cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Feshbach projection-operator formalism to resonance scattering on Bargmann-type potentials
Creators: name: Shamshutdinova, Varvara V.
name: Pichugin, Konstantin N.
name: Rotter, Ingrid
name: Samsonov, Boris F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The projection-operator formalism of Feshbach is applied to resonance scattering in a single-channel case. The method is based on the division of the full function space into two segments, internal (localized) and external (infinitely extended). The spectroscopic information on the resonances is obtained from the non-Hermitian effective Hamilton operator $H_{\rm eff}$ appearing in the internal part due to the coupling to the external part. As well known, additional so-called cut-off poles of the $S$-matrix appear, generally, due to the truncation of the potential. We study the question of spurious $S$ matrix poles in the framework of the Feshbach formalism. The numerical analysis is performed for exactly solvable potentials with a finite number of resonance states. These potentials represent a generalization of Bargmann-type potentials to accept resonance states. Our calculations demonstrate that the poles of the $S$ matrix obtained by using the Feshbach projection-operator formalism coincide with both the complex energies of the physical resonances and the cut-off poles of the $S$-matrix.
description: 12 pages, 9 figures
An evaluation of CP Rail’s proposed Beaver Tunnel
Creators: name: Friesen, Ted John
Publisher: name: University of British Columbia
Year: 2010

description: CP Rail is experiencing capacity constraints on its western mainline between Calgary, Alberta and Vancouver, B.C. The critical bottleneck has been identified as the Roger's Pass section, which is between Golden, B.C. and Revelstoke, B.C. CP Rail has examined several alternatives, and has concluded that this bottleneck can best be overcome by nineteen miles of doubletracking. This would require the construction of an eight-Mile tunnel under Roger's Pass. CP Rail's financial evaluation of this project reveals an unacceptably low rate of return on capital invested. This paper has two objectives, namely 1) to examine the potential conflict between the public desirability of the tunnel investment and the financial viability of the investment, and 2) regardless of the outcome of the first objective, to identify and analyze alternative methods of providing financial compensation to CP Rail so that it will proceed with the tunnel investment. The analysis concludes that potential benefits brought on by the construction of the tunnel may make this project desirable from a public point of view, even if it is established that the tunnel is not financially viable to CP Rail. The analysis of the alternative methods of providing financial compensation point out that user pay financing alternatives are preferable from an economic viewpoint, but the analysis concludes that time constraints are such that public financing alternatives are optimal.
Medienpädagogik in der offenen Kinder- und Jugendarbeit
Creators: name: Horak, Olivia
name: Jovanovic- Tesulov, Milanka
name: Damisch, Bernhard
Publisher: name: Medienimpulse
Year: 2014

description: Medienimpulse, Bd. 51 Nr. 2 (2013): 2/2013 - Freizeitpädagogik - Freiwillig, Selbstbestimmt, Selbstorganisiert?
The episodic dust-making Wolf-Rayet star HD 38030 in the Large Magellanic Cloud
Creators: name: Williams, Peredur M.
name: Morrell, Nidia I.
name: Boutsia, Konstantina
name: Massey, Philip
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Mid-infrared photometry of the Wolf-Rayet star HD 38030 in the Large Magellanic Cloud from the NEOWISE-R mission show it to have undergone a dust-formation episode in 2018 and the dust to have cooled in 2019-20. New spectroscopy with the MagE spectrograph on the Magellan I Baade Telescope in 2019 and 2020 show absorption lines attributable to a companion of type near O9.7III-IV. We found a significant shift in the radial velocity of the C IV 5801-12 blend compared with the RVs measured in 1984 and 1993. The results combine to suggest that HD 38030 is a colliding-wind binary having short-lived dust formation episodes, like the Galactic systems WR 140 and WR 19, but at intervals in excess of 20 yr.
description: 8 pages, 6 figures, accepted for publication in the MNRAS
Process Mining for Unstructured Data: Challenges and Research Directions
Creators: name: Koschmider, Agnes
name: Aleknonytė-Resch, Milda
name: Fonger, Frederik
name: Imenkamp, Christian
name: Lepsien, Arvid
name: Apaydin, Kaan
name: Harms, Maximilian
name: Janssen, Dominik
name: Langhammer, Dominic
name: Ziolkowski, Tobias
name: Zisgen, Yorck
Publisher: name: arXiv
Year: 2024
Subjects: subject: Databases (cs.DB)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The application of process mining for unstructured data might significantly elevate novel insights into disciplines where unstructured data is a common data format. To efficiently analyze unstructured data by process mining and to convey confidence into the analysis result, requires bridging multiple challenges. The purpose of this paper is to discuss these challenges, present initial solutions and describe future research directions. We hope that this article lays the foundations for future collaboration on this topic.
Marginal probabilities and point estimation for conditionally specified logistic regression
Creators: name: Miller, Curtis
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Medicine
subject: Neuroscience
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Marine Biology

