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Sep 18, 2013
09/13

by
Charles Danforth; Ravi Sankrit; William Blair; Chris Howk; You-Hua Chu

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N66/NGC346 is the largest and brightest HII region in the Small Magellanic Cloud and contains at least one known supernova remnant SNR0057-7226. Optical emission from the remnant is overwhelmed by the bright photoionized emission from the nebula, but the remnant has been detected by way of far ultraviolet absorption lines. Here we present data from the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite showing strong OVI and CIII emission from a position at the edge of SNR0057-7226. We...

Source: http://arxiv.org/abs/astro-ph/0212354v1

At mid-twentieth century, the dominant framework for lesson design--the programmed instruction format--was derived from efforts to apply operant conditioning to human learning. Cognitive psychology soon offered an alternative view, represented by Robert Gagne's Events of Instruction, which became the dominant framework through the end of the twentieth century. More recent developments suggest that a new conceptual framework, offered by M. David Merrill, may provide an even more comprehensive...

Topics: ERIC Archive, Cognitive Processes, Cognitive Psychology, Educational Principles, Instructional...

The low-grazing-angle electromagnetic backscattering from small breaking water waves has been analyzed using computational electromagnetics (CEM) techniques. A new approach based on the multilevel fast multipole algorithm was implemented for 3-D surface crest scattering to supplement existing 2-D techniques. Multipath scattering between the wave crest and the front face can be modeled using physical optics on the face. A new method to model the specular reflection from jetting crests, termed...

Topics: DTIC Archive, West, James C, OKLAHOMA STATE UNIV STILLWATER, *COMPUTATIONS, *WATER WAVES, *WAKE,...

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Sep 18, 2013
09/13

by
Xiao-Yuan Li; Ernest Ma

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We propose a gauge model where quark-lepton universality is an accidental symmetry which is only approximate, in analogy to the well-accepted notion that strong isospin is accidental and approximate. This is a natural framework for explaining possible small deviations of quark-lepton universality which is applicable to the recently reported apparent nonunitarity of the quark mixing matrix. As a result, small departures from quark-lepton universality are expected in Z decays as well as in the...

Source: http://arxiv.org/abs/hep-ph/0212029v1

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Sep 18, 2013
09/13

by
E. Gamiz; M. Jamin; A. Pich; J. Prades; F. Schwab

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The mass of the strange quark is determined from SU(3)-breaking effects in the tau hadronic width. Compared to previous analyses, the contributions from scalar and pseudoscalar spectral functions, which suffer from large perturbative corrections, are replaced by phenomenological parametrisations. This leads to a sizeable reduction of the uncertainties in the strange mass from tau decays. Nevertheless, the resulting m_s value is still rather sensitive to the moment of the invariant mass...

Source: http://arxiv.org/abs/hep-ph/0212230v1

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Sep 18, 2013
09/13

by
C. S. Kochanek; N. Dalal

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We use a simple statistical test to show that the anomalous flux ratios observed in gravitational lenses are created by gravitational perturbations from substructure rather than propagation effects in the interstellar medium or incomplete models for the gravitational potential of the lens galaxy. We review current estimates that the substructure represents between 0.6% and 7% (90% confidence) of the lens galaxy mass, and outline future observational programs which can improve the results.

Source: http://arxiv.org/abs/astro-ph/0212274v1

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Sep 18, 2013
09/13

by
M. Martinis; A. Knežević; G. Krstačić; E. Vargović

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The fractal scaling properties of the heartbeat time series are studied in a controlled ergometric regime using the Hurst rescaled range R/S analysis. The long-time "memory effect" quantified by the value of the Hurst exponent $H>0.5$ is found to increase during progresive physical activity at healthy subjects in contrast to those having stable angina pectoris (SAP), where it is decreasing. We argue that this finding may be used as a useful new diagnostic parameter for short...

