cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Solar wind turbulent spectrum at plasma kinetic scales
Creators: name: Alexandrova, Olga
name: Lacombe, Catherine
name: Mangeney, Andre
name: Grappin, Roland
name: Maksimovic, Milan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The description of the turbulent spectrum of magnetic fluctuations in the solar wind in the kinetic range of scales is not yet completely established. Here, we perform a statistical study of 100 spectra measured by the STAFF instrument on the Cluster mission, which allows to resolve turbulent fluctuations from ion scales down to a fraction of electron scales, i.e. from $\sim 10^2$ km to $\sim 300$ m. We show that for $k_{\perp}ρ_e \in[0.03,3]$ (that corresponds approximately to the frequency in the spacecraft frame $f\in [3,300]$ Hz), all the observed spectra can be described by a general law $E(k_\perp)\propto k_\perp^{-8/3}\exp{(-k_\perp ρ_e)}$, where $k_{\perp}$ is the wave-vector component normal to the background magnetic field and $ρ_e$ the electron Larmor radius. This exponential tail found in the solar wind seems compatible with the Landau damping of magnetic fluctuations onto electrons.
description: published in APJ, 15 of November 2012 (with reduced "Discussion" section)
D3.3 Data Fusion Methods and Digital Twin-based IoT Data Processing Pipelines
Creators: name: Imperiale, Manuel
Publisher: name: Zenodo
Year: 2022
Subjects: Digital Twin
Internet of Things
IoT Protocols
Data fusion

description: This deliverable describes the development of communication protocols and security procedures for IoT data processing and secure real-time data stream pipelines from physical data sources (devices, sensors, and actuators). This deliverable also covers the development of data fusion algorithms necessary for collecting, processing combining and fusion of data and information from multiple sources and services.
Symplectic spinor valued forms and invariant operators acting between them
Creators: name: Krýsl, Svatopluk
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: Representation Theory (math.RT)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 53C27, 53D05, 58J60

description: Exterior differential forms with values in the (Kostant's) symplectic spinor bundle on a manifold with a given metaplectic structure are decomposed into invariant subspaces. Projections to these invariant subspaces of a covariant derivative associated to a torsion-free symplectic connection are described.
description: 12 pages, 1 figure
title: Ausgrabungen und Zerstörungen an den Megalithen von Carnac während der deutschen Besatzung der Bretagne (1940 -1944)
Creators: name: Perschke, Reena
Publisher: name: University Library Heidelberg
Year: 2015

description: Während des Dritten Reiches galten die Megalithen der Bretagne als Prestigeprojekt unter deutschen Vorgeschichtlern. Durch Kulturvergleiche, Vermessungen und Ausgrabungen sollte nachgewiesen werden, dass die westeuropäischen Monumente jünger seien als die nordeuropäischen Megalithanlagen. Daher sei die Megalithkultur der Bretagne als jungsteinzeitlicher Kulturtransfer aus dem „nordischen Kreis“ zu betrachten und eng mit der Herausbildung des „Germanentums“ verknüpft. Unter anderem sollte die archäologische Interpretation eine Rechtfertigung für die nationalsozialistische Eroberung Westeuropas als „urgermanischem“ Siedlungsgebiet liefern. Für das Projekt Carnac interessierten sich parallel mehrere archäologische Institutionen, aber nur der Einsatzstab Reichsleiter Rosenberg (ERR), eine Einrichtung der NSDAP, konnte entsprechende Arbeiten in der Bretagne erfolgreich durchführen. Während die deutschen Archäologen einige Monumente für ihre ideologischen Zwecke missbrauchten, wurden andere Megalithgräber und Menhire zeitgleich durch die Konstruktion des Atlantikwalls schwer beschädigt. Trotz der Einrichtung eines militärischen Kunstschutzes erlaubte der straffe Arbeitsplan der Organisation Todt keine Rücksichtnahme auf die prähistorischen Fundorte. Mehrere Megalithgräber wurden durch den Bau von Schützengräben und Bunkern vollständig zerstört, andere Fundorte konnten gerettet oder nach Kriegsende restauriert werden.
description: The megaliths of Brittany were a very prestigious project for German archaeologists during the Third Reich. They arranged measurements, excavations and cultural comparisons to prove that the monuments of Western Europe were younger than the northern European megaliths. For national-socialist archaeologists, the western megaliths had to be depending on the culture development of Northern Europe and therefore proving the cultural predominance of the so-called Stone Age “Proto-Germans”. This archaeological interpretation was also meant to justify the Battle of France by the NS-Regime. Several archaeological institutions were interested in the project at Carnac, but only the Einsatzstab Reichsleiter Rosenberg, an archaeological division within the NSDAP, could accomplish excavations and measurements in the famous alignments. While the megaliths were used to promote political purposes by German archaeologists, many of these monuments suffered severe damage caused by the construction of the Atlantic Wall. The timetable for the construction as devised by the construction leading “Organisation Todt” led no space for respecting prehistoric sites. Some megalithic monuments were destroyed in order to construct bunkers and trenches, other sites were saved or could be restored after the Second World War.
The role of the Rashba coupling in spin current of monolayer gapped graphene
Creators: name: Hasanirokh, K.
name: Azizi, J.
name: Phirouznia, A.
name: Mohammadpour, H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In the current work we have investigated the influence of the Rashba spin-orbit coupling on spin-current of a single layer gapped graphene. It was shown that the Rashba coupling has a considerable role in generation of the spin-current of vertical spins in mono-layer graphene. The behavior of the spin-current is determined by density of impurities. It was also shown that the spin-current of the system could increase by increasing the Rashba coupling strength and band-gap of the graphene and the sign of the spin-current could be controlled by the direction of the current-driving electric field.
title: Karl, R., Burin, B., Frana, Z., Gufler, V., Hörhan, J., Medek, A., Rechberger, T., Rokita, K., Trausmuth, T., Unterweger, S., Vonkilch, A. & Wallner, M. (2014). Archäologische Interessen der österreichischen Bevölkerung. Bericht und Analyse einer Umfrage
Creators: name: Siegmund, Frank
Publisher: name: University Library Heidelberg
Year: 2015

