cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
GinJinn: An object‐detection pipeline for automated feature extraction from herbarium specimens
Creators: name: Ott, Tankred
name: Palm, Christoph
name: Vogt, Robert
name: Oberprieler, Christoph
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: deep learning; herbarium specimens; object detection; TensorFlow; visual recognition
subject: 580 Pflanzen (Botanik)

description: Premise The generation of morphological data in evolutionary, taxonomic, and ecological studies of plants using herbarium material has traditionally been a labor‐intensive task. Recent progress in machine learning using deep artificial neural networks (deep learning) for image classification and object detection has facilitated the establishment of a pipeline for the automatic recognition and extraction of relevant structures in images of herbarium specimens. Methods and Results We implemented an extendable pipeline based on state‐of‐the‐art deep‐learning object‐detection methods to collect leaf images from herbarium specimens of two species of the genus Leucanthemum. Using 183 specimens as the training data set, our pipeline extracted one or more intact leaves in 95% of the 61 test images. Conclusions We establish GinJinn as a deep‐learning object‐detection tool for the automatic recognition and extraction of individual leaves or other structures from herbarium specimens. Our pipeline offers greater flexibility and a lower entrance barrier than previous image‐processing approaches based on hand‐crafted features.
Towards Higgs boson production in gluon fusion to NNLO in the MSSM
Creators: name: Pak, Alexey
name: Steinhauser, Matthias
name: Zerf, Nikolai
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the Higgs boson production in the gluon-fusion channel to next-to-next-to-leading order within the Minimal Supersymmetric Standard Model. In particular, we present analytical results for the matching coefficient of the effective theory and study its influence on the total production cross section in the limit where the masses of all MSSM particles coincide. For supersymmetric masses below 500 GeV it is possible to find parameters leading to a significant enhancement of the Standard Model cross section, the $K$-factors, however, change only marginally.
description: 20 pages; v2: modification of discussion of numerical effect, version to appear in EPJC; v3: eq.(18) corrected, minor corrections
A multi-omics analysis reveals the unfolded protein response regulon and stress-induced resistance to folate-based antimetabolites
Creators: name: Reich, Stefan
name: Nguyen, Chi D. L.
name: Has, Canan
name: Steltgens, Sascha
name: Soni, Himanshu
name: Coman, Cristina
name: Freyberg, Moritz
name: Bichler, Anna
name: Seifert, Nicole
name: Conrad, Dominik
name: Knobbe-Thomsen, Christiane B.
name: Tews, Björn
name: Toedt, Grischa
name: Ahrends, Robert
name: Medenbach, Jan
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: Gene expression, Gene regulation, Protein aggregation, reverse transcription polymerase chain reaction, RNA
subject: 570 Biowissenschaften, Biologie

description: Stress response pathways are critical for cellular homeostasis, promoting survival through adaptive changes in gene expression and metabolism. They play key roles in numerous diseases and are implicated in cancer progression and chemoresistance. However, the underlying mechanisms are only poorly understood. We have employed a multi-omics approach to monitor changes to gene expression after induction of a stress response pathway, the unfolded protein response (UPR), probing in parallel the transcriptome, the proteome, and changes to translation. Stringent filtering reveals the induction of 267 genes, many of which have not previously been implicated in stress response pathways. We experimentally demonstrate that UPR‐mediated translational control induces the expression of enzymes involved in a pathway that diverts intermediate metabolites from glycolysis to fuel mitochondrial one‐carbon metabolism. Concomitantly, the cells become resistant to the folate-based antimetabolites Methotrexate and Pemetrexed, establishing a direct link between UPR‐driven changes to gene expression and resistance to pharmacological treatment.
title: Обработка сигналов при работе РЛС по технологии MIMO
Creators: name: Шахов, Денис
name: Крюков, Даниил
Publisher: name: Новгородский государственный университет имени Ярослава Мудрого (НовГУ)
Year: 2021

description: Моделирование формирования и обработки сигналов важно при проектировании любых радиолокационных станций. Для MIMO радаров оно позволяет выбрать наилучшее пространственное положение передающих и приемных антенн. В статье описывается модель обработки сигналов в радиолокационной станции, содержащей линейку M передатчиков и N приемников. Приводятся результаты моделирования.
Reduction maps and minimal model theory
Creators: name: Gongyo, Yoshinori
name: Lehmann, Brian
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14E30