Source: http://arxiv.org/abs/physics/0212029v1

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Sep 18, 2013
09/13

by
Vassiliki Kalogera; Chunglee Kim; Duncan R. Lorimer

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We present an analysis method that allows us to estimate the Galactic formation of radio pulsar populations based on their observed properties and our understanding of survey selection effects. More importantly, this method allows us to assign a statistical significance to such rate estimates and calculate the allowed ranges of values at various confidence levels. Here, we apply the method to the question of the double neutron star (NS-NS) coalescence rate using the current observed sample, and...

Source: http://arxiv.org/abs/astro-ph/0212048v1

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Sep 18, 2013
09/13

by
W. Götze; Th. Voigtmann

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Within the mode-coupling theory for idealized glass transitions, we study the evolution of structural relaxation in binary mixtures of hard spheres with size ratios $\delta$ of the two components varying between 0.5 and 1.0. We find two scenarios for the glassy dynamics. For small size disparity, the mixing yields a slight extension of the glass regime. For larger size disparity, a plasticization effect is obtained, leading to a stabilization of the liquid due to mixing. For all $\delta$, a...

Source: http://arxiv.org/abs/cond-mat/0212508v1

Topic: npr all things considered

Topic: npr all things considered

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Sep 21, 2013
09/13

by
M. G. Cosenza; K. Tucci

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General hierarchical lattices of coupled maps are considered as dynamical systems. These models may describe many processes occurring in heterogeneous media with tree-like structures. The transition to turbulence via spatiotemporal intermittency is investigated for these geometries. Critical exponents associated to the onset of turbulence are calculated as functions of the parameters of the systems. No evidence of nontrivial collective behavior is observed in the global quantity used to...

Source: http://arxiv.org/abs/chao-dyn/9907025v2

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Sep 18, 2013
09/13

by
Bing Zhang; Peter Meszaros; Junfeng Wang

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Extensive observational campaigns of afterglow hunting have greatly enriched our understanding of the gamma-ray burst (GRB) phenomenon. Efforts have been made recently to explore some afterglow properties or signatures that will be tested by the on-going or the future observational campaigns yet come. These include the properties of GRB early afterglows in the temporal domain; the GeV-TeV afterglow signatures in the spectral domain; as well as a global view about the GRB universal structured...

Source: http://arxiv.org/abs/astro-ph/0212015v1

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Sep 18, 2013
09/13

by
V. N. Gamezo; A. M. Khokhlov; E. S. Oran; A. Y. Chtchelkanova; R. O. Rosenberg

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Large-scale three-dimensional numerical simulations of the deflagration stage of a thermonuclear supernova explosion show the formation and evolution of a highly convoluted turbulent flame in a gravitational field of an expanding carbon-oxygen white dwarf. The flame dynamics is dominated by the gravity-induced Rayleigh-Taylor instability that controls the burning rate. The thermonuclear deflagration releases enough energy to produce a healthy explosion. The turbulent flame, however, leaves...

Source: http://arxiv.org/abs/astro-ph/0212054v1

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Sep 18, 2013
09/13

by
S. Foteinopoulou; C. M. Soukoulis

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We systematically examine the conditions of obtaining left-handed (LH) behavior in photonic crystals. Detailed studies of the phase and group velocities as well as the phase np and group ng refractive index are given. The existence of negative refraction does not guarantee the existence of negative index of refraction and so LH behavior. A wedge type of experiment is suggested that can unambiguously distiguinsh between cases of negative refraction that occur when left-handed behavior is...

Source: http://arxiv.org/abs/cond-mat/0212434v1

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Sep 18, 2013
09/13

by
Giovanni Arcioni; Matthias Blau; Martin O'Loughlin

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We study Chern-Simons theory with a complex G_C or a real G x G gauge group on a manifold with boundary - this includes Lorentzian and Euclidean (anti-) de Sitter (E/A)dS gravity for G=SU(2) or G=SL(2,R). We show that there is a canonical choice of boundary conditions that leads to an unambiguous, fully covariant and gauge invariant, off-shell derivation of the boundary action - a G_C/G or G WZW model, coupled in a gauge invariant way to the boundary value of the gauge field. In particular, for...

