cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Chern-Simons One-form and Gravity on a Fuzzy Space
Creators: name: Nair, V. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The one-dimensional ${\cal N}\times {\cal N}$-matrix Chern-Simons action is given, for large ${\cal N}$ and for slowly varying fields, by the $(2k+1)$-dimensional Chern-Simons action $S_{CS}$, where the gauge fields in $S_{CS}$ parametrize the different ways in which the large ${\cal N}$ limit can be taken. Since some of these gauge fields correspond to the isometries of the space, we argue that gravity on fuzzy spaces can be described by the one-dimensional matrix Chern-Simons action at finite ${\cal N}$ and by the higher dimensional Chern-Simons action when the fuzzy space is approximated by a continuous manifold.
description: 16 pages, references added
Homogenization of a porous intercalation electrode with phase separation
Creators: name: Heida, Martin
name: Landstorfer, Manuel
name: Liero, Matthias
Publisher: name: Weierstrass Institute
Year: 2021
Subjects: subject: Battery
subject: homogenization
subject: two-scale convergence
subject: porous electrode
subject: non-equilibrium thermodynamics
subject: phase separation
subject: 78A57
subject: 35Q92
subject: 35B27
subject: 78M40
subject: 80A22

description: In this work, we derive a new model framework for a porous intercalation electrode with a phase separating active material upon lithium intercalation. We start from a microscopic model consisting of transport equations for lithium ions in an electrolyte phase and intercalated lithium in a solid active phase. Both are coupled through a Neumann--boundary condition modeling the lithium intercalation reaction. The active material phase is considered to be phase separating upon lithium intercalation. We assume that the porous material is a given periodic microstructure and perform analytical homogenization. Effectively, the microscopic model consists of a diffusion and a Cahn--Hilliard equation, whereas the limit model consists of a diffusion and an Allen--Cahn equation. Thus we observe a Cahn--Hilliard to Allen--Cahn transition during the upscaling process. In the sense of gradient flows, the transition goes in hand with a change in the underlying metric structure of the PDE system.
title: Неизвестный С. П. Розанов. Предисловие
Creators: name: Груздева, Е. Н.
Publisher: name: Реноме
Year: 2021

description: Имя Сергея Павловича Розанова, историка литературы и археографа, активно работавшего в Петербурге — Ленинграде в первой трети ХХ в., сегодня известно лишь узкому кругу специалистов по истории летописания и древнерусской письменности. Как историк древнерусской литературы С. П. Розанов преимущественно известен подготовкой к изданию двух русских хронографов и несколькими статьями. Между тем его вклад в науку, на первый взгляд скромный и незаметный, не следует недооценивать. Настоящая серия очерков предполагает привлечь внимание к фигуре почти забытого русского ученого. Освещая пока лишь отдельные эпизоды его биографии, надеемся, что со временем будут заполнены все оставшиеся в ней лакуны.
A Max-AR(1) Model with Max-Semistable Marginals
Creators: name: Satheesh, S
name: Sandhya, E
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 60G18, 60G52, 60G70, 62M10

description: The structure of stationary first order max-autoregressive schemes with max-semi-stable marginals is studied. A connection between semi-selfsimilar extremal processes and this max-autoregressive scheme is discussed resulting in their characterizations. Corresponding cases of max-stable and selfsimilar extremal processes are also discussed.
description: In journal format, 5 Pages, contents changed
Effective-interaction approach to the many-boson problem
Creators: name: Christensson, J.
name: Forssén, C.
name: Åberg, S.
name: Reimann, S. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Nuclear Theory (nucl-th)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We show that the convergence behavior of the many-body numerical diagonalization scheme for strongly interacting bosons in a trap can be significantly improved by the Lee-Suzuki method adapted from nuclear physics: One can construct an effective interaction that acts in a space much smaller than the original Hilbert space. In particular for short-ranged forces and strong correlations, the method offers a good estimate of the energy and the excitation spectrum, at a computational cost several orders of magnitude smaller than that required by the standard method.
description: 5 pages, 4 figures
INTEGRATION OF THE ENGLISH LANGUAGE INTO ACADEMIC DISCIPLINES
Creators: name: Mirzayeva, Hilola
Publisher: name: Zenodo
Year: 2024

description: As English continues to dominate as the global lingua franca, its integration into various academic disciplines has become increasingly vital. This article explores the significance of embedding English language instruction within academic curricula, emphasizing the benefits and challenges associated with this integration. By examining effective strategies, we can better prepare students for a globalized academic and professional landscape.
