cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Transport in a Clean Graphene Sheet at Finite Temperature and Frequency
Creators: name: Peres, N. M. R.
name: Stauber, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We calculate the conductivity of a clean graphene sheet at finite temperatures starting from the tight-binding model. We obtain a finite value for the dc-conductivity at zero temperature. For finite temperature, the spontaneous electron-hole creation, responsible for the finite conductivity at zero temperature, is washed out and the dc-conductivity yields zero. Our results are in agreement with calculations based on the field-theoretical model for graphene.
description: 8 pages, 1 figure
The effects of different Type Ia SN yields on Milky Way chemical evolution
Creators: name: Palla, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study the effect of different Type Ia SN nucleosynthesis prescriptions on the Milky Way chemical evolution. To this aim, we run detailed one-infall and two-infall chemical evolution models, adopting a large compilation of yield sets corresponding to different white dwarf progenitors (near-Chandrasekar and sub-Chandrasekar) taken from the literature. We adopt a fixed delay time distribution function for Type Ia SNe , in order to avoid degeneracies in the analysis of the different nucleosynthesis channels. We also combine yields for different Type Ia SN progenitors in order to test the contribution to chemical evolution of different Type Ia SN channels. The results of the models are compared with recent LTE and NLTE observational data. We find that "classical" W7 and WDD2 models produce Fe masses and [$α$/Fe] abundance patterns similar to more recent and physical near-Chandrasekar and sub- Chandrasekar models. For Fe-peak elements, we find that the results strongly depend either on the white dwarf explosion mechanism (deflagration-to-detonation, pure deflagration, double detonation) or on the initial white dwarf conditions (central density, explosion pattern). The comparison of chemical evolution model results with observations suggests that a combination of near-Chandrasekar and sub-Chandrasekar yields is necessary to reproduce the data of V, Cr, Mn and Ni, with different fractions depending on the adopted massive stars stellar yields. This comparison also suggests that NLTE and singly ionised abundances should be definitely preferred when dealing with most of Fe-peak elements at low metallicity.
description: 17 pages, 15 figures, 4 tables. Accepted for publication in MNRAS
A New Zealand White Rabbit Model of Thrombocytopenia and Coagulopathy Following Total Body Irradiation Across the Dose Range to Induce the Hematopoietic-Subsyndrome of Acute Radiation Syndrome
Creators: name: Jackson, Isabel L.
name: Gurung, Ganga
name: Poirier, Yannick
name: Gopalakrishnan, Mathangi
name: Cohen, Eric P.
name: Shea-Donohue, Terez
name: Newman, Diana
name: Vujaskovic, Zeljko
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Pharmacology
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy
subject: Hematology
subject: 60506 Virology
subject: Computational Biology

description: Purpose: The purpose if this study was to develop a rabbit model of total body irradiation (TBI) -induced thrombocytopenia and coagulopathy across the dose-range which induces the hematopoietic subsyndrome of the acute radiation syndrome (H-ARS). Methods: Twenty male New Zealand White rabbits were assigned to arms to receive 6-MV of TBI at a dose of 6.5, 7.5, 8.5 or 9.5 Gy. Animals were treated with moderate levels of supportive care including buprenorphine for pain management, antibiotics, antipyretics for rectal body temperature >104.8 °F, and fluids for signs of dehydration. Animals were closelyfollowed for up to 45 days after TBI for signs of major morbidity/mortality. Hematology and serum chemistry parameters were routinely monitored. Hemostasis parameters were analyzed prior to TBI, 2 and 6 hours post-TBI, and at the time of euthanasia. Results: Animals developed the characteristic signs and symptoms of H-ARS during the first-week post TBI. Animals became thrombocytopenic with signs of severe acute anemia during the second week post TBI. Moribund animals presented with petechia and ecchymosis of the skin and generalized internal hemorrhage. Multiorgan dysfunction characterized by bone marrow failure, gastric ileus, acute renal toxicity, and liver abnormalities were common. Severe abnormalities in coagulation parameters were observed. Conclusions: The presentation of bone marrow failure and multiorogan injury associated with ARS in the New Zealand White rabbit model is consistent with that described in the canine, swine, non-human primate, and in humans. The hemorrhagic syndrome associated with the ARS in rabbits is characterized by thrombocytopenia and hemostasis dysfunction, which appear to underlie the development of multiorgan dysfunction following TBI to rabbits. Taken together, the rabbit recapitulates the pathogenesis of ARS in humans, and may present an alternative small animal model for medical countermeasure pilot efficacy screening, dose-finding and schedule optimization studies prior to moving into large animal models of TBI-induced ARS.
Transition from band insulator to excitonic insulator via alloying Se into Monolayer TiS$_3$: A Computational Study
Creators: name: Dong, Shan
name: Li, Yuanchang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: First-principles density functional theory plus Bethe-Salpeter equation calculations are employed to investigate the electronic and excitonic properties of monolayer titanium trichalcogenide alloys TiS$_{3-x}$Se$_x$ ($x$=1 and 2). It is found that bandgap and exciton binding energy display asymmetric dependence on the substitution of Se for S. While the bandgap can be significantly decreased as compared to that of pristine TiS$_3$, the exciton binding energy just varies a little, regardless of position and concentration of the Se substitution. A negative exciton formation energy is found when the central S atoms are replaced by Se atoms, suggesting a many-body ground state with the spontaneous exciton condensation. Our work thus offers a new insight for engineering an excitonic insulator.
description: Accepted by PRB
Optimal computation with non-unitary quantum walks
Creators: name: Kendon, Viv
name: Maloyer, Olivier
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum versions of random walks on the line and the cycle show a quadratic improvement over classical random walks in their spreading rates and mixing times respectively. Non-unitary quantum walks can provide a useful optimisation of these properties, producing a more uniform distribution on the line, and faster mixing times on the cycle. We investigate the interplay between quantum and random dynamics by comparing the resources required, and examining numerically how the level of quantum correlations varies during the walk. We show numerically that the optimal non-unitary quantum walk proceeds such that the quantum correlations are nearly all removed at the point of the final measurement. This requires only O(log T) random bits for a quantum walk of T steps
description: 16 pages, 3 eps figures, ELsevier style; v2 clarification added to start of Sec. 4, typos fixed & refs updated; v3 error fixed in qubit counts on p. 9, refs updated, to appear (in 2008) in TCS-A postproceedings volume of CiE 2006
title: Text/Conference Paper
Creators: name: Striewe, Michael
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2019
Subjects: subject: E-Assessment
subject: Aufgabengenerierung
subject: Linked Open Data
subject: Semantic Web

