cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Compression-based investigation of the dynamical properties of cellular automata and other systems
Creators: name: Zenil, Hector
Publisher: name: arXiv
Year: 2009
Subjects: subject: Computational Complexity (cs.CC)
subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: E.4

description: A method for studying the qualitative dynamical properties of abstract computing machines based on the approximation of their program-size complexity using a general lossless compression algorithm is presented. It is shown that the compression-based approach classifies cellular automata (CA) into clusters according to their heuristic behavior, with these clusters showing a correspondence with Wolfram's main classes of CA behavior. A compression based method to estimate a characteristic exponent to detect phase transitions and measure the resiliency or sensitivity of a system to its initial conditions is also proposed. A conjecture regarding the capability of a system to reach computational universality related to the values of this phase transition coefficient is formulated. These ideas constitute a compression-based framework for investigating the dynamical properties of cellular automata and other systems.
description: 28 pages. This version includes the conjecture relating the transition coefficient to computational universality. Camera ready version
Fast domain wall motion in nanostripes with out-of-plane fields
Creators: name: Kunz, Andrew
name: Reiff, Sarah C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Controlling domain wall motion is important due to the impact on the viability of proposed nanowire devices. One hurdle is slow domain wall speed when driven by fields greater than the Walker field, due to nucleation of vortices in the wall. We present simulation results detailing the dynamics of these vortices; including the nucleation and subsequent fast ejection of the vortex core leading to fast domain wall speeds. The ejection is due to the reversal of the core moments by an out-of-plane field. The technique can be used to produce domain walls of known orientation independent of the initial state.
description: 12 pages (3 figures)
Global solution to the Cauchy problem on a universe fireworks model
Creators: name: Jiang, Zhenglu
name: Tian, Hongjiong
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 76P05, 35Q75

description: We prove existence and uniqueness of the global solution to the Cauchy problem on a universe fireworks model with finite total mass at the initial state when the ratio of the mass surviving the explosion, the probability of the explosion of fragments and the probability function of the velocity change of a surviving particle satisfy the corresponding physical conditions. Although the nonrelativistic Boltzmann-like equation modeling the universe fireworks is mathematically easy, this paper leads rather theoretically to an understanding of how to construct contractive mappings in a Banach space for the proof of the existence and uniqueness by means of methods taken from the famous work by DiPerna & Lions about the Boltzmann equation. We also show both the regularity and the time-asymptotic behavior of solution to the Cauchy problem.
title: On right-veering diffeomorphisms and binding sums
Creators: name: Orbegozo Rodriguez, Miguel
Publisher: name: University of Glasgow
Year: 2023

description: This thesis consists of two parts, more or less independent of each other but both devoted to the study of open book decompositions of 3-manifolds and their relationship to contact structures.

Right-veering diffeomorphisms are related to tightness of contact structures due to a result of Honda, Kazez, and Matić but it is in general difficult to determine whether a given diffeomorphism is right-veering. In the first part we prove that the right-veering property can be detected in a combinatorial way.

In the second part, we explore properties of an operation of contact manifolds (with a prescribed open book) called the binding sum. We show that even if the summands are Stein fillable the result of the sum need not be, and indeed can be overtwisted. We also provide an explicit computation of vanishing of the Heegaard Floer contact class for an infinite family of such sums where the summands are Stein fillable.
Alzheimer's Disease Diagnosis via Deep Factorization Machine Models
Creators: name: Ronge, Raphael
name: Nho, Kwangsik
name: Wachinger, Christian
name: Pölsterl, Sebastian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: The current state-of-the-art deep neural networks (DNNs) for Alzheimer's Disease diagnosis use different biomarker combinations to classify patients, but do not allow extracting knowledge about the interactions of biomarkers. However, to improve our understanding of the disease, it is paramount to extract such knowledge from the learned model. In this paper, we propose a Deep Factorization Machine model that combines the ability of DNNs to learn complex relationships and the ease of interpretability of a linear model. The proposed model has three parts: (i) an embedding layer to deal with sparse categorical data, (ii) a Factorization Machine to efficiently learn pairwise interactions, and (iii) a DNN to implicitly model higher order interactions. In our experiments on data from the Alzheimer's Disease Neuroimaging Initiative, we demonstrate that our proposed model classifies cognitive normal, mild cognitive impaired, and demented patients more accurately than competing models. In addition, we show that valuable knowledge about the interactions among biomarkers can be obtained.
description: Accepted at International Workshop on Machine Learning in Medical Imaging (MLMI) 2021
Correlation of health work in schools and survey of University Health service
Creators: name: Dyer, Aileen
Publisher: name: University of Oregon
Year: 1932
Subjects: Child
Schools
Public Health Nursing
Student Health Services
Health Education

description: As is set forth by the National Education Association Committee on the Reorganization of Secondary Schools, we find the first objective in education is health. Various meanings of the term health education have been presented but at this present time the trend is to think of health education as knowledge which will help the child to live a better life.
Multicomplexes and spectral sequences
Creators: name: Hurtubise, David E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Topology (math.AT)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 18G40, 55T99

