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PC Professionell 4/99 Cover CD

Topic: cover cd

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24

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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25

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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25

Sep 17, 2009
09/09

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NASA/Glenn Research Center

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58

Sep 23, 2013
09/13

by
L. Cornalba

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We discuss the physics of a single Dp-brane in the presence of a background electromagnetic field B_{ij}. It has recently been shown \cite{SW} that, in a specific \alpha ' \to 0 limit, the physics of the brane is correctly described by noncommutative Yang-Mills theory, where the noncommutative gauge potential is given explicitly in terms of the ordinary U(1) field. In a previous paper \cite{SC} the physics of a D2-brane was analyzed in the Sen-Seiberg limit of M(atrix) theory by considering a...

Source: http://arxiv.org/abs/hep-th/9909081v1

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Sep 23, 2013
09/13

by
K. Yamagishi; S. Kitahara; S. Ito; T. Tsunemi; S. Fujimoto; S. Kato; F. Shoji; T. Suzuki; H. Kodama; A. Nakamura

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Three topics concerning infrared effective lattice QCD are discussed. (1)Perfect lattice action of infrared SU(3) QCD and perfect operators for the static potential are analytically given when we assume two-point monopole interactions alone. The assumption seems to be justified from numerical analyses of pure SU(3) QCD in maximally abelian gauge. (2)Gauge invariance of monopole dominance can be proved theoretically if the gauge invariance of abelian dominance is proved. The gauge invariance of...

Source: http://arxiv.org/abs/hep-lat/9909104v1

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Sep 18, 2013
09/13

by
R. Folch; J. Casademunt; A. Hernandez-Machado; L. Ramirez-Piscina

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We implement a phase-field simulation of the dynamics of two fluids with arbitrary viscosity contrast in a rectangular Hele-Shaw cell. We demonstrate the use of this technique in different situations including the linear regime, the stationary Saffman-Taylor fingers and the multifinger competition dynamics, for different viscosity contrasts. The method is quantitatively tested against analytical predictions and other numerical results. A detailed analysis of convergence to the sharp interface...

Source: http://arxiv.org/abs/cond-mat/9903173v2

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Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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Sep 17, 2009
09/09

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NASA/Glenn Research Center

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Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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56

Sep 22, 2013
09/13

by
Fabio Gavarini

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Let $\hat{\frak g}$ be an untwisted affine Kac-Moody algebra. The quantum group $U_h(\hat{\frak g})$ (over $C[[h]]$) is known to be a quasitriangular Hopf algebra: in particular, it has a universal R-matrix, which yields an R-matrix for each pair of representations of $U_h(\hat{\frak g})$. On the other hand, the quantum group $U_q(\hat{\frak g})$ (over $C(q)) also has an R-matrix for each pair of representations, but it has not a universal R-matrix so that one cannot say that it is...

Source: http://arxiv.org/abs/math/9805009v3

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Sep 23, 2013
09/13

by
F. M. Lev; E. Pace; G. Salme`

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In front-form dynamics a current operator for systems of interacting particles, which fulfills Poincar\'e, parity and time reversal covariance, together with hermiticity, can be defined. The electromagnetic form factors can be extracted without any ambiguity and in the elastic case the continuity equation is automatically satisfied. Applications to the calculation of deuteron form factors are presented, and the effects of different nucleon-nucleon interactions, as well as of different nucleon...

Source: http://arxiv.org/abs/nucl-th/9909027v1

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Sep 23, 2013
09/13

by
S. J. Childs; F. A. Shillington

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Examples of heavy mineral placer deposits are presented in which wave reflection, refraction, diffraction and resonance would appear to have played a major concentrating role. Their geometry is compared with the computer generated patterns predicted for the reflection, refraction and diffraction of surface waves moving over fairly simple, idealised bathymetries. Much of this work is founded on the idea that similar sediments document equivalent (or once equivalent) flow-tractional environments....

