cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ökologische Beobachtungen an Gebirgspflanzen
Creators: name: Sauerbeck, Karl Otto
Publisher: name: Jahreshefte der Gesellschaft für Naturkunde in Württemberg
Year: 2008

description: Zwei seltsame Eisbildungen werden beschrieben, die im Hochgebirge gelegentlich beobachtet werden können. Sie werden der Anschaulichkeit halber Hellebarden- bzw. Korallen-Eis genannt. Bei ihrer Entstehung wirken anorganische Natur und Pflanzen zusammen. Das Hellebarden- oder Schlüsselbart-Eis setzt an Stämmchen und Halmen an und ist auf der Leeseite der Stängel lang ausgezogen und vertikal gezackt. Das Korallen-Eis umhüllt Seggenblätter an Quellen wie ein Etui. Bei ihm ist die Sättigung der Luft mit Feuchtigkeit entscheidend, beim Hellebarden-Eis die Form der landschaftlichen Umgebung. Es wird versucht, die Entstehung dieser auffälligen Formen zu erklären.
description: Jahreshefte der Gesellschaft für Naturkunde in Württemberg, Bd. 164 (2008): Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 164. Jahrgang
Decision Diagrams for Optimization
Creators: name: Cire, Andre Augusto
Publisher: name: Carnegie Mellon University
Year: 2014
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business

description: Decision diagrams are compact graphical representations of Boolean functions originally introduced for applications in circuit design, simulation, and formal verification. Recently, they have been considered for a variety of purposes in optimization and operations research. These include facet enumeration in integer programming, maximum flow computation in large-scale networks, solution counting in combinatorics, and learning in genetic programming techniques. In this dissertation we develop new methodologies based on decision diagrams to tackle discrete optimization problems. A decision diagram is viewed here as a graphical representation of the feasible solution set of a discrete problem. Since such diagrams may grow exponentially large in general, we work with the concept of approximate decision diagrams, first introduced by Andersen et al (2007). An approximate decision diagram is a graph of parameterized size that represents instead an over-approximation or under-approximation of the feasible solution set. Thus, it can be used to obtain either bounds on the optimal solution value or primal solutions to the problem. As our first contribution, we provide a modeling framework based on dynamic programming that can be used to specify how to build a decision diagram of a discrete optimization problem and how to approximate it, which facilitates the encoding process of a problem to a diagram representation. We then present a branching scheme that exploits the recursive structure of an approximate diagram, establishing a novel generic solver for discrete optimization problems. Computational results in classical optimization problems show that more instances can be solved in less computation time using our approach than mathematical programming techniques. In particular, we were able to reduce the known optimality gap of benchmark instances of the maximum cut problem. In our second contribution, we focus on the application of approximate diagrams to particular domains; namely, to sequencing problems, common in the context of routing and scheduling, and to timetable problems. We indicate that, besides the computation of bounds, approximate decision diagram can be used to deduce non-trivial constraints of a problem, such as precedence relations between jobs in scheduling applications. We show that such inference can be incorporated into state-of-the-art solvers and speed-up the optimization process by orders of magnitude. Finally, we propose new parallelization strategies that exploits the recursive structure of an approximate diagram. These strategies decouple a problem in a naturally loose fashion and allow for more effective load balancing heuristics when considering hundreds of computer cores.
The GALAH Survey: Verifying abundance trends in the open cluster M67 using non-LTE spectroscopy
Creators: name: Gao, Xudong
name: Lind, Karin
name: Amarsi, Anish M.
name: Buder, Sven
name: Dotter, Aaron
name: Nordlander, Thomas
name: Asplund, Martin
name: Bland-Hawthorn, Joss
name: De Silva, Gayandhi M.
name: D'Orazi, Valentina
name: Duong, Ly
name: Freeman, Ken C.
name: Kos, Janez
name: Lewis, Geraint F.
name: Lin, Jane
name: Martell, Sarah L.
name: Schlesinger, Katharine. J.
name: Sharma, Sanjib
name: Simpson, Jeffrey D.
name: Zucker, Daniel B.
name: Zwitter, Tomaz
name: Da Costa, Gary
name: Anguiano, Borja
name: Horner, Jonathan
name: Hyde, Elaina A.
name: Kafle, Prajwal R.
name: Nataf, David M.
name: Reid, Warren
name: Stello, Dennis
name: Ting, Yuan-Sen
name: collaboration, the GALAH
Publisher: name: arXiv
Year: 2018
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Open cluster members are coeval and share the same initial bulk chemical compositions. Consequently, differences in surface abundances between members of a cluster that are at different evolutionary stages can be used to study the effects of mixing and internal chemical processing. We carry out an abundance analysis of seven elements (Li, O, Na, Mg, Al, Si, Fe) in 66 stars belonging to the open cluster M67, based on high resolution GALAH spectra, 1D MARCS model atmospheres, and, for the first time for a large sample of M67 stars, non-local thermodynamic equilibrium (non-LTE) radiative transfer. From the non-LTE analysis, we find a typical star-to-star scatter in the abundance ratios of around 0.05 dex; this scatter is slightly but systematically larger when LTE is assumed instead. We find trends in the abundance ratios with effective temperature, indicating systematic differences in the surface abundances between turn-off and giant stars; these trends are more pronounced when LTE is assumed. However, in the non-LTE analysis, most of the element trends have been flattened. Two species are exceptions to this behaviour, namely Al and Si, which both clearly display remaining trends in the non-LTE analysis. We comment on the possible origin of these trends, by comparing them with recent stellar models that include atomic diffusion.
description: 14 pages, 10 figures; resubmitted to MNRAS
The Fast and the FRDR
Creators: name: Pascoe, Julienne
name: Garnett, Alex
name: Turp, Clara
name: Wilson, Lee
Publisher: name: Zenodo
Year: 2019
Subjects: Discovery
Metadata Standardization
OpenRefine
FAST