description: In this note we present some algebraic examples of multicomplexes whose differentials differ from those in the spectral sequences associated to the multicomplexes. The motivation for constructing examples showing the algebraic distinction between a multicomplex and its associated spectral sequence comes from the author's work on Morse-Bott homology with A. Banyaga.
description: minor revisions
Optical anisotropies of asymmetric double GaAs (001) Quantum Wells
Creators: name: Ruiz-Cigarrillo, O.
name: Lastras-Martínez, L. F.
name: Cerda-Méndez, E. A.
name: Flores-Rangel, G.
name: Bravo-Velazquez, C. A.
name: Balderas-Navarro, R. E.
name: Lastras-Martínez, A.
name: Ulloa-Castillo, N. A.
name: Biermann, K.
name: Santos, P. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In the present work, we were able to identify and characterize a new source of in-plane optical anisotropies (IOAs) occurring in asymmetric DQWs; namely a reduction of the symmetry from $D_{2d}$ to $C_{2v}$ as imposed by asymmetry along the growth direction. We report on reflectance anisotropy spectroscopy (RAS) of double GaAs quantum wells (DQWs) structures coupled by a thin ($<2$ nm) tunneling barrier. Two groups of DQWs systems were studied: one where both QWs have the same thickness (symmetric DQW) and another one where they have different thicknesses (asymmetric DQW). RAS measures the IOAs arising from the intermixing of the heavy- and light- holes in the valence band when the symmetry of the DQW system is lowered from $D_{2d}$ to $C_{2v}$. If the DQW is symmetric, residual IOAs stem from the asymmetry of the QW interfaces; for instance, associated to Ga segregation into the AlGaAs layer during the epitaxial growth process. In the case of an asymmetric DQW with QWs with different thicknesses, the AlGaAs layers (that are sources of anisotropies) are not distributed symmetrically at both sides of the tunneling barrier. Thus, the system losses its inversion symmetry yielding an increase of the RAS strength. The RAS line shapes were compared with reflectance spectra in order to assess the heavy- and light- hole mixing induced by the symmetry breakdown. The energies of the optical transitions were calculated by numerically solving the one-dimensional Schrödinger equation using a finite-differences method. Our results are useful for interpretation of the transitions occurring in both, symmetric and asymmetric DQWs.
Aging in Dense Colloids as Diffusion in the Logarithm of Time
Creators: name: Boettcher, S.
name: Sibani, P.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The far-from-equilibrium dynamics of glassy systems share important phenomenological traits. A transition is generally observed from a time-homogeneous dynamical regime to an aging regime where physical changes occur intermittently and, on average, at a decreasing rate. It has been suggested that a global change of the independent time variable to its logarithm may render the aging dynamics homogeneous: for colloids, this entails diffusion but on a logarithmic time scale. Our novel analysis of experimental colloid data confirms that the mean square displacement grows linearly in time at low densities and shows that it grows linearly in the logarithm of time at high densities. Correspondingly, pairs of particles initially in close contact survive as pairs with a probability which decays exponentially in either time or its logarithm. The form of the Probability Density Function of the displacements shows that long-ranged spatial correlations are very long-lived in dense colloids. A phenomenological stochastic model is then introduced which relies on the growth and collapse of strongly correlated clusters ("dynamic heterogeneity"), and which reproduces the full spectrum of observed colloidal behaviors depending on the form assumed for the probability that a cluster collapses during a Monte Carlo update. In the limit where large clusters dominate, the collapse rate is ~1/t, implying a homogeneous, log-Poissonian process that qualitatively reproduces the experimental results for dense colloids. Finally an analytical toy-model is discussed to elucidate the strong dependence of the simulation results on the integrability (or lack thereof) of the cluster collapse probability function.
description: 6 pages, extensively revised, final version; for related work, see http://www.physics.emory.edu/faculty/boettcher/ or http://www.fysik.sdu.dk/staff/staff-vip/pas-personal.html
Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin
Creators: name: Sushkov, A. B.
name: Mostovoy, M.
name: Aguilar, R. Valdes
name: Cheong, S. -W.
name: Drew, H. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We summarize the existing experimental data on electromagnons in multiferroic RMn2O5 compounds, where R denotes a rare earth ion, Y or Bi, and discuss a realistic microscopic model of these materials based on assumption that the microscopic mechanism of magnetically-induced ferroelectricity and electromagnon absorption relies entirely on the isotropic Heisenberg exchange and magnetostrictive coupling of spins to a polar lattice mode and does not involve relativistic effects. This model explains many magnetic and optical properties of RMn2O5 manganites, such as the spin re-orientation transition, magnetically-induced polarisation, appearance of the electromagnon peak in the non-collinear spin state and the polarisation of light for which this peak is observed. We compare experimental and theoretical results on electromagnons in RMn2O5 and RMnO3 compounds.
description: 20 pages, 9 figures, to be published in J. Phys.: Condens. Matter, special issue on multiferroics
Design rule for the emission linewidth of Eu$^{2+}$-activated phosphors
Creators: name: Jia, Yongchao
name: Poncé, Samuel
name: Miglio, Anna
name: Mikami, Masayoshi
name: Gonze, Xavier
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study from first principles the emission linewidth of Eu$^{2+}$-doped LED phosphors. Based on the one-dimensional configuration coordinate model, an analysis of first principles data obtained for fifteen compounds show that, at working temperature, the linewidth of Eu$^{2+}$ emission band in solids is negligibly affected by quantum effects, and can be extracted from the Franck-Condon energy shifts. For a fixed Stokes shift, the difference of Franck-Condon energy shifts in the excited and ground states is the key factor for the FWHM determination. Narrow emission Eu$^{2+}$-doped LED phosphors are expected for the case with large positive value of such difference.
description: 6 pages, 4 figures
Galaxy And Mass Assembly (GAMA) Survey: The Merging Potential of Brightest Group Galaxies
Creators: name: Banks, Kirsten
name: Brough, Sarah
name: Holwerda, Benne
name: Hopkins, Andrew
name: López-Sánchez, Ángel
name: Phillipps, Steven
name: Pimbblet, Kevin
name: Robotham, Aaron
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using a volume-limited sample of 550 groups from the Galaxy And Mass Assembly (GAMA) Galaxy Group Catalogue spanning the halo mass range $12.8 < \log [M_{h}/M] < 14.2$, we investigate the merging potential of central Brightest Group Galaxies (BGGs). We use spectroscopically-confirmed close-companion galaxies as an indication of the potential stellar mass build-up of low-redshift BGGs, $z \leq 0.2$. We identify 17 close-companion galaxies with projected separations $r_{p} < 30$ kpc, relative velocities $Δv \leq 300$ km s$^{-1}$, and stellar-mass ratios $M_{BGG}/M_{CC} \leq 4$ relative to the BGG. These close-companion galaxies yield a total pair fraction of $0.03 \pm 0.01$. Overall, we find that BGGs in our sample have the potential to grow in stellar mass due to mergers by $2.2 \pm 1.5\%$ Gyr$^{-1}$. This is lower than the stellar mass growth predicted by current galaxy evolution models.
description: 12 pages, 7 figures, Accepted for publication by ApJ
The State of the Art when using GPUs in Devising Image Generation Methods Using Deep Learning
Creators: name: Kawahata, Yasuko
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences

