition between armed groups causally increases the level of violence. Finally, there is no evidence that development aid increases civil wars, but Chinese aid seems to increase state repressions and a higher tolerance for autocratic rule. This thesis shows that spatial characteristics can help understand and explain social unrest and armed violence within countries.
On-demand semiconductor single-photon source with near-unity indistinguishability
Creators: name: He, Yu-Ming
name: He, Yu
name: Wei, Yu-Jia
name: Wu, Dian
name: Atatüre, Mete
name: Schneider, Christian
name: Höfling, Sven
name: Kamp, Martin
name: Lu, Chao-Yang
name: Pan, Jian-Wei
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Single photon sources based on semiconductor quantum dots offer distinct advantages for quantum information, including a scalable solid-state platform, ultrabrightness, and interconnectivity with matter qubits. A key prerequisite for their use in optical quantum computing and solid-state networks is a high level of efficiency and indistinguishability. Pulsed resonance fluorescence (RF) has been anticipated as the optimum condition for the deterministic generation of high-quality photons with vanishing effects of dephasing. Here, we generate pulsed RF single photons on demand from a single, microcavity-embedded quantum dot under s-shell excitation with 3-ps laser pulses. The pi-pulse excited RF photons have less than 0.3% background contributions and a vanishing two-photon emission probability. Non-postselective Hong-Ou-Mandel interference between two successively emitted photons is observed with a visibility of 0.97(2), comparable to trapped atoms and ions. Two single photons are further used to implement a high-fidelity quantum controlled-NOT gate.
description: 11 pages, 11 figures
Yangians and W-algebras
Creators: name: Briot, C.
name: Ragoucy, E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We present a connection between W-algebras and Yangians, in the case of gl(N) algebras, as well as for twisted Yangians and/or super-Yangians. This connection allows to construct an R-matrix for the W-algebras, and to classify their finite-dimensional irreducible representations. We illustrate it in the framework of nonlinear Schroedinger equation in 1+1 dimension.
description: 13 pages This note corresponds to a talk given by E. Ragoucy at NEEDS 2000 (Gokova, Turkey, July 2000) and at Group23 (XXIIIth ICGTMP, Dubna, Russia, August 2000)
On the use of fractional calculus for the probabilistic characterization of random variables
Creators: name: Cottone, Giulio
name: Di Paola, Mario
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistics Theory (math.ST)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In this paper, the classical problem of the probabilistic characterization of a random variable is re-examined. A random variable is usually described by the probability density function (PDF) or by its Fourier transform, namely the characteristic function (CF). The CF can be further expressed by a Taylor series involving the moments of the random variable. However, in some circumstances, the moments do not exist and the Taylor expansion of the CF is useless. This happens for example in the case of $α$--stable random variables. Here, the problem of representing the CF or the PDF of random variables (r.vs) is examined by introducing fractional calculus. Two very remarkable results are obtained. Firstly, it is shown that the fractional derivatives of the CF in zero coincide with fractional moments. This is true also in case of CF not derivable in zero (like the CF of $α$--stable r.vs). Moreover, it is shown that the CF may be represented by a generalized Taylor expansion involving fractional moments. The generalized Taylor series proposed is also able to represent the PDF in a perfect dual representation to that in terms of CF. The PDF representation in terms of fractional moments is especially accurate in the tails and this is very important in engineering problems, like estimating structural safety.