cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A timestepper approach for the systematic bifurcation and stability analysis of polymer extrusion dynamics
Creators: name: Kavousanakis, M. E.
name: Russo, L.
name: Siettos, C. I.
name: Boudouvis, A. G.
name: Georgiou, G. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We discuss how matrix-free/timestepper algorithms can efficiently be used with dynamic non-Newtonian fluid mechanics simulators in performing systematic stability/bifurcation analysis. The timestepper approach to bifurcation analysis of large scale systems is applied to the plane Poiseuille flow of an Oldroyd-B fluid with non-monotonic slip at the wall, in order to further investigate a mechanism of extrusion instability based on the combination of viscoelasticity and nonmonotonic slip. Due to the nonmonotonicity of the slip equation the resulting steady-state flow curve is nonmonotonic and unstable steady-states appear in the negative-slope regime. It has been known that self-sustained oscillations of the pressure gradient are obtained when an unstable steady-state is perturbed [Fyrillas et al., Polymer Eng. Sci. 39 (1999) 2498-2504]. Treating the simulator of a distributed parameter model describing the dynamics of the above flow as an input-output black-box timestepper of the state variables, stable and unstable branches of both equilibrium and periodic oscillating solutions are computed and their stability is examined. It is shown for the first time how equilibrium solutions lose stability to oscillating ones through a subcritical Hopf bifurcation point which generates a branch of unstable limit cycles and how the stable periodic solutions lose their stability through a critical point which marks the onset of the unstable limit cycles. This implicates the coexistence of stable equilibria with stable and unstable periodic solutions in a narrow range of volumetric flow rates.
title: Langeweile und Ekstase
Creators: name: Akademie, Die
Publisher: name: MyCoRe Community
Year: 2014
Subjects: subject: Zeitwahrnehmung
subject: Gefühl
subject: Stockfotos
subject: Woodstock-Effekt
subject: Nichtstun
subject: Hochschulsystem
subject: Visualisierung von Forschungsergebnissen
subject: Nachhaltigkeit
subject: Arab-German Young Academy of Sciences and Humanities
subject: Young Academy of Scotland
subject: 000

description: Langeweile ist ein besonders intensiver Gefühlszustand. Das behauptet Zeitforscher Marc Wittmann im Gespräch mit Jule Specht, Psychologin und Mitglied der Jungen Akademie (JA). Wie viel Zeitempfinden, und damit das Empfinden von Langeweile oder Ekstase, mit Körperlichkeit zu tun hat, wird bei Specht und Wittmann sehr deutlich – sei es im Fußball, als Überlebensstrategie oder in unterschiedlichen Lebensphasen als Kind oder als alter Mensch. Die Zeit und ihre Wahrnehmung ist das verbindende Element der Texte im Dossier dieses Junge Akademie Magazins (JAM) zu Ekstase und Langeweile. Was den JA-Mitgliedern zu diesen zwei Schlagworten einfällt, lesen Sie in den Wortwolken auf den Umschlaginnenseiten. Wie sich Langeweile und Kurzweil sprach- und kulturhistorisch entwickelt haben, zeigt Henrike Manuwald, Juniorprofessorin für Germanistische Mediävistik: Weile bezeichnet eine Zeitspanne, deren Dauer durch das Adjektiv näher bestimmt wird. Der Komponist und Musikwissenschaftler Gordon Kampe untersucht ein Internetvideo mit dem Titel „Musik aus Langeweile“, und das auf höchst amüsante und kurzweilige Weise. In unserem Porträt stellen wir Ihnen JA-Mitglied Daniel Chappell vor. Der Mediziner weiß aus seinem Klinikalltag: Dem Patienten geht es gut, wenn dem Anästhesisten langweilig ist. Julian Klein, Komponist, Theaterregisseur und JA-Alumnus, erklärt den Woodstock-Effekt – „Musik quasi als Droge, um sich in eine andere Realitätsebene zu begeben“ – und zeigt, dass Ekstase der Kunst abträglich sein kann: Ein Verlust an Konzentration und Kontrolle auf der Bühne kann sogar gefährlich werden. Wird Langeweile also unterschätzt und Ekstase überbewertet? Im zweiten Teil des Heftes stellen wir Ihnen die laufenden Projekte unserer Arbeitsgruppen vor. Wir berichten über ein interdisziplinäres Symposium über das Lachen, die Suche nach unbekannten Räumen sowie über Ausflüge von JA-Alumni in die Welt des Films. Langeweile? Kennen wir in der Jungen Akademie jedenfalls nicht. Viel Freude beim Lesen wünscht Ihnen im Namen des Redaktionsteams Evelyn Runge
description: Junge Akademie Magazin, vol. 18
title: Ennui and ecstasy
Creators: name: Akademie, Die
Publisher: name: MyCoRe Community
Year: 2014
Subjects: subject: Zeitwahrnehmung
subject: Gefühl
subject: Stockfotos
subject: Woodstock-Effekt
subject: Nichtstun
subject: Hochschulsystem
subject: Visualisierung von Forschungsergebnissen
subject: Nachhaltigkeit
subject: Arab-German Young Academy of Sciences and Humanities
subject: Young Academy of Scotland
subject: 000