The Magnetic Field in the Milky Way Filamentary Bone G47
Creators: name: Stephens, Ian W.
name: Myers, Philip C.
name: Zucker, Catherine
name: Jackson, James M.
name: Andersson, B-G
name: Smith, Rowan
name: Soam, Archana
name: Battersby, Cara
name: Sanhueza, Patricio
name: Hogge, Taylor
name: Smith, Howard A.
name: Novak, Giles
name: Sadavoy, Sarah
name: Pillai, Thushara
name: Li, Zhi-Yun
name: Looney, Leslie W.
name: Sugitani, Koji
name: Coude, Simon
name: Guzman, Andres
name: Goodman, Alyssa
name: Kusune, Takayoshi
name: Santos, Fabio P.
name: Zuckerman, Leah
name: Encalada, Frankie
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Star formation primarily occurs in filaments where magnetic fields are expected to be dynamically important. The largest and densest filaments trace spiral structure within galaxies. Over a dozen of these dense ($\sim$10$^4$\,cm$^{-3}$) and long ($>$10\,pc) filaments have been found within the Milky Way, and they are often referred to as "bones." Until now, none of these bones have had their magnetic field resolved and mapped in their entirety. We introduce the SOFIA legacy project FIELDMAPS which has begun mapping $\sim$10 of these Milky Way bones using the HAWC+ instrument at 214\,$μ$m and 18$\farcs$2 resolution. Here we present a first result from this survey on the $\sim$60\,pc long bone G47. Contrary to some studies of dense filaments in the Galactic plane, we find that the magnetic field is often not perpendicular to the spine (i.e., the center-line of the bone). Fields tend to be perpendicular in the densest areas of active star formation and more parallel or random in other areas. The average field is neither parallel or perpendicular to the Galactic plane nor the bone. The magnetic field strengths along the spine typically vary from $\sim$20 to $\sim$100\,$μ$G. Magnetic fields tend to be strong enough to suppress collapse along much of the bone, but for areas that are most active in star formation, the fields are notably less able to resist gravitational collapse.
description: Accepted to ApJL; typo in author list metadata corrected
Evidence for the formation of a Mott state in potassium-intercalated pentacene
Creators: name: Craciun, M. F.
name: Giovannetti, G.
name: Rogge, S.
name: Brocks, G.
name: Morpurgo, A. F.
name: Brink, J. van den
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We investigate electronic transport through pentacene thin-films intercalated with potassium. From temperature-dependent conductivity measurements we find that potassium-intercalated pentacene shows metallic behavior in a broad range of potassium concentrations. Surprisingly, the conductivity exhibits a re-entrance into an insulating state when the potassium concentration is increased past one atom per molecule. We analyze our observations theoretically by means of electronic structure calculations, and we conclude that the phenomenon originates from a Mott metal-insulator transition, driven by electron-electron interactions.
description: 8 pages, 6 figures
CAA-Net: Conditional Atrous CNNs with Attention for Explainable Device-robust Acoustic Scene Classification
Creators: name: Ren, Zhao
name: Kong, Qiuqiang
name: Han, Jing
name: Plumbley, Mark D.
name: Schuller, Björn W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Sound (cs.SD)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Acoustic Scene Classification (ASC) aims to classify the environment in which the audio signals are recorded. Recently, Convolutional Neural Networks (CNNs) have been successfully applied to ASC. However, the data distributions of the audio signals recorded with multiple devices are different. There has been little research on the training of robust neural networks on acoustic scene datasets recorded with multiple devices, and on explaining the operation of the internal layers of the neural networks. In this article, we focus on training and explaining device-robust CNNs on multi-device acoustic scene data. We propose conditional atrous CNNs with attention for multi-device ASC. Our proposed system contains an ASC branch and a device classification branch, both modelled by CNNs. We visualise and analyse the intermediate layers of the atrous CNNs. A time-frequency attention mechanism is employed to analyse the contribution of each time-frequency bin of the feature maps in the CNNs. On the Detection and Classification of Acoustic Scenes and Events (DCASE) 2018 ASC dataset, recorded with three devices, our proposed model performs significantly better than CNNs trained on single-device data.
description: IEEE Transactions on Multimedia
title: Statik und Einflussfunktionen - vom modernen Standpunkt aus
Creators: name: Hartmann, Friedel
name: Jahn, Peter
Publisher: name: Universität Kassel
Year: 2024
Subjects: subject: Statik
subject: Einflussfunktionen
subject: Satz von Betti
subject: Maxwell
subject: finite Elemente
subject: Randelemente
subject: Energieprinzipe
subject: Variationsprinzipe
subject: Prinzip der virtuellen Verrückung
subject: Prinzip der virtuellen Kräfte
subject: potentielle Energie
subject: Gleichgewicht
subject: Greensche Identitäten
subject: Stabtragwerke
subject: Flächentragwerke
subject: 620
subject: Green-Funktion
subject: Finite-Elemente-Methode
subject: Ansatzfunktion
subject: Baustatik
subject: Energieerhaltung
subject: Variationsprinzip
subject: Stabwerk
subject: Flächentragwerk

description: Vorangegangene englische Fassungen des Buchs sind im Springer-Verlag erschienen.
title: Сергей Павлович Розанов: семья, учеба, первые научные труды
title: Sergey Rozanov: Family, Studies, First Scientific Papers
Creators: name: Груздева, Е. Н.