description: Conditionally specified logistic regression (CSLR) models p binary response variables. It is shown that marginal probabilities can be derived for a CSLR model. We also extend the CSLR model by allowing third order interactions. We apply two versions of CSLR to simulated data and a set of real data, and compare the results to those from other modeling methods.
Überlegungen zur Umsetzung des Berichts „PädagogInnenbildung NEU – Die Zukunft der Pädagogischen Berufe“ im Bereich der Medienpädagogik
Creators: name: Swertz, Christian
Publisher: name: Medienimpulse
Year: 2014

description: Medienimpulse, Bd. 50 Nr. 3 (2012): 3/2012 - PädagogInnenbildung Neu
Lorentzian quantum wells in graphene: the role of shape invariance in zero-energy states trapping
Creators: name: Correa, Francisco
name: Inzunza, Luis
name: Jakubský, Vít
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: Confining Dirac fermions in graphene by electrostatic fields is a challenging task. Electric quantum dots created by a scanning tunneling microscope (STM) tip can trap zero-energy quasi-particles. The Lorentzian quantum well provides a faithful, exactly solvable, approximation to such a potential, hosting zero-energy bound states for certain values of the coupling constant. We show that in this critical configuration, the system can be related to the free particle model by means of a supersymmetric transformation. The revealed shape invariance of the model greatly simplifies the calculation of the zero modes and naturally explains the degeneracy of the zero energy.
An alternative calculation of the Casimir forces between birefringent plates
Creators: name: Philbin, T. G.
name: Leonhardt, U.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Barash has calculated the Casimir forces between parallel birefringent plates with optical axes parallel to the plate boundaries [Izv. Vyssh. Uchebn.\ Zaved., Radiofiz., {\bf 12}, 1637 (1978)]. The interesting new feature of the solution compared to the case of isotropic plates is the existence of a Casimir torque which acts to line up the optical axes if they are not parallel or perpendicular. The forces were found from a calculation of the Helmholtz free energy of the electromagnetic field. Given the length of the calculations in this problem and hopes of an experimental measurement of the torque, it is important to check the results for the Casimir forces by a different method. We provide this check by calculating the electromagnetic stress tensor between the plates and showing that the resulting forces are in agreement with those found by Barash.
description: 7 pages
Marginal probabilities and point estimation for conditionally specified logistic regression
Creators: name: Miller, Curtis
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Medicine
subject: Neuroscience
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Marine Biology

description: Conditionally specified logistic regression (CSLR) models p binary response variables. It is shown that marginal probabilities can be derived for a CSLR model. We also extend the CSLR model by allowing third order interactions. We apply two versions of CSLR to simulated data and a set of real data, and compare the results to those from other modeling methods.
Spectral and Dynamical Properties in Classes of Sparse Networks with Mesoscopic Inhomogeneities
Creators: name: Mitrović, Marija
name: Tadić, Bosiljka
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study structure, eigenvalue spectra and diffusion dynamics in a wide class of networks with subgraphs (modules) at mesoscopic scale. The networks are grown within the model with three parameters controlling the number of modules, their internal structure as scale-free and correlated subgraphs, and the topology of connecting network. Within the exhaustive spectral analysis for both the adjacency matrix and the normalized Laplacian matrix we identify the spectral properties which characterize the mesoscopic structure of sparse cyclic graphs and trees. The minimally connected nodes, clustering, and the average connectivity affect the central part of the spectrum. The number of distinct modules leads to an extra peak at the lower part of the Laplacian spectrum in cyclic graphs. Such a peak does not occur in the case of topologically distinct tree-subgraphs connected on a tree. Whereas the associated eigenvectors remain localized on the subgraphs both in trees and cyclic graphs. We also find a characteristic pattern of periodic localization along the chains on the tree for the eigenvector components associated with the largest eigenvalue equal 2 of the Laplacian. We corroborate the results with simulations of the random walk on several types of networks. Our results for the distribution of return-time of the walk to the origin (autocorrelator) agree well with recent analytical solution for trees, and it appear to be independent on their mesoscopic and global structure. For the cyclic graphs we find new results with twice larger stretching exponent of the tail of the distribution, which is virtually independent on the size of cycles. The modularity and clustering contribute to a power-law decay at short return times.
Medienbildung in der Ausbildung – Gibt's das?
Creators: name: Lahner, Bernhard
Publisher: name: Medienimpulse
Year: 2014

