cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Counterterm resummation for 2PI-approximation in constant background
Creators: name: Patkos, A.
name: Szep, Zs.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Explicit counterterm construction is presented in a symmetry breaking background for the 2PI effective action of the self-interacting one-component scalar field including skeleton diagrams to O(λ^2). The applied strategy is an extension of our treatment of the 2PI-Hartree approximation [G. Fejos, A. Patkos and Zs. Szep, Nucl. Phys. A803 (2008) 135]. The procedure is also applied to the O(N) model.
description: 23 pages, 2 figures, typos corrected. Version published in Nucl. Phys. A
Learning Conditional Knowledge Distillation for Degraded-Reference Image Quality Assessment
Creators: name: Zheng, Heliang
name: Yang, Huan
name: Fu, Jianlong
name: Zha, Zheng-Jun
name: Luo, Jiebo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: An important scenario for image quality assessment (IQA) is to evaluate image restoration (IR) algorithms. The state-of-the-art approaches adopt a full-reference paradigm that compares restored images with their corresponding pristine-quality images. However, pristine-quality images are usually unavailable in blind image restoration tasks and real-world scenarios. In this paper, we propose a practical solution named degraded-reference IQA (DR-IQA), which exploits the inputs of IR models, degraded images, as references. Specifically, we extract reference information from degraded images by distilling knowledge from pristine-quality images. The distillation is achieved through learning a reference space, where various degraded images are encouraged to share the same feature statistics with pristine-quality images. And the reference space is optimized to capture deep image priors that are useful for quality assessment. Note that pristine-quality images are only used during training. Our work provides a powerful and differentiable metric for blind IRs, especially for GAN-based methods. Extensive experiments show that our results can even be close to the performance of full-reference settings.
Phase Retrieval and Design with Automatic Differentiation
Creators: name: Wong, Alison
name: Pope, Benjamin
name: Desdoigts, Louis
name: Tuthill, Peter
name: Norris, Barnaby
name: Betters, Chris
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The principal limitation in many areas of astronomy, especially for directly imaging exoplanets, arises from instability in the point spread function (PSF) delivered by the telescope and instrument. To understand the transfer function, it is often necessary to infer a set of optical aberrations given only the intensity distribution on the sensor - the problem of phase retrieval. This can be important for post-processing of existing data, or for the design of optical phase masks to engineer PSFs optimized to achieve high contrast, angular resolution, or astrometric stability. By exploiting newly efficient and flexible technology for automatic differentiation, which in recent years has undergone rapid development driven by machine learning, we can perform both phase retrieval and design in a way that is systematic, user-friendly, fast, and effective. By using modern gradient descent techniques, this converges efficiently and is easily extended to incorporate constraints and regularization. We illustrate the wide-ranging potential for this approach using our new package, Morphine. Challenging applications performed with this code include precise phase retrieval for both discrete and continuous phase distributions, even where information has been censored such as heavily-saturated sensor data. We also show that the same algorithms can optimize continuous or binary phase masks that are competitive with existing best solutions for two example problems: an Apodizing Phase Plate (APP) coronagraph for exoplanet direct imaging, and a diffractive pupil for narrow-angle astrometry. The Morphine source code and examples are available open-source, with a similar interface to the popular physical optics package Poppy.
Micro-rheology of a particle in a nonlinear bath: Stochastic Prandtl-Tomlinson model
Creators: name: Jain, Rohit
name: Ginot, Félix
name: Krüger, Matthias
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The motion of Brownian particles in nonlinear baths, such as, e.g., viscoelastic fluids, is of great interest. We theoretically study a simple model for such bath, where two particles are coupled via a sinusoidal potential. This model, which is an extension of the famous Prandtl Tomlinson model, has been found to reproduce some aspects of recent experiments, such as shear-thinning and position oscillations [J. Chem. Phys. {\bf 154}, 184904 (2021)]. Analyzing this model in detail, we show that the predicted behavior of position oscillations agrees qualitatively with experimentally observed trends; (i) oscillations appear only in a certain regime of velocity and trap stiffness of the confining potential, and (ii), the amplitude and frequency of oscillations increase with driving velocity, the latter in a linear fashion. Increasing the potential barrier height of the model yields a rupture transition as a function of driving velocity, where the system abruptly changes from a mildly driven state to a strongly driven state. The frequency of oscillations scales as $(v_0-v_0^*)^{1/2}$ near the rupture velocity $v_0^*$, found for infinite trap stiffness. Investigating the (micro-)viscosity for different parameter ranges, we note that position oscillations leave their signature by an additional (mild) plateau in the flow curves, suggesting that oscillations influence the micro-viscosity. For a time-modulated driving, the mean friction force of the driven particle shows a pronounced resonance behavior, i.e, it changes strongly as a function of driving frequency. The model has two known limits: For infinite trap stiffness, it can be mapped to diffusion in a tilted periodic potential. For infinite bath friction, the original Prandtl Tomlinson model is recovered. We find that the flow curve of the model (roughly) crosses over between these two limiting cases.