Publisher: name: Реноме
Year: 2021

description: Статья рассказывает о традициях и укладе семьи Розановых, о детских и юношеских годах С. П. Розанова, о постепенном формировании интересов будущего историка литературы и его первых самостоятельных научных опытах. Впервые публикуется автобиография ученого, дающая яркие описания его детства и учебы.
description: The article reports on the traditions and the way of life of the Rozanovs, as well as the early life of Sergey Rozanov, the gradual formation of him as a literary historian and the first research of his own. The article first reveals the autobiography of Rozanov to give us a vivid account of his childhood and studies.
Three-dimensional supergravity reloaded
Creators: name: Giacomini, Alex
name: Troncoso, Ricardo
name: Willison, Steven
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The locally supersymmetric extension of the most general gravity theory in three dimensions leading to first order field equations for the vielbein and the spin connection is constructed. Apart from the Einstein-Hilbert term with cosmological constant, the gravitational sector contains the Lorentz-Chern-Simons form and a term involving the torsion each with arbitrary couplings. The supersymmetric extension is carried out for vanishing and negative effective cosmological constant, and it is shown that the action can be written as a Chern-Simons theory for the supersymmetric extension of the Poincare and AdS groups, respectively. The construction can be simply carried out by making use of a duality map between different gravity theories discussed here, which relies on the different ways to make geometry emerge from a single gauge potential. The extension for N =p+q gravitini is also performed.
description: LaTex 24 pages, no figures. Minor changes, references added. Accepted for publication on Class. Quant. Grav
Chimeras with uniformly distributed heterogeneity: two coupled populations
Creators: name: Laing, Carlo R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Dynamical Systems (math.DS)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Chimeras occur in networks of two coupled populations of oscillators when the oscillators in one population synchronise while those in the other are asynchronous. We consider chimeras of this form in networks of planar oscillators for which one parameter associated with the dynamics of an oscillator is randomly chosen from a uniform distribution. A generalisation of the approach in [C.R. Laing, Physical Review E, 100, 042211, 2019], which dealt with identical oscillators, is used to investigate the existence and stability of chimeras for these heterogeneous networks in the limit of an infinite number of oscillators. In all cases, making the oscillators more heterogeneous destroys the stable chimera in a saddle-node bifurcation. The results help us understand the robustness of chimeras in networks of general oscillators to heterogeneity.
description: To appear in Phys Rev E
The risks of the use of tolbutamide and related oral hypoglycemic drugs in the management of non-insulin-dependent diabetes mellitus
Creators: name: Lin, Wen Hong
Publisher: name: University of British Columbia
Year: 2009

description: The study of the University Group Diabetes Program and a number of other clinical studies have consistently demonstrated that the long-term treatment with tolbutamide and possibly other oral hypoglycemic sulfonylureas can increase cardiovascular mortality, especially the mortality due to myocardial infarction, in the patients with non - insulin - dependent diabetes mellitus (NIDDM). There are three hypotheses to explain this adverse effect. Hypothesis 1 is that tolbutamide causes myocardial infarction by increasing the cardiac metabolism of oxygen as the result of a positive inotropic effect. It is proposed that the pathological changes which occur in diabetic hearts make them particularly susceptible to this effect. Tolbutamide has positive inotropic effects both in vivo and in vitro. Hypothesis 2 is that tolbutamide causes or worsens hyperinsulinemia which may directly or indirectly be associated with the coronary heart disease in patients with NIDDM . Tolbutamide induces the secretion of insulin from the pancreatic beta cells. Since patients with NIDDM often have high circulating insulin levels , the treatment with tolbutamide can worsen the hyperinsulinemia in NIDDM patients. When taken together, epidemiological, prospective and clinically cross - sectional studies demonstrate that insulin resistance and compensatory hyperinsulinemia correlated with increased risk of coronary heart disease . Therefore, the long-term administration of tolbutamide could increase the incidence and severity of coronary heart disease . Hypothesis 3 is that tolbutamide has an arrhythmogenic effect. One possible mechanism is that tolbutamide, through its action in blocking ATP-regulated potassium (KATP) channels, may cause arrhythmias by blocking cardiac ATP-regulated potassium channels during myocardial ischemia. During ischemia, the KATP channels are opened by the decrease of the intracellular ATP level; the opening of the KATP channel results in a shorting of the action potential which decreases the contraction of heart muscle, thus protecting the damaged portion. Tolbutamide, by blocking the KATP channels during the myocardial ischemia, prevents the decrease of the contraction of the heart muscle, resulting in increased energy consumption in the ischemic heart, and increasing the risk of potentially fatal dysrhythmias. Other presently unknown mechanisms for arrhythmias are also possible. There is sufficient evidence and plausible mechanisms whereby tolbutamide may lead to adverse cardiovascular outcome. Therefore, until better evidence is available, the safest therapy for asymptomic non-insulin-dependent diabetics is diet restriction plus physical exercise.
Transmittance and near-field characterization of sub-wavelength tapered optical fibers
Creators: name: Orucevic, Fedja
name: Lefèvre-Seguin, Valérie
name: Hare, Jean
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We have produced high transmission sub-wavelength tapered optical fibers for the purpose of whispering gallery mode coupling in fused silica microcavities at 780 nm. A detailed analysis of the fiber transmittance evolution during tapering is demonstrated to reflect precisely the mode coupling and cutoff in the fiber. This allows to control the final size, the number of guided modes and their effective index. These results are checked by evanescent wave mapping measurements on the resulting taper.