description: Deep learning is a technique for machine learning using multi-layer neural networks. It has been used for image synthesis and image recognition, but in recent years, it has also been used for various social detection and social labeling. In this analysis, we compared (1) the number of Iterations per minute between the GPU and CPU when using the VGG model and the NIN model, and (2) the number of Iterations per minute by the number of pixels when using the VGG model, using an image with 128 pixels. When the number of pixels was 64 or 128, the processing time was almost the same when using the GPU, but when the number of pixels was changed to 256, the number of iterations per minute decreased and the processing time increased by about three times. In this case study, since the number of pixels becomes core dumping when the number of pixels is 512 or more, we can consider that we should consider improvement in the vector calculation part. If we aim to achieve 8K highly saturated computer graphics using neural networks, we will need to consider an environment that allows computation even when the size of the image becomes even more highly saturated and massive, and parallel computation when performing image recognition and tuning.
description: 13 pages
FaBIM - Fabriken ganzheitlich planen, bauen und betreiben mit Building Information Modeling
Creators: name: Bermpohl, Fabian
name: Forte, Sven
name: Potthoff, Marcel
name: Lenz, Lisa
name: :Unav
Publisher: name: Fraunhofer-Gesellschaft
Year: 2024
Subjects: Building Information Modeling
BIM
Common Data Environment
Modellprüfung
Fabrikplanung
Automatisierung

description: Jedes Jahr werden in Deutschland ca. 5.820 genehmigungspflichtige Fabrik- und Werkstattgebäude mit einem Gesamtkostenvolumen von 4,72 Milliarden Euro fertiggestellt. Bei 60 % der Projekte werden die Kostenziele um etwa 10 % verfehlt, dies entspricht Mehrkosten von ca. 283 Millionen Euro pro Jahr. Um dieser Problemstellung zu begegnen, müssen in der Fabrikplanung neue Ansätze gefunden werden die Zielerreichung zu verbessern. An dieser Stelle setzt die Methodik des Building Information Modeling (BIM) an, die eine Kostenreduktion im Bereich der Bauwirtschaft von bis zu 25 % verspricht. Auf der Grundlage eines ganzheitlichen open-BIM basierten Vorgehensmodells für die Fabrikplanung wird ein Common Data Environment (CDE) entwickelt, welches den modellbasierten Informationsaustausch aller Beteiligten softwaretechnisch umsetzt. Am Beispiel einer im Projekt entwickelten fiktiven Beispiel-Batteriezellfabrik wird das Projektmanagement und die Modellkoordination über die CDE vorgestellt. Es werden automatisierte Regelprüfungen an den Schnittstellen zwischen den Domänen Gebäude und Produktionssystem vorgestellt, welche direkt über die CDE durchgeführt werden können.
Searching for Axion-Like Particles from Core-Collapse Supernovae with Fermi LAT's Low Energy Technique
Creators: name: Crnogorčević, Milena
name: Caputo, Regina
name: Meyer, Manuel
name: Omodei, Nicola
name: Gustafsson, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Light axion-like particles (ALPs) are expected to be abundantly produced in core-collapse supernovae (CCSNe), resulting in a $\sim$10-second long burst of ALPs. These particles subsequently undergo conversion into gamma-rays in external magnetic fields to produce a long gamma-ray burst (GRB) with a characteristic spectrum peaking in the 30--100-MeV energy range. At the same time, CCSNe are invoked as progenitors of {\it ordinary} long GRBs, rendering it relevant to conduct a comprehensive search for ALP spectral signatures using the observations of long GRB with the \textit{Fermi} Large Area Telescope (LAT). We perform a data-driven sensitivity analysis to determine CCSN distances for which a detection of an ALP signal is possible with the LAT's low-energy (LLE) technique which, in contrast to the standard LAT analysis, allows for a a larger effective area for energies down to 30~MeV. Assuming an ALP mass $m_a \lesssim 10^{-10}$~eV and ALP-photon coupling $g_{aγ} = 5.3\times 10^{-12}$ GeV$^{-1}$, values considered and deduced in ALP searches from SN1987A, we find that the distance limit ranges from $\sim\!0.5$ to $\sim\!10$~Mpc, depending on the sky location and the CCSN progenitor mass. Furthermore, we select a candidate sample of twenty-four GRBs and carry out a model comparison analysis in which we consider different GRB spectral models with and without an ALP signal component. We find that the inclusion of an ALP contribution does not result in any statistically significant improvement of the fits to the data. We discuss the statistical method used in our analysis and the underlying physical assumptions, the feasibility of setting upper limits on the ALP-photon coupling, and give an outlook on future telescopes in the context of ALP searches.
description: 15 pages, 8 figures, accepted by Physical Review D
title: ÐÐµÑÐµÐ´Ð¾Ð²ÑÐµ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²ÐµÐ½Ð½ÑÐµ ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¸: ÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½ÑÐµ (ÑÑÐ¿ÐµÑÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½ÑÐµ) ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¸ Ð¸ Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ñ Ð½Ð°ÑÐºÐ¾ÐµÐ¼ÐºÐ¸Ñ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²
title: ÑÐ±Ð¾ÑÐ½Ð¸Ðº ÑÐµÐ·Ð¸ÑÐ¾Ð² Ð´Ð¾ÐºÐ»Ð°Ð´Ð¾Ð² ÐÐ°ÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ð¹ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ¾Ð¹ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ð¸ Ñ Ð¼ÐµÐ¶Ð´ÑÐ½Ð°ÑÐ¾Ð´Ð½ÑÐ¼ ÑÑÐ°ÑÑÐ¸ÐµÐ¼, 26 Ð¼Ð°Ñ 2023 Ð³Ð¾Ð´Ð°
titleType: Subtitle
Creators: name: "ÐÐµÑÐµÐ´Ð¾Ð²ÑÐµ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²ÐµÐ½Ð½ÑÐµ ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¸: ÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½ÑÐµ (ÑÑÐ¿ÐµÑÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½ÑÐµ) ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¸ Ð¸ Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ñ Ð½Ð°ÑÐºÐ¾ÐµÐ¼ÐºÐ¸Ñ  Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²", Ð½Ð°ÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð°Ñ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ°Ñ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ñ Ñ Ð¼ÐµÐ¶Ð´ÑÐ½Ð°ÑÐ¾Ð´Ð½ÑÐ¼ ÑÑÐ°ÑÑÐ¸ÐµÐ¼ (2023; Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³)
Publisher: name: ÐÐÐÐÐ¢ÐÐ¥-ÐÐ ÐÐ¡Ð¡
Year: 2023
Subjects: ÐÑÐ¾Ð¼ÑÑÐ»ÐµÐ½Ð½ÑÐµ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ
ÐÐ½ÑÐ¾ÑÐ¼Ð°ÑÐ¸Ð¾Ð½Ð½ÑÐµ ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¸
Ð½Ð°ÑÐºÐ¾ÐµÐ¼ÐºÐ¸Ðµ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²Ð°