description: Rezension zu: Karl, R., Burin, B., Frana, Z., Gufler, V., Hörhan, J., Medek, A., Rechberger, T., Rokita, K., Trausmuth, T., Unterweger, S., Vonkilch, A. & Wallner, M. (2014). Archäologische Interessen der österreichischen Bevölkerung. Bericht und Analyse einer Umfrage, November 2013-Jänner 2014. Bangor Studies in Archaeology Report No. 8. Bangor: Bangor University School of History, Welsh History and Archaeology. 76 Seiten. Monografie im Open Access, erreichbar z. B. unter: http://bangor. academia.edu/RaimundKarl [7.9.2014]
Doppler imaging of stellar surface structure - XXIV. The lithium-rich single K-giants DP Canum Venaticorum and DI Piscium
Creators: name: Kovari, Zs.
name: Korhonen, H.
name: Strassmeier, K. G.
name: Weber, M.
name: Kriskovics, L.
name: Savanov, I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present the first Doppler imaging study of the two rapidly rotating, single K-giants DP CVn and DI Psc in order to study the surface spot configuration and to pinpoint their stellar evolutionary status. Optical spectroscopy and photometry are used to determine the fundamental astrophysical properties. Doppler imaging is applied to recover the surface temperature distribution for both stars, while photometric light-curve inversions are carried out for studying the long-term changes of the surface activity of DP CVn. Surface differential rotation of DP CVn is estimated from cross-correlating the available subsequent Doppler reconstructions separated by roughly one rotation period. Both stars appear to have higher than normal lithium abundance, LTE log n of 2.28 (DP CVn) and 2.20 (DI Psc), and are supposed to be located at the end of the first Li dredge-up on the RGB. Photometric observations reveal rotational modulation with a period of 14.010 d (DP CVn) and 18.066 d (DI Psc). Doppler reconstructions from the available mapping lines well agree in the revealed spot patterns, recovering rather low latitude spots for both stars with temperature contrasts of Delta T ~ 600-800 K below the unspotted photospheric background. Spots at higher latitudes are also found but either with less contrast (DP CVn) or with smaller extent (DI Psc). A preliminary antisolar-type differential rotation with alpha=-0.035 is found for DP CVn from cross-correlating the subsequent Doppler images. Long-term photometric analysis supports the existence of active longitudes, as well as the differential rotation.
description: accepted for publication in A&A
Reconstruction of Tip-Surface Interactions with Multimodal Intermodulation Atomic Force Microscopy
Creators: name: Borysov, Stanislav S.
name: Platz, Daniel
name: de Wijn, Astrid S.
name: Forchheimer, Daniel
name: Tolen, Eric A.
name: Balatsky, Alexander V.
name: Haviland, David B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose a theoretical framework for reconstructing tip-surface interactions using the intermodulation technique when more than one eigenmode is required to describe the cantilever motion. Two particular cases of bimodal motion are studied numerically: one bending and one torsional mode, and two bending modes. We demonstrate the possibility of accurate reconstruction of a two-dimensional conservative force field for the former case, while dissipative forces are studied for the latter.
description: 11 pages, 10 figures
Deep-sequencing of the Peach Latent Mosaic Viroid Reveals New Aspects of Population Heterogeneity
Creators: name: Glouzon, Jean-Pierre Sehi
name: Bolduc, François
name: Najmanovich, Rafael
name: Wang, Shengrui
name: Perreault, Jean-Pierre
Publisher: name: arXiv
Year: 2012
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Biomolecules (q-bio.BM)
subject: Genomics (q-bio.GN)
subject: FOS: Biological sciences