Source: http://arxiv.org/abs/hep-th/0210089v2

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Sep 17, 2013
09/13

by
Raul Rabadan; Frederic Zamora

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We analyse some physical consequences when supersymmetry is broken by a set of D-branes and/or orientifold planes in Type II string theories. Generically, there are global dilaton tadpoles at the disk level when the transverse space is compact. By taking the toy model of a set of electric charges in a compact space, we discuss two different effects appearing when global tadpoles are not cancelled. On the compact directions a constant term appears that allows to solve the equations of motion. On...

Source: http://arxiv.org/abs/hep-th/0207178v3

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Sep 18, 2013
09/13

by
John J. Benedetto; Wojciech Czaja; Andrei Ya. Maltsev

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In this paper we extend the Balian--Low theorem, which is a version of the uncertainty principle for Gabor (Weyl--Heisenberg) systems, to functions of several variables. In particular, we first prove the Balian--Low theorem for arbitrary quadratic forms. Then we generalize further and prove the Balian--Low theorem for differential operators associated with a symplectic basis for the symplectic form on ${\mathbb R}^{2d}$.

Source: http://arxiv.org/abs/math/0212186v1

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Sep 18, 2013
09/13

by
J. P. Blakeslee; K. R. Anderson; G. R. Meurer; N. Benitez; D. Magee

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We have written an automatic image processing pipeline for the Advanced Camera for Surveys (ACS) Guaranteed Time Observation (GTO) program. The pipeline, known as Apsis, supports the different cameras available on the ACS instrument and is written in Python with a flexible object-oriented design that simplifies the incorporation of new pipeline modules. The processing steps include empirical determination of image offsets and rotation, cosmic ray rejection, image combination using the drizzle...

Source: http://arxiv.org/abs/astro-ph/0212362v1

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Sep 18, 2013
09/13

by
Milan M. Cirkovic

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The recent surge of interest in the origin of the temporal asymmetry of thermodynamical systems (including the accessible part of the universe itself) put forward two possible explanatory approaches to this age-old problem. Hereby we show that there is a third possible alternative, based on the generalization of the classical ("Boltzmann-Schuetz") anthropic fluctuation picture of the origin of the perceived entropy gradient. This alternative (which we dub the Acausal-Anthropic...

Source: http://arxiv.org/abs/astro-ph/0212511v1

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Sep 18, 2013
09/13

by
L. Stodolsky; Pierre van Baal; V. I. Zakharov

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It is shown how in principle for non-abelian gauge theories it is possible in the finite volume hamiltonian framework to make sense of calculating the expectation value of ||A||^2=\int d^3x(A^a_i(x))^2. Gauge invariance requires one to replace ||A||^2 by its minimum over the gauge orbit, which makes it a highly non-local quantity. We comment on the difficulty of finding a gauge invariant expression for ||A||^2_{min} analogous to that found for the abelian case, and the relation of this question...

Source: http://arxiv.org/abs/hep-th/0210204v2

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Sep 18, 2013
09/13

by
Ori J. Ganor; Uday Varadarajan

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We argue that the effective field theory on D3-branes in a plane-wave background with 3-form flux is a nonlocal deformation of Yang-Mills theory. In the case of NSNS flux, it is a dipole field theory with lightlike dipole vectors. For an RR 3-form flux the dipole theory is strongly coupled. We propose a weakly coupled S-dual description for it. The S-dual description is local at any finite order in string perturbation theory but becomes nonlocal when all perturbation theory orders are summed...

Source: http://arxiv.org/abs/hep-th/0210035v3

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Sep 18, 2013
09/13

by
J. Barcelos-Neto

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We consider a noncommutative theory developed in a curved background. We show that the Moyal product has to be conveniently modified and, consequently, some of its old properties are lost compared with the flat case. We also address the question of diffeomorphism symmetry.