Choose your own adventure to a reproducible scientific article: learnings from ReproHack
Creators: name: D'Andrea, Florencia
Publisher: name: Zenodo
Year: 2021
Subjects: Open Science
Scientific Reproducibility
Research Software
Research Compendium

description: Toronto Data Workshop on Reproducibility - 26 February 2021 "I shared the code and data of my last scientific article, does it mean that it is reproducible?" We could think that having access to the research data and code would be enough to reproduce published results, but often this is much more involved. Is reproducibility dependent on the reviewer's knowledge? What things do we not usually think about can affect reproducibility? Can the choice of how to capture the computational environment influence the experience of the reviewer? In this talk, we are going to think together some of the necessary steps that make someone else able to reproduce a scientific article or project. I will share some thoughts from my experience in ReproHack and show you how reviewing is a great practice to learn about reproducibility. What is ReproHack? Reprohack is a hackathon-style event focused on the reproducibility of research results. These hackathons provide a low-pressure sandbox environment for practicing reproducible research: Authors can practice producing reproducible research and receive friendly feedback and appreciation of their efforts Participants can practice reviewing, learn about reproducibility best practices as well as common pitfalls from working with real-life materials rather than just dummy. They also get inspired and grow confidence in working more openly themselves. Research Community benefits from: Evaluating what best practice is in practice More practice in both developing and reviewing materials Illustrations The Turing Way Community, & Scriberia. (2020, March 3). Illustrations from the Turing Way book dashes. Zenodo. http://doi.org/10.5281/zenodo.3695300 Links to the slides: bit.ly/reprohack_toronto https://flor14.github.io/toronto_data_workshop/what_i_learned_from_reprohack.html
Short and long range correlated motion observed in colloidal glasses and liquids
Creators: name: Weeks, Eric R.
name: Crocker, John C.
name: Weitz, David A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We use a confocal microscope to examine the motion of individual particles in a dense colloidal suspension. Close to the glass transition, particle motion is strongly spatially correlated. The correlations decay exponentially with particle separation, yielding a dynamic length scale of O(2-3 sigma) (in terms of particle diameter sigma). This length scale grows modestly as the glass transition is approached. Further, the correlated motion exhibits a strong spatial dependence on the pair correlation function g(r). Motion within glassy samples is weakly correlated, but with a larger spatial scale for this correlation.
description: Submitted to J Phys: Cond Mat; for Workshop on Nonequilibrium Phenomena in Glasses (Pisa, September 2006)
Principles of wide bandwidth acoustic detectors and the single-mass DUAL detector
Creators: name: Bonaldi, Michele
name: Cerdonio, Massimo
name: Conti, Livia
name: Falferi, Paolo
name: Leaci, Paola
name: Odorizzi, Stefano
name: Prodi, Giovanni A.
name: Saraceni, Mario
name: Serra, Enrico
name: Zendri, Jean Pierre
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We apply the standard theory of the elastic body to obtain a set of equations describing the behavior of an acoustic Gravitational Wave detector, fully taking into account the 3-dimensional properties of the mass, the readout and the signal. We show that the advantages given by a Dual detector made by two nested oscillators can also be obtained by monitoring two different acoustic modes of the same oscillator, thus easing the detector realization. We apply these concepts and by means of an optimization process we derive the main figures of such a single-mass Dual detector designed specifically for the frequency interval 2-5kHz. Finally we calculate the SQL sensitivity of this detector.
description: 29 pages, 10 figures
The process $\epem\to J/ ψX(3940)$ at $\sqrt s = 10.6$ GeV in the framework of light cone formalism
Creators: name: Braguta, V. V.
name: Likhoded, A. K.
name: Luchinsky, A. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This paper is devoted to the study of the process $\epem\to J/ψX(3940)$ in the framework of light cone formalism. In our calculation two hypotheses about the structure of X(3940) meson are considered: X(3940) is $3^1$S$_0$ state and X(3940) is one of $2^3$P states. The former hypothesis leads to a good agreements with the cross section measured at the experiment. As to the latter one, it is proposed a mechanism that allows one to understand the suppression of 2P mesons production in hard processes.
description: minor changes
A Central Limit Theorem for Convex Sets
Creators: name: Klartag, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Metric Geometry (math.MG)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: Suppose X is a random vector, that is distributed uniformly in some n-dimensional convex set. It was conjectured that when the dimension n is very large, there exists a non-zero vector u, such that the distribution of the real random variable is close to the gaussian distribution. A well-understood situation, is when X is distributed uniformly over the n-dimensional cube. In this case, is approximately gaussian for, say, the vector u = (1,...,1) / sqrt(n), as follows from the classical central limit theorem. We prove the conjecture for a general convex set. Moreover, when the expectation of X is zero, and the covariance of X is the identity matrix, we show that for 'most' unit vectors u, the random variable is distributed approximately according to the gaussian law. We argue that convexity - and perhaps geometry in general - may replace the role of independence in certain aspects of the phenomenon represented by the central limit theorem.