description: Automatische Aufgabengenerierung stellt fachspezifische Anforderungen an die ver­wendbaren Techniken. In manchen Fächern erscheint dabei die Nutzung von Linked Open Data vielversprechend. Dieses Paper untersucht am Beispiel der Archäologie die technischen und inhaltlichen Herausforderungen bei der Generierung von Multiple-Choice-Aufgaben. Die Untersuchung kommt zu dem Ergebnis, dass insbesondere die Vollständigkeit und inhaltliche Gewichtung der verfügbaren Daten ein Hindernis für die Realisierung darstellt.
title: Text/Conference Paper
Creators: name: Röpke, René
name: Schroeder, Ulrik
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2019
Subjects: subject: Serious Games
subject: Spielbasiertes Lernen
subject: IT-Sicherheit
subject: Taxonomie
subject: Review

description: Es gibt eine große Vielfalt an Serious Games und spielbasierten Lernanwendungen für unterschiedliche Themenfelder. Um einen Überblick über existierende Spiele für IT-Sicherheit zu erhalten, kann unter Verwendung einer Taxonomie eine Klassifizierung vorgenommen werden. Dieser Beitrag präsentiert das Ergebnis der Anwendung des G/P/S Modells auf eine in systematischer Literatur- und Produktrecherche ermittelten Menge von Serious Games, spielbasierten Lernanwendungen und Lernspielen. Es kann somit als Wegweiser für weitere Forschungsvorhaben dienen.
Evidence of the $Gaia$--VLBI position differences being related to radio source structure
Creators: name: Xu, Ming H.
name: Lunz, Susanne
name: Anderson, James M.
name: Savolainen, Tuomas
name: Zubko, Nataliya
name: Schuh, Harald
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We report the relationship between the $Gaia$--VLBI position differences and the magnitudes of source structure effects in VLBI observations. Because the $Gaia$--VLBI position differences are statistically significant for a considerable number of common sources, we attempt to discuss and explain these position differences based on VLBI observations and available source images at cm-wavelengths. Based on the derived closure amplitude root-mean-square (CARMS), which quantifies the magnitudes of source structure effects in the VLBI observations used for building the third realization of the International Celestial Reference Frame, the arc lengths and normalized arc lengths of the position differences are examined in detail. The radio jet directions and the directions of the $Gaia$--VLBI position differences are investigated for a small sample of sources. Both the arc lengths and normalized arc lengths of the $Gaia$ and VLBI positions are found to increase with the CARMS values. The majority of the sources with statistically significant position differences are associated with the sources having extended structure. Radio source structure is the one of the major factors of these position differences, and it can be the dominate factor for a number of sources. The vectors of the $Gaia$ and VLBI position differences are parallel to the radio-jet directions, which is confirmed with stronger evidence.
description: 13 pages, 7 figures, and 5 tables. Accepted to be published in Astronomy & Astrophysics
title: Text/Conference Paper
Creators: name: Judel, Sven
name: Röpke, René
name: Zaric, Nadja
name: Schroeder, Ulrik
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2019
Subjects: subject: Lernstile
subject: Learning Analytics
subject: Lernumgebungen
subject: Moodle