Source: http://arxiv.org/abs/physics/9909023v1

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Sep 23, 2013
09/13

by
Alan Weinstein

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We define a C^1 distance between submanifolds of a riemannian manifold M and show that, if a compact submanifold N is not moved too much under the isometric action of a compact group G, there is a G-invariant submanifold C^1-close to N. The proof involves a procedure of averaging nearby submanifolds of riemannian manifolds in a symmetric way. The procedure combines averaging techniques of Cartan, Grove/Karcher, and de la Harpe/Karoubi with Whitney's idea of realizing submanifolds as zeros of...

Source: http://arxiv.org/abs/math/9908133v2

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Jul 20, 2013
07/13

by
Fabio Gavarini

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Let $\hat{\frak g}$ be an untwisted affine Kac-Moody algebra, with its Sklyanin-Drinfel'd structure of Lie bialgebra, and let $\hat{\frak h}$ be the dual Lie bialgebra. By dualizing the quantum double construction - via formal Hopf algebras - we construct a new quantum group $U_q(\hat{\frak h})$, dual of $U_q(\hat{\frak g})$. Studying its restricted and unrestricted integer forms and their specializations at roots of 1 (in particular, their classical limits), we prove that $U_q(\hat{\frak h})$...

Source: http://arxiv.org/abs/q-alg/9712013v2

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Sep 23, 2013
09/13

by
J. Bartels; M. G. Ryskin

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The nonsinglet spin dependent structure function $g_2(x,Q^2)$ is studied at small x within the double logarithmic approximation of perturbative QCD. Both positive and negative signature contributions are considered, and we find a power-like growth in $1/x$. We discuss how our result fits into the Wandzura-Wilczek relation.

Source: http://arxiv.org/abs/hep-ph/9909344v1

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Sep 23, 2013
09/13

by
Howard E. Haber; Heather E. Logan

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We explore the radiative corrections to the process $Z \to b \bar b$ in models with extended Higgs sectors. The observables $R_b = \Gamma(Z \to b \bar b)/\Gamma(Z \to \rm{hadrons})$ and the $Z b \bar b$ coupling asymmetry, $A_b = (g_L^2 - g_R^2)/(g_L^2 + g_R^2)$, are sensitive to these corrections. We present general formulae for the one-loop corrections to $R_b$ and $A_b$ in an arbitrary extended Higgs sector, and derive explicit results for a number of specific models. We find that in models...

Source: http://arxiv.org/abs/hep-ph/9909335v1

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Sep 23, 2013
09/13

by
V. V. Kiselev; A. I. Onishchenko

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The masses of baryons containing two heavy quarks and their couplings to the corresponding quark currents are evaluated in the framework of NRQCD sum rules. The coulomb-like corrections in the system of doubly heavy diquark are taken into account, and the contribution of nonperturbative terms coming from the quark, gluon and mixed condensates as well as the product of quark and gluon condensates, is analyzed. The higher condensates destroy the factorization of baryon and diquark correlators and...

Source: http://arxiv.org/abs/hep-ph/9909337v1

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Sep 23, 2013
09/13

by
A. Ringwald; F. Schrempp

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We review our on-going theoretical and phenomenological investigation of the prospects to discover QCD-instantons in deep-inelastic scattering at HERA.

Source: http://arxiv.org/abs/hep-ph/9909338v1

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Sep 18, 2013
09/13

by
R. Folch; J. Casademunt; A. Hernandez-Machado; L. Ramirez-Piscina

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We present a phase-field model for the dynamics of the interface between two inmiscible fluids with arbitrary viscosity contrast in a rectangular Hele-Shaw cell. With asymptotic matching techniques we check the model to yield the right Hele-Shaw equations in the sharp-interface limit and compute the corrections to these equations to first order in the interface thickness. We also compute the effect of such corrections on the linear dispersion relation of the planar interface. We discuss in...