description: Viroids are small circular single-stranded infectious RNAs that are characterized by a relatively high mutation level. Knowledge of their sequence heterogeneity remains largely elusive, and, as yet, no strategy attempting to address this question from a population dynamics point of view is in place. In order to address these important questions, a GF305 indicator peach tree was infected with a single variant of the Avsunviroidae family member Peach latent mosaic viroid (PLMVd). Six months post-inoculation, full-length circular conformers of PLMVd were isolated, deep-sequenced and the resulting sequences analyzed using an original bioinformatics scheme specifically designed and developed in order to evaluate the richness of a given the sequence's population. Two distinct libraries were analyzed, and yielded 1125 and 1061 different PLMVd variants respectively, making this study the most productive to date (by more than an order of magnitude) in terms of the reporting of novel viroid sequences. Sequence variants exhibiting up to ~20% of mutations relative to the inoculated viroid were retrieved, clearly illustrating the high divergence dynamic inside a unique population. Using a novel hierarchical clustering algorithm, the different variants obtained were grouped into either 7 or 8 clusters depending on the library being analyzed. Most of the sequences contained, on average, between 4.6 and 6.3 mutations relative to the variant used initially to inoculate the plant. Interestingly, it was possible to reconstitute the sequence evolution between these clusters. On top of providing a reliable pipeline for the treatment of viroid deep-sequencing, this study sheds new light on the importance of the sequence variation that may take place in a viroid population and which may result in the formation of a quasi-species.
description: Manuscript submitted to PLoS ONE October 3rd, 2012. Supplementary data can be found at: http://dx.doi.org/10.6084/m9.figshare.100858
title: August Jegher, 1843-1924, Ingenieur
title: Herausgeber der Schweizerischer Bauzeitung, Ehrenmitglied der G.E.P. und des S.I.A.
titleType: Subtitle
title: 7. Sept. 1843 - 13. Feb. 1924
titleType: Subtitle
Creators: name: Jegher, Carl
name: Blum, Emil
Publisher: name: Jean Frey
Year: 1924
Subjects: subject: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
subject: 920 Biografien, Genealogie, Insignien
subject: Nachruf
subject: Jegher, August
subject: Triest
subject: Zürich

description: Sonderdruck aus: Schweizerische Bauzeitung, Band 83, Nr. 8 und 9, Februar 1924
Ground states of an Ising model on an extended Shastry-Sutherland lattice and the 1/2-magnetization plateau in some rare-earth-metal tetraborides
Creators: name: Dublenych, Yu. I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A complete solution of the ground-state problem for an Ising model on the Shastry-Sutherland lattice with an additional interaction along the diagonals of "empty" squares in an applied magnetic field is presented. A rigorous proof is given that this interaction gives rise to a plateau at one-half of the saturation magnetization. Such a fractional plateau has been observed in some rare-earth-metal tetraborides, in particular, in strong Ising magnets ErB4 (where it is the only one) and TmB4 (where it is the broadest one), but its origin has remained unclear. Our study sheds new light on the solution of this problem.
description: 15 pages, 20 figures, submitted to Physical Review B
Advanced quantum methods for the largest magnetic molecules
Creators: name: Schnack, J.
name: Ummethum, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss modern numerical methods for quantum spin systems and their application to magnetic molecules.
description: 17 pages, 7 figures
A Vast Thin Plane of Co-rotating Dwarf Galaxies Orbiting the Andromeda Galaxy
Creators: name: Ibata, Rodrigo A.
name: Lewis, Geraint F.
name: Conn, Anthony R.
name: Irwin, Michael J.
name: McConnachie, Alan W.