description: 15 pages, 12 figures
Refinement of Direction of Arrival Estimators by Majorization-Minimization Optimization on the Array Manifold
Creators: name: Scheibler, Robin
name: Togami, Masahito
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Sound (cs.SD)
subject: Audio and Speech Processing (eess.AS)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We propose a generalized formulation of direction of arrival estimation that includes many existing methods such as steered response power, subspace, coherent and incoherent, as well as speech sparsity-based methods. Unlike most conventional methods that rely exclusively on grid search, we introduce a continuous optimization algorithm to refine DOA estimates beyond the resolution of the initial grid. The algorithm is derived from the majorization-minimization (MM) technique. We derive two surrogate functions, one quadratic and one linear. Both lead to efficient iterative algorithms that do not require hyperparameters, such as step size, and ensure that the DOA estimates never leave the array manifold, without the need for a projection step. In numerical experiments, we show that the accuracy after a few iterations of the MM algorithm nearly removes dependency on the resolution of the initial grid used. We find that the quadratic surrogate function leads to very fast convergence, but the simplicity of the linear algorithm is very attractive, and the performance gap small.
description: 5 pages, 2 figures, 2 tables. Presented at IEEE ICASSP 2021
Creation and Analysis of the Yugoslav Rock Song Lyrics Corpus from 1945 to 2003
Creators: name: Ljudmila, Petkovic
Publisher: name: Zenodo
Year: 2019
Subjects: corpus linguistics, Yugoslav rock and roll, web scraping, natural language processing, text mining

description: The thesis analyzes, from the theoretical and practical perspective, the creation and processing of corpus of rock songs’ lyrics originating from the former Yugoslavia in the period 1945-2003. The lyrics are obtained from the LyricWiki website using the Python library lyricsmaster in the web scraping process. The collected texts are then merged into a single XML file and automatically annotated with the yattag Python tool. Afterwards, the data preprocessing was conducted at the formal and content level. Furthermore, the XML document is transformed into XHTML format applying XSLT processor, in order to generate basic corpus data. The diacritic restoration process with the “Slovo Majstor” application and morphological electronic dictionaries of Serbian language in the LeXimir software package, is also automated. The text mining process encompassed retrieving socio-political and patriotic topics using NLTK library in Python, while romantic and other topics were visualized using the TreeCloud and WordItOut software. The similarity between authors represented in the corpus was measured using stylo package in the programming language R. Finally, an overview of the today’s most relevant programming libraries in the field of natural language processing is provided, which, at the same time, serves as a guideline for the future work.
The effect of biofluorescence on predation upon Cope's gray treefrog: A clay model experiment
Creators: name: Whitcher, Courtney
Publisher: name: Zenodo
Year: 2024
Subjects: Predation
biofluorescence
clay model

description: Biofluorescence, the ability to absorb light and reemit it at a longer wavelength, is present in many taxa but has been examined only recently in amphibians. Over half of the studies examining biofluorescence in the last century suggest this fluorescent signal may affect predation; however, to date, only one experimental study has tested this hypothesis. To address this question, we experimentally tested the effect of biofluorescence on predation through the study of the Cope's Gray Treefrog, Hyla chrysoscelis. First, we quantified the spectral characteristics of a novel biofluorescence pattern in H. chrysoscelis. In this species, the fluorescent signal is concentrated in an area for both sexes that contains a flash pattern proposed to warn predators of the frog's toxic secretions. We hypothesized that the biofluorescent trait may increase the conspicuousness of this flash pattern and enable the frogs to deter predators more effectively. Second, we tested this prediction by conducting a clay model field experiment to assess differences in predation attempts on fluorescent versus non-fluorescent H. chrysoscelis models by various predator types. We found no effect of biofluorescence on the overall presence and type of predation, suggesting that biofluorescence does not contribute strongly to the deterring effect of the antipredator flash signal of H. chrysoscelis. This study represents one of the first attempts to experimentally test the effect of biofluorescence on predation in any organism and the first to do so in amphibians. Further work is needed to explore the role of this trait in predation in other systems and to investigate alternative functions for the biofluorescent signal in H. chrysoscelis.
description: Funding provided by: North Carolina Herpetological Society*Crossref Funder Registry ID: Award Number:
Stochastic dynamics of magnetization in a ferromagnetic nanoparticle out of equilibrium
Creators: name: Basko, D. M.
