cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
SoHist: A Tool for Managing Technical Debt through Retro Perspective Code Analysis
Creators: name: Dornauer, Benedikt
name: Felderer, Michael
name: Weinzerl, Johannes
name: Racasan, Mircea-Cristian
name: Hess, Martin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Technical debt is often the result of Short Run decisions made during code development, which can lead to long-term maintenance costs and risks. Hence, evaluating the progression of a project and understanding related code quality aspects is essential. Fortunately, the prioritization process for addressing technical debt can be expedited with code analysis tools like the established SonarQube. Unfortunately, we experienced some limitations with this tool and have had some requirements from the industry that were not yet addressed. Through this experience report and the analysis of scientific papers, this work contributes: (1) a reassessment of technical debt within the industry, (2) considers the benefits of employing SonarQube as well as its limitations when evaluating and prioritizing technical debt, (3) introduces a novel tool named SoHist which addresses these limitations and offers additional features for the assessment and prioritization of technical debt, and (4) exemplifies the usage of this tool in two industrial settings in the ITEA3 SmartDelta project.
description: Benedikt Dornauer, Michael Felderer, Johannes Weinzerl, Mircea-Cristian Racasan, and Martin Hess. 2023. SoHist: A Tool for Managing Technical Debt through Retro Perspective Code Analysis. In Proceedings of the International Conference on Evaluation and Assessment in Software Engineering (EASE 23)
title: Rheumatic affections in patients with sickle cell disease in lome.
title: Affections rhumatologiques chez les drepanocytaires majeurs à Lome.
Creators: name: A. Atake
Publisher: name: Revue Marocaine de Rhumatologie (RMR)
Year: 2021
Subjects: Affections rhumatologiques; Drépanocytose majeure; Afrique Noire (Togo).

description: The objective of the study was to determine the frequency and the respective share of the various rheumatic affections observed in the major sickle cell patients in rheumatologic consultation in Lomé. It was a multi-center and descriptive study, between January 2010 and December 2018. Of the 20,852 cases, 115 (69 women; 46 men) met our inclusion criteria, representing a hospital frequency of 0.55%. The H/F sex ratio was 0.67. The average age of the patients was 36.57 - 14.34 years. The SC phenotype was the most represented (71.31%) against (28.69%) SS form. Aseptic osteonecrosis (62 cases; 53.94%), degenerative pathology (35 cases; 30.45%) and infectious pathology (14 cases; 12.18%) were the most observed affections. Sickle cell land was the only risk factor for aseptic osteonecrosis. Rheumatoid arthritis and a bone tumor were associated with sickle cell disease respectively in two (1.74%) patients and one (0.87%) patient. Four (3.48%) patients had H-shaped vertebrae at the standard radiography.
description: L’objectif de l’étude était de déterminer la fréquence et la part respective des différentes affections rhumatologiques observées chez les drépanocytaires majeurs en consultation rhumatologique à Lomé. Elle était multicentrique et descriptive, entre Janvier 2010 et Décembre 2018. Sur les 20.852 dossiers, 115 (69 femmes ; 46 hommes) répondaient à nos critères d’inclusion soit une fréquence hospitalière de 0,55%. Le sex ratio H/F était de 0,67. L’âge moyen des patients était de 36,57 ± 14,34 ans. Le phénotype SC était le plus représenté (71,31%) contre (28,69%) de forme SS. L’ostéonécrose aseptique (62 cas ; 53,94%), la pathologie dégénérative (35 cas ; 30,45%), la pathologie infectieuse (14cas ; 12,18%) ont été les affections les plus observées. Le terrain drépanocytaire était le seul facteur de risque d’ostéonécrose aseptique. La polyarthrite rhumatoïde et une tumeur osseuse étaient associées à la drépanocytose respectivement chez deux (1,74%) patients et un (0,87%) patient. Quatre (3,48%) patients présentaient des vertèbres en H au plan radiographique.
Sparsity with sign-coherent groups of variables via the cooperative-Lasso
Creators: name: Chiquet, Julien
name: Grandvalet, Yves
name: Charbonnier, Camille
Publisher: name: arXiv
Year: 2011
Subjects: subject: Methodology (stat.ME)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: We consider the problems of estimation and selection of parameters endowed with a known group structure, when the groups are assumed to be sign-coherent, that is, gathering either nonnegative, nonpositive or null parameters. To tackle this problem, we propose the cooperative-Lasso penalty. We derive the optimality conditions defining the cooperative-Lasso estimate for generalized linear models, and propose an efficient active set algorithm suited to high-dimensional problems. We study the asymptotic consistency of the estimator in the linear regression setup and derive its irrepresentable conditions, which are milder than the ones of the group-Lasso regarding the matching of groups with the sparsity pattern of the true parameters. We also address the problem of model selection in linear regression by deriving an approximation of the degrees of freedom of the cooperative-Lasso estimator. Simulations comparing the proposed estimator to the group and sparse group-Lasso comply with our theoretical results, showing consistent improvements in support recovery for sign-coherent groups. We finally propose two examples illustrating the wide applicability of the cooperative-Lasso: first to the processing of ordinal variables, where the penalty acts as a monotonicity prior; second to the processing of genomic data, where the set of differentially expressed probes is enriched by incorporating all the probes of the microarray that are related to the corresponding genes.
description: Published in at http://dx.doi.org/10.1214/11-AOAS520 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Moduli of vortices and Grassmann manifolds
Creators: name: Biswas, Indranil
name: Romão, Nuno M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Algebraic Geometry (math.AG)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 14H60, 53C07

