National Library of Energy BETA

Sample records for leventis theo covary

  1. Theo Cateforis Curriculum Vitae

    E-Print Network [OSTI]

    McConnell, Terry

    Theo Cateforis Curriculum Vitae Department of Art & Music Histories 308 Bowne Hall Syracuse of New York at Binghamton B.A. Music 1990 EMPLOYMENT Department Chair, Art and Music Histories, Syracuse and Mary 2000-2002 PUBLICATIONS Books Are We Not New Wave? Modern Pop at the Turn of the 1980s. Ann Arbor

  2. 1 Cateforis May 2015 Theo Cateforis

    E-Print Network [OSTI]

    Segraves, Kari A.

    1 Cateforis May 2015 Theo Cateforis Curriculum Vitae Department of Art & Music Histories 308 Bowne University of New York at Binghamton B.A. Music 1990 EMPLOYMENT Department Chair, Art and Music Histories of William and Mary 2000-2002 PUBLICATIONS Books Are We Not New Wave? Modern Pop at the Turn of the 1980s

  3. Smart Doorplate WOLFGANG TRUMLER, FARUK BAGCI, JAN PETZOLD, THEO UNGERER

    E-Print Network [OSTI]

    Ungerer, Theo

    Smart Doorplate WOLFGANG TRUMLER, FARUK BAGCI, JAN PETZOLD, THEO UNGERER Institute for Computer}@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

  4. Smart Doorplate WOLFGANG TRUMLER, FARUK BAGCI, JAN PETZOLD, THEO UNGERER

    E-Print Network [OSTI]

    Ungerer, Theo

    Smart Doorplate WOLFGANG TRUMLER, FARUK BAGCI, JAN PETZOLD, THEO UNGERER Institute for Computer}@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

  5. Manifestly Covariant Relativity

    E-Print Network [OSTI]

    Dalton, K

    1994-01-01

    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.

  6. Manifestly Covariant Relativity

    E-Print Network [OSTI]

    Kenneth Dalton

    2006-08-03

    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.

  7. 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorking With U.S.Week DayDr. Jeffrey publication ofConnectTheory andTheos

  8. Mobile Agents for Wireless Sensor Networks Faruk Bagci1, Julian Wolf1, Theo Ungerer1, and Nader Bagherzadeh2

    E-Print Network [OSTI]

    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

  9. Receding Horizon Covariance Control 

    E-Print Network [OSTI]

    Wendel, Eric

    2012-10-19

    Covariance assignment theory, introduced in the late 1980s, provided the only means to directly control the steady-state error properties of a linear system subject to Gaussian white noise and parameter uncertainty. This theory, however, does...

  10. Electrical conductivity is a parameter that can be used to monitor the entire hardening process of oilwell cement slurries. The theo-

    E-Print Network [OSTI]

    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

  11. COVARIANCE PLASTICITY AND REGULATED CRITICALITY

    E-Print Network [OSTI]

    Lehmann, Daniel

    COVARIANCE PLASTICITY AND REGULATED CRITICALITY Elie Bienenstock Division of Applied Mathematics plasticity may cause the brain to operate near criticality. We analyze the effect of such a regulation of Hebbian covariance plasticity. Such a regulation may bring the system near criticality. We suggest

  12. A Lorentz Covariant Noncommutative Geometry

    E-Print Network [OSTI]

    A. Lewis Licht

    2005-12-13

    A noncommutative geometry that preserves lorentz covariance was introduced by Hartland Snyder in 1947. We show that this geometry has unusual properties under momentum translation, and derive for it a form of star product.

  13. Covariant Geometric Prequantization of Fields

    E-Print Network [OSTI]

    Kanatchikov, I V

    2002-01-01

    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.

  14. Covariant Geometric Prequantization of Fields

    E-Print Network [OSTI]

    I. V. Kanatchikov

    2001-01-04

    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.

  15. Generalized score tests for missing covariate data 

    E-Print Network [OSTI]

    Jin, Lei

    2009-05-15

    In this dissertation, the generalized score tests based on weighted estimating equations are proposed for missing covariate data. Their properties, including the effects of nuisance functions on the forms of the test ...

  16. Progress on Nuclear Data Covariances: AFCI-1.2 Covariance Library

    SciTech Connect (OSTI)

    Oblozinsky,P.; Oblozinsky,P.; Mattoon,C.M.; Herman,M.; Mughabghab,S.F.; Pigni,M.T.; Talou,P.; Hale,G.M.; Kahler,A.C.; Kawano,T.; Little,R.C.; Young,P.G

    2009-09-28

    Improved neutron cross section covariances were produced for 110 materials including 12 light nuclei (coolants and moderators), 78 structural materials and fission products, and 20 actinides. Improved covariances were organized into AFCI-1.2 covariance library in 33-energy groups, from 10{sup -5} eV to 19.6 MeV. BNL contributed improved covariance data for the following materials: {sup 23}Na and {sup 55}Mn where more detailed evaluation was done; improvements in major structural materials {sup 52}Cr, {sup 56}Fe and {sup 58}Ni; improved estimates for remaining structural materials and fission products; improved covariances for 14 minor actinides, and estimates of mubar covariances for {sup 23}Na and {sup 56}Fe. LANL contributed improved covariance data for {sup 235}U and {sup 239}Pu including prompt neutron fission spectra and completely new evaluation for {sup 240}Pu. New R-matrix evaluation for {sup 16}O including mubar covariances is under completion. BNL assembled the library and performed basic testing using improved procedures including inspection of uncertainty and correlation plots for each material. The AFCI-1.2 library was released to ANL and INL in August 2009.

  17. Covariant Lyapunov vectors for rigid disk systems

    E-Print Network [OSTI]

    Hadrien Bosetti; Harald A. Posch

    2010-06-30

    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.