Source: http://arxiv.org/abs/hep-th/0212094v1

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Sep 18, 2013
09/13

by
Moira Chas; Dennis Sullivan

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This paper explains the conjectured algebraic duality between genus zero Gromov-Witten theory and genus zero "Closed String topology". This duality in another perspective is discussed on page 87 of the book "Frobenius manifold, quantum cohomology, and moduli spaces" (by Yuri Manin). This paper also discusses Fulton MacPherson strata.

Source: http://arxiv.org/abs/math/0212358v1

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Sep 18, 2013
09/13

by
H. Nishimura; G. Lambertson; J. G. Kalnins; H. Gould

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Using calculations and mathematical modeling, we demonstrate the feasibility of constructing a synchrotron storage ring for neutral polar molecules. The lattice is a racetrack type 3.6 m in circumference consisting of two of 180-degree arcs, six bunchers, and two long straight sections. Each straight section contains two triplet focusing lenses and space for beam injection and experiments. The design also includes a matched injector and a linear decelerator. Up to 60 bunches can be loaded and...

Source: http://arxiv.org/abs/physics/0212044v1

This thesis analyzes the perceptions of a non-random sample of 210 officers and enlisted Marines in two locations. A researcher-developed survey and semi-structured interviews were administered to ascertain opinions of Marines concerning leadership development. An analysis of the content of leadership training and education courses was also conducted. This information was compared to contemporary leadership theory and relevant models of leadership. In general, leadership development provided is...

Topics: Leadership, Military education, Core Values, Leadership Training and Education, Professional...

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Sep 17, 2013
09/13

by
Garnik G. Alexanian; A. P. Balachandran; Pedro J. Silva

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A study of the relation between topology change, energy and Lie algebra representations for fuzzy geometry in connection to $M$-theory is presented. We encounter two different types of topology change, related to the different features of the Lie algebra representations appearing in the matrix models of $M$-theory. From these studies, we propose a new method of obtaining non-commutative solutions for the non-Abelian $D$-brane action found by Myers. This mechanism excludes one of the two...

Source: http://arxiv.org/abs/hep-th/0207052v2

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Sep 18, 2013
09/13

by
H. Yoshiguchi; S. Nagataki; K. Sato; N. Ohama; S. Okamura

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If Ultra-High Energy Cosmic Rays (UHECRs) are originated from nearby galaxies, modeling of the distribution of nearby galaxies is important to an accurate estimate the source number density of UHECRs. We investigate uncertainty of the selection function of the Optical Redshift Survey (ORS), which we used to construct a source model of UHECRs. The investigation is based on a comparison of numbe counts of ORS galaxies with those of the spectroscopic sample of the Sloan Digital Sky Survey (SDSS)...

Source: http://arxiv.org/abs/astro-ph/0212061v2

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Sep 18, 2013
09/13

by
V. De Grandis; P. Gallo; M. Rovere

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Computer simulation studies of aqueous solutions of argon are performed from ambient to supercritical conditions by using a recent polarizable potential model (BSV) and the non polarizable simple point charge extended (SPC/E) model. At T=673 K we compare the water-solute pair correlation functions of the argon-water mixture with recent experimental results obtained from neutron scattering experiments. The comparison shows that the introduction of the polarizable effects decreases the...

Source: http://arxiv.org/abs/cond-mat/0212150v1

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Sep 18, 2013
09/13

by
A. Yu. Olshanskii; M. V. Sapir

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For every finitely generated recursively presented group G we construct a finitely presented group H containing G such that G is (Frattini) embedded into H and the group H has solvable conjugacy problem if and only if G has solvable conjugacy problem. Moreover G and H have the same r.e. Turing degrees of the conjugacy problem. This solves a problem by D. Collins.