description: Boredom is a particularly intense emotional state, says time expert Marc Wittmann in an interview with psychologist and Junge Akademie (JA) member Jule Specht. The correlation between our perception of time – with its concomitant perception of boredom and ecstasy – and physicality is revealed in their conversation, be it in relation to football, as a survival strategy or in the various phases of a child’s or older person’s life. Time and our perception of time is the theme connecting the texts in the Dossier of this Junge Akademie Magazin (JAM) on Ennui and Ecstasy. You can find the JA members’ associations with these two key words in the tag clouds on the inside covers of this issue. Henrike Manuwald, junior professor in German mediaeval studies, explains the etymology and cultural history of the terms boredom/ennui (Langeweile) and diversion/pastime (Kurzweil): Weile (literally: while) denotes a period of time, the length of which is modified by the adjective (lang and kurz, respectively). The composer and musicologist Gordon Kampe analyses an internet video entitled “Music out of Boredom” in a most amusing and “distracting” manner. Our portrait features JA member Daniel Chappell, whose clinical experience has taught him that when the anaesthetist is bored, the patient is doing well. Julian Klein, composer, stage director and JA alumnus, explains the Woodstock Effect – ‘music as a kind of drug to transport us to a different level of reality’ – and reveals that ecstasy can have a detrimental effect on art: a loss of concentration and control on stage might even be dangerous. So, is boredom underrated and ecstasy overrated? In the second part of this issue we showcase the ongoing projects of our Research Groups. We report on an interdisciplinary symposium on laughter, the search for unknown spaces and JA alumni’s forays into the world of film. Boredom? Not something we are familiar with at the Junge Akademie. The editorial team and I hope you will enjoy this issue! Evelyn Runge
description: Junge Akademie Magazin, vol. 18
A Search for CO(J=3-2) Emission from the Host Galaxy of GRB 980425 with the Atacama Submillimeter Telescope Experiment
Creators: name: Hatsukade, Bunyo
name: Kohno, Kotaro
name: Endo, Akira
name: Tosaki, Tomoka
name: Ohta, Kouji
name: Sakamoto, Seiichi
name: Kawai, Nobuyuki
name: Cortes, Juan R.
name: Nakanishi, Kouichiro
name: Okuda, Takeshi
name: Muraoka, Kazuyuki
name: Sakai, Takeshi
name: Vreeswijk, Paul M.
name: Ezawa, Hajime
name: Yamaguchi, Nobuyuki
name: Kamegai, Kazuhisa
name: Kawabe, Ryohei
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on a deep search for CO(J=3-2) line emission from the host galaxy of GRB 980425 with the Atacama Submillimeter Telescope Experiment (ASTE). We observed five points of the galaxy covering the entire region. After combining all of the spectra, we obtained a global spectrum with the rms noise level of 3.3 mK in T_mb scale at a velocity resolution of 10 km s^-1. No significant emission was detected, though we find a marginal emission feature in the velocity range corresponding to the redshift of the galaxy. We derive 3 sigma upper limits on the global properties: the velocity-integrated CO(3-2) intensity of I_CO(3-2) < 0.26 K km s^-1 by adopting a velocity width of 67 km s^-1; the H_2 column density of N(H_2) < 3 x 10^20 cm^-2; the molecular gas mass of M(H_2) < 3 x 10^8 M_sun, by assuming a CO line luminosity to H_2 molecular gas mass conversion factor of X_CO = 5.0 x 10^20 cm^-2 (K km s^-1)^-1; and the star formation rate of SFR < 0.1 M_sun yr^-1, based on the Schmidt law. The SFR is consistent with the previous results of H_alpha and mid-IR observations, thereby suggesting that there is no significant obscured star formation in the host galaxy of GRB 980425. This result implies that there is a variety of GRB hosts with regard to the presence of obscured star formation.
description: 7 pages, 4 figures
Exchange shift of stripe domains in antiferromagnetically coupled multilayers
Creators: name: Kiselev, N. S.
name: Dragunov, I. E.
name: Roessler, U. K.
name: Bogdanov, A. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Antiferromagnetically coupled multilayers with perpendicular anisotropy, as [CoPt]/Ru, Co/Ir, Fe/Au, display ferromagnetic stripe phases as the ground states. It is theoretically shown that the antiferromagnetic interlayer exchange causes a relative shift of domains in adjacent layers. This ``exchange shift'' is responsible for several recently observed effects: an anomalous broadening of domain walls, the formation of so-called ``tiger-tail'' patterns, and a ``mixed state'' of antiferromagnetic and ferromagnetic domains in [CoPt]/Ru multilayers. The derived analitical relations between the values of the shift and the strength of antiferromagnetic coupling provide an effective method for a quantitative determination of the interlayer exchange interactions.