description: Ð ÑÐ±Ð¾ÑÐ½Ð¸ÐºÐµ Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÐµÐ½Ñ ÑÐµÐ·Ð¸ÑÑ Ð½Ð°ÑÑÐ½ÑÑ Ð´Ð¾ÐºÐ»Ð°Ð´Ð¾Ð² ÐÐ°ÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ð¹ Ð½Ð°ÑÑÐ½Ð¾-Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ¾Ð¹ ÐºÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ð¸ Ñ Ð¼ÐµÐ¶Ð´ÑÐ½Ð°ÑÐ¾Ð´Ð½ÑÐ¼ ÑÑÐ°ÑÑÐ¸ÐµÐ¼ Â«ÐÐµÑÐµÐ´Ð¾Ð²ÑÐµ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²ÐµÐ½Ð½ÑÐµ ÑÐµÑÐ½Ð¾Ð»Ð¾Ð³Ð¸Ð¸: ÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½ÑÐµ (ÑÑÐ¿ÐµÑÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½ÑÐµ) ÑÐµÑÐ½Ð¾Ð»Ð¾Ð³Ð¸Ð¸ Ð¸ Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ñ Ð½Ð°ÑÐºÐ¾ÐµÐ¼ÐºÐ¸Ñ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ²Â». ÐÐ¾Ð½ÑÐµÑÐµÐ½ÑÐ¸Ñ Ð¿ÑÐ¾Ð²Ð¾Ð´Ð¸ÑÑÑ Ð¿ÑÐ¸ Ð¿Ð¾Ð´Ð´ÐµÑÐ¶ÐºÐµ ÐÐ¾Ð¼Ð¸ÑÐµÑÐ° Ð¿Ð¾ Ð¿ÑÐ¾Ð¼ÑÑÐ»ÐµÐ½Ð½Ð¾Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐ¸ÐºÐµ, Ð¸Ð½Ð½Ð¾Ð²Ð°ÑÐ¸ÑÐ¼ Ð¸ ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ðµ Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³Ð°. ÐÐ°ÑÑÐ½ÑÐµ Ð´Ð¾ÐºÐ»Ð°Ð´Ñ Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ñ ÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½ÑÐ¼ (ÑÑÐ¿ÐµÑÐºÐ¾Ð¼Ð¿ÑÑÑÐµÑÐ½ÑÐ¼) ÑÐµÑÐ½Ð¾Ð»Ð¾Ð³Ð¸ÑÐ¼ Ð¸ Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ð¸ Ð½Ð°ÑÐºÐ¾ÐµÐ¼ÐºÐ¸Ñ Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´ÑÑÐ². ÐÐ´ÑÐµÑÐ¾Ð²Ð°Ð½Ð¾ ÑÐ¸ÑÐ¾ÐºÐ¾Ð¼Ñ ÐºÑÑÐ³Ñ ÑÐ¸ÑÐ°ÑÐµÐ»ÐµÐ¹: ÑÐ¿ÐµÑÐ¸Ð°Ð»Ð¸ÑÑÐ°Ð¼ Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ð¹, Ð½Ð°ÑÑÐ½ÑÐ¼ ÑÐ°Ð±Ð¾ÑÐ½Ð¸ÐºÐ°Ð¼, Ð¿ÑÐµÐ¿Ð¾Ð´Ð°Ð²Ð°ÑÐµÐ»ÑÐ¼ Ð¸ ÑÑÑÐ´ÐµÐ½ÑÐ°Ð¼.
Ein System und Verfahren für die effiziente und reproduzierbare Maschinenaufstellung
Creators: name: Wabner, Markus
name: Kolouch, Martin
name: :Unav
Publisher: name: Fraunhofer-Gesellschaft
Year: 2024
Subjects: Maschinenaufstellung
Aufstelleinheit
Assistenzsystem
Sensorik
Aktorik
machine mounting
mounting unit
assistant system
sensor
actuator