Source: http://arxiv.org/abs/math/0212227v1

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7.0

Dec 30, 2015
12/15

by
Water Mark Church

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Topics: Water Mark Church, Todd Wagner

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2.0

movies

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Sep 18, 2013
09/13

by
Djamel Ouerdane; for the BRAHMS Collaboration

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Yields of charged particles (pi+, pi-, K+, K-, p and p-bar) have been derived from spectra measured with BRAHMS for the reaction Au+Au at sqrt(sNN) = 200 GeV, as a function of rapidity in the range y = 0 to y ~ 3 for the 10% most central events. The yields peak at mid-rapidity with a small decrease in the range |y| < 1 but they drop significantly at higher rapidities except for the protons. At y = 0, the K-/pi- ratio is 0.18 +/- 0.02 (syst), very close to the K+/pi+ ratio equal to 0.19 +/-...

Source: http://arxiv.org/abs/nucl-ex/0212001v3

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Sep 17, 2013
09/13

by
Michal Horodecki; Jonathan Oppenheim; Ryszard Horodecki

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We argue that on its face, entanglement theory satisfies laws equivalent to thermodynamics if the theory can be made reversible by adding certain bound entangled states as a free resource during entanglement manipulation. Subject to plausible assumptions, we prove that this is not the case in general, and discuss the implications of this for the thermodynamics of entanglement.

Source: http://arxiv.org/abs/quant-ph/0207177v3

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Sep 18, 2013
09/13

by
Douglas N. Arnold

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Differential complexes such as the de Rham complex have recently come to play an important role in the design and analysis of numerical methods for partial differential equations. The design of stable discretizations of systems of partial differential equations often hinges on capturing subtle aspects of the structure of the system in the discretization. In many cases the differential geometric structure captured by a differential complex has proven to be a key element, and a discrete...

Source: http://arxiv.org/abs/math/0212391v1

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Sep 18, 2013
09/13

by
Jonathan C. Tan; Christopher F. McKee

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How massive were the first stars? This question is of fundamental importance for galaxy formation and cosmic reionization. Here we consider how protostellar feedback can limit the mass of a forming star. For this we must understand the rate at which primordial protostars accrete, how they and their feedback output evolve, and how this feedback interacts with the infalling matter. We describe the accretion rate with an ``isentropic accretion'' model: the rate is initially very large (~0.03...

Source: http://arxiv.org/abs/astro-ph/0212283v1

Topics: Kenneth Copeland Ministries, Believer's Voice of Victory, Kenneth Copeland

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Sep 18, 2013
09/13

by
A. Meli; J. J. Quenby

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We perform Monte Carlo simulations of diffusive shock acceleration at highly relativistic oblique shock waves. High upstream flow Lorentz gamma factors are used, which are relevant to models of ultra relativistic particle shock acceleration in Active Galactic Nuclei (AGN) central engines and relativistic jets and Gamma Ray Burst (GRB) fireballs. We investigate numerically the acceleration properties -in the ultra relativistic flow regime of $\Gamma \sim 10-10^{3}$- such as angular distribution,...

Source: http://arxiv.org/abs/astro-ph/0212329v1

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Sep 18, 2013
09/13

by
L. Sriramkumar

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We consider the response of a uniformly accelerated monopole detector that is coupled to a superposition of an odd and an even power of a quantized, massless scalar field in flat spacetime in arbitrary dimensions. We show that, when the field is assumed to be in the Minkowski vacuum, the response of the detector is characterized by a Bose-Einstein factor in even spacetime dimensions, whereas a Bose-Einstein as well as a Fermi-Dirac factor appear in the detector response when the dimension of...

Source: http://arxiv.org/abs/gr-qc/0212084v1

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Sep 18, 2013
09/13

by
John F. Gunion

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I give a brief overview of the motivations for and experimental probes of extended Higgs sectors containing more than the single Higgs doublet field of the Standard Model.