description: We use the framework of Quot schemes to give a novel description of the moduli spaces of stable n-pairs, also interpreted as gauged vortices on a closed Riemann surface with target Mat(r x n, C), where n >= r. We then show that these moduli spaces embed canonically into certain Grassmann manifolds, and thus obtain natural Kaehler metrics of Fubini-Study type; these spaces are smooth at least in the local case r=n. For abelian local vortices we prove that, if a certain "quantization" condition is satisfied, the embedding can be chosen in such a way that the induced Fubini-Study structure realizes the Kaehler class of the usual L^2 metric of gauged vortices.
description: 22 pages, LaTeX. Final version: last section removed, typos corrected, two references added; to appear in Commun. Math. Phys
New Bistable Solutions in Molecular Cloud Chemistry: Nitrogen and Carbon Autocatalysis
Creators: name: Gwenaëlle, Dufour
name: Charnley, Steven B.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have investigated the chemistry of dense interstellar clouds and found new bistable solutions in the nitrogen and carbon chemistries. We identify the autocatalytic processes that are present in the pure, reduced, chemical networks and, as previously found for oxygen chemistry, that He$^+$ plays an important role. The applicability of these results to astronomical environments is briefly discussed. The bistable solutions found for carbon chemistry occur for low densities and high ionization fractions that are not compatible with that found cold, dense clouds. Bistability in the pure nitrogen chemistry occurs for conditions that are relevant for prestellar cores in which significant CO depletion has taken place. We conclude that several autocatalyses are embedded in gas-phase interstellar chemistry and that many more are potentially present.
description: 12 pages, 5 figures, 1 table
Evolution of fNL to the adiabatic limit
Creators: name: Elliston, Joseph
name: Mulryne, David J.
name: Seery, David
name: Tavakol, Reza
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study inflationary perturbations in multiple-field models, for which zeta typically evolves until all isocurvature modes decay--the "adiabatic limit". We use numerical methods to explore the sensitivity of the nonlinear parameter fNL to the process by which this limit is achieved, finding an appreciable dependence on model-specific data such as the time at which slow-roll breaks down or the timescale of reheating. In models with a sum-separable potential where the isocurvature modes decay before the end of the slow-roll phase we give an analytic criterion for the asymptotic value of fNL to be large. Other examples can be constructed using a waterfall field to terminate inflation while fNL is transiently large, caused by descent from a ridge or convergence into a valley. We show that these two types of evolution are distinguished by the sign of the bispectrum, and give approximate expressions for the peak fNL.
description: v1: 25 pages, plus Appendix and bibliography, 6 figures. v2: minor edits to match published version in JCAP
Precision determination of r_0Lambda_MS from the QCD static energy
Creators: name: Brambilla, Nora
name: Tormo, Xavier Garcia i
name: Soto, Joan
name: Vairo, Antonio
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We use the recently obtained theoretical expression for the complete QCD static energy at next-to-next-to-next-to leading-logarithmic accuracy to determine r_0Lambda_MS by comparison with available lattice data, where r_0 is the lattice scale and Lambda_MS is the QCD scale. We obtain r_0Lambda_MS=0.637^{+0.032}_{-0.030} for the zero-flavor case. The procedure we describe can be directly used to obtain r_0Lambda_MS in the unquenched case, when unquenched lattice data for the static energy at short distances becomes available. Using the value of the strong coupling alpha_s as an input, the unquenched result would provide a determination of the lattice scale r_0.
description: 5 pages, 2 figures. v2: Minor changes. One reference added. Journal version. v3: Mistake in the numerical implementation corrected. v4: Abstract in metadata corrected
FastqPuri: high-performance preprocessing of RNA-seq data
Creators: name: Perez-Rubio, Paula
name: Lottaz, Claudio
name: Engelmann, Julia C.
Publisher: name: Universität Regensburg
Year: 2018
Subjects: subject: 610 Medizin