description: 41 pages; references added, proofs of standard lemmas omitted
Produciendo mi próximo artículo científico con R: Compendios de Investigación, Reproducibilidad e Interactividad en las publicaciones académicas
Creators: name: D'Andrea, Florencia
Publisher: name: Zenodo
Year: 2020
Subjects: ciencia abierta
reproducibilidad computacional
software para investigacion
compendios de investigación

description: Muchas personas han migrado desde distintos tipos de software a usar R y RStudio para realizar los análisis de datos que luego formarán parte de publicaciones. Surge una pregunta disparadora: ¿Qué hacemos con el código y los datos producto de nuestras investigaciones? El arte de compartir Un Compendio de Investigación es una forma ordenada de dejar disponible manuscrito, datos y código para que como investigadores podamos reproducir tanto los resultados como el artículo facilmente. ¡Y además se puede crear desde R! Donde antes usabas un editor de texto, ahora podes usar RMarkdown ¿Cómo entra en juego dentro del compendio?¿Por qué debería incluir una licencia para el código y los datos de mi investigación?. R nos abre muchas posibilidades al momento de comunicar a otros investigadores o al público en general nuestros resultados de una forma más efectiva ¿Podemos publicar gráficos interactivos con {plotly} o dejar disponibles shiny apps?¿Cómo? ¿Estás lista/o para hacer ciencia abierta? Algunas revistas comienzan requirir el acceso al código y bases de datos para un mayor impacto de sus artículos ¿Por qué es necesario asegurar lo más posible la reproducibilidad computacional? Mencionaremos algunas herramientas de R que pueden ayudarte a mejorar de forma sencilla reproducibilidad, como el paquete {renv}. Finalmente, reflexionemos: ¿Qué ventajas/desventajas tiene liberar nuestros datos y código?¿Preferimos calidad o cantidad en lo que refiere a los artículos científicos? ¿Debería ser así? Ilustraciones The Turing Way Community, & Scriberia. (2020, March 3). Illustrations from the Turing Way book dashes. Zenodo. http://doi.org/10.5281/zenodo.3695300 Filminas disponibles online en los siguientes links: bit.ly/rladiesjujuy-primerevento https://flor14.github.io/rladies-jujuy/presentacion.html Esta presentación fue una charla para el primer meetup de R-Ladies Jujuy, Argentina  ¡Fin de año y primer meetup de R-Ladies Jujuy! Te esperamos en lunes 21 de diciembre de 2020 a las 17hs para charlar y compartir información de paquetes de R, herramientas, ciencia y principios FAIR en un ambiente amigable y distendido ¡Además presentaremos a este nuevo capítulo de R-Ladies en Argentina! No te lo podes perder
Quantum integrability and nonintegrability in the spin-boson model
Creators: name: Stepanov, Vyacheslav V.
name: Muller, Gerhard
name: Stolze, Joachim
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We study the spectral properties of a spin-boson Hamiltonian that depends on two continuous parameters $0\leqΛ
Structural concept of ECHO - Hybrid bonding and laminar joints
Creators: name: Schollerer, Martin
name: Ückert, Christian
name: Hühne, Christian
Publisher: name: Zenodo
Year: 2022
Subjects: HLFC, HTP, Joint cover, laminar interface, waviness

description: Th Clean Sky 2 project ECHO focus on the integration of an hybrid laminar flow control (HLFC) system on an horizontal stabilizer for a long range aircraft. HLFC extracts a part of the boundary layer in order to stabilize the flow and thus reduce the drag on the airfoil. The transition from laminar to turbulent flow has to be delayed on the airfoil far behind the leading edge. Therfore, the the horizontal stabiliser box has tight tolerances and a minimal amount of gaps and steps. A common approach to reduce gaps are fillers, but this process is time consuming and an exact geometry cannot guaranteed due to strong thermal expansion of the filler. This new design concept uses a pre-curved steel foil to cover the bolts at the gap between leading edge and box. The sheet is bonded on the titanium leading edge after leading edge has been assembled. This ensures both the accessibility of the fastening elements in the case of maintenance, as well as complying with the aerodynamic requirements.
Superconductivity near the saddle point in the two-dimensional Rashba system Si(111)-$\sqrt{3}\times\sqrt{3}$-(Tl,Pb)
Creators: name: Machida, T.
name: Yoshimura, Y.
name: Nakamura, T.
name: Kohsaka, Y.
name: Hanaguri, T.
name: Hsing, C. -R.
name: Wei, C. -M.
name: Hasegawa, Y.
name: Hasegawa, S.