  18. Operator ordering for generally covariant systems

    E-Print Network [OSTI]

    Rafael Ferraro; Daniel M. Sforza

    2000-10-06

    The constraint operators belonging to a generally covariant system are found out within the framework of the BRST formalism. The result embraces quadratic Hamiltonian constraints whose potential can be factorized as a never null function times a gauge invariant function. The building of the inner product between physical states is analyzed for systems featuring either intrinsic or extrinsic time.

  19. SMOOTHING SPLINE GROWTH CURVES WITH COVARIATES

    E-Print Network [OSTI]

    #11;ect growth curves. Due to the repeated measurement structure of his model, he is able to determine adapt the interactive spline model of Wahba to growth curves with covariates. The smoothing spline smoothing spline models (Ch. 10, Wahba (1990)). In this brief article, we adapt interactive spline models

  20. The Pegg-Barnett Formalism and Covariant Phase Observables

    E-Print Network [OSTI]

    Pekka Lahti; Juha-Pekka Pellonpaa

    2001-06-15

    We compare the Pegg-Barnett (PB) formalism with the covariant phase observable approach to the problem of quantum phase and show that PB-formalism gives essentially the same results as the canonical (covariant) phase observable. We also show that PB-formalism can be extended to cover all covariant phase observables including the covariant phase observable arising from the angle margin of the Husimi Q-function.

  1. Covariant Lyapunov Analysis of NavierStokes Turbulence

    E-Print Network [OSTI]

    RIMS­1770 Covariant Lyapunov Analysis of Navier­Stokes 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

  2. Covariant Lyapunov Analysis of Navier-Stokes Turbulence

    E-Print Network [OSTI]

    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

  3. Nuclear fission in covariant density functional theory

    E-Print Network [OSTI]

    A. V. Afanasjev; H. Abusara; P. Ring

    2013-09-12

    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.

  4. A Superdimensional Dual-covariant Field Theory

    E-Print Network [OSTI]

    Yaroslav Derbenev

    2015-08-12

    An approach to a Unified Field Theory (UFT) is developed as an attempt to establish unification of the Theory of Quantum Fields (QFT) and General Theory of Relativity (GTR) on the background of a covariant differential calculus. A dual State Vector field (DSV)consisting of covariant and contravariant N-component functions of variables of a N-dimensional unified manifod (UM)is introduced to represents matter. DSV is supposed to transform in a way distinct from that of the differentials of the UM variables. Consequently, the hybrid tensors and a hybrid affine tensor (Dynamic Connection, DC) are introduced. The hybrid curvature form (HCF) is introduced as a covariant derivative of DC. A system of covariant Euler-Lagrange (EL) equations for DSV, DC, and a twin couple of the triadic hybrid tensors (Split Metric, SM)is derived. A scalar Lagrangian form is composed based on a set of principles suited for UFT, including the homogeneity in the UM space, differential irreducibility and scale invariance. The type of the manifold geometry is not specified in advance, in neither local (signature) nor regional (topology) aspects. Equations for DSV play role of the Schroedinger-Dirac equation in space of UM. By the correspondent EL equations, DC and SM are connected to DSV and become responsible for the non-linear features of the system i.e. interactions. In this paper we mark breaking of a background paradigm of the modern QFT, the superposition principle. The issue of the UM-MF dimensionality will be addressed, and relations to the principles and methodology of QFT and GTR will be discussed.

  5. Impact of the 235U Covariance Data in Benchmark Calculations

    SciTech Connect (OSTI)

    Leal, Luiz C [ORNL] [ORNL; Mueller, Don [ORNL] [ORNL; Arbanas, Goran [ORNL] [ORNL; Wiarda, Dorothea [ORNL] [ORNL; Derrien, Herve [ORNL] [ORNL

    2008-01-01

    The error estimation for calculated quantities relies on nuclear data uncertainty information available in the basic nuclear data libraries such as the U.S. Evaluated Nuclear Data File (ENDF/B). The uncertainty files (covariance matrices) in the ENDF/B library are generally obtained from analysis of experimental data. In the resonance region, the computer code SAMMY is used for analyses of experimental data and generation of resonance parameters. In addition to resonance parameters evaluation, SAMMY also generates resonance parameter covariance matrices (RPCM). SAMMY uses the generalized least-squares formalism (Bayes method) together with the resonance formalism (R-matrix theory) for analysis of experimental data. Two approaches are available for creation of resonance-parameter covariance data. (1) During the data-evaluation process, SAMMY generates both a set of resonance parameters that fit the experimental data and the associated resonance-parameter covariance matrix. (2) For existing resonance-parameter evaluations for which no resonance-parameter covariance data are available, SAMMY can retroactively create a resonance-parameter covariance matrix. The retroactive method was used to generate covariance data for 235U. The resulting 235U covariance matrix was then used as input to the PUFF-IV code, which processed the covariance data into multigroup form, and to the TSUNAMI code, which calculated the uncertainty in the multiplication factor due to uncertainty in the experimental cross sections. The objective of this work is to demonstrate the use of the 235U covariance data in calculations of critical benchmark systems.

  6. On a covariant version of Caianiello's Model

    E-Print Network [OSTI]

    Ricardo Gallego Torrome

    2007-05-23

    Caianiello's derivation of Quantum Geometry through an isometric embedding of the spacetime ({\\bf M},\\tilde{g}) in the pseudo-Riemannian structure ({\\bf T^*M},g^*_{AB}) is reconsidered. In the new derivation, a non-linear connection and the bundle %%@ formalism induce a Lorentzian-type structure in the 4-dimensional manifold {\\bf M} that is covariant %%@ under arbitrary local coordinate transformations in {\\bf M}. If models with maximal acceleration are required to be non-trivial, gravity should be supplied with other interactions in a unification framework.

