cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Defect of characters of the symmetric group
Creators: name: Gramain, Jean-Baptiste
Publisher: name: arXiv
Year: 2009
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 20C30

description: Following the work of B. Kuelshammer, J. B. Olsson and G. R. Robinson on generalized blocks of the symmetric groups, we give a definition for the \ell-defect of characters of the symmetric group S_n, where \ell > 1 is an arbitrary integer. We prove that the \ell -defect is given by an analogue of the hook-length formula, and use it to prove, when n < \ell^2, an \ell-version of the McKay Conjecture in S_n .
description: To appear in Journal of Group Theory, 10 pages
Supplemental information from Fission yeast Wee1 is required for stable kinetochore-microtubule attachment
Creators: name: Takado, Masahiro
name: Yamamoto, Takaharu G.
name: Chikashige, Yuji
name: Matsumoto, Tomohiro
Publisher: name: The Royal Society
Year: 2023
Subjects: classificationCode: 310199
subject: Biochemistry and cell biology not elsewhere classified
classificationCode: 3105
subject: Genetics
subject: FOS: Biological sciences

description: Wee1 is a cell cycle regulator that phosphorylates Cdk1/Cdc2 and inhibits G2/M transition. Loss of Wee1 in fission yeast results in an early onset of mitosis. Interestingly, we found that cells lacking Wee1 require the functional spindle checkpoint for their viability. Genetic analysis indicated that the requirement is not attributable to the early onset of mitosis. Live-cell imaging revealed that some kinetochores are not attached or bioriented in the wee1 mutant. Furthermore, Mad2, a component of the spindle checkpoint known to recognize unattached kinetochores, accumulates in the vicinity of the spindle, representing activation of the spindle checkpoint in the mutant. It appears that the wee1 mutant cannot maintain stable kinetochore-microtubule attachment, and relies on the delay imposed by the spindle checkpoint for establishing biorientation of kinetochores. This study revealed a role of Wee1 in ensuring accurate segregation of chromosomes during mitosis, and thus provided a basis for a new principle of cancer treatment with Wee1 inhibitors.
Contact graphs of disk packings as a model of spatial planar networks
Creators: name: Zhang, Zhongzhi
name: Guan, Jihong
name: Ding, Bailu
name: Chen, Lichao
name: Zhou, Shuigeng
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Spatially constrained planar networks are frequently encountered in real-life systems. In this paper, based on a space-filling disk packing we propose a minimal model for spatial maximal planar networks, which is similar to but different from the model for Apollonian networks [J. S. Andrade, Jr. et al., Phys. Rev. Lett. {\bf 94}, 018702 (2005)]. We present an exhaustive analysis of various properties of our model, and obtain the analytic solutions for most of the features, including degree distribution, clustering coefficient, average path length, and degree correlations. The model recovers some striking generic characteristics observed in most real networks. To address the robustness of the relevant network properties, we compare the structural features between the investigated network and the Apollonian networks. We show that topological properties of the two networks are encoded in the way of disk packing. We argue that spatial constrains of nodes are relevant to the structure of the networks.
description: 12 pages, 7 figures. Definitive version accepted for publication in New Journal of Physics
Policy Cloud D5.4 CROSS-SECTOR POLICY LIFECYCLE MANAGEMENT: DESIGN & OPEN SPECIFICATION 2
Creators: name: Duzha, Armend
name: Maglogiannis, Ilias
name: Moutselos, Kostas
name: Garcia, Luis Miguel
name: Gallego, Jesús Manuel
name: Nasias, Kostas
name: Maragkos, Chris
name: Pontual, Ana Luiza
name: Milà, Miquel
name: Sancho, Javier
name: del Hoyo, Rafael
name: Yovkova, Iskra
name: Bettiol, Alberto
name: Taborda Barata, Martim
Publisher: name: Zenodo
Year: 2021
Subjects: Policy Cloud
CROSS-SECTOR
POLICY LIFECYCLE MANAGEMENT
Design and Open Specification
policymaking

description: This document is an incremental update of deliverable D5.2 [1] and details the specification of the tools and technologies used to model Public Policies (PPs) as well as the design of the policy development toolkit (including the visualization framework), and the mechanisms required for compilation of policy collections to perform cross-sector analysis. The purpose of this series of deliverables is to keep track of the specifications throughout the project and update them as the project progresses. This deliverable has been released in M20 (August 2021) of the project, and its main objective is to describe the approach to the policy modelling and validation that will support policy makers in the design, evaluation, optimization and adaptation of policies. The Policy Development Toolkit (PDT), along with the Policy Model Editor (PME), constitute the front-end of the PolicyCLOUD platform, which allows policy makers to create, update and validate policies. The PDT backend, which hides the complexity of storing the data models into persistent storage, implements the services that the front-end uses to display the content to the user and provide the necessary user experience.