name: Takayama, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Two-dimensional Rashba superconductor Si(111)-$\sqrt{3}\times\sqrt{3}$-(Tl,Pb) is a candidate platform of mixed spin-singlet and -triplet superconductivity. A recent scanning tunneling microscope (STM) experiment revealed a pseudogap at the vortex core, suggesting the finite triplet component [T. Nakamura $\textit{et al.}$, Phys. Rev. B $\bf{ 98}$, 134505 (2018)]. Detailed spectroscopic information of the superconducting gap and the low-energy band structure is necessary to establish the putative triplet superconductivity. Here, we performed high-energy-resolution spectroscopic imaging experiments on Si(111)-$\sqrt{3}\times\sqrt{3}$-(Tl,Pb) using an ultra-low temperature STM. We found that various spectroscopic features, including the vortex-core spectrum, are consistent with spin-singlet $s$-wave superconductivity, having no sign of the triplet component. The apparent contradiction with the previous STM result suggests that the nature of superconductivity changes within the same system. From the analysis of the quasiparticle interference patterns, we found that the Fermi energy is in the close vicinity of the saddle point near the $\overline{\rm{M}}$ point. We speculate that the nature of superconductivity varies depending on the saddle-point energy with respect to the Fermi energy, which is sample-dependent due to different band filling.
description: 23 pages, 7 figures
Factors of type II_1 without non-trivial finite index subfactors
Creators: name: Vaes, Stefaan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics

description: We call a subfactor trivial if it is isomorphic with the obvious inclusion of N into matrices over N. We prove the existence of type II_1 factors M without non-trivial finite index subfactors. Equivalently, every M-M-bimodule with finite coupling constant, both as a left and as a right M-module, is a multiple of L^2(M). Our results rely on the recent work of Ioana, Peterson and Popa, who proved the existence of type II_1 factors without outer automorphisms.
description: Smoothened presentation, final version
Tunneling between 2D electron layers with correlated disorder: anomalous sensitivity to spin-orbit coupling
Creators: name: Zyuzin, V. A.
name: Mishchenko, E. G.
name: Raikh, M. E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Tunneling between two-dimensional electron layers with mutually correlated disorder potentials is studied theoretically. Due to this correlation, the diffusive eigenstates in different layers are almost orthogonal to each other. As a result, a peak in the tunnel I-V characteristics shifts towards small bias, V. This "protects" the peak against the interaction-induced smearing, since the relaxation rate near the Fermi level is low. If the correlation in disorder potentials is complete, the peak position and width are governed by the spin-orbit coupling in the layers; this coupling lifts the orthogonality of the eigenstates. Possibility to use inter-layer tunneling for experimental determination of weak intrinsic spin-orbit splitting of the Fermi surface is discussed.
description: 5 pages, 5 figures; published version, minor changes
Thermally driven fission of protocells
Creators: name: Attal, Romain
Publisher: name: arXiv
Year: 2021
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We propose a simple mechanism for the self-replication of protocells. Our main hypothesis is that the amphiphilic molecules composing the membrane bilayer are synthesised inside the protocell through globally exothermic chemical reactions. The slow increase of the inner temperature forces the hottest molecules to move from the inner leaflet to the outer leaflet of the bilayer. This asymmetric translocation process makes the outer leaflet grow faster than the inner leaflet. This differential growth increases the mean curvature and amplifies any local shrinking of the protocell until it splits in two.
Observation of phonon structure in electron density of states of normal metal
Creators: name: Knigavko, A.
name: Carbotte, J. P.
name: Marsiglio, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Within standard treatments of the interacting electron--phonon system the electron density of states (EDOS) shows no sign of the phonons when the system is in the normal state. On the other hand, emergence of a fine energy scale in the superconducting state makes the phonons readily observable in the EDOS and other spectroscopic quantities. Here we wish to re-examine the conditions under which phonon structure might be present in the normal state. Accounting for a finite, i.e. non-infinite, electronic bandwidth results in easily distinguishable phonon structure in the EDOS. We argue that for narrow band metals, the resolution of photoemission spectroscopy is sufficient for resolving these structures. Manifestations of finite band effects in $K_3C_{60}$ are discussed.
Bethe eigenvectors of higher transfer matrices
Creators: name: Mukhin, E.
name: Tarasov, V.
name: Varchenko, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider the XXX-type and Gaudin quantum integrable models associated with the Lie algebra $gl_N$. The models are defined on a tensor product irreducible $gl_N$-modules. For each model, there exist $N$ one-parameter families of commuting operators on the tensor product, called the transfer matrices. We show that the Bethe vectors for these models, given by the algebraic nested Bethe ansatz are eigenvectors of higher transfer matrices and compute the corresponding eigenvalues.
description: 48 pages, amstex.tex (ver 2.2), misprints corrected
title: Прикомандирован к Петербургскому университету, или Почему С. П. Розанов не стал профессором
title: The Attached to St. Petersburg University, or the Reason why Sergey Rozanov did not Become a Professor
Creators: name: Груздева, Е. Н.