name: Chapman, Scott C.
name: Collins, Michelle L.
name: Fardal, Mark
name: Ferguson, Annette M. N.
name: Ibata, Neil G.
name: Mackey, A. Dougal
name: Martin, Nicolas F.
name: Navarro, Julio
name: Rich, R. Michael
name: Valls-Gabaud, David
name: Widrow, Lawrence M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Dwarf satellite galaxies are thought to be the remnants of the population of primordial structures that coalesced to form giant galaxies like the Milky Way. An early analysis noted that dwarf galaxies may not be isotropically distributed around our Galaxy, as several are correlated with streams of HI emission, and possibly form co-planar groups. These suspicions are supported by recent analyses, and it has been claimed that the apparently planar distribution of satellites is not predicted within standard cosmology, and cannot simply represent a memory of past coherent accretion. However, other studies dispute this conclusion. Here we report the existence (99.998% significance) of a planar sub-group of satellites in the Andromeda galaxy, comprising approximately 50% of the population. The structure is vast: at least 400 kpc in diameter, but also extremely thin, with a perpendicular scatter <14.1 kpc (99% confidence). Radial velocity measurements reveal that the satellites in this structure have the same sense of rotation about their host. This finding shows conclusively that substantial numbers of dwarf satellite galaxies share the same dynamical orbital properties and direction of angular momentum, a new insight for our understanding of the origin of these most dark matter dominated of galaxies. Intriguingly, the plane we identify is approximately aligned with the pole of the Milky Way's disk and is co-planar with the Milky Way to Andromeda position vector. The existence of such extensive coherent kinematic structures within the halos of massive galaxies is a fact that must be explained within the framework of galaxy formation and cosmology.
description: Published in the 3rd Jan 2013 issue of Nature. 19 pages, 4 figures, 1 three-dimensional interactive figure. To view and manipulate the 3-D figure, an Adobe Reader browser plug-in is required; alternatively save to disk and view with Adobe Reader
Analytic and Algorithmic Aspects of Generalized Harmonic Sums and Polylogarithms
Creators: name: Ablinger, Jakob
name: Blümlein, Johannes
name: Schneider, Carsten
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Symbolic Computation (cs.SC)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In recent three--loop calculations of massive Feynman integrals within Quantum Chromodynamics (QCD) and, e.g., in recent combinatorial problems the so-called generalized harmonic sums (in short $S$-sums) arise. They are characterized by rational (or real) numerator weights also different from $\pm 1$. In this article we explore the algorithmic and analytic properties of these sums systematically. We work out the Mellin and inverse Mellin transform which connects the sums under consideration with the associated Poincaré iterated integrals, also called generalized harmonic polylogarithms. In this regard, we obtain explicit analytic continuations by means of asymptotic expansions of the $S$-sums which started to occur frequently in current QCD calculations. In addition, we derive algebraic and structural relations, like differentiation w.r.t. the external summation index and different multi-argument relations, for the compactification of $S$-sum expressions. Finally, we calculate algebraic relations for infinite $S$-sums, or equivalently for generalized harmonic polylogarithms evaluated at special values. The corresponding algorithms and relations are encoded in the computer algebra package {\tt HarmonicSums}.
description: 75 pages, 1 figure
title: Das Meer als Buch oder „Medusa. Die weiße Qualle“ von Tina Flau
Creators: name: Pommeranz, Johannes
Publisher: name: University Library Heidelberg
Year: 2015