description: 4 pages, 3 figures
Equivalence of different descriptions for $η$ Particle in Simplest Little Higgs Model
Creators: name: Lu, Ran
name: Wang, Qing
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In SU(3) simplest little Higgs model, a characteristic particle is the light pseudoscalar boson eta, it leads interesting signals in the LHC/ILC and is studied in literature with different parameterizations. In this work, we show that these different descriptions for eta particle are equivalent up to some SU(3) rotations as long as we suitably redefine the pseudo Goldstone boson fields. We evaluate the necessary SU(3) rotations and built up explicit expressions for redefined fields.
description: 7 pages
Implementing a normative theory of communication in a framework for default reasoning
Creators: name: Csinger, Andrew
Publisher: name: University of British Columbia
Year: 2010

description: This thesis presents a framework for inter-agent communication, represented and partially implemented with default reasoning. I focus on the limited goal of determining the meaning for a Hearer-agent of an utterance ω by a Speaker-agent, in terms of the beliefs of the interlocutors. This meaning is generally more than just the explicit propositional contents of ω, and more than just the Speaker's goal to convey her belief that ω. One way of determining this meaning is to let the Hearer take stock of the implicit components of the Speaker's utterances. Among the implicit components of the meaning of ω, I show in particular how to derive certain of its presuppositions with a set of default schemata using a framework for default reasoning. More information can be extracted from the communications channel between interlocutors by adopting a normative model of inter-agent communication, and using this model to explain or 'make sense' of the Speaker's utterances. I construct such a model expressed in terms of a set of default principles of communication using the same framework for default reasoning. The task of deriving the meaning of an utterance is similar to the job required of a user-interface, where the user is the Speaker-agent, and the interface itself is the Hearer-agent. The goal of a user-interface as Hearer is to make maximal use of the data moving along the communications channel between user and application. The result is an integrated theory of normative, inter-agent communications expressed within an ontologically and logically minimal framework. This work demonstrates the development and application of a methodology for the use of default reasoning. The implementation of the theory is also presented, along with a discussion of its applicability to practical user-interfacing. A view emerges of user-modelling as a component of a user-interface.
MUSIQА TА'LIMIDАGI DОLZАRB PEDАGОGIK MUАMMОLАRINING XОRIJIY TАJRIBАLАR АSОSIDА YECHIM TОPISHI
Creators: name: Jumаniyаzоv, Оllаbergаn
Publisher: name: Zenodo
Year: 2024

description: О‘zbekistоn Respublikаsining “Tа’lim tо‘g‘risidа”gi qоnuni bаrchа fаnlаr qаtоri musiqiy fаnlаr о‘qitilishigа hаm dаvlаt tа’lim stаndаrti tаlаblаrini qо‘ydi, shu аsоsdа о‘quv rejаlаr ishlаb chiqish vа о‘quv ishlаrini tаshkil etishni tаqаzо etаdi. Hоzirgi dаvrdа tа’lim tizimining bаrchа bо‘g‘inlаri, yаni mаktаbgаchа tа’lim tаshkilоtlаridаn tо оliy о‘quv dаrgоhlаridа о‘qitilаdigаn musiqiy fаnlаrgаchа ushbu tаlаb аsоsidа о‘qitilmоqdа.
Wind on the boundary for the Abelian sandpile model
Creators: name: Ruelle, Philippe
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We continue our investigation of the two-dimensional Abelian sandpile model in terms of a logarithmic conformal field theory with central charge c=-2, by introducing two new boundary conditions. These have two unusual features: they carry an intrinsic orientation, and, more strangely, they cannot be imposed uniformly on a whole boundary (like the edge of a cylinder). They lead to seven new boundary condition changing fields, some of them being in highest weight representations (weights -1/8, 0 and 3/8), some others belonging to indecomposable representations with rank 2 Jordan cells (lowest weights 0 and 1). Their fusion algebra appears to be in full agreement with the fusion rules conjectured by Gaberdiel and Kausch.
description: 26 pages, 4 figures
Breaking of Huygens-Fresnel principle in inhomogeneous Tomonaga-Luttinger liquids
Creators: name: Gluza, Marek
name: Moosavi, Per
name: Sotiriadis, Spyros
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Tomonaga-Luttinger liquids (TLLs) can be used to effectively describe one-dimensional quantum many-body systems such as ultracold atoms, charges in nanowires, superconducting circuits, and gapless spin chains. Their properties are given by two parameters, the propagation velocity and the Luttinger parameter. Here we study inhomogeneous TLLs where these are promoted to functions of position and demonstrate that they profoundly affect the dynamics: In general, besides curving the light cone, we show that propagation is no longer ballistically localized to the light-cone trajectories, different from standard homogeneous TLLs. Specifically, if the Luttinger parameter depends on position, the dynamics features pronounced spreading into the light cone, which cannot be understood via a simple superposition of waves as in the Huygens-Fresnel principle. This is the case for ultracold atoms in a parabolic trap, which serves as our main motivation, and we discuss possible experimental observations in such systems.