Source: http://arxiv.org/abs/cond-mat/9903171v2

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Sep 23, 2013
09/13

by
M. Bergère

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We calculate the partition function for "composite particles". For any finite number of states d, and in the following two cases: 1)all states have the same energy, 2)the energy is linearly distributed over the states, we transform the partition function into a finite sum of terms which exhibit trivially their $% d $dependance. The infinite d thermodynamic limit is obtained as well as the finite d-size corrections, etc. In the second case, we obtain the finite d-size corrections to...

Source: http://arxiv.org/abs/cond-mat/9909179v1

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Sep 18, 2013
09/13

by
A. A. Pastor; V. Dobrosavljevic

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A model of spinless interacting electrons in presence of randomness is examined using an extended dynamical mean-field formulation. When the interaction strength is large as compared to the Fermi energy, a low temperature glassy phase is identified, which in our formulation corresponds to a replica-symmetry breaking instability. The glassy phase is characterized by a pseudo-gap in the single particle density of states, reminiscent of the Coulomb gap of Efros and Shklovskii. Due to ergodicity...

Source: http://arxiv.org/abs/cond-mat/9903272v2

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47

Sep 18, 2013
09/13

by
J. P. Zibin; Douglas Scott; Martin White

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We present limits on the fraction of large angle microwave anisotropies which could come from tensor perturbations. We use the COBE results as well as smaller scale CMB observations, measurements of galaxy correlations, abundances of galaxy clusters, and Lyman alpha absorption cloud statistics. Our aim is to provide conservative limits on the tensor-to-scalar ratio for standard inflationary models. For power-law inflation, for example, we find T/S 1.

Source: http://arxiv.org/abs/astro-ph/9901028v2

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44

Sep 23, 2013
09/13

by
The NA48 Collaboration; V. Fanti

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The NA48 experiment at CERN has performed a new measurement of direct CP violation, based on data taken in 1997 by simultaneously collecting K_L and K_S decays into pi0pi0 and pi+pi-. The result for the CP violating parameter Re(epsilon'/epsilon) is (18.5 +/- 4.5(stat)} +/- 5.8 (syst))x10^{-4}.

Source: http://arxiv.org/abs/hep-ex/9909022v1

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Sep 23, 2013
09/13

by
G. Feverati; F. Ravanini; G. Takacs

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We describe an extension of the nonlinear integral equation (NLIE) method to Virasoro minimal models perturbed by the relevant operator $\Phi_{(1,3)$. Along the way, we also complete our previous studies of the finite volume spectrum of sine-Gordon theory by considering the attractive regime and more specifically, breather states. For the minimal models, we examine the states with zero topological charge in detail, and give numerical comparison to TBA and TCS results. We think that the evidence...

Source: http://arxiv.org/abs/hep-th/9909031v2

6-A-223 Entrevista de Jaime Adrián Prieto Valladares a Julia Calindo, Josué David Gómez y Guillermina Muñóz (No. 6). 13 de septiembre 1999. Tiempo: 30:05.

Topics: entrevistas, anabautistas, iglesias, menonitas, latinoamérica

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21

Aug 6, 2018
08/18

by
Government of India

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The Gazette of India Date: 1999-9-13 Type: Extraordinary Part Number: Part II-Section 3-Sub-Section(ii) Reference Number: 760 E Department: Department of Revenue Ministry: Ministry of Finance Office: Office of the Commissioner of Customs Subject: In exercise of the powers conferred by Section 57 of Customs Act. 1962 (Act 52 of 1962)Whitefield Bangalore having been declared by the Central Board of Excise Customs, New Delhi vide CBEC Notification No 121 Cus. dated 9-5-81 as a Warehousing Station...

Topics: Gazette of India, Extraordinary Gazette of India

31-A-218 Entrevista de Jaime Adrián Prieto Valladares a Ismael Lira y María de Luz (No. 1). 13 de setiembre 1999. Tiempo: 59:56.

