cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Modulational instability in nonlocal nonlinear Kerr media
Creators: name: Krolikowski, Wieslaw
name: Bang, Ole
name: Rasmuss, Jens Juul
name: Wyller, John
Publisher: name: arXiv
Year: 2001
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We study modulational instability (MI) of plane waves in nonlocal nonlinear Kerr media. For a focusing nonlinearity we show that, although the nonlocality tends to suppress MI, it can never remove it completely, irrespectively of the particular profile of the nonlocal response function. For a defocusing nonlinearity the stability properties depend sensitively on the response function profile: for a smooth profile (e.g., a Gaussian) plane waves are always stable, but MI may occur for a rectangular response. We also find that the reduced model for a weak nonlocality predicts MI in defocusing media for arbitrary response profiles, as long as the intensity exceeds a certain critical value. However, it appears that this regime of MI is beyond the validity of the reduced model, if it is to represent the weakly nonlocal limit of a general nonlocal nonlinearity, as in optics and the theory of Bose-Einstein condensates.
description: 8 pages, submitted to Phys. Rev. E
Alternatives Merkmalspaar
Creators: name: Hellmich, Kurt
Publisher: name: Acta Albertina Ratisbonensia
Year: 2018

description: Die Biologie, die Medizin, die Pädagogik, die Pharmazie, die Soziologie usw. sind in ihrer ätiologischen Forschung zur gesicherten Erfassung von vermuteten Merkmals-Beziehungen darauf angewiesen, ihre festgestellten Stichprobenergebnisse einem gezielten statistischen Auswertungsverfahren zu unterwerfen. Dabei ist induktiv zu entscheiden, ob der Zufall als Erklärung für die n beobachteten Häufigkeiten abgelehnt oder angenommen werden muß. Als brauchbares Forschungsmittel zum Erkennen des Zusammenhanges zwischen zwei Alternativen bewährt sich in der Biometrie immer mehr die sogenannte Vierfeldertafel, in die man die beobachteten vier möglichen Häufigkeiten des Auftretens und Fehlens der beiden betrachteten Merkmale bei n Merkmalsträger-Elementen einträgt.
description: Acta Albertina Ratisbonensia, Bd. 30 (1970): Acta Albertina Ratisbonensia
On the uniform Roe algebra as a Banach algebra and embeddings of $\ell_p$ uniform Roe algebras
Creators: name: Braga, Bruno de Mendonça
name: Vignati, Alessandro
Publisher: name: arXiv
Year: 2019
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: We work on $\ell_p$ uniform Roe algebras associated to metric spaces, and on their mutual embedding. We generalize results of I. Farah and the authors to mutual embeddings of uniform Roe algebras of operators on $\ell_p$ spaces. Simultaneously, we obtain rigidity results for the classic uniform Roe $\mathrm{C}^*$-algebras which depend only on their Banach algebra structure.
Adhesion-induced phase separation of multiple species of membrane junctions
Creators: name: Chen, Hsuan-Yi
Publisher: name: arXiv
Year: 2002
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A theory is presented for the membrane junction separation induced by the adhesion between two biomimetic membranes that contain two different types of anchored junctions (receptor/ligand complexes). The analysis shows that several mechanisms contribute to the membrane junction separation. These mechanisms include (i) the height difference between type-1 and type-2 junctions is the main factor which drives the junction separation, (ii) when type-1 and type-2 junctions have different rigidities against stretch and compression, the ``softer'' junctions are the ``favored'' species, and the aggregation of the softer junction can occur, (iii) the elasticity of the membranes mediates a non-local interaction between the junctions, (iv) the thermally activated shape fluctuations of the membranes also contribute to the junction separation by inducing another non-local interaction between the junctions and renormalizing the binding energy of the junctions. The combined effect of these mechanisms is that when junction separation occurs, the system separates into two domains with different relative and total junction densities.
description: 23 pages, 6 figures
The Category of Node-and-Choice Forms, with Subcategories for Choice-Sequence Forms and Choice-Set Forms
Creators: name: Streufert, Peter A.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Theoretical Economics (econ.TH)
subject: Logic in Computer Science (cs.LO)
subject: Category Theory (math.CT)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 91A70

description: The literature specifies extensive-form games in many styles, and eventually I hope to formally translate games across those styles. Toward that end, this paper defines $\mathbf{NCF}$, the category of node-and-choice forms. The category's objects are extensive forms in essentially any style, and the category's isomorphisms are made to accord with the literature's small handful of ad hoc style equivalences. Further, this paper develops two full subcategories: $\mathbf{CsqF}$ for forms whose nodes are choice-sequences, and $\mathbf{CsetF}$ for forms whose nodes are choice-sets. I show that $\mathbf{NCF}$ is "isomorphically enclosed" in $\mathbf{CsqF}$ in the sense that each $\mathbf{NCF}$ form is isomorphic to a $\mathbf{CsqF}$ form. Similarly, I show that $\mathbf{CsqF_{\tilde a}}$ is isomorphically enclosed in $\mathbf{CsetF}$ in the sense that each $\mathbf{CsqF}$ form with no-absentmindedness is isomorphic to a $\mathbf{CsetF}$ form. The converses are found to be almost immediate, and the resulting equivalences unify and simplify two ad hoc style equivalences in Kline and Luckraz 2016 and Streufert 2019. Aside from the larger agenda, this paper already makes three practical contributions. Style equivalences are made easier to derive by [1] a natural concept of isomorphic invariance and [2] the composability of isomorphic enclosures. In addition, [3] some new consequences of equivalence are systematically deduced.
description: 43 pages, 9 figures
Canthidium flavum Balthasar 1939
Creators: name: Bezděk, Aleš
name: Hájek, Jiří
name: Ascr, Biology Centre
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium flavum

description: Canthidium flavum Balthasar, 1939
 Canthidium flavum Balthasar, 1939a: 125.