description: 23 pages, RevTeX, 10 figures; final published version
Recursive boson system in the Cuntz algebra ${\cal O}_{\infty}$
Creators: name: Kawamura, Katsunori
Publisher: name: arXiv
Year: 2007
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 47L55, 81T05, 17B10

description: Bosons and fermions are often written by elements of other algebras. M. Abe gave a recursive realization of the boson by formal infinite sums of the canonical generators of the Cuntz algebra ${\cal O}_{\infty}$. We show that such formal infinite sum always makes sense on a certain dense subspace of any permutative representation of ${\cal O}_{\infty}$. In this meaning, we can regard as if the algebra ${\cal B}$ of bosons was a unital $*$-subalgebra of ${\cal O}_{\infty}$ on a given permutative representation by keeping their unboundedness. By this relation, we compute branching laws arising from restrictions of representations of ${\cal O}_{\infty}$ on ${\cal B}$. For example, it is shown that the Fock representation of ${\cal B}$ is given as the restriction of the standard representation of ${\cal O}_{\infty}$ on ${\cal B}$.
description: 18 pp
On expectations, heterogeneity and the Phillips curve: Three essays in New Keynesian economics
Creators: name: A.B.P. Grimaud
Publisher: name: University of Amsterdam / Amsterdam University of Applied Sciences
Year: 2021
Subjects: Social Science

description: The following document is the research data management plan for Alex Grimaud’s PhD Dissertation at University of Amsterdam. The dissertation has been written between September 2017 and April 2021. The dissertation is
mainly a dissertation in theoretical and empirical macroeconomic modelling. All of the data used is public and freely available. The dissertation did not involve any public or private data collection. The dissertation did not use any
private, protected or sensitive information.
TRANSFORMING HIGHER EDUCATION IN THE DIGITAL ERA: THE ROLE OF SOCIAL MEDIA IN DRIVING INNOVATION AND SOCIAL CO-CREATION
Creators: name: NOER RAFIKAH ZULYANTI
name: AMIARTUTI KUSMANINGTYAS
name: ABDUL HALIK
Publisher: name: Zenodo
Year: 2024
Subjects: Customer Citizenship, Customer Participation, Dominant Logic Theory, Marketing, Service Innovation, Social Co-Creation and Social Media.

description: Abstract

The research investigates the impact of social media on customer citizenship behaviour and customer participation behaviour, as well as its effect on service innovation and social co-creation as moderating factors. This study adopts a quantitative approach and involves 170 student respondents affiliated with LPTNU in Province East Java, Indonesia. The data collected was analysed using SEM-PLS version 3.0. The results of the overall research justify the dominant logic theory of service and the interesting findings in this study are that in higher education environments, student engagement to generate new excellence or create creative things for more innovative services, only triggered by social media marketing activities. Social Co-creation is not able to moderate the influence of customer citizenship behaviour and customer participation behaviour on service innovation. The novelty of the research lies in the conceptual framework model by adding the role of social media. Therefore, colleges should always facilitate collaborative social interaction and provide student dialogue space to improve service facilities that can be provided through social media platforms.
Observation of condensed phases of quasi-planar core-softened colloids
Creators: name: Osterman, N.
name: Babič, D.
name: Poberaj, I.
name: Dobnikar, J.
name: Ziherl, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We experimentally study the condensed phases of repelling core-softened spheres in two dimensions. The dipolar pair repulsion between superparamagnetic spheres trapped in a thin cell is induced by a transverse magnetic field and softened by suitably adjusting the cell thickness. We scan a broad density range and we materialize a large part of the theoretically predicted phases in systems of core-softened particles, including expanded and close-packed hexagonal, square, chain-like, stripe/labyrinthine, and honeycomb phase. Further insight into their structure is provided by Monte Carlo simulations.
Optical Properties of Pentacene and Perfluoropentacene Thin Films
Creators: name: Hinderhofer, Alexander
name: Heinemeyer, Ute
name: Gerlach, Alexander
name: Kowarik, Stefan
name: Jacobs, Robert M. J.
name: Sakamoto, Youichi
name: Suzuki, Toshiyasu
name: Schreiber, Frank
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The optical properties of pentacene (PEN) and perfluoropentacene(PFP) thin films on various SiO2 substrates were studied using variable angle spectroscopic ellipsometry. Structural characterization was performed using X-ray reflectivity and atomic force microscopy. A uniaxial model with the optic axis normal to the sample surface was used to analyze the ellipsometry data. A Strong optical anisotropy was observed and enabled the direction of the transition dipole of the absorption bands to be determined. Furthermore, comparison of the optical constants of PEN and PFP thin films with the absorption spectra of the monomers in solution shows significant changes due to the crystalline environment. Relative to the monomer spectrum the HOMO-LUMO transition observed in PEN (PFP) thin film is reduced by 210 meV (280 meV). Surprisingly, a second absorption band in the PFP thin film shows a slight blueshift (40 meV) compared to the spectrum of the monomer with its transition dipole perpendicular to that of the first absorption band.
description: 6 pages, 6 figures, submitted to J. Chem. Phys
MOESM1 of 3D-tips: user-friendly mesh barrier pipette tips for 3D-spheroid culture
Creators: name: Chen, Mo
name: Vial, Marie-Laure
name: St John, James
Publisher: name: figshare
Year: 2019
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Mathematical Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 1: Table S1. Quantitative comparison between the 3D-tip method, the 50/50 media exchange method (normal tip) and the centrifugation method.