description: Background RNA sequencing (RNA-seq) has become the standard means of analyzing gene and transcript expression in high-throughput. While previously sequence alignment was a time demanding step, fast alignment methods and even more so transcript counting methods which avoid mapping and quantify gene and transcript expression by evaluating whether a read is compatible with a transcript, have led to significant speed-ups in data analysis. Now, the most time demanding step in the analysis of RNA-seq data is preprocessing the raw sequence data, such as running quality control and adapter, contamination and quality filtering before transcript or gene quantification. To do so, many researchers chain different tools, but a comprehensive, flexible and fast software that covers all preprocessing steps is currently missing. Results We here present FastqPuri, a light-weight and highly efficient preprocessing tool for fastq data. FastqPuri provides sequence quality reports on the sample and dataset level with new plots which facilitate decision making for subsequent quality filtering. Moreover, FastqPuri efficiently removes adapter sequences and sequences from biological contamination from the data. It accepts both single- and paired-end data in uncompressed or compressed fastq files. FastqPuri can be run stand-alone and is suitable to be run within pipelines. We benchmarked FastqPuri against existing tools and found that FastqPuri is superior in terms of speed, memory usage, versatility and comprehensiveness. Conclusions: FastqPuri is a new tool which covers all aspects of short read sequence data preprocessing. It was designed for RNA-seq data to meet the needs for fast preprocessing of fastq data to allow transcript and gene counting, but it is suitable to process any short read sequencing data of which high sequence quality is needed, such as for genome assembly or SNV (single nucleotide variant) detection. FastqPuri is most flexible in filtering undesired biological sequences by offering two approaches to optimize speed and memory usage dependent on the total size of the potential contaminating sequences. FastqPuri is available at https://github.com/jengelmann/FastqPuri. It is implemented in C and R and licensed under GPL v3.
Neutralino and chargino masses and related sum rules beyond MSSM
Creators: name: Huitu, Katri
name: Pandita, P. N.
name: Tiitola, Paavo
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the implications of dimension five operators involving Higgs chiral superfields for the masses of neutralinos and charginos in the minimal supersymmetric standard model (MSSM). These operators can arise from additional interactions beyond those of MSSM involving new degrees of freedom at or above the TeV scale. In addition to the masses of the neutralinos and charginos, we study the sum rules involving the masses and squared masses of these particles for different gaugino mass patterns in presence of the dimension five operators in the context of MSSM. We derive a relation for the higgsino mixing mass parameter and $\tanβ$ in the presence of the dimension five operators.
description: 16 pages, 7 figures, title changed, discussion of an alternative sum rule and error analysis added, first two sections shortened. Version submitted to PLB
Model Independent Determination of the Gluon Condensate in Four Dimensional SU(3) Gauge Theory
Creators: name: Bali, Gunnar S.
name: Bauer, Clemens
name: Pineda, Antonio
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: We determine the nonperturbative gluon condensate of four-dimensional SU(3) gauge theory in a model-independent way. This is achieved by carefully subtracting high-order perturbation theory results from nonperturbative lattice QCD determinations of the average plaquette. No indications of dimension-two condensates are found. The value of the gluon condensate turns out to be of a similar size as the intrinsic ambiguity inherent to its definition. We also determine the binding energy of a B meson in the heavy quark mass limit.
Harmonic analysis on spherical homogeneous spaces with solvable stabilizer
Creators: name: Avdeev, Roman
name: Gorfinkel, Natalia
Publisher: name: arXiv
Year: 2011
Subjects: subject: Representation Theory (math.RT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 20G05, 22E46, 43A85, 14M27, 14M17

description: For all spherical homogeneous spaces G/H, where G is a simply connected semisimple algebraic group and H a connected solvable subgroup of G, we compute the spectra of the representations of G on spaces of regular sections of homogeneous line bundles over G/H.
description: v2: 14 pages, minor corrections
Another big ditch : the prospect of a Nicaragua Canal
Creators: name: Jewell, Kendra
Publisher: name: University of British Columbia
Year: 2017

description: In this thesis, I analyze the impacts of infrastructures that have been approved but are not yet constructed. Specifically, I show how the Nicaragua Canal – a mega-infrastructure project owned by a Chinese investment firm and pushed through by the Nicaraguan government – haunts resident peoples in both its non-present presence, and in its propensity to exhume a painful social past. In calling the Nicaragua Canal a “ghost,” a “chimera,” and a “smoke screen,” resident peoples communicate the illusory quality of infrastructures that remain stuck in the preconstruction phase. And yet the many ways in which the Nicaragua Canal is currently affecting resident peoples demonstrate the very real power it has, even when it does not yet exist in the material world. Given this, I engage Derrida’s concept of the specter to examine the impacts of infrastructures that are yet-to-be. With insights gained through fieldwork conducted in Nicaragua from May to August of 2016, I analyze what happens in the liminal spaces of infrastructural development – in the time lag between approval and construction – and especially how potentially affected peoples are experiencing the spectrality of the Nicaragua Canal.
Reststrahl band-assisted photocurrents in epitaxial graphene layers
Creators: name: Olbrich, Peter
name: Drexler, Christoph
name: Golub, Leonid E.
name: Danilov, Sergey N.
name: Shalygin, V. A.
name: Yakimova, R.
name: Lara-Avila, S.
name: Kubatkin, S.
name: Redlich, B.
name: Huber, Rupert
name: Ganichev, Sergey
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 530 Physik