description: Der folgende Beitrag gibt einen knappen Einblick in den Ist-Zustand der Pädagogischen Hochschule für Studierende des Lehramts für allgemeine Sonderschulen im Hinblick auf medienpädagogische Ausbildungs- und Spezialisierungsmöglichkeiten. Dabei wird der zeitliche Umfang über die Maßeinheit des European Credit Transfer and Accumulation Systems (ECTS) analysiert, mit dem vorrangig der zeitliche Aufwand für Ausbildungseinheiten definiert wird, wobei in der Folge die inhaltliche Umsetzung genauer betrachtet wird. Abschließend werden zwei konkrete medienpädagogische Erfahrungen in der konkreten Unterrichtspraxis thematisiert.
description: Medienimpulse, Bd. 50 Nr. 3 (2012): 3/2012 - PädagogInnenbildung Neu
Structure-property relations in polymers from renewable resources
Creators: name: Martino, Lucrezia <1985>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: CHIM/04 Chimica industriale

description: The present research project focuses its attention on the study of structure-property relations in polymers from renewable sources (bio-based polymers) such as polymers microbially produced, i.e. polyhydrohyalkanoates (PHAs) or chemically synthesized using monomers from renewable sources, i.e. polyammide 11 (PA11). By means of a broad spectrum of experimental techniques, the influence of different modifications on bio-based polymers such as blending with other components, copolymerization with different co-monomers and introduction of branching to yield complex architectures have been investigated. 
The present work on PHAs focused on the study of the dependence of polymer properties on both the fermentation process conditions (e.g. bacterial strain and carbon substrate used) and the method adopted to recover PHAs from cells. Furthermore, a solvent-free method using an enzyme and chemicals in an aqueous medium, was developed in order to recover PHAs from cells. Such a method allowed to recover PHA granules in their amorphous state, i.e. in native form useful for specific applications (e.g. paper coating). 
In addition, a commercial PHA was used as polymeric matrix to develop biodegradable and bio-based composites for food packaging applications. Biodegradable, non-toxic, food contact plasticizers and low cost, widely available lignocellulosic fibers (wheat straw fibers) were incorporated in such a polymeric matrix, in order to decrease PHA brittleness and the polymer cost, respectively.
As concerns the study of polyamide 11, both the rheological and the solid-state behavior of PA11 star samples with different arm number and length was studied. Introduction of arms in a polymer molecule allows to modulate melt viscosity behavior which is advantageous for industrial applications. Also, several important solid-state properties, in particular mechanical properties, are affected by the presence of branching.
Given the importance of using ‘green’ synthetic strategies in polymer chemistry, novel poly(-amino esters), synthesized via enzymatic-catalyzed polymerization, have also been investigated in this work.
Videoreflexion 2.0
Creators: name: Hilzensauer, Wolf
Publisher: name: Medienimpulse
Year: 2012

description: Der vorliegenden Artikel beschreibt ein Projekt zur videobasierten Rekonstruktion Subjektiver Theorien über guten Unterricht sowie zur Steigerung der Lehrkompetenz von Studierenden. Dieses Projekt wird ab Herbst 2012 an der Pädagogischen Hochschule Salzburg im Rahmen der Schulpraktischen Studien erprobt und evaluiert. Der Artikel skizziert den theoretischen Hintergrund sowie das didaktische Konzept des Projektes und geht dabei speziell auf die Bedeutung von Subjektiven Theorien für den Lehrberuf ein.
description: Medienimpulse, Bd. 50 Nr. 3 (2012): 3/2012 - PädagogInnenbildung Neu
Catalysts and processes for next-generation H2 production
Creators: name: Mafessanti, Rodolfo <1986>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: CHIM/04 Chimica industriale

description: The present study is focused on the development of new VIII group metal on CeO2 – ZrO2 (CZO) catalyst to be used in reforming reaction for syngas production. The catalyst are tested in the oxyreforming process, extensively studied by Barbera [44] in a new multistep process configuration, with intermediate H2 membrane separation, that can be carried out at lower temperature (750°C) with respect  the reforming processes (900 – 1000°C). In spite of the milder temperatures, the oxy-reforming conditions (S/C = 0.7; O2/C = 0.21) remain critical regarding the deactivation problems mainly deriving from thermal sintering and carbon formation phenomena. The combination of the high thermal stability characterizing the ZrO2, with the CeO2 redox properties, allows the formation of stable mixed oxide system with high oxygen mobility. This feature can be exploited in order to contrast the carbon deposition on the active metal surface through the oxidation of the carbon by means of the mobile oxygen atoms available at the surface of the CZO support. Ce0.5Zr0.5O2 is the phase claimed to have the highest oxygen mobility but its formation is difficult through classical synthesis (co-precipitation), hence a water-in-oil microemulsion method is, widely studied and characterized. Two methods (IWI and bulk) for the insertion of the active metal (Rh, Ru, Ni) are followed and their effects, mainly related to the metal stability and dispersion on the support, are discussed, correlating the characterization with the catalytic activity. Different parameters (calcination and reduction temperatures) are tuned to obtain the best catalytic system both in terms of activity and stability. Interesting results are obtained with impregnated and bulk catalysts, the latter representing a new class of catalysts. The best catalysts are also tested in a low temperature (350 – 500°C) steam reforming process and preliminary tests with H2 membrane separation have been also carried out.
Spin relaxation of localized electrons in n-type semiconductors
Creators: name: Kavokin, K. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The mechanisms that determine spin relaxation times of localized electrons in impurity bands of n-type semiconductors are considered theoretically and compared with available experimental data. The relaxation time of the non-equilibrium angular momentum is shown to be limited either by hyperfine interaction, or by spin-orbit interaction in course of exchange-induced spin diffusion. The energy relaxation time in the spin system is governed by phonon-assisted hops within pairs of donors with an optimal distance of about 4 Bohr radii. The spin correlation time of the donor-bound electron is determined either by exchange interaction with other localized electrons, or by spin-flip scattering of free conduction-band electrons. A possibility of optical cooling of the spin system of localized electrons is discussed.
description: Submitted to the special issue "Optical Orientation", Semiconductor Science and Technology
Kleiner Leitfaden zur Erstellung und Nutzung von Audio- und Videoproduktionen im Internet
Creators: name: Samer, Siegfried
Publisher: name: Medienimpulse
Year: 2012