Nonfrustrated magnetoelectric with incommensurate magnetic order in magnetic field
Creators: name: Syromyatnikov, A. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss a model nonfrustrated magnetoelectric in which strong enough magnetoelectric coupling produces incommensurate magnetic order leading to ferroelectricity. Properties of the magnetoelectric in magnetic field directed perpendicular to wave vector describing the spin helix are considered in detail. Analysis of classical energy shows that in contrast to naive expectation the onset of ferroelectricity takes place at a field $H_{c1}$ that is lower than the saturation field $H_{c2}$. One has $H_{c1}=H_{c2}$ at strong enough magnetoelectric coupling. We show that at H=0 the ferroelectricity appears at $T=T_{FE}
description: 12 pages, 3 figures, accepted in JETP
MSRF-Net: A Multi-Scale Residual Fusion Network for Biomedical Image Segmentation
Creators: name: Srivastava, Abhishek
name: Jha, Debesh
name: Chanda, Sukalpa
name: Pal, Umapada
name: Johansen, Håvard D.
name: Johansen, Dag
name: Riegler, Michael A.
name: Ali, Sharib
name: Halvorsen, Pål
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: Methods based on convolutional neural networks have improved the performance of biomedical image segmentation. However, most of these methods cannot efficiently segment objects of variable sizes and train on small and biased datasets, which are common for biomedical use cases. While methods exist that incorporate multi-scale fusion approaches to address the challenges arising with variable sizes, they usually use complex models that are more suitable for general semantic segmentation problems. In this paper, we propose a novel architecture called Multi-Scale Residual Fusion Network (MSRF-Net), which is specially designed for medical image segmentation. The proposed MSRF-Net is able to exchange multi-scale features of varying receptive fields using a Dual-Scale Dense Fusion (DSDF) block. Our DSDF block can exchange information rigorously across two different resolution scales, and our MSRF sub-network uses multiple DSDF blocks in sequence to perform multi-scale fusion. This allows the preservation of resolution, improved information flow and propagation of both high- and low-level features to obtain accurate segmentation maps. The proposed MSRF-Net allows to capture object variabilities and provides improved results on different biomedical datasets. Extensive experiments on MSRF-Net demonstrate that the proposed method outperforms the cutting-edge medical image segmentation methods on four publicly available datasets. We achieve the dice coefficient of 0.9217, 0.9420, and 0.9224, 0.8824 on Kvasir-SEG, CVC-ClinicDB, 2018 Data Science Bowl dataset, and ISIC-2018 skin lesion segmentation challenge dataset respectively. We further conducted generalizability tests and achieved a dice coefficient of 0.7921 and 0.7575 on CVC-ClinicDB and Kvasir-SEG, respectively.
Performance monitoring in transputer-based multicomputer networks
Creators: name: Jiang, Jie Cheng
Publisher: name: University of British Columbia
Year: 2010

description: Parallel architectures, like the transputer-based multicomputer network, offer potentially enormous computational power at modest cost. However, writing programs on a multicomputer to exploit parallelism is very difficult due to the lack of tools to help users understand the run-time behavior of the parallel system and detect performance bottlenecks in their programs. This thesis examines the performance characteristics of parallel programs in a multicomputer network, and describes the design and implementation of a real-time performance monitoring tool on transputers. We started with a simple graph theoretical model in which a parallel computation is represented as a weighted directed acyclic graph, called the execution graph. This model allows us to easily derive a variety of performance metrics for parallel programs, such as program execution time, speedup, efficiency, etc. From this model, we also developed a new analysis method called weighted critical path analysts (WCPA), which incorporates the notion of parallelism into critical path analysis and helps users identify the program activities which have the most impact on performance. Based on these ideas, the design of a real-time performance monitoring tool was proposed and implemented on a 74-node transputer-based multicomputer. Major problems in parallel and distributed monitoring addressed in this thesis are: global state and global clock, minimization of monitoring overhead, and the presentation of meaningful data. New techniques and novel approaches to these problems have been investigated and implemented in our tool. Lastly, benchmarks are used to measure the accuracy and the overhead of our monitoring tool. We also demonstrate how this tool was used to improve the performance of an actual parallel application by more than 50%.