description: We use reduction maps to study the minimal model program. Our main result is that the existence of a good minimal model for a klt pair $(X,Δ)$ can be detected on the base of the $(K_{X}+Δ)$-trivial reduction map. Thus we show that the main conjectures of the minimal model program can be interpreted as a natural statement on the existence of curves on $X$.
description: 19 pages, v2:major revised
DNA origami-based single-molecule force spectroscopy elucidates RNA Polymerase III pre-initiation complex stability
Creators: name: Kramm, Kevin
name: Schröder, Tim
name: Gouge, Jerome
name: Vera, Andrés Manuel
name: Gupta, Kapil
name: Heiss, Florian B.
name: Liedl, Tim
name: Engel, Christoph
name: Berger, Imre
name: Vannini, Alessandro
name: Tinnefeld, Philip
name: Grohmann, Dina
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: Biochemistry, Biophysics, Nanoscale biophysics, Single-molecule biophysics, Transcription
subject: 570 Biowissenschaften, Biologie

description: The TATA-binding protein (TBP) and a transcription factor (TF) IIB-like factor are important constituents of all eukaryotic initiation complexes. The reason for the emergence and strict requirement of the additional initiation factor Bdp1 in the RNA polymerase (RNAP) III system, however, remained elusive. A poorly studied aspect in this context is the effect of DNA strain arising from DNA compaction and transcriptional activity on initiation complex formation. We made use of a DNA origami-based force clamp to follow the assembly of human initiation complexes in the RNAP II and RNAP III systems at the single-molecule level under piconewton forces. We demonstrate that TBP-DNA complexes are force-sensitive and TFIIB is sufficient to stabilise TBP on a strained promoter. In contrast, Bdp1 is the pivotal component that ensures stable anchoring of initiation factors, and thus the polymerase itself, in the RNAP III system. Thereby, we offer an explanation for the crucial role of Bdp1 for the high transcriptional output of RNAP III.
A new Lenstra-type Algorithm for Quasiconvex Polynomial Integer Minimization with Complexity 2^O(n log n)
Creators: name: Hildebrand, Robert
name: Köppe, Matthias
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optimization and Control (math.OC)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 90C10, 90C25

description: We study the integer minimization of a quasiconvex polynomial with quasiconvex polynomial constraints. We propose a new algorithm that is an improvement upon the best known algorithm due to Heinz (Journal of Complexity, 2005). This improvement is achieved by applying a new modern Lenstra-type algorithm, finding optimal ellipsoid roundings, and considering sparse encodings of polynomials. For the bounded case, our algorithm attains a time-complexity of s (r l M d)^{O(1)} 2^{2n log_2(n) + O(n)} when M is a bound on the number of monomials in each polynomial and r is the binary encoding length of a bound on the feasible region. In the general case, s l^{O(1)} d^{O(n)} 2^{2n log_2(n) +O(n)}. In each we assume d>= 2 is a bound on the total degree of the polynomials and l bounds the maximum binary encoding size of the input.
description: 28 pages, 10 figures
SSIBAC: Self-Sovereign Identity Based Access Control
Creators: name: Belchior, Rafael
name: Putz, Benedikt
name: Pernul, Günther
name: Correia, Miguel
name: Vasconcelos, André
name: Guerreiro, Sérgio
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: decentralized identity;decentralized authorization;attribute-based authorization
subject: 004 Informatik
subject: 330 Wirtschaft

description: Data breaches combined with ineffective data management practises pose serious issues to consumers and enterprises, such as identity theft and online exposure. Although the general data protection regulation (GDPR) attempts to protect the consumers, often companies cannot avoid data breaches. This leads to negative consequences, e.g., companies loosing credibility and paying fines. In this work, we alleviate the data breach and the user privacy problems by showing how to fit decentralized identities within the context of established enterprise identity and access management technologies. In light of recent endeavours, we explore the usage of decentralized identifiers, verifiable credentials, and blockchains that support self-sovereign identity to foster identity portability, and the decoupling of access control processes with the storage of sensitive data from users. We propose a simplified access control method that can be applied to cross-organizational identity management, that aims to reduce the impact of data breaches. The Self-Sovereign Identity Access Control (SSIBAC) model leverages blockchain technology to provide decentralized authentication followed by centralized or decentralized authorization. We show that our access control model achieves properties X, Y,Z. Our preliminary implementation of the model can process one access control request every two seconds, proving to be practical in scenarios not requiring real-time performance.
description: © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Neuroenergetics and “General Intelligence”: A Systems Biology Perspective
Creators: name: Debatin, Tobias
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: general intelligence; mitochondria; energy metabolism; network models; development of intelligence; glucose regulation; neuroenergetics; systems
subject: 370 Erziehung, Schul- und Bildungswesen