The holotype is deposited in NMPC (ex coll. V. Balthasar): HOLOTYPE (♀): ‘ Loja Ostcordill. / Sabarilla / F. Ohs. 2. 10. 05 // Typus [p, red label, black margin] // Canthidium /
flavum n. sp. [hw] / Dr. V. Balthasar det [p] // Mus. Nat. Pragae [p] / 26236 [hw] / Inv. [p, orange label] // flavum
m. [hw, green label, black margin]’.
 Current status. Valid species.
description: Published as part of Bezděk, Aleš, Hájek, Jiří & Ascr, Biology Centre, 2012, Catalogue of type specimens of beetles (Coleoptera) deposited in the National Museum, Prague, Czech Republic, pp. 297-334 in Acta Entomologica Musei Nationalis Pragae 52 (1) on pages 301-302, DOI: 10.5281/zenodo.5330401
On the identification of a nonlinear term in a reaction-diffusion equation
Creators: name: Kaltenbacher, Barbara
name: Rundell, William
Publisher: name: arXiv
Year: 2019
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: Primary: 35R30, 65M32, Secondary: 35R11

description: Reaction-diffusion equations are one of the most common partial differential equations used to model physical phenomenon. They arise as the combination of two physical processes: a driving force $f(u)$ that depends on the state variable $u$ and a diffusive mechanism that spreads this effect over a spatial domain. The canonical form is $u_t - \triangle u = f(u)$. Application areas include chemical processes, heat flow models and population dynamics. The direct or forwards problem for such equations is now very well-developed and understood. However, our interest lies in the inverse problem of recovering the reaction term $f(u)$ not just at the level of determining a few parameters in a known functional form, but recovering the complete functional form itself. To achieve this we set up the usual paradigm for the parabolic equation where $u$ is subject to both given initial and boundary data, then prescribe overposed data consisting of the solution at a later time $T$. For example, in the case of a population model this amounts to census data at a fixed time. Our approach will be two-fold.First we will transform the inverse problem into an equivalent nonlinear mapping from which we seek a fixed point. We will be able to prove important features of this map such as a self-mapping property and give conditions under which it is contractive. Second, we consider the direct map from $f$ through the partial differential operator to the overposed data. We will investigate Newton schemes for this case. In recent decades various anomalous processes have been used to generalize classical Brownian diffusion. Amongst the most popular is one that replaces the usual time derivative by a fractional one of order $α\leq 1$. We will also include this model in our analysis. The final section of the paper shows numerical reconstructions that demonstrate the viability of the suggested approaches.
RAVA for Natural Programming.
Creators: name: Dr Bheemaiah, Anil Kumar
Publisher: name: Zenodo
Year: 2019
Subjects: RAVA
Natural Programming
RPA
Flex-Rules
State Machines
Alexa based Robotics.
IFTTT
RAVATTT

description: RAVA is a new natural programming language for interaction with bot agents, much like IFTTT. Extending IFTTT to arbitrary natural programming, RAVA is a state machine and flex-rule based DPA system for work and robotic automation with integration to many available platforms, Alexa, Siri, Google, Botlibre and IBM Watson. RAVATTT is a new portal in development for this purpose. This talk is an introduction to the RAVA language with examples of Alexa based robot automation.
Messmethoden für den Strahlenschutz
Creators: name: Hess, B.
name: Köck, I.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2018

description: Die rasche Erforschung und Handhabung der Kernreaktionen hat in drei Dezennien durch Ausnutzung der verschiedenartigen Atomkernstrahlungen, der großen Zeitskala der Zerfallsgeschwindigkeiten und der auf kleinstem Raum konzentrierten großen Energien schon zu einem sehr vielschichtigen Gebrauch derselben in Naturwissenschaft, Medizin und Technik geführt. Trotz dieser raschen Entwicklung ist dank der gleichzeitig entwickelten Schutzmaßnahmen die Zahl der gesundheitlich geschädigten Personen bei der friedlichen Nutzung der Kernreaktionen ausnehmend gering. Dem Strahlenschutz obliegt es, neben der Überwachung der Wirksamkeit der Schutzvorrichtungen dafür zu sorgen, daß auch die bei Unglücksfällen und falscher Handhabung, mit deren Möglichkeit immer gerechnet werden muß, applizierten Personendosen festgestellt werden können. Da es ferner bei katastrophalen Ereignissen nicht zu umgehen sein wird, daß sich Rettungsmannschaften kurzzeitig größeren Momentandosen aussetzen, müssen Personendosimeter zur Verfügung stehen, die auch die jeweiligen örtlichen Dosis leistungen abzulesen gestatten. In der folgenden Studie werden deshalb unter Beschränkung auf die für den Strahlenschutz in der Hauptsache in Frage kommenden Gamma- und Neutronenstrahlen sowohl Methoden behandelt, die noch sehr kleine Strahlungsleistungen radioaktiver Verseuchung und kleine applizierte Dosen zu messen gestatten, als Methoden zur Registrierung der Dosen kurzzeitiger intensiver Strahlenflüsse, wie sie bei Unglücksfällen an Reaktoren Vorkommen können. Im zweiten Teil (Diskussion) wird die Verwendbarkeit der Meßmethoden für die praktische Dosimetrie, insbesondere ihre Eignung zur Konstruktion von Individualdosimetern diskutiert.