name: Vavilov, M. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider a small metallic particle (quantum dot) where ferromagnetism arises as a consequence of Stoner instability. When the particle is connected to electrodes, exchange of electrons between the particle and the electrodes leads to a temperature- and bias-driven Brownian motion of the direction of the particle magnetization. Under certain conditions this Brownian motion is described by the stochastic Landau-Lifshitz-Gilbert equation. As an example of its application, we calculate the frequency-dependent magnetic susceptibility of the particle in a constant external magnetic field, which is relevant for ferromagnetic resonance measurements.
description: 15 pages, 6 figures
Concept Identification of Directly and Indirectly Related Mentions Referring to Groups of Persons
Creators: name: Zhukova, Anastasia
name: Hamborg, Felix
name: Donnay, Karsten
name: Gipp, Bela
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Unsupervised concept identification through clustering, i.e., identification of semantically related words and phrases, is a common approach to identify contextual primitives employed in various use cases, e.g., text dimension reduction, i.e., replace words with the concepts to reduce the vocabulary size, summarization, and named entity resolution. We demonstrate the first results of an unsupervised approach for the identification of groups of persons as actors extracted from a set of related articles. Specifically, the approach clusters mentions of groups of persons that act as non-named entity actors in the texts, e.g., "migrant families" = "asylum-seekers." Compared to our baseline, the approach keeps the mentions of the geopolitical entities separated, e.g., "Iran leaders" != "European leaders," and clusters (in)directly related mentions with diverse wording, e.g., "American officials" = "Trump Administration."
Trionic and quartetting phases in one-dimensional multicomponent ultracold fermions
Creators: name: Lecheminant, P.
name: Azaria, P.
name: Boulat, E.
name: Capponi, S.
name: Roux, G.
name: White, S. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the possible formation of a molecular condensate, which might be, for instance, the analogue of the alpha condensate of nuclear physics, in the context of multicomponent cold atoms fermionic systems. A simple paradigmatic model of N-component fermions with contact interactions loaded into a one-dimensional optical lattice is studied by means of low-energy and numerical approaches. For attractive interaction, a quasi-long-range molecular superfluid phase, formed from bound-states made of N fermions, emerges at low density. We show that trionic and quartetting phases, respectively for N=3,4, extend in a large domain of the phase diagram and are robust against small symmetry-breaking perturbations.
description: Contribution to the SOTANCP 2008 workshop
Chemical enrichment in the cluster of galaxies Hydra A
Creators: name: Simionescu, A.
name: Werner, N.
name: Böhringer, H.
name: Kaastra, J. S.
name: Finoguenov, A.
name: Brüggen, M.
name: Nulsen, P. E. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyzed global properties, radial profiles and 2D maps of the metal abundances and temperature in the cool core cluster of galaxies Hydra A using a deep XMM-Newton exposure. The best fit among the available spectral models is provided by a Gaussian distribution of the emission measure (gdem). We can accurately determine abundances for 7 elements in the cluster core with EPIC and 3 elements with RGS. The gdem model gives lower Fe abundances than a single temperature model. The abundance profiles for Fe, Si, S, but also O are centrally peaked. Combining the Hydra A results with 5 other clusters for which detailed chemical abundance studies are available, we find a significant decrease of O with radius, while the increase in the O/Fe ratio with radius is small within 0.1 r_200. We compare the observed abundance ratios with the mixing of various supernova type Ia and core-collapse yield models in different relative amounts. Producing the estimated O, Si and S peaks in Hydra A requires either an amount of metals ejected by stellar winds 3-8 times higher than predicted by available models or a remaining peak in the enrichment by core-collapse supernovae from the protocluster phase. The temperature map shows cooler gas extending in arm-like structures towards the north and south. These structures appear to be richer in metals than the ambient medium and spatially correlated with the large-scale radio lobes. We estimate the mass of cool gas, which was probably uplifted by buoyant bubbles of relativistic plasma produced by the AGN, to 1.6-6.1x10^9 M_sun, and the energy associated with this uplift to 3.3-12.5x10^58 ergs. The best estimate of the mass of Fe uplifted together with the cool gas is 1.7x10^7 M_sun, 15% of the total mass of Fe in the central 0.5arcmin region.
description: A&A, in press. Corrected right panel of Fig. 11, no other changes compared to previous version
Aspects of the electroslag welding process
Creators: name: Bacon, W. G.