Topics: entrevistas, anabautistas, iglesias, menonitas, latinoamérica

Topics: msnbc.com, NBC, MSNBC, CNBC, NBC Today Show, NBC Nightly News, Dateline

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Jan 17, 2015
01/15

by
Mount Wilson Observatory

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This image includes data from the synoptic program at the 150-Foot Solar Tower of the Mt. Wilson Observatory. The Mt. Wilson 150-Foot Solar Tower is operated by UCLA, with funding from NASA, ONR and NSF, under agreement with the Mt. Wilson Institute.

Topics: solar, activity, sun, drawing, wilson

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24

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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SIGNING OF MEMORANDUM OF UNDERSTANDING BETWEEN NASA GLENN RESEARCH CENTER AND THE ARMY CORPS OF ENGINEERS

Topic: Where -- Glenn Research Center (GRC)

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Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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20

Sep 17, 2009
09/09

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NASA/Glenn Research Center

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43

Sep 23, 2013
09/13

by
D. Diakonov; M. Maul

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We introduce an explicit form of the multi-instanton weight including also instanton--anti-instanton interactions for arbitrary $N_c$ in the two-dimensional $CP^{N_c-1}$ model. To that end, we use the parametrization of multi-instantons in terms of instanton `constituents' which we call `zindons' for short. We study the statistical mechanics of zindons analytically (by means of the Debye-H\"uckel approximation) and numerically (running a Metropolis algorithm). Though the zindon...

Source: http://arxiv.org/abs/hep-th/9909078v1

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37

Oct 25, 2004
10/04

by
http://home.earthlink.net/~herbo/

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Alarming - A simple travel alarm application.

Topics: palm pilot, palm pilot software, palm pilot downloads, palm, palm os, downloads, palm downloads

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142

Dec 17, 2012
12/12

by
Patricia Wallace

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Topics: Impact of computing & IT on society, Popular psychology, Psychological aspects, Applied...

Source: removedNEL

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21

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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36

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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54

Sep 23, 2013
09/13

by
L. C. Garcia de Andrade

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A teleparallel geometrical description of the nematic phases of liquid crystals is proposed.In the case of the twisted geometry of nematics Cartan torsion is given by a spatial helical form which depends on the twist angle. Geodesics of a test particle around the teleparallel liquid crystal are given.

Source: http://arxiv.org/abs/cond-mat/9909178v1

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25

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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21

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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23

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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19

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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19

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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Electronic News 1999-09-13: Volume 45 , Issue 37. Digitized from IA1520614-03 . Previous issue: sim_electronic-news_1999-09-06_45_36 . Next issue: sim_electronic-news_1999-09-20_45_38 .

Topics: Engineering--Electrical Engineering, Trade Journals, microfilm

Source: IA1520614-03

This paper reports on a study of the impact of an integrated teacher education program for diversity on two beginning teachers and considers the challenges involved in investigating the impact of such programs. The study examined four elementary school teachers in their first or second year of teaching who were working in schools that served high percentages of racial minority and low-income students. Two of the teachers graduated from a master's teacher education program, Teaching in Urban...

Topics: ERIC Archive, Beliefs, Diversity (Student), Elementary Education, Elementary School Teachers,...

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47

Sep 23, 2013
09/13

by
Chinlin Guo; Herbert Levine; David Kessler

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Understanding the mechanism of protein secondary structure formation is an essential part of protein-folding puzzle. Here we describe a simple model for the formation of the $\beta$-hairpin, motivated by the fact that folding of a $\beta$-hairpin captures much of the basic physics of protein folding. We argue that the coupling of ``primary'' backbone stiffness and ``secondary'' contact formation (similar to the coupling between the ``secondary'' and ``tertiary'' structure in globular proteins),...

Source: http://arxiv.org/abs/cond-mat/9908108v2

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23

Sep 17, 2009
09/09

by
NASA/Glenn Research Center

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