description: Acta Albertina Ratisbonensia, Bd. 28 (1967): Acta Albertina Ratisbonensia
Die Parkanlagen und Botanischen Gärten von Regensburg
Creators: name: Pongratz, Ludiwg
Publisher: name: Acta Albertina Ratisbonensia
Year: 2018

description: In der vorliegenden Arbeit wurde die ausgedehnte Allee zu den Parkanlagen von Regensburg gerechnet, während die vielen wertvollen privaten Gärten zu den Botanischen Gärten gezählt wurden. Bei dem ständigen Wechsel der Sommerblumen und Stauden konnte ich mich in der Hauptsache nur auf die Invarianten der Gartenkunst, auf Bäume und Sträucher einlassen; dabei habe ich mich auf die wichtigsten und selteneren Vorkommnisse beschränkt. Aber auch Bäume, besonders die wertvollen „Ausländer“ sind sterblich und vergehen. Das Stadtgartenamt ist jedoch offensichtlich bemüht, entstehende Lücken möglichst am alten Standort aufzufüllen und so den alten Reichtum zu erhalten. Was die botanischen Namen anbelangt, so habe ich mich bei der Nomenklatur an Zander Robert, Handwörterbuch der Pflanzennamen 1964, Verlag Eüge'n Ulmer, Stuttgart, gehalten. Infolgedessen habe ich auch die ursprüngliche Schreibweise von Linne z. B. sylvatica statt silvatica beibehalten. Zwar sind die Menschen häufig der Meinung, ein Ding zu kennen, wenn sie seinen Namen kennen; trotzdem habe ich mich bemüht, im Register nicht nur die Namen der betreffenden Pflanze zu nennen, sondern auch deren Hauptkennzeichen, Blütezeit und Herkunft. Zu bestem Dank bin ich dem Regensburger Stadtgartenamt und dessen Direktor Herrn Rudolf Hehr, für bereitwillige Auskünfte verpflichtet. Doch hätte ich die vorliegende Arbeit nie fertiggebracht, wenn ich nicht die Unterstützung hervorragender Dendrologen gefunden hätte: Frau Elli S c h r ö e r und die Herren L e b o l d und Vierzigmann vom Stadtgartenamt haben mich wiederholt bei der Begehung der Anlagen begleitet und auf seltene Schätze, aber auch auf manche lrrtümer aufmerksam gemacht. Mein Freund, Professor Franz E r m e r, als heimischer Maler weit über die Grenzen unserer engeren Heimat bekannt, hatte die Freundlichkeit, die von mir entworfenen Pläne künstlerisch zu gestalten und dadurch erst für den richtigen Gebrauch zu formen. Herr Karlheinz Esser, Verleger der Mittelbayerischen Zeitung, ist uns durch die kostenlose Herstellung der vielen Klischees entgzgengekommen. Münchener Freunde haben durch ihren Beitrag die Herausgabe dieser Arbeit erst ermöglicht. Stadtgartendirektor Rudolf Hehr stiftete außerdem noch 300,- DM und die Samenhandlung Haubensack sowie die Installationsfirma Hanns Karl schossen noch je 100,- DM zu. Ihnen allen sei nochmals herzlichst gedankt!
description: Acta Albertina Ratisbonensia, Bd. 27 (1966): Acta Albertina Ratisbonensia
Maximum Entropy Based Significance of Itemsets
Creators: name: Tatti, Nikolaj
Publisher: name: arXiv
Year: 2019
Subjects: subject: Machine Learning (cs.LG)
subject: Databases (cs.DB)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We consider the problem of defining the significance of an itemset. We say that the itemset is significant if we are surprised by its frequency when compared to the frequencies of its sub-itemsets. In other words, we estimate the frequency of the itemset from the frequencies of its sub-itemsets and compute the deviation between the real value and the estimate. For the estimation we use Maximum Entropy and for measuring the deviation we use Kullback-Leibler divergence. A major advantage compared to the previous methods is that we are able to use richer models whereas the previous approaches only measure the deviation from the independence model. We show that our measure of significance goes to zero for derivable itemsets and that we can use the rank as a statistical test. Our empirical results demonstrate that for our real datasets the independence assumption is too strong but applying more flexible models leads to good results.