Source: http://arxiv.org/abs/hep-ph/0212150v1

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Sep 18, 2013
09/13

by
Federico Rodriguez Hertz

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We prove that some ergodic linear automorphisms of $\T^N$ are stably ergodic, i.e. any small perturbation remains ergodic. The class of linear automorphisms we deal with includes all non-Anosov ergodic automorphisms when N=4 and so, as a corollary, we get that every ergodic linear automorphism of $\T^N$ is stably ergodic when $N\leq 5$.

Source: http://arxiv.org/abs/math/0212345v1

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Sep 18, 2013
09/13

by
Bruce J. West; Nicola Scafetta

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We present a nonlinear stochastic model of the human gait control system in a variety of gait regimes. The stride interval time series in normal human gait is characterized by slightly multifractal fluctuations. The fractal nature of the fluctuations become more pronounced under both an increase and decrease in the average gait. Moreover, the long-range memory in these fluctuations is lost when the gait is keyed on a metronome. The human locomotion is controlled by a network of neurons capable...

Source: http://arxiv.org/abs/cond-mat/0212203v1

The State Council of Higher Education for Virginia (SCHEV) has collaborated with education leaders from colleges, universities, and elementary- and secondary-education institutions, business and industry leaders, and members of the state government to develop a strategic plan for higher education for Virginia. The plan acknowledges the enrollment and economic development pressures on the state system of higher education. The system of higher education must: (1) accommodate at least 38,000...

Topics: ERIC Archive, Colleges, Educational Improvement, Educational Planning, Higher Education, State...

A core component of many new educational programs funded under the "No Child Left Behind Act of 2001" is that they be based on scientifically based research. Like others in the educational community, counselors and counseling researchers welcome the opportunity to empirically test the validity of their practices and demonstrate that what they do makes a positive difference in students' lives. But they also have many concerns about the practical feasibility of implementing...

Topics: ERIC Archive, Accountability, Counseling, Counseling Effectiveness, School Counselors, Scientific...

The Air Force started development of the Blair Lakes Range in the early 1970s and has since that time used the range as an important training facility for strafing and bombing practice. In early 1993, the Air Force implemented a 25-year plan to improve the infrastructure at the range. The improvements have resulted in improved range operations and have also lessened the impact of range maintenance activities to the wetlands. Most range activities can now be confined to the all-season roads and...

Topics: DTIC Archive, ALASKA CALEDONIA ENVIRONMENTAL SERVICES ESTER, *AIR FORCE FACILITIES, *CONSTRUCTION,...

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Sep 18, 2013
09/13

by
A. Nichols; R. Manvelyan; G. Savvidy

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We suggest a new model of string theory with world-sheet supersymmetry. It possesses an additional global fermionic symmetry which is similar in many ways to BRST symmetry. The spectrum consists of massless states of Rarita-Schwinger fields describing infinite tower of half-integer spins.

Source: http://arxiv.org/abs/hep-th/0212324v1

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Sep 22, 2013
09/13

by
Mar Bastero-Gil; Edmund J. Copeland; James Gray; Andre Lukas; Michael Plumacher

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We present a new scenario for baryogenesis in the context of heterotic brane-world models. The baryon asymmetry of the universe is generated at a small-instanton phase transition which is initiated by a moving brane colliding with the observable boundary. We demonstrate, in the context of a simple model, that reasonable values for the baryon asymmetry can be obtained. As a byproduct we find a new class of moving-brane cosmological solutions in the presence of a perfect fluid.

Source: http://arxiv.org/abs/hep-th/0201040v2

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Sep 18, 2013
09/13

by
Cornelis Storm; Philip Nelson

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We formulate and solve a two-state model for the elasticity of nicked, double-stranded DNA that borrows features from both the Worm Like Chain and the Bragg--Zimm model. Our model is computationally simple, and gives an excellent fit to recent experimental data through the entire overstretching transition. The fit gives the first value for the bending stiffness of the overstretched state as about 10 nm*kbt, a value quite different from either B-form or single-stranded DNA.

Source: http://arxiv.org/abs/physics/0212032v1