cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The establishment of a flow cytometry system to study HTT regulation and expression
Creators: name: Kosior, Natalia Athina
Publisher: name: University of British Columbia
Year: 2017

description: Huntington’s disease (HD) is a late-onset neurodegenerative disorder characterized by motor deficits, behavioral abnormalities and psychiatric symptoms. HD is caused by a CAG trinucleotide repeat expansion in the HTT gene resulting in expression of a mutant polyglutamine stretch in the huntingtin protein. HD affects up to 14 per 100,000 people in British Columbia. This devastating disorder is characterized by relatively selective neuronal loss in the caudate and putamen, regions of the brain referred to collectively as the striatum. Numerous mechanisms leading to this selective neurodegeneration have been proposed but the pathways involved are still not well understood. The huntingtin protein (HTT) is ubiquitously expressed, meaning that it is present in all cell types in the central nervous system, prompting investigations into potential pathogenic mechanisms outside of the characteristic neuronal loss. The brain is composed of microglia and astrocyte cell populations that together, make up the central immune system. Immune system activation has been implicated in the disease pathogenesis of various neurodegenerative diseases, including HD. The purpose of this thesis was to establish a flow cytometry system to investigate potential HTT regulatory mechanisms as well as increase knowledge of immune cell dysfunction in HD. Following the establishment of the flow cytometry system I found that HTT expression does not vary across the cell cycle. Using an adapted technique, I identified robust but not absolute genetic knock-down in two microglia-specicfic conditional knock out mouse models. Adding to the neuroinflammation focus, I identified mutant-huntingtin specific changes in protein phosphorylation expression in microglia as a means of identifying potential signaling cascades involved in exaggerated cytokine release. Lastly, I investigated transcriptional dysregulation in HD microglia and astrocyte populations and the effect of a candidate therapeutic on gene expression in these cell types. My research provides additional insight into potential protein phosphorylation and genetic pathways involved in immune dysfunction in HD and will focus future experiments aimed at understanding the role of central inflammation in HD.
Generalized Geologic Map for Land-Use Planning: Letcher County, Kentucky
Creators: name: Carey, Daniel I.
name: Webb, Steven E.
name: Davidson, Bart
Publisher: name: Kentucky Geological Survey, University of Kentucky
Year: 2007

description: Abstract:
This map is not intended to be used for selecting individual sites. Its purpose is to inform land-use planners, government officials, and the public in a general way about geologic bedrock conditions that affect the selection of sites for various purposes. The properties of thick soils may supercede those of the underlying bedrock and should be considered on a site-to-site basis. At any site, it is important to understand the characteristics of both the soils and the underlying rock.
Long exciton in stacking-fault-free wurtztite GaAs nanowires
Creators: name: Furthmeier, Stephan
name: Dirnberger, Florian
name: Hubmann, Joachim
name: Bauer, Benedikt
name: Korn, Tobias
name: Schüller, Christian
name: Zweck, Josef
name: Reiger, Elisabeth
name: Bougeard, Dominique
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: We present a combined photoluminescence and transmission electron microscopy study of single GaAs nanowires. Each wire was characterized both in microscopy and spectroscopy, allowing a direct correlation of the optical and the structural properties. By tuning the growth parameters, the nanowire crystal structure is optimized from a highly mixed zincblende–wurtzite structure to pure wurtzite. We find the latter one to be stacking-fault-free over nanowire lengths up to 4.1 μm. We observe the emission of purely wurtzite nanowires to occur only with polarization directions perpendicular to the wurtzite cˆ -axis, as expected from the hexagonal unit cell symmetry. The free exciton recombination energy in the wurtzite structure is 1.518 eV at 5 K with a narrow linewidth of 4 meV. Most notably, these pure wurtzite nanowires display long carrier recombination lifetimes of up to 11.2 ns, exceeding reported lifetimes in bulk GaAs and state-of-the-art 2D GaAs/AlGaAs heterostructures.
Effective one body Hamiltonian of two spinning black-holes with next-to-next-to-leading order spin-orbit coupling
Creators: name: Nagar, Alessandro
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Building on the recently computed next-to-next-to-leading order (NNLO) post-Newtonian (PN) spin-orbit Hamiltonian for spinning binaries \cite{Hartung:2011te} we extend the effective-one-body (EOB) description of the dynamics of two spinning black-holes to NNLO in the spin-orbit interaction. The calculation that is presented extends to NNLO the next-to-leading order (NLO) spin-orbit Hamiltonian computed in Ref. \cite{Damour:2008qf}. The present EOB Hamiltonian reproduces the spin-orbit coupling through NNLO in the test-particle limit case. In addition, in the case of spins parallel or antiparallel to the orbital angular momentum, when circular orbits exist, we find that the inclusion of NNLO spin-orbit terms moderates the effect of the NLO spin-orbit coupling.
description: 11 pages, no figures. Corrected typographical errors in Eqs.(43) and (55). Erratum submitted to PRD
The Cost of Going Green: Environmental Gentrification and Community Resistance in New York City and Chicago
Creators: name: Redfern-Taube, Ro
Publisher: name: University of Chicago
Year: 2022