description: This deliverable is submitted to the EC, not yet approved.
description: {"references": ["PolicyCLOUD. D5.2 \"Cross-sector Policy Lifecycle Management Design and Open Specification 1\". Armend Duzha et al. 2020.", "Gagnon, M. L., Labont\u00e9, R. (2010) \"Framing Health and Foreign Policy: Lessons for Global Health Diplomacy\", Globalization and Health, Vol. 6 (14). https://doi.org/10.1186/1744-8603-6-14", "Patton, C.V., and Sawicki, D.S., (1993) \"Basic Methods of Policy Analysis and Planning\", Vol. 7. Prentice Hall Englewood Cliffs, NJ.", "Scharpf, F.W., (1997) \"Games Real Actors Play: Actor-centered Institutionalism in Policy Research\". Westview Press.", "Moutselos, K., Kyriazis, D., Diamantopoulou, V., Maglogiannis, I., (2018) \"Trustworthy Data Processing for Health Analytics Tasks\", IEEE International Conference on Big Data, p. 3774-9.", "Angular, https://angular.io", "Angular Material, https://material.angular.io/", "AM charts, https://www.amcharts.com/", "Java 8, https://docs.oracle.com/javase/8/docs/technotes/guides/language/index.html", "JSR-331, https://jcp.org/en/jsr/detail?id=311", "JSR-339, https://jcp.org/en/jsr/detail?id=339", "JSR-370, https://jcp.org/en/jsr/detail?id=370", "Jersey, https://eclipse-ee4j.github.io/jersey/", "PolicyCLOUD. D3.3 \"PolicyCLOUD Societal and Ethical Requirements and Guidelines\". Alice Audino at al. 2020."]}
On external presentations of infinite graphs
Creators: name: Morvan, Christophe
Publisher: name: arXiv
Year: 2009
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: Discrete Mathematics (cs.DM)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.4.3; F.4.1

description: The vertices of a finite state system are usually a subset of the natural numbers. Most algorithms relative to these systems only use this fact to select vertices. For infinite state systems, however, the situation is different: in particular, for such systems having a finite description, each state of the system is a configuration of some machine. Then most algorithmic approaches rely on the structure of these configurations. Such characterisations are said internal. In order to apply algorithms detecting a structural property (like identifying connected components) one may have first to transform the system in order to fit the description needed for the algorithm. The problem of internal characterisation is that it hides structural properties, and each solution becomes ad hoc relatively to the form of the configurations. On the contrary, external characterisations avoid explicit naming of the vertices. Such characterisation are mostly defined via graph transformations. In this paper we present two kind of external characterisations: deterministic graph rewriting, which in turn characterise regular graphs, deterministic context-free languages, and rational graphs. Inverse substitution from a generator (like the complete binary tree) provides characterisation for prefix-recognizable graphs, the Caucal Hierarchy and rational graphs. We illustrate how these characterisation provide an efficient tool for the representation of infinite state systems.
Multi-qubit compensation sequences
Creators: name: Tomita, Yu
name: Merrill, J. True
name: Brown, Kenneth R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The Hamiltonian control of n qubits requires precision control of both the strength and timing of interactions. Compensation pulses relax the precision requirements by reducing unknown but systematic errors. Using composite pulse techniques designed for single qubits, we show that systematic errors for n qubit systems can be corrected to arbitrary accuracy given either two non-commuting control Hamiltonians with identical systematic errors or one error-free control Hamiltonian. We also examine composite pulses in the context of quantum computers controlled by two-qubit interactions. For quantum computers based on the XY interaction, single-qubit composite pulse sequences naturally correct systematic errors. For quantum computers based on the Heisenberg or exchange interaction, the composite pulse sequences reduce the logical single-qubit gate errors but increase the errors for logical two-qubit gates.
description: 9 pages, 5 figures; corrected reference formatting
Quantum Spin Tomography in Ferromagnet-Normal Conductors
Creators: name: Samuelsson, P.
name: Brataas, Arne
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present a theory for a complete reconstruction of non-local spin correlations in ferromagnet-normal conductors. This quantum spin tomography is based on cross correlation measurements of electric currents into ferromagnetic terminals with controllable magnetization directions. For normal injectors, non-local spin correlations are universal and strong. The correlations are suppressed by spin-flip scattering and, for ferromagnetic injectors, by increasing injector polarization.
description: 4+ pages
Teraflop per second gravitational lensing ray-shooting using graphics processing units
Creators: name: Thompson, Alexander C.
name: Fluke, Christopher J.
name: Barnes, David G.