description: Medienimpulse, Bd. 50 Nr. 3 (2012): 3/2012 - PädagogInnenbildung Neu
Regulation of Algorithmic Collusion
Creators: name: Hartline, Jason D.
name: Long, Sheng
name: Zhang, Chenhao
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Theoretical Economics (econ.TH)
subject: FOS: Computer and information sciences
subject: FOS: Economics and business

description: Consider sellers in a competitive market that use algorithms to adapt their prices from data that they collect. In such a context it is plausible that algorithms could arrive at prices that are higher than the competitive prices and this may benefit sellers at the expense of consumers (i.e., the buyers in the market). This paper gives a definition of plausible algorithmic non-collusion for pricing algorithms. The definition allows a regulator to empirically audit algorithms by applying a statistical test to the data that they collect. Algorithms that are good, i.e., approximately optimize prices to market conditions, can be augmented to contain the data sufficient to pass the audit. Algorithms that have colluded on, e.g., supra-competitive prices cannot pass the audit. The definition allows sellers to possess useful side information that may be correlated with supply and demand and could affect the prices used by good algorithms. The paper provides an analysis of the statistical complexity of such an audit, i.e., how much data is sufficient for the test of non-collusion to be accurate.
Film-Bildung im Zeichen des Fremden. Ein bildungstheoretischer Beitrag zur Filmpädagogik
Creators: name: Sutanto, Philipp
Publisher: name: Medienimpulse
Year: 2012

description: Medienimpulse, Bd. 50 Nr. 3 (2012): 3/2012 - PädagogInnenbildung Neu
Delta Scuti Variables
Creators: name: Handler, Gerald
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We review recent research on Delta Scuti stars from an observer's viewpoint. First, some signposts helping to lead the way through the Delta Scuti jungle are placed. Then, some problems in studying individual pulsators in the framework of asteroseismology are given before a view on how the study of these variables has benefited (or not) from past and present high-precision asteroseismic space missions is presented. Some possible pitfalls in the analysis of data with a large dynamical range in pulsational amplitudes are pointed out, and a strategy to optimize the outcome of asteroseismic studies of Delta Scuti stars is suggested. We continue with some views on "hybrid" pulsators and interesting individual High Amplitude Delta Scuti stars, and then take a look on Delta Scuti stars in stellar systems of several different kinds. Recent results on pre-main sequence Delta Scuti stars are discussed as are questions related to the instability strip of these variables. Finally, some remarkable new theoretical results are highlighted before, instead of a set of classical conclusions, questions to be solved in the future, are raised.
description: 7 pages, 1 figure, Proceedings of the International Conference "Stellar Pulsation: Challenges for Observation and Theory", eds. J. A. Guzik & P. A. Bradley
Positron elastic scattering by a semifilled-shell atom
Creators: name: Amusia, M. Ya.
name: Dolmatov, V. K.
name: Chernysheva, L. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We theoretically study the positron elastic scattering by an atom with a multielectron semifilled subshell in its structure. The positron scattering by the Mn($...3d^{5}4s^{2}$,$^{6}S)$ atom with a $3d^{5}$ semifilled subshell ($e^{+}+Mn$ scattering) is chosen as a case study. We account for both the electron correlation and the formation of a $e^{+}+e^{-}$ virtual positronium (Ps) in the intermediate states of the $e^{+}+Mn$ system. Electron correlation is taken into account in the framework of the self-energy part of the scattering positron Green function generalized for the application to semifilled-shell atoms. The influence of the virtual Ps formation on $e^{+}+Mn$ scattering is taken into account by the reduction of the energy of the virtual \textit{positron plus atomic-excited-configuration} states by the Ps-binding energy, to a reasonable approximation. We unravel the importance and specificity of the influence of both the virtual Ps and electron correlation on $e^{+}+Mn$ elastic scattering. We demonstrate spectacular differences between the electron and positron scattering processes.
description: 9 pages, 8 figures
Editorial 3/2013: Visuelle Historiografien. Comics zwischen Reflexion und Konstruktion von Geschichte(n)
Creators: name: Ballhausen, Thomas
name: Horvatic, Eva
Publisher: name: Medienimpulse
Year: 2013