description: The Federated Research Data Repository (FRDR), developed through a partnership between the Canadian Association of Research Libraries' Portage initiative and Compute Canada, improves research data discovery in Canada by providing a single search portal for more than 100,000 metadata records indexed from over 40 Canadian governmental, institutional, and domain-specific data repositories. While this national discovery layer helps to de-silo Canadian research data, challenges in data discovery remain due to a lack of standardized metadata practices across repositories. In recognition of this challenge, a Portage working group, drawn from a national network of experts, has engaged in a project to map subject keywords to the Online Computer Library Center's (OCLC) Faceted Application of Subject Terminology (FAST) using the open source OpenRefine software. This presentation will describe the working group's project, provide a demonstration of preliminary results and examples of how this work improves data discovery, and discuss how this approach may be adopted by other repositories and metadata aggregators to support metadata standardization.
Der Urangehalt der Nürtinger Heinrichsquelle
Creators: name: Prestel, Rupert
name: Schloz, Wilhelm
Publisher: name: Jahreshefte der Gesellschaft für Naturkunde in Württemberg
Year: 2008

description: Der 80 m tiefe Brunnen der Nürtinger Heinrichsquelle erschließt in der Stubensandstein-Formation ein hochkonzentriertes, CO2-führendes Na-SO4-HCO3-Mineralwasser. Dieses wurde über Jahrzehnte als staatlich anerkanntes Heilwasser und später als therapeutisch wirksames Mineralwasser genutzt. Seine Genese wird insbesondere auf Kationenaustausch in Verbindung mit einer sehr hohen Verweilzeit des Wassers im Untergrund zurückgeführt. Im Jahr 2004 wurde ein hoher Gehalt des Mineralwassers an Uran von 0,47 mg/l und in der Kontrollanalyse von 0,42 mg/l bestimmt. Daraufhin wurde die Nutzung der Heinrichsquelle eingestellt. Schwache bis mäßige Vererzungen durch Uran sind örtlich bis regional aus dem untersten Stubensandstein durch frühere Prospektionsarbeiten und aus bohrlochgeophysikalischen Messungen der Gamma-Strahlung bekannt. Daneben ist offensichtlich die hydrochemische Beschaffenheit des Mineralwassers der Heinrichquelle für die sehr hohe Lösung des Urans, sehr wahrscheinlich in komplexer Bindungsform, verantwortlich.
description: Jahreshefte der Gesellschaft für Naturkunde in Württemberg, Bd. 164 (2008): Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 164. Jahrgang
Masses, Mixings, Yukawa Couplings and their Symmetries
Creators: name: Santamaria, Arcadi
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a method to find the number of real and imaginary observable parameters coming from the Yukawa sector in an arbitrary gauge theory. The method leads naturally to a classification of Yukawa couplings according to their symmetries and suggests a new parametrization of masses and mixings that is useful to study the behaviour of Yukawa couplings under the renormalization group. We apply it to some examples based on the Standard Model with Yukawa couplings obeying various chiral symmetries. We also show how our method of parameter counting can be used in some models with an enlarged leptonic sector.
description: 10 pages, LaTeX, CERN-TH.6801/93
Sedimentäre Architektur und 3-D-Georadaranalysen von kiesigen mäandrierenden Flussablagerungen (Neckartal, SW Deutschland)
Creators: name: Kostic, Boris
name: Aigner, Thomas
Publisher: name: Jahreshefte der Gesellschaft für Naturkunde in Württemberg
Year: 2008