name: Barsdell, Benjamin R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Gravitational lensing calculation using a direct inverse ray-shooting approach is a computationally expensive way to determine magnification maps, caustic patterns, and light-curves (e.g. as a function of source profile and size). However, as an easily parallelisable calculation, gravitational ray-shooting can be accelerated using programmable graphics processing units (GPUs). We present our implementation of inverse ray-shooting for the NVIDIA G80 generation of graphics processors using the NVIDIA Compute Unified Device Architecture (CUDA) software development kit. We also extend our code to multiple-GPU systems, including a 4-GPU NVIDIA S1070 Tesla unit. We achieve sustained processing performance of 182 Gflop/s on a single GPU, and 1.28 Tflop/s using the Tesla unit. We demonstrate that billion-lens microlensing simulations can be run on a single computer with a Tesla unit in timescales of order a day without the use of a hierarchical tree code.
description: 21 pages, 4 figures, submitted to New Astronomy
Additional file 1 of Effects of regional cerebral oxygen saturation monitoring on postoperative cognitive dysfunction in older patients: a systematic review and meta-analysis
Creators: name: Ding, Xiahao
name: Zha, Tianming
name: Abudurousuli, Gulibositan
name: Zhao, Cuimei
name: Chen, Zixuan
name: Zhang, Yang
name: Gui, Bo
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Immunology
subject: FOS: Clinical medicine
subject: Marine Biology
subject: Cancer
subject: Science Policy

description: Supplementary Material 1
La Open Science como sustento a la cooperación internacional en investigación educativa
Creators: name: García-Peñalvo, F. J.
Publisher: name: Zenodo
Year: 2021
Subjects: Ciencia Abierta, Educación Abierta, Cooperación Internacional, Conocimiento Abierto, W-STEM, OpenGame

description: Participación en la mesa Cooperación internacional en investigaciones educativas, organizada el 4 de noviembre de 2021 en la Conferencia Internacional de Investigación en Educación (IRED 2021), celebrada en el Instituto Universitario de Ciencias de la Educación de la Universidad de Salamanca. La Ciencia Abierta u Open Science es la base sobre la que construir las relaciones de colaboración entre investigadores internacionales para el desarrollo de proyectos de investigación educativa. Los principios de la Ciencia Abierta enlazan con la recomendación de la UNESCO sobre los Recursos Educativos Abiertos (REA) “Promoción y fortalecimiento de la cooperación internacional” y sus postulados sobre Open Science, además de ser congruentes con los 17 ODS de las Naciones Unidas.
The Baryonic Acoustic Feature and Large-Scale Clustering in the SDSS LRG Sample
Creators: name: Kazin, Eyal A.
name: Blanton, Michael R.
name: Scoccimarro, Roman
name: McBride, Cameron K.
name: Berlind, Andreas A.
name: Bahcall, Neta A.
name: Brinkmann, Jon
name: Czarapata, Paul
name: Frieman, Joshua A.
name: Kent, Stephan M.
name: Schneider, Donald P.
name: Szalay, Alexander S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We examine the correlation function ξof the Sloan Digital Sky Survey (SDSS) Luminous Red Galaxy sample (LRG) at large scales (60
description: Main text- 19 pages (single column), Abstract- 6 pages, Figures- 19 pages. Submitted to ApJ. Double column version, DATA used and RESULTS may be accessed at: http://cosmo.nyu.edu/~eak306/kazin09a.html
GRS 1915+105 : High-energy Insights with SPI/INTEGRAL
Creators: name: Droulans, Robert
name: Jourdain, Elisabeth
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on results of two years of INTEGRAL/SPI monitoring of the Galactic microquasar GRS 1915+105. From September 2004 to May 2006, the source has been observed twenty times with long (approx 100 ks) exposures. We present an analysis of the SPI data and focus on the description of the high-energy (> 20 keV) output of the source. We found that the 20 - 500 keV spectral emission of GRS 1915+105 was bound between two states. It seems that these high-energy states are not correlated with the temporal behavior of the source, suggesting that there is no direct link between the macroscopic characteristics of the coronal plasma and the the variability of the accretion flow. All spectra are well fitted by a thermal comptonization component plus an extra high-energy powerlaw. This confirms the presence of thermal and non-thermal electrons around the black hole.
description: 7 pages, 8 figures, 2 tables; accepted (09/11/2008) for publication in A&A
Three-dimensional "Mercedes-Benz" model for water
Creators: name: Dias, Cristiano L.
name: Ala-Nissila, Tapio
name: Grant, Martin
name: Karttunen, Mikko
Publisher: name: arXiv
Year: 2009
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In this paper we introduce a three-dimensional version of the Mercedes-Benz model to describe water molecules. In this model van der Waals interactions and hydrogen bonds are given explicitly through a Lennard-Jones potential and a Gaussian orientation-dependent terms, respectively. At low temperature the model freezes forming Ice-I and it reproduces the main peaks of the experimental radial distribution function of water. In addition to these structural properties, the model also captures the thermodynamical anomalies of water: the anomalous density profile, the negative thermal expansivity, the large heat capacity and the minimum in the isothermal compressibility.