description: David C. Geary proposed the efficiency of mitochondrial processes, especially the production of energy, as the most fundamental biological mechanism contributing to individual differences in general intelligence (g). While the efficiency of mitochondrial functioning is undoubtedly an important and highly interesting factor, I outline several reasons why other main factors of neuroenergetics should not be neglected and why a systems biology perspective should be adopted. There are many advantages for research on intelligence to focus on individual differences in the capability of the overall brain metabolism system to produce the energy currency adenosine triphosphate (ATP): higher predictive strength than single mechanisms, diverse possibilities for experimental manipulation, measurement with existing techniques and answers to unresolved questions because of multiple realizability. Many of these aspects are especially important for research on developmental processes and the building and refining of brain networks for adaptation. Focusing too much on single parts of the system, like the efficiency of mitochondrial functioning, carries the danger of missing important information about the role of neuroenergetics in intelligence and valuable research opportunities
A Breathing Mode for Warped Compactifications
Creators: name: Underwood, Bret
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In general warped compactifications, non-trivial backgrounds for the warp factor and the dilaton break $D$-dimensional diffeomorphism invariance, so that dilaton fluctuations can be gauged away completely and eaten by the metric. More specifically, the warped volume modulus and the dilaton are not independent, but combine into a single gauge-invariant degree of freedom in the lower dimensional effective theory, the warped breathing mode. This occurs for all strengths of the warping, even the weakly warped limit. This warped breathing mode appears as a natural zero mode deformation of backgrounds sourced by p-branes, and affects the identification of the independent degrees of freedom of flux compactifications.
description: 33 pages. v2: Added references, comments. v3: Updated discussion, added references
title: A implementação de um sistema CRIS: Universidade Católica Portuguesa
Creators: name: Marçal, Bruno
name: Folque, Ana
name: Dias, João Carlos Sebastião
name: Catanho, Cláudia
name: Duque Perdigão, Maria Miguel
Publisher: name: Universidade Católica Portuguesa
Year: 2021

description: A Universidade Católica Portuguesa, na qualidade de Research University, implementou um sistema CRIS (Current Research Information System), denominado Ciência-UCP. Destacamos, neste documento, alguns aspetos que resultaram do processo de implementação, bem como as funcionalidades que a plataforma disponibiliza. São referenciadas as abordagens à gestão da produção científica, a interoperabilidade com sistemas internos e externos à instituição, a gestão de teses e dissertações defendidas na UCP e a obtenção de métricas e indicadores. Por fim, são referidos outros módulos disponíveis na plataforma, mas que ainda se encontram em fase de desenvolvimento, como dos dados de investigação, projetos/financiamento e produção científica não-textual.
Clonal diversity and genetic variation of the sedge Carex nigra in an alpine fen depend on soil nutrients
Creators: name: Reisch, Christoph
name: Meier, Stefanie
name: Schmid, Christoph
name: Bartelheimer, Maik
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: Microsatellites, Carex nigra, Clonality, High alpine fen, Soil nutrients
subject: 570 Biowissenschaften, Biologie

description: In this study we analysed the impact of water regime and soil nutrients on the clonal diversity and genetic variation of the sedge Carex nigra in a central alpine fen. For our analysis, we established 16 study plots randomly distributed over the fen. We determined the exact elevation of each plot as an indicator for the water regime and measured the content of phosphorous and potassium in the soil of each plot. Clonal diversity and genetic variation of C. nigra were assessed with nuclear microsatellites using leaf material collected in 20 subplots along a diagonal cross within each study plot. The influence of water regime and soil mineral nutrients on clonal diversity and genetic variation was estimated by Bayesian multiple regression. Our study revealed a clear impact of soil nutrient conditions on clonal diversity and genetic variation of C. nigra, which increased with the concentration of phosphorous and decreased with the concentration of potassium. Key background to these findings seems to be the relative offspring success from generative as compared to clonal propagation. Phosphorous acquisition is essential during seedling establishment. Clonal diversity and genetic variation increase, therefore, at sites with higher phosphorous contents due to more successful recruitment. High levels of clonal diversity and genetic variation at sites of low potassium availability may in contrast be mainly caused by increased plant susceptibility to abiotic stress under conditions of potassium deficiency, which brings about more gaps in C. nigra stands and favors the ingrowth from other clones or recruitment from seeds.
Engineering optical properties using layered metamaterials
Creators: name: Al Shakhs, Mohammed Hashim
Publisher: name: University of British Columbia
Year: 2017