description: Medienimpulse, Bd. 51 Nr. 3 (2013): 3/2013 - Visuelle Historiografien/Comics zwischen Reflexion und Konstruktion von Geschichte(n)
Point-occurrence self-similarity in crackling-noise systems and in other complex systems
Creators: name: Corral, Alvaro
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: It has been recently found that a number of systems displaying crackling noise also show a remarkable behavior regarding the temporal occurrence of successive events versus their size: a scaling law for the probability distributions of waiting times as a function of a minimum size is fulfilled, signaling the existence on those systems of self-similarity in time-size. This property is also present in some non-crackling systems. Here, the uncommon character of the scaling law is illustrated with simple marked renewal processes, built by definition with no correlations. Whereas processes with a finite mean waiting time do not fulfill a scaling law in general and tend towards a Poisson process in the limit of very high sizes, processes without a finite mean tend to another class of distributions, characterized by double power-law waiting-time densities. This is somehow reminiscent of the generalized central limit theorem. A model with short-range correlations is not able to escape from the attraction of those limit distributions. A discussion on open problems in the modeling of these properties is provided.
description: Submitted to J. Stat. Mech. for the proceedings of UPON 2008 (Lyon), topic: crackling noise
Pädagogische Medienproduktionen - der erste Schritt in die illegalität?
Creators: name: Berger, Christian
Publisher: name: Medienimpulse
Year: 2013

description: Die Auswirkungen des Urheberrechts auf den Bildungsbereich werden bei dessen Novellierung voraussichtlich abermals nur am Rande berücksichtigt. Das Schulbuch bleibt geschützt; die nicht kommerzielle Eigenproduktion wird weiterhin erschwert.
description: Medienimpulse, Bd. 50 Nr. 4 (2012): 4/2012 - Soziale und Mediale Räume
Covid-19 treatment approaches
Creators: name: Riefaie, Elham
Year: 2020

description: The sudden outbreak of the ongoing COVID-19 pandemic lead to researchers working with rapid speed to prevent the further spread of the virus SARS-CoV-2. As of the 23rd July 2020, 298 treatments and 199 vaccines are under development. This thesis aims to summarize and give an overview of the present pre-clinical research and clinical trials of potential candidates for COVID-19 treatments and vaccines. The required information has been taken from online databases like PubMed, Science, Nature, PNAS and Cell. Papers included were published between December 2019 and July 2020. The current results indicate the most promising outcomes for dexamethasone as a treatment and ChAdOx1 nCoV-19 as a vaccine. Further research is needed to identify safe and effective treatments and vaccines for COVID-19.
description: Der plötzliche Ausbruch der derzeitigen COVID-19-Pandemie führte dazu, dass Forscher mit hoher Geschwindigkeit daran arbeiten, die Ausbreitung des Virus SARS-CoV-2 zu stoppen. Mit Stand vom 23. Juli 2020 befinden sich 298 Behandlungen und 199 Impfstoffe in Entwicklung. Diese Diplomarbeit soll die aktuelle präklinische Forschung und die klinischen Studien zu potenziellen COVID-19-Behandlungen und Impfstoffen zusammenfassen und einen Überblick schaffen. Die erforderlichen Informationen wurden von Online-Datenbanken wie Pubmed, Science, Nature, PNAS und Cell entnommen. Die enthaltenen Publikationen wurden zwischen Dezember 2019 und Juli 2020 veröffentlicht. Die Ergebnisse weisen auf vielversprechende Ergebnisse für Dexamethason als Behandlung und ChAdOx1 nCoV-19 als Impfstoff hin. Weitere Forschung ist erforderlich, um eine sichere und wirksame Behandlung und Impfstoffe gegen COVID-19 zu identifizieren.
Drugs down-regulating E2F-1 expression hinders cell proliferation through a p53-indipendent mechanism
L'inibizione farmacologia di e2f-1 riduce la proliferazione delle cellule tumorali con un meccanismo p53 - indipendente
Creators: name: Pollutri, Daniela <1982>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: MED/05 Patologia clinica

