Manifestly Covariant Relativity
Kenneth Dalton
2006-08-03T23:59:59.000Z
According to Einstein's principle of general covariance, all laws of nature are to be expressed by manifestly covariant equations. In recent work, the covariant law of energy-momentum conservation has been established. Here, we show that this law gives rise to a fully covariant theory of gravitation and that Einstein's field equations yield total energy-momentum conservation.
Ungerer, Theo
connection between nodes enhances communication flexibility. Service development on memory and energy limitedMobile Agents for Wireless Sensor Networks Faruk Bagci1, Julian Wolf1, Theo Ungerer1, and Nader}@informatik.uni-augsburg.de 2Department of Electrical Engineering and Computer Science, University of California, Irvine, USA
Covariant Noncommutative Field Theory
Estrada-Jimenez, S. [Licenciaturas en Fisica y en Matematicas, Facultad de Ingenieria, Universidad Autonoma de Chiapas Calle 4a Ote. Nte. 1428, Tuxtla Gutierrez, Chiapas (Mexico); Garcia-Compean, H. [Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del IPN P.O. Box 14-740, 07000 Mexico D.F., Mexico and Centro de Investigacion y de Estudios Avanzados del IPN, Unidad Monterrey Via del Conocimiento 201, Parque de Investigacion e Innovacion Tecnologica (PIIT) Autopista nueva al Aeropuerto km 9.5, Lote 1, Manzana 29, cp. 66600 Apodaca Nuevo Leon (Mexico); Obregon, O. [Instituto de Fisica de la Universidad de Guanajuato P.O. Box E-143, 37150 Leon Gto. (Mexico); Ramirez, C. [Facultad de Ciencias Fisico Matematicas, Universidad Autonoma de Puebla, P.O. Box 1364, 72000 Puebla (Mexico)
2008-07-02T23:59:59.000Z
The covariant approach to noncommutative field and gauge theories is revisited. In the process the formalism is applied to field theories invariant under diffeomorphisms. Local differentiable forms are defined in this context. The lagrangian and hamiltonian formalism is consistently introduced.
Covariant Hamiltonian Field Theory
Jürgen Struckmeier; Andreas Redelbach
2012-05-22T23:59:59.000Z
A consistent, local coordinate formulation of covariant Hamiltonian field theory is presented. Whereas the covariant canonical field equations are equivalent to the Euler-Lagrange field equations, the covariant canonical transformation theory offers more general means for defining mappings that preserve the form of the field equations than the usual Lagrangian description. It is proved that Poisson brackets, Lagrange brackets, and canonical 2-forms exist that are invariant under canonical transformations of the fields. The technique to derive transformation rules for the fields from generating functions is demonstrated by means of various examples. In particular, it is shown that the infinitesimal canonical transformation furnishes the most general form of Noether's theorem. We furthermore specify the generating function of an infinitesimal space-time step that conforms to the field equations.
Extremal covariant measurements
G. Chiribella; G. M. D'Ariano
2006-03-20T23:59:59.000Z
We characterize the extremal points of the convex set of quantum measurements that are covariant under a finite-dimensional projective representation of a compact group, with action of the group on the measurement probability space which is generally non-transitive. In this case the POVM density is made of multiple orbits of positive operators, and, in the case of extremal measurements, we provide a bound for the number of orbits and for the rank of POVM elements. Two relevant applications are considered, concerning state discrimination with mutually unbiased bases and the maximization of the mutual information.
Covariance regularization in inverse space
Administrator
Apr 1, 2009 ... the data multiplied by a scale factor (Oke er of, 2002), .... covariances, where the vertical correlation scale depends .... Before examining local.
Backe, Knut
process of oilwell cement slurries. The theo- retical relationship among conductivity, porosity, cement and that rapid hydration will reduce the risk of gas migration. Introduction The main purposes of oilwell cements hardening process of oilwell cement slurries is important for successful cementing operations. Several
Covariance evaluation work at LANL
Kawano, Toshihiko [Los Alamos National Laboratory; Talou, Patrick [Los Alamos National Laboratory; Young, Phillip [Los Alamos National Laboratory; Hale, Gerald [Los Alamos National Laboratory; Chadwick, M B [Los Alamos National Laboratory; Little, R C [Los Alamos National Laboratory
2008-01-01T23:59:59.000Z
Los Alamos evaluates covariances for nuclear data library, mainly for actinides above the resonance regions and light elements in the enUre energy range. We also develop techniques to evaluate the covariance data, like Bayesian and least-squares fitting methods, which are important to explore the uncertainty information on different types of physical quantities such as elastic scattering angular distribution, or prompt neutron fission spectra. This paper summarizes our current activities of the covariance evaluation work at LANL, including the actinide and light element data mainly for the criticality safety study and transmutation technology. The Bayesian method based on the Kalman filter technique, which combines uncertainties in the theoretical model and experimental data, is discussed.
Covariant Geometric Prequantization of Fields
Kanatchikov, I V
2002-01-01T23:59:59.000Z
A geometric prequantization formula for the Poisson-Gerstenhaber bracket on forms found within the DeDonder-Weyl Hamiltonian formalism earlier is presented. The related aspects of covariant geometric quantization of field theories are sketched. In particular, the importance of the framework of Clifford and spinor bundles and superconnections in this context is underlined.
Covariant Geometric Prequantization of Fields
I. V. Kanatchikov
2001-01-04T23:59:59.000Z
A geometric prequantization formula for the Poisson-Gerstenhaber bracket of forms found within the DeDonder-Weyl Hamiltonian formalism earlier is presented. The related aspects of covariant geometric quantization of field theories are sketched. In particular, the importance of the framework of Clifford and spinor bundles and superconnections in this context is underlined.
Noncommutative electrodynamics with covariant coordinates
Zahn, Jochen [II. Institut fuer Theoretische Physik, Universitaet Hamburg, Luruper Chausse 149, 22761 Hamburg (Germany)
2004-11-15T23:59:59.000Z
We study noncommutative electrodynamics using the concept of covariant coordinates. We propose a scheme for interpreting the formalism and construct two basic examples, a constant field and a plane wave. Superposing these two, we find a modification of the dispersion relation. Our results differ from those obtained via the Seiberg-Witten map.
GENERATION OF PRESCRIBED NONSTATIONARY COVARIANCES
Moore, John Barratt
by white noise, and the covariance of the output of the system. More precisely, systems of the form ; = F(t)x This paper is concerned with establishing connections between the matrices describing a system excited#'be interested in simulating R (t,T) for t, T `tO using a system (l); then it is necessary to }s ecify not merely
Alpay, S. Pamir
and M. C. Flemings, "Influence of Coarsening on Dendrite Arm Spacing of Aluminum-Copper Alloys", Trans of Copper in a High Strength Aluminum Alloy (KO-1)", Scripta Met., Vol. 6, 1972, p. 101. 19. G. W of a High Strength Aluminum Alloy (KO-1)", Met. Trans., Vol. 4, 1973, p. 1069. 27. J. N. Lanzafame and T. Z
Covariance Evaluation Methodology for Neutron Cross Sections
Herman,M.; Arcilla, R.; Mattoon, C.M.; Mughabghab, S.F.; Oblozinsky, P.; Pigni, M.; Pritychenko, b.; Songzoni, A.A.
2008-09-01T23:59:59.000Z
We present the NNDC-BNL methodology for estimating neutron cross section covariances in thermal, resolved resonance, unresolved resonance and fast neutron regions. The three key elements of the methodology are Atlas of Neutron Resonances, nuclear reaction code EMPIRE, and the Bayesian code implementing Kalman filter concept. The covariance data processing, visualization and distribution capabilities are integral components of the NNDC methodology. We illustrate its application on examples including relatively detailed evaluation of covariances for two individual nuclei and massive production of simple covariance estimates for 307 materials. Certain peculiarities regarding evaluation of covariances for resolved resonances and the consistency between resonance parameter uncertainties and thermal cross section uncertainties are also discussed.
Perturbation theory in covariant canonical quantization
Sayandeb Basu
2004-12-22T23:59:59.000Z
I investigate a new idea of perturbation theory in covariant canonical quantization. I present preliminary results for a toy model of a harmonic oscillator with a quartic perturbation, and show that this method reproduces the quantized spectrum of standard quantum theory. This result indicates that when the exact solutions to classical equations are not known, covariant canonical quantization via perturbation theory could be a viable approximation scheme for finding observables, and suggests a physically interesting way of extending the scope of covariant canonical quantization in quantum gravity
Visualizing Distributions of Covariance Matrices Tomoki Tokudaa
Gelman, Andrew
Background Covariance matrices and their corresponding distributions play an important role in statis- tics of Education Science grant #ED-GRANTS-032309-005, Institute of Education Science grant #R305D090006-09A
Noncommutative Gauge Theory with Covariant Star Product
Zet, G. [Physics Department, 'Gh. Asachi' Technical University, 700050 Iasi (Romania)
2010-08-04T23:59:59.000Z
We present a noncommutative gauge theory with covariant star product on a space-time with torsion. In order to obtain the covariant star product one imposes some restrictions on the connection of the space-time. Then, a noncommutative gauge theory is developed applying this product to the case of differential forms. Some comments on the advantages of using a space-time with torsion to describe the gravitational field are also given.
Covariant Quantum Green's Function for an Accelerated Particle
T. Garavaglia
2001-04-03T23:59:59.000Z
Covariant relativistic quantum theory is used to study the covariant Green's function, which can be used to determine the proper time evolved wave functions that are solutions to the covariant Schr\\"odinger type equation for a massive spin zero particle. The concept of covariant action is used to obtain the Green's function for an accelerated relativistic particle.
Covariant Lyapunov vectors for rigid disk systems
Hadrien Bosetti; Harald A. Posch
2010-06-30T23:59:59.000Z
We carry out extensive computer simulations to study the Lyapunov instability of a two-dimensional hard disk system in a rectangular box with periodic boundary conditions. The system is large enough to allow the formation of Lyapunov modes parallel to the x axis of the box. The Oseledec splitting into covariant subspaces of the tangent space is considered by computing the full set of covariant perturbation vectors co-moving with the flow in tangent-space. These vectors are shown to be transversal, but generally not orthogonal to each other. Only the angle between covariant vectors associated with immediate adjacent Lyapunov exponents in the Lyapunov spectrum may become small, but the probability of this angle to vanish approaches zero. The stable and unstable manifolds are transverse to each other and the system is hyperbolic.
General Covariance in Algebraic Quantum Field Theory
Romeo Brunetti; Martin Porrmann; Giuseppe Ruzzi
2005-12-17T23:59:59.000Z
In this review we report on how the problem of general covariance is treated within the algebraic approach to quantum field theory by use of concepts from category theory. Some new results on net cohomology and superselection structure attained in this framework are included.
Covariant Photon Quantization in the SME
Colladay, Don
2013-01-01T23:59:59.000Z
The Gupta Bleuler quantization procedure is applied to the SME photon sector. A direct application of the method to the massless case fails due to an unavoidable incompleteness in the polarization states. A mass term can be included into the photon lagrangian to rescue the quantization procedure and maintain covariance.
Covariant Photon Quantization in the SME
Don Colladay
2013-09-23T23:59:59.000Z
The Gupta Bleuler quantization procedure is applied to the SME photon sector. A direct application of the method to the massless case fails due to an unavoidable incompleteness in the polarization states. A mass term can be included into the photon lagrangian to rescue the quantization procedure and maintain covariance.
Modeling covariance structure in unbalanced longitudinal data
Chen, Min
2009-05-15T23:59:59.000Z
CHAPTER I INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 II A REVIEW OF MODELING COVARIANCE MATRICES WITH MODIFIED CHOLESKY DECOMPOSITION . . . . . . 5 2.1 Modified Cholesky Decomposition . . . . . . . . . . . . . . 5 2.2 Fixed... Linear Mixed Models . . . . . . . . . . . . . 14 2.6 Linear Mixed-Effects Models: Balanced Longitudinal Data 15 III FIXED-EFFECTS MODELS WITH UNBALANCED LON- GITUDINAL DATA . . . . . . . . . . . . . . . . . . . . . . . . 19 3.1 Introduction...
GARCH Process with Persistent Covariates Heejoon Han1
Chaudhuri, Sanjay
GARCH Process with Persistent Covariates Heejoon Han1 RMI Working Paper No. 08/01 Submitted or nearly integrated, covariate in the standard GARCH(1,1) model. First, we establish the asymptotic a relevant persistent covariate in the GARCH(1,1) process. Moreover, the kurtosis of the model is randomly
Covariant Lyapunov Analysis of NavierStokes Turbulence
RIMSÂ1770 Covariant Lyapunov Analysis of NavierÂStokes Turbulence By Masanobu INUBUSHI January 2013 RESEARCH INSTITUTE FOR MATHEMATICAL SCIENCES KYOTO UNIVERSITY, Kyoto, Japan #12; Covariant Lyapunov of the important properties of chaos. Particularly, we employ covariant Lyapunov analysis recently developed
Covariant Lyapunov Analysis of Navier-Stokes Turbulence
RIMS-1770 Covariant Lyapunov Analysis of Navier-Stokes Turbulence By Masanobu INUBUSHI January 2013 RESEARCH INSTITUTE FOR MATHEMATICAL SCIENCES KYOTO UNIVERSITY, Kyoto, Japan #12;Covariant Lyapunov Analysis of chaos. Particularly, we employ covariant Lyapunov analysis recently developed by Ginelli et al. (2007
Nuclear fission in covariant density functional theory
A. V. Afanasjev; H. Abusara; P. Ring
2013-09-12T23:59:59.000Z
The current status of the application of covariant density functional theory to microscopic description of nuclear fission with main emphasis on superheavy nuclei (SHN) is reviewed. The softness of SHN in the triaxial plane leads to an emergence of several competing fission pathes in the region of the inner fission barrier in some of these nuclei. The outer fission barriers of SHN are considerably affected both by triaxiality and octupole deformation.
Decoherence rates for Galilean covariant dynamics
Jeremy Clark
2008-04-02T23:59:59.000Z
We introduce a measure of decoherence for a class of density operators. For Gaussian density operators in dimension one it coincides with an index used by Morikawa (1990). Spatial decoherence rates are derived for three large classes of the Galilean covariant quantum semigroups introduced by Holevo. We also characterize the relaxation to a Gaussian state for these dynamics and give a theorem for the convergence of the Wigner function to the probability distribution of the classical analog of the process.
Twisted covariant noncommutative self-dual gravity
Estrada-Jimenez, S.; Garcia-Compean, H.; Obregon, O.; Ramirez, C. [Centro de Estudios en Fisica y Matematicas Basicas y Aplicadas, Universidad Autonoma de Chiapas, Calle 4 Oriente Norte 1428, Tuxtla Gutierrez, Chiapas (Mexico); Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del IPN, P.O. Box 14-740, 07000 Mexico D.F. (Mexico); Centro de Investigacion y de Estudios Avanzados del IPN, Unidad Monterrey, PIIT, Via del Conocimiento 201, Autopista nueva al Aeropuerto km 9.5, 66600, Apodaca Nuevo Leon (Mexico); Instituto de Fisica de la Universidad de Guanajuato, P.O. Box E-143, 37150, Leon Gto. (Mexico); Facultad de Ciencias Fisico Matematicas, Universidad Autonoma de Puebla, P.O. Box 1364, 72000, Puebla (Mexico)
2008-12-15T23:59:59.000Z
A twisted covariant formulation of noncommutative self-dual gravity is presented. The formulation for constructing twisted noncommutative Yang-Mills theories is used. It is shown that the noncommutative torsion is solved at any order of the {theta} expansion in terms of the tetrad and some extra fields of the theory. In the process the first order expansion in {theta} for the Plebanski action is explicitly obtained.
Development of covariance capabilities in EMPIRE code
Herman,M.; Pigni, M.T.; Oblozinsky, P.; Mughabghab, S.F.; Mattoon, C.M.; Capote, R.; Cho, Young-Sik; Trkov, A.
2008-06-24T23:59:59.000Z
The nuclear reaction code EMPIRE has been extended to provide evaluation capabilities for neutron cross section covariances in the thermal, resolved resonance, unresolved resonance and fast neutron regions. The Atlas of Neutron Resonances by Mughabghab is used as a primary source of information on uncertainties at low energies. Care is taken to ensure consistency among the resonance parameter uncertainties and those for thermal cross sections. The resulting resonance parameter covariances are formatted in the ENDF-6 File 32. In the fast neutron range our methodology is based on model calculations with the code EMPIRE combined with experimental data through several available approaches. The model-based covariances can be obtained using deterministic (Kalman) or stochastic (Monte Carlo) propagation of model parameter uncertainties. We show that these two procedures yield comparable results. The Kalman filter and/or the generalized least square fitting procedures are employed to incorporate experimental information. We compare the two approaches analyzing results for the major reaction channels on {sup 89}Y. We also discuss a long-standing issue of unreasonably low uncertainties and link it to the rigidity of the model.
Development of Covariance Capabilities in EMPIRE Code
Herman, M. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)], E-mail: mwherman@bnl.gov; Pigni, M.T.; Oblozinsky, P.; Mughabghab, S.F.; Mattoon, C.M. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States); Capote, R. [Nuclear Data Section, IAEA, Vienna (Austria); Cho, Young-Sik [KAERI, Daejeon (Korea, Republic of); Trkov, A. [Jozef Stefan Institute, Ljubljana (Slovenia)
2008-12-15T23:59:59.000Z
The nuclear reaction code EMPIRE has been extended to provide evaluation capabilities for neutron cross section covariances in the thermal, resolved resonance, unresolved resonance and fast neutron regions. The Atlas of Neutron Resonances by Mughabghab is used as a primary source of information on uncertainties at low energies. Care is taken to ensure consistency among the resonance parameter uncertainties and those for thermal cross sections. The resulting resonance parameter covariances are formatted in the ENDF-6 File 32. In the fast neutron range our methodology is based on model calculations with the code EMPIRE combined with experimental data through several available approaches. The model-based covariances can be obtained using deterministic (Kalman) or stochastic (Monte Carlo) propagation of model parameter uncertainties. We show that these two procedures yield comparable results. The Kalman filter and/or the generalized least square fitting procedures are employed to incorporate experimental information. We compare the two approaches analyzing results for the major reaction channels on {sup 89}Y. We also discuss a long-standing issue of unreasonably low uncertainties and link it to the rigidity of the model.
AFCI-2.0 Library of Neutron Cross Section Covariances
Herman, M.; Herman,M.; Oblozinsky,P.; Mattoon,C.; Pigni,M.; Hoblit,S.; Mughabghab,S.F.; Sonzogni,A.; Talou,P.; Chadwick,M.B.; Hale.G.M.; Kahler,A.C.; Kawano,T.; Little,R.C.; Young,P.G.
2011-06-26T23:59:59.000Z
Neutron cross section covariance library has been under development by BNL-LANL collaborative effort over the last three years. The primary purpose of the library is to provide covariances for the Advanced Fuel Cycle Initiative (AFCI) data adjustment project, which is focusing on the needs of fast advanced burner reactors. The covariances refer to central values given in the 2006 release of the U.S. neutron evaluated library ENDF/B-VII. The preliminary version (AFCI-2.0beta) has been completed in October 2010 and made available to the users for comments. In the final 2.0 release, covariances for a few materials were updated, in particular new LANL evaluations for {sup 238,240}Pu and {sup 241}Am were adopted. BNL was responsible for covariances for structural materials and fission products, management of the library and coordination of the work, while LANL was in charge of covariances for light nuclei and for actinides.
Optimization Online - Construction of Covariance Matrices with a ...
So Yeon Chun
2008-06-13T23:59:59.000Z
Jun 13, 2008 ... Construction of Covariance Matrices with a specified Discrepancy Function Minimizer, with Application to Factor Analysis. So Yeon Chun ...
EMPIRE ULTIMATE EXPANSION: RESONANCES AND COVARIANCES.
HERMAN,M.; MUGHABGHAB, S.F.; OBLOZINSKY, P.; ROCHMAN, D.; PIGNI, M.T.; KAWANO, T.; CAPOTE, R.; ZERKIN, V.; TRKOV, A.; SIN, M.; CARSON, B.V.; WIENKE, H. CHO, Y.-S.
2007-04-22T23:59:59.000Z
The EMPIRE code system is being extended to cover the resolved and unresolved resonance region employing proven methodology used for the production of new evaluations in the recent Atlas of Neutron Resonances. Another directions of Empire expansion are uncertainties and correlations among them. These include covariances for cross sections as well as for model parameters. In this presentation we concentrate on the KALMAN method that has been applied in EMPIRE to the fast neutron range as well as to the resonance region. We also summarize role of the EMPIRE code in the ENDF/B-VII.0 development. Finally, large scale calculations and their impact on nuclear model parameters are discussed along with the exciting perspectives offered by the parallel supercomputing.
Kalman Filtering with Uncertain Noise Covariances Srikiran Kosanam Dan Simon
Simon, Dan
Kalman Filtering with Uncertain Noise Covariances Srikiran Kosanam Dan Simon Department.kosanam@csuohio.edu d.j.simon@csuohio.edu Abstract - In this paper the robustness of Kalman filtering against uncertainties in process and measurement noise covariances is discussed. It is shown that a standard Kalman
Generalized Covariant Gyrokinetic Dynamics of Magnetoplasmas
Cremaschini, C. [Department of Astronomy, University of Trieste, Trieste (Italy); Tessarotto, M. [Department of Mathematics and Informatics, University of Trieste, Trieste (Italy); Consortium of Magneto-fluid-dynamics, University of Trieste, Trieste (Italy); Nicolini, P. [Department of Mathematics and Informatics, University of Trieste, Trieste (Italy); Beklemishev, A. [Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
2008-12-31T23:59:59.000Z
A basic prerequisite for the investigation of relativistic astrophysical magnetoplasmas, occurring typically in the vicinity of massive stellar objects (black holes, neutron stars, active galactic nuclei, etc.), is the accurate description of single-particle covariant dynamics, based on gyrokinetic theory (Beklemishev et al., 1999-2005). Provided radiation-reaction effects are negligible, this is usually based on the assumption that both the space-time metric and the EM fields (in particular the magnetic field) are suitably prescribed and are considered independent of single-particle dynamics, while allowing for the possible presence of gravitational/EM perturbations driven by plasma collective interactions which may naturally arise in such systems. The purpose of this work is the formulation of a generalized gyrokinetic theory based on the synchronous variational principle recently pointed out (Tessarotto et al., 2007) which permits to satisfy exactly the physical realizability condition for the four-velocity. The theory here developed includes the treatment of nonlinear perturbations (gravitational and/or EM) characterized locally, i.e., in the rest frame of a test particle, by short wavelength and high frequency. Basic feature of the approach is to ensure the validity of the theory both for large and vanishing parallel electric field. It is shown that the correct treatment of EM perturbations occurring in the presence of an intense background magnetic field generally implies the appearance of appropriate four-velocity corrections, which are essential for the description of single-particle gyrokinetic dynamics.
Aspects of locally covariant quantum field theory
Ko Sanders
2008-09-28T23:59:59.000Z
This thesis considers various aspects of locally covariant quantum field theory (LCQFT; see Brunetti et al., Commun.Math.Phys. 237 (2003), 31-68), a mathematical framework to describe axiomatic quantum field theories in curved spacetimes. New results include: a philosophical interpretation of certain aspects of this framework in terms of modal logic; a proof that the truncated n-point functions of any Hadamard state of the free real scalar field are smooth, except for n=2; a description of he free Dirac field in a representation independent way, showing that the theory is determined entirely by the relations between the adjoint map, the charge conjugation map and the Dirac operator; a proof that the relative Cauchy evolution of the free Dirac field is related to its stress-energy-momentum tensor in the same way as for the free real scalar field (cf. loc.cit.); several results on the Reeh-Schlieder property in LCQFT, including but not limited to those of our earlier paper; a new and elegant approach to wave front sets of Banach space-valued distributions, which allows easy proofs and extensions of results in the literature.
Probability, unitarity, and realism in generally covariant quantum information
S. Jay Olson; Jonathan P. Dowling
2008-02-13T23:59:59.000Z
The formalism of covariant quantum theory, introduced by Reisenberger and Rovelli, casts the description of quantum states and evolution into a framework compatable with the principles of general relativity. The leap to this covariant formalism, however, outstripped the standard interpretation used to connect quantum theory to experimental predictions, leaving the predictions of the RR theory ambiguous. Here we discuss in detail some implications of our recently proposed description of covariant quantum information (CQI), which addresses these problems. We show explicit agreement with standard quantum mechanics in the appropriate limit. In addition to compatability with general covariance, we show that our framework has other attractive and satisfying features -- it is fully unitary, realist, and self-contained. The full unitarity of the formalism in the presence of measurements allows us to invoke time-reversal symmetry to obtain new predictions closely related to the quantum Zeno effect.
Probability, unitarity, and realism from generally covariant quantum information
Olson, S Jay
2007-01-01T23:59:59.000Z
The formalism of covariant quantum theory, introduced by Reisenberger and Rovelli, casts the description of quantum states and evolution into a framework compatable with the principles of general relativity. The leap to this fully covariant formalism, however, outstripped the standard interpretation used to connect quantum theory to experimental predictions, leaving the predictions of the theory ambiguous. Here we discuss in detail some implications of our recently proposed description of covariant quantum information, which addresses these problems. We show explicit agreement with standard quantum mechanics in the appropriate limit. In addition to compatability with general covariance, we show that this framework has other attractive and surprising features -- it is fully unitary, realist, and self-contained. The full unitarity of the formalism in the presence of measurements allows us to invoke time-reversal symmetry to obtain new predictions closely related to the quantum Zeno effect.
Covariances from light-element r-martix analyses
Hale, Gerald [Los Alamos National Laboratory
2008-01-01T23:59:59.000Z
We review the method for obtaining covariance information for light-element reactions using R-matrix theory. The general LANL R-matrix analysis code EDA provides accurate covariances for the resonance parameters at a solution due to the search algorithm it uses to find a local minimum of the chi-square surface. This information is used, together with analytically calculated sensitivity derivatives, in the first-order error propagation equation to obtain cross-section covariances for all reactions included in the analysis. Examples are given of the covariances obtained from the EDA analyses for n-p scattering and for the n+{sup 6}Li reactions used in the latest light-element standard cross section evaluation. Also discussed is a method of defining 'pure theory' correlations that could be useful for extensions to higher energies and heavier systems.
AFCI-2.0 Neutron Cross Section Covariance Library
Herman, M.; Herman, M; Oblozinsky, P.; Mattoon, C.M.; Pigni, M.; Hoblit, S.; Mughabghab, S.F.; Sonzogni, A.; Talou, P.; Chadwick, M.B.; Hale, G.M.; Kahler, A.C.; Kawano, T.; Little, R.C.; Yount, P.G.
2011-03-01T23:59:59.000Z
The cross section covariance library has been under development by BNL-LANL collaborative effort over the last three years. The project builds on two covariance libraries developed earlier, with considerable input from BNL and LANL. In 2006, international effort under WPEC Subgroup 26 produced BOLNA covariance library by putting together data, often preliminary, from various sources for most important materials for nuclear reactor technology. This was followed in 2007 by collaborative effort of four US national laboratories to produce covariances, often of modest quality - hence the name low-fidelity, for virtually complete set of materials included in ENDF/B-VII.0. The present project is focusing on covariances of 4-5 major reaction channels for 110 materials of importance for power reactors. The work started under Global Nuclear Energy Partnership (GNEP) in 2008, which changed to Advanced Fuel Cycle Initiative (AFCI) in 2009. With the 2011 release the name has changed to the Covariance Multigroup Matrix for Advanced Reactor Applications (COMMARA) version 2.0. The primary purpose of the library is to provide covariances for AFCI data adjustment project, which is focusing on the needs of fast advanced burner reactors. Responsibility of BNL was defined as developing covariances for structural materials and fission products, management of the library and coordination of the work; LANL responsibility was defined as covariances for light nuclei and actinides. The COMMARA-2.0 covariance library has been developed by BNL-LANL collaboration for Advanced Fuel Cycle Initiative applications over the period of three years, 2008-2010. It contains covariances for 110 materials relevant to fast reactor R&D. The library is to be used together with the ENDF/B-VII.0 central values of the latest official release of US files of evaluated neutron cross sections. COMMARA-2.0 library contains neutron cross section covariances for 12 light nuclei (coolants and moderators), 78 structural materials and fission products, and 20 actinides. Covariances are given in 33-energy groups, from 10?5 eV to 19.6 MeV, obtained by processing with LANL processing code NJOY using 1/E flux. In addition to these 110 files, the library contains 20 files with nu-bar covariances, 3 files with covariances of prompt fission neutron spectra (238,239,240-Pu), and 2 files with mu-bar covariances (23-Na, 56-Fe). Over the period of three years several working versions of the library have been released and tested by ANL and INL reactor analysts. Useful feedback has been collected allowing gradual improvements of the library. In addition, QA system was developed to check basic properties and features of the whole library, allowing visual inspection of uncertainty and correlations plots, inspection of uncertainties of integral quantities with independent databases, and dispersion of cross sections between major evaluated libraries. The COMMARA-2.0 beta version of the library was released to ANL and INL reactor analysts in October 2010. The final version, described in the present report, was released in March 2011.
Generalized covariation and extended Fukushima decompositions for Banach valued processes.
Paris-Sud XI, Université de
Generalized covariation and extended Fukushima decompositions for Banach valued processes corresponding results when B = C([-, 0]) and X = X(·). This will consitute a significant Fukushima decomposition random variables, Malliavin calculus, Generalized Fukushima decomposition. LUISS Guido Carli - Libera
Covariant Weyl quantization, symbolic calculus, and the product formula
Gunturk, Kamil Serkan
2006-08-16T23:59:59.000Z
. The Intrinsic Meaning of nabla? and Parallel Transport . 19 3. GeodesicsandCurvature ................ 22 4. MoreonGeodesicTheory................ 25 III CLASSICAL WEYL-WIGNER FORMALISM .......... 30 A.Pseudo-DifferentialOperators ................ 30 1. The... . 46 B.GeneralCase ......................... 48 1. IntrinsicWidomCalculus................ 48 2. Covariant Weyl Formalism: Fulling?s Definition .... 50 V A COVARIANT WEYL CALCULUS ............... 53 vii CHAPTER Page A...
Low-Fidelity Covariances: Neutron Cross Section Covariance Estimates for 387 Materials
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
"Covariance data are provided for radiative capture (or (n,ch.p.) for light nuclei), elastic scattering (or total for some actinides), inelastic scattering, (n,2n) reactions, fission and nubars over the energy range from 10(-5{super}) eV to 20 MeV. The library contains 387 files including almost all (383 out of 393) materials of the ENDF/B-VII.0. Absent are data for (7{super})Li, (232{super})Th, (233,235,238{super})U and (239{super})Pu as well as (223,224,225,226{super})Ra, while (nat{super})Zn is replaced by (64,66,67,68,70{super})Zn."[http://www.nndc.bnl.gov/lowfi/index.jsp?z=7
Application of Covariances to Fast Reactor Core Analysis
Ishikawa, M. [Japan Atomic Energy Agency (JAEA), O-arai, Ibaraki, 311-1393 (Japan)], E-mail: ishikawa.makoto@jaea.go.jp
2008-12-15T23:59:59.000Z
In the present paper, the current status of covariance applications to fast reactor analysis and design is summarized with actual examples. The covariance applications are classified into three fields. First, covariances are used to quantify the uncertainty of nuclear core parameters such as criticality, control rod worth, reaction rate ratio, power distribution, sodium void reactivity, etc. The special features of the Japanese case are to include both the burnup-related parameters such as burnup reactivity loss or fuel composition changes, and the temperature-related parameter, that is, the Doppler reactivity. Second, covariances are used to select the important nuclides, reactions and energy ranges which are dominant to the uncertainty of core parameters, and to give nuclear scientists recommendations to improve the accuracy of the data. Finally, covariances are used to improve the accuracy of core design values by adopting the integral data such as the critical experiments and the power reactor operation data. The way toward improvement is classified into the conventional E/C (Experiment/Calculation) bias method and the more comprehensive cross section adjustment based on the Bayesian theorem and the generalized least square method. In Japan, an adjusted group-constant set, ADJ2000R, is now being used in the design work for future fast reactors.
Evaluation of Covariances for Actinides and Light Elements at LANL
Kawano, T. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)], E-mail: kawano@lanl.gov; Talou, P.; Young, P.G.; Hale, G.; Chadwick, M.B.; Little, R.C. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
2008-12-15T23:59:59.000Z
Los Alamos evaluates covariances for the evaluated nuclear data library (ENDF), mainly for actinides above the resonance region and for light elements in the entire energy range. We also develop techniques to evaluate the covariance data, like Bayesian and least-squares fitting methods, which are important to explore the uncertainty information on different types of physical quantities such as elastic scattering angular distribution, or prompt neutron fission spectra. This paper summarizes our current activities of the covariance evaluation work at LANL, including the actinide and light element data mainly for criticality safety studies and transmutation technology. The Bayesian method based on the Kalman filter technique, which combines uncertainties in the theoretical model and experimental data, is discussed.
Addressing spectroscopic quality of covariant density functional theory
A. V. Afanasjev
2014-09-17T23:59:59.000Z
The spectroscopic quality of covariant density functional theory has been accessed by analyzing the accuracy and theoretical uncertainties in the description of spectroscopic observables. Such analysis is first presented for the energies of the single-particle states in spherical and deformed nuclei. It is also shown that the inclusion of particle-vibration coupling improves the description of the energies of predominantly single-particle states in medium and heavy-mass spherical nuclei. However, the remaining differences between theory and experiment clearly indicate missing physics and missing terms in covariant energy density functionals. The uncertainties in the predictions of the position of two-neutron drip line sensitively depend on the uncertainties in the prediction of the energies of the single-particle states. On the other hand, many spectroscopic observables in well deformed nuclei at ground state and finite spin only weakly depend on the choice of covariant energy density functional.
Neutron Cross Section Covariances for Structural Materials and Fission Products
Hoblit, S.; Hoblit,S.; Cho,Y.-S.; Herman,M.; Mattoon,C.M.; Mughabghab,S.F.; Oblozinsky,P.; Pigni,M.T.; Sonzogni,A.A.
2011-12-01T23:59:59.000Z
We describe neutron cross section covariances for 78 structural materials and fission products produced for the new US evaluated nuclear reaction library ENDF/B-VII.1. Neutron incident energies cover full range from 10{sup -5} eV to 20 MeV and covariances are primarily provided for capture, elastic and inelastic scattering as well as (n,2n). The list of materials follows priorities defined by the Advanced Fuel Cycle Initiative, the major application being data adjustment for advanced fast reactor systems. Thus, in addition to 28 structural materials and 49 fission products, the list includes also {sup 23}Na which is important fast reactor coolant. Due to extensive amount of materials, we adopted a variety of methodologies depending on the priority of a specific material. In the resolved resonance region we primarily used resonance parameter uncertainties given in Atlas of Neutron Resonances and either applied the kernel approximation to propagate these uncertainties into cross section uncertainties or resorted to simplified estimates based on integral quantities. For several priority materials we adopted MF32 covariances produced by SAMMY at ORNL, modified by us by adding MF33 covariances to account for systematic uncertainties. In the fast neutron region we resorted to three methods. The most sophisticated was EMPIRE-KALMAN method which combines experimental data from EXFOR library with nuclear reaction modeling and least-squares fitting. The two other methods used simplified estimates, either based on the propagation of nuclear reaction model parameter uncertainties or on a dispersion analysis of central cross section values in recent evaluated data files. All covariances were subject to quality assurance procedures adopted recently by CSEWG. In addition, tools were developed to allow inspection of processed covariances and computed integral quantities, and for comparing these values to data from the Atlas and the astrophysics database KADoNiS.
Neutron Resonance Parameters and Covariance Matrix of 239Pu
Derrien, Herve [ORNL; Leal, Luiz C [ORNL; Larson, Nancy M [ORNL
2008-08-01T23:59:59.000Z
In order to obtain the resonance parameters in a single energy range and the corresponding covariance matrix, a reevaluation of 239Pu was performed with the code SAMMY. The most recent experimental data were analyzed or reanalyzed in the energy range thermal to 2.5 keV. The normalization of the fission cross section data was reconsidered by taking into account the most recent measurements of Weston et al. and Wagemans et al. A full resonance parameter covariance matrix was generated. The method used to obtain realistic uncertainties on the average cross section calculated by SAMMY or other processing codes was examined.
DESIGNING A KALMAN FILTER WHEN NO NOISE COVARIANCE INFORMATION IS
Van den Hof, Paul
DESIGNING A KALMAN FILTER WHEN NO NOISE COVARIANCE INFORMATION IS AVAILABLE Robert Bos ,1 Xavier Kalman filters using first principles models is often that these models lack a description of the noises that affect the states and the measurements. In these cases, the Kalman filter has to be estimated from data
Genetic and environmental effects on the covariation between colour polymorphism
Alvarez, Nadir
Genetic and environmental effects on the covariation between colour polymorphism and a life is under disruptive selection with each morph being adapted to specific environmental factors that can. For example, pale and melanistic morphs may absorb varying amounts of solar radiation (Berry and Willmer, 1986
Covariance matrices for use in criticality safety predictability studies
Derrien, H.; Larson, N.M.; Leal, L.C.