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 41 (2014): KulturGut : aus der Forschung des Germanischen Nationalmuseums, Beginn und Erscheinungsfrequenz: Jahr: 2004
Open and FAIR transformation product data for improved suspect/non-target screening: REFTPs in the NORMAN-SLE, PubChem and patRoon
Creators: name: Chirsir, Parviel
name: Helmus, Rick
name: Bolton, Evan E
name: Thiessen, Paul A
name: Zhang, Jian
name: Schymanski, Emma L
Publisher: name: Zenodo
Year: 2023
Subjects: FAIR
Open
transformation products
non-target screening

description: Presentation given at ICCE, Venice, 11 - 15 June 2023.
title: Studien zu mittelneolithischen Kreisgrabenanlagen. Gerhard Traka, Verlag der Österreichischen Akademie der Wissenschaften. Wien 1991
Creators: name: Schyle, Daniel
Publisher: name: University Library Heidelberg
Year: 2015

description: Rezension zu: Studien zu mittelneolithischen Kreisgrabenanlagen. Gerhard Traka, Verlag der Österreichischen Akademie der Wissenschaften. Wien 1991. 340 Seiten, 125 SW-Abbildungen, 61 Tafeln, zahlreiche Tabellen. Quart, broschiert. ISBN 370011866X.
Counter effects of meridional flows and magnetic fields in stationary axisymmetric self-gravitating barotropes under the ideal MHD approximation: clear examples - toroidal configurations
Creators: name: Fujisawa, Kotaro
name: Takahashi, Rohta
name: Yoshida, Shijun
name: Eriguchi, Yoshiharu
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We obtain the general forms for the current density and the vorticity from the integrability conditions of the basic equations which govern the stationary states of axisymmetric magnetized self-gravitating barotropic objects with meridional flows under the ideal magnetohydrodynamics (MHD) approximation. As seen from the stationary condition equations for such bodies, the presence of the meridional flows and that of the poloidal magnetic fields act oppositely on the internal structures. The different actions of these two physical quantities, the meridional flows and the poloidal magnetic fields, could be clearly seen through stationary structures of the toroidal gaseous configurations around central point masses in the framework of Newtonian gravity because the effects of the two physical quantities can be seen in an amplified way for toroidal systems compared to those for spheroidal stars. The meridional flows make the structures more compact, i.e. the widths of toroids thinner, while the poloidal magnetic fields are apt to elongate the density contours in a certain direction depending on the situation. Therefore, the simultaneous presence of the internal flows and the magnetic fields would work as if there were no such different actions within and around the stationary gaseous objects such as axisymmetric magnetized toroids with internal motions around central compact objects under the ideal MHD approximation, although these two quantities might exist in real systems.
description: 17 pages, 9 figures; published online in MNRAS
Domain-of-Attraction Estimation for Uncertain Non-polynomial Systems
Creators: name: Wu, Min
name: Yang, Zhengfeng
name: Lin, Wang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Symbolic Computation (cs.SC)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: In this paper, we consider the problem of computing estimates of the domain-of-attraction for non-polynomial systems. A polynomial approximation technique, based on multivariate polynomial interpolation and error analysis for remaining functions, is applied to compute an uncertain polynomial system, whose set of trajectories contains that of the original non-polynomial system. Experiments on the benchmark non-polynomial systems show that our approach gives better estimates of the domain-of-attraction.
Coexistence of oppositely flowing multi-$φ$-currents: Key to large toroidal magnetic fields within stars
Creators: name: Fujisawa, Kotaro
name: Eriguchi, Yoshiharu
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We will show the importance of coexistence of oppositely flowing $φ$-currents for magnetized stars to sustain strong toroidal magnetic fields within the stars by an- alyzing stationary states of magnetized stars with surface currents which flow in the opposite direction with respect to the bulk currents within the stars. We have imposed boundary conditions for currents and toroidal magnetic fields to vanish outside the stars. It is important to note that these boundary conditions set an upper limit for the total current within the stars. This upper limit for the total current results in the presence of an upper limit for the magnitude of the energy for the toroidal magnetic fields of the stars. If the stars could have the toroidal surface currents which flow in the opposite directions to the internal toroidal currents, the positively flowing inter- nal toroidal currents can become stronger than the upper limit value of the current for configurations without surface toroidal currents. Thus the energies for the toroidal magnetic fields can become much larger than those for the magnetized stars with- out surface toroidal currents. We have also analyzed the same phenomena appearing in spherical incompressible stars for dipole-like magnetic fields with or without sur- face toroidal currents by employing the zero-flux-boundary method. We have applied those configurations with surface toroidal currents to magnetars and discussed their flares through which magnetic helicities could arise outside the stellar surfaces.
description: 21 pages, 13 figures; accepted for publication in MNRAS
Geodesic Motion in the (Charged) Doubly Spinning Black Ring Spacetime
Creators: name: Grunau, Saskia
name: Kagramanova, Valeria
name: Kunz, Jutta
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this article we analyze the geodesics of test particles and light in the five dimensional (charged) doubly spinning black ring spacetime. Apparently it is not possible to separate the Hamilton-Jacobi-equation for (charged) doubly spinning black rings in general, so we concentrate on special cases: null geodesics in the ergosphere and geodesics on the two rotational axes of the (charged) doubly spinning black ring. We present analytical solutions to the geodesic equations for these special cases. Using effective potential techniques we study the motion of test particles and light and discuss the corresponding orbits.
description: arXiv admin note: substantial text overlap with arXiv:1208.2548
Formal conserved quantities for isothermic surfaces
Creators: name: Burstall, F. E.
name: Santos, S. D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53A30, 53A05

description: Isothermic surfaces in $S^n$ are characterised by the existence of a pencil $\nabla^t$ of flat connections. Such a surface is special of type $d$ if there is a family $p(t)$ of $\nabla^t$-parallel sections whose dependence on the spectral parameter $t$ is polynomial of degree $d$. We prove that any isothermic surface admits a family of $\nabla^t$-parallel sections which is a formal Laurent series in $t$. As an application, we give conformally invariant conditions for an isothermic surface in $S^3$ to be special.
description: 13 pages
title: Ausstellung
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2015

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 44, Nr. 1 (2015), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
*-Regular Leavitt path algebras of arbitrary graphs
Creators: name: Pino, Gonzalo Aranda
name: Rangaswamy, Kulumani. M.
name: Vas, Lia
Publisher: name: arXiv
Year: 2013
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16D70, 16W10, 16S99