description: This thesis explores the concept of metamaterials; a fairly recent concept in the literature which has attracted the attention of researchers due to their abnormal electromagnetic properties. We will particularly consider one dimensional version of a metamaterial made of layers. At the first glance, layered metamaterials are simply multi-layer thin films. The distinguishing feature of layered metamaterials is that they usually incorporate metals whereas most thin film structures in the past have only incorporated dielectrics. The immense interest in certain layered configurations of metals and dielectrics, particularly when the thicknesses are really thin compared to the wavelength, is due to their exhibition of seemingly counter-intuitive or impossible properties such as refraction to the same side of normal (negative refraction), evanescent wave amplification, or light focusing with a flat interface (flat lensing). The simple configuration of layered metamaterials and their interesting properties are the prime motivations of this work. In this thesis, we first start with a very generic electromagnetic description of the optical properties of layered structures. This general description appears to be novel due to presenting theory in new form. We use this understanding to explain how and why certain layered structures can exhibit negative refraction or flat lensing. This investigation has also led to several new predictions of new optical properties of layered metamaterial structures. We conclude this work by various experimental studies which validate the predictions of the work and also explore fabrication challenges in the making of layered metamaterials.
Fractional Chern Insulators and the W-Infinity Algebra
Creators: name: Parameswaran, S. A.
name: Roy, R.
name: Sondhi, S. L.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A set of recent results indicates that fractionally filled bands of Chern insulators in two dimensions support fractional quantum Hall states analogous to those found in fractionally filled Landau levels. We provide an understanding of these results by examining the algebra of Chern band projected density operators. We find that this algebra closes at long wavelengths and for constant Berry curvature, whereupon it is isomorphic to the W-Infinity algebra of lowest Landau level projected densities first identified by Girvin, MacDonald and Platzman [Phys. Rev. B 33, 2481 (1986).] For Hamiltonians projected to the Chern band this provides a route to replicating lowest Landau level physics on the lattice.
description: 4 pages; v2 contains minor changes, including brief discussion of disorder, version published in Phys. Rev. B (Rapid Communications)
On exponential frames near the critical density
Creators: name: Bownik, Marcin
name: van Velthoven, Jordy Timo
Publisher: name: arXiv
Year: 2024
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: Given a relatively compact set $Ω\subseteq \mathbb{R}$ of Lebesgue measure $|Ω|$ and $\varepsilon > 0$, we show the existence of a set $Λ\subseteq \mathbb{R}$ of uniform density $D (Λ) \leq (1+\varepsilon) |Ω|$ such that the exponential system $\{ \exp(2πi λ\cdot) \mathbf{1}_Ω: λ\in Λ\}$ is a frame for $L^2 (Ω)$ with frame bounds $A |Ω|, B |Ω|$ for constants $A,B$ only depending on $\varepsilon$. This solves a problem on the frame bounds of an exponential frame near the critical density posed by Nitzan, Olevskii and Ulanovskii. We also prove an extension to locally compact abelian groups, which improves a result by Agora, Antezana and Cabrelli by providing frame bounds involving the spectrum.
description: Final version. Throughout the paper, the spectrum is now assumed to be compact rather than relatively compact. Some additional typos have been fixed
Trail Pheromone Does Not Modulate Subjective Reward Evaluation in Lasius niger Ants
Creators: name: Czaczkes, Tomer J.
name: Wendt, Stephanie
name: Oberhauser, Felix Benjamin
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: social information, value perception, preference, conformity, recruitment, pheromone trails
subject: 590 Tiere (Zoologie)

description: Comparing the value of options is at the heart of economic decision-making. While an option may have an absolute quality (e.g. a food source has a fixed energy content), the perceived value of the option may be malleable. The factors affecting the perceived value of an option may thus strongly influence which option is ultimately chosen. Expectations have been shown to be a strong driver of perceived value in both humans and social insects, causing an undervaluation of a given option if a better option was expected, and an overvaluation if a poorer one was expected. In humans, perceived value can be strongly affected by social information. Value perception in some insects has also been shown to be affected by social information, showing conformism as in humans and other animals. Here, over a series of experiments, we tested whether pheromone trail presence, a social information source, influenced the perceived value of a food source in the ant Lasius niger. We found that the presence of pheromone trails leading to a sucrose solution does not influence food acceptance, pheromone deposition when returning from a food source, drinking time, or frequency of U-turns on return from the food. Two further assays for measuring changes in food acceptance, designed to increase sensitivity by avoiding ceiling effects, also showed no effect of pheromone presence on food acceptance. In a separate study, L. niger have also been found to show no preference for, or avoidance of, odors associated with foods found in the presence of pheromone. We are thus confident that trail pheromone presence does not affect the perceived value of a food source in these ants.
Asymptotics of empirical copula processes under non-restrictive smoothness assumptions
Creators: name: Segers, Johan
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Weak convergence of the empirical copula process is shown to hold under the assumption that the first-order partial derivatives of the copula exist and are continuous on certain subsets of the unit hypercube. The assumption is non-restrictive in the sense that it is needed anyway to ensure that the candidate limiting process exists and has continuous trajectories. In addition, resampling methods based on the multiplier central limit theorem, which require consistent estimation of the first-order derivatives, continue to be valid. Under certain growth conditions on the second-order partial derivatives that allow for explosive behavior near the boundaries, the almost sure rate in Stute's representation of the empirical copula process can be recovered. The conditions are verified, for instance, in the case of the Gaussian copula with full-rank correlation matrix, many Archimedean copulas, and many extreme-value copulas.
description: Published in at http://dx.doi.org/10.3150/11-BEJ387 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Bianchi $VII_A$ solutions of quadratic gravity
Creators: name: de Deus, Juliano A.
name: Müller, Daniel
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: It is believed that soon after the Planck time, Einstein's general relativity theory should be corrected to an effective quadratic theory. Numerical solutions for the anisotropic generalization of the Friedmann "open" model $H^ 3$ for this effective gravity are given. It must be emphasized that although numeric, these solutions are exact in the sense that they depend only on the precision of the machine. The solutions are identified asymptotically in a certain way. It is found solutions which asymptote de Sitter space, Riemann flat space and a singularity. The question of isotropisation of an initially anisotropic Universe is of great importance in the context of cosmology. Although isotropisation is not directly discussed in this present work, we show that sufficiently small anisotropies, do not increase indefinitely according to particular quadratic gravity theories. It can be understood as weak isotropisation, and we stress that this result is strongly dependent on initial conditions.
description: version accepted for publication in General Relativity and Gravitation. arXiv admin note: substantial text overlap with arXiv:1203.6882
title: Portal das Revistas Científicas da Universidade Católica Portuguesa
Creators: name: Marçal, Bruno
name: Folque, Ana
name: Dias, João Carlos Sebastião
name: Catanho, Cláudia
name: Duque Perdigão, Maria Miguel
Publisher: name: Universidade Católica Portuguesa
Year: 2021