description: We report on the observation of the reststrahl band-assisted photocurrents in epitaxial graphene on SiC excited by infrared radiation. The peculiar spectral dependence for frequencies lying within the reststrahl band of the SiC substrate provides a direct and noninvasive way to probe the electric field magnitude at atomic distances from the material's surface. Furthermore our results reveal that nonlinear optical and optoelectronic phenomena in two-dimensional crystals and other atomic scale structures can be giantly enhanced by their deposition on a substrate with negative dielectric constant.
Symmetry and Complexity in Object-Centric Deep Active Inference Models
Creators: name: Ferraro, Stefano
name: Van de Maele, Toon
name: Verbelen, Tim
name: Dhoedt, Bart
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Humans perceive and interact with hundreds of objects every day. In doing so, they need to employ mental models of these objects and often exploit symmetries in the object's shape and appearance in order to learn generalizable and transferable skills. Active inference is a first principles approach to understanding and modeling sentient agents. It states that agents entertain a generative model of their environment, and learn and act by minimizing an upper bound on their surprisal, i.e. their Free Energy. The Free Energy decomposes into an accuracy and complexity term, meaning that agents favor the least complex model, that can accurately explain their sensory observations. In this paper, we investigate how inherent symmetries of particular objects also emerge as symmetries in the latent state space of the generative model learnt under deep active inference. In particular, we focus on object-centric representations, which are trained from pixels to predict novel object views as the agent moves its viewpoint. First, we investigate the relation between model complexity and symmetry exploitation in the state space. Second, we do a principal component analysis to demonstrate how the model encodes the principal axis of symmetry of the object in the latent space. Finally, we also demonstrate how more symmetrical representations can be exploited for better generalization in the context of manipulation.
SURF 2024 Juan Castillo - Targeting HMGB1 – Understanding the Epigenetic Mechanisms Underlying Reversible Loss of Serotonergic Neurons
Creators: name: Castillo, Juan
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2024

description: Alcohol abuse in early adolescence has been shown to lead to a decrease of raphe nucleus serotonergic neurons, which are neurons that regulate mood, social interactions, and sleep among other essential bodily functions. Our lab has shown that adolescent intermittent ethanol (AIE) exposure increases neuroinflammation through the HMGB1 receptor signaling through toll-like receptors (TLRs). This increase of HMGB1-related neuroinflammation causes a decrease of RNSNs. Previous research from our lab has also shown that these changes are reversible through post-AIE exposure exercise. I hypothesized that glycyrrhizic acid – an HMGB1 inhibitor – would reverse the loss of RNSNs caused by HGMB1-mediated neuroinflammation
Nonlinear Scattering of a Bose-Einstein Condensate on a Rectangular Barrier
Creators: name: Carr, Lincoln D.
name: Miller, Rachel R.
name: Bolton, Daniel R.
name: Strong, Scott A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We consider the nonlinear scattering and transmission of an atom laser, or Bose-Einstein condensate (BEC) on a finite rectangular potential barrier. The nonlinearity inherent in this problem leads to several new physical features beyond the well-known picture from single-particle quantum mechanics. We find numerical evidence for a denumerably infinite string of bifurcations in the transmission resonances as a function of nonlinearity and chemical potential, when the potential barrier is wide compared to the wavelength of oscillations in the condensate. Near the bifurcations, we observe extended regions of near-perfect resonance, in which the barrier is effectively invisible to the BEC. Unlike in the linear case, it is mainly the barrier width, not the height, that controls the transmission behavior. We show that the potential barrier can be used to create and localize a dark soliton or dark soliton train from a phonon-like standing wave.
description: 15 pages, 15 figures, new version includes clarification of definition of transmission coefficient in general nonlinear vs. linear case
Modeling sporadic amyotrophic lateral sclerosis (sals) in zebrafish using environmental stressors
Creators: name: Morrice, Jessica Rebecca Marie
Publisher: name: University of British Columbia
Year: 2017

description: Amyotrophic lateral sclerosis (ALS) is characterized by the progressive degeneration of upper and lower motor neurons. The majority of ALS patients are considered of unknown origin, termed sporadic, and are largely assumed to arise from environmental insults. Despite this, research to date has been heavily focused on genetic models of the disease, which represent 10% of ALS cases. Research has made disappointing progress with elucidating disease initiating mechanisms and therapeutic translation in patients. Sporadic ALS (sALS) models may provide substantially more applicable insight into disease pathogenesis, however there is currently a lack of reliable and effective models. Zebrafish offer promising advantages to investigating ALS, with highly conserved biological processes to humans, including genes implicated in human neurodegenerative diseases. Further, they can be used for high throughput toxicity screening and are optically transparent as embryos to allow for high resolution imaging in vivo. Here, we investigate using zebrafish as a model for screening for motor neuron defects and hypothesize that exposure to particular environmental toxins can be used to induce ALS-like hallmarks in a zebrafish model. We find that the zebrafish is an efficient and effective model for screening motor neuron toxicity induced by neurotoxins and Bisphenol A (BPA) exposure has a clear dose-response effect on reduced motor neuron length and branching in embryos at 48 hours post fertilization (hpf). We provide evidence that motor axon length as a valid surrogate marker of motor neuron degeneration by confirming the conventional method of measuring the length from a sagittal view in defective motor axons represents their true length in 3 dimensions, and confirm that reduced motor axon length is associated with increased motor neuron death. Further, BPA exposure results in an ALS-like phenotype with reduced motor function at 24 and 48 hpf, reduced neuromuscular junction integrity and microglia activation in embryos at 48 hpf. Together, these results show that the zebrafish model is advantageous for screening toxin-induced motor neuron death and can be used as a valid model of sALS. This research can be extended to confirm ALS-associated neurotoxins and provide insight into pathogenic mechanisms of sALS.
Running coupling and theΛparameter from SU(3) lattice simulations
Creators: name: Bali, Gunnar S.
name: Schilling, Klaus
Publisher: name: Universität Regensburg
Year: 1993
Subjects: subject: 530 Physik