description: Journal version. The previous version is the conference paper
Naturforscher im Regensburger und ostbayerischen Raum
Creators: name: Pongratz, Ludiwg
Publisher: name: Acta Albertina Ratisbonensia
Year: 2018

description: Die vorliegende Arbeit ist ein Versuch das Andenken an jene Naturforscher, große und kleine, wachzuhalten, die in einem Raume gewirkt haben, der erst in jüngster Zeit wieder neue Beachtung gefunden hat. Als Bibliothekar des Naturwissenschaftlichen Vereins Regensburg fand ich reichliches Material im Vereinsarchiv, aber auch in der Hinterlassenschaft des früheren Vereinsbibliothekars, Oberstadtschulrat Josef Adler, der mit riesigem Fleiß Stoff gesammelt und zum Teil verarbeitet hat; ich habe seine Beiträge als „Manuskript Adler“ erwähnt. In den einzelnen Abschnitten wurden die verschiedenen Forscher in zeitlicher Reihenfolge besprochen. Möglich wurde meine Arbeit durch das freundliche Entgegenkommen der Regensburger Staatlichen Bibliothek (Dr. Hauschka), der Fürstlichen Hofbibliothek, der Bücherei der Phil.-Theol. Hochschule und besonders durch liebenswürdige Hilfe von seiten des Herrn Oberregierungsrat Otto Fürnrohr, Archivars des Historischen Vereins von Oberpfalz und Regensburg. Oberstudienrat Dr. Arthur Schmidt, Leiter des Naturkundemuseums Regensburg, und Rektor Hermann Flank gaben mir wertvolle Winke. Großer Dank gebührt auch den Archiven der Städte Erlangen, Hamburg, Regensburg, Weiden, Vohenstrauß und der Universität Marburg. Durch Übertragung meiner schlechten Handschrift in Maschinenschrift unterstützten mich die liebenswürdigen Damen Gerti Kursawe-München, Erna Meierhof er-Regensburg und Inge Stubenrauch-Duisburg. Für die kostenlose Herstellung von 85 Klischees schulden wir Herrn Karlheinz Esser von der Mittelbayerischen Druckerei und Verlags-Gesellschaft in Regensburg herzlichen Dank. Für die großzügige finanzielle Unterstützung darf ich im Namen des Naturwissenschaftlichen Vereins Regensburg dem Bayerischen Staatsministerium für Unterricht und Kultus, dem Bezirksausschuß der Oberpfalz, dem Stadtrat Regensburg und meinen ehemaligen Schülern, die in leitender Stellung im Hause Siemens tätig sind oder wie Herr Hans Klepper, Rosenheim, im eigenen Betrieb wirken, den herzlichsten Dank aussprechen.
description: Acta Albertina Ratisbonensia, Bd. 25 (1963): Acta Albertina Ratisbonensia
Path finding strategies in scale-free networks
Creators: name: Kim, Beom Jun
name: Yoon, Chang No
name: Han, Seung Kee
name: Jeong, Hawoong
Publisher: name: arXiv
Year: 2001
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We numerically investigate the scale-free network model of Barab{á}si and Albert [A. L. Barab{á}si and R. Albert, Science {\bf 286}, 509 (1999)] through the use of various path finding strategies. In real networks, global network information is not accessible to each vertex, and the actual path connecting two vertices can sometimes be much longer than the shortest one. A generalized diameter depending on the actual path finding strategy is introduced, and a simple strategy, which utilizes only local information on the connectivity, is suggested and shown to yield small-world behavior: the diameter $D$ of the network increases logarithmically with the network size $N$, the same as is found with global strategy. If paths are sought at random, $D \sim N^{0.5}$ is found.
description: 4 pages, final form
Quantum Circuits for Dynamic Runtime Assertions in Quantum Computation
Creators: name: Zhou, Huiyang
name: Byrd, Gregory
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we propose quantum circuits for runtime assertions, which can be used for both software debugging and error detection. Runtime assertion is challenging in quantum computing for two key reasons. First, a quantum bit (qubit) cannot be copied, which is known as the non-cloning theorem. Second, when a qubit is measured, its superposition state collapses into a classical state, losing the inherent parallel information. In this paper, we overcome these challenges with runtime computation through ancilla qubits, which are used to indirectly collect the information of the qubits of interest. We design quantum circuits to assert classical states, entanglement, and superposition states.
Spin Logic Devices via Electric Field Controlled Magnetization Reversal by Spin-Orbit Torque
Creators: name: Yang, Meiyin
name: Deng, Yongcheng
name: Wu, Zhenhua
name: Cai, Kaiming
name: Edmonds, Kevin William
name: Li, Yucai
name: Sheng, Yu
name: Wang, Sumei
name: Cui, Yan
name: Luo, Jun
name: Ji, Yang
name: Zheng, Hou-Zhi
name: Wang, Kaiyou
Publisher: name: arXiv
Year: 2019
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We describe a spin logic device with controllable magnetization switching of perpendicularly magnetized ferromagnet / heavy metal structures on a ferroelectric (1-x)[Pb(Mg1/3Nb2/3)O3]-x[PbTiO3] (PMN-PT) substrate using current-induced spin-orbit torque. The devices were operated without an external magnetic field and controlled by voltages as low as 10 V applied across the PMN-PT substrate, which is much lower compared to previous reports (500 V). The deterministic switching with smaller voltage was realized from the virgin state of the PMN-PT. Ferroelectric simulation shows the unsaturated minor loop exhibits obvious asymmetries in the polarizations. Larger polarization can be induced from the initial ferroelectric state, while it is difficult for opposite polarization. The XNOR, AND, NAND and NOT logic functions were demonstrated by the deterministic magnetization switching from the interaction between the spin-orbit torque and electric field at the PMN-PT/Pt interface. The nonvolatile spin logic scheme in this work is simple, scalable, programmable, which are favorable in the logic-in-memory design with low energy consumption.
Supplementary Material 1 from Mathematical models incorporating a multi-stage cell cycle replicate normally hidden inherent synchronization in cell proliferation
Creators: name: Vittadello, Sean T.
name: McCue, Scott W.
name: Gency Gunasingh
name: Haass, Nikolas K.
name: Simpson, Matthew J.