description: Environmental or “green” gentrification, a concept which has recently been named in environmental justice literature, is the process by which public initiatives intended to improve the environmental conditions or sustainability of a given area ultimately drive the displacement of low-income residents. Environmental gentrification may arise as an unfortunate and unintended consequence of environmental projects, or such projects may be intentionally used by city planners and high-end developers as a means of boosting property values or furthering other economic goals. This paper seeks to identify which strategies are effective in community organizing around mitigating gentrification and displacement risks in the face of urban environmental initiatives, and whether similar strategies can be applied across cities. These questions are answered through a series of interviews with members of community-based organizations (CBOs), employees of City agencies, local officials, and neighborhood residents involved with public action surrounding the East Side Coastal Resiliency Project (ESCR) in New York City and the 606 Bike Trail in Chicago. Findings indicate that the construction of new green space amenities – or improvements upon old ones – must be recognized as potential catalysts for gentrification, and communities and Cities together must take action preemptively to protect existing residents from the pressures of gentrification and neighborhood change.
Supersymmetry and PT-Symmetric Spectral Bifurcation
Creators: name: Abhinav, Kumar
name: Panigrahi, Prasanta K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Dynamical systems exhibiting both PT and Supersymmetry are analyzed in a general scenario. It is found that, in an appropriate parameter domain, the ground state may or may not respect PT-symmetry. Interestingly, in the domain where PT-symmetry is not respected, two superpotentials give rise to one potential; whereas when the ground state respects PT, this correspondence is unique. In both scenarios, supersymmetry and shape-invariance are intact, through which one can obtain eigenfunctions and eigenstates exactly. Our procedure enables one to generate a host of complex potentials which are not PT-symmetric, and can be exactly solved.
description: 9 pages
Trilepton Signals in the Inert Doublet Model
Creators: name: Miao, Xinyu
name: Su, Shufang
name: Thomas, Brooks
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this work, we investigate the prospects for detecting the Inert Doublet Model via the trilepton channel at the LHC. We present a set of representative benchmark scenarios in which all applicable constraints are satisfied, and show that in some of these scenarios, it is possible to obtain a signal at the 5 sigma significance level or better with integrated luminosity of 300 fb^{-1}.
description: 15 pages, ReVTeX, 3 figures, 5 tables.
Current-induced spin polarization and the spin Hall effect: A quasiclassical approach
Creators: name: Raimondi, Roberto
name: Gorini, Cosimo
name: Dzierzawa, Michael
name: Schwab, Peter
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: Spin Hall effect; Spin–orbit coupling; Spintronics
subject: 530 Physik

description: The quasiclassical Green function formalism is used to describe charge and spin dynamics in the presence of spin–orbit coupling. We review the results obtained for the spin Hall effect on restricted geometries. The role of boundaries is discussed in the framework of spin diffusion equations.
Eisenstein Series on Loop Groups
Creators: name: Liu, Dongwen
Publisher: name: arXiv
Year: 2011
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: Based on Garland's work, in this paper we construct the Eisenstein series on the adelic loop groups over a number field, induced from either a cusp form or a quasi-character which is assumed to be unramified. We compute the constant terms, prove their absolute and uniform convergence under the affine analog of Godement's criterion. For the case of quasi-characters the resulting formula is an affine Gindikin-Karpelevich formula. Then we prove the convergence of Eisenstein series themselves in certain analogs of Siegel subsets.
description: To appear in Transactions of the AMS
On Ilyashenko's Statistical Attractors
Creators: name: Catsigeras, Eleonora
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37A05, 28D05, 37B20, 37B25

description: We define a minimal alpha-observability of Ilyashenko's statistical attractors. We prove that the space is always full Lebesgue decomposable into pairwise disjoint sets that are Lebesgue-bounded away from zero and included in the basins of a finite family of minimal alpha-observable statistical attractors. Among other examples, we analyze the Bowen homeomorphisms with non robust topological heteroclinic cycles. We prove the existence of three types of statistical behaviours for these examples.
description: This version has changes suggested by the anonymous referee. Accepted for publication in "Dynamical Systems - An International Journal". The final version will appear in http://www.tandfonline.com/toc/cdss20/current#.UikiPX96-ME
Spin relaxation in narrow wires of a two-dimensional electron gas
Creators: name: Schwab, Peter
name: Dzierzawa, Michael
name: Gorini, Cosimo
name: Raimondi, Roberto
Publisher: name: Universität Regensburg
Year: 2006
Subjects: subject: 530 Physik