description: Die Erfindung bezieht sich auf ein Verfahren und ein System zur teil- oder vollautomatischen Maschinenausrichtung, welches mittels mechanischer Schnittstellen flexibel während der Maschinenaufstellung oder Maschinenausrichtung oder zu Analyse- und Nachstellzwecken an die Maschinenaufstelleinheiten angekoppelt werden kann und eine Verstellung der Maschinenaufstelleinheiten ermöglicht.
description: The invention relates to a method and a system for partially or fully automatic machine alignment, which can be flexibly coupled to the machine mounting units by means of mechanical interfaces during machine installation or machine alignment or for analysis and adjustment purposes and enables the machine installation units to be adjusted.
Survey on personnel resource planning in warehouses DACH region
Creators: name: Kretschmer, Alina
name: Minkhofer, Stephan
name: Schmeltzpfenning, Kira
name: Maier, Daniela
name: Wienninger, Lutz-Friedrich
name: Manemann, Jona
name: :Unav
Publisher: name: Fraunhofer-Gesellschaft
Year: 2024
Subjects: RPS
Resource Planning System
Resourcs Planning
Personnel Resource Planning
Logistics IT
Warehouse Logistics
Intralogistik
Personelle Ressourcenplanung
Ressourcenplanungssystem
Ressourcenplanung
Logistik IT

description: The correct planning of personnel resources in warehouses poses major challenges for many companies. Increasing fluctuations in the volume and structure of incoming orders and the decreasing availability of urgently needed skilled workers are just two of the many challenges in day-to-day warehouse operations. Resource planning systems (RPS) can help to plan personnel resources efficiently. Based on the processes, the order load and the available personnel, an RPS optimizes personnel deployment, taking into account qualitative and quantitative employee capacities. The survey on personnel resource planning in warehouses creates transparency about the current use of resource planning systems in warehouses in the DACH-region and spreads knowledge about possible tools and methods for personnel resource planning in logistics. The survey was conducted by Fraunhofer IML via online questionnaires and took place in the period from 2nd of January 2024 to 5th of May 2024. 75 locations participated. Various industries and company sizes were integrated to provide a comprehensive overview of the usage of resource planning systems. The survey was conducted in Europe with focus on the DACH region, Italy, France, Poland, UK and Spain.
Boltzmann limit for a homogenous Fermi gas with dynamical Hartree-Fock interactions in a random medium
Creators: name: Chen, Thomas
name: Rodnianski, Igor
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 81T08, 81T18, 82C10, 82C44

description: We study the dynamics of the thermal momentum distribution function for an interacting, homogenous Fermi gas on $\Z^3$ in the presence of an external weak static random potential, where the pair interactions between the fermions are modeled in dynamical Hartree-Fock theory. We determine the Boltzmann limits associated to different scaling regimes defined by the size of the random potential, and the strength of the fermion interactions.
description: 54 pages, 1 figure
Creative Economy International experiences and interactions with universities
Creators: name: Emmendoerfer, Magnus
Publisher: name: Zenodo
Year: 2021
Subjects: Creative Economy

description: Apresentação inicial realizada no Encontro Internacional de Territórios Criativos, realizado no dia 19/11/2021: 10:00 - 11:30 Creative Economy International experiences and interactions