description: Um Lernende in ihrer Lernumgebung besser zu erfassen und Lehrenden die Möglichkeit zu geben, ihre Lehre zielgruppengerechter zu gestalten, kann ein integriertes Lernstil-Analysesystem zur Verknüpfung von Lernstildaten mit Aktivitäts- und Leistungsdaten verwendet werden. In diesem Beitrag wird ein eben solches System für das Lernmanagementsystem Moodle vorgestellt und die Vorteile der unmittelbaren Integration in Moodle präsentiert.
Nonvanishing spin Hall currents in the presence of magnetic impurities
Creators: name: Wang, Pei
name: Li, You-Quan
name: Zhao, Xuean
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The intrinsic spin Hall conductivity in a two dimensional electron gas with Rashba spin-orbit coupling is evaluated by taking account of anisotropic coupling between magnetic impurities and itinerant electrons. In our calculation Kubo's linear response formalism is employed and the vertex correction is considered. In the semiclassical limit $μ\gg 1/τ$, a non-vanishing spin Hall conductivity $σ^{}_{sH}$ is found to depend on the momentum relaxation time $τ$, spin-orbit splitting $Δ$ and the anisotropic coefficient of interaction between itinerant electrons and magnetic impurities. The clean limit of $σ^{}_{sH}$ is in the region of $e/8π\sim e/6π$, depending on the anisotropic coefficient.
description: Revtex, 6 pages, 4 figures, version to appear in PRB
Glassy Carbon Microelectrode Arrays Enable Voltage-Peak Separated Simultaneous Detection of Dopamine and Serotonin Using Fast Scan Cyclic Voltammetry
Creators: name: Castagnola, Elisa
name: Thongpang, Sanitta
name: Hirabayashi, Mieko
name: Nava, Giorgio
name: Nimbalkar, Surabhi
name: Nguyen, Tri
name: Lara, Sandra
name: Oyawale, Alexis
name: Bunnell, James
name: Moritz, Chet
name: Kassegne, Sam
Publisher: name: arXiv
Year: 2020
Subjects: subject: Biomolecules (q-bio.BM)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: Progress in real-time, simultaneous in vivo detection of multiple neurotransmitters will help accelerate advances in neuroscience research. The need for development of probes capable of stable electrochemical detection of rapid neurotransmitter fluctuations with high sensitivity and selectivity and sub-second temporal resolution has, therefore, become compelling. Additionally, a higher spatial resolution multi-channel capability is required to capture the complex neurotransmission dynamics across different brain regions. These research needs have inspired the introduction of glassy carbon (GC) microelectrode arrays on flexible polymer substrates through carbon MEMS (C-MEMS) microfabrication process followed by a novel pattern transfer technique. These implantable GC microelectrodes offer unique advantages in electrochemical detection of electroactive neurotransmitters through the presence of active carboxyl, carbonyl, and hydroxyl functional groups. In addition, they offer fast electron transfer kinetics, capacitive electrochemical behavior, and wide electrochemical window. Here, we combine the use of these GC microelectrodes with the fast scan cyclic voltammetry (FSCV) technique to optimize the co-detection of dopamine and serotonin in vitro and in vivo. We demonstrate that using optimized FSCV triangular waveform at scan rates lower than 700 V/s and holding and switching at potentials of 0.4 and 1V respectively, it is possible to discriminate voltage reduction and oxidation peaks of serotonin and dopamine, with serotonin contributing distinct multiple oxidation peaks. Taken together, our results present a compelling case for a carbon-based MEA platform rich with active functional groups that allows for repeatable and stable detection of electroactive multiple neurotransmitters at concentrations as low as 10 nM
Sequential and Spontaneous Star Formation Around the Mid-Infrared Halo HII Region KR 140
Creators: name: Kerton, C. R.
name: Arvidsson, K.
name: Knee, Lewis B. G.
name: Brunt, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use 2MASS and MSX infrared observations, along with new molecular line (CO) observations, to examine the distribution of young stellar objects (YSOs) in the molecular cloud surrounding the halo HII region KR 140 in order to determine if the ongoing star-formation activity in this region is dominated by sequential star formation within the photodissociation region (PDR) surrounding the HII region. We find that KR 140 has an extensive population of YSOs that have spontaneously formed due to processes not related to the expansion of the HII region. Much of the YSO population in the molecular cloud is concentrated along a dense filamentary molecular structure, traced by C18O, that has not been erased by the formation of the exciting O star. Some of the previously observed submillimetre clumps surrounding the HII region are shown to be sites of recent intermediate and low-mass star formation while other massive starless clumps clearly associated with the PDR may be the next sites of sequential star formation.
description: Accepted for publication in MNRAS, 8 pages, 10 figures
Grammatical elicitation: Adpositions
Creators: name: Ovelar, Irma Easty
name: Bossi, Madeline
name: Dabkowski, Maksymilian
name: Drummond, Emily
name: Grabowski, Emily
name: Jarvis, Rebecca
name: Khuu, Phuong
name: Michael, Lev
name: Russell, Katherine
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2021
Subjects: subject: gug