Publisher: name: Реноме
Year: 2021

description: Статья освещает период магистрантства С. П. Розанова в 1903–1907 гг. Его научная деятельность была очень плодотворной и успешной. За пять лет никому не известный кандидат приобрел известность и уважение в столичных ученых кругах. Тем более неожиданной оказалась постигшая его неудача на последнем экзамене. Архивные документы позволяют не только реконструировать события, но и составить представление об отношении к ним главного героя и его окружения.
description: The article covers the period from 1903 to 1907, when Sergey Rozanov was a postgraduate student. His scientific work was highly productive and successful that time. During five years, the graduate who had never been known before, could gain fame and distinction of the scholars of St. Petersburg. For this very reason, his failure in the last exam was totally unexpected. Archival documents not only let us restore the events, but also understand the reaction of Rozanov and those who knew him.
title: “Nobody asked me how I felt”. Childhood Memories of Exile among the Croatian post-WW2 Diaspora in Argentina
Creators: name: Židek, Nikolina
Publisher: name: Universität Graz
Year: 2021

description: Keywords: Croatia, WW2, 1.5 generation, memory, diaspora
description: Contemporary Southeastern Europe, 2021, 8(1), 1-18
Kicking the Rugby Ball: Perturbations of 6D Gauged Chiral Supergravity
Creators: name: Burgess, C. P.
name: de Rham, C.
name: Hoover, D.
name: Mason, D.
name: Tolley, A. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze the axially-symmetric scalar perturbations of 6D chiral gauged supergravity compactified on the general warped geometries in the presence of two source branes. We find all of the conical geometries are marginally stable for normalizable perturbations (in disagreement with some recent calculations) and the nonconical for regular perturbations, even though none of them are supersymmetric (apart from the trivial Salam-Sezgin solution, for which there are no source branes). The marginal direction is the one whose presence is required by the classical scaling property of the field equations, and all other modes have positive squared mass. In the special case of the conical solutions, including (but not restricted to) the unwarped `rugby-ball' solutions, we find closed-form expressions for the mode functions in terms of Legendre and Hypergeometric functions. In so doing we show how to match the asymptotic near-brane form for the solution to the physics of the source branes, and thereby how to physically interpret perturbations which can be singular at the brane positions.
description: 21 pages + appendices, references added
Prediction of Supersoft X-ray Phase during the 2006 Outburst of RS Ophiuchi
Creators: name: Hachisu, Izumi
name: Kato, Mariko
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: RS Ophiuchi is one of the well-observed recurrent novae and also a candidate progenitor of Type Ia supernovae. Its sixth recorded outburst was discovered on 12 February 2006. Detection of a supersoft X-ray phase will provide a firm confirmation of hydrogen shell-burning on the white dwarf and its turn-on/turn-off dates strongly constrain a mass range of the white dwarf, which clarify whether or not RS Oph becomes a Type Ia supernova. For a timely detection of its supersoft X-ray phase, we have calculated outburst evolution of RS Oph based on the optically thick wind theory and predicted a supersoft X-ray phase for the 2006 outburst: it will most probably start on day 80-90 and continue until day 110-120 after the optical maximum. Its duration is so short as only a month or so. We strongly recommend multiple observations during April, May, and June of 2006 to detect turn-on and turn-off times of the supersoft X-ray phase.
description: 4 pages including 4 figures, to appear in ApJL
title: Петербуржец на малороссийском хуторе
title: A Resident of St. Petersburg in a Ukrainian Khutor
Creators: name: Груздева, Е. Н.
Publisher: name: Реноме
Year: 2021

description: Спасаясь от голода и разрухи первых послереволюционных месяцев, многие жители столицы покидали Петроград. Решилась на отъезд и семья С. П. Розанова, имевшая на Черниговщине небольшой хутор. Статья рассказывает о том, как сложилась жизнь беженцев в новых условиях. Впервые публикуются письма С. П. Розанова к В. М. Истрину, которые помогают понять, что приобрели и что потеряли уехавшие петербуржцы, и почему они решили вернуться в Петроград.
description: Many residents of Petrograd (former St. Petersburg) used to leave the city to escape starvation and economic collapse, which had occurred soon after the Revolution of 1917. Sergey Rozanov and his family also determined to go away and to settle down in Chernigov Region (Ukraine), where they possessed a small farm (i. e. khutor). The article describes the refugees’ life in a very unusual situation. It also introduces the letters of Sergey Rozanov to Vasiliy Istrin, a colleague of Rozanov’s, to understand what such refugees lost in their native city of Petrograd and why they changed their minds and went back.
Spintronics-compatible approach to solving maximum satisfiability problems with probabilistic computing, invertible logic and parallel tempering
Creators: name: Grimaldi, Andrea
name: Sánchez-Tejerina1, Luis
name: Aadit, Navid Anjum
name: Chiappini, Stefano
name: Carpentieri, Mario
name: Camsari, Kerem
name: Finocchio, Giovanni
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The search of hardware-compatible strategies for solving NP-hard combinatorial optimization problems (COPs) is an important challenge of today s computing research because of their wide range of applications in real world optimization problems. Here, we introduce an unconventional scalable approach to face maximum satisfiability problems (Max-SAT) which combines probabilistic computing with p-bits, parallel tempering, and the concept of invertible logic gates. We theoretically show the spintronic implementation of this approach based on a coupled set of Landau-Lifshitz-Gilbert equations, showing a potential path for energy efficient and very fast (p-bits exhibiting ns time scale switching) architecture for the solution of COPs. The algorithm is benchmarked with hard Max-SAT instances from the 2016 Max-SAT competition (e.g., HG-4SAT-V150-C1350-1.cnf which can be described with 2851 p-bits), including weighted Max-SAT and Max-Cut problems.