  7. Covariant Symplectic Structure and Conserved Charges of Topologically Massive Gravity

    E-Print Network [OSTI]

    Caner Nazaroglu; Yavuz Nutku; Bayram Tekin

    2011-06-07

    We present the covariant symplectic structure of the Topologically Massive Gravity and find a compact expression for the conserved charges of generic spacetimes with Killing symmetries.

  8. Optimization Online - Construction of Covariance Matrices with a ...

    E-Print Network [OSTI]

    So Yeon Chun

    2008-06-13

    Jun 13, 2008 ... Construction of Covariance Matrices with a specified Discrepancy Function Minimizer, with Application to Factor Analysis. So Yeon Chun ...

  9. Covariation, Structure and Generalization: Building Blocks of Causal Cognition

    E-Print Network [OSTI]

    Murphy, Robin A.; Mondragón, Esther; Murphy, Victoria A.

    2009-01-01

    old infants. Science, 283, 77-80. Marr, D. (1982). Vision: Ahow covariation is computed. Marr described this distinctionin relation to vision (Marr, 1982). The visual system

  10. A covariant treatment of cosmic parallax

    SciTech Connect (OSTI)

    Räsänen, Syksy, E-mail: syksy.rasanen@iki.fi [University of Helsinki, Department of Physics and Helsinki Institute of Physics, P.O. Box 64, FIN-00014 University of Helsinki (Finland)

    2014-03-01

    The Gaia satellite will soon probe parallax on cosmological distances. Using the covariant formalism and considering the angle between a pair of sources, we find parallax for both spacelike and timelike separation between observation points. Our analysis includes both intrinsic parallax and parallax due to observer motion. We propose a consistency condition that tests the FRW metric using the parallax distance and the angular diameter distance. This test is purely kinematic and relies only on geometrical optics, it is independent of matter content and its relation to the spacetime geometry. We study perturbations around the FRW model, and find that they should be taken into account when analysing observations to determine the parallax distance.

  11. Statistica Sinica 20 (2010), 469-479 NONPARAMETRIC COVARIANCE MODEL

    E-Print Network [OSTI]

    Li, Richard Runze

    2010-01-01

    Statistica Sinica 20 (2010), 469-479 NONPARAMETRIC COVARIANCE MODEL Jianxin Yin1, Zhi Geng1, Runze¨uller and Wang (2005a,b), and Fan, Huang and Li (2007)). Dai and Guo (2004) and Rosen and Stoffer (2007 covariance matrix, although there are #12;470 JIANXIN YIN, ZHI GENG, RUNZE LI AND HANSHENG WANG some

  12. A representation theorem for stochastic processes with separable covariance functions,

    E-Print Network [OSTI]

    for such a proposal, and shows that all processes with continuous separable covariance functions are second-order identical to the product of second-order uncorrelated processes. It discusses the implications of separable relationship between separable covariance functions and a product form for the underlying process, e

  13. Covariant Spectator Theory: Foundations and Applications A Mini-Review of the Covariant Spectator Theory

    SciTech Connect (OSTI)

    Alfred Stadler, Franz Gross

    2010-10-01

    We provide a short overview of the Covariant Spectator Theory and its applications. The basic ideas are introduced through the example of a {phi}{sup 4}-type theory. High-precision models of the two-nucleon interaction are presented and the results of their use in calculations of properties of the two- and three-nucleon systems are discussed. A short summary of applications of this framework to other few-body systems is also presented.

  14. Multivariate Response: Changes in Covariances The proportional change in the genetic covariances is likely to be greater than in

    E-Print Network [OSTI]

    Walsh, Bruce

    35 Multivariate Response: Changes in Covariances The proportional change in the genetic covariances start with development of the multivariate Bulmer's equation for the change in G solely through with an analysis under a general multivariate Gaussian fitness function. This class of fitness functions is very

  15. The importance of covariance in nuclear data uncertainty propagation studies

    SciTech Connect (OSTI)

    Benstead, J. [AWE Plc, Aldermaston, Berkshire (United Kingdom)

    2012-07-01

    A study has been undertaken to investigate what proportion of the uncertainty propagated through plutonium critical assembly calculations is due to the covariances between the fission cross section in different neutron energy groups. The uncertainties on k{sub eff} calculated show that the presence of covariances between the cross section in different neutron energy groups accounts for approximately 27-37% of the propagated uncertainty due to the plutonium fission cross section. This study also confirmed the validity of employing the sandwich equation, with associated sensitivity and covariance data, instead of a Monte Carlo sampling approach to calculating uncertainties for linearly varying systems. (authors)

  16. Estimation of covariance matrix of macroscopic quantum states

    E-Print Network [OSTI]

    László Ruppert; Vladyslav C. Usenko; Radim Filip

    2015-11-20

    For systems analogous to a linear harmonic oscillator, the simplest way to characterize the state is by a covariance matrix containing the symmetrically-ordered moments of position and momentum. We show that without direct access to either position or momentum, the estimation of the covariance matrix of non-classical states is still possible using interference with a classical noisy and low- intensity reference and linear detection of energy. Such a detection technique will allow to estimate macroscopic quantum states of electromagnetic radiation without a coherent high-intensity local oscillator. It can be directly applied to estimate the covariance matrix of macroscopically bright squeezed states of light.

  17. Economical realization of phase covariant devices in arbitrary dimensions

    E-Print Network [OSTI]

    Francesco Buscemi; Giacomo Mauro D'Ariano; Chiara Macchiavello

    2006-06-14

    We describe a unified framework of phase covariant multi user quantum transformations for d-dimensional quantum systems. We derive the optimal phase covariant cloning and transposition tranformations for multi phase states. We show that for some particular relations between the input and output number of copies they correspond to economical tranformations, which can be achieved without the need of auxiliary systems. We prove a relation between the optimal phase covariant cloning and transposition maps, and optimal estimation of multiple phases for equatorial states.