1997-09-01T23:59:59.000Z
Criticality predictability applications require as input the best available information on fissile and other nuclides. In recent years important work has been performed in the analysis of neutron transmission and cross-section data for fissile nuclei in the resonance region by using the computer code SAMMY. The code uses Bayes method (a form of generalized least squares) for sequential analyses of several sets of experimental data. Values for Reich-Moore resonance parameters, their covariances, and the derivatives with respect to the adjusted parameters (data sensitivities) are obtained. In general, the parameter file contains several thousand values and the dimension of the covariance matrices is correspondingly large. These matrices are not reported in the current evaluated data files due to their large dimensions and to the inadequacy of the file formats. The present work has two goals: the first is to calculate the covariances of group-averaged cross sections from the covariance files generated by SAMMY, because these can be more readily utilized in criticality predictability calculations. The second goal is to propose a more practical interface between SAMMY and the evaluated files. Examples are given for {sup 235}U in the popular 199- and 238-group structures, using the latest ORNL evaluation of the {sup 235}U resonance parameters.
Brief Genetics Report Distinguishing Covariation From Causation in Diabetes
Yandell, Brian S.
Brief Genetics Report Distinguishing Covariation From Causation in Diabetes A Lesson From-induced diabetes. We found that Pdi mRNA is 20-fold more abundant in the diabetes-susceptible BTBR mouse strain relative to the diabetes-resistant C56BL/6 (B6) strain. A genetic analysis was carried out to determine
Common Component Analysis for Multiple Covariance Matrices Huahua Wang
Boley, Daniel
as on two real stock market datasets, where major financial events can be visualized in low dimensions while preserving as much of the "energy" or variance as possible. The problem can be solved if the covariance matrices span different subspaces. Exam- ples include stock market data where financial shocks
Covariant Lyapunov Vectors for Rigid Disk Systems Hadrien Bosetti
Posch, Harald A.
Covariant Lyapunov Vectors for Rigid Disk Systems Hadrien Bosetti and Harald A. Posch Computational: October 17, 2010) We carry out extensive computer simulations to study the Lyapunov instability of a two enough to allow the formation of Lyapunov modes parallel to the x-axis of the box. The Oseledec splitting
Manufacturing time operators: Covariance, selection criteria, and examples
Hegerfeldt, G. C. [Institut fuer Theoretische Physik, Universitaet Goettingen, Friedrich-Hund-Platz 1, DE-37077 Goettingen (Germany); Muga, J. G.; Munoz, J. [Departamento de Quimica Fisica, Universidad del Pais Vasco, Apartado 644, ES-48080 Bilbao (Spain)
2010-07-15T23:59:59.000Z
We provide the most general forms of covariant and normalized time operators and their probability densities, with applications to quantum clocks, the time of arrival, and Lyapunov quantum operators. Examples are discussed of the profusion of possible operators and their physical meaning. Criteria to define unique, optimal operators for specific cases are given.
NOAA Technical Memorandum ERL GLERL-85 COVARIANCE PROPERTIES OF ANNUAL NET BASIN SUPPLIES
NOAA Technical Memorandum ERL GLERL-85 COVARIANCE PROPERTIES OF ANNUAL NET BASIN SUPPLIES ........................................................................................................ 2 2.2 Net Basin Supplies . . . . . . . . . . . 4 Table lb.--Lag-Zero Cross Covariances and Cross Correlations Among Great Lakes Annual Connecting
Jozef Klacka
2002-01-07T23:59:59.000Z
Relativistically covariant form of equation of motion for real particle (body) under the action of electromagnetic radiation is derived. Equation of motion in the proper frame of the particle uses the radiation pressure cross section 3 $\\times$ 3 matrix. Obtained covariant equation of motion is compared with another covariant equation of motion which was presented more than one year ago.
Targeting the optimal design in randomized clinical trials with binary outcomes and no covariate
Paris-Sud XI, Université de
Targeting the optimal design in randomized clinical trials with binary outcomes and no covariate of randomized clinical trials with binary treatment, binary outcome and no covariate. By adaptive design, we designs in the case of randomized clinical trials with binary treatment, binary outcome and no covariate
Lorentz covariant field theory on noncommutative spacetime based on DFR algebra
Yoshitaka Okumura
2003-11-05T23:59:59.000Z
Lorentz covariance is the fundamental principle of every relativistic field theory which insures consistent physical descriptions. Even if the space-time is noncommutative, field theories on it should keep Lorentz covariance. In this letter, it is shown that the field theory on noncommutative spacetime is Lorentz covariant if the noncommutativity emerges from the algebra of spacetime operators described by Doplicher, Fredenhagen and Roberts.
Covariant Star Product for Exterior Differential Forms on Symplectic Manifolds
McCurdy, Shannon; Zumino, Bruno [Physics Department, University of California, Berkeley, CA 94720-7300 (United States); Theoretical Physics Group, Lawrence Berkeley Laboratory, Berkeley, CA 947208162 (United States)
2010-02-10T23:59:59.000Z
After a brief description of the Z-graded differential Poisson algebra, we introduce a covariant star product for exterior differential forms and give an explicit expression for it up to second order in the deformation parameter h, in the case of symplectic manifolds. The graded differential Poisson algebra endows the manifold with a connection, not necessarily torsion-free, and places upon the connection various constraints.
Bilinear covariants and spinor fields duality in quantum Clifford algebras
Ab?amowicz, Rafa?, E-mail: rablamowicz@tntech.edu [Department of Mathematics, Box 5054, Tennessee Technological University, Cookeville, Tennessee 38505 (United States); Gonçalves, Icaro, E-mail: icaro.goncalves@ufabc.edu.br [Instituto de Matemática e Estatística, Universidade de São Paulo, Rua do Matão, 1010, 05508-090, São Paulo, SP (Brazil); Centro de Matemática, Computação e Cognição, Universidade Federal do ABC, 09210-170 Santo André, SP (Brazil); Rocha, Roldão da, E-mail: roldao.rocha@ufabc.edu.br [Centro de Matemática, Computação e Cognição, Universidade Federal do ABC, 09210-170 Santo André, SP (Brazil); International School for Advanced Studies (SISSA), Via Bonomea 265, 34136 Trieste (Italy)
2014-10-15T23:59:59.000Z
Classification of quantum spinor fields according to quantum bilinear covariants is introduced in a context of quantum Clifford algebras on Minkowski spacetime. Once the bilinear covariants are expressed in terms of algebraic spinor fields, the duality between spinor and quantum spinor fields can be discussed. Thus, by endowing the underlying spacetime with an arbitrary bilinear form with an antisymmetric part in addition to a symmetric spacetime metric, quantum algebraic spinor fields and deformed bilinear covariants can be constructed. They are thus compared to the classical (non quantum) ones. Classes of quantum spinor fields classes are introduced and compared with Lounesto's spinor field classification. A physical interpretation of the deformed parts and the underlying Z-grading is proposed. The existence of an arbitrary bilinear form endowing the spacetime already has been explored in the literature in the context of quantum gravity [S. W. Hawking, “The unpredictability of quantum gravity,” Commun. Math. Phys. 87, 395 (1982)]. Here, it is shown further to play a prominent role in the structure of Dirac, Weyl, and Majorana spinor fields, besides the most general flagpoles and flag-dipoles. We introduce a new duality between the standard and the quantum spinor fields, by showing that when Clifford algebras over vector spaces endowed with an arbitrary bilinear form are taken into account, a mixture among the classes does occur. Consequently, novel features regarding the spinor fields can be derived.
Nuclear response theory with multiphonon coupling in a covariant framework
Elena Litvinova
2015-04-13T23:59:59.000Z
Background: Nuclear excited states within a wide range of excitation energies are formally described by the linear response theory. Besides its conventional formulation within the quasiparticle random phase approximation (QRPA) representing excited states as two correlated quasiparticles (2q), there exist extensions for 4q configurations. Such extended approaches are quite successful in the description of gross properties of nuclear spectra, however, accounting for many of their fine features requires further extension of the configuration space. Purpose: This work aims at the development of an approach which is capable of such an extension as well as of reproducing and predicting fine spectral properties, which are of special interest at low energies. Method: The method is based on the covariant density functional theory and time blocking approximation, which is extended for couplings between quasiparticles and multiphonon excitations. Results: The covariant multiphonon response theory is developed and adopted for nuclear structure calculations in medium-mass and heavy nuclei. The equations are formulated in both general and coupled forms in the spherical basis. Conclusions: The developed covariant multiphonon response theory represents a new generation of the approaches to nuclear response, which aims at a unified description of both high-frequency collective states and low-energy spectroscopy in medium-mass and heavy nuclei.
Covariant cosmological perturbation dynamics in the inflationary universe
Winfried Zimdahl
1998-06-09T23:59:59.000Z
The linear cosmological perturbation theory of almost homogeneous and isotropic perfect fluid and scalar field universes is reconsidered and formally simplified. Using the existence of a covariant conserved quantity on large perturbation scales, a closed integral expression for comoving energy density perturbations is obtained for arbitrary equations of state. On this basis we establish a simple relation between fluid energy density perturbations at `reentry' into the horizon and the corresponding scalar field quantities at the first Hubble scale crossing during an early de Sitter phase of a standard inflationary scenario.
Lorentz covariance and gauge invariance in the proton spin problem
S. C. Tiwari
2014-09-01T23:59:59.000Z
In this brief note insightful remarks are made on the controversy on the decomposition of the proton spin into the spin and orbital angular momenta of quarks and gluons. It is argued that the difference in the perception on the nature of the problem is the main reason for the persistent disputes. There is no decomposition that simultaneously satisfies the twin principles of manifest Lorentz covariance and gauge invariance, and partial considerations hide likely inconsistencies. It is suggested that field equations and matter (i. e. electron in QED and quarks in QCD) equations must be analyzed afresh rather than beginning with the expressions of total angular momentum; canonical or otherwise.
Light propagation in generally covariant electrodynamics and the Fresnel equation
Friedrich W. Hehl; Yuri N. Obukhov; Guillermo F. Rubilar
2002-03-28T23:59:59.000Z
Within the framework of generally covariant (pre-metric) electrodynamics, we specify a local vacuum spacetime relation between the excitation $H=({\\cal D},{\\cal H})$ and the field strength $F=(E,B)$. We study the propagation of electromagnetic waves in such a spacetime by Hadamard's method and arrive, with the constitutive tensor density $\\kappa\\sim\\partial H/\\partial F$, at a Fresnel equation which is algebraic of 4th order in the wave covector. We determine how the different pieces of $\\kappa$, in particular the axion and the skewon pieces, affect the propagation of light.
Lyman Alpha Flux Power Spectrum and Its Covariance
Hu Zhan; Romeel Dave; Daniel Eisenstein; Neal Katz
2005-08-10T23:59:59.000Z
We analyze the flux power spectrum and its covariance using simulated Lyman alpha forests. We find that pseudo-hydro techniques are good approximations of hydrodynamical simulations at high redshift. However, the pseudo-hydro techniques fail at low redshift because they are insufficient for characterizing some components of the low-redshift intergalactic medium, notably the warm-hot intergalactic medium. Hence, to use the low-redshift Lyman alpha flux power spectrum to constrain cosmology, one would need realistic hydrodynamical simulations. By comparing one-dimensional mass statistics with flux statistics, we show that the nonlinear transform between density and flux quenches the fluctuations so that the flux power spectrum is much less sensitive to cosmological parameters than the one-dimensional mass power spectrum. The covariance of the flux power spectrum is nearly Gaussian. As such, the uncertainties of the underlying mass power spectrum could still be large, even though the flux power spectrum can be precisely determined from a small number of lines of sight.
A covariant model for the nucleon spin structure
Ramalho, G
2015-01-01T23:59:59.000Z
We present the results of the covariant spectator quark model applied to the nucleon structure function $f(x)$ measured in unpolarized deep inelastic scattering, and the structure functions $g_1(x)$ and $g_2(x)$ measured in deep inelastic scattering using polarized beams and targets ($x$ is the Bjorken scaling variable). The nucleon is modeled by a valence quark-diquark structure with $S,P$ and $D$ components. The shape of the wave functions and the relative strength of each component are fixed by making fits to the deep inelastic scattering data for the structure functions $f(x)$ and $g_1(x)$. The model is then used to make predictions on the function $g_2(x)$ for the proton and neutron.
Chiral symmetry and ? - ? scattering in the covariant spectator theory
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Biernat, Elmar P; Pena, M. T.; Ribeiro, J. E.; Stadler, Alfred; Gross, Franz
2014-11-01T23:59:59.000Z
The ? - ? scattering amplitude calculated with a model for the quark-antiquark interaction in the framework of the Covariant Spectator Theory (CST) is shown to satisfy the Adler zero constraint imposed by chiral symmetry. The CST formalism is established in Minkowski space and our calculations are performed in momentum space. We prove that the axial-vector Ward-Takahashi identity is satisfied by our model. Then we show that, similarly to what happens within the Bethe-Salpeter formalism, application of the axial-vector Ward Takahashi identity to the CST ? - ? scattering amplitude allows us to sum the intermediate quark-quark interactions to all orders. The Adler self-consistency zero for ? - ? scattering in the chiral limit emerges as the result for this sum.
Chiral symmetry and ? - ? scattering in the covariant spectator theory
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Biernat, Elmar P; Pena, M. T.; Ribeiro, J. E.; Stadler, Alfred; Gross, Franz
2014-11-01T23:59:59.000Z
The ? - ? scattering amplitude calculated with a model for the quark-antiquark interaction in the framework of the Covariant Spectator Theory (CST) is shown to satisfy the Adler zero constraint imposed by chiral symmetry. The CST formalism is established in Minkowski space and our calculations are performed in momentum space. We prove that the axial-vector Ward-Takahashi identity is satisfied by our model. Then we show that, similarly to what happens within the Bethe-Salpeter formalism, application of the axial-vector Ward Takahashi identity to the CST ? - ? scattering amplitude allows us to sum the intermediate quark-quark interactions to allmore »orders. The Adler self-consistency zero for ? - ? scattering in the chiral limit emerges as the result for this sum.« less
Optimized Cascade of Classifiers for People Detection Using Covariance Malik SOUDED1,2
Paris-Sud XI, UniversitÃ© de
for many applications like people track- ing especially in crowded scenes has motivated many researchesOptimized Cascade of Classifiers for People Detection Using Covariance Features Malik SOUDED1.Souded@digitalbarriers.com Keywords: People detection, Covariance descriptor, LogitBoost. Abstract: People detection on static images
Spectra of empirical auto-covariance matrices R. Kuhn and P. Sollich
Kühn, Reimer
densities of large sample auto-covariance matrices of stationary stochastic processes at fixed ratio = N the properties of sta- tionary stochastic processes [1], one typically begins by concentrating on low the latter further consists in looking at the auto-covariance matrix obtained by sam- pling the auto
Computer representation of the model covariance function resulting from travel-time tomography
Cerveny, Vlastislav
Computer representation of the model covariance function resulting from travel-time tomography Lud a supplement to the paper by Klime#20;s (2002b) on the stochastic travel{time tomography. It contains brief covariance function is a function of 6 coordinates with pro- nounced singularities. The computer
WEAK SIGNAL DETECTION IN HYPERSPECTRAL IMAGERY USING SPARSE MATRIX TRANSFORM (SMT) COVARIANCE. In this paper, we describe the sparse matrix transform (SMT) and investigate its utility for estimating the covariance matrix from a limited number ofsamples. The SMT is formed by a product of pairwise coordinate
Covariant Lyapunov vectors for rigid disk systems Hadrien Bosetti, Harald A. Posch *
Dellago, Christoph
Covariant Lyapunov vectors for rigid disk systems Hadrien Bosetti, Harald A. Posch * Computational l e i n f o Article history: Available online 10 June 2010 Keywords: Lyapunov instability Hard disks Covariant vectors Statistical mechanics Computer simulation Fluids Lyapunov modes a b s t r a c t We carry
Covariant Lyapunov vectors and local exponents Harald A. Posch and Hadrien Bosetti
Posch, Harald A.
Covariant Lyapunov vectors and local exponents Harald A. Posch and Hadrien Bosetti Faculty the perturbation vectors in tangent space and the associated local Lyapunov exponents. We also find that the local covariant exponents vary discontinuously along directions transverse to the phase flow. Keywords: Lyapunov
Covariance of cross-correlations: towards efficient measures for large-scale structure
Robert E. Smith
2009-06-13T23:59:59.000Z
We study the covariance of the cross-power spectrum of different tracers for the large-scale structure. We develop the counts-in-cells framework for the multi-tracer approach, and use this to derive expressions for the full non-Gaussian covariance matrix. We show, that for the usual auto-power statistic, besides the off-diagonal covariance generated through gravitational mode-coupling, the discreteness of the tracers and their associated sampling distribution can generate strong off-diagonal covariance, and that this becomes the dominant source of covariance as k>>k_f=2 pi/L. On comparison with the derived expressions for the cross-power covariance, we show that the off-diagonal terms can be suppressed, if one cross-correlates a high tracer-density sample with a low one. Taking the effective estimator efficiency to be proportional to the signal-to-noise ratio (SN), we show that, to probe clustering as a function of physical properties of the sample, i.e. cluster mass or galaxy luminosity, then the cross-power approach can out perform the auto-power one by factors of a few. We confront the theory with measurements of the mass-mass, halo-mass, and halo-halo power spectra from a large ensemble of N-body simulations. We show that there is a significant SN advantage to be gained from using the cross-power approach when studying the bias of rare haloes. The analysis is repeated in configuration space and again SN improvement is found. We estimate the covariance matrix for these samples, and find strong off-diagonal contributions. The covariance depends on halo mass, with higher mass samples having stronger covariance. In agreement with theory, we show that the covariance is suppressed for the cross-power. This work points the way towards improved estimators for clustering studies.
Covariance Matrix of a Double-Differential Doppler-broadened Elastic Scattering Cross Section
Arbanas, Goran [ORNL; Becker, B. [Rensselaer Polytechnic Institute (RPI); Dagan, R [Institut fur Neutronenphysik und Reaktortechnik; Dunn, Michael E [ORNL; Larson, Nancy M [ORNL; Leal, Luiz C [ORNL; Williams, Mark L [ORNL
2012-01-01T23:59:59.000Z
Legendre moments of a double-differential Doppler-broadened elastic neutron scattering cross section on {sup 238}U are computed near the 6.67 eV resonance at temperature T = 10{sup 3} K up to angular order 14. A covariance matrix of these Legendre moments is computed as a functional of the covariance matrix of the elastic scattering cross section. A variance of double-differential Doppler-broadened elastic scattering cross section is computed from the covariance of Legendre moments.
Covariant Spectator Theory of np scattering: Isoscalar interaction currents
Gross, Franz L. [JLAB
2014-06-01T23:59:59.000Z
Using the Covariant Spectator Theory (CST), one boson exchange (OBE) models have been found that give precision fits to low energy $np$ scattering and the deuteron binding energy. The boson-nucleon vertices used in these models contain a momentum dependence that requires a new class of interaction currents for use with electromagnetic interactions. Current conservation requires that these new interaction currents satisfy a two-body Ward-Takahashi (WT), and using principals of {\\it simplicity\\/} and {\\it picture independence\\/}, these currents can be uniquely determined. The results lead to general formulae for a two-body current that can be expressed in terms of relativistic $np$ wave functions, ${\\it \\Psi}$, and two convenient truncated wave functions, ${\\it \\Psi}^{(2)}$ and $\\widehat {\\it \\Psi}$, which contain all of the information needed for the explicit evaluation of the contributions from the interaction current. These three wave functions can be calculated from the CST bound or scattering state equations (and their off-shell extrapolations). A companion paper uses this formalism to evaluate the deuteron magnetic moment.
On Covariant Poisson Brackets in Classical Field Theory
Michael Forger; Mário O. Salles
2015-01-15T23:59:59.000Z
How to give a natural geometric definition of a covariant Poisson bracket in classical field theory has for a long time been an open problem - as testified by the extensive literature on "multisymplectic Poisson brackets", together with the fact that all these proposals suffer from serious defects. On the other hand, the functional approach does provide a good candidate which has come to be known as the Peierls - De Witt bracket and whose construction in a geometrical setting is now well understood. Here, we show how the basic "multisymplectic Poisson bracket" already proposed in the 1970s can be derived from the Peierls - De Witt bracket, applied to a special class of functionals. This relation allows to trace back most (if not all) of the problems encountered in the past to ambiguities (the relation between differential forms on multiphase space and the functionals they define is not one-to-one) and also to the fact that this class of functionals does not form a Poisson subalgebra.
Effective Action and Hawking Flux from Covariant Perturbation Theory
D. Hofmann; W. Kummer
2004-08-26T23:59:59.000Z
The computation of the radiation flux related to the Hawking temperature of a Schwarzschild Black Hole or another geometric background is still well-known to be fraught with a number of delicate problems. In spherical reduction, as shown by one of the present authors (W. K.) with D.V. Vassilevich, the correct black body radiation follows when two ``basic components'' (conformal anomaly and a ``dilaton'' anomaly) are used as input in the integrated energy-momentum conservation equation. The main new element in the present work is the use of a quite different method, the covariant perturbation theory of Barvinsky and Vilkovisky, to establish directly the full effective action which determines these basic components. In the derivation of W. K. and D.V. Vassilevich the computation of the dilaton anomaly implied one potentially doubtful intermediate step which can be avoided here. Moreover, the present approach also is sensitive to IR (renormalisation) effects. We realize that the effective action naturally leads to expectation values in the Boulware vacuum which, making use of the conservation equation, suffice for the computation of the Hawking flux in other quantum states, in particular for the relevant Unruh state. Thus, a rather comprehensive discussion of the effects of (UV and IR) renormalisation upon radiation flux and energy density is possible.
Application of Covariance Data to Criticality Safety Data Validation
Broadhead, B.L.; Hopper, C.M.; Parks, C.V.
1999-11-13T23:59:59.000Z
The use of cross-section covariance data has long been a key part of traditional sensitivity and uncertainty analyses (S/U). This paper presents the application of S/U methodologies to the data validation tasks of a criticality safety computational study. The S/U methods presented are designed to provide a formal means of establishing the area (or range) of applicability for criticality safety data validation studies. The goal of this work is to develop parameters that can be used to formally determine the ''similarity'' of a benchmark experiment (or a set of benchmark experiments individually) and the application area that is to be validated. These parameters are termed D parameters, which represent the differences by energy group of S/U-generated sensitivity profiles, and ck parameters, which are the correlation coefficients, each of which gives information relative to the similarity between pairs of selected systems. The application of a Generalized Linear Least-Squares Methodology ( GLLSM) tool to criticality safety validation tasks is also described in this paper. These methods and guidelines are also applied to a sample validation for uranium systems with enrichments greater than 5 wt %.
Covariant Spectator Theory of np scattering: Isoscalar interaction currents
Franz Gross
2014-04-06T23:59:59.000Z
Using the Covariant Spectator Theory (CST), one boson exchange (OBE) models have been found that give precision fits to low energy np scattering and the deuteron binding energy. The boson-nucleon vertices used in these models contain a momentum dependence that requires a new class of interaction currents for use with electromagnetic interactions. Current conservation requires that these new interaction currents satisfy a two-body Ward-Takahashi identity, and using principals of simplicity and picture independence, these currents can be uniquely determined. The results lead to general formulae for a two-body current that can be expressed in terms of relativistic np wave functions, Psi, and two convenient truncated wave functions, ${\\it \\Psi}^{(2)}$ and $\\widehat {\\it \\Psi}$, which contain all of the information needed for the explicit evaluation of the contributions from the interaction current. These three wave functions can be calculated from the CST bound or scattering state equations (and their off-shell extrapolations). A companion paper uses this formalism to evaluate the deuteron magnetic moment.
July 20, 2001; rev. August 16, 2001 General Covariance, Gauge Theories and the Kretschmann
1 July 20, 2001; rev. August 16, 2001 General Covariance, Gauge Theories and the Kretschmann of Parma, June 21-23, 2001, organized by Massimo Pauri. #12;2 1. Introduction Two views... When Einstein
Eddy covariance flux measurements of pollutant gases in urban Mexico City
Velasco, Erik
Eddy covariance (EC) flux measurements of the atmosphere/surface exchange of gases over an urban area are a direct way to improve and evaluate emissions inventories, and, in turn, to better understand urban atmospheric ...
EXTENSIVE SET OF LOW-FIDELITY COVARIANCES IN FAST NEUTRON REGION.
PIGNI,M.T.; HERMAN, M.; OBLOZINSKY, P.; ROCHMAN, D.
2007-07-30T23:59:59.000Z
An extensive set of covariances for neutron cross sections has been developed to provide initial, low-fidelity but consistent uncertainty data for nuclear criticality safety applications. The methodology for the determination of such covariances in fast neutron region is presented. It combines the nuclear reaction code EMPIRE, which calculates sensitivity to nuclear reaction model parameters and the Bayesian code KALMAN to propagate uncertainty of the model parameters onto cross sections. Taking into account the large scale of the project (219 fission products), only partial reference to experimental data has been made. Therefore, the covariances are, to a large extent, derived from the perturbation of several critical model parameters selected through the sensitivity analysis. They define optical potential, level densities and pre-equilibrium emission. This exercise represents the first attempt to generate nuclear data covariances on such a scale.
Brain covariance selection: better individual functional connectivity models using population prior
Paris-Sud XI, Université de
Brain covariance selection: better individual functional connectivity models using population prior bertrand.thirion@inria.fr Abstract Spontaneous brain activity, as observed in functional neuroimaging, has been shown to display reproducible structure that expresses brain architecture and car- ries markers
Applications of nuclear data covariances to criticality safety and spent fuel characterization
Williams, Mark L [ORNL] [ORNL; Ilas, Germina [ORNL] [ORNL; Marshall, William BJ J [ORNL] [ORNL; Rearden, Bradley T [ORNL] [ORNL
2014-01-01T23:59:59.000Z
Covariance data computational methods and data used for sensitivity and uncertainty analysis within the SCALE nuclear analysis code system are presented. Applications in criticality safety calculations and used nuclear fuel analysis are discussed.
Journal of Multivariate Analysis 92 (2005) 186204 Covariate selection for semiparametric hazard
McKeague, Ian
partial likelihood--henceforth PPL [16], a backwards elimination covariate selection method [9], Bayesian model averaging [14,15], Bayesian variable selection [8], the lasso method for PPL [17], and nonconcave PPL [7]. Large sample
An analysis of Texas rainfall data and asymptotic properties of space-time covariance estimators
Li, Bo
2009-06-02T23:59:59.000Z
This dissertation includes two parts. Part 1 develops a geostatistical method to calibrate Texas NexRad rainfall estimates using rain gauge measurements. Part 2 explores the asymptotic joint distribution of sample space-time covariance estimators...
Econometrica, Vol. 72, No. 3 (May, 2004), 885925 ECONOMETRIC ANALYSIS OF REALIZED COVARIATION: HIGH
Wolfe, Patrick J.
Econometrica, Vol. 72, No. 3 (May, 2004), 885925 ECONOMETRIC ANALYSIS OF REALIZED COVARIATION by the UK's ESRC through the grant "High Frequency Financial Econometrics Based upon Power Variation." All
Covariant Schwarzschild perturbations I: Initial value formulation for scalars of spin-weight -+ 2
R. B. Burston; A. W. C. Lun
2006-11-08T23:59:59.000Z
We consider full perturbations to a covariantly defined Schwarzschild spacetime. By constructing complex quantities, we derive two decoupled, covariant and gauge-invariant, wave-like equations for spin-weighted scalars. These arise naturally from the Bianchi identities and comprise a covariant representation of the Bardeen-Press equations for scalars with spin-weight $\\pm2$. Furthermore, the covariant and gauge-invariant 1+1+2 formalism is employed, and consequently, the physical interpretation of the energy-momentum perturbations is transparent. They are written explicitly in terms of the energy-momentum specified on spacelike three-slices. Ultimately, a Cauchy problem is constructed whereby, an initial three-slice may be perturbed by an energy-momentum source, which induces resultant gravitational fields.
, which we refer to as dynamic covariate information. For example, even a small device like a power inverter that are used in solar panel arrays can gather and transmit information on the output of power
The manifestly covariant Aharonov-Bohm effect in terms of the 4D fields
Tomislav Ivezic
2014-11-21T23:59:59.000Z
In this paper it is presented a manifestly covariant formulation of the Aharonov-Bohm (AB) phase difference for the magnetic AB effect . This covariant AB phase is written in terms of the Faraday 2-form F and using the decomposition of F in terms of the electric and magnetic fields as four-dimensional (4D) geometric quantities. It is shown that there is a static electric field outside a stationary solenoid with resistive conductor carrying steady current, which causes that the AB phase difference in the magnetic AB effect may be determined by the electric part of the covariant expression, i.e. by the local influence of the 4D electric field and not, as generally accepted,in terms of nonzero vector potential.
PRELIMINARY CROSS SECTION AND NU-BAR COVARIANCES FOR WPEC SUBGROUP 26
ROCHMAN,D.
2007-01-31T23:59:59.000Z
We report preliminary cross section covariances developed for the WPEC Subgroup 26 for 45 out of 52 requested materials. The covariances were produced in 15- and 187-group representations as follows: (1) 36 isotopes ({sup 16}O, {sup 19}F, {sup 23}Na, {sup 27}Al, {sup 28}Si, {sup 52}Cr, {sup 56,56}Fe, {sup 58}Ni, {sup 90,91,92,94}Zr, {sup 166,167,168,170}Er, {sup 206,207,208}Pb, {sup 209}Bi, {sup 233,234,236}U, {sup 237}Np, {sup 238,240,241,242}Pu, {sup 241,242m,243}Am, {sup 242,243,244,245}Cm) were evaluated using the BNL-LANL methodology. For the thermal region and the resolved and unresolved resonance regions, the methodology has been based on the Atlas-Kalman approach, in the fast neutron region the Empire-Kalman method has been used; (2) 6 isotopes ({sup 155,156,157,158,160}Gd and {sup 232}Th) were taken from ENDF/B-VII.0; and (3) 3 isotopes ({sup 1}H, {sup 238}U and {sup 239}Pu) were taken from JENDL-3.3. For 6 light nuclei ({sup 4}He, {sup 6,7}Li, {sup 9}Be, {sup 10}B, {sup 12}C), only partial cross section covariance results were obtained, additional work is needed and they do not report the results here. Likewise, the cross section covariances for {sup 235}U, which they recommend to take from JENDL-3.3, will be included once the multigroup processing is successfully completed. Covariances for the average number of neutrons per fission, total {nu}-bar, are provided for 10 actinides identified as priority by SG26. Further work is needed to resolve some of the issues and to produce covariances for the full set of 52 materials.
Covariance analysis of finite temperature density functional theory: symmetric nuclear matter
A. Rios; X. Roca-Maza
2014-08-21T23:59:59.000Z
We study symmetric nuclear matter at finite temperature, with particular emphasis on the liquid-gas phase transition. We use a standard covariance analysis to propagate statistical uncertainties from the density functional to the thermodynamic properties. We use four functionals with known covariance matrices to obtain as wide a set of results as possible. Our findings suggest that thermodynamical properties are very well constrained by fitting data at zero temperature. The propagated statistical errors in the liquid-gas phase transition parameters are relatively small.
V. Pelykh
2004-08-18T23:59:59.000Z
The elliptic system of equations, which is general-covariant and locally SU(2)-covariant, is investigated. The new condition of the Dirichlet problem solvability and the condition of zeros absence for solutions are obtained for this system, which contains in particular case the Sen-Witten equation. On this basis it is proved the existence of the wide class of hypersurfaces, in all points of which there exists a correspondence between the Sen-Witten spinor field and three-frame, which generalizes the Nester orthoframe. The Nester special orthoframe also exists on a certain subclass containing not only the maximal hypersurfaces.
Nanjing, July 26, 2008 Defeng Sun 1 Calibrating Least Squares Covariance Matrix Problems
Sun, Defeng
Nanjing, July 26, 2008 Defeng Sun 1 ' & $ % Calibrating Least Squares Covariance Matrix Problems with Equality and Inequality Constraints Defeng Sun Department of Mathematics National University of Singapore to Professor Bingsheng He #12;Nanjing, July 26, 2008 Defeng Sun 2 ' & $ % Let Sn be the set of all real
A Nonparametric Matching Method for Covariate Adjustment with Application to Economic Evaluation
Sekhon, Jasjeet S.
A Nonparametric Matching Method for Covariate Adjustment with Application to Economic Evaluation of propensity score and Mahalanobis distance matching. We apply Genetic Matching to an economic evaluation and nonparametric methods; observational stud- ies; health economic evaluation #12;1 Introduction Progress has been
Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net
Low, Steven H.
. Furthermore, un- like the Lasso, the Elastic Net can yield a sparse esti- mate with more than n non-zero477 Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net Alexander to regression regulariza- tion called the Pairwise Elastic Net is pro- posed. Like the Elastic Net, it simultane
Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net
Blei, David M.
, the Elastic Net can yield a sparse esti- mate with more than n non-zero weights (Efron et al., 2004). One canExploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net Alexander Lorbert- tion called the Pairwise Elastic Net is pro- posed. Like the Elastic Net, it simultane- ously performs
Conditional quantiles when the covariates are curves : an application to Ozone pollution
Bercu, Bernard
Conditional quantiles when the covariates are curves : an application to Ozone pollution forecasting Summary This work deals with the study of pollution data with the aim of forecas- ting the Ozone of the maximum of Ozone one day kno- wing one or several of these functional variables the day before. To do this
Review and Assessment of Neutron Cross Section and Nubar Covariances for Advanced Reactor Systems
Maslov,V.M.; Oblozinsky, P.; Herman, M.
2008-12-01T23:59:59.000Z
In January 2007, the National Nuclear Data Center (NNDC) produced a set of preliminary neutron covariance data for the international project 'Nuclear Data Needs for Advanced Reactor Systems'. The project was sponsored by the OECD Nuclear Energy Agency (NEA), Paris, under the Subgroup 26 of the International Working Party on Evaluation Cooperation (WPEC). These preliminary covariances are described in two recent BNL reports. The NNDC used a simplified version of the method developed by BNL and LANL that combines the recent Atlas of Neutron Resonances, the nuclear reaction model code EMPIRE and the Bayesian code KALMAN with the experimental data used as guidance. There are numerous issues involved in these estimates of covariances and it was decided to perform an independent review and assessment of these results so that better covariances can be produced for the revised version in future. Reviewed and assessed are uncertainties for fission, capture, elastic scattering, inelastic scattering and (n,2n) cross sections as well as prompt nubars for 15 minor actinides ({sup 233,234,236}U, {sup 237}Np, {sup 238,240,241,242}Pu, {sup 241,242m,243}Am and {sup 242,243,244,245}Cm) and 4 major actinides ({sup 232}Th, {sup 235,238}U and {sup 239}Pu). We examined available evaluations, performed comparison with experimental data, taken into account uncertainties in model parameterization and made use state-of-the-art nuclear reaction theory to produce the uncertainty assessment.
Brain covariance selection: better individual functional connectivity models using population prior
Brain covariance selection: better individual functional connectivity models using population prior.thirion@inria.fr Abstract Spontaneous brain activity, as observed in functional neuroimaging, has been shown to display reproducible structure that expresses brain architecture and car- ries markers of brain pathologies
Submitted to the Annals of Statistics FLEXIBLE COVARIANCE ESTIMATION IN GRAPHICAL
West, Mike
models have proven to be excellent tools for the analysis of complex high-dimensional data where examples where we explore frequentist risk prop- erties and the efficacy of graphs in the estimation of these estimators give substantial risk reductions compared to the sample covariance estimator S in small sample
Beta diversity and latitude in North American mammals: testing the hypothesis of covariation
Nacional AutÃ³noma de MÃ©xico, Universidad
Beta diversity and latitude in North American mammals: testing the hypothesis of covariation Pilar RodriÂ´guez and HeÂ´ctor T. Arita RodriÂ´guez, P. and Arita, H. T. 2004. Beta diversity and latitude of the pattern remain insufficiently explored, including the effect of scales and the role of beta diversity
Covariation of coastal water temperature and microbial pollution at interannual to tidal periods
Winant, Clinton D.