description: If $K$ is a field with involution and $E$ an arbitrary graph, the involution from $K$ naturally induces an involution of the Leavitt path algebra $L_K(E).$ We show that the involution on $L_K(E)$ is proper if the involution on $K$ is positive definite, even in the case when the graph $E$ is not necessarily finite or row-finite. It has been shown that the Leavitt path algebra $L_K(E)$ is regular if and only if $E$ is acyclic. We give necessary and sufficient conditions for $L_{K}(E)$ to be $^\ast$-regular (i.e. regular with proper involution). This characterization of $^\ast$-regularity of a Leavitt path algebra is given in terms of an algebraic property of $K,$ not just a graph-theoretic property of $E.$ This differs from the known characterizations of various other algebraic properties of a Leavitt path algebra in terms of graph-theoretic properties of $E$ alone. As a corollary, we show that Handelman's conjecture (stating that every $^\ast$-regular ring is unit-regular) holds for Leavitt path algebras. Moreover, its generalized version for rings with local units also continues to hold for Leavitt path algebras over arbitrary graphs.
Biophysics software for interdisciplinary education and research
Creators: name: Deutsch, J. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: Biophysics is a subject that is spread over many disciplines and transcends the skills and knowledge of the individual student. This makes it challenging both to teach and to learn. Educational materials are described to aid in teaching undergraduates biophysics in an interdisciplinary manner. Projects have been devised on topics that range from x-ray diffraction to the Hodgkin Huxley equations. They are team-based and encourage collaboration. The projects make extensive use of software written in Python/Scipy which can be modified to explore a large range of possible phenomena. The software can also be used in lectures and in the teaching of more traditional biophysics courses.
description: 22 pages, 13 figures
Graphene-based charge sensors
Creators: name: Neumann, C.
name: Volk, C.
name: Engels, S.
name: Stampfer, C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We discuss graphene nanoribbon-based charge sensors and focus on their functionality in the presence of external magnetic fields and high frequency pulses applied to a nearby gate electrode. The charge detectors work well with in-plane magnetic fields of up to 7 T and pulse frequencies of up to 20 MHz. By analyzing the step height in the charge detector's current at individual charging events in a nearby quantum dot, we determine the ideal operation conditions with respect to the applied charge detector bias. Average charge sensitivities of 1.3*10^-3 e/sqrt{Hz} can be achieved. Additionally, we investigate the back action of the charge detector current on the quantum transport through a nearby quantum dot. By setting the charge detector bias from 0 to 4.5 mV, we can increase the Coulomb peak currents measured at the quantum dot by a factor of around 400. Furthermore, we can completely lift the Coulomb blockade in the quantum dot.
description: 7 pages, 7 figures
2.1-watts intracavity-frequency-doubled all-solid-state light source at 671 nm for laser cooling of lithium
Creators: name: Eismann, Ulrich
name: Andrea, Bergschneider
name: Salomon, Christophe
name: Chevy, Frédéric
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present an all-solid-state laser source emitting up to 2.1 W of single-frequency light at 671 nm developed for laser cooling of lithium atoms. It is based on a diode-pumped, neodymium-doped orthovanadate (Nd:YVO$_4$) ring laser operating at 1342 nm. Optimization of the thermal management in the gain medium results in a maximum multi-frequency output power of 2.5 W at the fundamental wavelength. We develop a simple theory for the efficient implementation of intracavity second harmonic generation, and its application to our system allows us to obtain nonlinear conversion efficiencies of up to 88%. Single-mode operation and tuning is established by adding an etalon to the resonator. The second-harmonic wavelength can be tuned over 0.5 nm, and mode-hop-free scanning over more than 6 GHz is demonstrated, corresponding to around ten times the laser cavity free spectral range. The output frequency can be locked with respect to the lithium $D$-line transitions for atomic physics applications. Furthermore, we observe parametric Kerr-lens mode-locking when detuning the phase-matching temperature sufficiently far from the optimum value.
Relation of exact Gaussian basis methods to the dephasing representation: Theory and application to time-resolved electronic spectra
Creators: name: Šulc, Miroslav
name: Hernández, Henar
name: Martínez, Todd J.
name: Vaníček, Jiří
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We recently showed that the Dephasing Representation (DR) provides an efficient tool for computing ultrafast electronic spectra and that further acceleration is possible with cellularization [M. Šulc and J. Vaníček, Mol. Phys. 110, 945 (2012)]. Here we focus on increasing the accuracy of this approximation by first implementing an exact Gaussian basis method, which benefits from the accuracy of quantum dynamics and efficiency of classical dynamics. Starting from this exact method, the DR is derived together with ten other methods for computing time-resolved spectra with intermediate accuracy and efficiency. These methods include the Gaussian DR, an exact generalization of the DR, in which trajectories are replaced by communicating frozen Gaussian basis functions evolving classically with an average Hamiltonian. The newly obtained methods are tested numerically on time correlation functions and time-resolved stimulated emission spectra in the harmonic potential, pyrazine S0/S1 model, and quartic oscillator. Numerical results confirm that both the Gaussian basis method and the Gaussian DR increase the accuracy of the DR. Surprisingly, in chaotic systems the Gaussian DR can outperform the presumably more accurate Gaussian basis method, in which the two bases are evolved separately.
description: 15 pages, 7 figures
Strongly semihereditary rings and rings with dimension
Creators: name: Vas, Lia
Publisher: name: arXiv
Year: 2013
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16W99, 16S99, 16S90, 16W10