description: A Universidade Católica Portuguesa (UCP) tem uma vasta tradição na publicação de revistas científicas nas diversas áreas de conhecimento que a caracterizam. Contudo, após uma análise exaustiva, foi possível constatar uma multiplicidade de contextos, nomeadamente, revistas que já tinham terminado a sua atividade editorial, sendo o suporte de publicação variável entre papel, on-line ou ambos, algumas já faziam uso de uma plataforma como o OJS ou equivalente. O seu nível de aptidão para indexação em bases de referência era igualmente muito díspar, inclusivamente em função das práticas editoriais vigentes, verificando-se ainda assimetrias no que diz respeito às suas políticas de Acesso Aberto.
Este levantamento veio confirmar que a disponibilização de uma plataforma passível de ser utilizada por toda a comunidade académica, permitiria alcançar diversos objetivos estratégicos. Assim, foi definida uma linha de ação com vista à implementação de uma infraestrutura de apoio às revistas científicas editadas na UCP, sustentada num conjunto de boas práticas identificadas tanto a nível nacional como internacional. O Portal das Revistas Científicas foi apresentado publicamente em novembro de 2019, registando-se de imediato uma dinâmica muito expressiva, contando neste momento com 23 revistas, 13 das quais ativas, que disponibilizam mais de 7000 documentos em Acesso Aberto.
Do Technology Transfer Networks Impact Urban Innovation Capacity? Evidence From Chinese Cities
Creators: name: Yang, Bihong
name: Fan, Fei
name: Zhang, Hong
name: Shao, Xiaoyu
name: Wen, Zilin
Publisher: name: SAGE Publications
Year: 2024

description: As the flow of innovation elements breaks through geographical boundaries, patent transfer has become an important way for cities to enhance their competitive advantages. This study crawls technology transfer data through Big Data mining and uses social network analysis to construct an intercity technology transfer network among 286 Chinese cites at the prefecture-level and above, between 2000–2020. The study explores the influence of technology transfer networks on urban innovation capacity. The results indicate that: (1) Embeddedness of cities in technology transfer networks is conducive to cities acquiring more information and resources through external interactions, thereby promoting urban innovation capability. (2) External knowledge acquisition and knowledge absorption capacity positively moderate the effect of technology transfer networks on urban innovation capacity. (3) A significant spatial correlation exists between technology transfer and innovation activities, and technology transfer networks promote innovation in cities with similar spatial characteristics through spatial knowledge spillover effects.
Induction of superconductivity by sulphur doping in FeTe system and post effect of low temperature oxygen annealing
Creators: name: Awana, V. P. S.
name: Pal, Anand
name: Vajpayee, Arpita
name: Gahtori, Bhasker
name: Kishan, H.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Here, we report the synthesis and characterization of sulphur-substituted iron telluride i.e. FeTe1-xSx; (x = 0-30 %) system and study the impact of low temperature oxygen (O2) annealing as well. Rietveld analysis of room temperature x-ray diffraction (XRD) patterns shows that all the compounds are crystallized in a tetragonal structure (space group P4/nmm) and no secondary phases are observed. Lattice constants are decreased with increasing S concentration. The parent compound of the system i.e. FeTe does not exhibit superconductivity but shows an anomaly in the resistivity measurement at around 78 K, which corresponds to a structural phase transition. Heat capacity Cp(T) measurement also confirms the structural phase transition of FeTe compound. Superconductivity appears by S substitution; the onset of superconducting transition temperature is about 8 K for FeTe0.75S0.25 sample. Thermoelectric power measurements S(T) also shows the superconducting transition at around 7 K for FeTe0.75S0.25 sample. The upper critical fields Hc2(10%), Hc2(50%) and Hc2(90%) are estimated to be 400, 650 and 900 kOe respectively at 0 K by applying Ginzburg Landau (GL) equation. Interestingly, superconducting volume fraction is increased with low temperature (200 oC) O2 annealing at normal pressure. Detailed investigations related to structural (XRD), transport [S(T), R(T)H], magnetization (AC and DC susceptibility) and thermal [Cp(T)] measurements for FeTe1-xS:O2 system are presented and discussed.
description: 19pages text + Figs comments/suggestions welcome (awana@mail.nplindia.ernet.in)
The a priori Tan Theta Theorem for spectral subspaces
Creators: name: Albeverio, Sergio
name: Motovilov, Alexander K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 47A56, 47A62 (Primary) 47B15, 47B49 (Secondary)