Superintegrability on sl(2)-coalgebra spaces
Creators: name: Ballesteros, Angel
name: Herranz, Francisco J.
name: Ragnisco, Orlando
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We review a recently introduced set of N-dimensional quasi-maximally superintegrable Hamiltonian systems describing geodesic motions, that can be used to generate "dynamically" a large family of curved spaces. From an algebraic viewpoint, such spaces are obtained through kinetic energy Hamiltonians defined on either the sl(2) Poisson coalgebra or a quantum deformation of it. Certain potentials on these spaces and endowed with the same underlying coalgebra symmetry have been also introduced in such a way that the superintegrability properties of the full system are preserved. Several new N=2 examples of this construction are explicitly given, and specific Hamiltonians leading to spaces of non-constant curvature are emphasized.
description: 12 pages. Based on the contribution presented at the "XII International Conference on Symmetry Methods in Physics", Yerevan (Armenia), July 2006. To appear in Physics of Atomic Nuclei
Toward Orbital-Free Density Functional Theory with Small Data Sets and Deep Learning
Creators: name: Ryczko, Kevin
name: Wetzel, Sebastian J.
name: Melko, Roger G.
name: Tamblyn, Isaac
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We use voxel deep neural networks to predict energy densities and functional derivatives of electron kinetic energies for the Thomas-Fermi model and Kohn-Sham density functional theory calculations. We show that the ground-state electron density can be found via direct minimization for a graphene lattice without any projection scheme using a voxel deep neural network trained with the Thomas-Fermi model. Additionally, we predict the kinetic energy of a graphene lattice within chemical accuracy after training from only 2 Kohn-Sham density functional theory (DFT) calculations. We identify an important sampling issue inherent in Kohn-Sham DFT calculations and propose future work to rectify this problem. Furthermore, we demonstrate an alternative, functional derivative-free, Monte Carlo based orbital free density functional theory algorithm to calculate an accurate 2-electron density in a double inverted Gaussian potential with a machine-learned kinetic energy functional.
Genetic progression and the waiting time to cancer
Creators: name: Beerenwinkel, Niko
name: Antal, Tibor
name: Dingli, David
name: Traulsen, Arne
name: Kinzler, Kenneth W.
name: Velculescu, Victor E.
name: Vogelstein, Bert
name: Nowak, Martin A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: Cancer results from genetic alterations that disturb the normal cooperative behavior of cells. Recent high-throughput genomic studies of cancer cells have shown that the mutational landscape of cancer is complex and that individual cancers may evolve through mutations in as many as 20 different cancer-associated genes. We use data published by Sjoblom et al. (2006) to develop a new mathematical model for the somatic evolution of colorectal cancers. We employ the Wright-Fisher process for exploring the basic parameters of this evolutionary process and derive an analytical approximation for the expected waiting time to the cancer phenotype. Our results highlight the relative importance of selection over both the size of the cell population at risk and the mutation rate. The model predicts that the observed genetic diversity of cancer genomes can arise under a normal mutation rate if the average selective advantage per mutation is on the order of 1%. Increased mutation rates due to genetic instability would allow even smaller selective advantages during tumorigenesis. The complexity of cancer progression thus can be understood as the result of multiple sequential mutations, each of which has a relatively small but positive effect on net cell growth.
description: Details available as supplementary material at http://www.people.fas.harvard.edu/~antal/publications.html
An Automated Evaluation Metric for Chinese Text Entry
Creators: name: Jiang, Mike Tian-Jian
name: Zhan, James
name: Lin, Jaimie
name: Lin, Jerry
name: Hsu, Wen-Lien
Publisher: name: arXiv
Year: 2007
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: In this paper, we propose an automated evaluation metric for text entry. We also consider possible improvements to existing text entry evaluation metrics, such as the minimum string distance error rate, keystrokes per character, cost per correction, and a unified approach proposed by MacKenzie, so they can accommodate the special characteristics of Chinese text. Current methods lack an integrated concern about both typing speed and accuracy for Chinese text entry evaluation. Our goal is to remove the bias that arises due to human factors. First, we propose a new metric, called the correction penalty (P), based on Fitts' law and Hick's law. Next, we transform it into the approximate amortized cost (AAC) of information theory. An analysis of the AAC of Chinese text input methods with different context lengths is also presented.
description: 8 pages
Markov random fields in visual reconstruction : a transputer-based multicomputer implementation
Creators: name: Siksik, Ola
Publisher: name: University of British Columbia
Year: 2010

description: Markov Random Fields (MRFs) are used in computer vision as an effective method for reconstructing a function starting from a set of noisy, or sparse data, or in the integration of early vision processes to label physical discontinuities. The MRF formalism is attractive because it enables the assumptions used to be explicitly stated in the energy function. The drawbacks of such models have been the computational complexity of the implementation, and the difficulty in estimating the parameters of the model. In this thesis, the deterministic approximation to the MRF models derived by Girosi and Geiger[10] is investigated, and following that approach, a MIMD based algorithm is developed and implemented on a network of T800 transputers under the Trollius operating system. A serial version of the algorithm has also been implemented on a SUN 4 under Unix. The network of transputers is configured as a 2-dimensional mesh of processors (currently 16 configured as a 4 x 4 mesh), and the input partitioning method is used to distribute the original image across the network. The implementation of the algorithm is described, and the suitability of the transputer for image processing tasks is discussed. The algorithm was applied to a number of images for edge detection, and produced good results in a small number of iterations.