Covariation of coastal water temperature and microbial pollution at interannual to tidal periods, California, USA Daniel B. Lluch-Cota Centro de Investigaciones Biologicas del Noroeste, La Paz, Mexico-period cooling are coincident with elevated levels of microbial pollution in the surf zone. This relationship can
Multi-loop Decentralized PID Control Based on Covariance Control Criteria: an LMI Approach
Alberta, University of
Multi-loop Decentralized PID Control Based on Covariance Control Criteria: an LMI Approach Xin, Alberta, Canada T6G2G6 Abstract PID control is well known and widely applied in industry and many design PID control for multivariable processes to meet certain objectives simultaneously is still
Covariance Estimation for High Dimensional Data Vectors Using the Sparse Matrix Transform
matrix transform (SMT). The SMT is formed by a product of pairwise coordinate rotations known as Givens is limited. Experiments on standard hyperspectral data sets show that the SMT covariance estimate decomposition which can be represented as a sparse matrix transform (SMT) [8]. The SMT is formed by a product
The Sparse Matrix Transform for Covariance Estimation and Analysis of High Dimensional
to have an eigen decomposition which can be represented as a sparse matrix transform (SMT). The SMT that the SMT-based covariance estimates are consistently more accurate than both traditional shrinkage implementation of the estimated eigen-transformation using the SMT representation. In fact, the SMT can be viewed
Sabouri, P.; Bidaud, A. [Labratoire de Physique Subatomique et de Cosmologie, CNRS-IN2P3/UJF/INPG, Grenoble (France); Dabiran, S.; Buijs, A. [Dept. of Engineering Physics, McMaster Univ., Hamilton, ON (Canada)
2012-07-01T23:59:59.000Z
An alternate method for the estimation of the global uncertainty on criticality, using the total cross section and its covariances, is proposed. Application of the method with currently available covariance data leads to an unrealistically large prediction of the global uncertainty on criticality. New covariances for total cross section and individual reactions are proposed. Analysis with the proposed covariance matrices is found to result in a global uncertainty for criticality consistent with the traditional method. Recommendations are made to evaluators for providing total cross section covariances. (authors)
Cheng-Yi Sun; Yu Song; Rui-Hong Yue
2011-10-09T23:59:59.000Z
It was found that the model with interaction between cold dark matter (CDM) and dark energy (DE) proportional to the energy density of CDM $\\rho_m$ and constant equation of state of DE $w_d$ suffered from instabilities of the density perturbations on the supper-Hubble scales. Here we suggest a new covariant model for the energy-momentum transfer between CDM and DE. Then using the covariant model, we analyze the evolution of density perturbations on the supper-Hubble scale. We find that the instabilities can be avoided in the model with constant $w_d$ and interaction proportional to $\\rho_m$. Furthermore, we analyze the dominant non-adiabatic mode in the radiation era and find that the mode grows regularly.
Estimated 55Mn and 90Zr cross section covariances in the fast neutron energy region
Pigni,M.T.; Herman, M.; Oblozinsky, P.
2008-06-24T23:59:59.000Z
We completed estimates of neutron cross section covariances for {sup 55}Mn and {sup 90}Zr, from keV range to 25 MeV, considering the most important reaction channels, total, elastic, inelastic, capture, and (n,2n). The nuclear reaction model code EMPIRE was used to calculate sensitivity to model parameters by perturbation of parameters that define the optical model potential, nuclear level densities and strength of the pre-equilibrium emission. The sensitivity analysis was performed with the set of parameters which reproduces the ENDF/B-VII.0 cross sections. The experimental data were analyzed and both statistical and systematic uncertainties were extracted from almost 30 selected experiments. Then, the Bayesian code KALMAN was used to combine the sensitivity analysis and the experiments to obtain the evaluated covariance matrices.
Separation of correlated astrophysical sources using multiple-lag data covariance matrices
Bedini, L; Salerno, E; Baccigalupi, C; Kuruouglu, E E; Tonazzini, A
2004-01-01T23:59:59.000Z
This paper deals with a source separation strategy based on second-order statistics, namely, on data covariance matrices estimated at several lags. In general, ``blind'' approaches to source separation do not assume any knowledge on the mixing operator; however, any prior information about the possible structure of the mixing operator can improve the solution. Unlike ICA blind separation approaches, where mutual independence between the sources is assumed, our method only needs to constrain second-order statistics, and is effective even if the original sources are significantly correlated. Besides the mixing matrix, our strategy is also capable to evaluate the source covariance functions at several lags. Moreover, once the mixing parameters have been identified, a simple deconvolution can be used to estimate the probability density functions of the source processes. To benchmark our algorithm, we used a database that simulates the one expected from the instruments that will operate onboard ESA's Planck Survey...
A covariant variational approach to Yang-Mills Theory at finite temperatures
Markus Quandt; Hugo Reinhardt
2015-03-24T23:59:59.000Z
We extend the covariant variational approach for SU(N) Yang-Mills theory in Landau gauge to non-zero temperatures. The renormalization of the zero-temperature case is revisited and it is shown that the same counterterms are sufficient to render the low-order Green's function finite at non-zero temperature. We compute the ghost and gluon propagator numerically and show that it agrees in all qualitative respects with the results of high-precision lattice calculations.
Entropy Production and Equilibrium Conditions in General-Covariant Continuum Physics
Wolfgang Muschik; Horst-Heino v. Borzeszkowski
2015-01-03T23:59:59.000Z
Starting out with an entropy identity, the entropy flux, the entropy production and the corresponding Gibbs and Gibbs-Duhem equations of general-covariant conti\\-nuum thermodynamics are established. Non-dissipative materials and equilibria are investigated. It is proved that equilibrium conditions only put on material properties cannot generate equilibria, rather additionally, the Killing property of the 4-temperature is a necessary condition for space-times in which equilibria are possible.
0v{beta}{beta} decay: theoretical nuclear matrix elements and their covariances
Lisi, Eligio [Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Via Orabona 4, 70126 Bari (Italy)
2009-11-09T23:59:59.000Z
Within the quasiparticle random phase approximation (QRPA), the covariances associated to the nuclear matrix elements (NME) of neutrinoless double beta decay (0v{beta}{beta}) are estimated. It is shown that correlated NME uncertainties play an important role in the comparison of 0v{beta}{beta} decay rates for different nuclei, both in the standard case of light Majorana neutrino exchange, and in nonstandard physics cases.
The periodic variations of the covariance and the effect on the probability of collision
Yang, Jung-Hwa
2002-01-01T23:59:59.000Z
variation l. (0 &p: 0 ~ 05~ G&p: l cF&0: rr) QBd o'rp: rl / 10) 2. 5 x10 4 o vs Time 15 X o 1 0. 5 x10 5 3 0 0 1 2 3 time (orbit) Figure 3. 3 Simple covariance variation 2. (rr?, =1/3, rr?, =1, cr?, = J2n, and o, =1/2) 31 The out of plane...
ORNL Resolved Resonance Covariance Generation for ENDF/B-VII.1
Leal, Luiz C. [ORNL; Guber, Klaus H. [ORNL; Wiarda, Dorothea [ORNL] [ORNL; Arbanas, Goran [ORNL] [ORNL; Derrien, Herve [ORNL] [ORNL; Sayer, Royce O. [ORNL; Larson, Nancy M. [ORNL; Dunn, Michael E. [ORNL
2012-12-01T23:59:59.000Z
Resonance-parameter covariance matrix (RPCM) evaluations in the resolved resonance regionwere done at the Oak Ridge National Laboratory (ORNL) for the chromium isotopes, titanium isotopes, 19F, 58Ni, 60Ni, 35Cl, 37Cl, 39K, 41K, 55Mn, 233U, 235U, 238U, and 239Pu using the computer code SAMMY. The retroactive approach of the code SAMMY was used to generate the RPCMs for 233U. For 235U, the approach used for covariance generation was similar to the retroactive approach with the distinction that real experimental data were used as opposed to data generated from the resonance parameters. RPCMs for 238U and 239Pu were generated together with the resonance parameter evaluations. The RPCMs were then converted in the ENDF format using the FILE32 representation. Alternatively, for computer storage reasons, the FILE32 was converted in the FILE33 cross section covariance matrix (CSCM). Both representations were processed using the computer code PUFF-IV. This paper describes the procedures used to generate the RPCM and CSCM in the resonance region for ENDF/B-VII.1. The impact of data uncertainty in nuclear reactor benchmark calculations is also presented.
Robert R. Lompay; Alexander N. Petrov
2013-07-01T23:59:59.000Z
Arbitrary diffeomorphically invariant metric-torsion theories of gravity are considered. It is assumed that Lagrangians of such theories contain derivatives of field variables (tensor densities of arbitrary ranks and weights) up to a second order only. The generalized Klein-Noether methods for constructing manifestly covariant identities and conserved quantities are developed. Manifestly covariant expressions are constructed without including auxiliary structures like a background metric. In the Riemann-Cartan space, the following \\emph{manifestly generally covariant results} are presented: (a) The complete generalized system of differential identities (the Klein-Noether identities) is obtained. (b) The generalized currents of three types depending on an arbitrary vector field displacements are constructed: they are the canonical Noether current, symmetrized Belinfante current and identically conserved Hilbert-Bergmann current. In particular, it is stated that the symmetrized Belinfante current does not depend on divergences in the Lagrangian. (c) The generalized boundary Klein theorem (third Noether theorem) is proved. (d) The construction of the generalized superpotential is presented in details, and questions related to its ambiguities are analyzed.
A Concise Method for Storing and Communicating the Data Covariance Matrix
Larson, Nancy M [ORNL
2008-10-01T23:59:59.000Z
The covariance matrix associated with experimental cross section or transmission data consists of several components. Statistical uncertainties on the measured quantity (counts) provide a diagonal contribution. Off-diagonal components arise from uncertainties on the parameters (such as normalization or background) that figure into the data reduction process; these are denoted systematic or common uncertainties, since they affect all data points. The full off-diagonal data covariance matrix (DCM) can be extremely large, since the size is the square of the number of data points. Fortunately, it is not necessary to explicitly calculate, store, or invert the DCM. Likewise, it is not necessary to explicitly calculate, store, or use the inverse of the DCM. Instead, it is more efficient to accomplish the same results using only the various component matrices that appear in the definition of the DCM. Those component matrices are either diagonal or small (the number of data points times the number of data-reduction parameters); hence, this implicit data covariance method requires far less array storage and far fewer computations while producing more accurate results.
Smart Doorplate WOLFGANG TRUMLER, FARUK BAGCI, JAN PETZOLD, THEO UNGERER
Ungerer, Theo
}@informatik.uni-augsburg.de Abstract: This paper introduces the vision of smart doorplates within an office building. The doorplates. Introduction Smart buildings represent an important application area of ubiquitous computing that includes context-aware and networked smart appliances. Most smart building technologies are developed for smart
Smart Doorplate WOLFGANG TRUMLER, FARUK BAGCI, JAN PETZOLD, THEO UNGERER
Ungerer, Theo
}@informatik.uniaugsburg.de Abstract: This paper introduces the vision of smart doorplates within an office building. The doorplates. Introduction Smart buildings represent an important application area of ubiquitous computing that includes contextaware and networked smart appliances. Most smart building technologies are developed for smart
Bystroff, Christopher; Webb-Robertson, Bobbie-Jo M.
2009-05-06T23:59:59.000Z
Amino acid sequence probability distributions, or profiles, have been used successfully to predict secondary structure and local structure in proteins. Profile models assume the statistical independence of each position in the sequence, but the energetics of protein folding is better captured in a scoring function that is based on pairwise interactions, like a force field. I-sites motifs are short sequence/structure motifs that populate the protein structure database due to energy-driven convergent evolution. Here we show that a pairwise covariant sequence model does not predict alpha helix or beta strand significantly better overall than a profile-based model, but it does improve the prediction of certain loop motifs. The finding is best explained by considering secondary structure profiles as multivariant, all-or-none models, which subsume covariant models. Pairwise covariance is nonetheless present and energetically rational. Examples of negative design are present, where the covariances disfavor non-native structures. Measured pairwise covariances are shown to be statistically robust in cross-validation tests, as long as the amino acid alphabet is reduced to nine classes. We present an updated I-sites local structure motif library and web server that provide sequence covariance information for all types of local structure in globular proteins.
Covariant asymmetric wave packet for a field-theoretical description of neutrino oscillations
V. A. Naumov; D. S. Shkirmanov
2014-09-16T23:59:59.000Z
We consider a class of models for the relativistic covariant wave packets which can be used as asymptotically free in and out states in the quantum field theoretical formalisms for description of the neutrino flavor oscillation phenomenon. We demonstrate that the new "asymmetric" wave packet (AWP) is an appropriate alternative for the more convenient "symmetric" wave packets, like the so-called relativistic Gaussian packet (RGP) widely used in the QFT-based approaches to neutrino oscillations. We show that RGP is not a particular case of AWP, although many properties of these models are almost identical in the quasistable regime. We discuss some features of AWP distinguishing it from RGP.
Covariant asymmetric wave packet for a field-theoretical description of neutrino oscillations
Naumov, V A
2014-01-01T23:59:59.000Z
We consider a class of models for the relativistic covariant wave packets which can be used as asymptotically free in and out states in the quantum field theoretical formalisms for description of the neutrino flavor oscillation phenomenon. We demonstrate that the new "asymmetric" wave packet (AWP) is an appropriate alternative for the more convenient "symmetric" wave packets, like the so-called relativistic Gaussian packet (RGP) widely used in the QFT-based approaches to neutrino oscillations. We show that RGP is not a particular case of AWP, although many properties of these models are almost identical in the quasistable regime. We discuss some features of AWP distinguishing it from RGP.
NEUTRON CROSS SECTION COVARIANCES FROM THERMAL ENERGY TO 20 MeV.
ROCHMAN,D.; HERMAN, M.; OBLOZINSKY, P.; MUGHABGHAB, S.F.; PIGNI, M.; KAWANO, T.
2007-04-27T23:59:59.000Z
We describe new method for energy-energy covariance calculation from the thermal energy up to 20 MeV. It is based on three powerful basic components: (i) Atlas of Neutron Resonances in the resonance region; (ii) the nuclear reaction model code EMPIRE in the unresolved resonance and fast neutron regions, and (iii) the Bayesian code KALMAN for correlations and error propagation. Examples for cross section uncertainties and correlations on {sup 90}Zr and {sup 193}Ir illustrate this approach in the resonance and fast neutron regions.
Bernard Jancewicz
1998-07-17T23:59:59.000Z
We present pictorial means of distinguishing contravariant vectors (or simply vectors) from covariant vectors (or linear forms). When one depicts vector as the directed segment, then the pictorial image of a linear form is a family of equidistant parallel planes with an arrow joining the neighbouring planes and showing the direction of increase of the form. First of these planes is the linear subspace of dimension two on which the linear form gives value zero. Several examples of physical quantities are given which are naturally vectors, and others which are naturally linear forms.
Covariant nucleon wave function with S, D, and P-state components
Franz Gross, G. Ramalho, M. T. Pena
2012-05-01T23:59:59.000Z
Expressions for the nucleon wave functions in the covariant spectator theory (CST) are derived. The nucleon is described as a system with a off-mass-shell constituent quark, free to interact with an external probe, and two spectator constituent quarks on their mass shell. Integrating over the internal momentum of the on-mass-shell quark pair allows us to derive an effective nucleon wave function that can be written only in terms of the quark and diquark (quark-pair) variables. The derived nucleon wave function includes contributions from S, P and D-waves.
On Weyl channels being covariant with respect to the maximum commutative group of unitaries
G. G. Amosov
2006-08-10T23:59:59.000Z
We investigate the Weyl channels being covariant with respect to the maximum commutative group of unitary operators. This class includes the quantum depolarizing channel and the "two-Pauli" channel as well. Then, we show that our estimation of the output entropy for a tensor product of the phase damping channel and the identity channel based upon the decreasing property of the relative entropy allows to prove the additivity conjecture for the minimal output entropy for the quantum depolarizing channel in any prime dimesnsion and for the "two Pauli" channel in the qubit case.
Photon-neutrino interaction in theta-exact covariant noncommutative field theory
R. Horvat; D. Kekez; P. Schupp; J. Trampetic; J. You
2011-08-04T23:59:59.000Z
Photon-neutrino interactions arise quite naturally in noncommutative field theories. Such couplings are absent in ordinary field theory and imply experimental lower bounds on the energy scale Lambda_NC ~ 1/|theta|^2 of noncommutativity. Using non-perturbative methods and a Seiberg-Witten map based covariant approach to noncommutative gauge theory, we obtain theta-exact expressions for the interactions, thereby eliminating previous restrictions to low-energy phenomena. We discuss implications for plasmon decay, neutrino charge radii, big bang nucleosynthesis and ultrahigh energy cosmic rays. Our results behave reasonably throughout all interaction energy scales, thus facilitating further phenomenological applications.
On Weyl channels being covariant with respect to the maximum commutative group of unitaries
Amosov, Grigori G. [Department of Higher Mathematics, Moscow Institute of Physics and Technology, Dolgoprudny 141700 (Russian Federation)
2007-01-15T23:59:59.000Z
We investigate the Weyl channels being covariant with respect to the maximum commutative group of unitary operators. This class includes the quantum depolarizing channel and the 'two-Pauli' channel as well. Then, we show that our estimation of the output entropy for a tensor product of the phase damping channel and the identity channel based upon the decreasing property of the relative entropy allows to prove the additivity conjecture for the minimal output entropy for the quantum depolarizing channel in any prime dimension and for the two-Pauli channel in the qubit case.
PIGNI,M.T.; HERMAN, M.; OBLOZINSKY, P.
2008-03-01T23:59:59.000Z
We produced a large set of neutron cross section covariances in the energy range of 5 keV-20 MeV. The present set of data on 57 structural materials and 31 heavy nuclei follows our earlier work on 219 fission product materials and completes our extensive contribution to the low-fidelity covariance project (307 materials). This project aims to provide initial, low-fidelity yet consistent estimates of covariance data for nuclear criticality safety applications. The evaluation methodology combines the nuclear reaction model code EMPIRE which calculates sensitivity to nuclear reaction model parameters, and the Bayesian code KALMAN that propagates uncertainties of the model parameters to cross sections. Taking into account the large scale of the project, only marginal reference to experimental data was made. The covariances were derived from the perturbation of several key model parameters selected by the sensitivity analysis. These parameters refer to the optical model potential, the level densities and the strength of the pre-equilibrium emission. This work represents the first attempt ever to generate nuclear data covariances on such a large scale.
Pion production in proton-proton collisions in a covariant one boson exchange model
A. Engel; A. K. Dutt-Mazumder; R. Shyam; U. Mosel
1996-01-18T23:59:59.000Z
Motivated by the renewed interest in studying the pion production on nuclei with protons at few GeV incident energies, we investigate the pion production in proton-proton collisions over an energy range of 300 $MeV$ to 2 $GeV$. Starting from a realistic one-boson exchange model with parameters fitted to the amplitudes of the elastic nucleon-nucleon scattering, we perform fully covariant calculations for the total, double and triple differential cross-sections of the $p(p,n\\pi^+)p$ and $p(p,p\\pi^0)p$ reactions. The calculations incorporate the exchange of $\\pi, \\rho,\\omega$ and $\\sigma$ mesons and treat nucleon and delta isobar as intermediate states. We obtain a reasonably good agreement with the experimental data in the entire range of beam energies. The form of the covariant delta propagator, the cut-off parameter for the $\\pi NN$ and $\\pi N\\Delta$ vertex form factors and the energy dependence of the delta isobar decay width is investigated.
Cremaschini, Claudio, E-mail: claudiocremaschini@gmail.com; Stuchlík, Zden?k [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic)] [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic); Tessarotto, Massimo [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic) [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic); Department of Mathematics and Geosciences, University of Trieste, Via Valerio 12, 34127 Trieste (Italy)
2014-05-15T23:59:59.000Z
Astrophysical plasmas in the surrounding of compact objects and subject to intense gravitational and electromagnetic fields are believed to give rise to relativistic regimes. Theoretical and observational evidences suggest that magnetized plasmas of this type are collisionless and can persist for long times (e.g., with respect to a distant observer, coordinate, time), while exhibiting geometrical structures characterized by the absence of well-defined spatial symmetries. In this paper, the problem is posed whether such configurations can correspond to some kind of kinetic equilibrium. The issue is addressed from a theoretical perspective in the framework of a covariant Vlasov statistical description, which relies on the method of invariants. For this purpose, a systematic covariant variational formulation of gyrokinetic theory is developed, which holds without requiring any symmetry condition on the background fields. As a result, an asymptotic representation of the relativistic particle magnetic moment is obtained from its formal exact solution, in terms of a suitably defined invariant series expansion parameter (perturbative representation). On such a basis, it is shown that spatially non-symmetric kinetic equilibria can actually be determined, an example being provided by Gaussian-like distributions. As an application, the physical mechanisms related to the occurrence of a non-vanishing equilibrium fluid 4-flow are investigated.
Do we need model-dependent covariances when we test cosmological models with galaxy power spectra?
Kalus, B; Samushia, L
2015-01-01T23:59:59.000Z
We consider the shape of the posterior distribution to be used when fitting cosmological models to power spectra measured from galaxy surveys. At very large scales, Gaussian posterior distributions in the power do not approximate the posterior distribution $\\mathcal P_R$ we expect for a Gaussian density field $\\delta_\\mathbf{k}$, even if we vary the covariance matrix according to the model to be tested. We compare alternative posterior distributions with $\\mathcal P_R$, both mode-by-mode and in terms of expected $f_\\mathrm{NL}$-measurements. Marginalising over a Gaussian posterior distribution $\\mathcal P_f$ with fixed covariance matrix yields a posterior mean value of $f_\\mathrm{NL}$ which, for a data set with the characteristics of Euclid, will be underestimated by $\\triangle f_\\mathrm{NL}=0.4$, while for the data release 9 (DR9) of the Sloan Digital Sky Survey (SDSS)-III Baryon Oscillation Spectroscopic Survey (BOSS) it will be underestimated by $\\triangle f_\\mathrm{NL}=19.1$. The inverse cubic normal dist...
Non-Gaussian Covariance of CMB B-modes of Polarization and Parameter Degradation
Chao Li; Tristan L. Smith; Asantha Cooray
2006-08-01T23:59:59.000Z
The B-mode polarization lensing signal is a useful probe of the neutrino mass and to a lesser extent the dark energy equation of state as the signal depends on the integrated mass power spectrum between us and the last scattering surface. This lensing B-mode signal, however, is non-Gaussian and the resulting non-Gaussian covariance to the power spectrum cannot be ignored as correlations between B-mode bins are at a level of 0.1. For temperature and E-mode polarization power spectra, the non-Gasussian covariance is not significant, where we find correlations at the 10^{-5} level even for adjacent bins. The resulting degradation on neutrino mass and dark energy equation of state is about a factor of 2 to 3 when compared to the case where statistics are simply considered to be Gaussian. We also discuss parameter uncertainties achievable in upcoming experiments and show that at a given angular resolution for polarization observations, increasing the sensitivity beyond a certain noise value does not lead to an improved measurement of the neutrino mass and dark energy equation of state with B-mode power spectrum. For Planck, the resulting constraints on the sum of the neutrino masses is ~ 0.2 eV and on the dark energy equation of state parameter we find, sigma_w ~ 0.5.
Separation of correlated astrophysical sources using multiple-lag data covariance matrices
L. Bedini; D. Herranz; E. Salerno; C. Baccigalupi; E. E. Kuruouglu; A. Tonazzini
2004-07-06T23:59:59.000Z
This paper deals with a source separation strategy based on second-order statistics, namely, on data covariance matrices estimated at several lags. In general, ``blind'' approaches to source separation do not assume any knowledge on the mixing operator; however, any prior information about the possible structure of the mixing operator can improve the solution. Unlike ICA blind separation approaches, where mutual independence between the sources is assumed, our method only needs to constrain second-order statistics, and is effective even if the original sources are significantly correlated. Besides the mixing matrix, our strategy is also capable to evaluate the source covariance functions at several lags. Moreover, once the mixing parameters have been identified, a simple deconvolution can be used to estimate the probability density functions of the source processes. To benchmark our algorithm, we used a database that simulates the one expected from the instruments that will operate onboard ESA's Planck Surveyor Satellite to measure the CMB anisotropies all over the celestial sphere. The assumption was made that the emission spectra of the galactic foregrounds can be parametrised, thus reducing the number of unknowns for system identification to the number of the foreground radiations. We performed separation in several sky patches, featuring different levels of galactic contamination to the CMB, and assuming several noise levels, including the ones derived from the Planck specifications.
Nozawa, Satoshi; Kohyama, Yasuharu; Itoh, Naoki [Josai Junior College, 1-1 Keyakidai, Sakado-shi, Saitama, 350-0295 (Japan); Department of Physics, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554 (Japan)
2010-11-15T23:59:59.000Z
We study a covariant formalism for the Sunyaev-Zeldovich effects developed in the previous papers by the present authors, and derive analytic expressions for the redistribution functions in the Thomson approximation. We also explore another covariant formalism recently developed by Poutanen and Vurm. We show that the two formalisms are mathematically equivalent in the Thomson approximation which is fully valid for the cosmic microwave background photon energies. The present finding will establish a theoretical foundation for the analysis of the Sunyaev-Zeldovich effects for the clusters of galaxies.
P. W. Zhao; Z. P. Li; J. M. Yao; J. Meng
2010-11-11T23:59:59.000Z
A new parametrization PC-PK1 for the nuclear covariant energy density functional with nonlinear point-coupling interaction is proposed by fitting to observables for 60 selected spherical nuclei, including the binding energies, charge radii and empirical pairing gaps. The success of PC-PK1 is illustrated in its description for infinite nuclear matter and finite nuclei including the ground-state and low-lying excited states. Particularly, PC-PK1 improves the description for isospin dependence of binding energy along either the isotopic or the isotonic chains, which makes it more reliable for application in exotic nuclei. The predictive power of PC-PK1 is also illustrated for the nuclear low-lying excitation states in a five-dimensional collective Hamiltonian in which the parameters are determined by constrained calculations for triaxial shapes.
Mottola, E.
1993-03-01T23:59:59.000Z
After first reviewing the issue of vacuum energy (the cosmological constant problem) in the Einstein theory, the covariant path integral for gravity in four dimensions is constructed. The problem of vacuum energy requires determining the correct ground state of the quantum theory of gravity, and as such is an infrared problem, arising prior to and independently of the physics of the Planck scale. It is addressed in these lectures by studying the infrared fixed point of the low energy effective action of the conformal factor generated by the quantum trace anomaly in four dimensions. The infrared fixed point of this effective theory describes a conformally invariant phase of gravity with a vanishing effective cosmological term.
Mottola, E.
1993-01-01T23:59:59.000Z
After first reviewing the issue of vacuum energy (the cosmological constant problem) in the Einstein theory, the covariant path integral for gravity in four dimensions is constructed. The problem of vacuum energy requires determining the correct ground state of the quantum theory of gravity, and as such is an infrared problem, arising prior to and independently of the physics of the Planck scale. It is addressed in these lectures by studying the infrared fixed point of the low energy effective action of the conformal factor generated by the quantum trace anomaly in four dimensions. The infrared fixed point of this effective theory describes a conformally invariant phase of gravity with a vanishing effective cosmological term.
Qian Zhao; Bao Yuan Sun; Wen Hui Long
2014-11-23T23:59:59.000Z
The isospin coupling-channel decomposition of the potential energy density functional is carried out within the covariant density functional theory, and their isospin and density dependence in particular the influence on the symmetry energy is studied. It is found that both isospin-singlet and isospin-triplet components of the potential energy play the dominant role in deciding the symmetry energy, especially when the Fock diagram is introduced. The results illustrate a quite different mechanism to the origin of the symmetry energy from the microscopic Brueckner-Hartree-Fock theory, and demonstrate the importance of the Fork diagram in the CDF theory, especially from the isoscalar mesons, in the isospin properties of the in-medium nuclear force at high density.
Qiang Zhao; Jian Min Dong; Jun Ling Song; Wen Hui Long
2014-07-23T23:59:59.000Z
Half-life of proton radioactivity of spherical proton emitters is studied within the scheme of covariant density functional (CDF) theory, and for the first time the potential barrier that prevents the emitted proton is extracted with the similarity renormalization group (SRG) method, in which the spin-orbit potential along with the others that turn out to be non-negligible can be derived automatically. The spectroscopic factor that is significant is also extracted from the CDF calculations. The estimated half-lives are found in good agreement with the experimental values, which not only confirms the validity of the CDF theory in describing the proton-rich nuclei, but also indicates the prediction power of present approach to calculate the half-lives and in turn to extract the structural information of proton emitters.
Yao, J M; Hagino, K; Ring, P; Meng, J
2014-01-01T23:59:59.000Z
We report a systematic study of nuclear matrix elements (NMEs) in neutrinoless double-beta decays with state-of-the-art beyond mean-field covariant density functional theory. The dynamic effects of particle-number and angular-momentum conservations as well as quadrupole shape fluctuations are taken into account with projections and generator coordinate method for both initial and final nuclei. The full relativistic transition operator is adopted to calculate the NMEs which are found to be consistent with the results of previous beyond non-relativistic mean-field calculation based on a Gogny force with the exception of $^{150}$Nd. Our study shows that the total NMEs can be well approximated by the pure axial-vector coupling term, the calculation of which is computationally much cheaper than that of full terms.
Small, Dylan
pretreatment covariates, perhaps by matching, a sensitivity analysis examines the impact of an unobserved and is more interpretable to subject matter experts. We will illustrate our method using data from the U perpetration of serious violence. Using data from Chicago and controlling for 153 pre-exposure covariates
Alberto Escalante
2006-07-13T23:59:59.000Z
Using a covariant and gauge invariant geometric structure constructed on the Witten covariant phase space for Dirac-Nambu-Goto bosonic p-branes propagating in a curved background, we find the canonically conjugate variables, and the relevant commutation relations are considered, as well as, we find the canonical variables for the Gauss-Bonnet topological term in string theory.
Robust ensemble filtering and its relation to covariance inflation in the ensemble Kalman filter
Xiaodong Luo; Ibrahim Hoteit
2011-07-31T23:59:59.000Z
We propose a robust ensemble filtering scheme based on the $H_{\\infty}$ filtering theory. The optimal $H_{\\infty}$ filter is derived by minimizing the supremum (or maximum) of a predefined cost function, a criterion different from the minimum variance used in the Kalman filter. By design, the $H_{\\infty}$ filter is more robust than the Kalman filter, in the sense that the estimation error in the $H_{\\infty}$ filter in general has a finite growth rate with respect to the uncertainties in assimilation, except for a special case that corresponds to the Kalman filter. The original form of the $H_{\\infty}$ filter contains global constraints in time, which may be inconvenient for sequential data assimilation problems. Therefore we introduce a variant that solves some time-local constraints instead, and hence we call it the time-local $H_{\\infty}$ filter (TLHF). By analogy to the ensemble Kalman filter (EnKF), we also propose the concept of ensemble time-local $H_{\\infty}$ filter (EnTLHF). We outline the general form of the EnTLHF, and discuss some of its special cases. In particular, we show that an EnKF with certain covariance inflation is essentially an EnTLHF. In this sense, the EnTLHF provides a general framework for conducting covariance inflation in the EnKF-based methods. We use some numerical examples to assess the relative robustness of the TLHF/EnTLHF in comparison with the corresponding KF/EnKF method.
Sebastian Schubert; Valerio Lucarini
2014-10-06T23:59:59.000Z
The classical approach for studying atmospheric variability is based on defining a background state and studying the linear stability of the small fluctuations around such a state. Weakly non-linear theories can be constructed using higher order expansions terms. While these methods have undoubtedly great value for elucidating the relevant physical processes, they are unable to follow the dynamics of a turbulent atmosphere. We provide a first example of extension of the classical stability analysis to a non-linearly evolving atmosphere. The so-called covariant Lyapunov vectors (CLVs) provide a covariant basis describing the directions of exponential expansion and decay of perturbations to the non-linear trajectory of the flow. We use such a formalism to re-examine the basic barotropic and baroclinic processes of the atmosphere with a quasi-geostrophic beta-plane two-layer model in a periodic channel driven by a forced meridional temperature gradient $\\Delta T$. We explore three settings of $\\Delta T$, representative of relatively weak turbulence, well-developed turbulence, and intermediate conditions. We construct the Lorenz energy cycle for each CLV describing the energy exchanges with the background state. A positive baroclinic conversion rate is a necessary but not a sufficient condition of instability. Barotropic instability is present only for few very unstable CLVs for large values of $\\Delta T$. Following classical necessary conditions for barotropic/baroclinic instability, we find a clear relationship between the properties of the eddy fluxes of a CLV and its instability properties. There is support for the conjecture that the CLVs with positive baroclinic conversion potentially form a reduced basis of the trajectory similar to approaches using empirical orthogonal functions.
Danon, Yaron
ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia 11 Nuclear Research and Consultancy Group, P 2011) The ENDF/B-VII.1 library is our latest recommended evaluated nuclear data file for use in nuclear
Gottwald, Georg A.
Controlling Overestimation of Error Covariance in Ensemble Kalman Filters with Sparse Observations: A Variance-Limiting Kalman Filter GEORG A. GOTTWALD AND LEWIS MITCHELL School of Mathematics and Statistics of an ensemble Kalman filter when only partial observations are available is considered. In particular
Ryan, Sarah M.
1 Title: Optimal Replacement in the Proportional Hazards Model with semi-Markovian Covariate Process and Continuous Monitoring Index terms--Optimal replacement, proportional hazards model, semi-Markov process, threshold replacement policy, sensitivity analysis SUMMARY This paper deals with the optimal
to have an eigen decomposition which can be repre- sented as a sparse matrix transform (SMT). The SMT that the SMT-based covariance estimates are consistently more accurate than both tra- ditional shrinkage implementation of the estimated eigen-transformation using the SMT representation. In fact, the SMT can be viewed
Tu, Kevin
, latent and carbon dioxide from eddy covariances presented by Kevin Tu, St. Louis (10/97). The properties
Computation of Large Covariance Matrices by SAMMY on Graphical Processing Units and Multicore CPUs
Arbanas, Goran [ORNL; Dunn, Michael E [ORNL; Wiarda, Dorothea [ORNL
2011-01-01T23:59:59.000Z
Computational power of Graphical Processing Units and multicore CPUs was harnessed by the nuclear data evaluation code SAMMY to speed up computations of large Resonance Parameter Covariance Matrices (RPCMs). This was accomplished by linking SAMMY to vendor-optimized implementations of the matrix-matrix multiplication subroutine of the Basic Linear Algebra Library to compute the most time-consuming step. The U-235 RPCM computed previously using a triple-nested loop was re-computed using the NVIDIA implementation of the subroutine on a single Tesla Fermi Graphical Processing Unit, and also using the Intel's Math Kernel Library implementation on two different multicore CPU systems. A multiplication of two matrices of dimensions 16,000 x 20,000 that had previously taken days, took approximately one minute on the GPU. Similar performance was achieved on a dual six-core CPU system. The magnitude of the speed-up suggests that these, or similar, combinations of hardware and libraries may be useful for large matrix operations in SAMMY. Uniform interfaces of standard linear algebra libraries make them a promising candidate for a programming framework of a new generation of SAMMY for the emerging heterogeneous computing platforms.
Non-Gaussianity of a single scalar field in general covariant Ho?ava-Lifshitz gravity
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Huang, Yongqing; Wang, Anzhong
2012-11-01T23:59:59.000Z
In this paper, we study non-Gaussianity generated by a single scalar field in slow-roll inflation in the framework of the nonrelativistic general covariant Horava-Lifshitz theory of gravity with the projectability condition and an arbitrary coupling constant ?, where ? characterizes the deviation of the theory from general relativity (GR) in the infrared. We find that the leading effect of self-interaction, contrary to the case of the minimal scenario of GR, is in general of the order ?ˆn?3/2, where ? is a slow-roll parameter, and ?ˆn(n=3,5) are the dimensionless coupling coefficients of the sixth-order operators of the Lifshitz scalar and have no contributions to power spectra and indices of both scalar and tensor. The bispectrum, comparing with the standard one given in GR, is enhanced and gives rise to a large value of the nonlinearity parameter fNL. We study how the modified dispersion relation with high order moment terms affects the evaluation of the mode function and in turn the bispectrum, and we show explicitly that the mode function takes various asymptotic forms during different periods of its evolution. In particular, we find that it is in general of superpositions of oscillatory functions, instead of plane waves like in the minimal scenario of GR. This results in a large enhancement of the folded shape in the bispectrum.
Symmetric energy-momentum tensor: the Abraham form and the explicitly covariant formula
Nesterenko, V V
2015-01-01T23:59:59.000Z
We compare the explicitly covariant 4-dimensional formula, recently proposed by V.P.\\ Makarov and S.A.\\ Rukhadze [Phys. Usp. {\\bf 52} 937 (2011)] for symmetric energy-momentum tensor of electromagnetic field in a medium, and the energy-momentum tensor derived by Abraham in the 3-dimensional vector form. It is shown that these two objects coincide only on the physical configuration space $\\overline \\Gamma $, formed by the field vectors and the velocity of the medium, which satisfy the constitutive relations. It should be emphasized that the 3-dimensional vector formulae for the components of the energy-momentum tensor were obtained by Abraham only on $\\overline \\Gamma $, and the task of their extension to the whole unconditional configuration space $\\Gamma$ was not posed. In order to accomplish the comparison noted above we derive the Makarov-Rukhadze formula a new by another method, namely, by generalizing the Abraham reasoning. The comparison conducted enables one to treat the Makarov-Rukhadze formula as a u...