description: How does an initially homogeneous spin polarization in a confined two-dimensional electron gas with Rashba spin-orbit coupling evolve in time? How does the relaxation time depend on system size? We study these questions for systems of a size that is much larger than the Fermi wavelength, but comparable and even shorter than the spin relaxation length. Depending on the confinement spin relaxation may become faster or slower than in the bulk. An initially homogeneously polarized spin system evolves into a spiral pattern.
Examples of coarse expanding conformal maps
Creators: name: Haissinsky, Peter
name: Pilgrim, Kevin M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: In previous work, a class of noninvertible topological dynamical systems $f: X \to X$ was introduced and studied; we called these {\em topologically coarse expanding conformal} systems. To such a system is naturally associated a preferred quasisymmetry (indeed, snowflake) class of metrics in which arbitrary iterates distort roundness and ratios of diameters by controlled amounts; we called this {\em metrically coarse expanding conformal}. In this note we extend the class of examples to several more familiar settings, give applications of our general methods, and discuss implications for the computation of conformal dimension.
Spin polarizations and spin Hall currents in a two-dimensional electron gas with magnetic impurities
Creators: name: Gorini, Cosimo
name: Schwab, Peter
name: Dzierzawa, Michael
name: Raimondi, Roberto
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: 530 Physik

description: We consider a two-dimensional electron gas in the presence of Rashba spin-orbit coupling, and study the effects of magnetic s-wave and long-range nonmagnetic impurities on the spin-charge dynamics of the system. We focus on voltage induced spin polarizations and their relation to spin Hall currents. Our results are obtained using the quasiclassical Green function technique, and hold in the full range of the disorder parameter αpFτ.
Relevancia de la evaluación psicofisiológica en Sexología: una década de LabSex UGR
Creators: name: Álvarez-Muelas, Ana
name: Sierra, Juan Carlos
Publisher: name: Zenodo
Year: 2023
Subjects: sexología
evaluación psicológica
investigación

description: Presentación titulada "Relevancia de la evaluación psicofisiológica en Sexología: una década de LabSex UGR" que forma parte de la mesa invitada "Evaluación psicológica en la sexología; una perspectiva desde la investigación" en el XVI Congreso Español y Euroamericano de Sexología.
Influence of distortions of key frames on video transfer in wireless networks
Creators: name: Sagatov, E. S.
name: Sukhov, A. M.
name: Calyam, P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences
subject: H.4.3; C.2.1; C.2.5

description: In this paper it is shown that for substantial increase of video quality in wireless network it is necessary to execute two obligatory points on modernization of the communication scheme. The player on the received part should throw back automatically duplicated RTP packets, server of streaming video should duplicate the packets containing the information of key frames. Coefficients of the mathematical model describing video quality in wireless network have been found for WiFi and 3G standards and codecs MPEG-2 and MPEG-4 (DivX). The special experimental technique which has allowed collecting and processing the data has been developed for calculation of values of factors.
description: 6 pages, 4 figures, 2 Tables
Hole-spin Dynamics and hole g-factor anisotropy in coupled quantum well systems
Creators: name: Gradl, C.
name: Kempf, M.
name: Schuh, Dieter
name: Bougeard, Dominique
name: Winkler, R.
name: Schüller, Christian
name: Korn, Tobias
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: Due to its p-like character, the valence band in GaAs-based heterostructures offers rich and complex spin-dependent phenomena. One manifestation is the large anisotropy of Zeeman spin splitting. Using undoped, coupled quantum wells (QWs), we examine this anisotropy by comparing the hole-spin dynamics for high- and low-symmetry crystallographic orientations of the QWs. We directly measure the hole g factor via time-resolved Kerr rotation, and for the low-symmetry crystallographic orientations (110) and (113a), we observe a large in-plane anisotropy of the hole g factor, in good agreement with our theoretical calculations. Using resonant spin amplification, we also observe an anisotropy of the hole-spin dephasing in the (110)-grown structure, indicating that crystal symmetry may be used to control hole-spin dynamics.
On the epistemic potential of virtual realities for the historical sciences. A methodological framework
Creators: name: Weinzierl, Stefan
name: Lepa, Steffen
Publisher: name: Technische Universität Berlin
Year: 2017
Subjects: subject: 004 Datenverarbeitung; Informatik
subject: 300 Sozialwissenschaften
subject: 100 Philosophie und Psychologie
subject: virtual reality
subject: augmented reality
subject: virtual acoustic reality
subject: virtual historic environment
subject: virtual archaeology
subject: cyber ethnography