On the numerical treatment of interlaced target values: modeling, optimization and simulation of regulating valves in gas networks
Creators: name: Hennings, Felix
name: Petkovic, Milena
name: Streubel, Tom
Publisher: name: Springer Science and Business Media LLC
Year: 2023
Subjects: subject: 500 Naturwissenschaften und Mathematik::510 Mathematik::510 Mathematik
subject: transient gas network control
subject: set-point value control
subject: dynamic simulation
subject: mixed-integer optimization
subject: industry ready
subject: modeling self-adjusting active elements

description: Due to the current and foreseeable shifts towards carbon dioxide neutral energy production, which will likely result in balancing fluctuating renewable energy generation by transforming power-to-gas-to-power as well as building a large-scale hydrogen transport infrastructure, the trading and transport operations of gas will become more dynamic, volatile, and hence also less predictable. Therefore, computer-aided support in terms of rapid simulation and control optimization will further broaden its importance for gas network dispatching. In this paper, we aim to contribute and openly publish two new mathematical models for regulators, also referred to as control valves, which together with compressors make up the most complex and involved types of active elements in gas network infrastructures. They provide direct control over gas networks but are in turn controlled via target values, also known as set-point values, themselves. Our models incorporate up to six dynamical target values to define desired transient states for the elements’ local vicinity within the network. That is, each pair of every two target values defines a bounding box for the inlet pressure, outlet pressure as well as the passing mass flow of gas. In the proposed models, those target values are prioritized differently and are constantly in competition with each other, which can only be resolved dynamically at run-time of either a simulation or optimization process. Besides careful derivation, we compare simulation and optimization results with predictions of the widely adopted commercial simulation tool SIMONE, serving as our substitute for actual real-world transport operations.
Moduli Spaces in Algebraic Geometry
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: The workshop on Moduli Spaces in Algebraic Geometry aimed to bring together researchers from all branches of moduli theory, in order to discuss moduli spaces from different points of view, and to give an overview of methods used in their respective fields. Highlights included a complete proof of Göttsche’s conjecture, a proof of rationality of a moduli space constructed via GIT quotient using reduction modulo p, and a proof of a conjecture of Looijenga using the ideas of mirror symmetry.
Annihilation of the electron-positron pairs in the positronium ion Ps$^-$ and bi-positronium Ps$_2$
Creators: name: Frolov, Alexei M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Rates of the two-, three-, four- and five-photon annihilations of the electron-positron pairs are determined numerically for the three-body positronium ion Ps$^-$ ($e^- e^+ e^-$) and four-body bi-positronium `molecule' Ps$_2$ ($e^- e^+ e^- e^+$). The values obtained in our computations are $Γ_{2 γ}($Ps$^-) \approx$ 2.08048530525$\cdot 10^{9}$ $sec^{-1}$, $Γ_{3 γ}($Ps$^-) \approx$ 5.6364151550$\cdot 10^{6}$ $sec^{-1}$, $Γ_{4 γ}($Ps$^-) \approx$ 3.075$\cdot 10^{3}$ $sec^{-1}$, $Γ_{5 γ}($Ps$^-) \approx 5.383$ $sec^{-1}$ and $Γ_{2 γ}($Ps$_2) \approx$ 4.4385952$\cdot 10^{9}$ $sec^{-1}$, $Γ_{3 γ}($Ps$_2) \approx$ 1.202497$ \cdot 10^7$ $sec^{-1}$, $Γ_{4 γ}($Ps$_2) \approx$ 6.562$\cdot 10^3$ $sec^{-1}$, $Γ_{5 γ}($Ps$_2) \approx$ 11.484 $sec^{-1}$. The four- and five-photon annihilation rates are significantly smaller than the corresponding two- and three-photon annihilation rates known for these systems. We also determine the rates of one- and zero-photon annihilation for the Ps$^{-}$ ion and Ps$_2$ system. The corresponding numerical values are $Γ_{1 γ}($Ps$^-) \approx$ 3.82491$\cdot 10^{-2}$ $sec^{-1}$, $Γ_{1 γ}($Ps$_2) \approx$ 1.94188$\cdot 10^{-1}$ $sec^{-1}$ and $Γ_{0 γ}($Ps$_2) \approx$ 2.32197$\cdot 10^{-9}$ $sec^{-1}$. Pusblished almost `as is' in Phys. Rev. A {\bf 80}, 014502 (2009).