  18. Duality covariant multi-centre black hole systems

    E-Print Network [OSTI]

    Guillaume Bossard; Stefanos Katmadas

    2013-04-24

    We present a manifestly duality covariant formulation of the composite non-BPS and almost-BPS systems of multi-centre black hole solutions in four dimensions. The method of nilpotent orbits is used to define the two systems in terms of first order flow equations that transform covariantly under the duality group. Subsequently, we rewrite both systems of equations in terms of real, manifestly duality covariant, linear systems of Poisson equations. Somewhat unexpectedly, we find that the two systems are naturally described by the same equations involving space dependent abelian isometries that are conjugate to T-dualities by similarity transformations.

  19. AFCI-2.0 Neutron Cross Section Covariance Library

    SciTech Connect (OSTI)

    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.

    2011-03-01

    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.

  20. Generalized covariation and extended Fukushima decompositions for Banach valued processes.

    E-Print Network [OSTI]

    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

  1. Covariant Weyl quantization, symbolic calculus, and the product formula 

    E-Print Network [OSTI]

    Gunturk, Kamil Serkan

    2006-08-16

    A covariant Wigner-Weyl quantization formalism on the manifold that uses pseudo-differential operators is proposed. The asymptotic product formula that leads to the symbol calculus in the presence of gauge and gravitational ...

  2. Covariant formulations of BSSN and the standard gauge

    E-Print Network [OSTI]

    J. David Brown

    2009-05-22

    The BSSN and standard gauge equations are written in covariant form with respect to spatial coordinate transformations. The BSSN variables are defined as tensors with no density weights. This allows us to evolve a given set of initial data using two different coordinate systems and to relate the results using the familiar tensor transformation rules. Two variants of the covariant equations are considered. These differ from one another in the way that the determinant of the conformal metric is evolved.

  3. Covariant Noether Charge for Higher Dimensional Chern-Simons Terms

    E-Print Network [OSTI]

    Tatsuo Azeyanagi; R. Loganayagam; Gim Seng Ng; Maria J. Rodriguez

    2015-07-13

    We construct a manifestly covariant differential Noether charge for theories with Chern-Simons terms in higher dimensional spacetimes. This is in contrast to Tachikawa's extension of the standard Lee-Iyer-Wald formalism which results in a non-covariant differential Noether charge for Chern-Simons terms. On a bifurcation surface, our differential Noether charge integrates to the Wald-like entropy formula proposed by Tachikawa in arXiv:hep-th/0611141.

  4. 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

  5. Addressing spectroscopic quality of covariant density functional theory

    E-Print Network [OSTI]

    A. V. Afanasjev

    2014-09-17

    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.

  6. Manifestly gauge-covariant representation of scalar and fermion propagators

    E-Print Network [OSTI]

    Latosi?ski, Adam

    2015-01-01

    A new way to write the massive scalar and fermion propagators on a background of a weak gauge field is presented. They are written in a form that is manifestly gauge-covariant up to several additional terms that can be written as boundary terms in momentum space. These additional terms violate Ward-Takahashi identities and need to be renormalized by appropriate counterterms if the complete theory is to be gauge-covariant. This form makes it possible to calculate many amplitudes in a manifestly gauge-covariant way (at the same time reducing the number of Feynman diagrams). It also allows to express some counterterms in a way independent of the regularization scheme and provides an easy way to derive the anomalous term affecting the chiral current conservation.

  7. Exploration of regularized covariance estimates with analytical shrinkage intensity for producing invertible covariance matrices in high dimensional hyperspectral data.

    SciTech Connect (OSTI)

    Walsh, Stephen J.; Tardiff, Mark F.

    2007-10-17

    Removing background from hyperspectral scenes is a common step in the process of searching for materials of interest. Some approaches to background subtraction use spectral library data and require invertible covariance matrices for each member of the library. This is challenging because the covariance matrix can be calculated but standard methods for estimating the inverse requires that the data set for each library member have many more spectral measurements than spectral channels, which is rarely the case. An alternative approach is called shrinkage estimation. This method is investigated as an approach to providing an invertible covariance matrix estimate in the case where the number of spectral measurements is less than the number of spectral channels. The approach is an analytic method for arriving at a target matrix and the shrinkage parameter that modify the existing covariance matrix for the data to make it invertible. The theory is discussed to develop di?erent estimates. The resulting estimates are computed and inspected on a set of hyperspectral data. This technique shows some promise for arriving at an invertible covariance estimate for small hyperspectral data sets.

  8. Neutron Resonance Parameters and Covariance Matrix of 239Pu

    SciTech Connect (OSTI)

    Derrien, Herve; Leal, Luiz C; Larson, Nancy M

    2008-08-01

    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.

  9. Inference for Covariate Adjusted Regression via Varying Coefficient Models 1

    E-Print Network [OSTI]

    Müller, Hans-Georg

    ¸ENT¨URK AND HANS-GEORG M¨ULLER University of California, Davis We consider covariate adjusted regression (CAR consider a variant of (1), where one observes contaminated versions of predictors and response. Contamination of the variables in the regression model occurs through a multiplicative factor that is determined

  10. A MODEL FOR PHYLOGENETIC INFERENCE USING STRUCTURAL AND CHEMICAL COVARIATES

    E-Print Network [OSTI]

    Naylor, Gavin

    in DNA sequence data was homogeneous across different classes of base pairs. DNA sequences for eight among all genes. A stochastic model of rate variation based on the interaction of the covariates. These results confirm that there are classes of base pairs that evolve differently, and suggest that models

  11. Covariant Lyapunov Vectors for Rigid Disk Systems Hadrien Bosetti

    E-Print Network [OSTI]

    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

  12. Manufacturing time operators: Covariance, selection criteria, and examples

    SciTech Connect (OSTI)

    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)

    2010-07-15

    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.