description: Virtual or augmented audio-visual environments can be employed not only for the impartment of knowledge to a wider audience, but also for the generation of knowledge within the historical sciences. In this context, the transformation of numerical models of historical circumstances into an immediate sensual experience may be used both in an exploratory manner as well as for testing specific hypotheses through subjective perceptual analysis. As with any other empirical approach, the new insights provided can be biased on different levels. In order to make virtual realities (VRs) a valuable tool for research, traditional quality criteria for empirical research need to be adapted to the specific setting created by observational fieldwork ‘within’ 3D audio-visual computer simulations. Two major causes for degradation in the credibility of VR-based historical research are related to the relationship between simulation and historical ‘reality’ as well as to the human agents experiencing the simulated environments and the conclusions drawn from their subjective impressions. Hence, our contribution attempts to outline procedures and methods for estimating and comparing the ecological validity of virtual environments as well as the level of intersubjectivity regarding the inferences drawn during and after experiencing them. For this purpose, we suggest to synthesize existing ideas and procedures originating from virtual reality research, media psychology, communication science and ethnology.
Pyrococcus furiosus flagella: biochemical and transcriptional analyses identify the newly detected flaB0 gene to encode the major flagellin
Creators: name: Bellack, Annett
name: Näther-Schindler, Daniela J.
name: Schopf, Simone
name: Rachel, Reinhard
name: Wirth, Reinhard
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: Archaeal flagella, Pyrococcus furiosus, Fla proteins, Major flagellin, FlaB0, transcriptional analyses
subject: 570 Biowissenschaften, Biologie

description: We have described previously that the flagella of the Euryarchaeon Pyrococcus furiosus are multifunctional cell appendages used for swimming, adhesion to surfaces and formation of cell-cell connections. Here, we characterize these organelles with respect to their biochemistry and transcription. Flagella were purified by shearing from cells followed by CsCl-gradient centrifugation and were found to consist mainly of a ca. 30 kDa glycoprotein. Polymerization studies of denatured flagella resulted in an ATP-independent formation of flagella-like filaments. N-terminal sequencing of the main flagellin revealed an unexpected N-terminus. Therefore, we resequenced the respective region of the genome, thereby discovering that the published genome sequence is not correct. A total of 771 bp are missing in the data base, resulting in the fact that a total of three flagellin genes are present. To keep in line with the earlier nomenclature we call these flaB0, flaB1, and flaB2. Very interestingly, the previously not identified flaB0 codes for the major flagellin. Transcriptional analyses of the newly defined flagellar operon identified various different transcripts depending on the growth phase.
Spectral statistics of Erdős-Rényi graphs I: Local semicircle law
Creators: name: Erdős, László
name: Knowles, Antti
name: Yau, Horng-Tzer
name: Yin, Jun
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider the ensemble of adjacency matrices of Erdős-Rényi random graphs, that is, graphs on $N$ vertices where every edge is chosen independently and with probability $p\equiv p(N)$. We rescale the matrix so that its bulk eigenvalues are of order one. We prove that, as long as $pN\to\infty$ (with a speed at least logarithmic in $N$), the density of eigenvalues of the Erdős-Rényi ensemble is given by the Wigner semicircle law for spectral windows of length larger than $N^{-1}$ (up to logarithmic corrections). As a consequence, all eigenvectors are proved to be completely delocalized in the sense that the $\ell^{\infty}$-norms of the $\ell^2$-normalized eigenvectors are at most of order $N^{-1/2}$ with a very high probability. The estimates in this paper will be used in the companion paper [Spectral statistics of Erdős-Rényi graphs II: Eigenvalue spacing and the extreme eigenvalues (2011) Preprint] to prove the universality of eigenvalue distributions both in the bulk and at the spectral edges under the further restriction that $pN\gg N^{2/3}$.
description: Published in at http://dx.doi.org/10.1214/11-AOP734 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
First synthesis of naphthalene annulated oxepins
Creators: name: Dobelmann, Lars
name: Parham, A. H.
name: Büsing, A.
name: Buchholz, H.
name: König, Burkhard
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 540 Chemie

description: Highly condensed oxepins have been prepared in good yields from their corresponding diols by etherification using p-toluenesulfonic acid. Their intriguing twisted structures were unambiguously determined by X-ray crystallography. Substitution effects of a novel highly aromatic naphthalene annulated oxepin indicate that structural and conjugative effects have an influence on the optoelectronic properties.
description: Open-Access-Komponente aus der Allianzlizenz
Decay of tails at equilibrium for FIFO join the shortest queue networks
Creators: name: Bramson, Maury
name: Lu, Yi
name: Prabhakar, Balaji
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Performance (cs.PF)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: In join the shortest queue networks, incoming jobs are assigned to the shortest queue from among a randomly chosen subset of $D$ queues, in a system of $N$ queues; after completion of service at its queue, a job leaves the network. We also assume that jobs arrive into the system according to a rate-$αN$ Poisson process, $α<1$, with rate-1 service at each queue. When the service at queues is exponentially distributed, it was shown in Vvedenskaya et al. [Probl. Inf. Transm. 32 (1996) 15-29] that the tail of the equilibrium queue size decays doubly exponentially in the limit as $N\rightarrow\infty$. This is a substantial improvement over the case D=1, where the queue size decays exponentially. The reasoning in [Probl. Inf. Transm. 32 (1996) 15-29] does not easily generalize to jobs with nonexponential service time distributions. A modularized program for treating general service time distributions was introduced in Bramson et al. [In Proc. ACM SIGMETRICS (2010) 275-286]. The program relies on an ansatz that asserts, in equilibrium, any fixed number of queues become independent of one another as $N\rightarrow\infty$. This ansatz was demonstrated in several settings in Bramson et al. [Queueing Syst. 71 (2012) 247-292], including for networks where the service discipline is FIFO and the service time distribution has a decreasing hazard rate. In this article, we investigate the limiting behavior, as $N\rightarrow \infty$, of the equilibrium at a queue when the service discipline is FIFO and the service time distribution has a power law with a given exponent $-β$, for $β>1$. We show under the above ansatz that, as $N\rightarrow\infty$, the tail of the equilibrium queue size exhibits a wide range of behavior depending on the relationship between $β$ and $D$. In particular, if $β>D/(D-1)$, the tail is doubly exponential and, if $β
description: Published in at http://dx.doi.org/10.1214/12-AAP888 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
The strong subadditivity of holographic entanglement entropy ; from boundary to bulk
Creators: name: Rad, Ali I.
Publisher: name: University of British Columbia
Year: 2017