description: Dieser gegenüber der Originalpublikation (Kostic & Aigner 2007) stark verkürzte Artikel beschreibt die dreidimensionale sedimentäre Architektur quartärer kiesiger Flussablagerungen im Neckartal bei Tübingen, die anhand von sedimentologischen Aufschlussstudien und Georadaranalysen des Untergrunds charakterisiert wurde. Der obere Teil des Kieskörpers weist zwei architektonisch unterschiedliche Einheiten auf, die durch eine markante Erosionsfläche getrennt sind: (1) eine untere Einheit, die von trogförmigen Ablagerungselementen dominiert wird und intern von schräggeschichteten Rollkieslagen und schlecht sortierten, massiven Kieslagen aufgebaut ist; und (2) eine obere Einheit, die durch flach einfallende Kiesschichten und eingeschaltete dünne Sandlagen gekennzeichnet ist, die durch laterale Akkretion auf einer erosiven Basisfläche abgelagert wurden. Die untere Einheit deutet vermutlich auf Ablagerungen in einem verflochtenen (‚braided‘) Flusssystem hin, während die Merkmale der oberen Einheit auf extensive ‚point bar‘ Ablagerungen schließen lassen, die durch die laterale Migration von mäandrierenden Flusskanälen geformt wurden. Letzteres wird durch die Kartierung von Luftbildern bestätigt. Die lateralen Akkretionselemente sind eng assoziert mit Durchbruchskanälen, Kiesdünen und Altarmablagerungen, während weitaushaltende tonige Überflutungssedimente die Kiesablagerungen überlagern. Georadarbilder, die die dreidimensionalen Geometrien der Ablagerungselemente offenlegen, bestätigen den Wechsel des sedimentären Stils zwischen den beiden stratigraphischen Einheiten. Kohlenstoff-14 Datierungen von Holzresten zeigen, dass dieser Wechsel zu Beginn des Holozäns stattfand und mit einer vermutlich durch klimatische Veränderungen ausgelösten Reorganisation des Flusssystems zusammenhängt. Die Integration von sedimentologischen Aufschlussstudien und Georadaranalysen hebt den heterogenen Aufbau der Neckartalflussablagerungen hervor, was ein wichtiger Faktor für die Modellierung von Grundwasserfließpfaden in Talaquiferen darstellt.
description: Jahreshefte der Gesellschaft für Naturkunde in Württemberg, Bd. 164 (2008): Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 164. Jahrgang
Decision Diagrams for Combinatorial Optimization and Satisfaction
Creators: name: Kell, Brian
Publisher: name: Carnegie Mellon University
Year: 2015
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: In this thesis we develop techniques for applying binary decision diagrams (BDDs) and multivalued decision diagrams (MDDs) to combinatorial optimization and satisfaction problems, in particular multidimensional bin packing problems and the Boolean satisfiability problem. In the multidimensional bin packing problem, each bin has a multidimensional capacity and each item has an associated multidimensional size. We develop several MDD representations for this problem and explore different MDD construction methods including a new heuristic-driven depth-first compilation scheme. We also derive MDD restrictions and relaxations, using a novel application of a clustering algorithm to identify approximate equivalence classes among MDD nodes. Our experimental results show that these techniques can significantly outperform solvers using current constraint programming and mixed-integer programming methods. The Boolean satisfiability (SAT) problem is the problem of determining whether a given propositional formula defined on a set of Boolean variables has a satisfying assignment, that is, an assignment of truth values to the variables that makes the formula true. We present a generic method for deducing valid clauses from a SAT instance using BDDs, with the aim of finding clauses that are bottlenecks for SAT solvers using conflict-directed clause learning. We formally characterize the strength of these generated clauses and show that any clause learned from SAT conflict analysis can also be generated using our method, while our method can additionally generate stronger clauses than those that are derivable using one application of conflict analysis. The method remains valid for approximate BDDs, which is important for SAT instances that are too large for an exact BDD representation. Our experimental results show that the clauses generated from BDDs can signicantly reduce the numbers of decisions and conflicts encountered by a SAT solver. In order to extend these clause generation techniques to larger SAT instances, we propose several methods to decompose a SAT instance into smaller subinstances. These methods are based on the identification of clauses that arise from the application of the widely used Tseitin transformation, the analysis of the structure of the constraint graph corresponding to the instance, and the modeling of the instance as a resistive electrical network. Preliminary experiments demonstrate that these techniques are promising areas for future research.
A pseudo-quasi-polynomial algorithm for solving mean-payoff parity games
Creators: name: Daviaud, Laure
name: Jurdzinski, Marcin
name: Lazic, Ranko
Publisher: name: arXiv
Year: 2018
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Data Structures and Algorithms (cs.DS)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: In a mean-payoff parity game, one of the two players aims both to achieve a qualitative parity objective and to minimize a quantitative long-term average of payoffs (aka. mean payoff). The game is zero-sum and hence the aim of the other player is to either foil the parity objective or to maximize the mean payoff. Our main technical result is a pseudo-quasi-polynomial algorithm for solving mean-payoff parity games. All algorithms for the problem that have been developed for over a decade have a pseudo-polynomial and an exponential factors in their running times; in the running time of our algorithm the latter is replaced with a quasi-polynomial one. By the results of Chatterjee and Doyen (2012) and of Schewe, Weinert, and Zimmermann (2018), our main technical result implies that there are pseudo-quasi-polynomial algorithms for solving parity energy games and for solving parity games with weights. Our main conceptual contributions are the definitions of strategy decompositions for both players, and a notion of progress measures for mean-payoff parity games that generalizes both parity and energy progress measures. The former provides normal forms for and succinct representations of winning strategies, and the latter enables the application to mean-payoff parity games of the order-theoretic machinery that underpins a recent quasi-polynomial algorithm for solving parity games.
BRST-anti-BRST Antifield formalism : The Example of the Freedman-Townsend Model
Creators: name: Barnich, G.
name: Constantinescu, R.
name: Gregoire, P.
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The general BRST-anti-BRST construction in the framework of the antifield-antibracket formalism is illustrated in the case of the Freedmann-Townsend model.
description: 16 pages, Latex file, Latex errors corrected, otherwise unchanged
title: ADCO, Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Cart. 32 (G 136), 745 folios, f. 0752
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2012
name: Petot, Frédéric
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: cartulaire
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge

description: Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Archives départementales de la Côte-d'Or, Cart. 32 (G 136), 745 folios, f. 0752, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Archives départementales de la Côte-d'Or, Cart. 32 (G 136), 745 folios, f. 0752, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye Saint-Étienne de Dijon
description: Provenance: http://www.wikidata.org/entity/Q15945019
Invenio User Group Workshop 2019
Creators: name: Gonzalez Lopez, Jose Benito
name: Wörner, Kai
name: Nielsen, Lars Holm
Publisher: name: Zenodo
Year: 2019
Subjects: Invenio
repository software
community meet-up

description: Invenio User Group Workshop (IUGW) is a biennial workshop where the Invenio repository community meet among users and developers from around the world. The workshop consists of a series of tour de table service presentations, talks from attendees and a brainstorming session related to the Invenio digital repository framework. We exchange knowledge and experiences and drive forward the forthcoming developments of the Invenio platform. Previous workshops have included diverse presentations from the attendees on topics like IIIF, author disambiguation in Invenio, reference extraction, ILS for Invenio , statistics and reporting in Invenio, modelling copyright and licensing in MARC, just to name a few.
Decision Diagram Relaxations for Integer Programming
Creators: name: Tjandraatmadja, Christian
Publisher: name: Carnegie Mellon University
Year: 2018
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business

description: Mixed-integer programming (MIP) is often a practitioner’s primary approach when tackling hard discrete optimization problems. This important role was enabled by decades of theory and practical experience poured into modern MIP solvers. However, many problems are still challenging for MIP solvers, which motivates the need for novel perspectives to enhance MIP technology. In this dissertation, we explore the use of relaxed decision diagrams to improve MIP solvers. Relaxed decision diagrams are graph structures that encode relaxations of discrete optimization problems. One of their many uses in optimization is to generate bounds on the optimal value, which are strong in practice in the presence of certain types of structure. However, exporting decision diagram techniques to integer programming can be challenging due to the lack of clear structure to exploit. A first step is to develop methods to construct good relaxed decision diagrams from integer programming models. We propose a framework that focuses on a substructure of the problem and incorporates remaining constraints via Lagrangian relaxation and constraint propagation. In particular, we explore the use of a prevalent substructure in MIP solvers known as the conflict graph. Computational experiments indicate that they yield strong bounds under this framework. Once we understand how to build good relaxed decision diagrams, the next question is how to apply them in the context of a MIP solver. A MIP solver has several components, which include presolve, cutting planes, primal heuristics, and branch-and-bound. We show how relaxed decision diagrams can aid each of these components throughout the subsequent chapters. In particular, we view decision diagrams from a polyhedral perspective in order to generate cutting planes. Through a connection between decision diagrams and polarity, we develop an algorithm that generates cuts that are facet-defining for the convex hull of a decision diagram relaxation. We provide computational evidence that this algorithm generates strong cuts for structured problems. Finally, we investigate a broader integration of decision diagrams into MIP solvers. First, we show how relaxed decision diagrams can be used for bound and coefficient strengthening in the presolve step of a MIP solver. Second, we investigate the effect of applying cuts from decision diagrams throughout a branch-and-bound tree. Third, we generate both primal and dual bounds from decision diagrams to improve pruning within a branch-and-bound tree, which can result in significant improvements in solving time.
Hadronic decays of the (pseudo-)scalar charmonium states $η_c$ and $χ_{c0}$ in the extended Linear Sigma Model
Creators: name: Eshraim, Walaa I.
name: Fischer, Christian S.
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the phenomenology of the ground-state (pseudo-)scalar charmonia $η_c$ and $χ_{c0}$ in the framework of a $U(4)_r \times U(4)_l$ symmetric linear sigma model with (pseudo-)scalar and (axial-) vector mesons. Based on previous results for the spectrum of charmonia and the spectrum and (OZI-dominant) strong decays of open charmed mesons, we extend the study of this model to OZI-suppressed charmonia decays. This includes decays into 'ordinary' mesons but also particularly interesting channels with scalar-isoscalar resonances $f_0(1370),\, f_0(1500),\, f_0(1710)$ that may include sizeable contributions from a scalar glueball. We study the variation of the corresponding decay widths assuming different mixings between glueball and quark-antiquark states. We also compute the decay width of the pseudoscalar $η_c$ into a pseudoscalar glueball. In general, our results for decay widths are in reasonable agreement with experimental data where available. Order of magnitude predictions for as yet unmeasured states and channels are potentially interesting for BESIII, Belle II, LHCb as well as the future PANDA experiment at the FAIR facility.
description: 20 pages, 3 figures, 6 tabes
Dynamic analysis of noncanonical warm inflation
Creators: name: Li, Xi-Bin
name: Wang, Yang-Yang
name: Wang, He
name: Zhu, Jian-Yang
Publisher: name: arXiv
Year: 2018
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study and analyze the dynamic properties of both canonical and noncanonical warm inflationary models with dissipative effects. We consider different models of canonical warm inflation with different dissipative coefficients and prove that the behavior at infinity of quadratic dissipative model distinctly differs from that of the constant dissipative model, which means that quadratic dissipative coefficient increases the possibility of the occurrence of inflation. We also show that the different choice of combination of the parameters in noncanonical warm inflation exhibits dramatically different global phase portraits on the Poincaré disk. We try to illustrate that the noncanonical field will not expand the regime of inflation, but it will increase the possibility of the occurrence of inflation as well and the duration of inflation. Then, by dynamic analysis, we can exclude several inflationary models, like the warm inflation model, with negative dissipative coefficients, and explain that the model without potential is almost impossible. With relevant results, we give the condition when reheating occurs.
description: 13 pages, 11 figures
Das merkwürdige System der Enz. Ihr Anschluss an den Neckar. Wohin floss sie vorher?
Creators: name: Fezer, Fritz
Publisher: name: Jahreshefte der Gesellschaft für Naturkunde in Württemberg
Year: 2008