description: Adpositional phrases with plural complements and various motion paths. Some picture description tasks.
Particle Dynamics in 3D Self-gravitating Disks II: Strong Gas Accretion and Thin Dust Disks
Creators: name: Baehr, Hans
name: Zhu, Zhaohuan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Observations suggest that protoplanetary disks have moderate accretion rates onto the central young star, especially at early stages (e.g. HL Tau), indicating moderate disk turbulence. However, recent ALMA observations suggest that dust is highly settled, implying weak turbulence. Motivated by such tension, we carry out 3D stratified local simulations of self-gravitating disks, focusing on settling of dust particles in actively accreting disks. We find that gravitationally unstable disks can have moderately high accretion rates while maintaining a relatively thin dust disk for two reasons. First, accretion stress from the self-gravitating spirals (self-gravity stress) can be stronger than the stress from turbulence (Reynolds stress) by a factor of 5-20. Second, the strong gravity from the gas to the dust decreases the dust scale height by another factor of $\sim 2$. Furthermore, the turbulence is slightly anisotropic, producing a larger Reynolds stress than the vertical dust diffusion coefficient. Thus, gravitoturbulent disks have unusually high vertical Schmidt numbers ($Sc_z$) if we scale the total accretion stress with the vertical diffusion coefficient (e.g. $Sc_z\sim$ 10-100). The reduction of the dust scale height by the gas gravity, should also operate in gravitationally stable disks ($Q>$1). Gravitational forces between particles become more relevant for the concentration of intermediate dust sizes, forming dense clouds of dust. After comparing with HL Tau observations, our results suggest that self-gravity and gravity among different disk components could be crucial for solving the conflict between the protoplanetary disk accretion and dust settling, at least at the early stages.
description: 15 pages, 12 figures, Accepted for publication in ApJ
title: Text/Conference Paper
Creators: name: Wiepke, Axel
name: Richter, Eric
name: Zender, Raphael
name: Richter, Dirk
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2019
Subjects: subject: Virtual Reality
subject: Lehrerbildung
subject: Simulation

description: Virtuelle Realitäten ermöglichen Trainingsszenarien, die in der realen Welt nur mit hohem Aufwand oder mit ethischen Bedenken durchgeführt werden können. Dazu gehört das Verhaltenstraining angehender LehrerInnen vor Schulklassen. Dieser Beitrag beschreibt eine für diesen Zweck entwickelte VR-Klassenraumsimulation, in der gezielt Störungen bei simulierten SchülerInnen ausgelöst werden können. Der Einsatz dieser Lösung für das realitätsnahe Training von Klassenmanagementkompetenzen bei Lehramtsstudierenden wird beschrieben und evaluiert, wobei ein Fokus auf dem angemessenen Umgang mit Unterrichtsstörungen liegt.
Linear and Nonlinear Optical constants of BiFeO_3
Creators: name: Kumar, Amit
name: Rai, R.
name: Podraza, Nikolas
name: Denev, Sava
name: Ramirez, Mariola
name: Chu, Ying-Hao
name: Ihlefeld, Jon
name: Heeg, Tassilo
name: Schubert, Jurgen
name: Schlom, Darrell
name: Orenstein, Joseph
name: Ramesh, R.
name: Collins, Robert
name: Musfeldt, Janice
name: Gopalan, Venkatraman
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Using spectroscopic ellipsometry, the refractive index and absorption versus wavelength of the ferroelectric antiferromagnet Bismuth Ferrite, BiFeO_3 is reported. The material has a direct band-gap at 442 nm wavelength (2.81 eV). Using optical second harmonic generation, the nonlinear optical coefficients were determined to be d_15/d_22 = 0.20 +/- 0.01, d_31/d_22 = 0.35 +/- 0.02, d_33/d_22 = -11.4 +/- 0.20 and |d_22| = 298.4 +/- 6.1 pm/V at a fundamental wavelength of 800 nm.
description: 4 pages, 3 figures
title: Text/Conference Paper
Creators: name: Röpke, René
name: Ehlenz, Matthias
name: Leonhardt, Thiemo
name: Schroeder, Ulrik
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2019
Subjects: subject: Automatentheorie
subject: Theoretische Informatik
subject: Lernspiel
subject: Multitouch
subject: Tabletop

description: In diesem Beitrag wird das Konzept und die Implementierung eines Multitouch Lernspiels zur Automatentheorie basierend auf dem an der RWTH Aachen entwickelten MTLG Framework vorgestellt. Es ist ein kollaboratives Lernspiel, welches unterstützt durch Digital Storytelling, einen spielerischen und zielgruppengerechten Einstieg in deterministische endliche Automaten als Themengebiet der Theoretischen Informatik gibt.
Foreign investment in China’s infrastructure: finding the balance between efficiency and development, or, How to attract foreign investment to infrastructure projects without selling the country’s soul to the foreign devils
Creators: name: Stewart, Vivienne Hume
Publisher: name: University of British Columbia
Year: 2009