description: E2F-1 is a transcription factor that plays a key role in cell-cycle control at G1/S check-point level by regulating the timely expression of many target genes whose products are required for S phase entry and progression. In mammalian cells, E2F-1 is negatively regulated by hypo-phosphorylated Retinoblastoma protein (pRb) whereas it is protected against degradation  by its  binding to Mouse Double Minute 2 protein (MDM2). In this study we experimented a drug combination in order to obtain a strong down-regulation of E2F-1 by acting on two different mechanisms of E2F-1 regulation mentioned above. This was achieved by combining drugs inhibiting the phosphorylation of pRb with drugs inactivating the MDM2 binding capability. The mechanism of action of these drugs in down-regulating E2F-1 level and activity is p53 independent.  As expected, when combined, these drugs strongly inhibits E2F-1 and hinder cell proliferation in p53-/- and p53-mutated cells by blocking them in G1 phase of cell cycle, suggesting that E2F-1 down-regulation may represent a valid chemotherapeutic approach to inhibit proliferation in tumors independently of p53 status.
Substitutional tin acceptor states in black phosphorus
Creators: name: Wentink, Mark
name: Gaberle, Julian
name: Aghajanian, Martik
name: Mostofi, Arash A.
name: Curson, Neil J.
name: Lischner, Johannes
name: Schofield, Steven R.
name: Shluger, Alexander L.
name: Kenyon, Anthony J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Nominally-pure black phosphorus (BP) is commonly found to be a p-type semiconductor, suggesting the ubiquitious presence of impurity species or intrinsic, charged defects. Moreover, scanning tunnelling microscopy (STM) images of black phosphorus reveal the presence of long-ranged double-lobed defect features superimposed onto the surface atomic lattice. We show that both the p-type doping of BP and the defect features observed in STM images can be attributed to substitutional tin impurities. We show that black phosphorus samples produced through two common synthesis pathways contain tin impurities, and we demonstrate that the ground state of substitutional tin impurities is negatively charged for a wide range of Fermi level positions within the BP bandgap. The localised negative charge of the tin impurities induces hydrogenic states in the bandgap and it is the 2p level that sits at the valence band edge that gives rise to the double-lobed features observed in STM images.
description: 19 pages, 4 figures
KidSmart - Medienkompetent zum Schulübergang
Creators: name: Müller, Anita
name: Marci-Boehncke, Gudrun
name: Rath, Matthias
Publisher: name: Medienimpulse
Year: 2012