description: Im ersten Teil werden einige naturwissenschaftliche Aspekte entlang des Laufs geschildert. Im zweiten wird versucht, die Entstehung zu gliedern. Hoch über dem Abschnitt Mühlacker–Bissingen war schon in der Kreidezeit ein größerer Fluss. Sein Ursprung wird in den Nordvogesen, seine Mündung im Meer bei Regensburg vermutet. Als im Eozän-Oligozän der Nordschwarzwald tektonisch aufkippte, entstanden die parallel nach Norden gerichteten Zuflüsse und überschütteten auf breiter Front das ältere Tal mit „Höhenschottern“, besonders mächtig an den Flanken. Die Uferwälle sperrten die Zuflüsse von Norden und Süden, die sich zu parallelen Talungen vereinigten. Nachdem ein Meteorit ins Ries eingeschlagen und riesige Gesteinsmassen ausgeschleudert hatte, sperrten diese den Ausgang des Urflusses und veranlassten die Enz nach Norden überzulaufen. Für 8 Mio. Jahre war sie der Oberlauf des Neckars. Erst als er sich 5– 20 m tief in das Hauptkonglomerat des Buntsandsteins und in den Oberen Muschelkalk eingeschnitten hatte, konnten sich die Talschleifen entwickeln. In der Nacheiszeit folgten dann die Wiesenmäander.
description: Jahreshefte der Gesellschaft für Naturkunde in Württemberg, Bd. 164 (2008): Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 164. Jahrgang
Decoding quantum criticalities from fermionic/parafermionic topological states
Creators: name: Wang, Zi-Qi
name: Zhu, Guo-Yi
name: Zhang, Guang-Ming
Publisher: name: arXiv
Year: 2018
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Under an appropriate symmetric bulk bipartition in a one-dimensional symmetry protected topological phase with the Affleck-Kennedy-Lieb-Tasaki matrix product state wave function for the odd integer spin chains, a bulk critical entanglement spectrum can be obtained, describing the excitation spectrum of the critical point separating the topological phase from the trivial phase with the same symmetry. Such a critical point is beyond the standard Landau-Ginzburg-Wilson paradigm for symmetry breaking phase transitions. Recently, the framework of matrix product states for topological phases with Majorana fermions/parafermions has been established. Here we first generalize these fixed-point matrix product states with the zero correlation length to the more generic ground-state wave functions with a finite correlation length for the general one-dimensional interacting Majorana fermion/parafermion systems. Then we employ the previous method to decode quantum criticality from the interacting Majorana fermion/parafermion matrix product states. The obtained quantum critical spectra are described by the conformal field theories with central charge $c\leq 1$, characterizing the quantum critical theories separating the fermionic/parafermionic topological phases from the trivial phases with the same symmetry.
description: 14 pages, 10 figures. The manuscript has been substantially expanded and revised
Der Nusplinger Plattenkalk (Weisser Jura ζ) – Grabungskampagne 2007
Creators: name: Dietl, Gerd
name: Dietl, Olga
name: Schweigert, Günter
name: Hugger, Rolf
name: Russ, Burkhart
Publisher: name: Jahreshefte der Gesellschaft für Naturkunde in Württemberg
Year: 2008