Publisher: name: University of British Columbia
Year: 2010

description: The electroslag welding (ESW) process has been investigated utilizing consumable guide welding procedures. Electroslag welding employing large square cross-section electrodes was also studied. The study of the process parameters is of importance in understanding the role which they play in determining the grain size attained in the heat affected zone of the resultant weld. The large grain size adversely effects the impact strength: the grain size is a direct consequence of the thermal history. The thermal history of the base metal was determined during welding for various physical configurations and welding schedules. The welding parameters having the major effect on the thermal history are: mode of welding, electrode immersion depth, slag depth, welding velocity and specific power input. The penetration of the parent metal and size of the heat-affected zone as well as the grain size have been shown to be a consequence of the thermal history. The quazi-steady state electrical and temperature distributions in the slag are seen to determine the temperature distribution in the metal. The preferred modes of welding are alternating current (AC) and direct current reverse polarity (DCRP) with direct current straight polarity (DCSP) being unacceptable due to the high inclusion content of the weld when DCSP is employed. The electrode immersion depth, or interelectrode gap, has been found to determine the volume of the effective heat source and thus the temperature and electrical distributions. The slag depth and electrode velocity are the principal factors which determine the interelectrode gap when the slag chemistry and physical configuration are constant. There exist ranges of slag depth and electrode velocity values outside of which welding is not achieved. An analytical model has been employed which adequately describes thick plate welding practice, but which only applies to thin plate welds in a qualitative manner. In this model, an empirical equation has been used to calculate electrode immersion values which compare favourably with the measured values. In addition,the Bastein method of grain size calculation has been applied to the thermal histories obtained experimentally and has been found to be applicable. In welds where impact strength is an important design criteria the weld/HAZ grain size is an important variable. We conclude that no combination of ESW process parameters will lead to an acceptable HAZ grain size giving HAZ impact values comparable with the parent plate. In such cases full heat treatment of the HAZ would be mandatory.
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Demaine, Erik D.
name: Grandoni, Fabrizio
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2016
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 49, 8th International Conference on Fun with Algorithms (FUN 2016), pages 0:i-0:xvi
title: Design, Synthese und Evaluation von reversibel- und kovalent-bindenden, Serin-gerichteten LRRK2-Inhibitoren
Creators: name: Stuckert, Johanna
Publisher: name: UNSPECIFIED
Year: 2021

description: Parkinson ist die zweithäufigste, neurodegenerative Erkrankung in Deutschland und steht im engen Kontext mit einer Überaktivität der Kinase LRRK2, sowie der aktivierenden G2019S-Mutation dieser. Die Parkinson-Erkrankung wird aktuell rein symptomatisch behandelt, indem der durch das Absterben der dopaminergen Neuronen entstandene Dopamin-Mangel durch die Gabe von Levodopa kompensiert wird. Um das Fortschreiten der Erkrankung zu verlangsamen, erscheinen LRRK2-Inhibitoren als geeignet. Die Entwicklung solcher Inhibitoren, welche möglichst kovalent an Ser1954 der Kinase-Domäne binden sollen, steht im Fokus dieser Arbeit und gliedert sich in drei Schritte: dem Computer-gestützten Design von Inhibitoren in geeigneten Modellen der Kinasedomäne von LRRK2, der Synthese der Verbindungen sowie der in vitro und in vivo Evaluation dieser. Dazu wurden zuerst Chinolin-Verbindungen auf Basis eines zuvor entwickelten Homologiemodells identifiziert und untersucht. Im Anschluss wurden in einer zwischenzeitlich veröffentlichten Surrogat-Kristallstruktur der Kinasedomäne von LRRK2 7-Azaindol-Verbindungen entwickelt. Diese zeigten eine gute Inhibition der Kinase LRRK2 sowie eine mäßige Toxizität und gute Permeabilität im Zebrafisch-Embryonen-Toxizitätsassay. In einem dritten Projekt wurden 7-Azaindol-Verbindungen entwickelt, welche als Ausgangspunkt für die kovalente Inhibition von Ser1951 dienen sollen.