description: One decade ago, Ryu-Takayanagi explicitly introduced a formula that relates the entropy of a subregion in CFT system to a geometrical quantity which is called minimal surface in hyperbolic space. This formula extended to the idea of connection of gravy to quantum mechanics of gauge/gravity duality. This duality which can help us to learn a more interesting feature of each side from the other. Quantum systems obey from some constraints come from the quantum information theory. I would be interesting to find out what is the dual of this constraint in the gravitation system. Dual to the specific class of quantum theories which is called conformal field theories. One of the most significant constraint that QFTs should obey is the strong subadditivity of entanglement entropy. These constraints let the theories have bound on the energy spectrum from the below; Recently there has been the development that the combination of monotonicity of relative entropy and the strong subadditivity of entanglement entropy is equal to have a specific bound on the energy momentum tensor, called quantum null energy condition. In this thesis, we re-look to this argument by introducing the entanglement density and obtain a differential operator from the strong subadditivity and exploiting from the Markov property of the vacuum of CFT. In the next step, by using from the Ryu-Takayangi, we rewrite the strong subadditivity inequality regarding geometrical quantities. By using from the kinematic languages and intertwinement, we realize that the strong subadditivity at the boundary implies new bound on averaged energy condition which has some common feature with the quantum null energy condition statement.
Opinion fluctuations and disagreement in social networks
Creators: name: Acemoglu, Daron
name: Como, Giacomo
name: Fagnani, Fabio
name: Ozdaglar, Asuman
Publisher: name: arXiv
Year: 2010
Subjects: subject: Social and Information Networks (cs.SI)
subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: Probability (math.PR)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: We study a tractable opinion dynamics model that generates long-run disagreements and persistent opinion fluctuations. Our model involves an inhomogeneous stochastic gossip process of continuous opinion dynamics in a society consisting of two types of agents: regular agents, who update their beliefs according to information that they receive from their social neighbors; and stubborn agents, who never update their opinions. When the society contains stubborn agents with different opinions, the belief dynamics never lead to a consensus (among the regular agents). Instead, beliefs in the society fail to converge almost surely, the belief profile keeps on fluctuating in an ergodic fashion, and it converges in law to a non-degenerate random vector. The structure of the network and the location of the stubborn agents within it shape the opinion dynamics. The expected belief vector evolves according to an ordinary differential equation coinciding with the Kolmogorov backward equation of a continuous-time Markov chain with absorbing states corresponding to the stubborn agents and converges to a harmonic vector, with every regular agent's value being the weighted average of its neighbors' values, and boundary conditions corresponding to the stubborn agents'. Expected cross-products of the agents' beliefs allow for a similar characterization in terms of coupled Markov chains on the network. We prove that, in large-scale societies which are highly fluid, meaning that the product of the mixing time of the Markov chain on the graph describing the social network and the relative size of the linkages to stubborn agents vanishes as the population size grows large, a condition of \emph{homogeneous influence} emerges, whereby the stationary beliefs' marginal distributions of most of the regular agents have approximately equal first and second moments.
description: 33 pages, accepted for publication in Mathematics of Operation Research
Contextualizing Open Data Quality: Institutional Factors and the Openness of City Data Portals
Creators: name: Posa, Pranathi Siva
Publisher: name: University of Chicago
Year: 2022

description: With municipal data portals becoming more commonplace among big cities, the ten Open Government Data Principles principles provide a benchmark for the effective release of government data, possibly serving as a goal for cities to aspire towards achieving in the name of increasing transparency, participation, and innovation. This paper examines the data portals of 32 cities to assess their adherence with the ten principles, and conducts an investigation into what institutional factors may have significant effect on a city’s overall data quality and its adherence to specific principles. It discovers that cities have strong OGD foundations, but that much improvement is still required to achieve full adherence, and that there are no consistent associations between institutional factors and performance on individual data principles. Going forward, it is critical to establish guidelines for what data should be published, and for cities to take greater ownership over data catalog construction.
TVA-based assessment of visual attentional functions in developmental dyslexia
Creators: name: Bogon, Johanna
name: Finke, Kathrin
name: Stenneken, Prisca
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: developmental dyslexia, visual attention, processing speed, visual short term memory, spatial bias, top–down control, whole- and partial-report task
subject: 150 Psychologie