description: The existence of a well-behaved dimension of a finite von Neumann algebra (see [19]) has lead to the study of such a dimension of finite Baer *-rings (see [26]) that satisfy certain *-ring axioms (used in [9]). This dimension is closely related to the equivalence relation $\sim^{*}$ on projections defined by $p\sim^{*} q$ iff $p=xx^*$ and $q=x^*x$ for some $x.$ However, the equivalence $\sim^{a}$ on projections (or, in general, idempotents) defined by $p\sim^{a} q$ iff $p=xy$ and $q=yx$ for some $x$ and $y,$ can also be relevant. There were attempts to unify the two approaches (see [10]). In this work, our agenda is three-fold: (1) We study assumptions on a ring with involution that guarantee the existence of a well-behaved dimension defined for any general equivalence relation on projections $\sim.$ (2) By interpreting $\sim$ as $\sim^{a},$ we prove the existence of a well-behaved dimension of strongly semihereditary rings with a positive definite involution. This class is wider than the class of finite Baer *-rings with dimension considered in the past: it includes some non Rickart *-rings. Moreover, none of the *-ring axioms from [9] and [26] are assumed. (3) As the first corollary of (2), we obtain dimension of noetherian Leavitt path algebras over positive definite fields. Secondly, we obtain dimension of a Baer *-ring $R$ satisfying the first seven axioms from [26] (in particular, dimension of finite $AW^*$-algebras). Assuming the eight axiom as well, $R$ has dimension for $\sim^{*}$ also and the two dimensions coincide.
title: Thomas Puttkammer (Hrsg.) (2012). Auf den Spuren der Germanen. Begleitband zur Wanderausstellung Auf den Spuren der Germanen: ein Gemeinschaftsprojekt des Museums der Westlausitz Kamenz mit dem Vlastivědnym Muzeem a Galerií v České Lípě (VMG) [...]
Creators: name: Herrmann, Eva
Publisher: name: University Library Heidelberg
Year: 2015

description: Rezension zu: Thomas Puttkammer (Hrsg.) (2012). Auf den Spuren der Germanen. Begleitband zur Wanderausstellung Auf den Spuren der Germanen: ein Gemeinschaftsprojekt des Museums der Westlausitz Kamenz mit dem Vlastivědnym Muzeem a Galerií v České Lípě (VMG) = Doprovodná publikace k putovní výstavě Po stopách Germánů. Hardcover, 183 S., 130 Abbildungen, deutsch und tschechisch. Kamenz: Museum der Westlausitz. ISBN 978-3-910018-60-0
PT-Symmetric Nonlinear Metamaterials and Zero-Dimensional Systems
Creators: name: Tsironis, G. P.
name: Lazarides, N.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A one dimensional, parity-time (${\cal PT}$)-symmetric magnetic metamaterial comprising split-ring resonators having both gain and loss is investigated. In the linear regime, the transition from the exact to the broken ${\cal PT}$-phase is determined through the calculation of the eigenfrequency spectrum for two different configurations; the one with equidistant split-rings and the other with the split-rings forming a binary pattern (${\cal PT}$ dimer chain). The latter system features a two-band, gapped spectrum with its shape determined by the gain/loss coefficient as well as the inter-element coupling. In the presense of nonlinearity, the ${\cal PT}$ dimer chain with balanced gain and loss supports nonlinear localized modes in the form of novel discrete breathers below the lower branch of the linear spectrum. These breathers, that can be excited from a weak applied magnetic field by frequency chirping, can be subsequently driven solely by the gain for very long times. The effect of a small imbalance between gain and loss is also considered. Fundamendal gain-driven breathers occupy both sites of a dimer, while their energy is almost equally partitioned between the two split-rings, the one with gain and the other with loss. We also introduce a model equation for the investigation of classical ${\cal PT}$ symmetry in zero dimensions, realized by a simple harmonic oscillator with matched time-dependent gain and loss that exhibits a transition from oscillatory to diverging motion. This behaviour is similar to a transition from the exact to the broken ${\cal PT}$ phase in higher-dimensional ${\cal PT}-$ symmetric systems. A stability condition relating the parameters of the problem is obtained in the case of piecewise constant gain/loss function that allows for the construction of a phase diagram with alternating stable and unstable regions.
description: 10 pages, 11 figs, subm. to Applied Physics A for the Proceedings of the META13 Conference
Modeling rotating stars in two dimensions
Creators: name: Rieutord, Michel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In this lecture I present the way stars can be modeled in two dimensions and especially the fluid flows that are driven by rotation. I discuss some of the various ways of taking into account turbulence and conclude this contribution by a short presentation of some of the first results obtained with the ESTER code on the modeling of interferometrically observed fast rotating early-type stars.
description: 16 pages, 2 fig. to appear in Proceedings of the Evry Schatzman School 2012 of PNPS and CNRS/INSU on the "Role and mechanisms of angular momentum transport during the formation and early evolution of stars", Eds. P.Hennebelle & C.Charbonnel
title: Inhalt / Aktuelle Ausstellungen / Impressum
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2015