description: 7 Figures, 20 pages
Effect of Magnetic Field Dissipation on Primordial Li Abundance
Creators: name: Lu, Yini
name: Kusakabe, Motohiko
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The dissipation effects of primordial magnetic fields on the primordial elemental abundances were investigated. When a magnetic field reconnects, its energy is converted to the kinetic energy of charged particles, as observed for solar energetic particles arriving on earth. This accelerates the cosmic background nuclei, and energetic nuclei induce nonthermal reactions. A constraint on the dissipation is derived from a theoretical calculation of the nonthermal reactions during Big Bang nucleosynthesis. We found that observations of the Li and D abundances can be explained if 0.01--0.1 % of the cosmic energy density was utilized for nuclear acceleration after the electron--positron annihilation epoch. Reconnections of such amplitudes of magnetic fields generate outgoing jets, the bulk velocity of which evolves to values appropriate for cosmic ray (CR) nuclear energies of 0.1--1 MeV necessary for successful CR nucleosynthesis. Therefore, acceleration of cosmic background nuclei during the dissipation of primordial magnetic fields is a possible generation mechanism of soft CRs that has been suggested as a solution to the cosmic Li problem. Among the solutions suggested without exotic physics, only the dissipating magnetic field model suggested here explains observations of both low Li and high D abundances. Our results demonstrate that signatures of strong magnetic fields in the early universe have been observed in primordial elemental abundances.
description: 15 pages, 5 figures, ApJL, in press
Soliton dynamics of a high-density Bose-Einstein condensate subject to a time varying anharmonic trap
Creators: name: Flores-Calderón, R.
name: Fujioka, J.
name: Espinosa-Cerón, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: In this paper we study the soliton dynamics of a high-density Bose-Einstein condensate (BEC) subject to a time-oscillating trap. The behavior of the BEC is described with a modified Gross-Pitaevskii equation (mGPE) which takes into account three-body losses, atomic feeding and quantum fluctuations (up to a novel high-density term). A variational approximation (VA) is used to study the behavior of a Gaussian pulse in a static double-well potential. Direct numerical solutions of the mGPE corroborate that the center of the pulse exhibits an oscillatory behavior (as the VA predicts), and show a novel phenomenon of fragmentation and regeneration (FR). It is shown that this FR process is destroyed if we consider a potential with a time-dependent quadratic term, but the FR survives if the time dependence is introduced in a cubic term. Comparison between the VA and the numerical solution revealed an excellent agreement when the oscillations of the pulse remain in one of the potential wells. The effects of the quantum fluctuating terms on the FR process are studied. Finally, variational results using a supergaussian trial function are obtained.
description: 13 pages, 16 figures. To be published in Chaos, Solitons and Fractals
Effect of top quark spin on the unparticle couplings in γγ\to t\bar{t}
Creators: name: Sahin, I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the potential of $γγ$ collisions to probe scalar unparticle couplings via top-antitop quark pair production. We find 95% confidence level limits on the unparticle couplings with an integrated luminosity of $500 fb^{-1}$ and $\sqrt{s}=1$ TeV energy. We investigate the effect of top quark spin polarization on the unparticle couplings. It is shown that spin polarization of the top quark leads to a significant improvement in the sensitivity limits.
description: 6 figures and 4 tables, limits for d_U=1.7 and 1.9 have been added, published version
On the behavior of the black hole candidate 1E 1740.7-2942's corona based on long-term INTEGRAL database
Creators: name: Stecchini, Paulo Eduardo
name: Leão, Jurandi
name: Castro, Manuel
name: D'Amico, Flavio
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: One of the most straightforward ways to explain the hard X-ray spectra observed in X-ray binaries is to assume that comptonization of soft photons from the accretion disk is occurring. The region where this process takes place, called the corona, is characterized by only two parameters: its thermal energy $kT$ and its optical depth $τ$. Hard X-ray spectra analysis is, thus, an imperative tool in diagnosing the behavior of these parameters. The lack of consistency in obtaining/analysing long-term databases, however, may have been hindering this kind of characterization from being attained. With the aim of better understanding the corona behavior in the black hole candidate 1E 1740.7-2942, we performed a homogeneous analysis for a large hard X-ray data set from the ISGRI telescope on-board the INTEGRAL satellite. Results from modelling the spectra show that, for most of our sample, unsaturated thermal comptonization is the main mechanism responsible for the hard X-ray spectra observed in 1E 1740.7-2942. Moreover, such extensive database allowed us to produce what is probably the longest hard X-ray light curve of 1E 1740.7-2942 and whose units -- due to recent findings regarding dynamical quantities of the system -- could be expressed in % of Eddington's luminosity.
description: Contribution to the IWARA 2020 conference's proceedings, to be published by the Astronomische Nachrichten