description: There is an ongoing debate whether an impairment of visual attentional functions constitutes an additional or even an isolated deficit of developmental dyslexia (DD). Especially performance in tasks that require the processing of multiple visual elements in parallel has been reported to be impaired in DD. We review studies that used parameter-based assessment for identifying and quantifying impaired aspect(s) of visual attention that underlie this multi-element processing deficit in DD. These studies used the mathematical framework provided by the “theory of visual attention” (Bundesen, 1990) to derive quantitative measures of general attentional resources and attentional weighting aspects on the basis of behavioral performance in whole- and partial-report tasks. Based on parameter estimates in children and adults with DD, the reviewed studies support a slowed perceptual processing speed as an underlying primary deficit in DD. Moreover, a reduction in visual short term memory storage capacity seems to present a modulating component, contributing to difficulties in written language processing. Furthermore, comparing the spatial distributions of attentional weights in children and adults suggests that having limited reading and writing skills might impair the development of a slight leftward bias, that is typical for unimpaired adult readers.
Heavy baryon--light vector meson couplings in QCD
Creators: name: Aliev, T. M.
name: Azizi, K.
name: Savci, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The strong coupling constants of heavy baryons with light vector mesons are calculated in the framework of the light cone QCD sum rules using the most general form of the interpolating currents for the heavy baryons. It is shown that the sextet--sextet, sextet--antitriplet and antitriplet--antitriplet transitions are described by one invariant function for each class of transitions. The values of the electric and magnetic coupling constants for these transitions are obtained.
description: 16 Pages, 4 Figures and 7 Tables
On Zaremba's Conjecture
Creators: name: Bourgain, Jean
name: Kontorovich, Alex
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11D85, 11P55, 37B10

description: It is shown that there is a constant A and a density one subset S of the positive integers, such that for all q in S there is some 1<=p
description: Research announcement, 4 pages
MPEC 2025-F246 : 2022 SW12
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Transport Properties of a 3D Topological Insulator based on a Strained High-Mobility HgTe Film
Creators: name: Kozlov, D. A.
name: Kvon, Z. D.
name: Olshanetsky, E. B.
name: Mikhailov, N. N.
name: Dvoretsky, S. A.
name: Weiss, Dieter
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik
subject: 73.25.+i
subject: 05.60.Gg
subject: 73.20.At
subject: 73.43.-f

description: We investigate the magnetotransport properties of strained 80 nm thick HgTe layers featuring a high mobility of μ∼4×105 cm2/V⋅s. By means of a top gate, the Fermi energy is tuned from the valence band through the Dirac-type surface states into the conduction band. Magnetotransport measurements allow us to disentangle the different contributions of conduction band electrons, holes, and Dirac electrons to the conductivity. The results are in line with previous claims that strained HgTe is a topological insulator with a bulk gap of ≈15 meV and gapless surface states.
Geometric Decision Tree
Creators: name: Manwani, Naresh
name: Sastry, P. S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this paper we present a new algorithm for learning oblique decision trees. Most of the current decision tree algorithms rely on impurity measures to assess the goodness of hyperplanes at each node while learning a decision tree in a top-down fashion. These impurity measures do not properly capture the geometric structures in the data. Motivated by this, our algorithm uses a strategy to assess the hyperplanes in such a way that the geometric structure in the data is taken into account. At each node of the decision tree, we find the clustering hyperplanes for both the classes and use their angle bisectors as the split rule at that node. We show through empirical studies that this idea leads to small decision trees and better performance. We also present some analysis to show that the angle bisectors of clustering hyperplanes that we use as the split rules at each node, are solutions of an interesting optimization problem and hence argue that this is a principled method of learning a decision tree.
description: Licensed copy is available on IEEE website
A clinical C-arm base-tracking system using computer vision for intraoperative guidance
Creators: name: Haliburton, Luke
Publisher: name: University of British Columbia
Year: 2017