Estimated {sup 55}Mn and {sup 90}Zr Cross Section Covariances in the Fast Neutron Energy Region
Pigni, M.T. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)], E-mail: pigni@bnl.gov; Herman, M.; Oblozinsky, P. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)
2008-12-15T23:59:59.000Z
We completed estimates of neutron cross section covariances for {sup 55}Mn and {sup 90}Zr, from the keV energy range to 25 MeV, considering the most important reaction channels, total, elastic, inelastic, capture, and (n,2n). The nuclear reaction model code EMPIRE was used to calculate sensitivity to model parameters by a perturbation of parameters that define the optical model potential, nuclear level densities and strength of the pre-equilibrium emission. The sensitivity analysis was performed with the set of parameters which reproduces the ENDF/B-VII.0 cross sections. The experimental data were analyzed and both statistical and systematic uncertainties were extracted from almost 30 selected experiments. Then, the Bayesian code KALMAN was used to combine the sensitivity analysis and the experiments to obtain the evaluated covariance matrices.
Energy-dependent Lorentz covariant parameterization of the NN interaction between 50 and 200 MeV
Z. P. Li; G. C. Hillhouse; J. Meng
2007-12-03T23:59:59.000Z
For laboratory kinetic energies between 50 and 200 MeV, we focus on generating an energy-dependent Lorentz covariant parameterization of the on-shell nucleon-nucleon (NN) scattering amplitudes in terms of a number of Yukawa-type meson exchanges in first-order Born approximation. This parameterization provides a good description of NN scattering observables in the energy range of interest, and can also be extrapolated to energies between 40 and 300 MeV.
Kai Lin; Shinji Mukohyama; Anzhong Wang
2013-01-07T23:59:59.000Z
We study spherically symmetric, stationary vacuum configurations in general covariant theory (U(1) extension) of Ho\\v{r}ava-Lifshitz gravity with the projectability condition and an arbitrary coupling constant $\\lambda$, and obtain all the solutions in closed forms. If the gauge field $A$ and the Newtonian prepotential $\\varphi$ do not directly couple to matter fields, the theory is inconsistent with solar system tests for $\\lambda\
Giuseppe Palmiotti; Massimo Salvatores
2014-04-01T23:59:59.000Z
The Working Party on International Nuclear Data Evaluation Cooperation (WPEC) of the Nuclear Science Committee under the Nuclear Energy Agency (NEA/OECD) established a Subgroup (called “Subgroup 33”) in 2009 on “Methods and issues for the combined use of integral experiments and covariance data.” The first stage was devoted to producing the description of different adjustment methodologies and assessing their merits. A detailed document related to this first stage has been issued. Nine leading organizations (often with a long and recognized expertise in the field) have contributed: ANL, CEA, INL, IPPE, JAEA, JSI, NRG, IRSN and ORNL. In the second stage a practical benchmark exercise was defined in order to test the reliability of the nuclear data adjustment methodology. A comparison of the results obtained by the participants and major lessons learned in the exercise are discussed in the present paper that summarizes individual contributions which often include several original developments not reported separately. The paper provides the analysis of the most important results of the adjustment of the main nuclear data of 11 major isotopes in a 33-group energy structure. This benchmark exercise was based on a set of 20 well defined integral parameters from 7 fast assembly experiments. The exercise showed that using a common shared set of integral experiments but different starting evaluated libraries and/or different covariance matrices, there is a good convergence of trends for adjustments. Moreover, a significant reduction of the original uncertainties is often observed. Using the a–posteriori covariance data, there is a strong reduction of the uncertainties of integral parameters for reference reactor designs, mainly due to the new correlations in the a–posteriori covariance matrix. Furthermore, criteria have been proposed and applied to verify the consistency of differential and integral data used in the adjustment. Finally, recommendations are given for an appropriate use of sensitivity analysis methods and indications for future work are provided.
Barlich, G.L.; Nasseri, S.S.
1990-01-01T23:59:59.000Z
Good decision-making in materials accounting requires a valid calculation of control limits and detection sensitivity for facilities handling special nuclear materials (SNM). A difficult aspect of this calculation is determining the appropriate variance and covariance values for the terms in the materials balance (MB) equation. Computer software such as MAVARIC (Materials Accounting VARIance Calculator) and PROFF (PROcessing and Fuel Facilities calculator) can efficiently select and combine variance terms. These programs determine the variance and covariance of an MB equation by first obtaining relations for the variance and covariance of each term in the MB equation through propagating instrument errors and then substituting the measured quantities and their uncertainties into these relations. MAVARIC is a custom spreadsheet used with the second release of LOTUS 1-2-3.** PROFF is a stand-alone menu-driven program requiring no commercial software. Programs such as MAVARIC and PROFF facilitate the complex calculations required to determine the detection sensitivity of an SNM facility. These programs can also be used to analyze materials accounting systems.
Roman G. Smirnov; Jin Yue
2004-08-03T23:59:59.000Z
The invariant theory of Killing tensors (ITKT) is extended by introducing the new concepts of covariants and joint invariants of (product) vector spaces of Killing tensors defined in pseudo-Riemannian spaces of constant curvature. The covariants are employed to solve the problem of classification of the orthogonal coordinate webs generated by non-trivial Killing tensors of valence two defined in the Euclidean and Minkowski planes. Illustrative examples are provided.
Cao H. Nam
2014-11-10T23:59:59.000Z
We consider the space-time at short distances in which it is described by a $D$-dimensional manifold (bulk) carrying out the principal bundle structure. As a result, this space-time manifold is foliated in the covariant way by the $(D-4)$-dimensional submanifolds, realized as the space-like internal spaces, that are smooth copies of the Lie group $G$ considered in this paper as the special unitary group. The submanifolds being transversal to the internal spaces are realized as the external spaces and in fact identified as the usual $4$-dimensional world. The fundamental degrees of freedom determining the geometrical dynamics of the bulk corresponding with short distance gravity are given by the gauge fields, the external metric field and the modulus fields setting dynamically the volume of the internal spaces. These gauge fields laying the bulk is to point precisely out the local directions of the external spaces which depend on the topological non-triviality of the space-time principal bundle. The physical size of the internal spaces is fixed dynamically by the moduli stabilization potential which completely arise from the intrinsic geometry of the bulk. A detail description of the low energy bulk gravity in the weak field limit is given around the classical ground state of the bulk. Additionally, we investigate the dynamics of the fundamentally $4$-dimensional Weyl spinor fields and the fields of carrying out the non-trivial representations of the Lie group $G$ propagating in the bulk in a detail study. These results suggest naturally the possible solutions to some the experimental problems of Standard Model, the smallness of the observed neutrino masses and a dark matter candidate.
O. Goldoni; M. F. A. da Silva; R. Chan; G. Pinheiro
2014-12-16T23:59:59.000Z
In this paper, we have studied nonstationary radiative spherically symmetric spacetime, in general covariant theory ($U(1)$ extension) of {the} Ho\\v{r}ava-Lifshitz gravity with the minimum coupling, in the post-newtonian approximation (PPN), without the projectability condition and in the infrared limit. The Newtonian prepotential $\\varphi$ was assumed null. We have shown that there is not the analogue of the Vaidya's solution in the Ho\\v{r}ava-Lifshitz Theory (HLT) with the minimum coupling, as we know in the General Relativity Theory (GRT).
Dobaczewski, J; Bender, M; Robledo, L M; Shi, Yue
2015-01-01T23:59:59.000Z
We calculate properties of the ground and excited states of nuclei in the nobelium region for proton and neutron numbers of 92 energy-density-functional (EDF) approaches, based on covariant, Skyrme, and Gogny functionals, each within two different parameter sets. A comparative analysis of the results obtained for odd-even mass staggerings, quasiparticle spectra, and moments of inertia allows us to identify single-particle and shell effects that are characteristic to these different models and to illustrate possible systematic uncertainties related to using the EDF modelling
LANSCE | Lujan Center | Publications
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
T Mang, Nicholas Leventis, One-step room-temperature synthesis of fibrous polyimide aerogels from anhydrides and isocyanates and conversion to isomorphic carbons, Journal of...
N. I. Stoilova; J. Van der Jeugt
2010-04-14T23:59:59.000Z
A Gel'fand-Zetlin basis is introduced for the irreducible covariant tensor representations of the Lie superalgebra gl(m|n). Explicit expressions for the generators of the Lie superalgebra acting on this basis are determined. Furthermore, Clebsch-Gordan coefficients corresponding to the tensor product of any covariant tensor representation of gl(m|n) with the natural representation V ([1,0,...,0]) of gl(m|n) with highest weight (1,0,. . . ,0) are computed. Both results are steps for the explicit construction of the parastatistics Fock space.
Rutger van Haasteren; Michele Vallisneri
2014-07-24T23:59:59.000Z
Many data-analysis problems involve large dense matrices that describe the covariance of stationary noise processes; the computational cost of inverting these matrices, or equivalently of solving linear systems that contain them, is often a practical limit for the analysis. We describe two general, practical, and accurate methods to approximate stationary covariance matrices as low-rank matrix products featuring carefully chosen spectral components. These methods can be used to greatly accelerate data-analysis methods in many contexts, such as the Bayesian and generalized-least-squares analysis of pulsar-timing residuals.
J. M. Alarcón; J. Martin Camalich; J. A. Oller
2013-01-21T23:59:59.000Z
The pion-nucleon sigma term ($\\sigma_{\\pi N}$) is an observable of fundamental importance because embodies information about the internal scalar structure of the nucleon. Nowadays this quantity has triggered renewed interest because it is a key input for a reliable estimation of the dark matter-nucleon spin independent elastic scattering cross section. In this proceeding we present how this quantity can be reliably extracted by employing only experimental information with the use covariant baryon chiral perturbation theory. We also contrast our extraction with updated phenomenology related to $\\sigma_{\\pi N}$ and show how this phenomenology favours a relatively large value of $\\sigma_{\\pi N}$. Finally, we extract a value of $\\sigma_{\\pi N}=59(7)$ MeV from modern partial wave analyses data.
J. M. Yao; N. Itagaki; J. Meng
2014-09-19T23:59:59.000Z
A study of 4$\\alpha$ linear-chain structure in high-lying collective excitation states of $^{16}$O with a covariant density functional theory is presented. The low-spin states are obtained by configuration mixing of particle-number and angular-momentum projected quadrupole deformed mean-field states with generator coordinate method. The high-spin states are determined by cranking calculations. These two calculations are based on the same energy density functional PC-PK1. We have found a rotational band at low-spin with the dominated intrinsic configuration considered to be the one that 4$\\alpha$ clusters stay along a common axis. The strongly deformed rod shape also appears in the high-spin region with the angular momentum $13-18\\hbar$; however whether the state is pure $4\\alpha$ linear chain or not is less obvious than that in the low-spin states.
arXiv:1302.6994v1[astro-ph.CO]27Feb2013 Power Spectrum Super-Sample Covariance
Hu, Wayne
that underlies them. Its two-point correlation function or the Fourier-transformed counterpart, the power from the large-scale structure probes. The statistical precision of power spectrum measurementsarXiv:1302.6994v1[astro-ph.CO]27Feb2013 Power Spectrum Super-Sample Covariance Masahiro Takada
Giuseppe Palmiotti; Massimo Salvatores
2015-01-01T23:59:59.000Z
This paper aims to show the main diffrences between the COMMARA-2.0 and COMMARA-2.1 evaluated covariance data in the uncertainty estimation of integral parameters of interest for a large number of typical innovative fast neutron systems.
K. V. Stepanyantz
2006-08-06T23:59:59.000Z
Contribution of matter fields to the Gell-Mann-Low function for N=1 supersymmetric Yang-Mills theory, regularized by higher covariant derivatives, is obtained using Schwinger-Dyson equations and Slavnov-Tailor identities. A possible deviation of the result from the corresponding contribution in the exact Novikov, Shifman, Vainshtein and Zakharov $\\beta$-function is discussed.
A. B. Pimenov; K. V. Stepanyantz
2007-07-26T23:59:59.000Z
Two-loop Gell-Mann-Low function is calculated for N=1 supersymmetric Yang-Mills theory, regularized by higher covariant derivatives. The integrals, which define it, are shown to be reduced to total derivatives and can be easily calculated analytically.
Zhuang, Qianlai [Purdue University; Law, Beverly E. [Oregon State University; Baldocchi, Dennis [University of California, Berkeley; Ma, Siyan [University of California, Berkeley; Chen, Jiquan [University of Toledo, Toledo, OH; Richardson, Andrew [Harvard University; Melillo, Jerry [Marine Biological Laboratory; Davis, Ken J. [Pennsylvania State University; Hollinger, D. [USDA Forest Service; Wharton, Sonia [University of California, Davis; Falk, Matthias [University of California, Davis; Paw, U. Kyaw Tha [University of California, Davis; Oren, Ram [Duke University; Katulk, Gabriel G. [Duke University; Noormets, Asko [North Carolina State University; Fischer, Marc [Lawrence Berkeley National Laboratory (LBNL); Verma, Shashi [University of Nebraska; Suyker, A. E. [University of Nebraska, Lincoln; Cook, David R. [Argonne National Laboratory (ANL); Sun, G. [USDA Forest Service; McNulty, Steven G. [USDA Forest Service; Wofsy, Steve [Harvard University; Bolstad, Paul V [University of Minnesota; Burns, Sean [University of Colorado, Boulder; Monson, Russell K. [University of Colorado, Boulder; Curtis, Peter [Ohio State University, The, Columbus; Drake, Bert G. [Smithsonian Environmental Research Center, Edgewater, MD; Foster, David R. [Harvard University; Gu, Lianhong [ORNL; Hadley, Julian L. [Harvard University; Litvak, Marcy [University of New Mexico, Albuquerque; Martin, Timothy A. [University of Florida, Gainesville; Matamala, Roser [Argonne National Laboratory (ANL); Meyers, Tilden [NOAA, Oak Ridge, TN; Oechel, Walter C. [San Diego State University; Schmid, H. P. [Indiana University; Scott, Russell L. [USDA ARS; Torn, Margaret S. [Lawrence Berkeley National Laboratory (LBNL)
2011-01-01T23:59:59.000Z
More accurate projections of future carbon dioxide concentrations in the atmosphere and associated climate change depend on improved scientific understanding of the terrestrial carbon cycle. Despite the consensus that U.S. terrestrial ecosystems provide a carbon sink, the size, distribution, and interannual variability of this sink remain uncertain. Here we report a terrestrial carbon sink in the conterminous U.S. at 0.63 pg C yr 1 with the majority of the sink in regions dominated by evergreen and deciduous forests and savannas. This estimate is based on our continuous estimates of net ecosystem carbon exchange (NEE) with high spatial (1 km) and temporal (8-day) resolutions derived from NEE measurements from eddy covariance flux towers and wall-to-wall satellite observations from Moderate Resolution Imaging Spectroradiometer (MODIS). We find that the U.S. terrestrial ecosystems could offset a maximum of 40% of the fossil-fuel carbon emissions. Our results show that the U.S. terrestrial carbon sink varied between 0.51 and 0.70 pg C yr 1 over the period 2001 2006. The dominant sources of interannual variation of the carbon sink included extreme climate events and disturbances. Droughts in 2002 and 2006 reduced the U.S. carbon sink by 20% relative to a normal year. Disturbances including wildfires and hurricanes reduced carbon uptake or resulted in carbon release at regional scales. Our results provide an alternative, independent, and novel constraint to the U.S. terrestrial carbon sink.
A Generic Timing Model for Cyber-Physical Florian Kluge, Mike Gerdes, Florian Haas, Theo Ungerer
Ungerer, Theo
, for example, the crank shaft in a combustion engine. Certain angu- larities of the crank shaft raise
Compiler correctness and the translation of logics Theo M.V. Janssen
Amsterdam, University of
be proven by finite algebraic means. PrL Compile - AssL Sem(PrL) IntP L ? Decode CompMod IntAL ? PrL of the rightmost diagram. PrL: Programming Language IntP L Interpretation of PrL AssL: Assembly Language IntAL Interpretation of AssL Sem(PrL): meanings of the PrL CompMod: abstract model of computer Several variants
SecSens -Security Architecture for Wireless Sensor Networks Faruk Bagci, Theo Ungerer
Ungerer, Theo
of sensor boards. Keywords: wireless sensor network, security architec- ture, energy efficiency, multi between nodes enhances communication flexibility. Generally, sensor nodes have limited energy and re not be transferred to sensor networks. In recent years, the research was mainly focused on issues related to energy
Theos J. Thompson, 1964 | U.S. DOE Office of Science (SC)
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron Spin Transition in theTheoretical Study on Catalysis
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Neudecker, D.; Talou, P.; Kawano, T.; Smith, D. L.; Capote, R.; Rising, M. E.; Kahler, A. C.
2015-08-01T23:59:59.000Z
We present evaluations of the prompt fission neutron spectrum (PFNS) of ²³?Pu induced by 500 keV neutrons, and associated covariances. In a previous evaluation by Talou et al. 2010, surprisingly low evaluated uncertainties were obtained, partly due to simplifying assumptions in the quantification of uncertainties from experiment and model. Therefore, special emphasis is placed here on a thorough uncertainty quantification of experimental data and of the Los Alamos model predicted values entering the evaluation. In addition, the Los Alamos model was extended and an evaluation technique was employed that takes into account the qualitative differences between normalized model predicted valuesmore »and experimental shape data. These improvements lead to changes in the evaluated PFNS and overall larger evaluated uncertainties than in the previous work. However, these evaluated uncertainties are still smaller than those obtained in a statistical analysis using experimental information only, due to strong model correlations. Hence, suggestions to estimate model defect uncertainties are presented, which lead to more reasonable evaluated uncertainties. The calculated keff of selected criticality benchmarks obtained with these new evaluations agree with each other within their uncertainties despite the different approaches to estimate model defect uncertainties. The keff one standard deviations overlap with some of those obtained using ENDF/B-VII.1, albeit their mean values are further away from unity. Spectral indexes for the Jezebel critical assembly calculated with the newly evaluated PFNS agree with the experimental data for selected (n,?) and (n,f) reactions, and show improvements for high-energy threshold (n,2n) reactions compared to ENDF/B-VII.1.« less
Derrien, Herve [ORNL; Leal, Luiz C [ORNL; Larson, Nancy M [ORNL
2008-01-01T23:59:59.000Z
To obtain the resonance parameters in a single energy range up to 2.5 keV neutron energy and the corresponding covariance matrix, a reevaluation of 239Pu was performed with the analysis code SAMMY. The most recent experimental data were analyzed in the energy range thermal to 2.5 keV. The experimental data were renormalized, aligned on a common energy scale, and corrected for residual background. Average neutron transmission and cross sections calculated with the new resonance parameters were compared to the corresponding experimental data and to ENDF/B-VI.
J. M. Yao; L. S. Song; K. Hagino; P. Ring; J. Meng
2015-01-29T23:59:59.000Z
We report a systematic study of nuclear matrix elements (NMEs) in neutrinoless double-beta decays with a state-of-the-art beyond mean-field covariant density functional theory. The dynamic effects of particle-number and angular-momentum conservations as well as quadrupole shape fluctuations are taken into account with projections and generator coordinate method for both initial and final nuclei. The full relativistic transition operator is adopted to calculate the NMEs. The present systematic studies show that in most of the cases there is a much better agreement with the previous non-relativistic calculation based on the Gogny force than in the case of the nucleus $^{150}$Nd found in Song et al. [Phys. Rev. C 90, 054309 (2014)]. In particular, we find that the total NMEs can be well approximated by the pure axial-vector coupling term with a considerable reduction of the computational effort.
Faizal, Mir; Higuchi, Atsushi [Department of Mathematics, University of York, Heslington, York YO10 5DD (United Kingdom)
2008-09-15T23:59:59.000Z
The propagators of the Faddeev-Popov (FP) ghosts for Yang-Mills theories and perturbative quantum gravity in the covariant gauge are infrared (IR) divergent in de Sitter spacetime. We point out, however, that the modes responsible for these divergences will not contribute to loop diagrams in computations of time-ordered products in either Yang-Mills theories or perturbative quantum gravity. Therefore, we propose that the IR-divergent FP-ghost propagator should be regularized by a small mass term that is sent to zero in the end of any perturbative calculations. This proposal is equivalent to using the effective FP-ghost propagators, which we present in an explicit form, obtained by removing the modes responsible for the IR divergences. We also make some comments on the corresponding propagators in anti-de Sitter spacetime.
Mei, H; Yao, J M; Motoba, T
2015-01-01T23:59:59.000Z
We present a detailed formalism of the microscopic particle-rotor model for hypernuclear low-lying states based on a covariant density functional theory. In this method, the hypernuclear states are constructed by coupling a hyperon to low-lying states of the core nucleus, which are described by the generator coordinate method (GCM) with the particle number and angular momentum projections. We apply this method to study in detail the low-lying spectrum of $^{13}_{~\\Lambda}$C and $^{21}_{~\\Lambda}$Ne hypernuclei. We also briefly discuss the structure of $^{155}_{~~\\Lambda}$Sm as an example of heavy deformed hypernuclei. It is shown that the low-lying excitation spectrum with positive parity states of the hypernuclei, which are dominated by $\\Lambda$ hyperon in $s$-orbital coupled to the core states, are similar to that for the corresponding core states, while the electric quadrupole transition strength, $B(E2)$, from the 2$^+_1$ state to the ground state is reduced according to the mass number of the hypernucle...
Sever Spanulescu
2009-12-15T23:59:59.000Z
The paper proposes a method to obtain the optimal basis set for solving the self consistent field (SCF) equations for large atomic systems in order to calculate the energy barriers in tunneling structures, with higher accuracy and speed. Taking into account the stochastic-like nature of the samples of all the involved wave functions for many body problems, a statistical optimization is made by considering the covariance matrix of these samples. An eigenvalues system is obtained and solved for the optimal basis set and by inspecting the rapidly decreasing eigenvalues one may seriously reduce the necessary number of vectors that insures an imposed precision. This leads to a potentially significant improvement in the speed of the SCF calculations and accuracy, as the statistical properties of a large number of wave functions in an large spatial domain may be considered. The eigenvalue problem has to be solved only few times, so that the amount of time added may be much smaller that the overall iterating SCF calculations. A simple implementation of the method is presented for a situation where the analytical solution is known, and the results are encouraging.
Vintan, Lucian N.
Next Location Prediction Within a Smart Office Building Jan Petzold, Faruk Bagci, Wolfgang Trumler is notified about the probable next location of an absent office owner within a smart office building the efficiency of several prediction methods. The scenario concerns employees in an office building visiting
Sebe, Nicu
's motto, "More human than human", serves as the basis for exploring the human experience through true listens. Reeves and Nass1 have conducted several experiments of classical human-human interaction, taking enabled human users to interact with computers in ways previously unimag- inable. Beyond the confines
Wang, Weiguo; Davis, Kenneth J.
2008-09-03T23:59:59.000Z
We compare the contributions of unit source fluxes over a clear-cutting area in a forest and over the contiguous forested area to the eddy-covariance (EC) flux of CO2 measured at a tower standing in the center of the clearcut under daytime convective conditions. The large-eddy simulation (LES) technique is used to simulate the dispersion and transport of two conservative and passive tracers that are released from the clearcut and from the forested area, respectively. The time series of the LES-generated vertical velocity and the mixing ratios of both tracers on all the levels at the tower location are recorded every model time step during the last hour of each LES run; this somewhat mimics real EC flux measurements at the tower. The contribution of the unit surface flux over the clearcut relative to that over the forested area decreases exponentially with increasing measurement height, decreasing convective boundary layer depth, increasing atmospheric stability, and decreasing size of the clearcut. LES-derived results are fitted to an empirical relation and applied to flux measurements at the 447-m tall tower in Wisconsin, USA. The contribution of the unit flux over the clearcut on the EC flux measured at the 30-m level of the tower is larger than 50% of that over the forested area under most unstable conditions, while smaller than 2.5% at the 396-m level. Existing analytical footprint models are inappropriate to address the clearcut influence due to clearcut-induced heterogeneity of the turbulent flow in the tower area.
Density-dependent covariant energy density functionals
Lalazissis, G. A. [Physics Department, Aristotle University of Thessaloniki, GR-54124 (Greece)
2012-10-20T23:59:59.000Z
Relativistic nuclear energy density functionals are applied to the description of a variety of nuclear structure phenomena at and away fromstability line. Isoscalar monopole, isovector dipole and isoscalar quadrupole giant resonances are calculated using fully self-consistent relativistic quasiparticle randomphase approximation, based on the relativistic Hartree-Bogoliubovmodel. The impact of pairing correlations on the fission barriers in heavy and superheavy nuclei is examined. The role of pion in constructing desnity functionals is also investigated.
Generalized score tests for missing covariate data
Jin, Lei
2009-05-15T23:59:59.000Z
. . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.2 The Case of the Selection Probability pi Being Known and ? Being Given . . . . . . . . . . . . . . . . . . . . . . 21 3.3 Parametric Setting . . . . . . . . . . . . . . . . . . . . . . 27 3.4 Semiparametric Setting... in Scharfstein, Rotnitzky, and Robins, 1999; Van der Laan and Robins, 2003, Ibrahim, Chen, Lipsitz, and Herring, 2005). Considering n independent observations, Robins et al. (1994) proposed the gen- eral weighted estimating equations (WEEs) U(?,pi...
CONSTRUCTION OF COVARIANCE MATRICES WITH A ...
2009-05-28T23:59:59.000Z
matrices is a first step in Monte Carlo studies of statistical inferences of misspecified models. We analyze ...... American Statistical Association, 81, 142-
Covariance Estimation for High Dimensional Data Vectors
!Prior Model diag(Et SE){ } ^" = diag( ^Et S ^E) #12;2/22/09 Prior Model: The Sparse Matrix Transform (SMT;2/22/09 SMT is product of Givens rotations: So the SMT is a generalization of the FFT SMT is also a generalization of orthonormal (paraunitary) wavelets SMT is a Generalization of the FFT and Orthonormal Wavelet
Smooth Optimization Approach for Covariance Selection ?
2007-07-03T23:59:59.000Z
Jun 30, 2007 ... eigenvalues of the solution. Acknowledgement. The author would like to thank Professor Alexandre d'Aspremont for a careful discussion on.
de Villiers, Marienne
February) within Nigeria WILL CRESSWELL1, MARK BOYD2 & MATT STEVENS1 1AP Leventis Ornithological Research Institute, Jos, Nigeria & School of Biology, University of St Andrews, Fife, Scotland. wrlc@st-and.ac.uk 2Afrotropical bird species during the dry season (NovemberFebruary) within Nigeria. pp. 1828. In: Harebottle, D
Annales Geophysicae (2005) 23: 4753 SRef-ID: 1432-0576/ag/2005-23-47
Paris-Sud XI, Université de
2005-01-01T23:59:59.000Z
Frequency Active Auroral Research Program (HAARP) heating facility are analyzed. We propose a theo- retical
Land use, food production, and the future of tropical forest species in Ghana
Phalan, Benjamin Timothy
2010-07-06T23:59:59.000Z
by discussions with Brigid Barry, David Bowden, Lauren Coad, Nigel Collar, Paul Donald, Rob Ewers, Vicky Jones, Val Kapos, Eric Keys, Deborah Lawrence, Tasso Leventis, Ken Norris, Debbie Pain, Hugo Rainey, B. L. Turner and Juliet Vickery. Thanks to John... in a wildlife protected area, although I ended up working only in forest reserves. I thank Moses Sam and Phil Marshall for interesting discussions, and Kofi Affum-Baffo, Francis Agurgo, Edward Obiaw and Oheneba Amponsah Agyemang of the Resource...
Alternatives to traditional model comparison strategies for covariance structure models
Preacher, K. J.; Cai, Li; MacCallum, R. C.
2007-01-01T23:59:59.000Z
involving an extension of recently introduced methods to nested model scenarios. Following our discussion of power, we further explore the potential value of adopting a model selection approach that avoids hypoth- a105 ?Chapter3?Preacher? ? 2007/2/12 ? 15... is literally true, there is an obvious logical problem in testing the null hypothesis that a model fits data perfectly in the population. Yet, this is precisely the hypothesis tested by the popular LR test of model a105 ?Chapter3?Preacher? ? 2007/2/12 ? 15...
Ensemble Statistics and Error Covariance of a Rapidly Intensifying Hurricane
Rigney, Matthew C.
2010-01-16T23:59:59.000Z
and the underlying dynamics for the case of Hurricane Humberto. Using an Ensemble Kalman Filter (EnKF), a comparison of data assimilation results in Storm-centered and Eulerian coordinate systems is made. In addition, the extent of the non-Gaussianity of the model...
Magnetic and antimagnetic rotation in covariant density functional theory
Zhao, P. W.; Liang, H. Z.; Peng, J.; Ring, P.; Zhang, S. Q.; Meng, J. [State Key Lab Nucl. Phys. and Tech., School of Physics, Peking University, Beijing 100871 (China); Department of Physics, Beijing Normal University, Beijing 100875 (China); State Key Lab Nucl. Phys. and Tech., School of Physics, Peking University, Beijing 100871 (China) and Physik Department, Technische Universitat Muenchen, D-85747 Garching (Germany); State Key Lab Nucl. Phys. and Tech., School of Physics, Peking University, Beijing 100871 (China); State Key Lab Nucl. Phys. and Tech., School of Physics, Peking University, Beijing 100871 (China) and Department of Physics, University of Stellenbosch, Stellenbosch (South Africa)
2012-10-20T23:59:59.000Z
Progress on microscopic and self-consistent description of the magnetic rotation and antimagnetic rotation phenomena in tilted axis cranking relativistic mean-field theory based on a point-coupling interaction are briefly reviewed. In particular, the microscopic pictures of the shears mechanism in {sup 60}Ni and the two shears-like mechanism in {sup 105}Cd are discussed.
Mean and covariance matrix adaptive estimation for a weakly ...
2011-01-25T23:59:59.000Z
AMS 2000 subject classification: Primary: 62G05, 62M10; Secondary: 90C15. Key words and phrases: Adaptive estimation, weakly stationary process, stochastic ...
Sensitivity analysis and calibration of the covariance matrix for ...
2011-01-25T23:59:59.000Z
[Mar52] and of a generalisation of this problem taking into account the ..... thus of interest to consider model (B) above which is more realistic for stock returns on.
adapting covariance propagation: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
the excitation H(cal D,cal H) and the field strength F(E,B). We study the propagation of electromagnetic waves in such a spacetime by Hadamard's method and arrive,...
Estimation in Covariate Adjusted Regression Damla Senturk1
Sentürk, Damla
confounder in a multiplicative fashion. One example is data collected for a study on diabetes, where adjusted for the effects of the confounders. One example is data collected for a study on diabetes (Willems for diabetes, including cholesterol and hypertension, and diagnostic variables, such as glycosolated hemoglobin
CPM: A Covariance-preserving Projection Method Ravi Janardan
Ye, Jieping
Introduction Linear Discriminant Analysis (LDA) [4, 7, 8] is a well-known scheme for feature extraction Discriminant Analysis (LDA), Sliced Average Variance Estimator (SAVE), and Heteroscedastic Discriminant Analysis (HDA). This gives us new insights into the na- ture of these different algorithms. We use both
Parameters’ Covariance in Neutron Time of Flight Analysis – Explicit Formulae
Odyniec, M. [NSTec; Blair, J. [NSTec
2014-12-01T23:59:59.000Z
We present here a method that estimates the parameters’ variance in a parametric model for neutron time of flight (NToF). The analytical formulae for parameter variances, obtained independently of calculation of parameter values from measured data, express the variances in terms of the choice, settings, and placement of the detector and the oscilloscope. Consequently, the method can serve as a tool in planning a measurement setup.
Newton-Like Methods for Sparse Inverse Covariance Estimation
2012-06-07T23:59:59.000Z
Jun 7, 2012 ... Economy of computation is achieved in this method by .... Globalization: Choose Pk+1 by perform- ing an Armijo backtracking line search.
General Treatment of All 2d Covariant Models
W. Kummer
1996-12-06T23:59:59.000Z
General matterless models of gravity include dilaton gravity, arbitrary powers in curvature, but also dynamical torsion. They are a special class of "Poisson-sigma-models" whose solutions are known completely, together with their general global structure. Beside the ordinary black hole, arbitrary singularity structures can be studied. It is also possible to derive an action "backwards", starting from a given manifold. The role of conservation laws, Noether charge and the quantization have been investigated. Scalar and fermionic matter fields may be included as well.
Conserved Quasilocal Quantities and General Covariant Theories in Two Dimensions
W. Kummer; P. Widerin
1995-02-15T23:59:59.000Z
General matterless--theories in 1+1 dimensions include dilaton gravity, Yang--Mills theory as well as non--Einsteinian gravity with dynamical torsion and higher power gravity, and even models of spherically symmetric d = 4 General Relativity. Their recent identification as special cases of 'Poisson--sigma--models' with simple general solution in an arbitrary gauge, allows a comprehensive discussion of the relation between the known absolutely conserved quantities in all those cases and Noether charges, resp. notions of quasilocal 'energy--momentum'. In contrast to Noether like quantities, quasilocal energy definitions require some sort of 'asymptotics' to allow an interpretation as a (gauge--independent) observable. Dilaton gravitation, although a little different in detail, shares this property with the other cases. We also present a simple generalization of the absolute conservation law for the case of interactions with matter of any type.
Covariant Spectator Theory of np scattering: Deuteron Quadrupole Moment
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Gross, Franz
2015-01-01T23:59:59.000Z
The deuteron quadrupole moment is calculated using two CST model wave functions obtained from the 2007 high precision fits to np scattering data. Included in the calculation are a new class of isoscalar np interaction currents automatically generated by the nuclear force model used in these fits. The prediction for model WJC-1, with larger relativistic P-state components, is 2.5% smaller that the experiential result, in common with the inability of models prior to 2014 to predict this important quantity. However, model WJC-2, with very small P-state components, gives agreement to better than 1%, similar to the results obtained recently from chiral effect field theory predictions to order next-to-next-to-next-to-leading order.
A Brief Practical Guide to Eddy Covariance Flux
Noone, David
Emissions Greenhouse Gases Oil and Gas Industry Carbon Sequestration Environmental Monitoring G. Burba and D, network guidelines and journal papers. It is also intended to help students and researchers in the field - open pathLI-7700 CH4 gas analyzer 46 - enclosed LI-7200 gas analyzer 53 - closed-path LI-7000 gas
Conformally covariant boundary correlation functions with a quantum group
Kalle Kytölä; Eveliina Peltola
2014-10-23T23:59:59.000Z
Particular boundary correlation functions of conformal field theory are needed to answer some questions related to random conformally invariant curves known as Schramm-Loewner evolutions (SLE). In this article, we introduce a correspondence and establish its fundamental properties, which are used in companion articles for explicitly solving two such problems. The correspondence associates Coulomb gas type integrals to vectors in a tensor product representation of a quantum group, a q-deformation of the Lie algebra sl2. We show that desired properties of the functions are guaranteed by natural representation theoretical properties of the vectors.
Mean and Covariance Structure Analysis of Hierarchical Data
Bengt O. Muthén
2011-01-01T23:59:59.000Z
are g H d ' = ^ z ' ^ g ® »V S = symmetric d lNg where I N Ng ® £yz lNg ® 2w is an identity matrixof dimension N , l g + lNg lNg' ® N g is a unit vector of
and the eddy-covariance system and meteorological station were
in tropical plantations (rubber-tree, coco- nut-tree, coffee and eucalypt plantations) managed by the CIRAD the ecosystem and the atmos- phere, ii) identifying the main regulators of gross and net pri- mary production (GPP, NPP) and net ecosystem production (NEP), and iii) parameterizing/ validating ecosystem process
SST spatial anisotropic covariances from METOP-AVHRR data
Boyer, Edmond
of SST data to track, characterize and reconstruct mesoscale dynamics (cf. Klein et al. (2009); Isern et and modeling of mesoscale SST variability appears crucial to provide interpolation priors. The temporal)). However, to our knowledge, no study has explored thor- oughly at a global-scale these mesoscale spatial
aquatic habitat covariates: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
habitat Hofmann, Hans A. 15 Aquatic Habitat Modifications in La Plata River Basin, Patagonia and Associated Marine Areas CiteSeer Summary: This paper describes the environmental...
Sample covariance based estimation of Capon algorithm error probabilities
Richmond, Christ D.
The method of interval estimation (MIE) provides a strategy for mean squared error (MSE) prediction of algorithm performance at low signal-to-noise ratios (SNR) below estimation threshold where asymptotic predictions fail. ...
Localizing Search Using Covariance Jason Galbraith, Seth Pellegrino, Peter Drake
Drake, Peter
-208 (2007). Gelly, S. & Silver, D. Combining online and offline knowledge in UCT. In International. Bandit based monte-carlo planning. In ECML-06 (2006). We'd also like to thank the Willamette Valley REU
Generally covariant quantum mechanics on noncommutative configuration spaces
Kopf, Tomas; Paschke, Mario [Mathematical Institute, Silesian University, Na Rybnicku 1, 74601 Opava (Czech Republic); Institut fuer Mathematik, Einsteinstrasse 62, 48149 Muenster (Germany)
2007-11-15T23:59:59.000Z
We generalize the previously given algebraic version of 'Feynman's proof of Maxwell's equations' to noncommutative configuration spaces. By doing so, we also obtain an axiomatic formulation of nonrelativistic quantum mechanics over such spaces, which, in contrast to most examples discussed in the literature, does not rely on a distinguished set of coordinates. We give a detailed account of several examples, e.g., C{sup {infinity}}(Q)xM{sub n}(C) which leads to non-Abelian Yang-Mills theories, and of noncommutative tori T{sub {theta}}{sup d}. Moreover, we examine models over the Moyal-deformed plane R{sub {theta}}{sup 2}. Assuming the conservation of electrical charges, we show that in this case the canonical uncertainty relation [x{sub k},x{sub l}]=ig{sub kl} with metric g{sub kl} is only consistent if g{sub kl} is constant.