Factors influencing the recovery of molybdenum during the hypochlorite leaching of low grade molybdenite-copper concentrates
Creators: name: Mounsey, Diana Mary
Publisher: name: University of British Columbia
Year: 2010

description: An investigation into the factors influencing the extraction of molybdenum from copper sulphide molybdenite concentrates in alkaline hypochlorite solutions has been carried out. Sodium carbonate buffer components were found to act as complexing agents for the copper, enabling it to exist in solution as a cupri-carbonate species several orders of magnitude more soluble than the thermodynamically stable copper phase at pH 9.0. Completely selective molybdenum extraction is therefore only possible from solutions containing no carbonate. The removal of the carbonate produced adverse side effects for the sodium hypochlorite lixiviant as a result of copper hydroxide formation on the mineral surface which led to rapid decomposition of the hypochlorite by heterogeneous catalysis. This hydroxide salt was found to consist at least partially of tri-valent copper and it was confirmed that sodium hypochlorite has a sufficiently high redox potential at pH 9.0 to enable the oxidation of copper[sup II] → copper[sup III] to take place. Experiment also showed that a tri-valent copper carbonate compound precipitated from leaching solutions containing copper after a suitable nucleation period. It was thus established that the copper present in carbonate containing hypochlorite solutions exists as the tri-valent complex Cu(CO₃)₃³⁻; that the induction time to precipitation is a function of the total carbonate content of the system, and that the solid precipitate is also an active catalyst for hypochlorite decomposition. The leaching of molybdenite - copper concentrates in acid solutions was studied, and results showed that such a process would not be feasible due to the formation and precipitation of copper molybdate, CuMoO₄. This compound is very insoluble, but its formation was found to be suppressed by the presence of sodium bicarbonate at pH values greater than 6.0. Several other insoluble molybdate compounds were found to be capable of forming in both acid and alkaline solutions as a result of hypochlorite dissolution of impurity elements contained in the copper sulphide ores. Potential-pH diagrams constructed to show the thermodynamic stability of the molybdate salts of copper, iron, calcium, zinc, lead and cadmium are included. Calcium was isolated as being the most detrimental impurity element in this respect, due to its common occurrence in copper porphyry ores as well as its solubility in chloride containing solutions. A limited study was carried out to show that this solubility increased in proportion to the chloride content and hence the hypochlorite concentration of leaching solutions. Calcium carbonate was found to precipitate in preference to calcium molybdate, but the use of silicates and phosphates as calcium suppressants was also considered as a means of avoiding copper - carbonate complexing while maintaining good molybdenum extraction.
The influence of memory in deterministic walks in random media: analytical calculation within a mean field approximation
Creators: name: Tercariol, Cesar Augusto Sangaletti
name: Martinez, Alexandre Souto
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Consider a random medium consisting of points randomly distributed so that there is no correlation among the distances. This is the random link model, which is the high dimensionality limit (mean field approximation) for the euclidean random point structure. In the random link model, at discrete time steps, the walker moves to the nearest site, which has not been visited in the last $μ$ steps (memory), producing a deterministic partially self avoiding walk (the tourist walk). We have obtained analitically the distribution of the number $n$ of points explored by a walker with memory $μ= 2$, as well as the transient and period joint distribution. This result enables to explain the abrupt change in the exploratory behavior between the cases $μ= 1$ (memoryless, driven by extremal statistics) and $μ= 2$ (with memory, driven by combinatorial statistics). In the $μ= 1$ case, the mean newly visited points in the thermodynamic limit $(N \gg 1)$ is just $ = e = 2.72 ...$ while in the $μ= 2$ case, the mean number $$ of visited points is proportional to $N^{1/2}$. Also, this result allows us to stabilish an equivalence between the random link model with $μ=2$ and random map (uncorrelated back and forth distances) with $μ=0$ and the drastic change between the cases where the transient time is null compared to non-null transient times.
description: 9 pages and 3 figures
Debate on Online Social Networks at the Time of COVID-19: An Italian Case Study
Creators: name: Trevisan, Martino
name: Vassio, Luca
name: Giordano, Danilo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: The COVID-19 pandemic is not only having a heavy impact on healthcare but also changing people's habits and the society we live in. Countries such as Italy have enforced a total lockdown lasting several months, with most of the population forced to remain at home. During this time, online social networks, more than ever, have represented an alternative solution for social life, allowing users to interact and debate with each other. Hence, it is of paramount importance to understand the changing use of social networks brought about by the pandemic. In this paper, we analyze how the interaction patterns around popular influencers in Italy changed during the first six months of 2020, within Instagram and Facebook social networks. We collected a large dataset for this group of public figures, including more than 54 million comments on over 140 thousand posts for these months. We analyze and compare engagement on the posts of these influencers and provide quantitative figures for aggregated user activity. We further show the changes in the patterns of usage before and during the lockdown, which demonstrated a growth of activity and sizable daily and weekly variations. We also analyze the user sentiment through the psycholinguistic properties of comments, and the results testified the rapid boom and disappearance of topics related to the pandemic. To support further analyses, we release the anonymized dataset.
B_s mixing phase and lepton flavor violation in supersymmetric SU(5)
Creators: name: Park, Jae-hyeon
name: Yamaguchi, Masahiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We inspect consequences of the latest B_s mixing phase measurements on lepton flavor violation in a supersymmetric SU(5) theory. The O(1) phase, preferring a non-vanishing squark mixing, generically implies tau -> (e + mu) gamma and mu -> e gamma. Depending on the gaugino and the scalar mass parameters as well as tan beta, the rates turn out to be detectable or even already excessive, if the RR mass insertion of down-type squarks is nonzero. We find that it becomes easy to reconcile B_s mixing phase with lepton flavor violation given: gaugino to scalar squared mass ratio around 1/12, both LL and RR insertions with decent sizes, and low tan beta.