description: 10 pages
Indications for a line of continuous phase transitions at finite temperatures connected with the apparent metal-insulator transition in 2d disordered systems
Creators: name: Mobius, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: In a recent experiment, Lai et al. [Phys. Rev. B 75 (2007) 033314] studied the apparent metal-insulator transition (MIT) of a Si quantum well structure. Tuning the charge carrier concentration n, they measured the conductivity sigma(T,n) for a very dense set of n values. They observed linear T dependences of sigma around the Fermi temperature and found that the corresponding T -> 0 extrapolation sigma_0(n) exhibits a sharp bend just at the MIT. Reconsidering the data by Lai et al., it is shown here that this sharp bend is related to a peculiarity of sigma(T=const.,n), which is clearly detectable in the whole T range up to 4 K, the highest measuring temperature in that work. It may indicate a sharp continuous phase transition between the regions of apparent metallic and activated conduction to be present at finite temperature. This interpretation is confirmed by a scaling analysis without fit, which illuminates similarities to previous experiments and provides understanding of the shape of the peculiarity and of sharp peaks found in dlog_{10}sigma/dn(n). Simultaneously, the scaling analysis uncovers a strange feature of the apparent metallic state.
description: 4 pages, 4 figures, accepted for Proceedings EP2DS-18 in Physica E; substantially extends detailed arguments presented in arXiv:0712.0992
Non-positive Curvature and Geometric Structures in Group Theory
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: The focus of this meeting was the use of geometric methods to study infinite discrete groups. Key topics included isometric actions of such groups on spaces of nonpositive curvature, such as CAT(0) cube complexes, buildings, and hyperbolic or symmetric spaces. These actions lead to a rich and fruitful interplay between geometry and group theoretic questions.
Some flows in shape optimization
Creators: name: Cardaliaguet, Pierre
name: Ley, Olivier
Publisher: name: arXiv
Year: 2010
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: Geometric flows related to shape optimization problems of Bernoulli type are investigated. The evolution law is the sum of a curvature term and a nonlocal term of Hele-Shaw type. We introduce generalized set solutions, the definition of which is widely inspired by viscosity solutions. The main result is an inclusion preservation principle for generalized solutions. As a consequence, we obtain existence, uniqueness and stability of solutions. Asymptotic behavior for the flow is discussed: we prove that the solutions converge to a generalized Bernoulli exterior free boundary problem.
Homogeneous Dynamics and Number Theory
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: The theory of flows on homogeneous spaces of Lie groups has emerged as a distinct, rapidly advancing subject over the last few decades incorporating ergodic theory, geometry and number theory. The workshop showcased the latest advances in the subject as well as a wide range of applications.
Mini-Workshop: History of Mathematics in Germany, 1920 - 1960
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: The Mini-Workshop dealt with the history of mathematics in Germany between 1920 and 1960, with a particular focus on the social history of mathematics. For the period under discussion research in the history of mathematics is faced with some fundamental problems, which cannot be addressed by individuals. Consequently the Mini-Workshop’s aim was to develop future perspectives and methods for research and ways to organise new research projects. Among the topics addressed during the Mini-Workshop were the international relations of mathematicians in Germany before, during and after World War II; the prosopography of mathematicians in Germany from before 1933 into the 1950s; the role of mathematics as a key technology in World War II; and the professional policies from the 1920s to the 1950s.
Geometric Group Theory, Hyperbolic Dynamics and Symplectic Geometry
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: The main theme of the workshop is the interaction between the speedily developing fields of mathematics mentioned in the title. One of the purposes of the workshop is to highlight new exciting developments which are happening right now on the borderline between hyperbolic dynamics, geometric group theory and symplectic geometry.
Phase Transition in Simplest Plasma Models
Creators: name: Iosilevski, I. L.
name: Chigvintsev, A. Yu.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Previous study of properties of the first-order phase transition in a set of plasma mod-els with common feature - absence of individual correlations between charges of opposite sign, was continued. Predicted discontinuities in equilibrium non-uniform charge profiles have been calculated for the case of electron distribution in atomic cell and some other similar situations. These anomalies appear when some simple approximations are used and they may be naturally interpreted in terms of discussed phase transition.
description: 4 pages, 1 table, 3 figures
Rheological properties for inelastic Maxwell mixtures under shear flow
Creators: name: Garzo, Vicente
name: Trizac, Emmanuel
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The Boltzmann equation for inelastic Maxwell models is considered to determine the rheological properties in a granular binary mixture in the simple shear flow state. The transport coefficients (shear viscosity and viscometric functions) are {\em exactly} evaluated in terms of the coefficients of restitution, the (reduced) shear rate and the parameters of the mixture (particle masses, diameters and concentration). The results show that in general, for a given value of the coefficients of restitution, the above transport properties decrease with increasing shear rate.