Publisher: name: The Royal Society
Year: 2019
Subjects: subject: 60114 Systems Biology
subject: FOS: Biological sciences
subject: Computational Biology
subject: 10202 Biological Mathematics
subject: FOS: Mathematics

description: Additional results and discussion
Research Computing at a Business University
Creators: name: Wells, Jason
name: Coulter, J. Eric
Publisher: name: arXiv
Year: 2019
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Research Computing demands are exploding beyond traditional disciplines due to the proliferation of data in all walks of life. At Bentley University ("Bentley"), a business university in the Boston area, this expansion has been most readily seen in our Accounting, Economics, Mathematics, and Natural Sciences departments. The result has been a small effort to build a research computing capability at this small New England university. This poster will serve as an overview of the steps taken to build such an effort at a business university, the revelations we have had along the way, and our plans for the future.
description: 5 pages, 5 figures, presented at PEARC19 in Chicago, IL
Global mild solutions of the Landau and non-cutoff Boltzmann equations
Creators: name: Duan, Renjun
name: Liu, Shuangqian
name: Sakamoto, Shota
name: Strain, Robert M.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: This paper proves the existence of small-amplitude global-in-time unique mild solutions to both the Landau equation including the Coulomb potential and the Boltzmann equation without angular cutoff. Since the well-known works (Guo, 2002) and (Gressman-Strain-2011, AMUXY-2012) on the construction of classical solutions in smooth Sobolev spaces which in particular are regular in the spatial variables, it still remains an open problem to obtain global solutions in an $L^\infty_{x,v}$ framework, similar to that in (Guo-2010), for the Boltzmann equation with cutoff in general bounded domains. One main difficulty arises from the interaction between the transport operator and the velocity-diffusion-type collision operator in the non-cutoff Boltzmann and Landau equations; another major difficulty is the potential formation of singularities for solutions to the boundary value problem. In the present work we introduce a new function space with low regularity in the spatial variable to treat the problem in cases when the spatial domain is either a torus, or a finite channel with boundary. For the latter case, either the inflow boundary condition or the specular reflection boundary condition is considered. An important property of the function space is that the $L^\infty_T L^2_v$ norm, in velocity and time, of the distribution function is in the Wiener algebra $A(Ω)$ in the spatial variables. Besides the construction of global solutions in these function spaces, we additionally study the large-time behavior of solutions for both hard and soft potentials, and we further justify the property of propagation of regularity of solutions in the spatial variables.
description: 65 pages
Measuring timing properties of PSR B0540-69
Creators: name: Kim, Minjun
name: An, Hongjun
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on the timing properties of the `Crab twin' pulsar PSR~B0540$-$69 measured with X-ray data taken with the Swift telescope over a period of 1100\,days. The braking index of the pulsar was estimated to be $n = 0.03\pm0.013$ in a previous study performed in 2015 with 500-day Swift data. This small value of $n$ is unusual for pulsars, and a comparison to old measurements of $n\approx2.1$ for the same target determined $\sim$10 years ago suggests a dramatic change in the braking index. To confirm the small value and large change of $n$, we used 1100-day Swift observations including the data used for measuring $n=0.03$. In this study we found that the braking index of PSR~B0540$-$69 is $n=0.163\pm0.001$, somewhat larger than $0.03$. Since the measured value of $n$ is still much smaller than $2.1$, we can confirm the dramatic change in the braking index for this pulsar.
description: 7 pages, 4 figures, Accepted to JKAS
Phosphosiderit und Strengit von Pleystein in Ostbayern
Creators: name: Wilke, Harry
Publisher: name: Acta Albertina Ratisbonensia
Year: 2018

description: Phosphosiderit und Strengit, zwei Modifikationen der Verbindung Fe[P04]- 2H20, treten in der Natur selten und meist in kleinkristallinen Aggregaten, nur ausnahmsweise in idiomorphen Einzelkristallen auf. Eines der bekanntesten Vorkommen ist der Quarzpegmatit von Pleystein in der Oberpfalz; hier sind die genannten Mineralien, paragenetisch mit weiteren Phosphaten verknüpft, in einer wohl einzigartig schönen Ausbildung und in reicher Menge gefunden worden. Die vorliegende chemische, morphologische und paragenetische Bearbeitung wurde an älterem Belegmaterial begonnen, das im Institut für Mineralogie der Technischen Universität Berlin vorhanden war. Weiteres Material stammte aus dem Jahre 1951, als bei Ausschachtungsarbeiten zum Bau eines Trinkwasserbehälters gut kristallisierte Stufen geborgen werden konnten. Noch während der Durchführung der Arbeit wurden durch einen Felssturz (6. März 1960) erneut phosphatführende Partien freigelegt, die ebenfalls Phosphosiderit und Strengit in selten großen Exemplaren von prächtig roter bzw. blauer Farbe enthielten. Wir konnten davon an Ort und Stelle reichlich Material sammeln und die Untersuchungen auf diese jüngsten Funde ausdehnen. Angeregt wurde die Arbeit durch Herrn Professor Dr. Dr. H. Strunz, dem ich für sein stetes Interesse und die wohlwollende Unterstützung und Förderung auch an dieser Stelle herzlich danken möchte. Für die Überlassung interessanter Mineralstufen danke ich ferner Herrn Dipl.- Landwirt Wilhelm V i erlin g in Weiden und den Herren Michael Liebl und Georg Müller in Pleystein.
description: Acta Albertina Ratisbonensia, Bd. 23 (1959): Acta Albertina Ratisbonensia
Canthidium gigas Balthasar 1939
Creators: name: Bezděk, Aleš
name: Hájek, Jiří
name: Ascr, Biology Centre
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Canthidium
Canthidium gigas

description: Canthidium gigas Balthasar, 1939
 Canthidium gigas Balthasar, 1939a: 127.
The holotype is deposited in NMPC (ex coll. V. Balthasar):
HOLOTYPE (unsexed specimen): ‘Cayenne [p, green label] // Coll. C. Felsche / Kauf 20. 1918 [p, green label] //
Typus [p, red label, black margin] // C. gigas / sp. n. [hw] / Dr. V. Balthasar det. [p] // gigas m. [hw, green label,
black margin]’.