Ab Initio Coupling of Jets to Collective Flow in the Opacity Expansion Approach
Creators: name: Sadofyev, Andrey V.
name: Sievert, Matthew D.
name: Vitev, Ivan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate the leading corrections to jet momentum broadening and medium-induced branching that arise from the velocity of the moving medium at first order in opacity. These results advance our knowledge of jet quenching and demonstrate how it couples to collective flow of the quark-gluon plasma in heavy-ion collisions and to the orbital motion of partons in cold nuclear matter in deep inelastic scattering at the electron-ion collider. We also compute the leading corrections to jet momentum broadening due to transverse gradients of temperature and density. We find that these effects lead to both anisotropic transverse momentum diffusion proportional to the medium velocity and anisotropic medium-induced radiation emitted preferentially in the direction of the flow. We isolate the relevant sub-eikonal corrections by working with jets composed of scalar particles with arbitrary color factors interacting with the medium by scalar QCD. Appropriate substitution of the color factors and light-front wave functions allow us to immediately apply the results to a range of processes including $q \rightarrow q g$ branching in real QCD. The resulting general expressions can be directly coupled to hydrodynamic simulations on an event-by-event basis to study the correlations between jet quenching and the dynamics of various forms of nuclear matter.
description: 94 pages, 12 figures, 1 table
Supplementary data, figures, tables and references from Relaxed selection in evolution of genes regulating limb development gives clue to variation in forelimb morphology of cetaceans and other mammals
Creators: name: Telizhenko, Valeriia
name: Kosiol, Carolin
name: McGowen, Michael
name: Gol'din, Pavel
Publisher: name: The Royal Society
Year: 2024
Subjects: classificationCode: 310499
subject: Evolutionary biology not elsewhere classified

description: TelizhenkoValeriia_supplementary_data_tables_figures_ESM.pdf
Evolution of dwarf galaxies in the Centaurus A group
Creators: name: Makarova, L.
name: Makarov, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider star formation properties of dwarf galaxies in Cen A group observed within our HST/ACS projects number 9771 and 10235. We model color-magnitude diagrams of the galaxies under consideration and measure star formation rate and metallicity dependence on time. We study environmental dependence of the galaxy evolution and probable origin of the dwarf galaxies in the group.
description: To appear in proceedings IAU Symp 244, 'Dark Galaxies and Lost Baryons', June 2007
Quantum storage on subradiant states in an extended atomic ensemble
Creators: name: Kalachev, Alexey
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A scheme for coherent manipulation of collective atomic states is developed such that total subradiant states, in which spontaneous emission is suppressed into all directions due to destructive interference between neighbor atoms, can be created in an extended atomic ensemble. The optimal conditions for creation of such states and suitability of them for quantum storage are discussed. It is shown that in order to achieve the maximum signal-to-noise ratio the shape of a light pulse to be stored and reconstructed using a homogeneously broadened absorbtion line of an atomic system should be a time-reversed regular part of the response function of the system. In the limit of high optical density, such pulses allow one to prepare collective subradiant atomic states with near flat spatial distribution of the atomic excitation in the medium.
description: V2: considerably revised (title, text). V3: minor changes - final version as published in PRA
Superintegrability on N-dimensional spaces of constant curvature from so(N+1) and its contractions
Creators: name: Herranz, Francisco J.
name: Ballesteros, Angel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: The Lie-Poisson algebra so(N+1) and some of its contractions are used to construct a family of superintegrable Hamiltonians on the ND spherical, Euclidean, hyperbolic, Minkowskian and (anti-)de Sitter spaces. We firstly present a Hamiltonian which is a superposition of an arbitrary central potential with N arbitrary centrifugal terms. Such a system is quasi-maximally superintegrable since this is endowed with 2N-3 functionally independent constants of the motion (plus the Hamiltonian). Secondly, we identify two maximally superintegrable Hamiltonians by choosing a specific central potential and finding at the same time the remaining integral. The former is the generalization of the Smorodinsky-Winternitz system to the above six spaces, while the latter is a generalization of the Kepler-Coulomb potential, for which the Laplace-Runge-Lenz N-vector is also given. All the systems and constants of the motion are explicitly expressed in a unified form in terms of ambient and polar coordinates as they are parametrized by two contraction parameters (curvature and signature of the metric).
description: 14 pages. Based on the contribution presented at the "XII International Conference on Symmetry Methods in Physics", Yerevan (Armenia), July 2006. To appear in Physics of Atomic Nuclei
Different vacua in 2HDM
Creators: name: Ginzburg, I. F.