Covariant Spectator Theory of np scattering: Deuteron Quadrupole Moment
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Gross, Franz
2015-01-01T23:59:59.000Z
The deuteron quadrupole moment is calculated using two CST model wave functions obtained from the 2007 high precision fits to np scattering data. Included in the calculation are a new class of isoscalar np interaction currents automatically generated by the nuclear force model used in these fits. The prediction for model WJC-1, with larger relativistic P-state components, is 2.5% smaller that the experiential result, in common with the inability of models prior to 2014 to predict this important quantity. However, model WJC-2, with very small P-state components, gives agreement to better than 1%, similar to the results obtained recently frommore »chiral effect field theory predictions to order next-to-next-to-next-to-leading order.« less
Common Component Analysis for Multiple Covariance Matrices Technical Report
Banerjee, Arindam
real stock market datasets, where major financial events can be visualized in low dimensions. 1 preserving as much of the "energy" or variance as possible. The problem can be solved by an eigenvalue subspaces. Examples include stock market data where financial shocks and volatility arise from different
Odometry Error Covariance Estimation for Two Wheel Robot Vehicles
Robotics Research Centre Department of Electrical and Computer Systems Engineering Monash University Technical Report MECSE-95-1 1995 ABSTRACT This technical report develops a simple statistical error model of the robot. Other paths can be composed of short segments of constant curvature arcs without great loss
Parceling the Picturesque: "Rural" Cemeteries and Urban Context
Wunsch, Aaron Vickers
2009-01-01T23:59:59.000Z
the Session of 1836-1837. Harrisburg, PA: Theo. Fenn, 1837.of an American City. Harrisburg, PA: Stackpole Books,the Session of 1836-1837 (Harrisburg: Theo. Fenn, 1837), 16.
Contributions `a l'analyse qualitative symbolique effective des syst`emes dynamiques;
Paris-Sud XI, Université de
wants to live." Letter to Theo van Gogh Nuenen, April 11 th, 1885 Vincent van Gogh tel-00458959,version1
amerikaanse lng-projecten zetten: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
amerikaanse lng-projecten zetten First Page Previous Page 1 Next Page Last Page Topic Index 1 Verschenen: Lans Bovenberg, Jean Frijn, Kees Goudswaard en Theo Nijman, 'Sociale...
COLLEGE OF SCIENCE Nanoscience
Crawford, T. Daniel
- consumer electronics, personal care products, clothing, and even solar panels. Nanoscience lies of profound theo- retical insights, advances in scientific in- strumentation, and massive computing power, we
Trajectories of Human Multi-Joint Arm Movements: Evidence of Joint Level Planning
Flanagan, Randy
the ma\\;imum-smoothncs% theoF car successfull> descti'be tne ua!ectories of human point-:o-porn: honzonta
Covariant density functional theory with two-phonon coupling in nuclei
Ring, P.; Litvinova, E.; Tselyaev, V. [Physik Department, Technische Universitat Muenchen, D-85747 Garching (Germany) and State Key Lab Nucl. Phys. and Tech., School of Physics, Peking University, Beijing 100871 (China); GSI Helmholtzzentrum fuer Schwerionenforschung, 64291 Darmstadt (Germany); Nuclear Physics Department, St. Petersburg State University, 198504 St. Petersburg (Russian Federation)
2012-10-20T23:59:59.000Z
A full description of excited states within the framework of density functional theory requires energy dependent self energies. We present a new class of many-body models. It allows a parameter free description of the fragmentation of nuclear states induced by mode coupling of two-quasiparticle and two-phonon configurations. The method is applied for an investigation of low-lying dipole excitations in Sn isotopes with large neutron excess.
Estimation and testing in targeted goup sequential covariate-adjusted randomized clinical trials
Boyer, Edmond
that A is binary and that Y is one-dimensional. Typical parameters of scientific interest are + = E{E(Y |A = 1, W) - E(Y |A = 0, W)} (additive scale, which we consider hereafter) or Ã? = log E{E(Y |A = 1, W)} - log E
A general purpose program for the analysis of variance and the complete analysis of covariance
Strange, James Reid
1967-01-01T23:59:59.000Z
10 2. 3 The Mean Square Operation 3. la Completely Randomized Experiment 13 16 3. lb a'x b Factorial 16 3. 2a Repeated Observations Within a Randomized Block 17 3. 2b a x b x c Factorial 17 3. 3 Randomized Block with Factorial Treatments...: Box 15: Alter cells 5 and 5' to initial values required for the operation on the next group of items. The D operation is completed For a group of items. Box 16: Step up of (factor) run count f. Box 17: Control for entering square run. Box 18...
Discrete time Markov gamma processes and time depen-dent covariates in survival analysis
Nieto Barajas, Luis E.
. Nieto-Barajas ITAM, Department of Statistics R´io Hondo 1 Mexico D.F. 01000, Mexico lnieto@itam.mx 1
Co-variability of tropical cyclones in the North Atlantic and the eastern North Pacific
Wang, Chunzai
of accumulated cyclone energy (ACE) in the ENP. Therefore, we calculate the NA and ENP ACE indices by summingCo-variability of tropical cyclones in the North Atlantic and the eastern North Pacific Chunzai; published 30 December 2009. [1] In the Western Hemisphere, tropical cyclones (TCs) can form and develop
Field-Failure Predictions Based on Failure-time Data with Dynamic Covariate Information
; Dynamic data; Lifetime data; Usage history, Warranty returns. 1 #12;1 Introduction 1.1 Background Modern products, such as automobiles, high-end copying machines, and smart phones. For products contain- ing ADCDs
T. Dereli; J. Gratus; R. W. Tucker
2006-11-09T23:59:59.000Z
Electromagnetic properties of a simple polarisable medium may be parameterised in terms of a constitutive tensor whose properties can in principle be determined by experiments in non-inertial (accelerating) frames and in the presence of weak but variable gravitational fields. After establishing some geometric notation, discussion is given to basic concepts of stress, energy and momentum in the vacuum where the useful notion of a drive form is introduced in order to associate the conservation of currents involving the flux of energy, momentum and angular momentum with spacetime isometries. The definition of the stress-energy-momentum tensor is discussed with particular reference to its symmetry based on its role as a source of relativistic gravitation. General constitutive properties of material continua are formulated in terms of spacetime tensors including those that describe magneto-electric phenomena in moving media. This leads to a formulation of a self-adjoint constitutive tensor describing, in general, inhomogeneous, anisotropic, magneto-electric bulk matter in arbitrary motion. The question of an invariant characterisation of intrinsically magneto-electric media is explored. An action principle is established to generate the phenomenological Maxwell system and the use of variational derivatives to calculate stress-energy-momentum tensors is discussed in some detail. The relation of this result to tensors proposed by Abraham and others is discussed in the concluding section where the relevance of the whole approach to experiments on matter in non-inertial environments with variable gravitational and electromagnetic fields is stressed.
BOOK REVIEWS 143 attention to covariate-conditioned average and quantile effects, along with as-
Krishnamoorthy, Kalimuthu
confidence intervals and testing hypotheses. Their method is applied to a study of the impact of crude oil prices on gasoline prices. Hendry developed the general-to-specific (GETS) procedure for model se, for example, asset prices, whose marginal distributions display strong nonnormal features such as skewness and
Covariant Spectator Theory of np scattering: Deuteron magnetic moment and form factors
Franz Gross
2014-04-06T23:59:59.000Z
The deuteron magnetic moment is calculated using two model wave functions obtained from 2007 high precision fits to $np$ scattering data. Included in the calculation are a new class of isoscalar $np$ interaction currents which are automatically generated by the nuclear force model used in these fits. After normalizing the wave functions, nearly identical predictions are obtained: model WJC-1, with larger relativistic P-state components, gives 0.863(2), while model WJC-2 with very small P-state components gives 0.864(2) These are about 1\\% larger than the measured value of the moment, 0.857 n.m., giving a new prediction for the size of the $\\rho\\pi\\gamma$ exchange, and other purely transverse interaction currents that are largely unconstrained by the nuclear dynamics. The physical significance of these results is discussed, and general formulae for the deuteron form factors, expressed in terms of deuteron wave functions and a new class of interaction current wave functions, are given.
A covariant action principle for dissipative fluid dynamics: From formalism to fundamental physics
N. Andersson; G. L. Comer
2015-05-18T23:59:59.000Z
We present a new variational framework for dissipative general relativistic fluid dynamics. The model extends the convective variational principle for multi-fluid systems to account for a range of dissipation channels. The key ingredients in the construction are i) the use of a lower dimensional matter space for each fluid component, and ii) an extended functional dependence for the associated volume forms. In an effort to make the concepts clear, the formalism is developed in steps with the model example of matter coupled to heat considered at each level. Thus we discuss a model for heat flow, derive the relativistic Navier-Stokes equations and discuss why the individual dissipative stress tensors need not be spacetime symmetric. We argue that the new formalism, which notably does not involve an expansion away from an assumed equilibrium state, provides a conceptual breakthrough in this area of research and provide an ambitious list of directions in which one may want to extend it in the future. This involves an exciting set of problems, relating to both applications and foundational issues.
Eddy-Covariance and auxiliary measurements, NGEE-Barrow, 2012-2013
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
Torn, Margaret; Billesbach, Dave; Raz-Yaseef, Naama
The EC tower is operated as part of the Next Generation Ecosystem Experiment-Arctic (NGEE) at Barrow, Alaska. The tower is collecting flux data from the beginning of the thaw season, early June, and until conditions are completely frozen, early November. The tower is equipped with a Gill R3-50 Sonic Anemometer, LI-7700 (CH4) sensor, a LI-7500A (CO2/H2O) sensor, and radiation sensors (Kipp and Zonen CNR-4 (four component radiometer), two LiCor LI-190 quantum sensors (PAR upwelling and downwelling), and a down-looking Apogee SI-111 infrared radiometer (surface temperature)). The sensors are remotely controlled, and communication with the tower allows us to retrieve information in real time.
Fryzlewicz, Piotr
Professors Fan, Liao and Mincheva for the stimu- lating and thought-provoking article. The POET estimator verify this model assumption, and secondly, whether POET offers acceptable performance if the assumption from the point of view of the usability of POET: the authors warn us that POET may perform poorly if K
Covariant Spectator Theory of np scattering: Deuteron magnetic moment and form factors
Gross, Franz L. [JLAB
2014-06-01T23:59:59.000Z
The deuteron magnetic moment is calculated using two model wave functions obtained from 2007 high precision fits to $np$ scattering data. Included in the calculation are a new class of isoscalar $np$ interaction currents which are automatically generated by the nuclear force model used in these fits. After normalizing the wave functions, nearly identical predictions are obtained: model WJC-1, with larger relativistic P-state components, gives 0.863(2), while model WJC-2 with very small $P$-state components gives 0.864(2) These are about 1\\% larger than the measured value of the moment, 0.857 n.m., giving a new prediction for the size of the $\\rho\\pi\\gamma$ exchange, and other purely transverse interaction currents that are largely unconstrained by the nuclear dynamics. The physical significance of these results is discussed, and general formulae for the deuteron form factors, expressed in terms of deuteron wave functions and a new class of interaction current wave functions, are given.
Efficient Small Area Estimation in the Presence of Measurement Error in Covariates
Singh, Trijya
2012-10-19T23:59:59.000Z
for the four estimators, yi, eYiS, bYiME, bYiSIMEX when the number of small areas is 100, measure- ment error variance Ci = 3 and 2v = 4. k is the percentage of areas having auxiliary information measured with error. : : : : : : : 52 2 Absolute value... 3 Jackknife estimates of the mean squared error of the Lohr-Ybarra estimator bYiME and the SIMEX estimator bYiSIMEX when the num- ber of small areas is 100, measurement error variance Ci = 2 and 2v = 4. k is the percentage of areas having...
Eddy covariance observations of surface leakage during shallow subsurface CO2 releases
Hilley, George
of CO2 from underground storage sites along permeable pathways such as well bores or faults is a primary a horizontal well $100 m in length and $2.5 m in depth located in an agricultural field in Bozeman, Montana leakage from geologic storage reservoirs will pose a chal- lenge owing to the large spatial and temporal
The production of temperature and salinity variance and covariance : implications for mixing
Schanze, Julian J. (Julian Johannes)
2013-01-01T23:59:59.000Z
Large-scale thermal forcing and freshwater fluxes play an essential role in setting temperature and salinity in the ocean. A number of recent estimates of the global oceanic freshwater balance as well as the global oceanic ...
Covariant energy-momentum and an uncertainty principle for general relativity
F. I. Cooperstock; M. J. Dupre
2014-10-07T23:59:59.000Z
We introduce a naturally-defined totally invariant spacetime energy expression for general relativity incorporating the contribution from gravity. The extension links seamlessly to the action integral for the gravitational field. The demand that the general expression for arbitrary systems reduces to the Tolman integral in the case of stationary bounded distributions, leads to the matter-localized Ricci integral for energy-momentum in support of the energy localization hypothesis. The role of the observer is addressed and as an extension of the special relativistic case, the field of observers comoving with the matter is seen to compute the intrinsic global energy of a system. The new localized energy supports the Bonnor claim that the Szekeres collapsing dust solutions are energy-conserving. It is suggested that in the extreme of strong gravity, the Heisenberg Uncertainty Principle be generalized in terms of spacetime energy-momentum.
Covariant propagator in AdS5 x S5 superspace
Peng Dai; Ru-Nan Huang; Warren Siegel
2010-02-10T23:59:59.000Z
We give an explicit superspace propagator for the chiral scalar field strength of 10D IIB supergravity on an AdS5 x S5 background. Because this space is conformally flat, the propagator is very simple, almost identical to that of flat space. We also give an explicit expansion over the Kaluza-Klein modes of S5. The fact that the full propagator is so much simpler suggests that, as in 2D conformal field theory, AdS/CFT calculations would be simpler without a mode expansion.
6 DoF Appearance-based Object Localization with Local Covariant Features
Jaehne, Bernd
relevant objects and estimate their full 6 DoF pose. Whi- le this task is easily handled by men, it) and geometrical methods [24], which rely on the geometrical structure of objects (provi- ded by various sensor 2. One problem is the handling of correspondences from different views/sensors in an in- tegrated
Learning covariance dynamics for path planning of UAV sensors in a large-scale dynamic environment
How, Jonathan P.
This work addresses the problem of trajectory planning for UAV sensors taking measurements of a large nonlinear system to improve estimation and prediction of such a system. The lack of perfect knowledge of the global ...
Newton-Like Methods for Sparse Inverse Covariance Peder A. Olsen
Nocedal, Jorge
of Industrial Engineering and Managment Sciences, Northwestern University. § IBM Watson Research Center. 1 #12 Watson Research Center. Department of Computer Science, University of Colorado, Boulder. Department to efficiently compute the search direction and to avoid explicitly storing the Hessian. We show that quasi
Arroyo Negrete, Elkin Rafael
2007-04-25T23:59:59.000Z
balance errors of the updated phase(s), and limitations associated with non-Gaussian permeability distribution are some of the most critical problems of the EnKF. The use of larger ensemble size may mitigate some of these problems but are prohibitively...
Yip, Yeung
2011-08-08T23:59:59.000Z
parameters (permeability, relative permeability, initial water saturation, etc) are adjusted until the production history is matched using the updated reservoir model. However, this method of utilizing only one model does not help capture the full range...
Brane structure from a scalar field in general covariant Horava-Lifshitz gravity
D. Bazeia; F. A. Brito; F. G. Costa
2015-02-03T23:59:59.000Z
In this paper we have considered the structure of the non-projectable Horava-Melby-Thompson (HMT) gravity to find braneworld scenarios. A relativistic scalar field is considered in the matter sector and we have shown how to reduce the equations of motion to first-order differential equations. In particular, we have studied thick brane solutions of both the dilatonic and Randall-Sundrum types.
Discussion of large covariance estimation by thresholding prin-cipal orthogonal complements
Shen, Haipeng
data. Journal of the American Statistical Association 103(483), 12811293. Shen, D., H. Shen, and J component of SigClust, which is very useful for testing statistical significance of clusters in high Statistical Society: Series B (Statistical Methodology) 67(3), 427444. Huang, H., Y. Liu, M. Yuan, and J. S
Eddy-covariance observations of the atmosphere-biosphere exchange of nitrogen oxides
Min, Kyung-Eun
2012-01-01T23:59:59.000Z
4.9 ± 0.2 ppm NOx in N 2 , PRAXAIR) was diluted to 3-20 ppb5.4 ppm ± 5% NO in N 2 , PRAXAIR) was diluted with zero air
The covariation of Northern Hemisphere summertime CO2 with surface temperature in boreal regions
2013-01-01T23:59:59.000Z
in the Community Earth System Model: evaluation anduncertainties in Earth system models and for diagnosing the
Six-Week Time Series Of Eddy Covariance Co2 Flux At Mammoth Mountain...
Flux At Mammoth Mountain, California- Performance Evaluation And Role Of Meteorological Forcing Abstract CO2 and heat fluxes were measured over a six-week period (09082006 to 10...
Predicting New Hampshire Indoor Radon Concentrations from geologic information and other covariates
Apte, M.G.
2011-01-01T23:59:59.000Z
about the home's construction, heating sources and usage,detached homes, that have forced-air heating, etc. A l l wehomes that use municipal water and have no forced-air heating—
Shyamoli Chaudhuri
2005-03-02T23:59:59.000Z
This is a self-contained pedagogical review of Polchinski's 1986 analysis from first principles of the Polyakov path integral based on Hawking's zeta function regularization technique for scale-invariant computations in two-dimensional quantum gravity, an approach that can be adapted to any of the perturbative string theories. In particular, we point out the physical significance of preserving both Weyl and global diffeomorphism invariance while taking the low energy field theory limit of scattering amplitudes in an open and closed string theory, giving a brief discussion of some physics applications. We review the path integral computation of the pointlike off-shell closed bosonic string propagator due to Cohen, Moore, Nelson, and Polchinski. The extension of their methodology to the case of the macroscopic loop propagator in an embedding flat spacetime geometry has been given by Chaudhuri, Chen, and Novak. We examine the macroscopic loop amplitude from the perspective of both the target spacetime massive type II supergravity theory, and the boundary state formalism of the worldsheet conformal field theory, clarifying the precise evidence it provides for a Dirichlet (-2)brane, an identification made by Chaudhuri. The appendices contain extensive detail.
Renormalization of composite operators in Yang-Mills theories using a general covariant gauge
Collins, J.C.; Scalise, R.J. (The Pennsylvania State University, Department of Physics, 104 Davey Laboratory, University Park, Pennsylvania 16802 (United States))
1994-09-15T23:59:59.000Z
Essential to QCD applications of the operator product expansion, etc., is a knowledge of those operators that mix with gauge-invariant operators. A standard theorem asserts that the renormalization matrix is triangular: Gauge-invariant operators have alien'' gauge-variant operators among their counterterms, but, with a suitably chosen basis, the necessary alien operators have only themselves as counterterms. Moreover, the alien operators are supposed to vanish in physical matrix elements. A recent calculation by Hamberg and van Neerven apparently contradicts these results. By explicit calculations with the energy-momentum tensor, we show that the problems arise because of subtle infrared singularities that appear when gluonic matrix elements are taken on shell at zero momentum transfer.
Carbon pools in Mediterranean forests: comparing eddy covariance and GOTILWA+ model results.
Gracia, Carlos
, FLUXNET, Modelling, drought-stress, Mediterranean climate Introduction Changes in regional and global of climate change, where it becomes essential to have an understanding of the future role of terrestrial climate have already been observed, and projections of climate change suggest that higher temperatures
Eddy-Covariance and auxiliary measurements, NGEE-Barrow, 2012-2013
Torn, Margaret; Billesbach, Dave; Raz-Yaseef, Naama
2014-03-24T23:59:59.000Z
The EC tower is operated as part of the Next Generation Ecosystem Experiment-Arctic (NGEE) at Barrow, Alaska. The tower is collecting flux data from the beginning of the thaw season, early June, and until conditions are completely frozen, early November. The tower is equipped with a Gill R3-50 Sonic Anemometer, LI-7700 (CH4) sensor, a LI-7500A (CO2/H2O) sensor, and radiation sensors (Kipp and Zonen CNR-4 (four component radiometer), two LiCor LI-190 quantum sensors (PAR upwelling and downwelling), and a down-looking Apogee SI-111 infrared radiometer (surface temperature)). The sensors are remotely controlled, and communication with the tower allows us to retrieve information in real time.
Niu, Sidi
Most chemical gas detection algorithms for long-wave infrared hyperspectral images assume a gas with a perfectly known spectral signature. In practice, the chemical signature is either imperfectly measured and/or exhibits ...
Comparison of models for baryon calculations in a covariant three-body Faddeev approach
Rossak, Wilhelm R.
-preserving truncation. In mesons: Chiral symmetry is formalized by AV-WTI (guarantees massless pions in the chiral limit) Symmetry-preserving truncation. In mesons: Chiral symmetry is formalized by AV-WTI (guarantees massless: Simplest realization of AV-WTI keep only vector part of qg-vertex, µ, Helios Sanchis Alepuz (University
Constraints on Covariant Horava-Lifshitz Gravity from frame-dragging experiment
Ninfa Radicella; Gaetano Lambiase; Luca Parisi; Gaetano Vilasi
2014-08-06T23:59:59.000Z
The effects of Horava-Lifshitz corrections to the gravito-magnetic field are analyzed. Solutions in the weak field, slow motion limit, referring to the motion of a satellite around the Earth are considered. The post-newtonian paradigm is used to evaluate constraints on the Horava-Lifshitz parameter space from current satellite and terrestrial experiments data. In particular, we focus on GRAVITY PROBE B, LAGEOS and the more recent LARES mission, as well as a forthcoming terrestrial project, GINGER.
Covariance Localization with the Diffusion-Based Correlation Models MAX YAREMCHUK
assumption underlying the technique. Computationally, the DL method is comparable with the NAL technique in several directions with the major objective to relax the spatial homogeneity assumption underlying multiple ensembles in the framework of the hierarchical ensemble filter technique. In the oil and gas
Six-Week Time Series Of Eddy Covariance CO2 Flux At Mammoth Mountain,
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro Industries Pvt LtdShawangunk, New York:SiG Solar GmbHKentucky:SinosolSitalcea srl Jump
Six-Week Time Series Of Eddy Covariance Co2 Flux At Mammoth Mountain,
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:Ezfeedflag JumpID-f < RAPIDâ€Ž |Rippey JumpAirPowerSilcioEthanol LLCSitka Hot
Georg A. Gottwald; Lewis Mitchell; Sebastian Reich
2011-08-30T23:59:59.000Z
We consider the problem of an ensemble Kalman filter when only partial observations are available. In particular we consider the situation where the observational space consists of variables which are directly observable with known observational error, and of variables of which only their climatic variance and mean are given. To limit the variance of the latter poorly resolved variables we derive a variance limiting Kalman filter (VLKF) in a variational setting. We analyze the variance limiting Kalman filter for a simple linear toy model and determine its range of optimal performance. We explore the variance limiting Kalman filter in an ensemble transform setting for the Lorenz-96 system, and show that incorporating the information of the variance of some un-observable variables can improve the skill and also increase the stability of the data assimilation procedure.
2009-01-01T23:59:59.000Z
estimates of annual carbon sequestration in a Sitka spruce (carbon cycling in a temperate forest: Radiocarbon-based estimates of residence times, sequestration
2009-01-01T23:59:59.000Z
based and biometric estimates of ecosystem carbon balance S.Uncertainty of annual net ecosystem productivity estimatedand par- titioning of ecosystem respiration in a southern
Babin, Marcel
-SATURATED PHOTOSYNTHESIS1 Michael J. Behrenfeld2 National Aeronautics and Space Administration, Goddard Space Flight Center, Department of Oceanography, Halifax, Nova Scotia B3 H 4J1, Canada The photosynthesis-irradiance (PE) of photosynthesis. Variability in PE curves can be separated into two categories: that associated with changes
Chen, Jiquan
(NEE), latent energy (LE), and sensible heat (H) based on remote sensing indices, climateGlobal patterns of landatmosphere fluxes of carbon dioxide, latent heat, and sensible heat derived
Politis, D N
2009-01-01T23:59:59.000Z
2003). Inference in ARCH and GARCH models with heavy-tailedinnovations Z t follow a GARCH(1,1) model. The values of the= 0.526. The values for the GARCH parameters were chosen to
2009-01-01T23:59:59.000Z
in a southern boreal aspen forest, Agric. For. Meteorol. ,water balances of a boreal aspen forest, 1994 – 2003, Global
1997-01-01T23:59:59.000Z
construction respiration estimated as 0.25 times wood NPP [construction respiration estimated as 0.25 E times foliage NPP (construction respiration was 1.6-3.6 times greater than 0.25 times wood NPP
Grigori Amosov
2006-09-09T23:59:59.000Z
Some new examples of quantum channels for which the infimum of the output entropy is additive under taking a tensor product of channels are given.
Jürgen Struckmeier
2013-03-26T23:59:59.000Z
The Lagrangians and Hamiltonians of classical field theory require to comprise gauge fields in order to be form-invariant under local gauge transformations. These gauge fields have turned out to correctly describe pertaining elementary particle interactions. In this paper, this principle is extended to require additionly the form-invariance of a classical field theory Hamiltonian under variations of the space-time curvature emerging from the gauge fields. This approach is devised on the basis of the extended canonical transformation formalism of classical field theory which allows for transformations of the space-time metric in addition to transformations of the fields. Working out the Hamiltonian that is form-invariant under extended local gauge transformations, we can dismiss the conventional requirement for gauge bosons to be massless in order for them to preserve the local gauge invariance.The emerging equation of motion for the curvature scalar turns out to be compatible with the Einstein equation in the case of a static gauge field. The emerging equation of motion for the curvature scalar R turns out to be compatible with that from a Proca system in the case of a static gauge field.
Air-sea gas exchange of CO 2 and DMS in the North Atlantic by eddy covariance
Miller, Scott D; Marandino, Christa A; De Bruyn, Warren; Saltzman, Eric S; McCormick, C.
2009-01-01T23:59:59.000Z
measurements of the air/sea flux of dimethylsulfide over the2008a), Open ocean DMS air/sea fluxes over the eastern SouthE. S. Saltzman (2008b), DMS air/sea flux and gas transfer
Guillermo F. Rubilar; Yuri N. Obukhov; Friedrich W. Hehl
2002-03-25T23:59:59.000Z
We study the {\\em propagation of electromagnetic waves} in a spacetime devoid of a metric but equipped with a {\\em linear} electromagnetic spacetime relation $H\\sim\\chi\\cdot F$. Here $H$ is the electromagnetic excitation $({\\cal D},{\\cal H})$ and $F$ the field strength $(E,B)$, whereas $\\chi$ (36 independent components) characterizes the electromagnetic permittivity/permeability of spacetime. We derive analytically the corresponding Fresnel equation and show that it is always quartic in the wave covectors. We study the `Fresnel tensor density' ${\\cal G}^{ijkl}$ as (cubic) function of $\\chi$ and identify the leading part of $\\chi$ (20 components) as indispensable for light propagation. Upon requiring electric/magnetic reciprocity of the spacetime relation, the leading part of $\\chi$ induces the {\\em light cone} structure of spacetime (9 components), i.e., the spacetime metric up to a function. The possible existence of an Abelian {\\em axion} field (1 component of $\\chi$) and/or of a {\\em skewon} field (15 components) and their effect on light propagation is discussed in some detail. The newly introduced skewon field is expected to be T-odd and related to dissipation.
Temperature field reconstruction of combustion flame based on high
that sound propagates in a different medium with different speed, and its theo- retical cornerstone-known materials of solid, liquid, and gaseous states, flame is a kind of plasma1,2 of which temper- ature is one
air flow due: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
VI 2KSTISO ISCEfIQUF" AW' P". -l CKKU% VIX AIR... Holleman, Theo Rufus 1951-01-01 35 Overheat Instability in an Ascending Moist Air Flow as a Mechanism of Hurricane Formation...
Volume 258, number 3,4 PHYSICS LETTERS B 11 April 1991 Self-regenerating inflationary universe
Cotsakis, Spiros
Volume 258, number 3,4 PHYSICS LETTERS B 11 April 1991 Self-regenerating inflationary universe~scussion of self-regenerating, self-reproducing inflationary universe in the context of higher-order gravity theo
Qualitative risk assessment for adventitious presence of unauthorized genetically modified organisms
Bohanec, Marko
organisms Martin Znidarsic1 , Marko Bohanec1,2 , Esther J. Kok3 , Theo W. Prins3 ABSTRACT The adventitious-1000 Ljubljana, Slovenia (martin.znidarsic@ijs.si, +386 1 477 3366) 2 University of Nova Gorica
EFFICIENT BASIS CHANGE AND REGULARIZATION FOR SPARSE ...
2011-09-08T23:59:59.000Z
measurement error and noise. Let x? denote the minimizer of (17). Theo- .... [4] S. Becker, J. Bobin, and E.J. Cand`es. Nesta: A fast and accurate first-order ...
aldosterone receptor antagonists: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Felix Gru n, Theo K. Bammler, Bruce Blumberg, Kenneth E. Thummel, and David L. Eaton Departments of Pharmaceutics (C.Z., K.E.T.) and Environmental cancer, and most...
a2a receptor antagonists: Topics by E-print Network
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Felix Gru n, Theo K. Bammler, Bruce Blumberg, Kenneth E. Thummel, and David L. Eaton Departments of Pharmaceutics (C.Z., K.E.T.) and Environmental cancer, and most...
at1 receptor antagonist: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Felix Gru n, Theo K. Bammler, Bruce Blumberg, Kenneth E. Thummel, and David L. Eaton Departments of Pharmaceutics (C.Z., K.E.T.) and Environmental cancer, and most...
a1 receptor antagonist: Topics by E-print Network
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Felix Gru n, Theo K. Bammler, Bruce Blumberg, Kenneth E. Thummel, and David L. Eaton Departments of Pharmaceutics (C.Z., K.E.T.) and Environmental cancer, and most...
alpha-adrenergic receptor antagonist: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Felix Gru n, Theo K. Bammler, Bruce Blumberg, Kenneth E. Thummel, and David L. Eaton Departments of Pharmaceutics (C.Z., K.E.T.) and Environmental cancer, and most...
alpha2-noradrenergic receptor antagonists: Topics by E-print...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Felix Gru n, Theo K. Bammler, Bruce Blumberg, Kenneth E. Thummel, and David L. Eaton Departments of Pharmaceutics (C.Z., K.E.T.) and Environmental cancer, and most...
a2a receptor antagonist: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Felix Gru n, Theo K. Bammler, Bruce Blumberg, Kenneth E. Thummel, and David L. Eaton Departments of Pharmaceutics (C.Z., K.E.T.) and Environmental cancer, and most...
alpha-1a receptor antagonist: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Felix Gru n, Theo K. Bammler, Bruce Blumberg, Kenneth E. Thummel, and David L. Eaton Departments of Pharmaceutics (C.Z., K.E.T.) and Environmental cancer, and most...
angiotensin receptor antagonists: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Felix Gru n, Theo K. Bammler, Bruce Blumberg, Kenneth E. Thummel, and David L. Eaton Departments of Pharmaceutics (C.Z., K.E.T.) and Environmental cancer, and most...
aii receptor antagonists: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Felix Gru n, Theo K. Bammler, Bruce Blumberg, Kenneth E. Thummel, and David L. Eaton Departments of Pharmaceutics (C.Z., K.E.T.) and Environmental cancer, and most...
Scalable SMT-Based Verification of GPU Kernel Functions School of Computing, University of Utah
Capecchi, Mario R.
Scalable SMT-Based Verification of GPU Kernel Functions Guodong Li School of Computing, University Satisfiability Modulo Theo- ries (SMT) tools, detecting bugs such as data races, in- correctly synchronized Satisfiabil- ity Modulo Theories (SMT [2
Model-Free Reconstruction of Excitatory Neuronal Connectivity from Calcium Imaging Signals
Battaglia, Demian
Stetter1,2,3 , Demian Battaglia1,3 *, Jordi Soriano4 , Theo Geisel1,2,3 1 Max Planck Institute, Battaglia D, Soriano J, Geisel T (2012) Model-Free Reconstruction of Excitatory Neuronal Connectivity from
Neural network technology for automatic fracture detection in sonic borehole image data
Schnorrenberg, Frank Theo
1992-01-01T23:59:59.000Z
NEURAL NETWORK TECHNOLOGY FOR AUTOMATIC FRACTURE DETECTION IN SONIC BOREHOLE IMAGE DATA A Thesis by FRANK THEO SCHNORRENBERG Submitted to the Office of Graduate Studies of Texas A&M University tn partial fulfillment of the requirements... for the degree of MASTER OF SC1ENCE December 1992 Major Subject: Computer Science NEURAL NETWORK TECHNOLOGY FOR AUTOMATIC FRACTURE DETECTION IN SONIC BOREHOLE IMAGE DATA A Thesis by FRANK THEO SCHNORRENBERG Subnutted to the Office of Graduate Studies...
Mallavarapu, Bravishwar
2013-01-01T23:59:59.000Z
under the ‘License Raj’ policies India’s economy grew at abase. Development policy in India needs to recognize theUrban development policy in India seems to be obsessed with
Ferrier, Ken L.
Erosion of volcanic ocean islands creates dramatic landscapes, modulates Earth’s carbon cycle, and delivers sediment to coasts and reefs. Because many volcanic islands have large climate gradients and minimal variations ...
Spang, Rainer
Clustering Exercise 1 The main difference is that GMMs are probabilistic whereas k-means are not want and hence the clusters may have any desired elliptical shapes. It can be shown that k-means in R. The function to apply k-means is kmeans. The function to apply the EM algorithm is the function
Spang, Rainer
Clustering Exercise 1 Question 1 The main difference is that GMMs are probabilistic whereas k-means be anything we want and hence the clusters may have any desired elliptical shapes. It can be shown that k-means
Zeweldi, Dawit A.; Gebremichael, Mekonnen; Wang, Junming; Sammis, Theodore; Kleissl, Jan; Miller, David
2010-01-01T23:59:59.000Z
of satellite remote sensing sensible heat-?ux estimates dueremote sensing algorithms. A typical approach identi?es spectral bands particularly sensitive to surface heat ?
Kazma, Rémi; Hoffmann, Thomas J; Witte, John S
2011-01-01T23:59:59.000Z
Hered 2010, 70:42-54. 5. Hoffmann TJ, Marini NJ, Witte JS:Rémi Kazma † , Thomas J Hoffmann † , John S Witte * FromSUP] method) proposed by Hoffmann et al. [5]. Briefly, the
Mallavarapu, Bravishwar
2013-01-01T23:59:59.000Z
2000-01, operation. and 2005-06. Factory Size Average numberlevel microdata fpr and 2005-06. Firm Formation Rate Percentlevel microdata fpr and 2005-06. Import Input Ratio of value
Comment on Quantum teleportation via GHZ-like state
Anindita Banerjee; Kamal Patel; Anirban Pathak
2010-06-08T23:59:59.000Z
Recently Yang et al. [Int. J. Theo. Phys. 48 (2009) 516] have shown that an unknown qubit can be teleported by using a particular GHZ-like state as quantum channel. However, there are several errors in the calculation which lead to incorrect conclusions. The errors have been indicated and corrected. It is also noted that their scheme and the independently proposed teleportation scheme of Zhang et al. [Int. J. Theo. Phys. 48 (2009) 3331] uses quantum channel from the same family and any state of that family may be used for teleportation.
Paderborn, Universität
Aiming to bring together media scholars from the United States, Canada, and Germany, the conference of Paderborn, Germany Concept and Organisation: Hannelore Bublitz, Irina Kaldrack, Theo Röhle, Hartmut Winkler March 29 31, 2012 University of Paderborn, Germany Room B 3.231 #12;02:00 | Start / Introduction 02
INSTITUTE PHYSICS PUBLISHING JOURNAL OF PHYSICS MATHEMATICAL GENERAL
Bartsch, Thomas
--6978 S0305Â4470(03)58228Â2 The Kustaanheimo--Stiefel transformation geometric algebra Bartsch Institut ur Theoretische Physik UniversitË? Stuttgart, Stuttgart, Germany EÂmail: bartsch@theo1.physik which avoids singularity. 0305Â4470/03/256963+16$30.00 Â© Publishing Ltd Printed6964 Bartsch one
Thole, Karen A.