 Current status. Canthidium (Canthidium) gigas Balthasar, 1939, see MARTÍNEZ & HALFFTER (1986).
description: Published as part of Bezděk, Aleš, Hájek, Jiří & Ascr, Biology Centre, 2012, Catalogue of type specimens of beetles (Coleoptera) deposited in the National Museum, Prague, Czech Republic, pp. 297-334 in Acta Entomologica Musei Nationalis Pragae 52 (1) on page 302, DOI: 10.5281/zenodo.5330401
FPU $β$ model: Boundary Jumps, Fourier's Law and Scaling
Creators: name: Aoki, Kenichiro
name: Kusnezov, Dimitri
Publisher: name: arXiv
Year: 2001
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We examine the interplay of surface and volume effects in systems undergoing heat flow. In particular, we compute the thermal conductivity in the FPU $β$ model as a function of temperature and lattice size, and scaling arguments are used to provide analytic guidance. From this we show that boundary temperature jumps can be quantitatively understood, and that they play an important role in determining the dynamics of the system, relating soliton dynamics, kinetic theory and Fourier transport.
description: 5pages, 5 figures
Real-time density-matrix coupled-cluster approach for closed and open systems at finite temperature
Creators: name: Shushkov, Philip
name: Miller, Thomas F.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We extend the coupled-cluster method to correlated quantum dynamics of both closed and open systems at finite temperatures using the thermo-field formalism. The approach expresses the time-dependent density matrix in an exponential ansatz and describes time-evolution along the Keldysh path contour. A distinct advantage of the approach is exact trace-preservation as a function of time, ensuring conservation of probability and particle number. Furthermore, the method avoids the computation of correlated bra-states, simplifying the computational implementation. We develop the method in a thermal quasi-particle representation, which allows seamless connection to the projection method and diagrammatic techniques of the traditional coupled-cluster formalism. For comparison, we also apply the thermo-field framework to renormalization-group methods to obtain reference results for closed and open systems at finite temperatures. We test the singles and doubles approximation to the density-matrix coupled-cluster method on the correlated electronic dynamics of the single-impurity Anderson model, demonstrating that the new method successfully captures the correlated dynamics of both closed systems at finite temperature and driven-dissipative open systems. This encouraging performance motivates future applications to non-equilibrium quantum many-body dynamics in realistic systems.
Inhalts-Verzeichniss
Creators: name: N., N.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Jahresbericht und Kassenbericht des naturwissenschaftlichen Vereins in Regensburg für die Jahre 1901 und 1902...................................................III Mitglieder-Verzeichniss............................... XV Einläufe zur Bibliothek 1901/02 .................. XXII Original-Abhandlungen: Dr. Brunhuber: Zwei Erdbeben im Gebiete der Oberpfalz.1 Dr. H. Steinmetz: Ueber das Blau in der Natur ............. 15 Miss M. S. Jolmstou: Die vulkanischen Erscheinungen in Neu-Seeland.................................................... . 25 M. Lagally: Ueber Schutzfarben der Fische.....................35 Entomologi sc he Neuigkeiten:.....................................52
description: Acta Albertina Ratisbonensia, Bd. 9 (1903): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg IX. Heft für die Jahre 1901 und 1902
Unidirectional Propagation of an Ultra-Short Electromagnetic Pulse in a Resonant Medium with High Frequency Stark Shift
Creators: name: Caputo, Jean-Guy
name: Maimistov, Andrei
Publisher: name: arXiv
Year: 2001
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We consider in the unidirectional approximation the propagation of an ultra short electromagnetic pulse in a resonant medium consisting of molecules characterized by a transition operator with both diagonal and non-diagonal matrix elements. We find the zero-curvature representation of the reduced Maxwell-Bloch equations in the sharp line limit. This can be used to develop the inverse scattering transform method to solve these equations. Finally we obtain two types of exact traveling pulse solutions, one with the usual exponential decay and another with an algebraic decay.
description: Latex, 10 pages, no figures
Nonlocal Thresholds for Improving the Spatial Resolution of Pixel Detectors
Creators: name: Nachman, Benjamin
name: Spies, Alex
Publisher: name: arXiv
Year: 2019
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Pixel detectors only record signals above a tuned threshold in order to suppress noise. As sensors become thinner, pitches decrease, and radiation damage reduces the collected charge, it is increasingly desirable to lower thresholds. By making the simple, but powerful observation that hit pixels tend to be spatially close to each other, we introduce a scheme for dynamic thresholds. This dynamic scheme can enhance the signal efficiency without significantly increasing the occupancy. In addition to presenting a selection of empirical results, we also discuss some potential methods for implementing dynamic thresholds in a realistic readout chip for the Large Hadron Collider or other future colliders.
description: 15 pages, 6 figures
Correlation analysis from Evolution of mantis shrimp telson armour and its role in ritualized fighting
Creators: name: Taylor, Jennifer R. A.
name: Scott, Nina I.
name: Rouse, Greg W.