description: KulturGut : aus der Forschung des Germanischen Nationalmuseums, Nr. 30 (2011): KulturGut : aus der Forschung des Germanischen Nationalmuseums, Beginn und Erscheinungsfrequenz: Jahr: 2004
Hot Subdwarf Formation: Confronting Theory with Observation
Creators: name: Geier, S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The formation of hot subdwarf stars is still unclear. Both single-star and binary scenarios have been proposed to explain the properties of these evolved stars situated at the extreme blue end of the horizontal branch. The observational evidence gathered in the last decade, which revealed high fractions of binaries, shifted the focus from the single-star to the binary formation scenarios. Common envelope ejection, stable Roche lobe overflow and the merger of helium white dwarfs seemed to be sufficient to explain the formation of both the binary as well as the remaining single hot subdwarfs. However, most recent and rather unexpected observations challenge the standard binary evolution scenarios.
description: 7 pages, to appear in "Ageing low-mass stars: from red giants to white dwarfs", LIAC40 proceedings
HATS-3b: An inflated hot Jupiter transiting an F-type star
Creators: name: Bayliss, D.
name: Zhou, G.
name: Penev, K.
name: Bakos, G.
name: Hartman, J.
name: Jordán, A.
name: Mancini, L.
name: Mohler, M.
name: Suc, V.
name: Rabus, M.
name: Béky, B.
name: Csubry, Z.
name: Buchhave, L.
name: Henning, T.
name: Nikolov, N.
name: Csák, B.
name: Brahm, R.
name: Espinoza, N.
name: Noyes, R.
name: Schmidt, B.
name: Conroy, P.
name: Wright, D.
name: Tinney, C.
name: Addison, B.
name: Sackett, P.
name: Sasselov, D.
name: Lázár, J.
name: Papp, I.
name: Sári, P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We report the discovery by the HATSouth survey of HATS-3b, a transiting extrasolar planet orbiting a V=12.4 F-dwarf star. HATS-3b has a period of P = 3.5479d, mass of Mp = 1.07MJ, and radius of Rp = 1.38RJ. Given the radius of the planet, the brightness of the host star, and the stellar rotational velocity (vsini = 9.0km/s), this system will make an interesting target for future observations to measure the Rossiter-McLaughlin effect and determine its spin-orbit alignment. We detail the low/medium-resolution reconnaissance spectroscopy that we are now using to deal with large numbers of transiting planet candidates produced by the HATSouth survey. We show that this important step in discovering planets produces logg and Teff parameters at a precision suitable for efficient candidate vetting, as well as efficiently identifying stellar mass eclipsing binaries with radial velocity semi-amplitudes as low as 1 km/s.
description: 11 pages, 10 figures, submitted to AJ
Comprehensive Detection of Genes Causing a Phenotype using Phenotype Sequencing and Pathway Analysis
Creators: name: Harper, Marc
name: Gronenberg, Luisa
name: Liao, James
name: Lee, Christopher
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Genomics (q-bio.GN)
subject: FOS: Biological sciences

description: Discovering all the genetic causes of a phenotype is an important goal in functional genomics. In this paper we combine an experimental design for multiple independent detections of the genetic causes of a phenotype, with a high-throughput sequencing analysis that maximizes sensitivity for comprehensively identifying them. Testing this approach on a set of 24 mutant strains generated for a metabolic phenotype with many known genetic causes, we show that this pathway-based phenotype sequencing analysis greatly improves sensitivity of detection compared with previous methods, and reveals a wide range of pathways that can cause this phenotype. We demonstrate our approach on a metabolic re-engineering phenotype, the PEP/OAA metabolic node in E. coli, which is crucial to a substantial number of metabolic pathways and under renewed interest for biofuel research. Out of 2157 mutations in these strains, pathway-phenoseq discriminated just five gene groups (12 genes) as statistically significant causes of the phenotype. Experimentally, these five gene groups, and the next two high-scoring pathway-phenoseq groups, either have a clear connection to the PEP metabolite level or offer an alternative path of producing oxaloacetate (OAA), and thus clearly explain the phenotype. These high-scoring gene groups also show strong evidence of positive selection pressure, compared with strictly neutral selection in the rest of the genome.
Fast Damage Recovery in Robotics with the T-Resilience Algorithm
Creators: name: Koos, Sylvain
name: Cully, Antoine
name: Mouret, Jean-Baptiste
Publisher: name: arXiv
Year: 2013
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Damage recovery is critical for autonomous robots that need to operate for a long time without assistance. Most current methods are complex and costly because they require anticipating each potential damage in order to have a contingency plan ready. As an alternative, we introduce the T-resilience algorithm, a new algorithm that allows robots to quickly and autonomously discover compensatory behaviors in unanticipated situations. This algorithm equips the robot with a self-model and discovers new behaviors by learning to avoid those that perform differently in the self-model and in reality. Our algorithm thus does not identify the damaged parts but it implicitly searches for efficient behaviors that do not use them. We evaluate the T-Resilience algorithm on a hexapod robot that needs to adapt to leg removal, broken legs and motor failures; we compare it to stochastic local search, policy gradient and the self-modeling algorithm proposed by Bongard et al. The behavior of the robot is assessed on-board thanks to a RGB-D sensor and a SLAM algorithm. Using only 25 tests on the robot and an overall running time of 20 minutes, T-Resilience consistently leads to substantially better results than the other approaches.