description: Chinese official plans for the country include more and better infrastructure for which it cannot afford to pay the total cost. China expects foreign investors to provide 20% of the funds needed for this purpose. However, the government and foreign investors do not always have compatible goals or expectations and it appears that actual investment in infrastructure projects will fall short of what is needed. The paper identifies a tension that exists between China's 'development' perspective and the foreign investor's 'efficiency' perspective and attempts to describe what actually happens in the process surrounding the 'making' of an infrastructure project. It also suggests that unless this tension is resolved, China's infrastructure needs will not be met and its economic growth may suffer. The paper distills the nature and characteristics of each perspective from a review in Chapter I of a number of theories concerning the free market, law and economics, and economic development. Using data gleaned from locally accessible printed materials, online databases, and other media, the paper presents case studies of a number of infrastructure projects in Chapter II. In Chapter in, the efficiency and development perspectives are tested in the case study examples by examining three aspects o f infrastructure projects of concern to both China and foreign investors: rate of return, control, and risk. The paper goes on to identify where and how a balance was found, or not found, between the perspectives, leading to the success or failure of the project. Finally, in Chapter IV, the paper summarizes some of the primary obstacles to foreign investment in infrastructure as well as some of the techniques that have been successful in overcoming them. It also advances the proposition that the tension between efficiency and development evidences a fundamental conflict of norms that will not be resolved until the two sides are able to reach some mutuality of understanding combined with a commonality o f purpose, something that will require efficiency-driven foreign investors to reassess not only their goals and expectations, but also their role in the global community.
Deformation Potential Carrier-Phonon Scattering in Semiconducting Carbon Nanotube Transistors
Creators: name: Pennington, G.
name: Akturk, A.
name: Goldsman, N.
name: Wickenden, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Theoretical calculations of carrier transport in single-walled carbon nanotubes are compared with recent experiments. Carrier-phonon scattering is accounted for using the deformation potential approximation. Comparing with experiments, a deformation potential coupling constant of 14eV is determined for semiconducting carbon nanotubes. Theory is shown to closely predict the low-field mobility, on conductance, and on resistance of field-effect transistors as a function of induced nanotube charge density, diameter, and temperature. Results indicate that the device conductance is reduced as multiple subband channels conduct due to strong intersubband scattering. Comparison with experiment allows identification of the mean free path (Lm) in semiconducting carbon nanotubes. As the device turns on, Lm is found to increase significantly. When the device is in the on state, the mean free path (Lm-ON) varies linearly with tube diameter and inversely with temperature. Intersubband scattering is found to strongly decrease Lm-ON when a few subbands are occupied. When 3 subband channels are considered at room temperature, Lm-ON decreases from 570nm to 200nm for a 4nm diameter tube when intersubband scattering is included. Since the subband spacing increases with decreasing tube diameter, the effects of intersubband are reduced for smaller diameters.
description: 11 pages, 6 figures
The $L^p$-Calderón-Zygmund inequality on non-compact manifolds of positive curvature
Creators: name: Marini, Ludovico
name: Veronelli, Giona
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 58J05, 46E35, 53C20, 51F99

description: We construct, for $p>n$, a concrete example of a complete non-compact $n$-dimensional Riemannian manifold of positive sectional curvature which does not support any $L^p$-Calderón-Zygmund inequality: \[ \forall\,φ\in C^{\infty}_c(M),\qquad\|\operatorname{Hess} φ\|_{L^p}\le C(\|φ\|_{L^p}+\|Δφ\|_{L^p}). \] The proof proceeds by local deformations of an initial metric which (locally) Gromov-Hausdorff converge to an Alexandrov space. In particular, we develop on some recent interesting ideas by G. De Philippis and J. Núñez-Zimbron dealing with the case of compact manifolds. As a straightforward consequence, we obtain that the $L^p$-gradient estimates and the $L^p$-Calderón-Zygmund inequalities are generally not equivalent, thus answering an open question in literature. Finally, our example gives also a contribution to the study of the (non-)equivalence of different definitions of Sobolev spaces on manifolds.
description: 11 pages. Comments are welcome
title: Text/Conference Paper
Creators: name: Leonhardt, Thiemo
name: Ehlenz, Matthias
name: Röpke, René
name: Bergner, Nadine
name: Schroeder, Ulrik
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2019
Subjects: subject: framework
subject: simulation
subject: animation
subject: serious games
subject: teacher training
subject: computer science education

description: MTLG is a framework for the creation of animations, simulations and games that focuses on simple operation through multi-touch input, support for didactic implementation and the evaluation of learning data. The framework is completely web-based and therefore system and platform independent. Over several years, prospective computer science teachers and computer science students have used the framework in our e-learning labs and seminars. We have iteratively improved and enhanced the framework and its applications over several use cases in various computer science classes. The framework and all learning applications are available as open educational resources.
Chiral symmetry breaking and chemical equilibrium in a heavy-ion collisions
Creators: name: Gupta, Sourendu
name: Nayak, Jajati K.
name: Singh, Sushant K.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We examine the thermalization of an ensemble of the octet of pseudoscalar mesons, in the isospin symmetric limit, whose interactions are constrained through chiral symmetry, unitarity, and measurements. The reaction amplitudes generate all resonances up to masses of about 2 GeV, with twelve input parameters, namely f_pi, three masses, and eight low energy constants (LECs) of chiral perturbation theory. In linear response theory, we find that matter takes an extremely long time to thermalize. These long relaxation times are directly related to the fact that these mesons are pseudo-Goldstone bosons of chiral symmetry breaking. This result indicates that fireballs created with zero baryon number in heavy-ion collisions will drop out of chemical equilibrium once they enter the chiral symmetry broken phase.
Held, Heinz Joachim, Den Reichen wird das Evangelium gepredigt
Creators: name: Schroer, Jürgen
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 48 Nr. 1 (1999): Ökumenische Rundschau, Band 48, Heft 1
Code for the corrected analysis of PLoS ONE paper by Mietus-Snyder et al._2021-03-02
Creators: name: YJN
Publisher: name: Zenodo
Year: 2021