Calculus of Variations
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: Since its invention by Newton, the calculus of variations has formed one of the central techniques for studying problems in geometry, physics, and partial differential equations. This trend continues even today. On the one hand, slow but steady progress is made on long-standing questions concerning minimal surfaces, curvature flows, and related geometric objects. Basic questions also remain in such areas as mathematical physics and general relativity. On the other hand, new types of question emerge, driven by applications from economics and engineering to materials science, whose solution will depend on developing ideas and techniques in this classical branch of analysis. The July 2010 Oberwolfach workshop on the Calculus of Variations showcased a blend of continued progress in traditional areas with surprising developments which emerged from the exploration of new lines of research.
A study of the art attitudes of Art 91 students in British Columbia's high schools, 1961-1962.
Creators: name: Pohl, Lorraine Adina
Publisher: name: University of British Columbia
Year: 2011

description: This is a study carried out in British Columbia in the spring of 1962. The information was gathered with the use of a questionnaire which was administered to 606 students enrolled in the course Art 91. The questionnaire asked for information which the researcher used as the basis for discovering the attitudes of the students. A person's behaviour was considered to be a valid indication of his attitude and so the four chapters which comprise the bulk of the paper deal with each of four behaviour expressions: reading, activities, personal earnestness and realism and artistic experience and the desire to communicate it. The questions whose answers revealed the student's attitudes in each of the categories were tabulated, compared with answers to other questions and discussed. Smaller groups of students within the Art 91 group were then taken apart from the rest and their scores on the questionnaire were compared with the Art 91 average. In the comparison between art club members and the larger group, it was found that there was a more positive attitude response to all the questions but one, which were compared. While more art club members kept a sketchbook, attended the lecture of a guest artist, and gave more 'original' answers to the subjective questions; it was found that art club members had experienced the use of fewer art media than the average for Art 91 students. Although the scores of art club members did seem better than those for the average among Art 91 students, it was decided that the difference was not great enough. A comparison of the academic achievement for art club members showed that the proportion of academic 'A' and 'B' students was far higher and that of academic 'D' and 'E' students much lower than those found in the Art 91 group as a whole. Three other groups of papers were then taken apart from the rest. In the question asking how students felt art would be useful to them after graduation, the students whose answers indicated that they planned an art career formed one sub-group. Those whose answers showed that they felt art would be useful to them in a non-art profession formed the second and those who felt that art would be of no use after graduation formed the third. It was found when comparing the answers of these students to both the subjective and the objective questions that group one scored consistently much higher than average, that group two scored slightly above average and that group three scored exceedingly low. When the academic achievements of these students were compared to the average for Art 91 students, it was found that there was no definite pattern but the students answering that art would be no use to them did show a slightly higher percentage of low academic achievers than did the Art 91 group as a whole.
Coherent shift of localized bound pair in Bose Hubbard model
Creators: name: Jin, L.
name: Chen, B.
name: Song, Z.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Based on the exact results obtained by Bethe ansatz, we demonstrate the existence of stable bound pair (BP) wave packet in Bose Hubbard model with arbitrary on-site interaction U. In large-U regime, it is found that an incoming single-particle (SP) can coherently pass through a BP wave packet and leave a coherent shift in the position of it. This suggests a simple scheme for constructing a BP charge qubit to realize a quantum switch, which is capable of controlling the coherent transport of one and only one photon in a one-dimensional waveguide.
description: 5 pages, 3 figures
Cohomology of Finite Groups: Interactions and Applications
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: The cohomology of finite groups is an important tool in many subjects including representation theory and algebraic topology. This meeting was the third in a series that has emphasized the interactions of group cohomology with other areas.
Wavelet and Multiscale Methods
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: Various scientific models demand finer and finer resolutions of relevant features. Paradoxically, increasing computational power serves to even heighten this demand. Namely, the wealth of available data itself becomes a major obstruction. Extracting essential information from complex structures and developing rigorous models to quantify the quality of information leads to tasks that are not tractable by standard numerical techniques. The last decade has seen the emergence of several new computational methodologies to address this situation. Their common features are the nonlinearity of the solution methods as well as the ability of separating solution characteristics living on different length scales. Perhaps the most prominent examples lie in multigrid methods and adaptive grid solvers. These have advanced the frontiers of computability for certain problem classes in numerical analysis. Other highly visible examples are: regression techniques in nonparametric statistical estimation, the design of universal estimators in the context of mathematical learning theory and machine learning; the investigation of greedy algorithms in complexity theory, compression techniques and encoding in signal and image processing; the solution of global operator equations through the compression of fully populated matrices arising from boundary integral equations with the aid of multipole expansions and hierarchical matrices; attacking problems in high spatial dimensions by sparse grid or hyperbolic wavelet concepts. This workshop proposed to deepen the understanding of the underlying mathematical concepts that drive this new evolution of computation and to promote the exchange of ideas emerging in various disciplines. A special emphasis was placed on high dimensional problems since these amplify even further the need for novel theory and computation.