 Coordination and inicial lecture: Magnus Emmendoerfer - GDTeC-UFV - Viçosa - MG - Brazil
 Panelist 1 - Experiences in metropolitan regions - Lisbon case
 Susy Silva - Lisboa Town Hall - Innovation and Economy Department, Lisbon City Hall
 Panelist 2 - Experiences in promising regions - Buinho case in Baixo Alentejo
 Carlos Alcobia - Buinho Creative Hub, Founder and General Director (Portugal)
 Debater and audience interaction - Mary Asthon - Professor at FEEVALE University - Novo Hamburgo - RS - Brazil
Colliders and Cosmology
Creators: name: Olive, Keith A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Dark matter in variations of constrained minimal supersymmetric standard models will be discussed. Particular attention will be given to the comparison between accelerator and direct detection constraints.
description: Expanded version of arXiv:0709.3303 [hep-ph], to be published in "Supersymmetry on the Eve of the LHC" a special volume of European Physical Journal C, Particles and Fields (EPJC) in memory of Julius Wess. 25 pages, 47 figures
An Optical Voltage Sensor Based on Piezoelectric Thin Film for Grid Applications
Creators: name: Edmunds, Jordan L.
name: Sonmezoglu, Soner
name: Martens, Julien
name: Von Meier, Alexandra
name: Maharbiz, Michel M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Continuous monitoring of voltages ranging from tens to hundreds of kV over environmental conditions, such as temperature, is of great interest in power grid applications. This is typically done via instrument transformers. These transformers, although accurate and robust to environmental conditions, are bulky and expensive, limiting their use in microgrids and distributed sensing applications. Here, we present a millimeter-sized optical voltage sensor based on piezoelectric aluminum nitride (AlN) thin film for continuous measurements of AC voltages <350kVrms (via capacitive division) that avoids the drawbacks of existing voltage-sensing transformers. This sensor operated with 110uW incident optical power from a low-cost LED achieved a resolution of 170mVrms in a 5kHz bandwidth, a measurement inaccuracy of 0.04% due to sensor nonlinearity, and a gain deviation of +/-0.2% over the temperature range of ~20-60C. The sensor has a breakdown voltage of 100V, and its lifetime can meet or exceed that of instrument transformers when operated at voltages <42Vrms. We believe that our sensor has the potential to reduce the cost of grid monitoring, providing a path towards more distributed sensing and control of the grid.
Interplay between Jahn-Teller instability, uniaxial magnetism and ferroelectricity in Ca3CoMnO6
Creators: name: Zhang, Y.
name: Xiang, H. J.
name: Whangbo, M. -H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ca3CoMnO6 is composed of CoMnO6 chains made up of face-sharing CoO6 trigonal prisms and MnO6 octahedra. The structural, magnetic, and ferroelectric properties of this compound were investigated on the basis of density functional theory calculations. Ca3CoMnO6 is found to undergo a Jahn-Teller distortion associated with the CoO6 trigonal prisms containing high-spin Co2+ (d7) ions, which removes the C3 rotational symmetry and hence uniaxial magnetism. However, the Jahn-Teller distortion is not strong enough to fully quench the orbital moment of the high-spin Co2+ ions thereby leading to an electronic state with substantial magnetic anisotropy. The Jahn-Teller distorted Ca3CoMnO6 in the magnetic ground state with up-up-down-down spin arrangement is predicted to have electric polarizations much greater than experimentally observed. Implications of the discrepancy between theory and experiment were discussed.
description: Phys. Rev. B, in press
Integrated Inline Characterisation Techniques for Improved Silicon Heterojunction Solar Cell Production
Creators: name: Diestel, Christian
name: Senthil Kumar, Saravana Kumar
name: Wörnhör, Alexandra
name: Burkhardt, Daniel
name: Wöhrle, Nico
name: Haunschild, Jonas
name: Demant, Matthias
name: Pingel, Sebastian
name: Rein, Stefan
name: :Unav
Publisher: name: Fraunhofer-Gesellschaft
Year: 2024
Subjects: HJT
Inline Characterisation
SHJ
Silicon Heterojunction
Silicon Solar Cells

description: Silicon heterojunction (SHJ) technology is gaining market share in photovoltaics due to its lean process sequence, high efficiency potential and low CO2 footprint. Margins for improvement in performance, yield and cost are decreasing, while at the same time the benefit of even small gains is growing with production volume. It is therefore worthwhile to implement detailed monitoring of process parameters as well as inline characterisation of the cell precursors during production. In this contribution, we present an overview of inline characterisation techniques that are relevant to SHJ cell production and critically discuss their benefits and weaknesses with the help of some showcase examples. We find that inline characterisation is useful at multiple stages of production. Measurements between processing steps allow early detection of defective wafers, preventing unnecessary processing. They also permit evaluation of the performance of individual manufacturing processes. As one prominent example, we demonstrate the generation of highly-resolved thickness maps of the amorphous silicon and transparent conducting oxide layers using reflection spectroscopy combined with multispectral imaging, as well as physical and machine learning models. This method provides information at an unprecedented level of detail about the layer deposition processes that are at the heart of SHJ technology.
Inconstancy of finite and infinite sequences
Creators: name: Allouche, Jean-Paul
name: Maillard-Teyssier, Laurence
Publisher: name: arXiv
Year: 2009
Subjects: subject: Differential Geometry (math.DG)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 53C65, 52C45, 37M10, 11B85, 52A38, 51M25, 28A75, 62M10, 52A10, 68R15