description: This file provides the code for the corrected analysis of the PLoS ONE paper by Mietus-Snyder et al. (2020). see: https://doi.org/10.1371/journal.pone.0240437. Associated dataset can be accessed from: https://doi.org/10.1371/journal.pone.0240437.s004
title: Text/Conference Paper
Creators: name: Froitzheim, Manuel
name: Schuhen, Michael
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2019
Subjects: subject: Elektronisches Schulbuch
subject: Kollaborativität
subject: Interaktivität
subject: ECON EBook

description: In diesem Posterbeitrag wird die Integration von domänenspezifischen Methoden zum kollaborativen Lernen mit mobilen Endgeräten in einem elektronischen Schulbuch dargestellt. Am Beispiel des wirtschaftswissenschaftlichen Unterrichtsinhalts „Nutzen und Grenznuten“ wird die Umsetzung in einer Lerneinheit für den Wirtschaftsunterricht am Ender der Sekundarstufe vorgestellt.
title: Text/Conference Paper
Creators: name: Leonhardt, Thiemo
name: Ehlenz, Matthias
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2019
Subjects: subject: Tangibles
subject: kollaborative Lernanwendung
subject: Tabletop

description: In diesem Beitrag werden zwei kollaborative Lernanwendungen unter Einbindung von Tangibles auf großen Multitouch-Displays im Bereich Informatik vorgestellt. Das erste Spiel behandelt Pattern Matching mit regulären Ausdrücken. Die Tangibles werden hierbei als Eingabegeräte genutzt und bieten zudem individuelle Feedbackmöglichkeiten. Das zweite Spiel behandelt das Erstellen und Simulieren logischer Schaltungen aus der praktischen Informatikausbildung. Hier ist besonders die Möglichkeit des kollaborativen Simulierens von Schaltungen über die Tangibles als logische Gatter ein wesentlicher Mehrwert.
title: Text/Conference Paper
Creators: name: Garmann, Robert
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2019
Subjects: subject: Automatisierte Bewertung
subject: Programmieraufgaben
subject: Grader
subject: Autobewerter
subject: E-Assessment
subject: Bewertungsschema
subject: ProFormA
subject: Softwaretest