description: Mobile C-arm X-ray machines are commonly used for imaging during orthopaedic surgeries to visualize internal anatomy during procedures. However, there is evidence indicating that excess operating time and radiation exposure result from the use of scouting images to aid C-arm positioning during surgery. Additionally, C-arms are currently used primarily as a qualitative tool. Several techniques have been proposed to improve positioning, reduce radiation exposure, and increase quantitative utility, but they require accurate C-arm position tracking. There have been attempts by other research groups to develop C-arm tracking systems, but there are currently no solutions suitable for use in an operating room. The objective of this thesis is therefore to present the development and verification of a real-time C-arm base-tracking system called OPTIX (On-board Position Tracking for Intraoperative X-rays). The proposed tracking system uses a single floor-facing camera mounted to the base of a C-arm. A computer vision algorithm was developed that tracks motion relative to the operating room floor. This system is capable of relative motion tracking as well as absolute position recovery for previous positions. The accuracy of the system was evaluated on a real C-arm in a simulated operating room. The experimental results demonstrated that the relative tracking algorithm can measure C-arm translation with errors of less than 0.75% of the total distance travelled, and orientation with errors better than 5% of the cumulative rotation. With the incorporated loop closure step, OPTIX can be used to achieve C-arm repositioning with translation errors of less than 1.10±0.07 mm and rotation errors of less than 0.17 ±0.02°. These results are well within the desired system requirements of 5 mm and 3.1°. The system has shown promising results for use as a C-arm base-tracking system. The system has clinically acceptable accuracies and should lead to a reduced need for scouting images when re-obtaining a previous position. The base-tracking system can be integrated with a C-arm joint tracking system, or implemented on its own for steering guidance. When implemented in an operating room, OPTIX has the potential to lead to a reduction in operating time and harmful radiation exposure to surgical staff.
The extracellular loop 2 (ECL2) of the human histamine H4 receptor substantially contributes to ligand binding and constitutive activity
Creators: name: Wifling, David
name: Bernhardt, Günther
name: Dove, Stefan
name: Buschauer, Armin
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: constitutive activity; ligand binding; extracellular loop; ECL2; histamine; histamine H4 receptor; FF motif; site-directed mutagenesis; GTP(gamma)S binding; radioligand binding; Sf9 cells; JNJ7777120; clozapine; isoloxapine; VUF8430; Immepip; clobenpropit; thioperamide; UR-PI376; UR-PI294
subject: 615 Pharmazie

description: In contrast to the corresponding mouse and rat orthologs, the human histamine H4 receptor (hH4R) shows extraordinarily high constitutive activity. In the extracellular loop, replacement of F169 by V as in the mouse H4R significantly reduced constitutive activity. Stabilization of the inactive state was even more pronounced for a double mutant, in which, in addition to F169V, S179 in the ligand binding site was replaced by M. To study the role of the FF motif in ECL2, we generated the hH4R-F168A mutant. The receptor was co-expressed in Sf9 insect cells with the G-protein subunits Gαi2 and Gβ1γ2, and the membranes were studied in 3Hhistamine binding and functional 35SGTPγS assays. The potency of various ligands at the hH4R-168A mutant decreased compared to the wild-type hH4R, for example by 30- and more than 100-fold in case of UR-PI376 and histamine, respectively. The high constitutive activity of the hH4R was completely lost in the hH4R-F168A mutant, as reflected by neutral antagonism of thioperamide, a full inverse agonist at the wild-type hH4R. Thus, F168 was proven to play a key role not only in ligand binding and potency, but also in the high constitutive activity of the hH4R.
Tinkertoys for the D_N series
Creators: name: Chacaltana, Oscar
name: Distler, Jacques
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We describe a procedure for classifying 4D N=2 superconformal theories of the type introduced by Davide Gaiotto. Any punctured curve, C, on which the 6D (2,0) SCFT is compactified, may be decomposed into 3-punctured spheres, connected by cylinders. The 4D theories, which arise, can be characterized by listing the "matter" theories corresponding to 3-punctured spheres, the simple gauge group factors, corresponding to cylinders, and the rules for connecting these ingredients together. Different pants decompositions of $ correspond to different S-duality frames for the same underlying family of 4D N=2 SCFTs. In a previous work [1], we developed such a classification for the A_{N-1} series of 6D (2,0) theories. In the present paper, we extend this to the D_N series. We outline the procedure for general D_N, and construct, in detail, the classification through D_4. We discuss the implications for S-duality in Spin(8) and Spin(7) gauge theory, and recover many of the dualities conjectured by Argyres and Wittig [2].
description: 53 pages, 268 figures, LaTeX2e, utarticle class. Version 3: JHEP version, with a few typos in the tables corrected. Version 2: global symmetries corrected, for 7 entries in table of interacting SCFTs in D4 theory. Thanks to Simone Giacomelli and Yuji Tachikawa for alerting us to the problem in version 1
Analytic Torsion on Manifolds with Edges
Creators: name: Mazzeo, Rafe
name: Vertman, Boris
Publisher: name: arXiv
Year: 2011
Subjects: subject: Spectral Theory (math.SP)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 58J52