description: In order to study large variations or fluctuations of finite or infinite sequences (time series), we bring to light an 1868 paper of Crofton and the (Cauchy-)Crofton theorem. After surveying occurrences of this result in the literature, we introduce the inconstancy of a sequence and we show why it seems more pertinent than other criteria for measuring its variational complexity. We also compute the inconstancy of classical binary sequences including some automatic sequences and Sturmian sequences.
description: Accepted by Theoretical Computer Science
Superconductivity in hole-doped (Sr$_{1-x}$K$_x$)Fe$_2$As$_2$
Creators: name: Chen, G. F.
name: Li, Z.
name: Li, G.
name: Hu, W. Z.
name: Dong, J.
name: Zhang, X. D.
name: Zheng, P.
name: Wang, N. L.
name: Luo, J. L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A series of layered (Sr$_{1-x}$K$_x$)Fe$_2$As$_2$ compounds with nominal x=0 to 0.40 are synthesized by solid state reaction method. Similar to other parent compounds of iron-based pnictide superconductors, the pure SrFe$_2$As$_2$ shows a strong resistivity anomaly near 210 K, which was ascribed to the spin-density-wave instability. The anomaly temperature is much higher than those observed in LaOFeAs and BaFe$_2$As$_2$, the two prototype parent compounds with ZrCuSiAs- and ThCr$_2$Si$_2$-type structures. K-doping strongly suppresses this anomaly and induces superconductivity. Like in the case of K-doped BaFe$_2$As$_2$, sharp superconducting transitions at T$_c\sim$38 K was observed. We performed the Hall coefficient measurement, and confirmed that the dominant carriers are hole-type. The carrier density is enhanced by a factor of 3 in comparison to F-doped LaOFeAs superconductor.
description: 3 pages, 3 figures
Investigation of the Physical Origin of Overionized Recombining Plasma in the Supernova Remnant IC 443 with XMM-Newton
Creators: name: Okon, Hiromichi
name: Tanaka, Takaaki
name: Uchida, Hiroyuki
name: Tsuru, Takeshi Go
name: Seta, Masumichi
name: Kokusho, Takuma
name: Smith, Randall K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The physical origin of the overionized recombining plasmas (RPs) in supernova remnants (SNRs) has been attracting attention because its understanding provides new insight into SNR evolution. However, the process of the overionization, although it has been discussed in some RP-SNRs, is not yet fully understood. Here we report on spatially resolved spectroscopy of X-ray emission from IC~443 with {\it XMM-Newton}. We find that RPs in regions interacting with dense molecular clouds tend to have lower electron temperature and lower recombination timescale. These tendencies indicate that RPs in these regions are cooler and more strongly overionized, which is naturally interpreted as a result of rapid cooling by the molecular clouds via thermal conduction. Our result on IC~443 is similar to that on W44 showing evidence for thermal conduction as the origin of RPs at least in older remnants. We suggest that evaporation of clumpy gas embedded in a hot plasma rapidly cools the plasma as was also found in the W44 case. We also discuss if ionization by protons accelerated in IC~443 is responsible for RPs. Based on the energetics of particle acceleration, we conclude that the proton bombardment is unlikely to explain the observed properties of RPs.
description: 11 pages, 10 figures, 4 tables, accepted for publication in ApJ. arXiv admin note: text overlap with arXiv:1912.08129
Dynamics of Information Entropies in Nonextensive Systems
Creators: name: Hasegawa, Hideo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have discussed dynamical properties of the Tsallis entropy and the generalized Fisher information in nonextensive systems described by the Langevin model subjected to additive and multiplicative noise. Analytical expressions for the time-dependent Tsallis entropy and generalized Fisher information have been obtained with the use of the $q$-moment approach to the Fokker-Planck equation developed in a previous study [H. Hasegawa, Phys. Rev. E {\bf 77}, 031133 (2008)]. Model calculations of the information entropies in response to an applied pulse and sinusoidal inputs have been presented.
description: 21 pages, 8 figures, augmented text with changed title
Universal dephasing in a chiral 1D interacting fermion system
Creators: name: Neuenhahn, Clemens
name: Marquardt, Florian
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider dephasing by interactions in a one-dimensional chiral fermion system (e.g. a Quantum Hall edge state). For finite-range interactions, we calculate the spatial decay of the Green's function at fixed energy, which sets the contrast in a Mach-Zehnder interferometer. Using a physically transparent semiclassical ansatz, we find a power-law decay of the coherence at high energies and zero temperature (T=0), with a universal asymptotic exponent of 1, independent of the interaction strength. We obtain the dephasing rate at T>0 and the fluctuation spectrum acting on an electron.
description: 5 pages, 3 figures; minor changes, version as published;
Charge completeness and the massless charge lattice in F-theory models of supergravity
Creators: name: Morrison, David R.
name: Taylor, Washington
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We prove that, for every 6D supergravity theory that has an F-theory description, the property of charge completeness for the connected component of the gauge group (meaning that all charges in the corresponding charge lattice are realized by massive or massless states in the theory) is equivalent to a standard assumption made in F-theory for how geometry encodes the global gauge theory by means of the Mordell-Weil group of the elliptic fibration. This result also holds in 4D F-theory constructions for the parts of the gauge group that come from sections and from 7-branes. We find that in many 6D F-theory models the full charge lattice of the theory is generated by massless charged states; this occurs for each gauge factor where the associated anomaly coefficient satisfies a simple positivity condition. We describe many of the cases where this massless charge sufficiency condition holds, as well as exceptions where the positivity condition fails, and analyze the related global structure of the gauge group and associated Mordell-Weil torsion in explicit F-theory models.
description: 43 pages; v2: comments on charge completeness in M-theory, references added
Complex Burgers' equation in 2D SU(N) YM
Creators: name: Neuberger, H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: An integro-differential equation satisfied by an eigenvalue density defined as the logarithmic derivative of the average inverse characteristic polynomial of a Wilson loop in two dimensional pure Yang Mills theory with gauge group SU(N) is derived from two associated complex Burgers' equations, with viscosity given by 1/(2N). The Wilson loop does not intersect itself and Euclidean space-time is assumed flat and infinite. This result provides an extension of the infinite N solution of Durhuus and Olesen to finite N, but this extension is not unique.
description: 10 pages; fixed typo in eq. 37, updated 1 reference and added 2 minor clarifying comments
History of medicine and development in laboratory sciences
Creators: name: Dunn, Lucille B.
Publisher: name: University of Oregon
Year: 1937
Subjects: History of Medicine

description: The subject which I have chosen for my thesis is one which covers a vast field of knowledge in order to have a glimpse of this great work, which will be little more than an outline, in this short paper, we will go back to the very beginning of medicine.
A Satake isomorphism in characteristic p
Creators: name: Herzig, Florian
Publisher: name: arXiv
Year: 2009
Subjects: subject: Number Theory (math.NT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 20C08, 22E50