description: Automatisiert bewertbare Programmieraufgaben definieren Tests, die auf Einreichungen angewendet werden. Da Testergebnisse nicht mit Bewertungsergebnissen gleichzusetzen sind, schlagen wir ein Beschreibungsformat vor, das Testergebnisse auf Bewertungsergebnisse abbildet. Lehrkräfte können die Abbildungsvorschrift an ihren Lehrkontext anpassen. Der Vorschlag ist unabhängig von den beteiligten Autobewertern, von den eingesetzten Benutzungsschnittstellen und von der zu lernenden Programmiersprache einsetzbar. Das Format basiert auf verschachtelten Bewertungskategorien, welche um ein Nullifikationen-Konzept ergänzt werden.
Fluctuations driven isotropization of the quark-gluon plasma in heavy ion collisions
Creators: name: Akkelin, S. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Averaged over ensemble of initial conditions kinetic transport equations of weakly coupled systems of quarks and gluons are derived. These equations account for the correlators of fluctuations of particles and classical gluon fields. The isotropization of particle momenta by field fluctuations at the early prethermal stage of matter evolution in ultrarelativistic heavy ion collisions is discussed. Our results can be useful for understanding under what conditions isotropization of the quark-gluon plasma in ultrarelativistic heavy ion collisions can be reached within phenomenologically observed time scales.
description: 16 pages, misprints corrected, to be published in Phys. Rev. C
Molecular origin of the reduced phase stability and faster formation/dissociation kinetics in confined methane hydrate
Creators: name: Jin, Dongliang
name: Coasne, Benoit
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The microscopic mechanisms involved in the formation/dissociation of methane hydrate confined at the nanometer scale are unraveled using advanced molecular modeling techniques combined with a mesoscale thermodynamic approach. By means of atom-scale simulations probing coexistence upon confinement and free energy calculations, phase stability of confined methane hydrate is shown to be restricted to a narrower temperature and pressure domain than its bulk counterpart. The melting point depression at a given pressure, which is consistent with available experimental data, is shown to be quantitatively described using the Gibbs--Thomson formalism if used with accurate estimates for the pore/liquid and pore/hydrate surface tensions. The metastability barrier upon hydrate formation and dissociation is found to decrease upon confinement, therefore providing a molecular scale picture for the faster kinetics observed in experiments on confined gas hydrates. By considering different formation mechanisms -- bulk homogeneous nucleation, external surface nucleation, and confined nucleation within the porosity -- we identify a crossover in the nucleation process; the critical nucleus formed in the pore corresponds either to a hemispherical cap or a bridge nucleus depending on temperature, contact angle, and pore size. Using the classical nucleation theory, for both mechanisms, the typical induction time is shown to scale with the pore surface to volume ratio and, hence, the reciprocal pore size. These findings for the critical nucleus and nucleation rate associated to such complex transitions provide a mean to rationalize and predict methane hydrate formation in any porous media from simple thermodynamic data.
Henze, Dagmar / Janssen, Claudia / Müller, Stefanie / Wehn, Beate, Antijudaismus im Neuen Testament?
Creators: name: Dörrfuß, Ernst Michael
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 48 Nr. 1 (1999): Ökumenische Rundschau, Band 48, Heft 1
Tunnelling spectroscopy of the interface between Sr2RuO4 and a single Ru micro-inclusion in eutectic crystals
Creators: name: Yaguchi, Hiroshi
name: Takizawa, Keiichi
name: Kawamura, Minoru
name: Kikugawa, Naoki
name: Maeno, Yoshiteru
name: Meno, Takayoshi
name: Akazaki, Tatsushi
name: Semba, Kouichi
name: Takayanagi, Hideaki
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The understanding of the zero bias conductance peak (ZBCP) in the tunnelling spectra of S/N junctions involving d-wave cuprate superconductors has been important in the determination of the phase structure of the superconducting order parameter. In this context, the involvement of a p-wave superconductor such as Sr2RuO4 in tunnelling studies is indeed of great importance. We have recently succeeded in fabricating devices that enable S/N junctions forming at interfaces between Sr2RuO4 and Ru micro-inclusions in eutectic crystals to be investigated.3 We have observed a ZBCP and have interpreted it as due to the Andreev bound state, commonly seen in unconventional superconductors. Also we have proposed that the onset of the ZBCP may be used to delineate the phase boundary for the onset of a time reversal symmetry broken (TRSB) state within the superconducting state, which does not always coincide with the onset of the superconducting state. However, these measurements always involved two interfaces between Sr2RuO4 and Ru. In the present study, we have extended the previous measurements to obtain a deeper insight into the properties of a single interface between Sr2RuO4 and Ru.
description: To appear in J. Phys. Soc. Jpn. Vol. 75 No.12 issue
REEEM-D5.3_Focus Report on Life Cycle Assessment and Demand for Critical Materials
Creators: name: REEEM Project
Publisher: name: Zenodo
Year: 2019

description: This report describes the execution, results, and insights from Task 5.3 of the REEEM project, which analyses pathways towards a low‐carbon energy system for the European Union. Part I of this document describes the LCA model developed as part of the Task and its application to the pathways to quantify the associated environmental impacts. Part II focuses on the critical materials assessment component of the Task and discusses how European energy technology related demand for these materials might change between the pathways explored in REEEM and assesses the risk of supply bottlenecks that might impede these technological transitions.
Light-Curve Evolution due to Secular Dynamics and the Vanishing Transits of KOI 120.01
Creators: name: Judkovsky, Yair
name: Ofir, Aviv
name: Aharonson, Oded
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Non-Keplerian dynamics of planetary orbits manifest in the transit light-curve as variations of different types. In addition to Transit Timing Variations (TTV's), the shape of the transits contains additional information on variations in the geometry of the orbit. This study presents an analytic approach to light-curve fitting: dynamical variations in the orbital elements are transformed to a light-curve using an analytic function with a restricted set of fitting parameters. Our method requires no N-body integration, resulting in a smaller number of degrees of freedom and a faster calculation. The approach described here is for the case of secular perturbations. By assuming that the orbital motion is dominated by nodal and apsidal precessions, analytic expressions for the light-curve transit parameters are derived as a function of the orbital variations. Detecting and characterizing such dynamical scenarios provides information regarding the possible existence of non-transiting companions, or the non-spherical mass distribution of the host star. The variations may imply forces out of the orbital plane, and thus probe mutual inclinations among components of the system. The derived models successfully reproduce the vanishing transit signals of KOI 120.01, and suggest a possible interesting scenario of a planet orbiting one member of a close-in binary system undergoing unusually rapid nodal regression. The model parameters are degenerate, so we provide relevant information for followup observations, which are suggested in order to place further constraints on this unique Kepler object.
description: 16 pages, 5 figures
Analytical view of diffusive and convective cosmic ray transport in elliptical galaxies
Creators: name: Hein, T.
name: Spanier, F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context: An analytical solution of the generalized diffusive and convective transport equation is derived to explain the transport of cosmic ray protons within elliptical galaxies. Aims: Cosmic ray transport within elliptical galaxies is an interesting element in understanding the origin of high energetic particles measured on Earth. As probable sources of those high energetic particles, elliptical galaxies show a dense interstellar medium as a consequence of activity in the galactic nucleus or merging events between galaxies. Thus it is necessary for an appropriate description of cosmic ray transport to take the diffusive and convective processes in a dense interstellar environment into account. Here we show that the transport equations can be solved analytically with respect to the given geometry and boundary conditions in position space, as well as in momentum space. Results: The spatial solution is shown using a generalized source of cosmic rays. Additionally, the special case of a jet-like source is illustrated. We present the solution in momentum space with respect to an escape term for cosmic ray protons depending on the spatial shape of the galaxy. For a delta-shape injection function, the momentum solution is obtained analytically. We find that the spectral index measured on Earth can be obtained by appropriately choosing of the strength of Fermi I and Fermi II processes. From these results we calculate the gamma-ray flux from pion decay due to proton-proton interaction to give connection to observations. Additionally we determine the escape-spectrum of cosmic rays. The results show that both spectra are harder than the intrinsic power-law spectrum for cosmic rays in elliptical galaxies.
description: 23 pages, 7 figures, accepted for publication in A&A
Computational Solutions for Today's Navy
Creators: name: Bentrem, Frank W.
name: Sample, John T.
name: Harris, Michael M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Multiagent Systems (cs.MA)
subject: General Literature (cs.GL)
subject: FOS: Computer and information sciences
subject: I.2.11; J.2