description: Let A be a self-adjoint operator on a separable Hilbert space H. Assume that the spectrum of A consists of two disjoint components s_0 and s_1 such that the set s_0 lies in a finite gap of the set s_1. Let V be a bounded self-adjoint operator on H off-diagonal with respect to the partition spec(A)=s_0 \cup s_1. It is known that if ||V||
description: v3: some typos fixed; Examples added
Boundedness of Maximal Operators of Schrödinger Type with Complex Time
Creators: name: Bailey, Andrew D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Analysis of PDEs (math.AP)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42B15, 42B25 (Primary) 42B37 (Secondary)

description: Results of P. Sjölin and F. Soria on the Schrödinger maximal operator with complex-valued time are improved by determining up to the endpoint the sharp $s \geq 0$ for which boundedness from the Sobolev space $H^s(\mathbb{R})$ into $L^2(\mathbb{R})$ occurs. Bounds are established for not only the Schrödinger maximal operator, but further for a general class of maximal operators corresponding to solution operators for certain dispersive PDEs. As a consequence of additional bounds on these maximal operators from $H^s(\mathbb{R})$ into $L^2([-1, 1])$, sharp results on the pointwise almost everywhere convergence of the solutions of these PDEs to their initial data are determined.
description: 12 pages. One further minor correction. To appear in the Revista Matem\'atica Iberoamericana
On the two-dimensional Coulomb-like potential with a central point interaction
Creators: name: Duclos, P.
name: Stovicek, P.
name: Tusek, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In the first part of the paper, we introduce the Hamiltonian $-Δ-Z/\sqrt{x^2+y^2}$, Z>0, as a selfadjoint operator in $L^2(R^2)$. A general central point interaction combined with the two-dimensional Coulomb-like potential is constructed and properties of the resulting one-parameter family of Hamiltonians is studied in detail. The construction is also reformulated in the momentum representation and a relation between the coordinate and the momentum representation is derived. In the second part of the paper we prove that the two-dimensional Coulomb-like Hamiltonian can be derived as a norm resolvent limit of the Hamiltonian of a Hydrogen atom in a planar slab as the width of the slab tends to zero.
"Tails" from the farm : stories of the successes, challenges and barriers of integrating livestock on campus farms and gardens at post-secondary institutions in Canada and the United States
Creators: name: Yuen, Natalie B. A.
Publisher: name: University of British Columbia
Year: 2017

description: This thesis examines the successes, challenges and barriers of integrating livestock on campus farms and gardens at post-secondary institutions in Canada and the United States based on my experience in integrating livestock at the University of British Columbia Farm (Phase I), and the experiences of representatives from other campus farms and gardens that are currently integrating, had integrated, and/or are wanting to integrate livestock (Phase II – Parts 1 and 2). The research methodology in Phase II was guided by the qualitative description approach, with foundational elements of pragmatism and participatory paradigms. Participants were sought via an online survey (Part 1) that was sent to 144 known campus farms and gardens and to the Sustainable Agriculture Education Association (SAEA) listserv. Of the 28 participants that responded to the survey, 22 consented to participate in in-depth, semi-structured interviews (Part 2), which were transcribed and analyzed using qualitative content analysis. Based on the results, the integration of livestock fulfilled the missions of all campus farms and gardens in Phases I and II by providing experiential learning, skill building and engagement opportunities for students, and public demonstrations of alternative livestock production methods (social successes). It also provided many with ecological services, such as nutrient cycling and pest management (ecological successes), and economic diversification and additional revenue (economic successes). Despite the wide array of challenges and barriers due to their applicability to, and the uniqueness of campus farms and gardens, the barriers encountered by campus farms and gardens that are wanting to integrate livestock were also the challenges experienced by those that are integrating (or had integrated) livestock. A comparison of the most frequently cited challenges and barriers revealed four common responses: Labour and Logistics, Institutional System and Support, Animal Ethics Committees, and Space and/or Infrastructure (three of which I experienced in Phase I). I argue that addressing these four challenges/barriers will help to facilitate livestock integration on a majority of campus farms and gardens, and possibly resolve some of the other challenges and barriers connected with them; thereby allowing campus farms and gardens to reap the successes of livestock integration – particularly the social successes.
Measuring Gratitude in Germany: Validation Study of the German Version of the Gratitude Questionnaire-Six Item Form (GQ-6-G) and the Multi-Component Gratitude Measure (MCGM-G)
Creators: name: Hudecek, Matthias
name: Blabst, Nicole
name: Morgan, Blaire
name: Lermer, Eva
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: gratitude, Gratitude Questionnaire-Six Item Form, Multi-Component Gratitude Measure, validation study, confirmatory factor analysis, cultural measurement invariance
subject: 150 Psychologie