Research Laboratory, WPAFB, OH 45433 An Experimental Study of Combustor Exit Profile Shapes on Endwall Heat elevated temperatures and pressures. The drive toward thermal operating conditions near theo- retical to the temperature profiles exiting combustors and enter- ing turbines becoming less peaked than in the past
Xs are for Trajectory Evaluation, Booleans are for Theorem Proving
Melham, Tom
. Aagaard,1 Thomas F. Melham,2 John W. O'Leary1 1 Strategic CAD Labs 2 FATA Research Group Intel Corporation and model checkers. #12;M. D. Aagaard, T. F. Melham and J. W. O'Leary, `Xs are for Trajec- tory Evaluation. Melham, and J. W. O'Leary, `Xs are for Trajectory Evaluation, Booleans are for Theo- rem Proving
1 One-Dimensional Magnetism Hans-Jurgen Mikeska1
Dragon, Norbert
for S=1/2 and biquadratic exchange for S=1 systems), with spin-orbital models and mixed spin in the critical and ordered phases. 1.1 Introduction The field of low-dimensional magnetism can be traced back of today's solid state physics. For the first 40 years this was an exclusively theoretical field. Theo
Surface-Based Analysis of Functional Magnetic Resonance Imaging Data
Thompson, Paul
Surface-Based Analysis of Functional Magnetic Resonance Imaging Data Theo G.M. van Erp1, Vikas Y School of Medicine, Los Angeles, CA 90095, USA Abstract. Surface-based visualization, atlases the integration of surface-based tech- niques with functional imaging data, combining surface-based nonlinear
September 1999 2131BOOK REVIEWS Ecology, 80(6), 1999, pp. 21312132
Thomas, Dave
's petroleum resources come from relic, pre-planetary sources. The prevailing theory of petroleum production theo- ries concerning the origins of petroleum hydrocarbons and the abundance of deep in the sediments of lakes and oceans. Thus, petroleum reserves should be found in sedimentary formations. Gold
K.-H. Spatschek Associate Editors
Screening Effect on Stellar Thermonuclear Fusion A. Y. Potekhin1,2 and G. Chabrier2,3 1 Ioffe Physical. In addition, we examine some recent unconventional theo- retical results on stellar thermonuclear fusionsA, Weinheim 1 Introduction Thermonuclear reactions play a crucial role in stellar evolution. Nuclear fusion
2013-01-01T23:59:59.000Z
effect on stellar thermonuclear fusion Alexander Y. Potekhin1,2 and Gilles Chabrier2,3 1 Ioffe Physical. In addition, we examine some recent unconventional theo- retical results on stellar thermonuclear fusionsA, Weinheim 1 Introduction Thermonuclear reactions play a crucial role in stellar evolution. Nuclear fusion
What is Concurrent Programming? Course Outline (Approximate) Evaluation & Deadlines Engineering 9869
Peters, Dennis
What is Concurrent Programming? Course Outline (Approximate) Evaluation & Deadlines Engineering 9869 Advanced Concurrent Programming Introduction Dennis Peters1 Fall 2007 1 Throughout this course I will be borrowing from Dr. Theo Norvell #12;What is Concurrent Programming? Course Outline (Approximate) Evaluation
Theoretical White Dwarf Spectra on Demand: E. Ringat and T. Rauch
Barnstedt, JÃ¼rgen
program for the calculation of model atmospheres of hot, compact objects. In the framework of the German Astrophysical Virtual Observatory (GAVO), theoretical spectral energy distributions (SEDs) can be downloaded via - Ca (solar abundances) and available via TheoSSA. WHITE DWARF MODEL ATMOSPHERES IN NLTE The Model
Accurate Eye Center Location through Invariant Isocentric Patterns
Gevers, Theo
1 Accurate Eye Center Location through Invariant Isocentric Patterns Roberto Valenti, Student Member, IEEE, and Theo Gevers, Member, IEEE, Abstract--Locating the center of the eyes allows for valuable information to be captured and used in a wide range of applications. Accurate eye center location
Lidar fluorosensing of mineral oil spills on the sea surface
Oldenburg, Carl von Ossietzky Universität
be discriminated from heavy fuel, and from less harmful substances like fish oil or vegetable oil, Fig. 3, whichLidar fluorosensing of mineral oil spills on the sea surface Theo Hengstermann and Rainer Reuter Airborne .fluorosensor measurements over maritime oil spills show that this method enables a sensitive
ESCA studies on recoil implanted aluminum substrates
Mallya, Narayani R.
1980-01-01T23:59:59.000Z
in Table III (p. 19). Again, the values are in excellent agreement with the theo- retical value of 0. 12. Thus, the gold secondaries do not cause sel- ective sputtering of either alum1num or oxygen in the A1203 layer. For a change 1n argon 1on dose of 1...
On Continuous Models of Computation: Towards Computing the Distance Between
Schellekens, Michel P.
with building formal, mathematical models both for aspects of the computational process and for features discuss this issue in Section 3.1. 6th Irish Workshop on Formal Methods (IWFM'03), eWiC, British Computer traditionally associated with computer science are logic and discrete mathematics, the latter including set theo
CONMOW: Condition Monitoring for Offshore Wind Farms
1 CONMOW: Condition Monitoring for Offshore Wind Farms Edwin Wiggelinkhuizen, Theo Verbruggen, Henk in practice the European project CONMOW (Condition Monitoring for Offshore Wind Farms) was started in November for Offshore Wind Farms) was started in November 2002. This paper briefly describes the CONMOW project approach
Beex, A. A. "Louis"
, and limited environmental impact. For electric- ity generation, a variety of renewable alternatives exist to achieve reliable energy systems with long-term availability, reduced environmental impact, and lower cost metallofullerene molecules with properties that theo- retically yield a two-fold increase in organic solar cell
Bell, Alexis T.
As ab initio electronic structure calculations become more accurate, inherent sources of error, facilitate reactive flux calculations. As an example we compute the dynamically corrected rate constant on which the reaction occurs. A large number of electronic structure theo- ries are available
Overcharging of Nanoparticles in Electrolyte Solutions Sathyajith Ravindran and Jianzhong Wu*
Wu, Jianzhong
. On the theoretical side, the limitations of the traditional PB approaches for repre- senting various electrostatic phenomenon is not supported by the classical electrostatic theories based on the Poisson- Boltzmann (PB from molecular simulations and experiments. More advanced statistical-mechanical theo- ries
Can photo excitations heal defects in carbon nanotubes? Yoshiyuki Miyamoto a,*, Savas Berber b
components by monitoring the response of carbon na- notubes with atomic vacancies to electronic excitations of electronic excitations in these nanostructures to be several orders of magnitude longer than in solids a concern about the perfor- mance and reliability of nanotube-based devices. Theo- retical studies showed
Evolution of an initially columnar vortex terminating normal to a no-slip wall
Lopez, John M.
Èdewadt-type spatially oscillatory boundary layer within the core region and a potential-like vortex boundary layer at large radii. The toroidal structure results from the interaction between these two boundary layers's theo- retical study only applied to the boundary layer formed away from the core, as have most other
Architectures for Hard Real-Time
Ungerer, Theo
Uhrig, Theo Ungerer1 Systems and Networking, University of Augsburg, Eichleitnerstr. 30, D-86159 of WCET 1 E-mail: {gerdes, wolf, zhang, uhrig, ungerer}@informatik.uni-augsburg.de 2 Multi-Core Execution international s.r.o. 2 Project work at University of Augsburg At University of Augsburg the main objectives
EVOLUTION SEMIGROUPS AND ROBUST STABILITY OF EVOLUTION OPERATORS ON BANACH SPACES
EVOLUTION SEMIGROUPS AND ROBUST STABILITY OF EVOLUTION OPERATORS ON BANACH SPACES Y. LATUSHKIN, S. MONTGOMERYSMITH, AND T. RANDOLPH Abstract. Using the theory of evolution semigroups, this paper investigatesmapping theo rem for evolution semigroups acting on vectorvalued functions on [0; 1) is proven first
Blumberg, Bruce
Nuclear Receptor Changcheng Zhou,1 Emma-Jane Poulton, Felix Gru¨ n, Theo K. Bammler, Bruce Blumberg, and en- dogenous sterols. Among the most important mediators of CYP3A4 expression is the nuclear hormone.Z. is supported by a University of Washington School of Pharmacy Drug Metabolism, Transporter
Optimization in SMT with LA(Q) Cost Functions Roberto Sebastiani and Silvia Tomasi
Sebastiani, Roberto
Optimization in SMT with LA(Q) Cost Functions Roberto Sebastiani and Silvia Tomasi DISI, University decision problems are effectively encoded into Satisfiability Modulo Theo- ries (SMT). In the last decade efficient SMT solvers have been developed for several theories of practical interest (e.g., linear
Working Paper Series Semantic building blocks
Fernandez, Thomas
. These results then suggest several new, theo- retically grounded, research areas. 1 Introduction SubtreeWorking Paper Series Semantic building blocks in genetic programming Nicholas Freitag Mc and Teaching Rodney A. Briggs Library Volume 3 Number 2 December 12, 2007 Faculty and Student Research
Routing for analog chip design at NXP semiconductors
Utrecht, Universiteit
Routing for analog chip design at NXP semiconductors Marjan van den Akker Theo Beelen Rob H.O. Box 80.089 3508 TB Utrecht The Netherlands #12;Routing for analog chip designs at NXP Semiconductors.1 NXP Semiconductors NXP Semiconductors N.V. (Nasdaq: NXPI) is a global semiconductor company and a long
STUDY OF THE OSCILLATION CONDITION OF QUARTZ OSCILLATORS BY GYRATOR TRANSFORMATION
Paris-Sud XI, Université de
systems. This method is based on the transformation of the nonlinear circuit into a sum of linear circuits [5][6]. Then, the resulting linear circuit can be analyzed by graph theo- retical methods to analyze elec- tronic circuits are based on the well-known modified nodal analysis (MNA) method [7
Measurement of the W Boson Mass with the D0 Run II Detector using the Electron P(T) Spectrum
Andeen, Timothy R., Jr.; /Northwestern U.
2008-06-01T23:59:59.000Z
This thesis is a description of the measurement of the W boson mass using the D0 Run II detector with 770 pb{sup -1} of p{bar p} collision data. These collisions were produced by the Tevatron at {radical}s = 1.96 TeV between 2002 and 2006. We use a sample of W {yields} e{nu} and Z {yields} ee decays to determine the W boson mass with the transverse momentum distribution of the electron and the transverse mass distribution of the boson. We measure M{sub W} = XXXXX {+-} 37 (stat.) {+-} 26 (sys. theo.) {+-} 51 (sys. exp.) MeV = XXXXX {+-} 68 MeV with the transverse momentum distribution of the electron and M{sub W} = XXXXX {+-} 28 (stat.) {+-} 17 (sys. theo.) {+-} 51 (sys. exp.) MeV = XXXXX {+-} 61 MeV with the transverse mass distribution.
JOURNAL OF SCIENCE & TECHNOLOGY No. 78A -2010 APPLICATION OF COMPUTATIONAL MODEL
Thomas, Brian G.
nng (tính theo % khi lng) mi v trí tính toán và s khuch tán ca ôxyt nhôm trong x lng là khâu quyt nh tc ca quá trình hòa tan. Tc hòa tan ca ôxyt nhôm trong x lng c xác nh da trên kt qu chy mô hình và quan n s hòa tan tp cht ôxyt nhôm vào x lng trong luyn thép. I. INTRODUCTION Modern technology makes
The effects of ego-involvement with the task upon the self-esteem/task performance relationship
Nilles, Carol Anne
1983-01-01T23:59:59.000Z
study by Cottrell (1965). Not all of the research results involving task-speci- fic self-esteem have supported Korman's consistency theo- ry, however, As previously mentioned, several studies have yielded only partial support. Cohen and Lefkowitz... are motivated to maintain consistency between their self-esteem and their task performance (Korman, 1970). The research evidence re- garding this contention has generally been mixed. While numerous studies have provided support for Korman's con- sistency...
The Organic Rankine Cycle System, Its Application to Extract Energy From Low Temperature Waste Heat
Sawyer, R. H.; Ichikawa, S.
1980-01-01T23:59:59.000Z
in a Rankine Cycle to extract The theoretical Rankine Cycle efficiency (~R) is energy from low temperature waste heat. By 1968, a defined as: 3.8 megawatt unit using R-11 refrigerant was placed in commercial operation in Japan (2) and currently ?ZR.... Figure 2 compares the theo The basic Organic Rankine Cycle may be described retical Rankine efficiency for several hydrocarbons, using the Pressure-Enthalpy Diagram of a typical fluorocarbons and water within the evaporating working fluid (R-11). (See...
Particle Energy Spectrum, Revisited from a Counting Statistics Perspective
Yuan, D., Marks, D. G., Guss, P. P.
2012-07-16T23:59:59.000Z
This document is a slide show type presentation of a new covariance estimation for gamma spectra and neutron cross section.
Characteristic hypersurfaces in a relativistic superfluid theory
B. Linet
1998-12-16T23:59:59.000Z
By discussing the Cauchy problem, we determine the covariant equation of the characteristic hypersurfaces in a relativistic superfluid theory.
doc. RNDr. Arnost Komarek, Ph.D. Dept. of Probability and Mathematical Statistics
Komarek, Arnost
Data Cars2004 (subset) Data on vehicles that were on the U.S. market in 2004. Only non-hybrid cars. Categorical Covariates 1. One categorical covariate and one-way ANOVA Data Cars2004 (subset) 101520 Drive Data Cars2004 (subset) 101520 Drive Consumption[l/100km] front rear 4x4 8 V. Categorical Covariates 1
Loi hnh trng: a ngnh, trng cng lp, i hc l trung tm nghin cu.
Hickman, Mark
chuyÃªn ngÃ nh t K toÃ¡n ti ng vt hc. S lng sinh viÃªn (nm 2012) Â· Tng s sinh viÃªn ng kÃ½ theo hc (% Sinh viÃªn ca New Zealand. Â· New Zealand lÃ t nc cÃ³ cht lng cuc sng cao c xp hng th nm trÃªn th gii (UNHDI, 2011 hng dn du lch hÃ ng u Lonely Planet. CÃ¡c xp hng quc t Â· c xp hng th 221 trong bng xp hng cht lng cÃ¡c
Basista, Jakub
2008-01-01T23:59:59.000Z
and current commentary on the vicissitudes of these women?s writing will appeal to specialists in the field. Martine Julia van Ittersum. Profit and Principle. Hugo Grotius, Natural Rughts Theories and the Rise of Dutch Power in the East Indies (1595...-European or non-Christian in- habitants. In her work Martine Julia van Ittersum presents Grotius as a theo- rist of rights and contract theories as well as a practitioner of those theories who acted as a negotiator and lawyer of Dutch colonialism and the VOC...
Buettner, John Philip
1961-01-01T23:59:59.000Z
and encouragement on each of the problems that arose during the course of this investigation. Thanks are also due The Dow Chemical Company for their grant of three months education leave and for making poss- ible the availability of the necessary courses... on the composition of vapor, liquid and solid phases in equi- librium. The information 1s of great importance in both theo- ret1cal and industrial studies . Some of the fundamental theorems in chemical thermody- namics owe their existence to phase studies...
Broader source: Energy.gov (indexed) [DOE]
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn AprilA group currentBradleyTable of Contents: AofIDAHOu r r e n t I s s u e s C uTHEo o
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D. A.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G.; Lynch, G.; Tackmann, K.; Koch, H.; Schroeder, T.; Asgeirsson, D. J.; Hearty, C.; Mattison, T. S.; McKenna, J. A.; Khan, A.; Blinov, V. E.; Buzykaev, A. R.; Druzhinin, V. P.; Golubev, V. B.; Kravchenko, E. A.; Onuchin, A. P.; Serednyakov, S. I.; Skovpen, Yu. I.; Solodov, E. P.; Todyshev, K. Yu.; Yushkov, A. N.; Bondioli, M.; Kirkby, D.; Lankford, A. J.; Mandelkern, M.; Stoker, D. P.; Atmacan, H.; Gary, J. W.; Liu, F.; Long, O.; Vitug, G. M.; Campagnari, C.; Hong, T. M.; Kovalskyi, D.; Richman, J. D.; West, C. A.; Eisner, A. M.; Kroseberg, J.; Lockman, W. S.; Martinez, A. J.; Schalk, T.; Schumm, B. A.; Seiden, A.; Cheng, C. H.; Doll, D. A.; Echenard, B.; Flood, K. T.; Hitlin, D. G.; Ongmongkolkul, P.; Porter, F. C.; Rakitin, A. Y.; Andreassen, R.; Dubrovin, M. S.; Huard, Z.; Meadows, B. T.; Sokoloff, M. D.; Sun, L.; Bloom, P. C.; Ford, W. T.; Gaz, A.; Nagel, M.; Nauenberg, U.; Smith, J. G.; Wagner, S. R.; Ayad, R.; Toki, W. H.; Spaan, B.; Kobel, M. J.; Schubert, K. R.; Schwierz, R.; Bernard, D.; Verderi, M.; Clark, P. J.; Playfer, S.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Fioravanti, E.; Garzia, I.; Luppi, E.; Munerato, M.; Negrini, M.; Petrella, A.; Piemontese, L.; Santoro, V.; Baldini-Ferroli, R.; Calcaterra, A.; de Sangro, R.; Finocchiaro, G.; Nicolaci, M.; Patteri, P.; Peruzzi, I. M.; Piccolo, M.; Rama, M.; Zallo, A.; Contri, R.; Guido, E.; Lo Vetere, M.; Monge, M. R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Bhuyan, B.; Prasad, V.; Lee, C. L.; Morii, M.; Edwards, A. J.; Adametz, A.; Marks, J.; Uwer, U.; Bernlochner, F. U.; Ebert, M.; Lacker, H. M.; Lueck, T.; Dauncey, P. D.; Tibbetts, M.; Behera, P. K.; Mallik, U.; Chen, C.; Cochran, J.; Meyer, W. T.; Prell, S.; Rosenberg, E. I.; Rubin, A. E.; Gritsan, A. V.; Guo, Z. J.; Arnaud, N.; Davier, M.; Grosdidier, G.; Le Diberder, F.; Lutz, A. M.; Malaescu, B.; Roudeau, P.; Schune, M. H.; Stocchi, A.; Wormser, G.; Lange, D. J.; Wright, D. M.; Bingham, I.; Chavez, C. A.; Coleman, J. P.; Fry, J. R.; Gabathuler, E.; Hutchcroft, D. E.; Payne, D. J.; Touramanis, C.; Bevan, A. J.; Di Lodovico, F.; Sacco, R.; Sigamani, M.; Cowan, G.; Brown, D. N.; Davis, C. L.; Denig, A. G.; Fritsch, M.; Gradl, W.; Hafner, A.; Prencipe, E.; Alwyn, K. E.; Bailey, D.; Barlow, R. J.; Jackson, G.; Lafferty, G. D.; Cenci, R.; Hamilton, B.; Jawahery, A.; Roberts, D. A.; Simi, G.; Dallapiccola, C.; Cowan, R.; Dujmic, D.; Sciolla, G.; Lindemann, D.; Patel, P. M.; Robertson, S. H.; Schram, M.; Biassoni, P.; Lazzaro, A.; Lombardo, V.; Neri, N.; Palombo, F.; Stracka, S.; Cremaldi, L.; Godang, R.; Kroeger, R.; Sonnek, P.; Summers, D. J.; Nguyen, X.; Taras, P.; De Nardo, G.; Monorchio, D.; Onorato, G.; Sciacca, C.; Raven, G.; Snoek, H. L.; Jessop, C. P.; Knoepfel, K. J.; LoSecco, J. M.; Wang, W. F.; Honscheid, K.; Kass, R.; Brau, J.; Frey, R.; Sinev, N. B.; Strom, D.; Torrence, E.; Feltresi, E.; Gagliardi, N.; Margoni, M.; Morandin, M.; Posocco, M.; Rotondo, M.; Simonetto, F.; Stroili, R.; Ben-Haim, E.; Bomben, M.; Bonneaud, G. R.; Briand, H.; Calderini, G.; Chauveau, J.; Hamon, O.; Leruste, Ph.; Marchiori, G.; Ocariz, J.; Sitt, S.; Biasini, M.; Manoni, E.; Pacetti, S.; Rossi, A.; Angelini, C.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Cervelli, A.; Forti, F.; Giorgi, M. A.; Lusiani, A.; Oberhof, B.; Paoloni, E.; Perez, A.; Rizzo, G.; Walsh, J. J.; Lopes Pegna, D.; Lu, C.; Olsen, J.; Smith, A. J. S.; Telnov, A. V.; Anulli, F.; Cavoto, G.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Gaspero, M.; Li Gioi, L.; Mazzoni, M. A.; Piredda, G.; Bünger, C.; Grünberg, O.; Hartmann, T.; Leddig, T.; Schröder, H.; Waldi, R.; Adye, T.; Olaiya, E. O.; Wilson, F. F.; Emery, S.; Hamel de Monchenault, G.; Vasseur, G.; Yèche, Ch.; Aston, D.; Bard, D. J.; Bartoldus, R.; Cartaro, C.; Convery, M. R.; Dorfan, J.; Dubois-Felsmann, G. P.; Dunwoodie, W.; Field, R. C.; Franco Sevilla, M.; Fulsom, B. G.; Gabareen, A. M.; Graham, M. T.; Grenier, P.; Hast, C.; Innes, W. R.; Kelsey, M. H.; Kim, H.; Kim, P.; Kocian, M. L.; Leith, D. W. G. S.; Lewis, P.; Li, S.; Lindquist, B.; Luitz, S.; Luth, V.; Lynch, H. L.; MacFarlane, D. B.; Muller, D. R.; Neal, H.; Nelson, S.; Ofte, I.; Perl, M.; Pulliam, T.; Ratcliff, B. N.; Roodman, A.; Salnikov, A. A.; Schindler, R. H.; Snyder, A.; Su, D.; Sullivan, M. K.; Va’vra, J.; Wagner, A. P.; Weaver, M.; Wisniewski, W. J.; Wittgen, M.; Wright, D. H.; Wulsin, H. W.; Yarritu, A. K.; Young, C. C.; Ziegler, V.; Park, W.; Purohit, M. V.; White, R. M.; Wilson, J. R.; Randle-Conde, A.; Sekula, S. J.; Bellis, M.; Benitez, J. F.; Burchat, P. R.
2012-08-01T23:59:59.000Z
We report measurements of partial branching fractions for inclusive charmless semileptonic B decays B¯¯¯?Xul?¯ and the determination of the Cabibbo–Kobayashi–Maskawa (CKM) matrix element |Vub|. The analysis is based on a sample of 467×10? ?(4S)?BB¯¯¯ decays recorded with the BABAR detector at the PEP-II e?e? storage rings. We select events in which the decay of one of the B mesons is fully reconstructed and an electron or a muon signals the semileptonic decay of the other B meson. We measure partial branching fractions ?B in several restricted regions of phase space and determine the CKM element |Vub| based on different QCD predictions. For decays with a charged lepton momentum p*l>1.0 GeV in the B meson rest frame, we obtain ?B=(1.80±0.13stat±0.15sys±0.02theo)×10?³ from a fit to the two-dimensional MX-q² distribution. Here, MX refers to the invariant mass of the final state hadron X and q² is the invariant mass squared of the charged lepton and neutrino. From this measurement we extract |Vub|=(4.33±0.24exp?±0.15theo)×10?³ as the arithmetic average of four results obtained from four different QCD predictions of the partial rate. We separately determine partial branching fractions for B¯¯¯0 and B? decays and derive a limit on the isospin breaking in B¯¯¯?Xul?¯ decays.
Neutrino-induced upward stopping muons in Super-Kamiokande
The Super-Kamiokande Collaboration
1999-12-01T23:59:59.000Z
A total of 137 upward stopping muons of minimum energy 1.6 GeV are observed by Super-Kamiokande during 516 detector live days. The measured muon flux is 0.39+/-0.04(stat.)+/-0.02(syst.)x10^{-13}cm^{-2}s^{-1}sr^{-1} compared to an expected flux of 0.73+/-0.16(theo.)x10^{-13}cm^{-2}s^{-1}sr^{-1}. Using our previously-published measurement of the upward through-going muon flux, we calculate the stopping/through-going flux ratio R}, which has less theoretical uncertainty. The measured value of R=0.22+/-0.02(stat.)+/-0.01(syst.) is significantly smaller than the value 0.37^{+0.05}_{-0.04}(theo.) expected using the best theoretical information (the probability that the measured R is a statistical fluctuation below the expected value is 0.39%). A simultaneous fitting to zenith angle distributions of upward stopping and through-going muons gives a result which is consistent with the hypothesis of neutrino oscillations with the parameters sin^2 2\\theta >0.7 and 1.5x10^{-3} Super-Kamiokande using the contained atmospheric neutrino events.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D. A.; Palano, A.; Pappagallo, M.; Eigen, G.; et al
2012-08-01T23:59:59.000Z
We report measurements of partial branching fractions for inclusive charmless semileptonic B decays B¯¯¯?Xul?¯ and the determination of the Cabibbo–Kobayashi–Maskawa (CKM) matrix element |Vub|. The analysis is based on a sample of 467×10? ?(4S)?BB¯¯¯ decays recorded with the BABAR detector at the PEP-II e?e? storage rings. We select events in which the decay of one of the B mesons is fully reconstructed and an electron or a muon signals the semileptonic decay of the other B meson. We measure partial branching fractions ?B in several restricted regions of phase space and determine the CKM element |Vub| based on different QCDmore »predictions. For decays with a charged lepton momentum p*l>1.0 GeV in the B meson rest frame, we obtain ?B=(1.80±0.13stat±0.15sys±0.02theo)×10?³ from a fit to the two-dimensional MX-q² distribution. Here, MX refers to the invariant mass of the final state hadron X and q² is the invariant mass squared of the charged lepton and neutrino. From this measurement we extract |Vub|=(4.33±0.24exp?±0.15theo)×10?³ as the arithmetic average of four results obtained from four different QCD predictions of the partial rate. We separately determine partial branching fractions for B¯¯¯0 and B? decays and derive a limit on the isospin breaking in B¯¯¯?Xul?¯ decays.« less
Abbiendi, G; Akesson, P F; Alexander, G; Anagnostou, G; Anderson, K J; Asai, S; Axen, D; Bailey, I; Barberio, E; Barillari, T; Barlow, R J; Batley, R J; Bechtle, P; Behnke, T; Bell, K W; Bell, P J; Bella, G; Bellerive, A; Benelli, G; Bethke, S; Biebel, O; Boeriu, O; Bock, P; Boutemeur, M; Braibant, S; Brown, R M; Burckhart, H J; Campana, S; Capiluppi, P; Carnegie, R K; Carter, A A; Carter, J R; Chang, C Y; Charlton, D G; Ciocca, C; Csilling, A; Cuffiani, M; Dado, S; Dallavalle, M; De Roeck, A; De Wolf, E A; Desch, K; Dienes, B; Dubbert, J; Duchovni, E; Duckeck, G; Duerdoth, I P; Etzion, E; Fabbri, F; Ferrari, P; Fiedler, F; Fleck, I; Ford, M; Frey, A; Gagnon, P; Gary, J W; Geich-Gimbel, C; Giacomelli, G; Giacomelli, P; Giunta, M; Goldberg, J; Gross, E; Grunhaus, J; Gruwe, M; Gupta, A; Hajdu, C; Hamann, M; Hanson, G G; Harel, A; Hauschild, M; Hawkes, C M; Hawkings, R; Herten, G; Heuer, R D; Hill, J C; Horvath, D; Igo-Kemenes, P; Ishii, K; Jeremie, H; Jovanovic, P; Junk, T R; Kanzaki, J; Karlen, D; Kawagoe, K; Kawamoto, T; Keeler, R K; Kellogg, R G; Kennedy, B W; Kluth, S; Kobayashi, T; Kobel, M; Komamiya, S; Kramer, T; Krasznahorkay, Jr A; Krieger, P; von Krogh, J; Kuhl, T; Kupper, M; Lafferty, G D; Landsman, H; Lanske, D; Lellouch, D; Letts, J; Levinson, L; Lillich, J; Lloyd, S L; Loebinger, F K; Lu, J; Ludwig, A; Ludwig, J; Mader, W; Marcellini, S; Martin, A J; Mashimo, T; Mattig, P; McKenna, J; McPherson, R A; Meijers, F; Menges, W; Merritt, F S; Mes, H; Meyer, N; Michelini, A; Mihara, S; Mikenberg, G; Miller, D J; Mohr, W; Mori, T; Mutter, A; Nagai, K; Nakamura, I; Nanjo, H; Neal, H A; O’Neale, S W; Oh, A; Oreglia, M J; Orito, S; Pahl, C; Pasztor, G; Pater, J R; Pilcher, J E; Pinfold, J; Plane, D E; Pooth, O; Przybycien, M; Quadt, A; Rabbertz, K; Rembser, C; Renkel, P; Roney, J M; Rossi, A M; Rozen, Y; Runge, K; Sachs, K; Saeki, T; Sarkisyan, E K G; Schaile, A D; Schaile, O; Scharff-Hansen, P; Schieck, J; Schorner-Sadenius, T; Schroder, M; Schumacher, M; Seuster, R; Shears, T G; Shen, B C; Sherwood, P; Skuja, A; Smith, A M; Sobie, R; Soldner-Rembold, S; Spano, F; Stahl, A; Strom, D; Strohmer, R; Tarem, S; Tasevsky, M; Teuscher, R; Thomson, M A; Torrence, E; Toya, D; Trigger, I; Trocsanyi, Z; Tsur, E; Turner-Watson, M F; Ueda, I; Ujvari, B; Vollmer, C F; Vannerem, P; Vertesi, R; Verzocchi, M; Voss, H; Vossebeld, J; Ward, C P; Ward, D R; Watkins, P M; Watson, A T; Watson, N K; Wells, P S; Wengler, T; Wermes, N; Wilson, G W; Wilson, J A; Wolf, G; Wyatt, T R; Yamashita, S; Zer-Zion, D; Zivkovic, L
2011-01-01T23:59:59.000Z
Hadronic event shape distributions from e+e? annihilation measured by the OPAL experiment at centre-of-mass energies between 91 GeV and 209 GeV are used to determine the strong coupling ?S. The results are based on QCD predictions complete to the next-to-next-to-leading order (NNLO), and on NNLO calculations matched to the resummed next-to-leading-log-approximation terms (NNLO+NLLA). The combined NNLO result from all variables and centre-of-mass energies is ?S(mZ0) = 0.1201 ± 0.0008(stat.) ± 0.0013(exp.) ± 0.0010(had.) ± 0.0024(theo.). while the combined NNLO+NLLA result is ?S(mZ0) = 0.1189 ± 0.0008(stat.) ± 0.0016(exp.) ± 0.0010(had.) ± 0.0036(theo.). The completeness of the NNLO and NNLO+NLLA results with respect to missing higher order contributions, studied by varying the renormalization scale, is improved compared to previous results based on NLO or NLO+NLLA predictions only. The observed energy dependence of ?S agrees with the QCD prediction of asymptotic freedom and excludes the absence o...
A Hybrid Ensemble Kalman Filter for Nonlinear Dynamics
Watanabe, Shingo
2011-02-22T23:59:59.000Z
. vii NOMENCLATURE ? Scalar weighting on regularization terms DC Data covariance matrix dM s ,C Cross-covariance matrix between data and model parameters ?C Model covariance matrix kobs,D Ensemble of the observation data obsd... Observation data vector cald Calculated or theoretical observation vector ? Noise in the data )(og Forward model operator H Measurement matrix K Absolute permeability rk Relative permeability sm Vector of static model variables dm...
A new Lagrangian dynamic reduction in field theory
François Gay-Balmaz; Tudor S. Ratiu
2014-07-01T23:59:59.000Z
For symmetric classical field theories on principal bundles there are two methods of symmetry reduction: covariant and dynamic. Assume that the classical field theory is given by a symmetric covariant Lagrangian density defined on the first jet bundle of a principal bundle. It is shown that covariant and dynamic reduction lead to equivalent equations of motion. This is achieved by constructing a new Lagrangian defined on an infinite dimensional space which turns out to be gauge group invariant.
Seiberg-Witten maps and commutator anomalies in noncommutative electrodynamics
Banerjee, Rabin; Kumar, Kuldeep [S.N. Bose National Centre for Basic Sciences, JD Block, Sector 3, Salt Lake, Kolkata 700098 (India)
2005-10-15T23:59:59.000Z
We exploit the Seiberg-Witten maps for fields and currents in a U(1) gauge theory relating the noncommutative and commutative (usual) descriptions to obtain the O({theta}) structure of the commutator anomalies in noncommutative electrodynamics. These commutators involve the (covariant) current-current algebra and the (covariant) current-field algebra. We also establish the compatibility of the anomalous commutators with the noncommutative covariant anomaly through the use of certain consistency conditions derived here.
Residential Use of Building Integrated Photo Voltaics
Balabadhrapatruni, Aswini
2012-07-16T23:59:59.000Z
in this model as co-variates. The results of this test indicate that both climatic zone and HDD have an effect on total energy savings....
Near-Surface Co2 Monitoring And Analysis To Detect Hidden Geothermal...
Available technologies for monitoring CO2 in the near-surface environment include the infrared gas analyzer, the accumulation chamber method, the eddy covariance method,...
An International Survey of Electric Storage Tank Water Heater Efficiency and Standards
Johnson, Alissa
2013-01-01T23:59:59.000Z
Covary, and Xia, “Energy Efficiency Country Study: Republicand Energy, “Energy Efficiency Strategy of the Republic ofin support of the Super-efficient Equipment and Appliance
accelerator configuration management: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
recurrence satisfied by the Stirling numbers of the second kind. Abrams, Aaron; Hower, Valerie 2010-01-01 198 Covariant Uniform Acceleration Physics (arXiv) Summary: We...
Grouping and Dimensionality Reduction by Locally Linear Embedding
Elkan, Charles
. - - = ml lm k jk j C C w , 1 1 =j kjk wC 1 Note: If the covariance matrix is singular or nearly singular
A polynomial case of cardinality constrained quadratic optimization ...
2010-08-27T23:59:59.000Z
Aug 27, 2010 ... In the context of subset selection problem, Das and Kempe [5] proposed an approximate algorithm for the case where the covariance ...
Energy Efficient Refrigerators Incentive Program Options for South Africa
Can, Stephane de la Rue du
2014-01-01T23:59:59.000Z
Covary, Unlimited Energy, South Africa and Paul Waide, WaideCA 94720 Unlimited Energy 2 South Africa Waide Strategicof refrigerator energy efficiency for South Africa. The
accurate mass metabolomics: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
peaks to identifying interpretable associations between experimental covariates and multivariate changes Kaski, Samuel 7 1 Hypothesis building by plant metabolomic analysis...
applying generalized stochastic: Topics by E-print Network
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GENERATORS Rick Katz Institute for Study Weather Generators (2) Generalized Linear Models (GLMs) (3) GLM Weather Generator (4) Application to Daily ("Covariates") Not...
Hanson, Andrew J.
2011-01-01T23:59:59.000Z
torsion-free spacetime would correspond to the field-freeField Strength Covariant Constant Object Meissner Effect Topological Object Enclosing Manifold Inside Vortex Vortex Map Torsion
Characterizing orbit uncertainty due to atmospheric uncertainty
Wilkins, Matthew Paul
2000-01-01T23:59:59.000Z
is implemented to model errors in the atmospheric density model. This study shows that the Kalman filter computes a believable and more realistic covariance....
Sample size for logistic regression with small response probability
Whittemore, A S
1980-03-01T23:59:59.000Z
The Fisher information matrix for the estimated parameters in a multiple logistic regression can be approximated by the augmented Hessian matrix of the moment generating function for the covariates. The approximation is valid when the probability of response is small. With its use one can obtain a simple closed form estimate of the asymptotic covariance matrix of the maximum likelihood parameter estimates, and thus approximate sample sizes needed to test hypotheses about the parameters. The method is developed for selected distributions of a single covariate, and for a class of exponential-type distributions of several covariates. It is illustrated with an example concerning risk factors for coronary heart disease.
Residential Use of Building Integrated Photo Voltaics
Balabadhrapatruni, Aswini
2012-07-16T23:59:59.000Z
in this model as co-variates. The results of this test indicate that both climatic zone and HDD have an effect on total energy savings....
Nonparametric methods for learning from data
Sajama
2006-01-01T23:59:59.000Z
Mixture discriminant analysis (MDA) [35] generalizes LDA bycommon covariance matrix. In MDA, like in LDA, all the meansdiscriminant analysis (MDA) [35] which generalizes LDA by
axial-vector matrix elements: Topics by E-print Network
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creation model. Eef van Beveren 2006-02-28 47 Nuclear matrix elements in neutrinoless double beta decay: beyond mean-field covariant density functional theory Nuclear Experiment...
The effects of mortality and health inequalities over disparities in political behavior
Rodriguez, Javier M.
2012-01-01T23:59:59.000Z
covariates related to survival. In theory, participation (3 In theory, by matching on the probability of survival, totheory equal for everyone) and to (2) the probability of survival
approximate mesoscale information: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
properly matching the input covariances to the dependence structure of the noise may lead to almost noiseless information transfer, even for intermediate values of the noise...