description: New methods are being employed to meet the Navy's changing software-development environment.
description: This is a work of the U.S. Government
Public policy and privatised justice : the setting aside of arbitral awards by national courts of the arbitral situs
Creators: name: Igbokwe, Virtus Chukwutoo
Publisher: name: University of British Columbia
Year: 2009

description: The loser in an international commercial arbitration can exercise either of two options if he is not satisfied with the outcome of the proceedings. He can apply to have the resulting award set aside by the appropriate national court of the place of arbitration or he can oppose the recognition and enforcement of the award in all the jurisdictions in which the winner seeks to enforce it. A successful setting aside application vacates and nullifies the award and renders it unenforceable in all jurisdictions. On the other hand, a successful resistance to recognition and enforcement of the award only affects the award in that particular jurisdiction and the award could be enforced in another jurisdiction where the loser has assets. Among other things, the division of these two functions between the national courts of the place of arbitration and that of the place of recognition and enforcement helps in securing one of the fundamental advantages of arbitration which is forum neutrality. However, comparatively recent national arbitration laws of Belgium, Switzerland and Tunisia on the setting aside of award have shifted the two functions to the national courts of the place of recognition and enforcement of the award. By using the comparative law methodology, this thesis argues that this legislative trend is unsatisfactory both in its reasoning and intended result. The legislations are not only a recipe for arbitrator misconduct and injustice but are also in violation of the obligations of these states under the 1958 New York Convention on the Recognition and Enforcement of Awards, the various regional treaties on the protection of human right as well as the international consensus articulated in the UNCITRAL Model Law.
Solar east-west flow correlations that persist for months at low latitudes are dominated by active region inflows
Creators: name: Hanson, Chris S.
name: Duvall, Thomas L.
name: Birch, Aaron C.
name: Gizon, Laurent
name: Sreenivasan, Katepalli R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context: Giant-cell convection is believed to be an important component of solar dynamics. For example, it is expected to play a crucial role in maintaining the Sun's differential rotation. Aims: We re-examine early reports of giant convective cells detected using correlation analysis of Dopplergrams. We extend this analysis using 19 years of space and ground-based observations of near-surface horizontal flows. Method: Flow maps are derived through local correlation tracking of granules and helioseismic ring-diagram analysis. We compute temporal auto-correlation functions of the east-west flows at fixed latitude. Results: Correlations in the east-west velocity can be clearly seen up to five rotation periods. The signal consists of features with longitudinal wavenumbers up to m=9 at low latitudes. Comparison with magnetic images indicates that these flow features are associated with magnetic activity. The signal is not seen above the noise level during solar minimum. Conclusions: Our results show that the long-term correlations in east-west flows at low latitudes are dominantly due to inflows into active regions and not to giant convective cells.
description: 9 pages, 10 figures, accepted into A&A
Is quantum mechanics based on an invariance principle?
Creators: name: Brenig, Leon
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Non-relativistic quantum mechanics for a free particle is shown to emerge from classical mechanics through an invariance principle under transformations that preserve the Heisenberg position-momentum inequality. These transformations are induced by isotropic space dilations. This invariance imposes a change in the laws of classical mechanics that exactly corresponds to the transition to quantum mechanics. The Schroedinger equation appears jointly with a second nonlinear equation describing non-unitary processes. Unitary and non-unitary evolutions are exclusive and appear sequentially in time. The non-unitary equation admits solutions that seem to correspond to the collapse of the wave function.
description: 15 pages