  13. Manufacturing time operators: covariance, selection criteria, and examples

    E-Print Network [OSTI]

    G. C. Hegerfeldt; J. G. Muga; J. Muñoz

    2010-05-27

    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.

  14. Covariance matrices for use in criticality safety predictability studies

    SciTech Connect (OSTI)

    Derrien, H.; Larson, N.M.; Leal, L.C.

    1997-09-01

    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.

  15. Robustness of Learning That Is Based on Covariance-Driven Synaptic Plasticity

    E-Print Network [OSTI]

    Robustness of Learning That Is Based on Covariance- Driven Synaptic Plasticity Yonatan Loewenstein of synaptic plasticity rules, in which synaptic changes are driven by covariance, is particularly useful. Covariance-based plasticity is inherently sensitive. Even a slight mistuning of the parameters

  16. Names for Eg(X) Independence Covariance and Correlation The Expected Value

    E-Print Network [OSTI]

    Watkins, Joseph C.

    Names for Eg(X) Independence Covariance and Correlation Topic 8 The Expected Value Functions of Random Variables 1 / 12 #12;Names for Eg(X) Independence Covariance and Correlation Outline Names for Eg(X) Variance and Standard Deviation Independence Covariance and Correlation 2 / 12 #12;Names for Eg

  17. JENDL Actinoid File 2008 and Plan of Covariance Evaluation

    SciTech Connect (OSTI)

    Iwamoto, O. Nakagawa, T.; Otuka, N.; Chiba, S.; Okumura, K.; Chiba, G.

    2008-12-15

    JENDL Actinoid File 2008 (JENDL/AC-2008), which is one of JENDL special purpose files, was released in March 2008. It provides nuclear data for neutron induced nuclear reactions for actinoid nuclides from Ac (Z=89) to Fm (Z=100). The data for 62 nuclides in JENDL-3.3 were revised and newly evaluated data were added for 17 nuclides that have a half-life longer than 1 day. The energy range of incident neutrons is from 10{sup -5} eV to 20 MeV. The nuclear reaction model code CCONE was widely used for the evaluation of cross sections and energy-angular distributions of secondary neutrons in the fast energy region. Covariance data for the fission and capture cross sections and the number of neutrons per fission will be evaluated for important nuclides in JENDL/AC-2008. The evaluation methods and the preliminary results of estimated covariances are presented.

  18. Recent Use of Covariance Data for Criticality Safety Assessment

    SciTech Connect (OSTI)

    Rearden, Bradley T [ORNL; Mueller, Don [ORNL

    2008-01-01

    The TSUNAMI codes of the Oak Ridge National Laboratory SCALE code system were applied to a burnup credit application to demonstrate the use of sensitivity and uncertainty analysis with recent cross section covariance data for criticality safety code and data validation. The use of sensitivity and uncertainty analysis provides for the assessment of a defensible computational bias, bias uncertainty, and gap analysis for a complex system that otherwise could be assessed only through the use of expert judgment and conservative assumptions.

  19. Bilinear covariants and spinor fields duality in quantum Clifford algebras

    SciTech Connect (OSTI)

    Ab?amowicz, Rafa?; Gonçalves, Icaro; Rocha, Roldão da

    2014-10-15

    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.

  20. The covariant formulation of $f(T)$ gravity

    E-Print Network [OSTI]

    Krššák, Martin

    2015-01-01

    We show that the well-known problem of frame dependence and violation of local Lorentz invariance in the usual formulation of $f(T)$ gravity is a consequence of neglecting the role of spin connection. We re-formulate $f(T)$ gravity starting, instead of the "pure-tetrad" teleparallel gravity, from the covariant teleparallel gravity, using both the tetrad and the spin connection as dynamical variables, resulting in the fully covariant, consistent, and frame-independent, version of $f(T)$ gravity, which does not suffer from the notorious problems of the usual, pure-tetrad, $f(T)$ theory. We present the method to extract solutions for the most physically important cases, such as the Minkowski, the FRW and the spherically-symmetric ones. We show that in the covariant $f(T)$ gravity we are allowed to use an arbitrary tetrad in an arbitrary coordinate system along with the corresponding spin connection, resulting always to the same physically relevant field equations.

  1. Relativistic (covariant) kinetic theory of linear plasma waves and instabilities

    SciTech Connect (OSTI)

    Lazar, M. [Institut fuer Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany); 'Alexandru Ioan Cuza' University, Faculty of Physics, 6600 Iasi (Romania); Schlickeiser, R. [Institut fuer Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany); Centre for Plasma Science and Astrophysics, Ruhr-University, D-44780 Bochum (Germany)

    2006-06-19

    The fundamental kinetic description is of vital importance in high-energy astrophysics and fusion plasmas where wave phenomena evolve on scales small comparing with binary collision scales. A rigorous relativistic analysis is required even for nonrelativistic plasma temperatures for which the classical theory yielded unphysical results: e.g. collisonless damping of superluminal waves (phase velocity exceeds the speed of light). The existing nonrelativistic approaches are now improved by covariantly correct dispersion theory. As an important application, the Weibel instability has been recently investigated and confirmed as the source of primordial magnetic field in the intergalactic medium.

  2. Lorentz covariance and gauge invariance in the proton spin problem

    E-Print Network [OSTI]

    S. C. Tiwari

    2014-09-01

    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.