description: We present new results on the static q¯q potential from high-statistics simulations on 324 and smaller lattices, using the standard Wilson action at β=6.0, 6.4, and 6.8 on the Connection Machine CM-2. Within our statistical errors (≈ 1%) we do not observe any finite-size effects affecting the potential values, on varying the spatial lattice extent from 0.9 fm up to 3.3 fm. We are able to see and quantify the running of the coupling from the Coulomb behavior of the interquark force. From this we extract the ratio √σΛL. We demonstrate that scaling violations on the string tension can be considerably reduced by introducing effective coupling schemes, which allow for a safe extrapolation of ΛL to its continuum value. Both methods yield consistent values for Λ:Λ–––––MS=0.555+0.019−0.017×√σ=244+8−7 MeV, where –––––MS denotes the modified minimal subtraction scheme. At the highest-energy scale attainable to us we find α(5 GeV)=0.150(3).
Laser-induced modulation of the Landau level structure in single-layer graphene
Creators: name: López, Alexander
name: Di Teodoro, Antonio
name: Schliemann, John
name: Berche, Bertrand
name: Santos, Benjamin
Publisher: name: Universität Regensburg
Year: 2015
Subjects: subject: 530 Physik

description: We present perturbative analytical results of the Landau level quasienergy spectrum, autocorrelation function, and out-of-plane pseudospin polarization for a single graphene sheet subject to intense circularly polarized Terahertz radiation. For the quasienergy spectrum, we find a striking nontrivial level-dependent dynamically induced gap structure. This photoinduced modulation of the energy band structure gives rise to shifts of the revival times in the autocorrelation function and it also leads to modulation of the oscillations in the dynamical evolution of the out-of-plane pseudospin polarization, which measures the angular momentum transfer between light and graphene electrons. For a coherent state, chosen as an initial pseudospin configuration, the dynamics induces additional quantum revivals of the wave function that manifest as shifts of the maxima and minima of the autocorrelation function, with additional partial revivals and beating patterns. These additional maxima and beating patterns stem from the effective dynamical coupling of the static eigenstates. We discuss the possible experimental detection schemes of our theoretical results and their relevance in new practical implementation of radiation fields in graphene physics.
title: "Statua di Atena", arte romana, inv. CLXXXIII (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Clementi, Jessica
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
Calculus and heat flow in metric measure spaces and applications to spaces with Ricci bounds from below
Creators: name: Ambrosio, Luigi
name: Gigli, Nicola
name: Savaré, Giuseppe
Publisher: name: arXiv
Year: 2011
Subjects: subject: Metric Geometry (math.MG)
subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 52C23, 49J52, 49Q20, 58J35, 35K90, 31C25

description: This paper is devoted to a deeper understanding of the heat flow and to the refinement of calculus tools on metric measure spaces (X,d,m). Our main results are: - A general study of the relations between the Hopf-Lax semigroup and Hamilton-Jacobi equation in metric spaces (X,d). - The equivalence of the heat flow in L^2(X,m) generated by a suitable Dirichlet energy and the Wasserstein gradient flow of the relative entropy functional in the space of probability measures P(X). - The proof of density in energy of Lipschitz functions in the Sobolev space W^{1,2}(X,d,m). - A fine and very general analysis of the differentiability properties of a large class of Kantorovich potentials, in connection with the optimal transport problem. Our results apply in particular to spaces satisfying Ricci curvature bounds in the sense of Lott & Villani [30] and Sturm [39,40], and require neither the doubling property nor the validity of the local Poincaré inequality.
description: Minor typos corrected and many small improvements added. Lemma 2.4, Lemma 2.10, Prop. 5.7, Rem. 5.8, Thm. 6.3 added. Rem. 4.7, Prop. 4.8, Prop. 4.15 and Thm 4.16 augmented/reenforced. Proof of Thm. 4.16 and Lemma 9.6 simplified. Thm. 8.6 corrected. A simpler axiomatization of weak gradients, still equivalent to all other ones, has been proposed
Analysis of quantum coherence in bismuth-doped silicon: a system of strongly coupled spin qubits
Creators: name: Mohammady, M. H.
name: Morley, G. W.
name: Nazir, A.
name: Monteiro, T. S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: There is growing interest in bismuth-doped silicon (Si:Bi) as an alternative to the well-studied proposals for silicon based quantum information processing (QIP) using phosphorus-doped silicon (Si:P). We focus here on the implications of its anomalously strong hyperfine coupling. In particular, we analyse in detail the regime where recent pulsed magnetic resonance experiments have demonstrated the potential for orders of magnitude speedup in quantum gates by exploiting transitions that are electron paramagnetic resonance (EPR) forbidden at high fields. We also present calculations using a phenomenological Markovian master equation which models the decoherence of the electron spin due to Gaussian temporal magnetic field perturbations. The model quantifies the advantages of certain "optimal working points" identified as the $df/dB=0$ regions, where $f$ is the transition frequency, which come in the form of frequency minima and maxima. We show that at such regions, dephasing due to the interaction of the electron spin with a fluctuating magnetic field in the $z$ direction (usually adiabatic) is completely removed.
description: 15 pages, 9 figures
Model Explainability in Physiological and Healthcare-based Neural Networks
Creators: name: Sharma, Rohit
name: Gupta, Abhinav
name: Gupta, Arnav
name: Li, Bo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: The estimation and monitoring of SpO2 are crucial for assessing lung function and treating chronic pulmonary diseases. The COVID-19 pandemic has highlighted the importance of early detection of changes in SpO2, particularly in asymptomatic patients with clinical deterioration. However, conventional SpO2 measurement methods rely on contact-based sensing, presenting the risk of cross-contamination and complications in patients with impaired limb perfusion. Additionally, pulse oximeters may not be available in marginalized communities and undeveloped countries. To address these limitations and provide a more comfortable and unobtrusive way to monitor SpO2, recent studies have investigated SpO2 measurement using videos. However, measuring SpO2 using cameras in a contactless way, particularly from smartphones, is challenging due to weaker physiological signals and lower optical selectivity of smartphone camera sensors. The system includes three main steps: 1) extraction of the region of interest (ROI), which includes the palm and back of the hand, from the smartphone-captured videos; 2) spatial averaging of the ROI to produce R, G, and B time series; and 3) feeding the time series into an optophysiology-inspired CNN for SpO2 estimation. Our proposed method can provide a more efficient and accurate way to monitor SpO2 using videos captured from consumer-grade smartphones, which can be especially useful in telehealth and health screening settings.
Static quark-antiquark potential: Scaling behavior and finite-size effects in SU(3) lattice gauge theory
Creators: name: Bali, Gunnar S.
name: Schilling, K.
Publisher: name: Universität Regensburg
Year: 1992
Subjects: subject: 530 Physik