description: In der Grabungskampagne 2007 wurden etwa 200 Fossilien aus dem Nusplinger Plattenkalk geborgen. Bemerkenswert sind hierunter zahlreiche Tintenfischreste, Ammoniten mit Kiefern und Weichteilresten sowie ein Käfer und die isolierten Flügel einer Libelle und einer Skorpionsfliege. Unter den Pflanzenfossilien sind ein Koniferenzweig mit ansitzenden Zapfen und eine Zapfenschuppe mit Bernstein in den Harzkanälen hervorzuheben. An Wirbeltierfossilien fand sich eine größere Zahl an Fischen, darunter ein sehr großer, noch unpräparierter und daher unbestimmter Fisch mit dicken Schmelzschuppen. Darüber hinaus geben wir eine Zusammenstellung über die aktuellen geotouristischen Aktivitäten und Ausstellungen von Nusplinger Fossilien sowie eine Übersicht über die laufenden wissenschaftlichen Bearbeitungen des Fossilmaterials. Ein kurzer Rückblick auf die Höhepunkte von 15 Jahren Grabungsaktivität mit einer Publikationsliste schließt sich an.
description: Jahreshefte der Gesellschaft für Naturkunde in Württemberg, Bd. 164 (2008): Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 164. Jahrgang
How Information Crosses Schwarzschild's Central Singularity
Creators: name: D'Ambrosio, Fabio
name: Rovelli, Carlo
Publisher: name: arXiv
Year: 2018
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the natural extension of spacetime across Schwarzschild's central singularity and the behavior of the geodesics crossing it. Locality implies that this extension is independent from the future fate of black holes. We argue that this extension is the natural $\hbar\!\to\!0$ limit of the effective quantum geometry inside a black hole, and show that the central region contains causal diamonds with area satisfying Bousso's bound for an entropy that can be as large as Hawking's radiation entropy. This result sheds light on the possibility that Hawking radiation is purified by information crossing the internal singularity.
description: 11 pages, 8 figures; v2 fixed typos and added one reference
Detection of Spin Correlations in Optical Lattices by Light Scattering
Creators: name: de Vega, Ines
name: Cirac, J. Ignacio
name: Porras, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that spin correlations of atoms in an optical lattice can be reconstructed by coupling the system to the light, and by measuring correlations between the emitted photons. This principle is the basis for a method to characterize states in quantum computation and simulation with optical lattices. As examples, we study the detection of spin correlations in a quantum magnetic phase, and the characterization of cluster states.
Compact embeddings of model subspaces of the Hardy space
Creators: name: Baranov, Anton D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Complex Variables (math.CV)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 30D50, 30D55, 46E15, 46E22

description: We study embeddings of model (star-invariant) subspaces $K^p_Θ$ of the Hardy space $H^p$, associated with an inner function $Θ$. We obtain a criterion for the compactness of the embedding of $K^p_Θ$ into $L^p(μ)$ analogous to the Volberg--Treil theorem on bounded embeddings and answer a question posed by Cima and Matheson. The proof is based on Bernstein inequalities for functions in $K^p_Θ$. Also we study measures $μ$ such that the embedding operator belongs to a Schatten--von Neumann ideal.
description: 26 pages
Supersymmetric Signals in $γγ$ Collisions
Creators: name: Cuypers, Frank
name: van Oldenborgh, Geert Jan
name: Rückl, Reinhold
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the occurrence of final states with only an electron-positron pair and missing transverse momentum as a signal of \susy\ in photon-photon collisions. Suitable high energy photon beams may be provided at linear colliders by back-scattering laser beams on electron beams. The final states considered represent a typical signature for the production and decay of selctron and chargino pairs within the \mssm. We show that, away from the kinematical threshold, selctrons produce this signal far more abundantly than charginos. The standard model background is dominated by W-pair production. We propose a series of kinematical cuts which reduce this background to an acceptable level. With a 1 TeV collider operated in the $γγ$-mode, we find that interesting and complementary tests of \susic\ models can be performed for selctron masses up to 350 GeV.
description: 12 pages + 6 pages figures (included as uufile, also with anon. ftp from gluon.hep.physik.uni-muenchen.de (129.187.198.1)), LaTeX (axodraw,epsf), CERN-TH.6742/92, MPI-Ph/92-73, LMU-92/07. (forgot the bibliography file - my excuses)
CISAN´s Handbook of Metadata
Creators: name: Manzanera Silva, Norma Aída
name: Medina Huerta, María de los Ángeles
Publisher: name: Zenodo
Year: 2019
Subjects: Metadata
repositories
institutional repository
MiCISAN
International standards
information policy

description: In the context of Open Access the National Autonomous University of Mexico (known in Spanish as UNAM) develop one project for available to the all kind information product of academic work and research in science, social and humanities. The development includes the identification, compilation, organization, actualization and inventory of its documentary sources. From the project of the University, the Center for Research on North America (CISAN) delimits four collections; developing the Curatorial Database (BDC), standards were used for the registry, identifying those metadata that provide more information about a resource for the improvement of the user experience. CISAN Metadata for the documentary description Handbook was develop with the purpose of sharing the same language, enabled us to achieve an accurate analysis, and a unified access to information base on international standards. The handbook is divided in two parts: one, that includes: the concept, the history, the nature and features of the CISAN collections, and the other that holds the description of nearly 75 metadata, indicating name, definition, use, internal policy, tags, particular examples and the location of the sources, under international standards approved by the National Council of Science and Technology (known in Spanish as CONACYT).
Deformation of the Wakimoto construction
Creators: name: Abada, A.
name: bougourzi, A. H.
name: Gradechi, M. A. El
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present the extension of the Wakimoto construction to the $su(2)_k$ quantum current algebra and its associated $Z_k$ quantum parafermion algebra. This construction is achieved in terms of various deformations of three classical free boson fields. We also give the vertex operators corresponding to the quantum spin-$j$ representation.
description: 8 pages
Die Fossiliensammlung von Eberhard Hak
Creators: name: Dietl, Gerd
name: Schweigert, Günter
Publisher: name: Jahreshefte der Gesellschaft für Naturkunde in Württemberg
Year: 2008