Low-Dimensional Topology and Number Theory
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: The workshop on Low-Dimensional Topology and Number Theory brought together researchers in these areas with the intent of exploring the many tantalizing connections between Low-Dimensional Topology and Number Theory. Some of the most actively discussed topics were the appearances of modularity in quantum invariants and mutual relations between hyperbolic volume, K-theory, and asymptotics of quantum invariants.
Implementation of an AI-based Tool to Assess Student Engagement with Society: Lesson Learnt Report
Creators: name: MCAST
Publisher: name: Zenodo
Year: 2023

description: As part of the Qual-AI-ty project, a piloting exercise was conducted with a selected number of students to test the effectiveness and user experience of the chatbot developed in IO4. Piloting is the best methodology to test and validate new and disruptive ideas under real-time operating conditions. The aim of the Qual-AI-ty Engagement Pilot was to assess the feasibility, time, cost and performance of the project. The pilot serves to test the project’s concept utilizing sparse resources to achieve results that would enable the detection of the main issues, gaps and risks in a cost-efficient manner. The main users, or target group, of the outcomes of the Qual-AI-ty project are quality assurance staff, as well as students and hence, the piloting was executed on a selected number of students in different Colleges and Universities for the Academic partners collaborating in this project. The pilot will have a high impact of the project as it will be the practical test of and will give significant insights to all IOs, which have been developed with application in mind, but without the actual real-life environment in which it shall operate.
Radio Spectral Index Analysis and Classes of Ejection in LS I +61 303
Creators: name: Massi
name: Kaufman-Bernado
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: LS I +61303 is a gamma-ray binary with periodic radio outbursts coincident with the orbital period of P=26.5 d. The origin of the radio emission is unclear,it could be due either to a jet, as in microquasars, or to the shock boundary between the Be star and a possible pulsar wind. We here analyze the radio spectral index over 6.7 yr from Green Bank Interferometer data at 2.2 GHz and 8.3 GHz. We find two new characteristics in the radio emission. The first characteristic is that the periodic outbursts indeed consist of two consecutive outbursts; the first outburst is optically thick, whereas the second outburst is optically thin. The spectrum of LS I +61 303 is well reproduced by the shock-in-jet model commonly used in the context of microquasars and AGNs: the optically thin spectrum is due to shocks caused by relativistic plasma ("transient jet") traveling through a pre-existing much slower steady flow ("steady jet"). This steady flow is responsible for the preceding optically thick spectrum. The second characteristic we find is that the observed spectral evolution, from optically thick to optically thin emission, occurs twice during the orbital period. We observed this occurrence at the orbital phase of the main 26.5 d outburst and also at an earlier phase, shifted by $ΔΦ\sim$ 0.3 (i.e almost 8 days before). We show that this result qualitatively and quantitatively agrees with the two-peak accretion/ejection model proposed in the past for LS I +61303. We conclude that the radio emission in LS I +61303 originates from a jet and suggest that the variable TeV emission comes from the usual Compton losses expected as an important by-product in the shock-in-jet theory.
description: 27 pages, 7 figures, accepted for publication in ApJ
Features of ion acoustic waves in collisional plasmas
Creators: name: Vranjes, J.
name: Poedts, S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The effects of friction on the ion acoustic (IA) wave in fully and partially ionized plasmas are studied. In a quasi-neutral electron-ion plasma the friction between the two species cancels out exactly and the wave propagates without any damping. If the Poisson equation is used instead of the quasi-neutrality, however, the IA wave is damped and the damping is dispersive. In a partially ionized plasma, the collisions with the neutrals modify the IA wave beyond recognition. For a low density of neutrals the mode is damped. Upon increasing the neutral density, the mode becomes first evanescent and then reappears for a still larger number of neutrals. A similar behavior is obtained by varying the mode wave-length. The explanation for this behavior is given. In an inhomogeneous plasma placed in an external magnetic field, and for magnetized electrons and un-magnetized ions, the IA mode propagates in any direction and in this case the collisions make it growing on the account of the energy stored in the density gradient. The growth rate is angle dependent. A comparison with the collision-less kinetic density gradient driven IA instability is also given.