  3. Hybrid stars within a covariant, nonlocal chiral quark model

    E-Print Network [OSTI]

    D. B. Blaschke; D. Gomez Dumm; A. G. Grunfeld; T. Klahn; N. N. Scoccola

    2007-05-16

    We present a hybrid equation of state (EoS) for dense matter in which a nuclear matter phase is described within the Dirac-Brueckner-Hartree-Fock (DBHF) approach and a two-flavor quark matter phase is modelled according to a recently developed covariant, nonlocal chiral quark model. We show that modern observational constraints for compact star masses (M ~ 2 M_sun) can be satisfied when a small vector-like four quark interaction is taken into account. The corresponding isospin symmetric EoS is consistent with flow data analyses of heavy ion collisions and points to a deconfinement transition at about 0.55 fm^-3.

  4. Role of Experiment Covariance in Cross Section Adjustments

    SciTech Connect (OSTI)

    Giuseppe Palmiotti; M. Salvatores

    2014-06-01

    This paper is dedicated to the memory of R. D. McKnight, which gave a seminal contribution in establishing methodology and rigorous approach in the evaluation of the covariance of reactor physics integral experiments. His original assessment of the ZPPR experiment uncertainties and correlations has made nuclear data adjustments, based on these experiments, much more robust and reliable. In the present paper it has been shown with some numerical examples the actual impact on an adjustment of accounting for or neglecting such correlations.

  5. Light propagation in generally covariant electrodynamics and the Fresnel equation

    E-Print Network [OSTI]

    Friedrich W. Hehl; Yuri N. Obukhov; Guillermo F. Rubilar

    2002-03-28

    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.

  6. Application of covariant analytic mechanics with differential forms to gravity with Dirac field

    E-Print Network [OSTI]

    Nakajima, Satoshi

    2015-01-01

    We apply the covariant analytic mechanics with the differential forms to the Dirac field and the gravity with the Dirac field. The covariant analytic mechanics treats space and time on an equal footing regarding the differential forms as the basis variables. A significant feature of the covariant analytic mechanics is that the canonical equations, in addition to the Euler-Lagrange equation, are not only manifestly general coordinate covariant but also gauge covariant. Combining our study and the previous works (the scalar field, the abelian and non-abelian gauge fields and the gravity without the Dirac field), the applicability of the covariant analytic mechanics is checked for all fundamental fields. We study both the first and second order formalism of the gravitational field coupled with matters including the Dirac field. Although the first order formalism does not go well for the Hamilton formalism, the second order formalism can be successfully treated within the framework. It is suggested that the covar...

  7. Anisotropic k-Nearest Neighbor Search Using Covariance Quadtree

    E-Print Network [OSTI]

    Marinho, Eraldo Pereira

    2011-01-01

    We present a variant of the hyper-quadtree that divides a multidimensional space according to the hyperplanes associated to the principal components of the data in each hyperquadrant. Each of the $2^\\lambda$ hyper-quadrants is a data partition in a $\\lambda$-dimension subspace, whose intrinsic dimensionality $\\lambda\\leq d$ is reduced from the root dimensionality $d$ by the principal components analysis, which discards the irrelevant eigenvalues of the local covariance matrix. In the present method a component is irrelevant if its length is smaller than, or comparable to, the local inter-data spacing. Thus, the covariance hyper-quadtree is fully adaptive to the local dimensionality. The proposed data-structure is used to compute the anisotropic K nearest neighbors (kNN), supported by the Mahalanobis metric. As an application, we used the present k nearest neighbors method to perform density estimation over a noisy data distribution. Such estimation method can be further incorporated to the smoothed particle h...

  8. SCALE-6 Sensitivity/Uncertainty Methods and Covariance Data

    SciTech Connect (OSTI)

    Williams, Mark L [ORNL; Rearden, Bradley T [ORNL

    2008-01-01

    Computational methods and data used for sensitivity and uncertainty analysis within the SCALE nuclear analysis code system are presented. The methodology used to calculate sensitivity coefficients and similarity coefficients and to perform nuclear data adjustment is discussed. A description is provided of the SCALE-6 covariance library based on ENDF/B-VII and other nuclear data evaluations, supplemented by 'low-fidelity' approximate covariances. SCALE (Standardized Computer Analyses for Licensing Evaluation) is a modular code system developed by Oak Ridge National Laboratory (ORNL) to perform calculations for criticality safety, reactor physics, and radiation shielding applications. SCALE calculations typically use sequences that execute a predefined series of executable modules to compute particle fluxes and responses like the critical multiplication factor. SCALE also includes modules for sensitivity and uncertainty (S/U) analysis of calculated responses. The S/U codes in SCALE are collectively referred to as TSUNAMI (Tools for Sensitivity and UNcertainty Analysis Methodology Implementation). SCALE-6-scheduled for release in 2008-contains significant new capabilities, including important enhancements in S/U methods and data. The main functions of TSUNAMI are to (a) compute nuclear data sensitivity coefficients and response uncertainties, (b) establish similarity between benchmark experiments and design applications, and (c) reduce uncertainty in calculated responses by consolidating integral benchmark experiments. TSUNAMI includes easy-to-use graphical user interfaces for defining problem input and viewing three-dimensional (3D) geometries, as well as an integrated plotting package.

  9. Solar Proton Burning Process Revisited within a Covariant Model Based on the Bethe-Salpeter Formalism

    E-Print Network [OSTI]

    L. P. Kaptari; B. Kämpfer; E. Grosse

    2000-01-14

    A covariant model based on the Bethe-Salpeter formalism is proposed for investigating the solar proton burning process $pp\\to De^+\

  10. Chiral symmetry and ?-? scattering in the Covariant Spectator Theory

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Biernat, Elmar P.; Peña, M. T.; Ribeiro, J. E.; Stadler, Alfred; Gross, Franz

    2014-11-14

    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. Thus, the Adlermore »self-consistency zero for ?-? scattering in the chiral limit emerges as the result for this sum.« less

  11. A covariant model for the nucleon spin structure

    E-Print Network [OSTI]

    Ramalho, G

    2015-01-01

    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.