description: In Deutschland zeichnet sich bereits vor Schuleintritt im Bereich der literarischen und medialen Sozialisation eine Bildungsbenachteiligung ab. Vor allem Kinder aus bildungsfernen Milieus und mit Migrationshintergrund sind hiervon betroffen (vgl. Becker/Lauterbach 2004; Diefenbach 2007; Rabe-Kleberg 2010). An dieser Einsicht knüpft das Forschungs- und Interventionsprojekt KidSmart – Medienkompetent zum Schulübergang an. Medienpädagogische Arbeit steht hier im Kontext der Vorbereitung auf den Schulübergang. Durch kreative Medienarbeit soll ein Gegengewicht zur eher passiven Mediennutzung geschaffen werden. Ziel ist es Bildungsunterschiede von Kindern bereits vor Schulbeginn auszugleichen.
description: Medienimpulse, Bd. 50 Nr. 1 (2012): 1/2012 - Repräsentation(en) der Shoah
Avoiding entanglement sudden-death via measurement feedback control in a quantum network
Creators: name: Yamamoto, Naoki
name: Nurdin, Hendra I.
name: James, Matthew R.
name: Petersen, Ian R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this paper, we consider a linear quantum network composed of two distantly separated cavities that are connected via a one-way optical field. When one of the cavity is damped and the other is undamped, the overall cavity state obtains a large amount of entanglement in its quadratures. This entanglement however immediately decays and vanishes in a finite time. That is, entanglement sudden-death occurs. We show that the direct measurement feedback method proposed by Wiseman can avoid this entanglement sudden-death, and further, enhance the entanglement. It is also shown that the entangled state under feedback control is robust against signal loss in a realistic detector, indicating the reliability of the proposed direct feedback method in practical situations.
description: 11 pages
Energy-momentum/Cotton tensor duality for AdS4 black holes
Creators: name: Bakas, Ioannis
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider the theory of gravitational quasi-normal modes for general linear perturbations of AdS4 black holes. Special emphasis is placed on the effective Schrodinger problems for axial and polar perturbations that realize supersymmetric partner potential barriers on the half-line. Using the holographic renormalization method, we compute the energy-momentum tensor for perturbations satisfying arbitrary boundary conditions at spatial infinity and discuss some aspects of the problem in the hydrodynamic representation. It is also observed in this general framework that the energy-momentum tensor of black hole perturbations and the energy momentum tensor of the gravitational Chern-Simons action (known as Cotton tensor) exhibit an axial-polar duality with respect to appropriately chosen supersymmetric partner boundary conditions on the effective Schrodinger wave-functions. This correspondence applies to perturbations of very large AdS4 black holes with shear viscosity to entropy density ratio equal to 1/4π, thus providing a dual graviton description of their hydrodynamic modes. We also entertain the idea that the purely dissipative modes of black hole hydrodynamics may admit Ricci flow description in the non-linear regime.
description: 38 pages; minor typos corrected, a few extra references and a note added
Analysis of regular inflationary cosmological models with two torsion functions in Poincare gauge theory of gravity
Creators: name: Garkun, A. S.
name: Kudin, V. I.
name: Minkevich, A. V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Analysis of regular inflationary cosmological models with two torsion functions filled with scalar field with quadratic potential and ultrarelativistic matter is carried out numerically. Properties of different stages of regular inflationary cosmological solutions are studied, restrictions on admissible values of parameters and initial conditions at transition from compression to expansion are found. The structure of extremum surface in space of physical variables is investigated.
description: 13 pages, 16 figures
Quantum Transfer Learning with Adversarial Robustness for Classification of High-Resolution Image Datasets
Creators: name: Khatun, Amena
name: Usman, Muhammad
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The application of quantum machine learning to large-scale high-resolution image datasets is not yet possible due to the limited number of qubits and relatively high level of noise in the current generation of quantum devices. In this work, we address this challenge by proposing a quantum transfer learning (QTL) architecture that integrates quantum variational circuits with a classical machine learning network pre-trained on ImageNet dataset. Through a systematic set of simulations over a variety of image datasets such as Ants & Bees, CIFAR-10, and Road Sign Detection, we demonstrate the superior performance of our QTL approach over classical and quantum machine learning without involving transfer learning. Furthermore, we evaluate the adversarial robustness of QTL architecture with and without adversarial training, confirming that our QTL method is adversarially robust against data manipulation attacks and outperforms classical methods.
Hadron Form Factors in AdS/QCD
Creators: name: Carlson, Carl E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss how to calculate form factors using a holographic model of QCD, mainly focusing on vector, axial, and pseudoscalar mesons. We illustrate the techniques on gravitational form factors (which are useful for constraining the generalized parton distributions) as well as quoting the results for electromagnetic form factors. One striking outcome, comparing the several types of calculated form factors, is that mesons appear noticeably more compact when measured by the gravitational form factors than when measured by the charge form factor.
description: Invited talk at the Eighth International Conference on Hyperons, Charm and Beauty Hadrons (BEACH 2008), Columbia, SC, USA, 22--28 June 2008
Practical schemes for the measurement of angular-momentum covariance matrices in quantum optics
Creators: name: Rivas, Ángel
name: Luis, Alfredo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We develop practical schemes for the measurement of the covariance matrix for intrinsic angular-momentum variables in quantum optics. We particularize this approach to two-beam polarimetry and interferometry, as well as to ensembles of two-level atoms interacting with classical fields. We show the practical advantages of noisy simultaneous measurements.
description: 8 pages, 5 figures. References added and minor changes. Final version
Estimate for the bulk viscosity of strongly coupled quark matter using perturbative QCD and holography
Creators: name: Rojas, Jesús Cruz
name: Gorda, Tyler
name: Hoyos, Carlos
name: Jokela, Niko
name: Järvinen, Matti
name: Kurkela, Aleksi
name: Paatelainen, Risto
name: Säppi, Saga
name: Vuorinen, Aleksi
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Modern hydrodynamic simulations of core-collapse supernovae and neutron-star mergers require knowledge not only of the equilibrium properties of strongly interacting matter, but also of the system's response to perturbations, encoded in various transport coefficients. Using perturbative and holographic tools, we derive here an improved weak-coupling and a new strong-coupling result for the most important transport coefficient of unpaired quark matter, its bulk viscosity. These results are combined in a simple analytic pocket formula for the quantity that is rooted in perturbative Quantum Chromodynamics at high densities but takes into account nonperturbative holographic input at neutron-star densities, where the system is strongly coupled. This expression can be used in the modeling of unpaired quark matter at astrophysically relevant temperatures and densities.
description: Corresponds to the published version. 18 pages, 7 figures
Criteria for dynamic stall onset and vortex shedding in low Reynolds number flows
Creators: name: Sudharsan, Sarasija
name: Sharma, Anupam
Publisher: name: arXiv
Year: 2024
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Dynamic stall at low Reynolds numbers, $\mathit{Re} \sim \mathcal{O}(10^4)$, exhibits complex flow physics with co-existing laminar, transitional, and turbulent flow regions. Current state-of-the-art stall onset criteria use parameters that rely on flow properties integrated around the leading edge. These include the leading edge suction parameter or $\mathit{LESP}$ (Ramesh et al., 2014) and boundary enstrophy flux or $\mathit{BEF}$ (Sudharsan et al., 2022)), which have been found to be effective for stall onset at moderate to high $\mathit{Re}$. However, low $\mathit{Re}$ flows feature strong vortex shedding events occurring across the entire airfoil surface, including regions away from the leading edge, altering the flow field and influencing the onset of stall. In the present work, the ability of these stall criteria to effectively capture and localize these vortex shedding events in space and time is investigated. High-resolution large-eddy simulations for an SD7003 airfoil undergoing a constant-rate, pitch-up motion at two $\mathit{Re}$ (10, 000 and 60, 000) and two pitch rates reveal a rich variety of unsteady flow phenomena, including instabilities, transition, vortex formation, merging, and shedding, which are described in detail. While stall onset is reflected in both $\mathit{LESP}$ and $\mathit{BEF}$, local vortex-shedding events are identified only by the $\mathit{BEF}$. Furthermore, these events can be localized in space and time by considering the contributions to the $\mathit{BEF}$ from different airfoil sections, which holds significant promise for effective flow control.
description: 27 pages, 23 figures, submitted to journal
Pipradrol enhances the effect of conditioned stimuli on behaviour
Creators: name: Hanson, Dale Robert
Publisher: name: University of British Columbia
Year: 2010