description: Im Jahre 2007 stiftete Frau Griseldis Hak, Spaichingen, die Fossiliensammlung ihres vor über 20 Jahren verstorbenen Ehemanns Eberhard Hak dem Staatlichen Museum für Naturkunde in Stuttgart. Sie tat dies in der Überzeugung, dass die Sammlung ihres Mannes an dieser Institution am besten aufgehoben sei und dort auch der Wissenschaft zur Verfügung stehen würde. An die Stiftung der Sammlung knüpfte sie keinerlei Bedingungen; eine großzügige Geste, die sicherlich ganz im Sinne ihres verstorbenen Mannes ist. Die Sammlung, die vorwiegend aus Jura-Invertebraten besteht, wird aufgrund ihrer Bedeutung und Größe kurz vorgestellt. Über die Persönlichkeit des Sammlers Eberhard Hak wird hier in diesem Zusammenhang kurz berichtet.
description: Jahreshefte der Gesellschaft für Naturkunde in Württemberg, Bd. 164 (2008): Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 164. Jahrgang
From Discrete Space-Time to Minkowski Space: Basic Mechanisms, Methods and Perspectives
Creators: name: Finster, Felix
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: This survey article reviews recent results on fermion system in discrete space-time and corresponding systems in Minkowski space. After a basic introduction to the discrete setting, we explain a mechanism of spontaneous symmetry breaking which leads to the emergence of a discrete causal structure. As methods to study the transition between discrete space-time and Minkowski space, we describe a lattice model for a static and isotropic space-time, outline the analysis of regularization tails of vacuum Dirac sea configurations, and introduce a Lorentz invariant action for the masses of the Dirac seas. We mention the method of the continuum limit, which allows to analyze interacting systems. Open problems are discussed.
description: 25 pages, LaTeX, 6 figures, minor improvements (published version)
Testing Supersymmetry by Means of Time Reversal Invariance
Creators: name: Christova, E.
name: Fabbrichesi, M.
Publisher: name: arXiv
Year: 1993
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The minimal supersymmetric extension of the standard model allows for some of the coupling strengths to be complex parameters. The presence of such imaginary phases can lead to violations of time reversal invariance, which can be tested if correlations in products of an odd number of polarizations and momenta are measured and found to be different from zero. As an example, we consider the triple product $\mbox{\bf J} \cdot \left(\mbox{\bf p}_1 \times \mbox{\bf p}_ {2} \right)$ in the $β$-decay of the neutron, of the $Σ^-$, and in the decay $K^{+}_{3μ}$. For these low-energy decays, we find that the present experimental precision is not enough to provide useful bounds on combinations of such phases and the masses of the supersymmetric particles. At higher energies, the same time reversal violating correlation in the semileptonic decay of the $t$ quark is of the order of $α_s/π$, made bigger by the large mass of the decaying quark.
description: 12 pages (2 figures, not included), CERN-TH.6688/92
title: ADCO, Huitième cartulaire de Saint-Étienne de Dijon (1661-1667), Cart. 31 (G 135), 549 folios, f. 0432
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2012
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: Chartes de la Bourgogne du Moyen Âge
subject: cartulaire
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi

description: Huitième cartulaire de Saint-Étienne de Dijon (1661-1667), Archives départementales de la Côte-d'Or, Cart. 31 (G 135), 549 folios, f. 0432, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Huitième cartulaire de Saint-Étienne de Dijon (1661-1667), Archives départementales de la Côte-d'Or, Cart. 31 (G 135), 549 folios, f. 0432, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https://manuscrits.cbma-project.eu/
description: Provenance: abbaye Saint-Étienne de Dijon
description: Provenance: http://www.wikidata.org/entity/Q15945019
Parity Doubling as a Tool for Right-handed Current Searches
Creators: name: Gratrex, James
name: Zwicky, Roman
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The V-A structure of the weak interactions leads to definite amplitude hierarchies in exclusive heavy-to-light decays mediated by $b \to (d,s)γ$ and $b \to (d,s) \ell \bar{\ell}$. However, the extraction of right-handed currents beyond the Standard Model is contaminated by V-A long-distance contributions leaking into right-handed amplitudes. We propose that these quantum-number changing long-distance contributions can be controlled by considering the almost parity-degenerate vector meson final states by exploiting the opposite relative sign of left- versus right-handed amplitudes. For example, measuring the time-dependent rates of a pair of vector $V(J^P=1^-)$ and axial $A(1^+)$ mesons in $B \to (V,A) γ$, up to an order of magnitude is gained on the theory uncertainty prediction, controlled by long-distance ratios to the right-handed amplitude. This renders these decays clean probes to null tests, from the theory side.
description: 19 pages, 2 figures, version to appear in JHEP
Die Variansmergel-Formation (btV) des Schwäbischen Juras – Beschreibung und Gliederung
Creators: name: Dietl, Gerd
Publisher: name: Jahreshefte der Gesellschaft für Naturkunde in Württemberg
Year: 2008