description: The Gratitude Questionnaire-Six Item Form (GQ-6; McCullough et al., 2002) is a well-established instrument for measuring gratitude. Recently, the Multi-Component Gratitude Measure (MCGM) was developed as a more holistic approach (Morgan et al., 2017). While the GQ-6 mainly focuses on the emotional component of gratitude, the MCGM encompasses conceptual, attitudinal, and behavioral aspects. As of today, there is no validated German measure for gratitude. In order to close that research gap, the present study focused on validating the German versions of the GQ-6 (GQ-6-G) and of the MCGM (MCGM-G). In addition, multi-group comparisons were conducted to test for cultural measurement invariance. Construct validity was tested similar to original validation studies of the two scales focusing on affect, well-being, empathy, anxiety and depression. The online survey was completed in random order by 508 participants. The one-factor model of the GQ-6-G and the hierarchical structure of the MCGM-G could be replicated. However, the model fit of the Gratitude Questionnaire was significantly better after eliminating one item (GQ-5-G). Multi-group comparisons revealed cultural measurement invariance was established for the GQ-5-G and partial measurement invariance for five of six factors of the MCGM-G, respectively. Reliability analyses revealed good internal consistency for both instruments, and measures for criterion-related and discriminant validity have shown hypothesized relationships. Thus, the GQ-5-G and the MCGM-G are two instruments with good reliability and validity for measuring gratitude in Germany.
User Behaviour in the Wild: Analysing Naturalistic Log Data of a Pedestrian Navigation App.
Creators: name: Jackermeier, Robert
name: Ludwig, Bernd
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: pedestrian navigation, naturalistic study, user behaviour
subject: 020 Bibliotheks- und Informationswissenschaft

description: Knowledge about real-life user behaviour is an important factor for the design of navigation systems. Prompted by the observation that users tend to use our campus navigation app in unexpected ways, we present a naturalistic study of navigation logs. The data set consists of sensor and interaction data from over 4600 sessions, collected over a span of several months from hundreds of users. In our analysis, we demonstrate how the core concepts from navigation literature, i. e. wayfinding and locomotion, can be observed, but also point out differences to previous studies and assumptions. One of our main findings is that the application is mostly used to plan routes in advance, and not to navigate along them. Furthermore, detailed case-studies of actual navigation sessions provide a unique insight into user behaviour and show that persons are often not focused on their navigation task but engaged otherwise. Based on these results, we formulate design implications that do not only apply to future iterations of our application, but can be seen as best practices for pedestrian navigation apps in general.
Entanglement dynamics of two qubits under the influence of external kicks and Gaussian pulses
Creators: name: Altintas, Ferdi
name: Eryigit, Resul
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We have investigated the dynamics of entanglement between two spin-1/2 qubits that are subject to independent kick and Gaussian pulse type external magnetic fields analytically as well as numerically. Dyson time ordering effect on the dynamics is found to be important for the sequence of kicks. We show that "almost-steady" high entanglement can be created between two initially unentangled qubits by using carefully designed kick or pulse sequences.
title: Formação de utilizadores no domínio da Ciência Aberta no contexto da implementação de um sistema CRIS​
Creators: name: Marçal, Bruno
name: Folque, Ana
name: Dias, João Carlos Sebastião
name: Catanho, Cláudia
name: Duque Perdigão, Maria Miguel
Publisher: name: Universidade Católica Portuguesa
Year: 2021