Functions and the Unity of Mathematics
1910-30-12T23:59:59.000Z
We examine the successes of Law of Vector Fields. We show how it gives a ...... of observers, then the covariant derivative a represents the field of ”gravitational.
airborne flux measurements: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
covariance (EC) flux measurements of the atmospheresurface exchange of gases over an urban area are a direct way to improve and evaluate emissions inventories, and, in turn, to...
aromatics saturation opening: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
the covariant bound can be saturated but not violated. As a corollary, we find that the maximum observable matter and radiation entropy in universes with positive (negative)...
autoregressive spectral estimation: Topics by E-print Network
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Estimation: A Tunable High-Resolution Spectral Estimator CiteSeer Summary: Traditional maximum entropy spectral estimation determines a power spectrum from covariance estimates....
Impact of access rates on the performance of networks
Ayesta, Urtzi
1 221111 21 1 221111 21 1 11 1 )()( )( ppppp p ppp p ppp p r #12;Covariance: C=1,r2=0.8 #12 class is binding · All covariances are positive 0 1 ** * * ppp p 0 1 **0000 0* 00* > + -= ii i i ppp p #12;Common class binding:r0=1,r2=0.05 #12;NS simulation
Optimal Pair Matching With Two Control Groups
Rosenbaum, Paul R.
Professor, Center for Statistical Sciences, Brown University, Providence, RI 02912 (E-mail: bolu@stat.brown covariate (Campbell 1969; Rosenbaum 1987, 2002a, sec. 8; Meyer 1995; Shadish, Cook, and Campbell 2002). Campbell argued that one should select two control groups to systematically vary an unobserved covariate
Input Design for Nonlinear Stochastic Dynamic Systems -A Particle Filter
Schön, Thomas
Input Design for Nonlinear Stochastic Dynamic Systems - A Particle Filter Approach R. Bhushan in nonlinear stochastic dynamic systems. The approach relies on minimizing a function of the covariance]). There has also been work done on obtaining finite sam- ple covariance estimates (Weyer et al. [1999], Weyer
The University of Chicago Department of Statistics
Stephens, Matthew
. The propensity score, defined as the conditional probability of receiving treatment given pretreatment covariates pretreatment covariates. The effect of the treatment can then be evaluated on these groups of matched units using data from a pilot study for the media campaign evaluation. 12/13/01 #12;
Eect Modi...cation and Design Sensitivity in Observational Studies
Small, Dylan
adjusting for measured pretreatment covariates, perhaps by matching, a sensitivity analysis determines a treatment and a pretreatment covariate controlled by matching, so that the treatment e¤ect is larger at some discovered empirically in the data at hand. In case (i), subgroup speci...c bounds on P-values are combined
Closed string field theory in a-gauge
Masako Asano; Mitsuhiro Kato
2012-09-09T23:59:59.000Z
We show that a-gauge, a class of covariant gauges developed for bosonic open string field theory, is consistently applied to the closed string field theory. A covariantly gauge-fixed action of massless fields can be systematically derived from a-gauge-fixed action of string field theory.
Spatial variability in soil heat flux at three Inner Mongolia steppe ecosystems
Chen, Jiquan
Spatial variability in soil heat flux at three Inner Mongolia steppe ecosystems Changliang Shao a-covariance Grassland Inner Mongolia a b s t r a c t Closing the energy budget at flux measurement sites is problematic system within the footprints of three Eddy-covariance towers located in the steppe of Inner Mongolia
Alberto Escalante
2006-07-13T23:59:59.000Z
Using a strongly covariant formalism given by Carter for the deformations dynamics of p-branes in a curved background and a covariant and gauge invariant geometric structure constructed on the corresponding Witten's phase space, we identify the canonical variables for Dirac-Nambu-Goto [DNG] and Gauss-Bonnet [GB] system in string theory. Future extensions of the present results are outlined.
Influence of fundamental frequency on stop-consonant voicing perception
Holt, Lori L.
is that this perceptual pattern arises due to experience with f0/VOT covariation. To test the first hypothesis, chinchilla chinchilla results with no significant effect of f0. For the other groups, responses followed the experienced pattern of covariation. Coupled with the chinchilla data, these results suggest f0 does not exert
Breaking the challenge of signal integrity using time-domain spoof surface plasmon polaritons
Zhang, Hao Chi; Zhang, Qian; Fan, Yifeng; Fu, Xiaojian
2015-01-01T23:59:59.000Z
In modern integrated circuits and wireless communication systems/devices, three key features need to be solved simultaneously to reach higher performance and more compact size: signal integrity, interference suppression, and miniaturization. However, the above-mentioned requests are almost contradictory using the traditional techniques. To overcome this challenge, here we propose time-domain spoof surface plasmon polaritons (SPPs) as the carrier of signals. By designing a special plasmonic waveguide constructed by printing two narrow corrugated metallic strips on the top and bottom surfaces of a dielectric substrate with mirror symmetry, we show that spoof SPPs are supported from very low frequency to the cutoff frequency with strong subwavelength effects, which can be converted to the time-domain SPPs. When two such plasmonic waveguides are tightly packed with deep-subwavelength separation, which commonly happens in the integrated circuits and wireless communications due to limited space, we demonstrate theo...
Spline functions and extremal problems
Kmiecik, Dolores
1973-01-01T23:59:59.000Z
operation. THEOREM 1. 2. Let f, g I Ll such that f and g are even functions. Then f s g is an even function. PROOF. Applying the definition, f W g(-x) = $ f(-x-t)g(t)dt = S f(x+t)g(t)dt = Sf(T) g(T-x)dT $ f (T) g(x-T)dT el g + f(x) = f a g(x). THEO... define the Fourier transform of f, denoted by f as (4) f(x) = ( e f(t)dt. THEOREM 1. 4. Let f, g f Ll. Then PROOF. Applying (4), we have f ? g(x) = Ie (f + g) (t)? f + g(x) = $ e dt ( f(t-u)g(u)du $g(u)du I f(t-u)e dt 5 g(u)du j f(T)e ~ )dT 4 Sg...
Synthesis and characterization of an n-butylphosphotriester of adenosine 3',5'-phosphate
Bracken, Christopher Andrew
1975-01-01T23:59:59.000Z
after 24 hr of normal rowih. ; = o', : EtUH, ' = 1% EtOH n, a. = not attempted I. e. = lost esperiment. 38 TABLE 7 Effect of cAMP-Bu on Glucose Production from Incubated Liver Slices* min EtOH Theo DBcAMP cAMP-Bu 15 107 122 100 73 30 104 118 93... Incubated in Modified Bicarbonate Buffer 5% EtOH solvent control ?- Theophylline 0. 2 mg/ml cAMP DBcAMP cAMP-Bu 5 x 10 M 5 x 10 M 5x10 M FiGURE 9 140 0 c ul 0 O +- 0 OP IfJ g 0 o 0 Ql E 120 100 80 time (hours) 41 FIGURE 10 Glucose...
Mauer, William A
1957-01-01T23:59:59.000Z
rash% in the Lower 4?oil? earn?4 N~F%~ whil? thea? r?ak?C in the lower qn?rtilo earn?4 $$, 984 Of the oi, vil ?ngin?o& yablie+?apl?~, thee? aek?d in the lower 4?oil??arn?4 $&, 640 whil? theo? r?nk?4 in tho lower quartile e?ra?4 Sgs~~ Xt weQ4?e?n Ad... Cees6ttee& y e sio i n lac Gal Su e 1 Qnl 0 yy+ ~ oonl4 be ?soared? A Qnoationnairo was oonposod) llsiJIg porta of 'ths one at@, 5. sed in the muley the National gooier of Professional Engineers? oonsisting bf Qlxootioaa pertain 1ng to eapl...
1978-01-01T23:59:59.000Z
11h80 has been a vory activo member of STl:.G since the present cornmittu8 took OVGr in Ootobur 1975. }{(, han boun our offioial 'translator! ancl has trans lated meny Gvrmru1 articles for momburs. Theo has beon Vii th STi,G since the first year....mericianization? - 1'he treatment of Women - The Captain - etc. 4/ The Ideals of star 'l'rok: - The obvious ideals - whore the conception breaks down - D'lC:u it ';ibrk? - HO',"T - IL;,s it bc;comc ;l, rnl:Lgion? - ; he: f;_1t18 'of" St,,\\I' TreE, 5/ 't'h" Vulcan...
Preparation, magnetic and optical properties of layered oxychalcogenides SmCuOCh (Ch = S or Se)
Llanos, Jaime [Departamento de Quimica, Universidad Catolica del Norte, Avda. Angamos 0610, Casilla 1280, Antofagasta (Chile)]. E-mail: jllanos@ucn.cl; Cortes, Rodrigo [Departamento de Quimica, Universidad Catolica del Norte, Avda. Angamos 0610, Casilla 1280, Antofagasta (Chile); Guizouarn, T. [Laboratoire de Chimie du Solide et Inorganique Moleculaire, UMR 6511-CNRS, Universite de Rennes 1-Institut de Chimie de Rennes, 35042 Rennes Cedex (France); Pena, Octavio [Laboratoire de Chimie du Solide et Inorganique Moleculaire, UMR 6511-CNRS, Universite de Rennes 1-Institut de Chimie de Rennes, 35042 Rennes Cedex (France)
2006-07-13T23:59:59.000Z
This paper reports on the synthesis and the electrical, magnetic and optical properties of SmCuOS and SmCuOSe. The magnetic properties reveal that Sm is in its 3+ oxidation state ({mu} {sup theo} = g{radical}J(J + 1) = 0.85 {mu}{sub B}; g = 2/7) with a large Van Vleck contribution, and exclude the possibility of a divalent oxidation state for samarium (Sm{sup 2+}; {sup 7}F{sub 0} state, g = J = 0, {mu} {sub eff} = 0). Optical properties were studied by means of diffuse reflectance and photoluminescence spectra in the UV-vis range. The electrical measurements show that the two samarium copper oxychalcogenides, SmCuOSe and SmCuOS are semiconductors with optical band gap (E {sub g}) values of 2.60 and 2.90 eV, respectively.
The Super-Kamiokande Collaboration
1999-03-18T23:59:59.000Z
A total of 614 upward through-going muons of minimum energy 1.6 GeV are observed by Super-Kamiokande during 537 detector live days. The measured muon flux is 1.74+/-0.07(stat.)+/-0.02(sys.)x10^{-13}cm^{-2}s^{-1}sr^{-1} compared to an expected flux of 1.97+/-0.44(theo.)x10^{-13}cm^{-2}s^{-1}sr^{-1}. The absolute measured flux is in agreement with the prediction within the errors. However, the zenith angle dependence of the observed upward through-going muon flux does not agree with no-oscillation predictions. The observed distortion in shape is consistent with the \
A. Tamii; P. von Neumann-Cosel; I. Poltoratska
2013-10-02T23:59:59.000Z
The electric dipole (E1) response of 208Pb has been precisely determined by measuring Coulomb excitation induced by proton scattering at very forward angles. The electric dipole polarizability, defined as inverse energy-weighted sum rule of the E1 strength, has been extracted as 20.1+-0.6 fm^3. The data can be used to constrain the neutron skin thickness of 208Pb to 0.168(+-0.009)_expt(+-0.013)_theo(+-0.021)_est fm, where the subscript "expt" refers to the experimental uncertainty, "theor" to the theoretical confidence band and "est" to the uncertainty associated with the estimation of the symmetry energy at the saturation density. In addition, a constraint band has been extracted in the plane of the symmetry energy (J) and its slope parameter (L) at the saturation density.
Improved protocols of secure quantum communication using W states
Chitra Shukla; Anindita Banerjee; Anirban Pathak
2012-04-20T23:59:59.000Z
Recently, Hwang et al. [Eur. Phys. J. D. 61, 785 (2011)] and Yuan et al. [Int. J. Theo. Phys. 50, 2403 (2011)] have proposed two efficient protocols of secure quantum communication using 3-qubit and 4-qubit symmetric W state respectively. These two dense coding based protocols are generalized and their efficiencies are considerably improved. Simple bounds on the qubit efficiency of deterministic secure quantum communication (DSQC) and quantum secure direct communication (QSDC) protocols are obtained and it is shown that dense coding is not essential for designing of maximally efficient DSQC and QSDC protocols. This fact is used to design maximally efficient protocols of DSQC and QSDC using 3-qubit and 4-qubit W states.
Lees, J.P.
2012-07-13T23:59:59.000Z
We report measurements of partial branching fractions for inclusive charmless semileptonic B decays {bar B} {yields} X{sub u}{ell}{bar {nu}}, and the determination of the CKM matrix element |V{sub ub}|. The analysis is based on a sample of 467 million {Upsilon}(4S) {yields} B{bar B} decays recorded with the BABAR detector at the PEP-II e{sup +}e{sup -} storage rings. We select events in which the decay of one of the B mesons is fully reconstructed and an electron or a muon signals the semileptonic decay of the other B meson. We measure partial branching fractions {Delta}{Beta} in several restricted regions of phase space and determine the CKM element |V{sub ub}| based on four different QCD predictions. For decays with a charged lepton momentum p*{sub {ell}} > 1.0 GeV in the B meson rest frame, we obtain {Delta}{Beta} = (1.80 {+-} 0.13{sub stat.} {+-} 0.15{sub sys.} {+-} 0.02{sub theo.}) x 10{sup -3} from a maximum likelihood fit to the two-dimensional M{sub X} - q{sup 2} distribution. Here, M{sub X} refers to the invariant mass of the final state hadron X and q{sup 2} is the invariant mass squared of the charged lepton and neutrino. From this measurement we extract |V{sub ub}| = (4.31 {+-} 0.25{sub exp.} {+-} 0.16{sub theo.}) x 10{sup -3} as the arithmetic average of four results obtained from four different QCD predictions of the partial rate. We separately determine partial branching fractions for {bar B}{sup 0} and B{sup -} decays and derive a limit on the isospin breaking in {bar B} {yields} X{sub u}{ell}{bar {nu}} decays.
Predictions of chiral perturbation theory for Compton scattering off protons
V. Lensky; V. Pascalutsa
2009-05-24T23:59:59.000Z
We compute the Compton scattering off the nucleons in the framework of manifestly covariant baryon chiral perturbation theory (B$\\chi$PT). The results for observables differ substantially from the corresponding calculations in heavy-baryon chiral perturbation theory (HB$\\chi$PT), most appreciably in the forward kinematics. We verify that the covariant $p^3$ result fulfills the forward-Compton-scattering sum rules. We also explore the effect of the $\\Delta$(1232) resonance. We find that the substantial effect of the $\\Delta$-excitation on the nucleon polarizabilities can naturally be accommodated in the manifestly covariant calculation.
Nonlinear Transformations and Filtering Theory for Space Operations
Weisman, Ryan Michael 1984-
2012-11-19T23:59:59.000Z
: Covariance Ele- ment Comparison of the EKF and TOV Bayes? Filter with Di erent Priors vs. the Numerical Covariance ( = 0:001rad) . . . . . . . . . 86 4.4 Arcing Mass Position and Velocity Measurement: Error for EKF and TOV Bayes? Filter with Di erent... Priors ( = 0:001rad) . . . . . . . 87 4.5 Arcing Mass Position and Velocity Measurement: Covariance Bounds for EKF and TOV Bayes? Filter with Di erent Priors ( = 0:001rad) 88 4.6 Arcing Mass Position and Velocity Measurement: Error and 3 Bounds...
Fred Cooper; Gouranga C. Nayak
2006-02-21T23:59:59.000Z
We study the non-perturbative production of gluon pairs from a constant SU(3) chromo-electric background field via the Schwinger mechanism. We fix the covariant background gauge with an arbitrary gauge parameter \\alpha. We determine the transverse momentum distribution of the gluons, as well as the total probability of creating pairs per unit space time volume. We find that the result is independent of the covariant gauge parameter \\alpha used to define arbitrary covariant background gauges. We find that our non-perturbative result is both gauge invariant and gauge parameter \\alpha independent.
Brown, Emery N.
Coherence analysis characterizes frequency-dependent covariance between signals, and is useful for multivariate oscillatory data often encountered in neuroscience. The global coherence provides a summary of coherent behavior ...
On Ergodic Secrecy Capacity for Gaussian MISO Wiretap Channels
Li, Jiangyuan
2010-01-01T23:59:59.000Z
A Gaussian multiple-input single-output (MISO) wiretap channel model is considered, where there exists a transmitter equipped with multiple antennas, a legitimate receiver and an eavesdropper each equipped with a single antenna. We study the problem of finding the optimal input covariance that achieves ergodic secrecy capacity subject to a power constraint where only statistical information about the eavesdropper channel is available at the transmitter. This is a non-convex optimization problem that is in general difficult to solve. Existing results address the case in which the eavesdropper or/and legitimate channels have independent and identically distributed Gaussian entries with zero-mean and unit-variance, i.e., the channels have trivial covariances. This paper addresses the general case where eavesdropper and legitimate channels have nontrivial covariances. A set of equations describing the optimal input covariance matrix are proposed along with an algorithm to obtain the solution. Based on this framew...
RICCI Sophie Global Change and Climate Modeling Team
RICCI Sophie Global Change and Climate Modeling Team CERFACS - Toulouse, FRANCE Technical Report TR covariance matrix#17;. This hypothesis stems from the T S water mass properties conservation over long term
Original article Restricted maximum likelihood
Paris-Sud XI, Université de
Original article Restricted maximum likelihood estimation of covariances in sparse linear models on the simplex algorithm of Nelder and Mead [40]. Kovac [29] made modifications that turned it into a stable
Method and system to estimate variables in an integrated gasification combined cycle (IGCC) plant
Kumar, Aditya; Shi, Ruijie; Dokucu, Mustafa
2013-09-17T23:59:59.000Z
System and method to estimate variables in an integrated gasification combined cycle (IGCC) plant are provided. The system includes a sensor suite to measure respective plant input and output variables. An extended Kalman filter (EKF) receives sensed plant input variables and includes a dynamic model to generate a plurality of plant state estimates and a covariance matrix for the state estimates. A preemptive-constraining processor is configured to preemptively constrain the state estimates and covariance matrix to be free of constraint violations. A measurement-correction processor may be configured to correct constrained state estimates and a constrained covariance matrix based on processing of sensed plant output variables. The measurement-correction processor is coupled to update the dynamic model with corrected state estimates and a corrected covariance matrix. The updated dynamic model may be configured to estimate values for at least one plant variable not originally sensed by the sensor suite.
Harms, Kyle E.
Variables 593 18 Generalized Additive Models 611 19 Mixed-Effects Models 627 20 Non-linear Regression 661 21 323 10 Regression 387 11 Analysis of Variance 449 12 Analysis of Covariance 489 13 Generalized Linear
Hawking Radiation as Tunneling: the D-dimensional rotating case
M. Nadalini; L. Vanzo; S. Zerbini
2005-11-24T23:59:59.000Z
The tunneling method for the Hawking radiation is revisited and applied to the $D$ dimensional rotating case. Emphasis is given to covariance of results. Certain ambiguities afflicting the procedure are resolved.
Measurement of advection and surface-atmosphere exchange in complex terrain.
Jones, Kevin H.
Accurate observations of the carbon cycle are essential as inputs to global climate models. Observations made by the micrometeorological technique of eddy covariance, whist widespread, may be incorrect if air is advected ...
Off-shell two loop QCD vertices
J. A. Gracey
2014-06-03T23:59:59.000Z
We calculate the triple gluon, ghost-gluon and quark-gluon vertex functions at two loops in the MSbar scheme in the chiral limit for an arbitrary linear covariant gauge when the external legs are all off-shell.
Ocean color observations and modeling for an optically complex site: Santa Barbara
Maritorena, Stéphane
goods and services including biogeo- chemical cycling, waste recycling, fisheries, and recreation. Our by colored dissolved organic matter and suspended sediments which only weakly covary with chlorophyll phytoplankton and colored dissolved organic matter contribute approximately equally to the total nonwater
Ecosystem fluxes of hydrogen: a comparison of flux-gradient methods
Meredith, Laura Kelsey
Our understanding of biosphere–atmosphere exchange has been considerably enhanced by eddy covariance measurements. However, there remain many trace gases, such as molecular hydrogen (H[subscript 2]), that lack suitable ...
Large Monitoring Systems: Data Analysis, Design and Deployment
Rajagopal, Ram
2009-01-01T23:59:59.000Z
4):269– A. Das and D. Kempe. Algorithms for subset selectionreturns property [Das and Kempe, 2008; Krause et al. , 2007]the covariance by Das and Kempe [2008]. Note that we assume
Partonic coalescence in relativistic heavy ion collisions
Greco, V.; Ko, Che Ming; Levai, P.
2003-01-01T23:59:59.000Z
Using a covariant coalescence model, we study hadron production in relativistic heavy ion collisions from both soft partons in the quark-gluon plasma and hard partons in minijets. Including transverse flow of soft partons and independent...
Political Analysis (2011) 19:385-408 doi:10.1093/pan/mpr032
Sekhon, Jasjeet S.
2011-01-01T23:59:59.000Z
winners and bare losers in U.S. House elections (19422008) differ markedly on pretreatment covariates Jacobson, Keith Poole, and Jonathan Wand for sharing their data with us. We thank the editors
Interpretable conditions for identifying direct and indirect effects
California at Los Angeles, University of
are more appealing to data analysts. Unfortunately, these interpretations are laden with two other sources assignment is essentially random after adjusting for observed pretreatment covariates and that the assignment pretreatment
Sample size for logistic regression with small response probability. Technical report No. 33
Whittemore, A S
1980-03-01T23:59:59.000Z
The Fisher information matrix for the estimated parameters in a multiple logistic regression can be approximated by the augmented Hessian matrix of the moment generating function for the covariates. The approximation is valid when the probability of response is small. With its use one can obtain a simple closed-form estimate of the asymptotic covariance matrix of the maximum-likelihood parameter estimates, and thus approximate sample sizes needed to test hypotheses about the parameters. The method is developed for selected distributions of a single covariate, and for a class of exponential-type distributions of several covariates. It is illustrated with an example concerning risk factors for coronary heart disease. 2 figures, 2 tables.
Test particle motion in modified gravity theories
Mahmood Roshan
2013-02-05T23:59:59.000Z
We derive the equations of motion of an electrically neutral test particle for modified gravity theories in which the covariant divergence of the ordinary matter energy-momentum tensor dose not vanish (i.e. $\
Sidiropoulos, Nikolaos D.
(excitation-emission matrices, EEM) data in which concentration values for two analytes covary exactly to a constant, but differently in each of two modes. In the PARAFAC solutions of the EEM data, all factors
analog resonances strangeness: Topics by E-print Network
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
to coalescence model predictions for dibaryon bound states. S. D. Paganis; G. W. Hoffmann; R. L. Ray; J. -L. Tang; T. Udagawa; R. S. Longacre 2000-06-12 7 Covariant...
Anisotropy in Gravity and Holography
Melby-Thompson, Charles Milton
2012-01-01T23:59:59.000Z
P. Ho?rava, and C. M. Melby-Thompson, Conformal LifshitzP. Ho?rava and C. M. Melby-Thompson, General Covariance inP. Ho?rava and C. M. Melby-Thompson, Anisotropic Conformal
On the Energy Momentum Tensor of the M-Theory Fivebrane
O. Baerwald; N. D. Lambert; P. C. West
1999-04-14T23:59:59.000Z
We construct the energy momentum tensor for the bosonic fields of the covariant formulation of the M-theory fivebrane within that formalism. We then obtain the energy for various solitonic solutions of the fivebrane equations of motion.
Relationships between climate, vegetation, and energy exchange across a montane gradient
Anderson, Ray G.; Goulden, Michael L.
2011-01-01T23:59:59.000Z
Energy Balance platform and four eddy covariance towers. Wetower data show that precipitation timing is the largest control on energytower, maximum seasonal EF usually coincided with peak EVI, indicating that transpiration is a major fraction of energy
Approaches to Speech Recognition based on Speaker Recognition Daniel Povey
Povey, Dan
the techniques used, without the full technical details. We initially used an approach based on Maximum a Posteri methods such as nuisance attribute projection (SCB05), within-class covariance nor- malization (HKS06
Application of robust statistics to asset allocation models
Zhou, Xinfeng
2006-01-01T23:59:59.000Z
Many strategies for asset allocation involve the computation of expected returns and the covariance or correlation matrix of financial instruments returns. How much of each instrument to own is determined by an attempt to ...
Exceptional field theory. II. E[subscript 7(7)
Hohm, Olaf
We introduce the exceptional field theory for the group E[subscript 7(7)], based on a (4+56)-dimensional spacetime subject to a covariant section condition. The “internal” generalized diffeomorphisms of the coordinates in ...
Quantum Signatures of Spacetime Graininess Quantum Signatures of Spacetime
Quantum Field Theory on Noncommutative Spacetime Implementing Poincaré Symmetry Hopf Algebras, Drinfel Quantum Mechanics on Noncommutative Spacetime 4 Quantum Field Theory on Noncommutative Spacetime Covariant Derivatives and Field Strength Noncommutative Gauge Theories 6 Signatures of Spin
Gauging the twisted Poincare symmetry as a noncommutative theory of gravitation
Chaichian, M.; Tureanu, A. [Department of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki (Finland); Helsinki Institute of Physics, P.O. Box 64, FIN-00014 Helsinki (Finland); Oksanen, M. [Department of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki (Finland); Zet, G. [Department of Physics, 'Gh. Asachi' Technical University, Bd. D. Mangeron 67, 700050 Iasi (Romania)
2009-02-15T23:59:59.000Z
Einstein's theory of general relativity was formulated as a gauge theory of Lorentz symmetry by Utiyama in 1956, while the Einstein-Cartan gravitational theory was formulated by Kibble in 1961 as the gauge theory of Poincare transformations. In this framework, we propose a formulation of the gravitational theory on canonical noncommutative space-time by covariantly gauging the twisted Poincare symmetry, in order to fulfil the requirement of covariance under the general coordinate transformations, an essential ingredient of the theory of general relativity. It appears that the twisted Poincare symmetry cannot be gauged by generalizing the Abelian twist to a covariant non-Abelian twist, nor by introducing a more general covariant twist element. The advantages of such a formulation as well as the related problems are discussed and possible ways out are outlined.
E-Mail karger@karger.com Brain Behav Evol 2013;82:1930
Hochner, Binyamin
ex- plains covariation of body form, nervous system organiza- tion, and level of behavioral. Safra Campus, Givat Ram, Hebrew University Jerusalem 9190 (Israel) E-Mail benny.hochner @ mail.huji.ac.il
The Quantitative Genetics of Mate Choice Evolution: Theory and Empiricism
Ratterman, Nicholas 1981-
2012-11-15T23:59:59.000Z
emerged. From a theoretical standpoint, the nature of the genetic covariance built up by the process of mate choice has received considerable attention, though the models still make biologically unrealistic assumptions. Empirically, the difficulty...
Application of Bayesian Hierarchical Models in Genetic Data Analysis
Zhang, Lin
2012-08-15T23:59:59.000Z
expression levels follow a Gaussian distribution. We derive the gene network structures by selecting covariance matrices of the Gaussian distribution with a hyper-inverse Wishart prior. We incorporate prior network models based on Gene Ontology information...
Feeding and energetics of the great scallop, Pecten maximus, through a DEB1 Romain Lavauda,
Paris-Sud XI, Université de
of the Dynamic Energy Budget (DEB) theory. The covariation method was implemented to estimate the parameters trophic sources, from microalgae cells to detritus. They are also able to sort and select food particles
Boundary-Layer Meteorol (2010) 137:307326 DOI 10.1007/s10546-010-9529-5
Minnesota, University of
). A considerable amount of isotope research has focused on the condensed phase. However, the analysis of water-covariance and infrared gas analyser techniques over a soybean canopy in 2008. The results indicate that w and F agreed
Boundary-Layer Meteorol DOI 10.1007/s10546-010-9529-5
Minnesota, University of
). A considerable amount of isotope research has focused on the condensed phase. However, the analysis of water compared using EC-TDL and traditional eddy-covariance and infrared gas analyser techniques over a soybean
Developing Voices for Smart Homes: User Personality and Synthetic Voice Interaction
Boye, Greta
2007-11-28T23:59:59.000Z
Participants (n = 40) aged 27 through 76 years (M = 57.7, Mdn = 59.0) took part in a 2 (voice emotion) x 2 (message content) within subjects factorial design experiment with the between-subject covariates agreeableness and ...
Generalized Gravity I : Kinematical Setting and reformalizing Quantum Field Theory
Johan Noldus
2008-04-20T23:59:59.000Z
The first part of this work deals with the development of a natural differential calculus on non-commutative manifolds. The second part extends the covariance and equivalence principle as well studies its kinematical consequences such as the arising of gauge theory. Furthermore, a manifestly causal and covariant formulation of quantum field theory is presented which surpasses the usual Hamiltonian and path integral construction. A particular representation of this theory on the kinematical structure developed in section three is moreover given.
Space-Time Models based on Random Fields with Local Interactions
Dionissios T. Hristopulos; Ivi C. Tsantili
2015-03-06T23:59:59.000Z
The analysis of space-time data from complex, real-life phenomena requires the use of flexible and physically motivated covariance functions. In most cases, it is not possible to explicitly solve the equations of motion for the fields or the respective covariance functions. In the statistical literature, covariance functions are often based on mathematical constructions. We propose deriving space-time covariance functions by solving "effective equations of motion", which can be used as statistical representations of systems with diffusive behavior. In particular, we propose using the linear response theory to formulate space-time covariance functions based on an equilibrium effective Hamiltonian. The effective space-time dynamics are then generated by a stochastic perturbation around the equilibrium point of the classical field Hamiltonian leading to an associated Langevin equation. We employ a Hamiltonian which extends the classical Gaussian field theory by including a curvature term and leads to a diffusive Langevin equation. Finally, we derive new forms of space-time covariance functions.
Choice of Gauge in Quantum Gravity
Petr Hajicek
1999-03-24T23:59:59.000Z
This paper is an extended version of the talk given at 19th Texas Symposium of Relativistic Astrophysics and Cosmology, Paris, 1998. It reviews of some recent work; mathematical details are skipped. It is well-known that a choice of gauge in generally covariant models has a twofold pupose: not only to render the dynamics unique, but also to define the spacetime points. A geometric way of choosing gauge that is not based on coordinate conditions---the so-called covariant gauge fixing---is described. After a covariant gauge fixing, the dynamics is unique and the background manifold points are well-defined, but the description remains invariant with respect to all diffeomorphisms of the background manifold. Transformations between different covariant gauge fixings form the well-known Bergmann-Komar group. Each covariant gauge fixing determines a so-called Kucha\\v{r} decomposition. The construction of the quantum theory is based on the Kucha\\v{r} form of the action and the Dirac method of operator constraints. It is demonstrated that the Bergmann-Komar group is too large to be implementable by unitary maps in the quantum domain.
ZEUS collaboration; H. Abramowicz; I. Abt; L. Adamczyk; M. Adamus; R. Aggarwal; S. Antonelli; O. Arslan; V. Aushev; Y. Aushev; O. Bachynska; A. N. Barakbaev; N. Bartosik; O. Behnke; J. Behr; U. Behrens; A. Bertolin; S. Bhadra; I. Bloch; V. Bokhonov; E. G. Boos; K. Borras; I. Brock; R. Brugnera; A. Bruni; B. Brzozowska; P. J. Bussey; A. Caldwell; M. Capua; C. D. Catterall; J. Chwastowski; J. Ciborowski; R. Ciesielski; A. M. Cooper-Sarkar; M. Corradi; F. Corriveau; G. D'Agostini; R. K. Dementiev; R. C. E. Devenish; G. Dolinska; V. Drugakov; S. Dusini; J. Ferrando; J. Figiel; B. Foster; G. Gach; A. Garfagnini; A. Geiser; A. Gizhko; L. K. Gladilin; O. Gogota; Yu. A. Golubkov; J. Grebenyuk; I. Gregor; G. Grzelak; O. Gueta; M. Guzik; W. Hain; G. Hartner; D. Hochman; R. Hori; Z. A. Ibrahim; Y. Iga; M. Ishitsuka; A. Iudin; F. Januschek; I. Kadenko; S. Kananov; T. Kanno; U. Karshon; M. Kaur; P. Kaur; L. A. Khein; D. Kisielewska; R. Klanner; U. Klein; N. Kondrashova; O. Kononenko; Ie. Korol; I. A. Korzhavina; A. Kota?ski; U. Kötz; N. Kovalchuk; H. Kowalski; O. Kuprash; M. Kuze; B. B. Levchenko; A. Levy; V. Libov; S. Limentani; M. Lisovyi; E. Lobodzinska; W. Lohmann; B. Löhr; E. Lohrmann; A. Longhin; D. Lontkovskyi; O. Yu. Lukina; J. Maeda; I. Makarenko; J. Malka; J. F. Martin; S. Mergelmeyer; F. Mohamad Idris; K. Mujkic; V. Myronenko; K. Nagano; A. Nigro; T. Nobe; D. Notz; R. J. Nowak; K. Olkiewicz; Yu. Onishchuk; E. Paul; W. Perla?ski; H. Perrey; N. S. Pokrovskiy; A. S. Proskuryakov; M. Przybycie?; A. Raval; P. Roloff; I. Rubinsky; M. Ruspa; V. Samojlov; D. H. Saxon; M. Schioppa; W. B. Schmidke; U. Schneekloth; T. Schörner-Sadenius; J. Schwartz; L. M. Shcheglova; R. Shehzadi; R. Shevchenko; O. Shkola; I. Singh; I. O. Skillicorn; W. S?omi?ski; V. Sola; A. Solano; A. Spiridonov; L. Stanco; N. Stefaniuk; A. Stern; T. P. Stewart; P. Stopa; J. Sztuk-Dambietz; D. Szuba; J. Szuba; E. Tassi; T. Temiraliev; K. Tokushuku; J. Tomaszewska; A. Trofymov; V. Trusov; T. Tsurugai; M. Turcato; O. Turkot; T. Tymieniecka; A. Verbytskyi; O. Viazlo; R. Walczak; W. A. T. Wan Abdullah; K. Wichmann; M. Wing; G. Wolf; S. Yamada; Y. Yamazaki; N. Zakharchuk; A. F. ?arnecki; L. Zawiejski; O. Zenaiev; B. O. Zhautykov; N. Zhmak; D. S. Zotkin
2014-10-21T23:59:59.000Z
The production of beauty and charm quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared 5 < Q^2 < 1000 GeV^2 using an integrated luminosity of 354 pb^{-1}. The beauty and charm content in events with at least one jet have been extracted using the invariant mass of charged tracks associated with secondary vertices and the decay-length significance of these vertices. Differential cross sections as a function of Q^2, Bjorken x, jet transverse energy and pseudorapidity were measured and compared with next-to-leading-order QCD calculations. The beauty and charm contributions to the proton structure functions were extracted from the double-differential cross section as a function of x and Q^2. The running beauty-quark mass, m_b at the scale m_b, was determined from a QCD fit at next-to-leading order to HERA data for the first time and found to be 4.07 \\pm 0.14 (fit} ^{+0.01}_{-0.07} (mod.) ^{+0.05}_{-0.00} (param.) ^{+0.08}_{-0.05} (theo) GeV.