  12. Chiral symmetry and ? - ? scattering in the covariant spectator theory

    SciTech Connect (OSTI)

    Biernat, Elmar P; Pena, M. T.; Ribeiro, J. E.; Stadler, Alfred; Gross, Franz

    2014-11-01

    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.

  13. Gross-Neveu and Thirring models. Covariant Gaussian analysis

    SciTech Connect (OSTI)

    Rosenstein, B.; Kovner, A.

    1989-07-15

    Two-dimensional fermionic theories, the SU(/ital N/) Gross-Neveu and themassive Thirring models, are analyzed in the covariant Gaussian approximation.In the Gross-Neveu model we find three phases (renormalizations). In one ofthem the results coincide with the leading order in 1//ital N/ expansion. Inthe other two phases the gap equation has no solution and there are nofermionic excitations in the spectrum of the theory. It is argued that thoserenormalizations are relevant for /ital N/=1,2. The massive Thirringmodel is found to possess a line of ultraviolet fixed points. In the limit/ital m//sub /ital b///r arrow/0 the axial symmetry is not broken. The 2/r arrow/2/ital S/-matrix element for the nonasymptotically free phase is calculated andit qualitatively agrees with the exact expression. We also find anasymptotically free phase with vanishing bare coupling.

  14. CoMoDo: Identifying Dynamic Protein Domains based on Covariances of Motion

    E-Print Network [OSTI]

    Ullmann, G. Matthias

    .75 a These GNM parameter pairs lead to an accordance of at least 90% in the classification as 1-domain covariances upon merging of nodes. The red digits indicate the number of nodes within the cluster. The two boxes show the final classification of the nodes into two clusters. Averaging over all covariances

  15. Covariant energy density functionals: the assessment of global performance across the nuclear landscape

    E-Print Network [OSTI]

    Afanasjev, A V

    2015-01-01

    The assessment of the global performance of the state-of-the-art covariant energy density functionals and related theoretical uncertainties in the description of ground state observables has recently been performed. Based on these results, the correlations between global description of binding energies and nuclear matter properties of covariant energy density functionals have been studied in this contribution.

  16. Covariation of coastal water temperature and microbial pollution at interannual to tidal periods

    E-Print Network [OSTI]

    Winant, Clinton D.

    Covariation of coastal water temperature and microbial pollution at interannual to tidal periods. G. Monismith (2004), Covariation of coastal water temperature and microbial pollution at interannual the relationship between water temperature and fecal pollution in the surf zone at Huntington and Newport Beach

  17. Covariant Lyapunov vectors for rigid disk systems Hadrien Bosetti, Harald A. Posch *

    E-Print Network [OSTI]

    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

  18. Covariant Lyapunov vectors and local exponents Harald A. Posch and Hadrien Bosetti

    E-Print Network [OSTI]

    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

  19. Covariant energy density functionals: the assessment of global performance across the nuclear landscape

    E-Print Network [OSTI]

    A. V. Afanasjev

    2015-08-22

    The assessment of the global performance of the state-of-the-art covariant energy density functionals and related theoretical uncertainties in the description of ground state observables has recently been performed. Based on these results, the correlations between global description of binding energies and nuclear matter properties of covariant energy density functionals have been studied in this contribution.

  20. Large Covariance Matrices: Smooth Models from the 2-Point Correlation Function

    E-Print Network [OSTI]

    O'Connell, Ross; Vargas, Mariana; Ho, Shirley; Padmanabhan, Nikhil

    2015-01-01

    We introduce a new method for estimating the covariance matrix for the galaxy correlation function in surveys of large-scale structure. Our method combines simple theoretical results with a realistic characterization of the survey to dramatically reduce noise in the covariance matrix. For example, with an investment of only ~1,000 CPU hours we can produce a model covariance matrix with noise levels that would otherwise require ~35,000 mocks. Non-Gaussian contributions to the model are calibrated against mock catalogs, after which the model covariance is found to be in impressive agreement with the mock covariance matrix. Since calibration of this method requires fewer mocks than brute force approaches, we believe that it could dramatically reduce the number of mocks required to analyse future surveys.

  1. Covariance of cross-correlations: towards efficient measures for large-scale structure

    E-Print Network [OSTI]

    Robert E. Smith

    2009-06-13

    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.

  2. An evaluation of models for partitioning eddy covariance-measured net ecosystem exchange into photosynthesis and respiration

    E-Print Network [OSTI]

    rights reserved. Keywords: Eddy covariance; Information theory; Net ecosystem exchange; Gross ecosystemAn evaluation of models for partitioning eddy covariance-measured net ecosystem exchange Abstract We measured net ecosystem CO2 exchange (NEE) using the eddy covariance (EC) technique for 4 years

  3. Covariance Analysis of Symmetry Energy Observables from Heavy Ion Collision

    E-Print Network [OSTI]

    Zhang, Yingxun; Li, Zhuxia

    2015-01-01

    Using covariance analysis, we quantify the correlations between the interaction parameters in a transport model and the observables commonly used to extract information of the Equation of State of Asymmetric Nuclear Matter in experiments. By simulating $^{124}$Sn+$^{124}$Sn, $^{124}$Sn+$^{112}$Sn and $^{112}$Sn+$^{112}$Sn reactions at beam energies of 50 and 120 MeV per nucleon, we have identified that the nucleon effective mass splitting are most strongly correlated to the neutrons and protons yield ratios with high kinetic energy from central collisions especially at high incident energy. The best observable to determine the slope of the symmetry energy, L, at saturation density is the isospin diffusion observable even though the correlation is not very strong ($\\sim$0.7). Similar magnitude of correlation but opposite in sign exists for isospin diffusion and nucleon isoscalar effective mass. At 120 MeV/u, the effective mass splitting and the isoscalar effective mass also have opposite correlation for the do...