description: This thesis examined the effects of the stimulant drug pipradrol on operant responding in the presence of stimuli paired previously with food or shock. The first series of studies replicated previous findings of enhanced acquisition of responding with conditioned reinforcement after treatment with pipradrol, using a different test paradigm. The experiment began with a pre-exposure phase to determine the operant rate of pressing two levers, one of which produced a three second tone; during a conditioning phase, the same three second tone was paired with the delivery of food pellets; in a final test phase, the rates of pressing the two levers were determined again. Conditioned reinforcement was defined as a relative increase in pressing the lever that produced the tone. Pipradrol was shown to produce a dose-dependent enhancement of this effect on lever preference. Subsequent experiments examined the possible role of non-specific stimulus change, feeding in the test environment and prior exposure to the conditioned stimulus, in producing this enhancement. The data suggested that associations involving environmental stimuli may play a role in mediating this effect; animals pre-exposed to the tone stimulus and subsequently fed in the same environment as pre-exposure and test showed evidence of "conditioned reinforcement". Disrupting the relationship between tones in the pre-exposure phase and environmental stimuli paired with food prevented this pattern of responding in drugged animals. Sensory preconditioning was suggested as a possible mechanism for these associations and data were collected that were consistent with this hypothesis. Pipradrol also was shown to enhance "conditioned suppression". In this situation, animals were tested for suppression of ongoing licking behaviour to a stimulus that had been previously classically conditioned to shock. An effect of explicit sensory preconditioning training was demonstrated in this paradigm, however, pipradrol could not be shown to enhance this effect. Implications for current theories of stimulant drug action are discussed.
Multimodal-Enhanced Objectness Learner for Corner Case Detection in Autonomous Driving
Creators: name: Xiao, Lixing
name: Shi, Ruixiao
name: Tang, Xiaoyang
name: Zhou, Yi
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Previous works on object detection have achieved high accuracy in closed-set scenarios, but their performance in open-world scenarios is not satisfactory. One of the challenging open-world problems is corner case detection in autonomous driving. Existing detectors struggle with these cases, relying heavily on visual appearance and exhibiting poor generalization ability. In this paper, we propose a solution by reducing the discrepancy between known and unknown classes and introduce a multimodal-enhanced objectness notion learner. Leveraging both vision-centric and image-text modalities, our semi-supervised learning framework imparts objectness knowledge to the student model, enabling class-aware detection. Our approach, Multimodal-Enhanced Objectness Learner (MENOL) for Corner Case Detection, significantly improves recall for novel classes with lower training costs. By achieving a 76.6% mAR-corner and 79.8% mAR-agnostic on the CODA-val dataset with just 5100 labeled training images, MENOL outperforms the baseline ORE by 71.3% and 60.6%, respectively. The code will be available at https://github.com/tryhiseyyysum/MENOL.
description: Accepted to 2024 IEEE International Conference on Image Processing (ICIP) as oral presentation
Quantum corrections to energy of short spinning string in AdS5
Creators: name: Tirziu, A.
name: Tseytlin, A. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Motivated by desire to shed light on the strong coupling behaviour of anomalous dimensions of "short" gauge theory operators we consider the famous example of folded spinning string in AdS_5 in the limit of small semiclassical spin parameter §= S/sqrt[lambda]. In this limit the string becomes short and is moving in a near-flat central region of AdS_5. Its energy scales with spin as E = sqrt[2 S] [ a_0 + a_1 S + a_2 S^2 + ...]. We explicitly compute the leading 1-loop quantum AdS_5 x S^5 superstring corrections to the short-string limit coefficients a_0 and a_1 and show, in particular, that a_1 receives a contribution containing ζ(3).
description: 27 pages; v2: comments and appendix B about regularization ambiguity added; v3,4: minor corrections; v5: treatment of fermionic contribution corrected, a new appendix and a note added