description: 11 pages, updated using phi_s from HFAG, conclusion unchanged
The contribution of fermionic seesaws to the anomalous magnetic moment of leptons
Creators: name: Biggio, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate the contribution to the anomalous magnetic moment of leptons in the type-I and type-III seesaw models. We show that, even if the scale of the new physics is pushed down to the electroweak scale, this contribution is not large enough to explain the measured discrepancy of the muon anomalous magnetic moment.
description: 13 pages, uses axodraw.sty. References added, formulas corrected, comments added, results and conclusions unchanged. Version to appear on Phys. Lett. B
On the Small Deviation Problem for Some Iterated Processes
Creators: name: Aurzada, Frank
name: Lifshits, Mikhail
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We derive general results on the small deviation behavior for some classes of iterated processes. This allows us, in particular, to calculate the rate of the small deviations for $n$-iterated Brownian motions and, more generally, for the iteration of $n$ fractional Brownian motions. We also give a new and correct proof of some results in E. Nane, Laws of the iterated logarithm for $α$-time Brownian motion, Electron. J. Probab. 11 (2006), no. 18, 434--459.
description: Preprint, 21p
Steady state of Stochastic Sandpile Models
Creators: name: Sadhu, Tridib
name: Dhar, Deepak
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the steady state of the abelian sandpile models with stochastic toppling rules. The particle addition operators commute with each other, but in general these operators need not be diagonalizable. We use their abelian algebra to determine their eigenvalues, and the Jordan block structure. These are then used to determine the probability of different configurations in the steady state. We illustrate this procedure by explicitly determining the numerically exact steady state for a one dimensional example, for systems of size $\le12$, and also study the density profile in the steady state.
description: 16 pages, 4 figures
Gravitational clustering: an overview
Creators: name: Labini, Francesco Sylos
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss the differences and analogies of gravitational clustering in finite and infinite systems. The process of collective, or violent, relaxation leading to the formation of quasi-stationary states is one of the distinguished features in the dynamics of self-gravitating systems. This occurs, in different conditions, both in a finite than in an infinite system, the latter embedded in a static or in an expanding background. We then discuss, by considering some simple and paradigmatic examples, the problems related to the definition of a mean-field approach to gravitational clustering, focusing on role of discrete fluctuations. The effect of these fluctuations is a basic issue to be clarified to establish the range of scales and times in which a collision-less approximation may describe the evolution of a self-gravitating system and for the theoretical modeling of the non-linear phase.
description: 17 pages, 6 figures. Chapter of the volume ``Dynamics and Thermodynamics of systems with long range interactions: theory and experiments'', A. Campa, A. Giansanti, G. Morigi, F. Sylos Labini Eds., American Institute of Physics Conference proceedings, 970 (2008). See http://scitation.aip.org/dbt/dbt.jsp?KEY=APCPCS&Volume=970&Issue=1
How to measure a spinon Fermi surface
Creators: name: Norman, M. R.
name: Micklitz, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose an experiment to identify the potential existence of a spinon Fermi surface by looking for oscillatory coupling between two ferromagnets via a spin liquid spacer. Three candidate spin liquids are investigated, and it is found that in all cases, long period oscillations should be present, the period of which would identify the Fermi wavevector of the spinon surface.
description: more details on the calculations; to be published, Phys. Rev. Lett
On a class of optimal stopping problems for diffusions with discontinuous coefficients
Creators: name: Rüschendorf, Ludger
name: Urusov, Mikhail A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G40 (Primary) 60H10 (Secondary)

description: In this paper, we introduce a modification of the free boundary problem related to optimal stopping problems for diffusion processes. This modification allows the application of this PDE method in cases where the usual regularity assumptions on the coefficients and on the gain function are not satisfied. We apply this method to the optimal stopping of integral functionals with exponential discount of the form $E_x\int_0^τe^{-λs}f(X_s) ds$, $λ\ge0$ for one-dimensional diffusions $X$. We prove a general verification theorem which justifies the modified version of the free boundary problem. In the case of no drift and discount, the free boundary problem allows to give a complete and explicit discussion of the stopping problem.
description: Published in at http://dx.doi.org/10.1214/07-AAP474 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
20 Years of Piano Research at the University of Oslo
Creators: name: Jensenius, Alexander Refsum
Publisher: name: Zenodo
Year: 2024

description: In this lecture-recital, I will present piano-related research from the Department of Musicology over the last twenty years. I will also reflect on my role in this history, both as an artist and scientist. Finally, I will scrutinize the department's new Disklavier while performing various exploratory etudes.