Publisher: name: The Royal Society
Year: 2019
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 110601 Biomechanics
subject: FOS: Health sciences
subject: 90301 Biomaterials
subject: FOS: Medical engineering

description: Mesquite correlation analysis of telson COR and Stiffness
[Nachruf] Hofrat Dr. G. Herrich-Schaeffer
Creators: name: Fürnrohr, H.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Gustav Adolf Herrich-Sc.haeffer, geb. zu Regensburg am 24. August 18 »6, gestorben daselbst am 21. Januar 1903, war ein Sohn des 1874 verstorbenen früheren Kreis- und Stadtgerichtsarztes, späteren Medizinalraths Dr. August Herrich-Schaeffer, des berühmten Entomologen, welcher als erster Träger dieses Namens erscheint. Die Verbindung dieser beiden in der wissenschaftlichen Welt wohlbekannten und angesehenen Namen, Herrich und Schaeffer, verdient einen kurzen genealogischen Rückblick.
description: Acta Albertina Ratisbonensia, Bd. 9 (1903): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg IX. Heft für die Jahre 1901 und 1902
Non-monotonic effect of additive particle size on the glass transition in polymers
Creators: name: Zirdehi, Elias M.
name: Varnik, Fathollah
Publisher: name: arXiv
Year: 2019
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Effect of small additive molecules on the structural relaxation of polymer melts is investigated via molecular dynamics simulations. At a constant external pressure and a fixed number concentration of added molecules, the variation of particle diameter leads to a non-monotonic change of the relaxation dynamics of the polymer melt. For non-entangled chains, this effect is rationalized in terms of an enhanced added-particle-dynamics which competes with a weaker coupling strength upon decreasing the particle size. Interestingly, cooling simulations reveal a non-monotonic effect on the glass transition temperature also for entangled chains, where the effect of additives on polymer dynamics is more intricate. This observation underlines the importance of monomer-scale packing effects on the glass transition in polymers. In view of this fact, size-adaptive thermosensitive core-shell colloids would be a promising candidates route to explore this phenomenon experimentally.
description: 10 pages, 9 figures
Spin-Wave Description of Haldane-gap antiferromagnets
Creators: name: Yamamoto, Shoji
name: Hori, Hiromitsu
Publisher: name: arXiv
Year: 2002
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Modifying the conventional antiferromagnetic spin-wave theory which is plagued by the difficulty of the zero-field sublattice magnetizations diverging in one dimension, we describe magnetic properties of Haldane-gap antiferromagnets. The modified spin waves, constituting a grand canonical bosonic ensemble so as to recover the sublattice symmetry, not only depict well the ground-state correlations but also give useful information on the finite-temperature properties.
description: to be published in J. Phys. Soc. Jpn. Vol. 72, No. 4 (2003)
Der Weihermühlberg bei Regenstauf
Creators: name: Weinschenk, N.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Ein geologisch und petrographisch sehr interessanter Punkt in der Umgebung Regensburgs ist der einen Kilometer östlich von Regenstauf gelegene Weihermühlborg. Er bildet die südöstliche Fortsetzung des gegen das Regental vorspringenden Regenstaufer Schlossberges und besteht wie dieser aus dem hier weit verbreiteten grauen oder rötlichen Porphyrgranit (sogen. Krystallgranit Gümbels). Dieser ist bis in ziemliche Tiefen verwittert, und lockerer Granitgrus bedeckt zum grossen Teile die steilen Abhänge des Hügels. Unmittelbar bei der Weihermühle wird in einer Sandgrube das lockere Material ausgebeutet, das trotz seines völlig desaggregirten Zustandes sich durch den guten Erhaltungszustand der Feldspate und dem Mangel an Kaolinbildung auszeichnet. Es finden sich hier lose ziemlich gut ausgebildete Karlsbader Zwillinge von Orthoklas bis zu einer Grösse von 15 cm, mit rauhen, von Quarz und Glimmer besetzten Flächen. In derselben Grube zeigen sich dunklere, feinkörnige, oft deutlich schiefrige Partien von nicht unansehnlicher Grösse, die noch weitgehender verändert sind, und die man nur als Reste ursprünglicher Hornfelsschollen ansehen kann.
description: Acta Albertina Ratisbonensia, Bd. 9 (1903): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg IX. Heft für die Jahre 1901 und 1902
Wichtige Funde fossiler Knochen in Arkadien
Creators: name: Bürchner, L.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Ich führe die Leser dieser Zeitschrift in die Landschaft Arkadien der südlichen griechischen Halbinsel Peloponnesos. In der Umgebung der ausgedehnten Ruinen der alten Stadt Megalopolis, die ihre Entstehung um 370 v. Chr. dem Betreiben des ausgezeichneten Staatsmanns und siegreichen Feldherrn Epameinondas ans Theben verdankte, hat man seit uralter Zeit Gebeine und Zähne von einer Urelefantenart und vom bos primigenius gefunden. Der griechische Schriftsteller Pansanias aus nachklassischer Zeit, von dem wir 10 Bücher einer wertvollen Beschreibung des alten Griechenlands haben, berichtet VIII 32,5 dieses Werks, dass beim Heiligtum der Artemis Agrotera zu Megalopolis riesige „menschliche“ Gebeine aufgestellt wären, von denen man glaube, sie hätten einem der Giganten zugehört, die unter Führung des Hopladamos der Rhea zu Hilfe geeilt seien. Jedenfalls waren diese riesenhaften Knochen Reste von einem dieser gewaltigen Urtiere, wie sie im 19. Jahrhundert durch zufällige Funde zu Tage gekommen sind. Die Meinung, dass diese ungewöhnlich grossen Knochen Menschen angehört haben, ist jetzt noch beim gemeinen Volk verbreitet.
description: Acta Albertina Ratisbonensia, Bd. 9 (1903): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg IX. Heft für die Jahre 1901 und 1902
Surface critical exponents at a uniaxial Lifshitz point
Creators: name: Pleimling, Michel
Publisher: name: arXiv
Year: 2001
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: Using Monte Carlo techniques, the surface critical behaviour of three-dimensional semi-infinite ANNNI models with different surface orientations with respect to the axis of competing interactions is investigated. Special attention is thereby paid to the surface criticality at the bulk uniaxial Lifshitz point encountered in this model. The presented Monte Carlo results show that the mean-field description of semi-infinite ANNNI models is qualitatively correct. Lifshitz point surface critical exponents at the ordinary transition are found to depend on the surface orientation. At the special transition point, however, no clear dependency of the critical exponents on the surface orientation is revealed. The values of the surface critical exponents presented in this study are the first estimates available beyond mean-field theory.
description: 10 pages, 7 figures included
Das kristallinische Gebirge am Donaurand des bayerischen Waldes
Creators: name: Ries, A.