description: We present results on the static q¯q potential from high-statistics simulations on 164, 243×32, and 324 lattices, using the standard Wilson action at β=6.0,6.2, and 6.4 on the Connection Machine CM2. To decrease noise and increase accuracy, we applied a suitable local smoothing technique on the spatial parts of Wilson loop operators. As a result, we find a violation of asymptotic scaling of the string tension, as signaled by √σΛL=96.7(1.6)(2.6),86.4(1.0)(1.9),82.3(0.8)(1.7), for the three β values, with statistical and systematic errors. We observe a linear confining potential up to distances of 2 fm. A volume of (1.5fm)3 appears to be sufficient to avoid finite-size effects within our statistical accuracy (≅ 1%).
A comprehensive lattice study of SU(3) glueballs
Creators: name: Bali, Gunnar S.
name: Schilling, K.
name: Hulsebos, A.
name: Irving, A. C.
name: Michael, C.
name: Stephenson, P. W.
Publisher: name: Universität Regensburg
Year: 1993
Subjects: subject: 530 Physik

description: We present a study of the SU(3) glueball spectrum for all JPC values at lattice spacings down to a−1 = 3.73(6) GeV (β = 6.4) using lattices of size up to 324. We extend previous studies and show that the continuum limit has effectively been reached. The number of clearly identified JPC states has been substantially increased. There are no clear signals for spin-exotic glueballs below 3 GeV. A comparison with current experimental glueball candidates is made.
Spatial string tension in the deconfined phase of (3+1)-dimensional SU(2) gauge theory
Creators: name: Bali, Gunnar S.
name: Fingberg, J.
name: Heller, U. M.
name: Karsch, F.
name: Schilling, K.
Publisher: name: Universität Regensburg
Year: 1993
Subjects: subject: 530 Physik

description: We present results of a detailed investigation of the temperature dependence of the spatial string tension in SU(2) gauge theory. We show, for the first time, that the spatial string tension is scaling on the lattice and thus is nonvanishing in the continuum limit. It is temperature independent below Tc and rises rapidly above. For temperatures larger than 2Tc we find a scaling behavior consistent with σs(T)=(0.136±0.011)g4(T)T2, where g(T) is the two-loop running coupling constant with a scale parameter determined as ΛT=(0.076±0.013)Tc.
Angular momentum exchange during secular migration of two-planet systems
Creators: name: Rodríguez, Adrián
name: Michtchenko, Tatiana A.
name: Miloni, Octavio
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We investigate the secular dynamics of two-planet coplanar systems evolving under mutual gravitational interactions and dissipative forces. We consider two mechanisms responsible for the planetary migration: star-planet (or planet-satellite) tidal interactions and interactions of a planet with a gaseous disc. We show that each migration mechanism is characterized by a specific law of orbital angular momentum exchange. Calculating stationary solutions of the conservative secular problem and taking into account the orbital angular momentum leakage, we trace the evolutionary routes followed by the planet pairs during the migration process. This procedure allows us to recover the dynamical history of two-planet systems and constrain parameters of the involved physical processes.
description: 20 pages, 9 figures, accepted for publication in Celestial Mechanics and Dynamical Astronomy (special issue on Exoplanets)
FAKTOR YANG MENDUKUNG SEORANG MENJADI WIRAUSAHWAN
Creators: name: Pratiwi, Ade Rizky
Publisher: name: Zenodo
Year: 2022