description: Let (M,g) be an odd-dimensional incomplete compact Riemannian singular space with a simple edge singularity. We study the analytic torsion on M, and in particular consider how it depends on the metric g. If g is an admissible edge metric, we prove that the torsion zeta function is holomorphic near s = 0, hence the torsion is well-defined, but possibly depends on g. In general dimensions, we prove that the analytic torsion depends only on the asymptotic structure of g near the singular stratum of M; when the dimension of the edge is odd, we prove that the analytic torsion is independent of the choice of admissible edge metric. The main tool is the construction, via the methodology of geometric microlocal analysis, of the heat kernel for the Friedrichs extension of the Hodge Laplacian in all degrees. In this way we obtain detailed asymptotics of this heat kernel and its trace.
description: 36 pages, 5 figures, v2: minor improvements
A Nano-sized Supramolecule Beyond the Fullerene Topology
Creators: name: Dielmann, Fabian
name: Heindl, Claudia
name: Hastreiter, F.
name: Peresypkina, E. V.
name: Virovets, A. V.
name: Gschwind, R. M.
name: Scheer, M.
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: copper Cp ligands phosphorus self-assembly supramolecular chemistry
subject: 540 Chemie

description: The reaction of [CpBnFe(η5-P5)] (1) (CpBn=η5-C5(CH2Ph)5) with CuI selectively yields a novel spherical supramolecule (CH2Cl2)3.4@[(CpBnFeP5)12{CuI}54(MeCN)1.46] (2) showing a linkage of the scaffold atoms which is beyond the Fullerene topology. Its extended CuI framework reveals an outer diameter of 3.7 nm—a size that has not been reached before using five-fold symmetric building blocks. Furthermore, 2 shows a remarkable solubility in CH2Cl2, and NMR spectroscopy reveals that the scaffold of the supramolecule remains intact in solution. In addition, a novel 2D polymer [{CpBnFe(η5-P5)}2{Cu6(μ-I)2(μ3-I)4}]n (3) with an uncommon structural motif was isolated. Its formation can be avoided by using a large excess of CuI in the reaction with 1.
A metric Kan-Thurston theorem
Creators: name: Leary, Ian J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Group Theory (math.GR)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 20F67 (Primary) 20J06, 55P99, 57S30 (Secondary)

description: For every simplicial complex X, we construct a locally CAT(0) cubical complex T_X, a cellular isometric involution i on T_X and a map t_X from T_X to X with the following properties: t_Xi = t_X; t_X is a homology isomorphism; the induced map from the quotient of T_X by the involution i to X is a homotopy equivalence; the induced map from the fixed point subspace for i in T_X to X is a homology isomorphism. The construction is functorial in X. One corollary is an equivariant Kan-Thurston theorem: every connected proper G-CW-complex has the same equivariant homology as the classifying space for proper actions of some other group. From this we obtain an extension of Quillen's theorem on the spectrum of an equivariant cohomology ring and an extension of a result of Block concerning assembly conjectures. Another corollary of our main result is that there can be no algorithm to decide whether a CAT(0) cubical group is generated by torsion. In appendices we prove some foundational results concerning cubical complexes, including the infinite dimensional case. We characterize the cubical complexes for which the natural metric is complete; we establish Gromov's criterion for infinite-dimensional cubical complexes; we show that every CAT(0) cube complex is cubical; we deduce that the second cubical subdivision of any locally CAT(0) cube complex is cubical.
description: 41 pages, 4 figures made from 11 picture files. Version 2 contains some corrections to the proofs in the appendices, mainly section 16. Version 3 is the version accepted for publication in the Journal of Topology. Version 3 is down to 34 pages, partly due to page style, partly some material removed. Minor correction to proof of Theorem 6.1 of Version 3
Conductance anomalies of CoFeB/MgO/CoFeB magnetic tunnel junctions
Creators: name: Ringer, Sebastian
name: Vieth, M.
name: Bär, L.
name: Rührig, M.
name: Bayreuther, Günther
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik
subject: 72.25.−b, 73.40.Gk, 85.70.Kh

description: The I−V characteristics of CoFeB/MgO/CoFeB magnetic tunnel junctions show pronounced nonlinearities which are relevant both for sensor applications and for the basic understanding of spin-dependent tunneling. To study the relation between the tunnel characteristics and the tunnel magnetoresistance (TMR) ratio, a series of CoFeB/MgO/CoFeB junctions was annealed with stepwise increasing annealing time at different temperatures. The related TMR ratio and the I−V characteristics were measured in the temperature range between 15 K and 300 K. This allowed the comparison of I−V characteristics of the same junction for TMR ratios between 25% and 150% at 300 K thus eliminating the influence of variations in the preparation process of separate individual samples. In addition to a zero bias anomaly observed in particular at low temperatures and for large TMR ratios, a conductance anomaly in the I−V curves was observed around a bias voltage of 350 mV. A general correlation between the deviation from Ohmic I−V characteristics and the TMR ratio was found both for parallel and antiparallel magnetizations of both ferromagnetic layers. This means that the shape of the I−V curves directly scales with the spin polarization of the tunneling current and the proportion of coherent electron tunneling. Both the 350 mV conductance anomaly and the correlation between non-Ohmic characteristics and the TMR ratio can be explained by considering the contributions of the relevant majority and minority spin bands of the ferromagnetic contacts.