description: A missão das Bibliotecas de Ensino Superior (BES) tem vindo a alinhar-se com os objetivos transversais das suas instituições, em grande medida orientados para os resultados que decorrem da sua atividade ao nível da investigação, bem como para as questões relacionadas com a Ciência Aberta, promovendo a criação de novos serviços. No caso da Universidade Católica Portuguesa, a recente implementação de um sistema CRIS (Current Research Information System), o Ciência-UCP, associado à necessidade de promover junto da sua comunidade um debate participado com vista à criação de uma Política de Ciência Aberta, motivaram o desenvolvimento de algumas atividades formativas.
As referidas ações de formação, estrategicamente realizadas nos meses que antecederam a entrada em produção do novo sistema de gestão de informação científica, abarcaram temas como o Acesso Aberto, Dados de Investigação, Ciência Cidadã ou mesmo a Responsabilidade na Investigação e Inovação, mas também ao nível da gestão de perfil do investigador (CIÊNCIAVITAE, ORCID, Scopus e Web of Science).  De novembro de 2020 a fevereiro de 2021 foram realizadas 16 sessões de formação, dirigidas a investigadores e docentes. Como complemento a estas iniciativas, foram prestados outros serviços de apoio, tais como, sessões de esclarecimento individualizadas e a partilha de diversos materiais informativos.
On the number of Mordell-Weil generators for cubic surfaces
Creators: name: Siksek, Samir
Publisher: name: arXiv
Year: 2010
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14G05, 11G35

description: Let S be a smooth cubic surface over a field K. It is well-known that new K-rational points may be obtained from old ones by secant and tangent constructions. A Mordell-Weil generating set is a subset B of S(K) of minimal cardinality which generates S(K) via successive secant and tangent constructions. Let r(S,K) be the cardinality of such a Mordell-Weil generating set. Manin posed what is known as the Mordell-Weil problem for cubic surfaces: if K is finitely generated over its prime subfield then r(S,K) is finite. In this paper, we prove a special case of this conjecture. Namely, if S contains two skew lines both defined over K then r(S,K) = 1. One of the difficulties in studying the secant and tangent process on cubic surfaces is that it does not lead to an associative binary operation as in the case of elliptic curves. As a partial remedy we introduce an abelian group H_S(K) associated to a cubic surface S/K, naturally generated by the K-rational points, which retains much information about the secant and tangent process. In particular, r(S, K) is large as soon as the minimal number of generators of H_S(K) is large. In situations where weak approximation holds, H_S has nice local-to-global properties. We use these to construct a family of smooth cubic surfaces over the rationals such that r(S,K) is unbounded in this family. This is the cubic surface analogue of the unboundedness of ranks conjecture for elliptic curves.
Hepatitis E Virus Infection: Circulation, Molecular Epidemiology, and Impact on Global Health
Creators: name: Pallerla, Srinivas Reddy
name: Harms, Dominik
name: Johne, Reimar
name: Todt, Daniel
name: Steinmann, Eike
name: Schemmerer, Mathias
name: Wenzel, Jürgen J.
name: Hofmann, Jörg
name: Shih, James Wai Kuo
name: Wedemeyer, Heiner
name: Bock, C.-Thomas
name: Velavan, Thirumalaisamy P.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: hepatitis E; infection; outbreak; epidemiology; global health
subject: 610 Medizin

description: Infection with hepatitis E virus (HEV) represents the most common source of viral hepatitis globally. Although infecting over 20 million people annually in endemic regions, with major outbreaks described since the 1950s, hepatitis E remains an underestimated disease. This review gives a current view of the global circulation and epidemiology of this emerging virus. The history of HEV, from the first reported enteric non-A non-B hepatitis outbreaks, to the discovery of the viral agent and the molecular characterization of the different human pathogenic genotypes, is discussed. Furthermore, the current state of research regarding the virology of HEV is critically assessed, and the challenges towards prevention and diagnosis, as well as clinical risks of the disease described. Together, these points aim to underline the significant impact of hepatitis E on global health and the need for further in-depth research to better understand the pathophysiology and its role in the complex disease manifestations of HEV infection.
On the accuracy of solving confluent Prony systems
Creators: name: Batenkov, Dmitry
name: Yomdin, Yosef
Publisher: name: arXiv
Year: 2011
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 65H10, 41A46, 94A12

description: In this paper we consider several nonlinear systems of algebraic equations which can be called "Prony-type". These systems arise in various reconstruction problems in several branches of theoretical and applied mathematics, such as frequency estimation and nonlinear Fourier inversion. Consequently, the question of stability of solution with respect to errors in the right-hand side becomes critical for the success of any particular application. We investigate the question of "maximal possible accuracy" of solving Prony-type systems, putting stress on the "local" behavior which approximates situations with low absolute measurement error. The accuracy estimates are formulated in very simple geometric terms, shedding some light on the structure of the problem. Numerical tests suggest that "global" solution techniques such as Prony's algorithm and ESPRIT method are suboptimal when compared to this theoretical "best local" behavior.
title: "Labrum, bacino in porfido", arte romana, inv. CLXVI (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Ciccarello, Giulia
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di

Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en