description: Tugas UAS Makul Kewirausahaan, Makalah Individu, Ade Rizky Pratiwi (11812037), PBA Kelas B Semester 7, Dosen Pengampu : Dr Fachrurazi, S.Ag., MM. dan Yulida, MM.
On L_p- theory for stochastic parabolic integro-differential equations
Creators: name: Mikulevicius, R.
name: Pragarauskas, H.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 60H15, 60H20 (Primary) 35S10, 45K05, 35R60 (Secondary)

description: The existence and uniqueness in fractional Sobolev spaces of the Cauchy problem to a stochastic parabolic integro-differential equation is investigated. A model problem with coefficients independent of space variable is considered. The equation arises, for example, in a filtering problem with a jump signal and jump observation process.
Baryonic and mesonic 3-point functions with open spin indices
Creators: name: Della Morte, M.
name: Bali, Gunnar S.
name: Collins, Sara
name: Gläßle, Benjamin
name: Heybrock, Simon
name: Korcyl, Piotr
name: Löffler, Marius
name: Rödl, Rudolf
name: Schäfer, Andreas
name: Fritzsch, P.
name: Gámiz Sánchez, E.
name: Pena Ruano, C.
Publisher: name: Universität Regensburg
Year: 2018
Subjects: subject: 530 Physik

description: We have implemented a new way of computing three-point correlation functions. It is based on a factorization of the entire correlation function into two parts which are evaluated with open spin-(and to some extent flavor-) indices. This allows us to estimate the two contributions simultaneously for many different initial and final states and momenta, with little computational overhead. We explain this factorization as well as its efficient implementation in a new library which has been written to provide the necessary functionality on modern parallel architectures and on CPUs, including Intel’s Xeon Phi series.
Quantitative scanning spreading resistance microscopy on n-type dopant diffusion profiles in germanium and the origin of dopant deactivation
Creators: name: Prüßing, Jan K.
name: Hamdana, Gerry
name: Bougeard, Dominique
name: Peiner, Erwin
name: Bracht, Hartmut
Publisher: name: Universität Regensburg
Year: 2019
Subjects: subject: 530 Physik

description: Diffusion profiles of arsenic and antimony in undoped and carbon doped germanium (Ge), respectively, were analysed by means of scanning spreading resistance microscopy (SSRM). Whereas earlier secondary ion mass spectrometry analyses have determined the distribution of the chemical concentration of dopants and carbon, the electrically active defect concentration is quantified by SSRM using appropriate calibration samples and a preparation technique that reduces the surface roughness and its density of electronic states. Pronounced differences between the chemical and electrical dopant profiles are observed and consistently described by the formation of inactive dopant defect complexes in the framework of the vacancy mediated diffusion of donor atoms in Ge. This reveals that donor deactivation occurs during dopant diffusion at elevated temperatures.
A Novel Structure for Double Negative NIMs towards UV Spectrum with High FOM
Creators: name: Tang, Jianwei
name: He, Sailing
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A novel ring structure is proposed for double negative NIMs at visible light spectrum with high FOM (e.g. about 11 at a wavelength of 583 nm) and low loss. Besides the effective medium theory, an equivalent circuit model is also given to explain physically why our novel structure can give double negative behavior with low loss. Adapted from the original ring structure, two other types of structures, namely, disk and nanowire structures, are also given to further push double negative NIMs toward ultraviolet (UV) spectrum.
N=4 Extended MSSM
Creators: name: Antola, Matti
name: Di Chiara, Stefano
name: Sannino, Francesco
name: Tuominen, Kimmo
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate a perturbative N=4 sector coupled to the MSSM and show that it allows for a stable vacuum correctly breaking the electroweak symmetry. The particle spectrum of the MSSM is enrichened by several new particles stemming out from the new N=4 sector of the theory, and a new lepton doublet required to cancel global and gauge anomalies of the theory. Even if the conformal invariance of the N=4 sector is explicitly broken, a nontrivial UV behavior of the coupling constants is possible: by studying the renormalization group equations at two loops we find that the Yukawa couplings of the heavy fermionic states flow to a common fixed point at a scale of a few TeVs. The parameter space of the new theory is reduced imposing naturalness of the couplings and soft supersymmetry breaking masses, perturbativity of the model at the EW scale as well as phenomenological constraints. Our preliminary results on the spectrum of the theory suggest that the LHC can rule out a significant portion of the parameter space of this model.
description: 22 pages, 2 figures
Regulation of gingival fibroblast gene expression by leukocyte and platelet rich fibrin
Creators: name: Barona Intriago, Maria Fernanda
Publisher: name: University of British Columbia
Year: 2017