Material characteristics affecting formcoke
Creators: name: Gill, Wayne William
Publisher: name: University of British Columbia
Year: 2010

description: The influence of aggregate and binder phase characteristics on formcoke products has been studied. This involved investigating the compaction kinetics of the system and determining the mechanical strength of the briquettes produced. The char phase was characterized in terms of density, hardness, porosity and residual volatile matter content and the rheological properties of the binder phases used were established elsewhere. The strength and wetting behaviour of the aggregate-binder interface were studied using model materials (an SRC pitch binder and a graphite rod aggregate) as well as those produced in this work. Analysis of compaction curves was carried out using the CCWL Hot Compaction Model for Char-Binder Coal systems which was found to adequately describe the observed compaction behaviour. Briquette strength was characterized by ultimate compressive strength and comparisons were made for a constant briquette bulk porosity of 35% (by volume). Results indicate that binder phase fluidity affects compaction viscosity during the particle flow stage of compaction and that char porosity influences final briquette bulk density by affecting the amount of total compaction required to obtain a given bulk density. In general, increased total compaction was shown to result in higher product bulk density and high bulk density was found to yield higher gross composite strength. The latter relationship was seen to be approximately linear over the range of bulk porosity encountered in this study. A higher briquette strength was found for systems with aggregates carbonized at lower temperatures. This was attributed to a combination of higher porosity and stronger char-binder interfacial strength, although the former effect was considered to predominate in the systems considered here. Binder phase fluidity was also seen to affect briquette strength, higher fluidity resulting in higher strength. It was concluded that this was due to increased binder penetration of the aggregate phase. With no significant pore structure in the aggregate, as found with high temperature char, briquette strength was seen to become approximately constant for the three binder coals used. It was concluded that a good formcoke product was aided by a highly fluid binder and a char pore structure accessible to the binder phase.
A OFERTA DA LIBRAS NOS CURSOS DE FORMAÇÃO CONTINUADA DE PROFESSORES PELA SEMED DE ARAGUATINS
Creators: name: Wescley Melo de SOUZA
name: Francisca da Silva FEITOSA
name: Maria José de PINHO
Publisher: name: Zenodo
Year: 2024
Subjects: Araguatins
Formação continuada
LIBRAS
Professores

description: RESUMO

 

A Língua Brasileira de Sinais é uma língua formada por gestos, expressões faciais e corporais, utilizada pelos deficientes auditivos para a comunicação, seja com a comunidade surda ou com os ouvintes. O estudo justifica-se por perceber que durante o meu processo formativo foi notável a ausência de profissionais com domínio da LIBRAS para atender a comunidade surda, dificultando assim a comunicação e consequentemente o processo de ensino aprendizagem. O problema concentra-se no seguinte questionamento: O município de Araguatins tem preparado seus professores para lidar com alunos surdos na escola? O objetivo da pesquisa é apresentar a oferta da Libras nos cursos de formação continuada dos professores da rede municipal de ensino de Araguatins nos últimos dez anos. Os objetivos específicos são: Relatar o histórico da 

LIBRAS e sua obrigatoriedade nos cursos de licenciatura. Identificar se houve a oferta da Libras na formação continuada de professores nos últimos dez anos. Apresentar a importância da oferta da Língua Brasileira de Sinais na formação continuada de professores. Caracterizada como uma pesquisa de natureza qualitativa, bibliográfica e documental, realizada a partir de consultas em artigos, revistas, livros e capítulos, biblioteca virtual da Unitins, entre outros. O referencial teórico está ancorado em trabalhos de Appolinário (2011), Freire (2003), Rodrigues (2006), documentos legais, como o Brasil (2002), acervo da Secretaria Municipal de Educação-SEMED e da Escola de Tempo Integral Professora Nair Duarte, setor Atendimento Educacional Especializado – AEE, a fim de obter resultados da oferta da Libras nos cursos de formação continuada em Araguatins.
Multi-Instantons and Multi-Cuts
Creators: name: Marino, Marcos
name: Schiappa, Ricardo
name: Weiss, Marlene
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We discuss various aspects of multi-instanton configurations in generic multi-cut matrix models. Explicit formulae are presented in the two-cut case and, in particular, we obtain general formulae for multi-instanton amplitudes in the one-cut matrix model case as a degeneration of the two-cut case. These formulae show that the instanton gas is ultra-dilute, due to the repulsion among the matrix model eigenvalues. We exemplify and test our general results in the cubic matrix model, where multi-instanton amplitudes can be also computed with orthogonal polynomials. As an application, we derive general expressions for multi-instanton contributions in two-dimensional quantum gravity, verifying them by computing the instanton corrections to the string equation. The resulting amplitudes can be interpreted as regularized partition functions for multiple ZZ-branes, which take into full account their back-reaction on the target geometry. Finally, we also derive structural properties of the trans-series solution to the Painleve I equation.
description: 34 pages, 3 figures, JHEP3.cls; v2: added references, minor changes; v3: added 1 reference, more minor changes, final version for JMP; v4: more typos corrected
Multiple quantum NMR in solids as a method of determination of Wigner-Yanase skew information
Creators: name: Doronin, S. I.
name: Fel'dman, E. B.
name: Lazarev, I. D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A connection of the Wigner-Yanase skew information and multiple quantum (MQ) NMR coherences is considered at different temperatures and evolution times of nuclear spins with dipole-dipole interactions in MQ NMR experiments in solids. It is shown that the Wigner-Yanase skew information at temperature $T$ is equal to the double second moment of the MQ NMR spectrum at the double temperature for any evolution times. A comparison of the many-spin entanglement obtained with the Wigner-Yanase information and the Fisher information is conducted.