name: Kanishev, K. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the extrema of the Two Higgs Doublet Model with different physical properties. We have found necessary and sufficient conditions for realization of the extrema with different properties as the vacuum state of the model. We found explicit equations for extremum energies via parameters of potential if it has explicitly CP conserving form. These equations allow to pick out extremum with lower energy -- vacuum state and to look for change of extrema (phase transitions) with the variation of parameters of potential. Our goal is to find general picture here to apply it for description of early Universe.
description: 24 pages, 3 figures
Sampling Polynomial Trajectories for LTL Verification
Creators: name: Selvaratnam, Daniel
name: Cantoni, Michael
name: Davoren, J. M.
name: Shames, Iman
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Formal Languages and Automata Theory (cs.FL)
subject: FOS: Computer and information sciences
subject: F.4.1; F.3.1

description: This paper concerns the verification of continuous-time polynomial spline trajectories against linear temporal logic specifications (LTL without 'next'). Each atomic proposition is assumed to represent a state space region described by a multivariate polynomial inequality. The proposed approach samples a trajectory strategically, to capture every one of its region transitions. This yields a discrete word called a trace, which is amenable to established formal methods for path checking. The original continuous-time trajectory is shown to satisfy the specification if and only if its trace does. General topological conditions on the sample points are derived that ensure a trace is recorded for arbitrary continuous paths, given arbitrary region descriptions. Using techniques from computer algebra, a trace generation algorithm is developed to satisfy these conditions when the path and region boundaries are defined by polynomials. The proposed PolyTrace algorithm has polynomial complexity in the number of atomic propositions, and is guaranteed to produce a trace of any polynomial path. Its performance is demonstrated via numerical examples and a case study from robotics.
description: Published in Theoretical Computer Science. Definition 7 and Remark 4 have been updated to correct an oversight in the published version
Conformal paracontact curvature and the local flatness theorem
Creators: name: Ivanov, Stefan
name: Vassilev, Dimiter
name: Zamkovoy, Simeon
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: A curvature-type tensor invariant called para contact (pc) conformal curvature is defined on a paracontact manifold. It is shown that a paracontact manifold is locally paracontact conformal to the hyperbolic Heisenberg group or to a hyperquadric of neutral signature if and only if the pc conformal curvature vanishes. In the three dimensional case the corresponding result is achieved through employing a certain symmetric (0,2) tensor. The well known result of Cartan-Chern-Moser giving necessary and sufficient condition a CR-structure to be CR equivalent to a hyperquadric in the complex vector space is presented in-line with the paracontact case. An explicit formula for the regular part of a solution to the sub-ultrahyperbolic Yamabe equation on the hyperbolic Heisenberg group is shown.
description: 18 pages, substantial clarification of the integrability condition in dimension 3 in both CR and para CR cases, CR-part shortened
Realistic simulations of spin squeezing and cooperative coupling effects in large ensembles of interacting two-level systems
Creators: name: Huber, Julian
name: Rey, Ana Maria
name: Rabl, Peter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We describe an efficient numerical method for simulating the dynamics of interacting spin ensembles in the presence of dephasing and decay. The method builds on the discrete truncated Wigner approximation for isolated systems, which combines the mean-field dynamics of a spin ensemble with a Monte Carlo sampling of discrete initial spin values to account for quantum correlations. Here we show how this approach can be generalized for dissipative spin systems by replacing the deterministic mean-field evolution by a stochastic process, which describes the decay of coherences and populations while preserving the length of each spin. We demonstrate the application of this technique for simulating nonclassical spin-squeezing effects or the dynamics and steady states of cavity QED models with hundred thousand interacting two-level systems and without relying on any symmetries. This opens up the possibility to perform accurate real-scale simulations of a diverse range of experiments in quantum optics or with solid-state spin ensembles under realistic laboratory conditions.
description: 15 pages , 9 figures
Additional file 1 of Effects of UBE3A on the insulin resistance in polycystic ovary syndrome through the ubiquitination of AMPK
Creators: name: Ma, Ning
name: Zhou, Jing
name: Zhou, Zhi
name: Wan, Bangbei
name: Lu, Weiying
Publisher: name: figshare
Year: 2023
Subjects: subject: Biochemistry
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Cancer

description: Supplementary Material 1
Spin geometry of entangled qubits under bilocal decoherence modes
Creators: name: Durstberger, Katharina
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Lindblad generators of the master equation define which kind of decoherence happens in an open quantum system. We are working with a two qubit system and choose the generators to be projection operators on the eigenstates of the system and unitary bilocal rotations of them. The resulting decoherence modes are studied in detail. Besides the general solutions we investigate the special case of maximally entangled states - the Bell singlet states. The results are depicted in the so-called spin geometry picture which allows to illustrate the evolution of the (nonlocal) correlations stored in a certain state. The question for which conditions the path traced out in the geometric picture depends only on the relative angle between the bilocal rotations is addressed.
description: 12 pages, 3 figures