Publisher: name: Acta Albertina Ratisbonensia
Year: 2017

description: Das kristallinische Gebirge am Keilberg. Bei Regensburg erhebt sich das kristallinische Gebirge rasch mit ansehnlichen Höhen aus der südlich vorgelagerten, weiten Ebene des Donautales. Die orografische Grenze zwischen diesem Gebirgsteil und der Donauebene setzt sich einerseits nach Westen hin geradlinig fort in den schroff nach Süden abstürzenden Bergen des weissen Jura nördl. von Schwabelweis, anderseits anfangs östlich, aber nach kurzer Strecke sich südöstlich wendend in den beträchtlichen Höhenrücken des bayerischen Waldes, die wie langgezogene, geradlinige, dunkle Wälle die Donau bis über Deggendorf hinunter auf ihrem Nordufer begleiten. Auf seiner Westseite dagegen grenzt das kristallinische Gebirge zwischen Irlbach und dem Tegernheimer Sommerkeller ohne schärfern Absatz der Bergformen an den Jura. Allerdings hängt letzterer nicht unmittelbar mit dem Urgebirge zusammen; es schieben sich vielmehr zwischen beide, auf eine äusserst schmale Zone zusammengedrängt, noch Ablagerungen des Rotliegenden, der Steinkohlenformation und des Keupers ein.
description: Acta Albertina Ratisbonensia, Bd. 9 (1903): Berichte des Naturwissenschaftlichen (früher zoologisch - mineralogischen) Vereines zu Regensburg IX. Heft für die Jahre 1901 und 1902
Probing galaxy cluster and intra-cluster gas with luminous red galaxies
Creators: name: Gong, Yan
name: Ma, Yin-Zhe
name: Tanimura, Hideki
Publisher: name: arXiv
Year: 2019
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use the cross-correlation between the thermal Sunyaev-Zeldovich (tSZ) signal measured by the Planck satellite and the luminous red galaxy (LRG) samples provided by the SDSS DR7 to study the properties of galaxy cluster and intra-cluster gas. We separate the samples into three redshift bins z_1=(0.16, 0.26), z_2=(0.26, 0.36), z_3=(0.36, 0.47), and stack the Planck y-map against LRGs to derive the averaged y-profile for each redshift bin. We then fit the stacked profile with the theoretical prediction from the universal pressure profile (UPP) by using the Markov-Chain Monte-Carlo method. We find that the best-fit values of the UPP parameters for the three bins are generally consistent with the previous studies, except for the noticeable evolution of the parameters in the three redshift bins. We simultaneously fit the data in the three redshift bins together, and find that the original UPP model cannot fit the data at small angular scales very well in the first and third redshift bins. The joint fits can be improved by including an additional parameter eta to change the redshift-dependence of the model (i.e. E(z)^{8/3} -> E(z)^{8/3+eta}) with best-fit value as eta=-3.11^{+1.09}_{-1.13}. This suggests that the original UPP model with less redshift-dependence may provide a better fit to the stacked thermal Sunyaev-Zeldovich profile.
description: 14 pages, 10 figures, 1 table, accepted for publication in MNRAS
Nonadiabatic dynamics in semiquantal physics
Creators: name: Porter, Mason A.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Every physical regime is some sort of approximation of reality. One lesser-known realm that is the semiquantal regime, which may be used to describe systems with both classical and quantum subcomponents. In the present review, we discuss nonadiabatic dynamics in the semiquantal regime. Our primary concern is electronic-nuclear coupling in polyatomic molecules, but we discuss several other situations as well. We begin our presentation by formulating the semiquantal approximation in quantum systems with degrees-of-freedom that evolve at different speeds. We discuss nonadiabatic phenomena, focusing on their relation to the Born-Oppenheimer approximation. We present several examples--including Jahn-Teller distortion in molecules and crystals and the dynamics of solvated electrons, buckyballs, nanotubes, atoms in a resonant cavity, SQUIDs, quantum particle-spin systems, and micromasers. We also highlight vibrating quantum billiards as a useful abstraction of semiquantal dynamics.
description: 58 pages, 0 figures. To appear in Reports on Progress in Physics
Analytical solutions for the dynamical clock A+ indicator in a toy model of pure dynamical friction
Creators: name: Pasquato, Mario
Publisher: name: arXiv
Year: 2019
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Blue straggler stars are more massive than the average star in globular clusters, as they originate from the merger of two stars. Consequently, they experience dynamical friction, progressively sinking to the cluster center. Recently, several indicators of the degree of dynamical relaxation of a globular cluster have been proposed, based on the observed radial distribution of blue straggler stars. The most successful is the Alessandrini indicator, or A+ for short, which is the integral of the cumulative distribution of the blue straggler stars minus that of a lighter reference population. A+ correlates with the dynamical age of a cluster both in realistic simulations and in observations. Here I calculate the temporal dependence of the A+ indicator analytically in a simplified model of the evolution of the blue straggler star distribution under dynamical friction only.
description: No figures, Submitted to RevMexAA