description: The following article has been accepted by Physics of Plasmas. After it is published, it will be found at http://pop.aip.org/
Mini-Workshop: Mechanics of Cell Motion
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: This mini-workshop brought together established researchers and newer entrants in the field of cell motility, a challenging research area located at the crossroads of biology, mathematics and physics. Cell locomotion occurs through complex interactions that involve, among others, actin polymerization, matrix degradation, chemical signaling, adhesion and pulling on the substrate and fibers. In recent years the spatial resolution of experiments at a cellular and sub-cellular level have revealed a landscape of unexpected behaviors that demand for the application of physics and classical mathematical methods to reveal the principles that are at the basis of cell motion in terms of adhesion, directionality, internal engines. The focus of the mini-workshop was on the fundamental research in mathematical methods for biophysics of the cell, especially on the mathematical framework for the mechanics of the actin network, the encadrement of cellular traction as an inverse problem and the relation between cell-to-cell communication and morphogenesis.
Reservoir quality controls and reservoir modelling of continental to transitional shallow marine sedimentary basins of Southern Nigeria
Creators: name: Adamolekun, Olajide Jonathan
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2023
Subjects: Petrographie
Diagenese
Reservoirqualität
Reservoirmodellierung
Dahomey- und Niger-Delta-Becken
Petrography
diagenesis
reservoir quality
reservoir modelling
Dahomey and Niger Delta Basins

description: The object-based stochastic approach in facies modelling is important in the construction of geologically consistent 3-D reservoir models and in constraining the distribution of petrophysical properties. Tortuosity factor, facies, porosity and cementation factor constitute major uncertainties in the generated 3-D static model of the Niger Delta Basin. Reservoir quality in the Dahomey Basin is mainly controlled by detrital matrix, carbonate cement, and iron oxide and iron oxyhydroxide cements.
STUDY OF LOCAL ENVIRONMENT AROUND TUNGSTEN IN MIXED VALENCE BARIUM-TUNGSTEN-PHOSPHATE GLASSES BY X-RAY ABSORPTION SPECTROSCOPY
Creators: name: A. BALERNA
name: E. BERNIERI
name: E. BURATTINI
name: A. KUZMIN
name: J. PURANS
Publisher: name: INFN Open Access Repository
Year: 1991

description: The XANES and the EXAFS of the L_1- and L_3- edges of tungsten in BaO-P_2O_5-WO_3 glasses and amorphous thin films a-WO_3 were studied using Synchrotron radiation. The sets of distances were obtained in the first and the second coordination spheres of tungsten by a least square technique. It was found, that in all glasses tungsten atoms have strongly distorted oxygen octahedra, which are joined by vertices.
Mini-Workshop: Combinatorics on Words
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: The area of combinatorics on words is concerned with properties of sequences of symbols. It is characteristic to the field that questions arise from various mathematical problems, and hence, many fundamental results on words have been established in different areas. Over the last two decades the theory has developed into a quickly growing topic of its own. This work-shop was dedicated to reflect on the current status of the field, discuss the impact of recent results, and provide new research challenges. This is a report on the meeting and presentation of extended abstracts of the lectures.
Progress in Surface Theory
Creators: name: (:Unkn) Unknown
Publisher: name: Zürich : EMS Publ. House
Year: 2010
Subjects: subject: Konferenzschrift
subject: 510

description: The theory of surfaces is interpreted these days as a prototype of submanifold geometry and is characterized by the substantial application of PDE methods and methods from the theory of integrable systems, in addition to the more classical techniques from real and/or complex analysis. In addition, surfaces with singularities are studied intensively. In this workshop we brought together all the main strands of modern surface theory.
Asteroseismic analysis of the CoRoT δ-Scuti star HD174936
Creators: name: Hernández, A. García
name: Moya, A.
name: Michel, E.
name: Garrido, R.
name: Suárez, J. C.
name: Rodríguez, E.
name: Amado, P. J.
name: Martín-Ruíz, S.
name: Rolland, A.
name: Poretti, E.
name: Samadi, R.
name: Baglin, A.
name: Auvergne, M.
name: Catala, C.
name: Lefevre, L.
name: Baudin, F.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present an analysis of the δ-Scuti star object HD 174936 (ID 7613) observed by CoRoT during the first short run SRc01 (27 days). A total number of 422 frequencies we are extracted from the light curve using standard prewhitening techniques. This number of frequencies was obtained by considering a spectral significance limit of sig = 10 using the software package SigSpec. Our analysis of the oscillation frequency spectrum reveals a spacing periodicity of around 52 \muHz. Although modes considered here are not in the asymptotic regime, a comparison with stellar models confirms that this signature may stem from a quasi-periodic pattern similar to the so-called large separation in solar-like stars.
description: 7 pages, 7 figures, 2 tables. Accepted for publication in A&A CoRoT Special Feature