CMS Collaboration
2014-10-24T23:59:59.000Z
The inclusive jet cross section for proton-proton collisions at a centre-of-mass energy of 7 TeV was measured by the CMS Collaboration at the LHC with data corresponding to an integrated luminosity of 5.0 inverse femtobarns. The measurement covers a phase space up to 2 TeV in jet transverse momentum and 2.5 in absolute jet rapidity. The statistical precision of these data leads to stringent constraints on the parton distribution functions of the proton. The data provide important input for the gluon density at high fractions of the proton momentum and for the strong coupling constant at large energy scales. Using predictions from perturbative quantum chromodynamics at next-to-leading order, complemented with electroweak corrections, the constraining power of these data is investigated and the strong coupling constant at the Z boson mass M[Z] is determined to be alpha[S(M[Z])} = 0.1185 +/- 0.0019 (exp) +0.0060 -0.0037 (theo), which is in agreement with the world average.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Khachatryan, Vardan
2015-05-01T23:59:59.000Z
Properties of the Higgs boson with mass near 125 GeV are measured in proton-proton collisions with the CMS experiment at the LHC. Comprehensive sets of production and decay measurements are combined. The decay channels include ??, ZZ, WW, ??, bb, and ?? pairs. The data samples were collected in 2011 and 2012 and correspond to integrated luminosities of up to 5.1 fb?¹ at 7 TeV and up to 19.7 fb?¹ at 8 TeV. From the high-resolution ?? and ZZ channels, the mass of the Higgs boson is determined to be 125.02\\,+0.26-0.27(stat)+0.14-0.15(syst) GeV. For this mass value, the event yields obtainedmore »in the different analyses tagging specific decay channels and production mechanisms are consistent with those expected for the standard model Higgs boson. The combined best-fit signal relative to the standard model expectation is 1.00 ± 0.09 (stat), +0.08 -0.07 (theo) ± 0.07 (syst) at the measured mass. The couplings of the Higgs boson are probed for deviations in magnitude from the standard model predictions in multiple ways, including searches for invisible and undetected decays. No significant deviations are found.« less
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Khachatryan, Vardan; et al.,
2015-05-01T23:59:59.000Z
This paper presents a measurement of the inclusive 3-jet production differential cross section at a proton-proton centre-of-mass energy of 7 TeV using data corresponding to an integrated luminosity of 5 fb$^{-1}$ collected with the CMS detector. The analysis is based on the three jets with the highest transverse momenta. The cross section is measured as a function of the invariant mass of the three jets in a range of 445-3270 GeV and in two bins of the maximum rapidity of the jets up to a value of 2. A comparison between the measurement and the prediction from perturbative QCD atmore »next-to-leading order is performed. Within uncertainties, data and theory are in agreement. The sensitivity of the observable to parameters of the theory such as the parton distribution functions of the proton and the strong coupling constant $\\alpha_S$ is studied. A fit to all data points with 3-jet masses larger than 664 GeV gives a value of the strong coupling constant of $\\alpha_S(M_\\mathrm{Z})$ = 0.1171 $\\pm$ 0.0013 (exp) $^{+0.0073}_{-0.0047}$ (theo).« less
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Khachatryan, Vardan [Yerevan Physics Institute (Armenia); et al.,
2015-05-01T23:59:59.000Z
This paper presents a measurement of the inclusive 3-jet production differential cross section at a proton-proton centre-of-mass energy of 7 TeV using data corresponding to an integrated luminosity of 5 fb$^{-1}$ collected with the CMS detector. The analysis is based on the three jets with the highest transverse momenta. The cross section is measured as a function of the invariant mass of the three jets in a range of 445-3270 GeV and in two bins of the maximum rapidity of the jets up to a value of 2. A comparison between the measurement and the prediction from perturbative QCD at next-to-leading order is performed. Within uncertainties, data and theory are in agreement. The sensitivity of the observable to parameters of the theory such as the parton distribution functions of the proton and the strong coupling constant $\\alpha_S$ is studied. A fit to all data points with 3-jet masses larger than 664 GeV gives a value of the strong coupling constant of $\\alpha_S(M_\\mathrm{Z})$ = 0.1171 $\\pm$ 0.0013 (exp) $^{+0.0073}_{-0.0047}$ (theo).
Multi Jet Production at High Q2
Thomas Kluge
2005-10-31T23:59:59.000Z
Deep-inelastic $e^+p$ scattering data, taken with the H1 detector at HERA, are used to investigate jet production over a range of four-momentum transfers $150 < Q^2 < 15000 \\mathrm{GeV}^2$ and transverse jet energies $5 < E_T < 50 \\mathrm{GeV}$. The analysis is based on data corresponding to an integrated luminosity of $\\mathcal{L}_\\mathrm{int} = 65.4 \\mathrm{pb}^{-1}$ taken in the years 1999-2000 at a centre-of-mass energy $\\sqrt{s} \\approx 319 \\mathrm{GeV}$. Jets are defined by the inclusive $k_t$ algorithm in the Breit frame of reference. Dijet and trijet jet cross sections are measured with respect to the exchanged boson virtuality and in addition the ratio of the trijet to the dijet cross section $R_{3/2}$ is investigated. The results are compared to the predictions of perturbative QCD calculations in next-to-leading order in the strong coupling constant $\\alpha_s$. The value of $\\alpha_s(m_Z)$ determined from the study of $R_{3/2}$ is $\\alpha_s(m_Z) = 0.1175 \\pm 0.0017 (\\mathrm{stat.}) \\pm 0.0050 (\\mathrm{syst.}) ^{+0.0054}_{-0.0068} (\\mathrm{theo.})$.
Airapetian, A; Akopov, Z; Andrus, A; Aschenauer, E C; Augustyniak, W; Avakian, R; Avetisian, A; Avetissian, E; Belostotskii, S; Bianchi, N; Blok, H P; Böttcher, H; Borisov, A; Borysenko, A; Brüll, A; Bryzgalov, V; Capiluppi, M; Capitani, G P; Ciullo, G; Contalbrigo, M; Dalpiaz, P F; Deconinck, W; De Leo, R; Demey, M; De Nardo, L; De Sanctis, E; Devitsin, E; Diefenthaler, M; Di Nezza, P; Dreschler, J; Düren, M; Ehrenfried, M; Elalaoui-Moulay, A; Elbakian, G; Ellinghaus, F; Elschenbroich, U; Fabbri, R; Fantoni, A; Felawka, L; Frullani, S; Funel, A; Gabbert, D; Gärber, Y; Gapienko, G; Gapienko, V; Garibaldi, F; Garrow, K; Gavrilov, G; Karibian, V; Giordano, F; Grebenyuk, O; Gregor, I M; Guler, H; Gute, A; Hadjidakis, C; Hartig, M; Hasch, D; Hasegawa, T; Hesselink, W H A; Hillenbrand, A; Hoek, M; Holler, Y; Hommez, B; Hristova, I; Iarygin, G; Ivanilov, A; Izotov, A; Jackson, H E; Jgoun, A; Kaiser, R; Keri, T; Kinney, E; Kiselev, A; Kobayashi, T; Kopytin, M; Korotkov, V; Kozlov, V; Krauss, B; Kravchenko, P; Krivokhizhin, V G; Lagamba, L; Lapikas, L; Lenisa, P; Liebing, P; Linden-Levy, L A; Lorenzon, W; Lü, J; Lu, S; Ma, B Q; Maiheu, B; Makins, N C R; Mao, Y; Marianski, B; Marukyan, H; Masoli, F; Mexner, V; Meyners, N; Michler, T; Miklukho, O; Miller, C A; Miyachi, Y; Muccifora, V; Murray, M; Nagaitsev, A; Nappi, E; Naryshkin, Yu; Negodaev, M; Nowak, Wolf-Dieter; Ohsuga, H; Osborne, A; Perez-Benito, R; Pickert, N; Raithel, M; Reggiani, D; Reimer, P E; Reischl, A; Reolon, A R; Riedl, C; Rith, K; Rosner, G; Rostomyan, A; Rubacek, L; Rubin, J; Ryckbosch, D; Salomatin, Y; Sanjiev, I; Savin, I; Schäfer, A; Schnell, G; Schüler, K P; Seele, J; Seitz, B; Shearer, C; Shibata, T A; Shutov, V; Sinram, K; Stancari, M; Statera, M; Steffens, E; Steijger, J J M; Stenzel, H; Stewart, J; Stinzing, F; Stösslein, U; Streit, J; Tait, P; Tanaka, H; Taroian, S P; Tchuiko, B; Terkulov, A R; Trzcinski, A; Tytgat, M; Vandenbroucke, A; Van der Nat, P B; van der Steenhoven, G; Van Haarlem, Y; Veretennikov, D; Vikhrov, V; Vogel, C; Wang, S; Weiskopf, C; Ye, Y; Ye, Z; Yen, S; Zihlmann, B; Zupranski, P
2006-01-01T23:59:59.000Z
Precise measurements of the spin structure functions of the proton $g_1^p(x,Q^2)$ and deuteron $g_1^d(x,Q^2)$ are presented over the kinematic range $0.0041 \\leq x \\leq 0.9$ and $0.18 $ GeV$^2$ $\\leq Q^2 \\leq 20$ GeV$^2$. The data were collected at the HERMES experiment at DESY, in deep-inelastic scattering of 27.6 GeV longitudinally polarized positrons off longitudinally polarized hydrogen and deuterium gas targets internal to the HERA storage ring. The neutron spin structure function $g_1^n$ is extracted by combining proton and deuteron data. The integrals of $g_1^{p,d}$ at $Q^2=5$ GeV$^2$ are evaluated over the measured $x$ range. Neglecting any possible contribution to the $g_1^d$ integral from the region $x \\leq 0.021$, a value of $0.330 \\pm 0.011\\mathrm{(theo.)}\\pm0.025\\mathrm{(exp.)}\\pm 0.028$(evol.) is obtained for the flavor-singlet axial charge $a_0$ in a leading-twist NNLO analysis.
DALIS: a computer-assisted document retrieval system for the FFTF
Harves, W G
1981-05-12T23:59:59.000Z
The FFTF (Fast Flux Test Facility) is a liquid sodium cooled, fast flux reactor designed specifically for irradiation testing of fuels and components for liquid metal fast breeder reactors. The Department of Energy and the Nuclear Regulatory Commission require that all pertinent documentation for maintenance, operation, and safety of the FFTF be readily accessible and retrievable, both during initial startup and for the lifetime of the plant. That amounts to a lot of information which has to be retrievable. The indexing system finally developed is called the DALIS system, short for Document and Location Indexing System. This system was designed by an engineer (Michael Theo) for use by engineers. DALIS uses descriptiors and keywords to identify each document in the system. The descriptors give such information as document number, date of issuance of the document, the title, the originating organization, and the microfilm or hardcopy location of the document. The keywords are words or phrases that describe the content of the document and permit retrieval by means of a computer search for documents with the stated keywords.
Spectral diagonal ensemble Kalman filters
Kasanický, Ivan; Vejmelka, Martin
2015-01-01T23:59:59.000Z
A new type of ensemble Kalman filter is developed, which is based on replacing the sample covariance in the analysis step by its diagonal in a spectral basis. It is proved that this technique improves the aproximation of the covariance when the covariance itself is diagonal in the spectral basis, as is the case, e.g., for a second-order stationary random field and the Fourier basis. The method is extended by wavelets to the case when the state variables are random fields, which are not spatially homogeneous. Efficient implementations by the fast Fourier transform (FFT) and discrete wavelet transform (DWT) are presented for several types of observations, including high-dimensional data given on a part of the domain, such as radar and satellite images. Computational experiments confirm that the method performs well on the Lorenz 96 problem and the shallow water equations with very small ensembles and over multiple analysis cycles.
Erratum: A Comparison of Closures for Stochastic Advection-Diffusion Equations
Jarman, Kenneth D.; Tartakovsky, Alexandre M.
2015-01-01T23:59:59.000Z
This note corrects an error in the authors' article [SIAM/ASA J. Uncertain. Quantif., 1 (2013), pp. 319 347] in which the cited work [Neuman, Water Resour. Res., 29(3) (1993), pp. 633 645] was incorrectly represented and attributed. Concentration covariance equations presented in our article as new were in fact previously derived in the latter work. In the original abstract, the phrase " . . .we propose a closed-form approximation to two-point covariance as a measure of uncertainty. . ." should be replaced by the phrase " . . .we study a closed-form approximation to two-point covariance, previously derived in [Neuman 1993], as a measure of uncertainty." The primary results in our article--the analytical and numerical comparison of existing closure methods for specific example problems are not changed by this correction.
Robert T. Thompson; Mohsen Fathi
2015-06-29T23:59:59.000Z
The fully covariant formulation of transformation optics is used to find the configuration of a cloaking device operating in an expanding universe modelled by a Friedmann-Lema\\^itre-Robertson-Walker spacetime. This spacetime cloak is used as a platform for probing the covariant formulation of transformation optics, thereby rigorously enhancing the conceptual understanding of the theory. By studying the problem in both comoving and physical coordinates we explicitly demonstrate the preservation of general covariance of electrodynamics under the transformation optics procedure. This platform also enables a detailed study of the various transformations that arise in transformation optics. We define a corporeal transformation as the "transformation" of transformation optics, and distinguish it from coordinate and frame transformations. We find that corporeal transformations considered in the literature have generally been restricted to a subset of all possible corporeal transformations, providing a potential mechanism for increased functionality of transformation optics.
Generalized helicity and Beltrami fields
Buniy, Roman V., E-mail: roman.buniy@gmail.com [Schmid College of Science, Chapman University, Orange, CA 92866 (United States); Isaac Newton Institute, University of Cambridge, Cambridge, CB3 0EH (United Kingdom); Kephart, Thomas W., E-mail: tom.kephart@gmail.com [Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 (United States); Isaac Newton Institute, University of Cambridge, Cambridge, CB3 0EH (United Kingdom)
2014-05-15T23:59:59.000Z
We propose covariant and non-abelian generalizations of the magnetic helicity and Beltrami equation. The gauge invariance, variational principle, conserved current, energy–momentum tensor and choice of boundary conditions elucidate the subject. In particular, we prove that any extremal of the Yang–Mills action functional 1/4 ?{sub ?}trF{sub ??}F{sup ??}d{sup 4}x subject to the local constraint ?{sup ????}trF{sub ??}F{sub ??}=0 satisfies the covariant non-abelian Beltrami equation. -- Highlights: •We introduce the covariant non-abelian helicity and Beltrami equation. •The Yang–Mills action and instanton term constraint lead to the Beltrami equation. •Solutions of the Beltrami equation conserve helicity.
Noncommutative (supersymmetric) electrodynamics in the Yang-Feldman formalism
Zahn, Jochen [Courant Research Centre 'Higher Order Structures in Mathematics', University of Goettingen, D-37073 Goettingen (Germany)
2010-11-15T23:59:59.000Z
We study quantum electrodynamics on the noncommutative Minkowski space (NCQED) in the Yang-Feldman formalism. Local observables are defined by using covariant coordinates. We compute the two-point function of the interacting field strength to second order and find the infrared divergent terms already known from computations using the so-called modified Feynman rules. It is shown that these lead to nonlocal renormalization ambiguities. Also new nonlocal divergences stemming from the covariant coordinates are found. Furthermore, we study the supersymmetric extension of the model. For this, the supersymmetric generalization of the covariant coordinates is introduced. We find that the nonlocal divergences cancel. At the one-loop level, the only effect of noncommutativity is then a momentum-dependent field strength normalization. We interpret it as an acausal effect and show that its range is independent of the noncommutativity scale.
Radon-Nikodym type theorem for {alpha}-completely positive maps
Heo, Jaeseong [Department of Mathematics, Research Institute for Natural Sciences, Hanyang University, Seoul 133-791 (Korea, Republic of); Ji, Un Cig [Department of Mathematics, Research Institute of Mathematical Finance, Chungbuk National University, Cheongju 361-763 (Korea, Republic of)
2010-10-15T23:59:59.000Z
We introduce a new notion of {alpha}-completely positive map on a C*-algebra as a generalization of the notion of completely positive map. Then we study a theorem of the Radon-Nikodym type that there is a one-to-one correspondence between {alpha}-completely positive maps and positive operators and, as an application of the Radon-Nikodym type theorem, we give a characterization of pure {alpha}-completely positive maps. Finally, we study a covariant version of the Stinespring's theorem for a covariant {alpha}-completely positive map (see Theorem 4.3).
Particle Energy Spectrum, Revisited from a Counting Statistics Perspective
None
2012-07-28T23:59:59.000Z
In nuclear science, gamma and neutron spectra are counted energy by energy, and then particle by particle. Until recently, few studies have been performed on how exactly those energy spectra are counted, or how those counts are correlated. Because of lack of investigation, cross section covariance and correlation matrices are usually estimated using perturbation method. We will discuss a statistical counting scheme that shall mimic the gamma and neutron counting process used in nuclear science. From this counting scheme, the cross section covariance and correlation can be statistically derived.
Undeformed (additive) energy conservation law in Doubly Special Relativity
Gianluca Mandanici
2008-11-11T23:59:59.000Z
All the Doubly Special Relativity (DSR) models studied in literature so far involve a deformation of the energy conservation rule that forces us to release the hypothesis of the additivity of the energy for composite systems. In view of the importance of the issue for a consistent formulation of a DSR statistical mechanics and a DSR thermodynamics, we show that DSR models preserving the usual (i.e. additive) energy conservation rule can be found. These models allow the construction of a DSR-covariant extensive energy. The implications of the analysis for the dynamics of DSR-covariant multiparticle systems are also briefly discussed.
Apparent horizon in fluid-gravity duality
Booth, Ivan; Heller, Michal P.; Plewa, Grzegorz; Spalinski, Michal [Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, A1C 5S7 (Canada); Instituut voor Theoretische Fysica, Universiteit van Amsterdam, Science Park 904, 1090 GL Amsterdam (Netherlands); Soltan Institute for Nuclear Studies, Hoza 69, 00-681 Warsaw (Poland); Soltan Institute for Nuclear Studies, Hoza 69, 00-681 Warsaw (Poland) and Physics Department, University of Bialystok, 15-424 Bialystok (Poland)
2011-05-15T23:59:59.000Z
This article develops a computational framework for determining the location of boundary-covariant apparent horizons in the geometry of conformal fluid-gravity duality in arbitrary dimensions. In particular, it is shown up to second order and conjectured to hold to all orders in the gradient expansion that there is a unique apparent horizon which is covariantly expressible in terms of fluid velocity, temperature, and boundary metric. This leads to the first explicit example of an entropy current defined by an apparent horizon and opens the possibility that in the near-equilibrium regime there is preferred foliation of apparent horizons for black holes in asymptotically anti-de Sitter spacetimes.
The spinor field theory of the photon
Ruo Peng Wang
2011-09-18T23:59:59.000Z
I introduce a spinor field theory for the photon. The three-dimensional vector electromagnetic field and the four-dimensional vector potential are components of this spinor photon field. A spinor equation for the photon field is derived from Maxwell's equations,the relations between the electromagnetic field and the four-dimensional vector potential, and the Lorentz gauge condition. The covariant quantization of free photon field is done, and only transverse photons are obtained. The vacuum energy divergence does not occur in this theory. A covariant "positive frequency" condition is introduced for separating the photon field from its complex conjugate in the presence of the electric current and charge.
Tensor distributions on signature-changing space-times
David Hartley; Robin W. Tucker; Philip A. Tuckey; Tevian Dray
1997-01-21T23:59:59.000Z
Irregularities in the metric tensor of a signature-changing space-time suggest that field equations on such space-times might be regarded as distributional. We review the formalism of tensor distributions on differentiable manifolds, and examine to what extent rigorous meaning can be given to field equations in the presence of signature-change, in particular those involving covariant derivatives. We find that, for both continuous and discontinuous signature-change, covariant differentiation can be defined on a class of tensor distributions wide enough to be physically interesting.
Special FocuS Review RNa Biology 7:1, 90-97; January/February 2010; 2009 landes Bioscience
Barash, Danny
Special FocuS Review analyze the riboswitches. Although the discovery itself was bio- logical, with the first of bacte- rial riboswitches. Ruzzo and coworkers, through their covariance models (CM) approach pyrophosphate energy minimization methods for RNa secondary structure prediction have been used extensively
Bibliography [AB94] M. Alencar and I. Blake. The capacity for a discrete
Verdú, Sergio
, 1995. [AC97] S. Amari and J. Cardoso. Blind source separation semiparametric statistical approachSpectrum communication systems. PhD thesis, University of Massachusetts, Amherst, Mass, Sept. 1996. [AD62] E. Arthurs. Moulines. Sub space blind identification of multichannel FIR with un known spatial covariance. IEEE
Long, Di
2012-10-19T23:59:59.000Z
Iowa, U.S., on three Landsat TM/ETM imagery acquisition dates in 2002. Results show the EF and latent heat flux (LE) estimates with a mean absolute percentage difference (MAPD) of 6.7 percent and 8.7 percent, respectively, relative to eddy covariance...
Gille-SIO 221C 1 Objective Mapping: Anisotropic Statistics
Gille, Sarah T.
Gille-SIO 221C 1 Objective Mapping: Anisotropic Statistics Objective mapping discussions often assume that covariance statistics are isotropic and homogeneous. However, in the ocean and atmosphere. The equations used to carry out objective mapping are easily modified to allow for anisotropic statistics
Robust Secure Transmission in MISO Channels With Imperfect ECSI
Swindlehurst, A. Lee
Robust Secure Transmission in MISO Channels With Imperfect ECSI Jing Huang and A. Lee Swindlehurst.huang; swindle}@uci.edu Abstract--This paper studies robust transmission schemes for MISO wiretap channels-input single-output (MISO) wiretap cannels, the optimal transmit covariance matrix was found to be single
QoS-Constrained Robust Beamforming in MISO Wiretap Channels with a Helper
Swindlehurst, A. Lee
QoS-Constrained Robust Beamforming in MISO Wiretap Channels with a Helper Jing Huang and A. Lee for multiple-input single-output (MISO) wiretap chan- nels with a helper. The channel state information (CSI][8]. In particular, for multiple-input single-output (MISO) wiretap channels, the optimal transmit covariance matrix
Proof of the outage probability conjecture for MISO channels
Abbe, Emmanuel; Telatar, Emre
2011-01-01T23:59:59.000Z
In Telatar 1999, it is conjectured that the covariance matrices minimizing the outage probability for MIMO channels with Gaussian fading are diagonal with either zeros or constant values on the diagonal. In the MISO setting, this is equivalent to conjecture that the Gaussian quadratic forms having largest tale probability correspond to such diagonal matrices. We prove here the conjecture in the MISO setting.
Mark Chanachowicz; Claudia M. Chanu; Raymond G. McLenaghan
2007-11-13T23:59:59.000Z
An invariant characterization of the rotationally symmetric R-separable webs for the Laplace equation in Euclidean space is given in terms of invariants and covariants of a real binary quartic canonically associated to the characteristic conformal Killing tensor which defines the webs.
Evaluated Nuclear (reaction) Data from the Evaluated Nuclear Data File (ENDF)
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
The current version is ENDF/B VII.0, released in 2006. Users can search ENDF via specialized interfaces, browse sub-libraries or download them as zipped files. Data plots can be generated through the Sigma interface. The ENDF web page also provides access to covariance data processing and plots. (Specialized Interface)
Confidence Sets for Network Structure Edoardo M. Airoldi1
Needleman, Daniel
Received 2 November 2010; revised 4 June 2011; accepted 26 July 2011 DOI:10.1002/sam.10136 Published online, and school year as covariates. We employ a stochastic expectation-maximization algorithm to fit a logistic regression model that includes these explanatory variables as well as a latent stochastic blockmodel
Kockelman, Kara M.
(fatal or incapacitating) and non-severe crash rates reflects latent covariates that have impacts across and William J. Murray Jr. Fellow Department of Civil, Architectural and Environmental Engineering in Accident Analysis & Prevention ABSTRACT This work examines the relationship between 3-year pedestrian crash
Vertical Integration in Gasoline Supply: An Empirical Test of Raising Rivals' Costs
California at Berkeley. University of
gasoline prices. The 1997 acquisition of Unocal's West Coast refining and marketing assets by Tosco, and potentially confounding city-specific covariates. We find that Tosco increased the wholesale price of gasoline During the week of January 4-8, 1999, the average wholesale price of unbranded regular gasoline was 46
Dobigeon, Nicolas
truncated on a simplex Nicolas Dobigeon and Jean-Yves Tourneret E-mail: dobigeon@umich.edu TECHNICAL REPORT simplex: S = r 0, r = 1, . . . , R - 1, R-1 r=1 r 1 , (1) Let NS(A, B) denote the truncated multivariate normal distribution defined on the simplex S with mean vector A and covariance matrix B
Efficient sampling according to a multivariate Gaussian distribution truncated on a simplex
Dobigeon, Nicolas
1 Efficient sampling according to a multivariate Gaussian distribution truncated on a simplex I. PROBLEM STATEMENT Let S denote the following simplex defined on RR-1 : S = r 0, r = 1) defined on the simplex S with mean vector A and covariance matrix B. The probability density function (pdf
PÃ¡zsit, Imre
.iop.org/PhysScr/74/62 Abstract The master equation approach, which has traditionally been used for the calculation a stationary external source. The first two factorial moments are calculated, including the covariance to as `zero power reactor noise', are due to the inherent statistical properties of the individual neutron
Siegel's formula via Stein's identities Department of Statistics
Liu, Jun
Siegel's formula via Stein's identities Jun S. Liu Department of Statistics Harvard University Abstract Inspired by a surprising formula in Siegel (1993), we find it convenient to compute covariances, even for order statistics, by using Stein (1972)'s identities. Generalizations of Siegel's formula
Best Linear Unbiased Estimate Motivation for BLUE
Fowler, Mark
1 Chapter 6 Best Linear Unbiased Estimate (BLUE) #12;2 Motivation for BLUE Except for Linear Model to a sub-optimal estimate BLUE is one such sub-optimal estimate Idea for BLUE: 1. Restrict estimate) Advantage of BLUE:Needs only 1st and 2nd moments of PDF Mean & Covariance Disadvantages of BLUE: 1. Sub
An Adjoint-Based Adaptive Ensemble Kalman Filter
Song, Hajoon
A new hybrid ensemble Kalman filter/four-dimensional variational data assimilation (EnKF/4D-VAR) approach is introduced to mitigate background covariance limitations in the EnKF. The work is based on the adaptive EnKF ...
Control and Intelligent Systems, Vol. 35, No. 2, 2007 REDUCED ORDER KALMAN FILTERING
Simon, Dan
Control and Intelligent Systems, Vol. 35, No. 2, 2007 REDUCED ORDER KALMAN FILTERING WITHOUT MODEL REDUCTION D. Simon* Abstract This paper presents an optimal discrete time reduced order Kalman filter of the estimation error covariance. Key Words Kalman filter, state estimatioh, order reduction 1. Introduction
Detection of Broken Bars in Induction Motors Using an Extended Kalman Filter
Paris-Sud XI, Université de
Detection of Broken Bars in Induction Motors Using an Extended Kalman Filter for Rotor Resistance and currents are processed by an Extended Kalman Filter for the speed and rotor resistance simultaneous bars. In the proposed extended Kalman Filter approach, the state covariance matrix is adequacy weighted
Kalman filtering with unknown inputs via optimal state estimation of singular systems
Paris-Sud XI, Université de
1 Kalman filtering with unknown inputs via optimal state estimation of singular systems M. DAROUACH de Lorraine, 54400 COSNES ET ROMAIN, FRANCE A new method for designing a Kalman filter for linear the Kalman filter, it is generally assumed that all system parameters, noise covariances, and inputs
Dependent Gaussian Processes Phillip Boyle and Marcus Frean
Frean, Marcus
in non-linear regression [8, 18], extended to handle classification tasks [11, 17, 6], and used to handle multiple, coupled outputs. 1 Introduction Gaussian process regression has many desirable covariance functions is to treat GPs as the outputs of stable linear filters. For a linear filter, the output
West, Mike
of covariates to use in regression or generalized linear models is a ubiquitous problem. The Bayesian paradigm regression and binary re- gression with non-orthogonal design matrices in conjunction with independent "spike and kernel regression (Clyde and George 2004). The generalization of the Gaussian linear model to other
Support vector methods for survival analysis: a comparison between ranking and regression
techniques for the estimation of non-linear transformation models for the analysis of survival data. Methods is the use of non-linear kernels im- plementing automatically non-parametric effects of the covariates the advantage that they are easily extendable towards non-linear models without the need to check non-linearities
Censored Depth Quantiles M. Debruyne a
regression has been extended to many possible settings, such as non-linear and non-parametric regression, time series, etc. (Koenker, 2005). In this paper we focus on linear quantile regression with right the regression quantiles in a linear regression setting with response variable Y and covariates x
Quasi-local energy-momentum and energy flux at null infinity
Xiaoning Wu; Chiang-Mei Chen; James M. Nester
2005-06-02T23:59:59.000Z
The null infinity limit of the gravitational energy-momentum and energy flux determined by the covariant Hamiltonian quasi-local expressions is evaluated using the NP spin coefficients. The reference contribution is considered by three different embedding approaches. All of them give the expected Bondi energy and energy flux.
Electromagnetic radiation and motion of arbitrarily shaped particle
Jozef Klacka
2001-07-06T23:59:59.000Z
Covariant form of equation of motion for arbitrarily shaped particle in the electromagnetic radiation field is presented. Equation of motion in the proper frame of the particle uses the radiation pressure cross section 3 $\\times$ 3 matrix. The obtained equation of motion is compared with known result.
Electromagnetic Radiation and Motion of Real Particle
Jozef Klacka
2001-06-21T23:59:59.000Z
Relativistically covariant equation of motion for real dust particle under the action of electromagnetic radiation is derived. The particle is neutral in charge. Equation of motion is expressed in terms of particle's optical properties, standardly used in optics for stationary particles.
Video Mining with Frequent Itemset Configurations
Paris-Sud XI, Université de
Video Mining with Frequent Itemset Configurations Till Quack1 , Vittorio Ferrari2 , and Luc Van Gool1 1 ETH Zurich 2 LEAR - INRIA Grenoble Abstract. We present a method for mining frequently arrangements of affine covariant regions. Our mining method is based on the class of frequent itemset mining
Analysis of Censored Environmental Data with Box-Cox Transformations
District of Columbia, University of the
the likelihood function over a fixed power transformation set. To estimate the mean vector and the covariance in selecting the correct power transformation and the coverage rate of the confidence region under several in an environment (e.g., air, water, soil) is often used as a direct measure of dose. However, in most cases
Agricultural and Forest Meteorology 182183 (2013) 7690 Contents lists available at ScienceDirect
Chen, Jiquan
2013-01-01T23:59:59.000Z
of the carbon and water fluxes of terrestrial ecosystems in China are not well understood due to the lack covariance flux sites across China, and examined the carbon fluxes, evapotranspiration (ET), and water useDirect Agricultural and Forest Meteorology journal homepage: www.elsevier.com/locate/agrformet Carbon fluxes
, 7]. Over the last years, many im- provements have been introduced in HMM-based speech syn- thesis models of multiple levels, e.g. state and phone levels [13], state, phone and syllable levels [14], using full covariance Gaussian distribu- tion [15] or implementing Gamma distribution instead of Gaus- sian
SEPARATION OF OVERLAPPED ELECTROCHEMICAL PEAKS USING THE KALMAN FILTER
Brown, T.F.
2013-01-01T23:59:59.000Z
Covariance Update for a 11 k ,j _0_(kjk-l)::: !! (k,k-l)·! (k-llk-1) T P(kjk-1) = H·P(k-ljk-l)·H + Q(k) f(k) = f(kjk-l)·iT(k)·[i~f(kjk~l)·iT + ~]-l ! (
Small Quarkonium states in an anisotropic QCD plasma
Yun Guo
2008-05-16T23:59:59.000Z
We determine the hard-loop resummed propagator in an anisotropic QCD plasma in general covariant gauges and define a potential between heavy quarks from the Fourier transform of its static limit. We find that the potential exhibits angular dependence and that binding of very small quarkonium states is stronger than in an isotropic plasma.
Model Validation and Spatial Interpolation by Combining Observations with Outputs from Numerical
Washington at Seattle, University of
""r,c,rn The authors are for hel]JfuI #12;Abstract Constructing maps of pollution levels is vital for air quality concentrations. Key tlJords: air pollution, Ba~yesian inference, change of support, likelihood approaches, Matern Resolutions 2.5 Modeling a Nonstationary Covariance . 3 Estimation 3.1 Algorithm 4 Application: Air Pollution
Atmospheric Environment 38 (2004) 44274436 Statistical comparison of observed and CMAQ modeled daily
Jun, Mikyoung
2004-01-01T23:59:59.000Z
2004 Abstract New statistical procedures to evaluate the Models-3/Community Multiscale Air Quality reserved. Keywords: Air quality model; Model evaluation; Spacetime process; Separable covariance function 1. Introduction The Models-3/Community Multiscale Air Quality (CMAQ) modeling system has been
Stochastic analysis of Bernoulli processes
Privault, Nicolas
2008-01-01T23:59:59.000Z
These notes survey some aspects of discrete-time chaotic calculus and its applications, based on the chaos representation property for i.i.d. sequences of random variables. The topics covered include the Clark formula and predictable representation, anticipating calculus, covariance identities and functional inequalities (such as deviation and logarithmic Sobolev inequalities), and an application to option hedging in discrete time.
Gravitoelectromagnetism and Dark Energy in Superconductors
Clovis Jacinto de Matos
2006-07-03T23:59:59.000Z
A gravitomagnetic analogue of the London moment in superconductors can explain the anomalous Cooper pair mass excess reported by Janet Tate. Ultimately the gravitomagnetic London moment is attributed to the breaking of the principle of general covariance in superconductors. This naturally implies non-conservation of classical energy-momentum. Possible relation with the manifestation of dark energy in superconductors is questioned.
Biogeosciences, 4, 759768, 2007 www.biogeosciences.net/4/759/2007/
Paris-Sud XI, Université de
.lloyd@leeds.ac.uk) ments have, however, suggested much larger estimates for tropical forest carbon sequestration is licensed under a Creative Commons License. Biogeosciences An airborne regional carbon balance for Central for the high Amazonian carbon sink suggested by several pre- vious eddy covariance studies. Large CO2 fluxes
Abstract El'gygytgyn Crater Lake, NE Siberia was investigated for sedimentological proxies for
Long, Bernard
. A bioturbation index based upon these laminated and non- laminated sequences co-varies with total organic carbon that are filtered through storm berms, which limits clastic deposi- tion into the lake system. The sedimentation to magnetic susceptibility include stratigraphy, grain size, clay mineralogy and crystallinity. Earlier work
Duality and exact correlations for a model of heat conduction
C. Giardiná; J. Kurchan; F. Redig
2006-12-07T23:59:59.000Z
We study a model of heat conduction with stochastic diffusion of energy. We obtain a dual particle process which describes the evolution of all the correlation functions. An exact expression for the covariance of the energy exhibits long-range correlations in the presence of a current. We discuss the formal connection of this model with the simple symmetric exclusion process.
decades we witnessed an amazing leap forward in our understanding of the formulation of quantum #12;eld spacetime, their formulation as a locally covariant quantum #12;eld theory, and the associated notion and the fundamental solutions . . . . . . . . . . . . . . . . 15 3 Dirac #12;elds: quantum point of view 19 3
Henson, Rik
LORETA inverse operators, on the metrics dipole localization error (DLE), spatial dispersion (SD) and overall, including individual noise covariance matrices and head geometries. We confirmed that for PSFs DLE improved procedures are used as "spatial filters." While low DLE is advantageous for the localization of a single
Bilateral Kernel-Based Region Detector Woon Cho, Sung-Yeol Kim, Andreas Koschan, and Mongi A. Abidi
Koschan, Andreas
. Introduction The detection of covariant regions from one image and its transformed image has been an important on an image of a Siemens star with regular beams as mentioned in [3]. MSER stably extracts a region for each by different methods on the Siemens image containing Gaussian noise (2%) from [3]. Top left to bottom right
CONDITIONAL VALUE AT RISK \\Lambda Dirk Ormoneit
Ormoneit, Dirk
Stanford, CA 94305Â4065 ormoneit@stat.stanford.edu Ralph Neuneier Siemens AG, ZT IK 4 81730 MÂ¨unchen Germany Ralph.Neuneier@mchp.siemens.de Abstract We suggest a new methodology to overcome several well with the probÂ lem of nonÂnormality by estimating the covariance matrix in a suitably transformed \\Lambda
Outline of the talk Algorithm Application Conclusion Fast computation of wavelet
Paris-Sud XI, Université de
Outline of the talk Algorithm Application Conclusion Fast computation of wavelet coefficients propose a new iterative algorithm for the computation of the covariance matrix of the wavelet coefficients: Since the process is not stationary, it is not true that any wavelet functions will provide stationary
Balanced Risk Set Matching Yunfei Paul Li, Kathleen J. Pr oper t, and Paul R. Rosenbaum
Rosenbaum, Paul R.
pretreatment covariate distance within matched pairs. Under a simple model for the treatment assignment, on the symptoms of IC by using data from the Interstitial Cystitis Data Base (ICDB), a mul- ticenter cohort study of Statistics, The Whar- ton School of the University of Pennsylvania, Philadelphia, PA 19104-6302. The data
Hirani, Amyn
2007-08-07T23:59:59.000Z
…………………………………………………………….. 21 b. Measures……………………………………………………………….. 22 c. Procedure………………………………………………………………. 27 d. Description of Protocol………………………………………………… 27 e. Data Analyses………………………………………………………….. 30 X. RESULTS………………………………………………………………….. 33 vi a... Analysis for Dichotomous PD predicting Posttreatment BDI-II with Pretreatment BDI-II serving as a Covariate……………………………………………… 42 7 Summary of the Linear Regression Analysis for Dichotomous PD predicting Posttreatment HRSD with Pretreatment HRSD...
Ecosystem CO2/H2O fluxes are explained by hydraulically limited gas exchange during
(Dendroctonus rufipennis) is the major insect disturbance in the subalpine spruce-fir forests of North America of eddy covariance flux data collected throughout the progression of a spruce beetle (Dendroctonus rufipennis) epidemic in a Wyoming Engelmann spruce (Picea engelmannii)subalpine fir (Abies lasiocarpa
Conserved charges in 3D gravity
Blagojevic, M.; Cvetkovic, B. [University of Belgrade, Institute of Physics, P. O. Box 57, 11001 Belgrade (Serbia)
2010-06-15T23:59:59.000Z
The covariant canonical expression for the conserved charges, proposed by Nester, is tested on several solutions in three-dimensional gravity with or without torsion and topologically massive gravity. In each of these cases, the calculated values of energy momentum and angular momentum are found to satisfy the first law of black hole thermodynamics.
Long-ranged forces and energy non-conservation in (1+1)-dimensions
V. A. Rubakov
1997-11-18T23:59:59.000Z
We consider whether local and causal non-conservation of energy may occur in generally covariant theories with long-ranged fields (analogs of Newton's gravity) whose source is energy--momentum. We find that such a possibility exists in (1+1) dimensions.