description: Objectives: Leukocyte and Platelet-Rich Fibrin (L-PRF), a new clinically used blood product, is rich in leukocytes and platelets embedded in a high-density fibrin network. L-PRF has shown some clinical promise to promote gingival wound healing. In gingival surgeries where L-PRF is being used, it will be in direct contact with human gingival fibroblasts (HGFs) of the surgical flap. However, little is known about the combined effects of the growth factors and cells present in L-PRF on HGFs. We hypothesized that L-PRF regulates expression of key wound healing genes in HGFs. Thus, our aim was to investigate the effects of soluble biological factors released from L-PRF on HGF gene expression. Methods: L-PRF membranes were produced from blood samples of six volunteer donors using standard clinical protocol. The membranes were placed into upper compartments of transwell plate inserts (0.4 µm pore size) with confluent layers of HGFs at the bottom of the wells. Thus, only soluble mediators were able to influence HGF gene expression. HGFs with the L-PRF membranes in the wells were incubated for 48h followed by isolation of total RNA for real-time quantitative PCR of wound healing related genes. The levels of selected proteins produced by the cells were analyzed using Western blotting. Results: Among the 86 genes studied, the expression of 35 genes (41%) was significantly regulated by the L-PRF membranes in HGFs. Replicate membranes from the same donor or between different donors produced similar responses, with membranes from different individuals varying somewhat in magnitude of the response. Among the most regulated genes, matrix metalloproteinase-1 (MMP-1) and MMP-3 showed several-fold increase by L-PRF-treatment, both at the mRNA and protein level. Angiogenesis related genes, VEGF-α and FGF-2 showed also significant up-regulation in HGFs by the L-PRF-treatment. Conclusions: The results demonstrate that the L-PRF membranes have a strong and a specific regulatory effect on HGFs that may modulate several aspects of wound healing.
Spectral focusing of broadband silver electroluminescence in nanoscopic FRET-LEDs
Creators: name: Puchert, Robin P.
name: Steiner, Florian
name: Plechinger, Gerd
name: Hofmann, Felix J.
name: Caspers, Ines
name: Kirschner, Johanna
name: Nagler, Philipp
name: Chernikov, Alexey
name: Schüller, Christian
name: Korn, Tobias
name: Vogelsang, Jan
name: Bange, Sebastian
name: Lupton, John M.
Publisher: name: Universität Regensburg
Year: 2017
Subjects: subject: 530 Physik

description: Few inventions have shaped the world like the incandescent bulb. Edison used thermal radiation from ohmically heated conductors, but some noble metals also exhibit ‘cold’ electroluminescence in percolation films1,2, tunnel diodes3, electromigrated nanoparticle aggregates4,5, optical antennas6 or scanning tunnelling microscopy7,8,9. The origin of this radiation, which is spectrally broad and depends on applied bias, is controversial given the low radiative yields of electronic transitions. Nanoparticle electroluminescence is particularly intriguing because it involves localized surface-plasmon resonances with large dipole moments. Such plasmons enable very efficient non-radiative fluorescence resonance energy transfer (FRET) coupling to proximal resonant dipole transitions. Here, we demonstrate nanoscopic FRET–light-emitting diodes which exploit the opposite process, energy transfer from silver nanoparticles to exfoliated monolayers of transition-metal dichalcogenides10. In diffraction-limited hotspots showing pronounced photon bunching, broadband silver electroluminescence is focused into the narrow excitonic resonance of the atomically thin overlayer. Such devices may offer alternatives to conventional nano-light-emitting diodes11 in on-chip optical interconnects.
Tuning the dimensionality of organometallic-organic hybrid polymers assembled from [Cp₂Mo₂(CO)₄(η²-P₂)], rigid bipyridyl linkers and Ag ions
Creators: name: Moussa, Medhi Elsayed
name: Peresypkina, Eugenia V.
name: Virovets, Alexander V.
name: Venus, Dominik
name: Balazs, Gabor
name: Scheer, Manfred
Publisher: name: Universität Regensburg
Year: 2018
Subjects: subject: 540 Chemie

description: The reactions of the P₂ ligand complex [Cp₂Mo₂(CO)₄(η²-P₂)] (Cp = C₅H₅, 1) with Ag[Al{OC(CF₃)₃}₄] (Ag[TEF]) in the presence of the rigid bipyridyl linkers 1,2-di(pyridin-4-yl)ethyne (3), 4,4′-bis(pyridin-4-ylethynyl)-1,1′-biphenyl (4) and 4,4′-bipyridine (5) possessing various lengths are studied. The reaction with the longer linkers (3 and 4) leads to the formation of the 1D organometallic–organic hybrid polymers [{Cp₂Mo₂(CO)₄(μ₄,η¹˸¹˸²˸²-P₂)}₂{Cp₂Mo₂(CO)₄(μ₃,η¹˸²˸²-P₂)}₂(μ,η¹˸¹-C₁₂H₈N₂)Ag₂]n[TEF]₂n (6) and [{Cp₂Mo₂(CO)₄(μ₄,η¹˸¹˸²˸²-P₂)}₂{Cp₂Mo₂(CO)₄(μ₃,η¹˸²˸²-P₂)}₂(μ,η¹˸¹-C₂₆H₁₆N₂)Ag₂]n[TEF]₂n (7) in high selectivity. A similar reaction with the short linker 5 affords a mixture of the 2D hybrid polymers [{Cp₂Mo₂(CO)₄(μ₄,η¹˸²˸²˸²-P₂)}₂(μ,η¹˸¹-C₁₃H₁₄N₂)Ag₂]n[TEF]₂n (8) and the 3D hybrid network [{Cp₂Mo₂(CO)₄(μ₄,η¹˸¹˸²:²-P₂)}₂(μ,η¹˸¹-C10H8N₂)Ag]n[TEF]₂n (9). However, a selective synthesis of 8 or 9 is possible when the reaction is performed at 0 °C and 60 °C, respectively.
description: PDF zugänglich ab 10.11.19 (RSC-Embargofrist)