description: Suppose that G is a connected reductive group over a p-adic field F, that K is a hyperspecial maximal compact subgroup of G(F), and that V is an irreducible representation of K over the algebraic closure of the residue field of F. We establish an analogue of the Satake isomorphism for the Hecke algebra of compactly supported, K-biequivariant functions f: G(F) \to End V. These Hecke algebras were first considered by Barthel-Livne for GL_2. They play a role in the recent mod p and p-adic Langlands correspondences for GL_2(Q_p), in generalisations of Serre's conjecture on the modularity of mod p Galois representations, and in the classification of irreducible mod p representations of unramified p-adic reductive groups.
description: 24 pages, revised
Pre-torsors and Galois comodules over mixed distributive laws
Creators: name: Böhm, Gabriella
name: Menini, Claudia
Publisher: name: arXiv
Year: 2008
Subjects: subject: Rings and Algebras (math.RA)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: We study comodule functors for comonads arising from mixed distributive laws. Their Galois property is reformulated in terms of a (so-called) regular arrow in Street's bicategory of comonads. Between categories possessing equalizers, we introduce the notion of a regular adjunction. An equivalence is proven between the category of pre-torsors over two regular adjunctions $(N_A,R_A)$ and $(N_B,R_B)$ on one hand, and the category of regular comonad arrows $(R_A,ξ)$ from some equalizer preserving comonad ${\mathbb C}$ to $N_BR_B$ on the other. This generalizes a known relationship between pre-torsors over equal commutative rings and Galois objects of coalgebras.Developing a bi-Galois theory of comonads, we show that a pre-torsor over regular adjunctions determines also a second (equalizer preserving) comonad ${\mathbb D}$ and a co-regular comonad arrow from ${\mathbb D}$ to $N_A R_A$, such that the comodule categories of ${\mathbb C}$ and ${\mathbb D}$ are equivalent.
description: 34 pages LaTeX file. v2: a few typos corrected
On tree-level higher order gravitational couplings in superstring theory
Creators: name: Stieberger, S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider the scattering amplitudes of five and six gravitons at tree-level in superstring theory. Their power series expansions in the Regge slope alpha' are analyzed through the order alpha'^8 showing some interesting constraints on higher order gravitational couplings in the effective superstring action like the absence of R^5 terms. Furthermore, some transcendentality constraints on the coefficients of the non-vanishing couplings are observed: the absence of zeta values of even weight through the order alpha'^8 like the absence of zeta(2) zeta(3) R^6 terms. Our analysis is valid for any superstring background in any space-time dimension, which allows for a conformal field theory description.
description: 4 pages, RevTeX 4.1; v2: Results and discussion extended by the order alpha'^8. Again, no even zeta values occur at this order excluding curvature contact terms with MZV coefficients zeta(8), zeta(2) zeta(3)^2 and zeta(5,3), respectively; v3: streamlined and final version to appear in Physical Review Letters
SETUp Sachsen-Anhalt - Systemische und nachhaltige Energietransformation für die Zukunft der energieintensiven Grundstoffindustrie
Creators: name: Sondej, Franziska Sophia
name: Arlinghaus, Julia
name: Richter, Marc
name: Lombardi, Pio Alessandro
name: Wenge, Christoph
name: Balischewski, Stephan
name: Kögler, Marcus
name: Jentsch, Sebastian
name: Schiffner, Sven
name: Ashkavand, Mostafa
name: Mitchell, Samuel
name: Sandt, Meike Marie
name: :Unav
Publisher: name: Fraunhofer-Gesellschaft
Year: 2025

description: Die Studie untersucht die Herausforderungen und Chancen der energieintensiven Unternehmen in Sachsen-Anhalt und liefert strategische Handlungsempfehlungen für deren Transformation hin zu einer klimaneutralen und wirtschaftlich zukunftsfähigen Energieversorgung. Die Studie wurde im Auftrag des Ministeriums für Umwelt, Energie, Klimaschutz und Wissenschaft Sachsen-Anhalt durchgeführt und kombiniert technologische Innovationen mit wirtschaftlichen Ansätzen, um eine nachhaltige und wettbewerbsfähige Industrie zu fördern. Kern der Studie ist eine systematische Analyse der Herausforderungen und Bedarfe energieintensiver Unternehmen sowie die Entwicklung unternehmensspezifischer und standortübergreifender Transformationsstrategien zur Nutzung von Energie- und Ressourcenpotenzialen.
Turbulence in electromagnetically-driven Keplerian flows
Creators: name: Vernet, Marlone
name: Pereira, Michael
name: Fauve, Stephan
name: Gissinger, Christophe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The flow of an electrically conducting fluid in a thin disc under the action of an azimuthal Lorentz force is studied experimentally. At small forcing, the Lorentz force is balanced by either viscosity or inertia, yielding quasi-Keplerian velocity profiles. For very large current and moderate magnetic field, we observe a new regime, fully turbulent, which exhibits large fluctuations and a Keplerian mean rotation profile $Ω\sim \frac{\sqrt{IB}}{r^{3/2}}$. In this turbulent regime, the dynamics is typical of thin layer turbulence, characterized by a direct cascade of energy towards the small scales and an inverse cascade to large scale. Finally, at very large magnetic field, this turbulent flow bifurcates to a quasi-bidimensional turbulent flow involving the formation of a large scale condensate in the horizontal plane. These results are well understood as resulting from an instability of the Bödewadt-Hartmann layers at large Reynolds number and discussed in the framework of similar astrophysical flows.
description: 30 pages, 12 figures