DMRG studies of critical SU(N) spin chains
Creators: name: Fuehringer, M.
name: Rachel, S.
name: Thomale, R.
name: Greiter, M.
name: Schmitteckert, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The DMRG method is applied to integrable models of antiferromagnetic spin chains for fundamental and higher representations of SU(2), SU(3), and SU(4). From the low energy spectrum and the entanglement entropy, we compute the central charge and the primary field scaling dimensions. These parameters allow us to identify uniquely the Wess-Zumino-Witten models capturing the low energy sectors of the models we consider.
description: 14 pages, 8 figures; final version, to appear in Ann. Phys
ADVANCE CARE PLANNING IN A SKILLED NURSING FACILITY: A QUALITY IMPROVEMENT PROJECT
Creators: name: Shoemaker, Dane
Publisher: name: Zenodo
Year: 2018

description: An increasing number of deaths in the United States are taking place in post-acute and skilled nursing facilities (SNF) and the trend is expected to continue. Demand for higher quality care at the end-of-life (EoL) calls for improvements in bedside nursing related to palliative care (PC) including advance care planning (ACP). In the state of California, a centerpiece of ACP is the completion of the Physician’s Orders for LifeSustaining Treatment (POLST) form. The purpose of the project was to improve ACP activities in a large post-acute care facility located in Southern California. The aims were (1) to describe the current state of ACP practices, (2) to develop and implement a PC-centered training program for licensed and non-licensed nurses, and (3) to evaluate the effectiveness of the intervention on ACP. The project employed an observational pre-posttest design. Nurses (licensed and non-licensed) were provided a class on PC concepts including EoL care and documentation. A tool modified from the literature measured PC and ACP knowledge, skills and attitudes (KSA) of nurses (28 items, Likert scale, range 1-5). Pre-postintervention chart audits evaluated POLST completeness. POLST forms from patient’s charts (n = 60), licensed registered nurses (n = 10), licensed vocational nurses (n = 26), and non-licensed clinical nursing assistants (n = 50) comprised the sample for this project. Post-intervention chart audits for POLST completeness increased from 52% to 62% (a 10-percentage point increase). Licensed nurses and unlicensed CNA’s post-test mean scores on PC knowledge, skills and attitudes improved (mean 3.71 [SD .43] to mean 4.17 [SD .49], mean 3.76 [SD .65] to mean 3.90 iv [SD .70], respectively). In addition, aggregated post-test scores for both groups improved (3.74 [1-5, SD .57] to 4.02 [1-5, SD .63], t- = 5.63, p = < .001). Twenty-two percent (n = 19) of the participants showed marginal KSA decrements (range differences -1.11 to - 0.04). Implementation of PC-based trainings improves nursing KSA related to palliative and EoL care across nursing levels. PC trainings may improve completeness of POLST documentation. The decrements in KSA scores suggest that trainings may sensitize nurses to challenges in providing palliative and EoL care. This project demonstrates the feasibility of implementing a facility wide PC educational program to a population who frequently lack access to evidence-based PC and EoL information.
Emission from Large-scale Jets in Quasars
Creators: name: Uchiyama, Yasunobu
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the emission processes in the large-scale jets of powerful quasars based on the results obtained with the VLA, Spitzer, Hubble, and Chandra. We show that two well-known jets, 3C 273 and PKS 1136-135, have two distinct spectral components on large-scales: (1) the low-energy (LE) synchrotron spectrum extending from radio to infrared, and (2) the high-energy (HE) component arising from optical and extending to X-rays. The X-ray emission in quasar jets is often attributed to inverse-Compton scattering of cosmic microwave background (CMB) photons by radio-emitting electrons in a highly relativistic jet. However, recent data prefer synchrotron radiation by a second distinct population as the origin of the HE component. We anticipate that optical polarimetry with Hubble will establish the synchrotron nature of the HE component. Gamma-ray observations with GLAST (renamed as the Fermi Gamma-ray Space Telescope), as well as future TeV observations, are expected to place important constraints on the jet models.
description: 4 pages, 4 figures, to appear in a special issue of the International Journal of Modern Physics D, proceedings of "High Energy Phenomena in Relativistic Outflows", held in Dublin Sept 2007