description: Die neu eingeführte lithostratigraphische Einheit der Variansmergel-Formation (Mittel-Jura, überwiegend Mittel-Bathonium) des Schwäbischen Juras wird ausführlich erläutert. Ihre fazielle Entwicklung von Südwürttemberg bis in das Wutach-Gebiet wird dargestellt. Sie wird in zwei Untereinheiten gegliedert: Variansmergel-Subformation und Lagenalisbank. Deren Mächtigkeitsentwicklung, Altersstellung und Fossilführung wird beschrieben.
description: Jahreshefte der Gesellschaft für Naturkunde in Württemberg, Bd. 164 (2008): Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 164. Jahrgang
Data-Driven, Sparsity-Based Matched Field Processing for Structural Health Monitoring
Creators: name: Harley, Joel B.
Publisher: name: Carnegie Mellon University
Year: 2014
Subjects: subject: Computer Engineering
subject: 90699 Electrical and Electronic Engineering not elsewhere classified
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This dissertation develops a robust, data-driven localization methodology based on the integration of matched field processing with compressed sensing ℓ1 recovery techniques and scale transform signal processing. The localization methodology is applied to an ultrasonic guided wave structural health monitoring system for detecting, locating, and imaging damage in civil infrastructures. In these systems, the channels are characterized by complex, multi-modal, and frequency dispersive wave propagation, which severely distort propagating signals. Acquiring the characteristics of these propagation mediums from data represents a difficult inverse problem for which, in general, no readily available solution exists. In this dissertation, we build data-driven models of these complex mediums by integrating experimental guided wave measurements with theoretical wave propagation models and ℓ1 sparse recovery methods from compressed sensing. The data-driven models are combined with matched field processing, a localization framework extensively studied for underwater acoustics, to localize targets in complex, guided wave environments. The data-driven matched field processing methodology is then refined, through the use of the scale transform, to achieve robustness to environmental variations that distort guided waves. Data-driven matched field processing is experimentally applied to an ultrasound structural health monitoring system to detect and locate damage in aluminum plate structures.
Neural Network Detection of Data Sequences in Communication Systems
Creators: name: Farsad, Nariman
name: Goldsmith, Andrea
Publisher: name: arXiv
Year: 2018
Subjects: subject: Signal Processing (eess.SP)
subject: Information Theory (cs.IT)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: We consider detection based on deep learning, and show it is possible to train detectors that perform well without any knowledge of the underlying channel models. Moreover, when the channel model is known, we demonstrate that it is possible to train detectors that do not require channel state information (CSI). In particular, a technique we call a sliding bidirectional recurrent neural network (SBRNN) is proposed for detection where, after training, the detector estimates the data in real-time as the signal stream arrives at the receiver. We evaluate this algorithm, as well as other neural network (NN) architectures, using the Poisson channel model, which is applicable to both optical and molecular communication systems. In addition, we also evaluate the performance of this detection method applied to data sent over a molecular communication platform, where the channel model is difficult to model analytically. We show that SBRNN is computationally efficient, and can perform detection under various channel conditions without knowing the underlying channel model. We also demonstrate that the bit error rate (BER) performance of the proposed SBRNN detector is better than that of a Viterbi detector with imperfect CSI as well as that of other NN detectors that have been previously proposed. Finally, we show that the SBRNN can perform well in rapidly changing channels, where the coherence time is on the order of a single symbol duration.
description: Accepted for publication in IEEE Transactions on Signal Processing
Factorization and Discrete States in C=1 Superliouville Theory
Creators: name: Aldazabal, G.
name: Bonini, M.
name: Maldacena, J. M.
Publisher: name: arXiv
Year: 1992
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the discrete state structure of $\hat c=1$ superconformal matter coupled to 2-D supergravity. Factorization properties of scattering amplitudes are used to identify these states and to construct the corresponding vertex operators. For both Neveu-Schwarz and Ramond sectors these states are shown to be organized in SU(2) multiplets. The algebra generated by the discrete states is computed in the limit of null cosmological constant.
description: 23 pages, revtex, CNEA-CAB-92-036 and UPRF-92-352
Bericht der Gesellschaft für Naturkunde in Württemberg 2007
Creators: name: Schriftleitung Der Gesellschaft Für Naturkunde In Württemberg
Publisher: name: Jahreshefte der Gesellschaft für Naturkunde in Württemberg
Year: 2007

description: Jahreshefte der Gesellschaft für Naturkunde in Württemberg, Bd. 163 (2007): Jahreshefte der Gesellschaft für Naturkunde in Württemberg, 163. Jahrgang