  4. Particle-vibration coupling within covariant density functional theory

    E-Print Network [OSTI]

    E. Litvinova; P. Ring; V. Tselyaev

    2007-05-08

    Covariant density functional theory, which has so far been applied only within the framework of static and time dependent mean field theory is extended to include Particle-Vibration Coupling (PVC) in a consistent way. Starting from a conventional energy functional we calculate the low-lying collective vibrations in Relativistic Random Phase Approximation (RRPA) and construct an energy dependent self-energy for the Dyson equation. The resulting Bethe-Salpeter equation in the particle-hole ($ph$) channel is solved in the Time Blocking Approximation (TBA). No additional parameters are used and double counting is avoided by a proper subtraction method. The same energy functional, i.e. the same set of coupling constants, generates the Dirac-Hartree single-particle spectrum, the static part of the residual $ph$-interaction and the particle-phonon coupling vertices. Therefore a fully consistent description of nuclear excited states is developed. This method is applied for an investigation of damping phenomena in the spherical nuclei with closed shells $^{208}$Pb and $^{132}$Sn. Since the phonon coupling terms enrich the RRPA spectrum with a multitude of $ph\\otimes$phonon components a noticeable fragmentation of the giant resonances is found, which is in full agreement with experimental data and with results of the semi-phenomenological non-relativistic approach.

  5. Covariance Analysis of Symmetry Energy Observables from Heavy Ion Collision

    E-Print Network [OSTI]

    Yingxun Zhang; M. B. Tsang; Zhuxia Li

    2015-07-24

    Using covariance analysis, we quantify the correlations between the interaction parameters in a transport model and the observables commonly used to extract information of the Equation of State of Asymmetric Nuclear Matter in experiments. By simulating $^{124}$Sn+$^{124}$Sn, $^{124}$Sn+$^{112}$Sn and $^{112}$Sn+$^{112}$Sn reactions at beam energies of 50 and 120 MeV per nucleon, we have identified that the nucleon effective mass splitting are most strongly correlated to the neutrons and protons yield ratios with high kinetic energy from central collisions especially at high incident energy. The best observable to determine the slope of the symmetry energy, L, at saturation density is the isospin diffusion observable even though the correlation is not very strong ($\\sim$0.7). Similar magnitude of correlation but opposite in sign exists for isospin diffusion and nucleon isoscalar effective mass. At 120 MeV/u, the effective mass splitting and the isoscalar effective mass also have opposite correlation for the double n/p and isoscaling p/p yield ratios. By combining data and simulations at different beam energies, it should be possible to place constraints on the slope of symmetry energy (L) and effective mass splitting with reasonable uncertainties.

  6. Covariant Spectator Theory of np scattering: Isoscalar interaction currents

    SciTech Connect (OSTI)

    Gross, Franz L. [JLAB

    2014-06-01

    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.

  7. Covariant two point function for minimally coupled scalar field in de Sitter space-time

    E-Print Network [OSTI]

    Mohammad Vahid Takook

    2000-10-13

    In a recent paper [1], it has been shown that negative norm states are indispensable for a fully covariant quantization of the minimally coupled scalar field in de Sitter space. Their presence, while leaving unchanged the physical content of the theory, offers an automatic and covariant renormalization of the vacuum energy divergence. This paper is a completion of our previous work. An explicit construction of the covariant two-point function of the ``massless'' minimally coupled scalar field in de Sitter space is given, which is free of any infrared divergence. The associated Schwinger commutator function and retarded Green's function are calculated in a fully gauge invariant way, which also means coordinate independent.

  8. Variate Generation for Accelerated Life and Proportional Hazards Models with Time Dependent Covariates

    E-Print Network [OSTI]

    Leemis, Larry

    Variate Generation for Accelerated Life and Proportional Hazards Models with Time Dependent, Monte Carlo simulation, Proportional hazards model, Time dependent covariates, Variate generation. #12 Engineering 202 West Boyd, Room 124 Norman, OK 73019 September, 1989 SUMMARY Variate generation algorithms

  9. Extremal covariant positive operator valued measures: The case of a compact symmetry group

    SciTech Connect (OSTI)

    Carmeli, Claudio; Heinosaari, Teiko; Pellonpaeae, Juha-Pekka; Toigo, Alessandro

    2008-06-15

    Given a unitary representation U of a compact group G and a transitive G-space {omega}, we characterize the extremal elements of the convex set of all U-covariant positive operator valued measures.

  10. Applications of nuclear data covariances to criticality safety and spent fuel characterization

    SciTech Connect (OSTI)

    Williams, Mark L [ORNL] [ORNL; Ilas, Germina [ORNL] [ORNL; Marshall, William BJ J [ORNL] [ORNL; Rearden, Bradley T [ORNL] [ORNL

    2014-01-01

    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.

  11. July 20, 2001; rev. August 16, 2001 General Covariance, Gauge Theories and the Kretschmann

    E-Print Network [OSTI]

    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

  12. Longitudinal Data Analysis Using Multilevel Linear Modeling (MLM): Fitting an Optimal Variance-Covariance Structure 

    E-Print Network [OSTI]

    Lee, Yuan-Hsuan

    2011-10-21

    This dissertation focuses on issues related to fitting an optimal variance-covariance structure in multilevel linear modeling framework with two Monte Carlo simulation studies. In the first study, the author evaluated the ...

  13. Eddy covariance flux measurements of pollutant gases in urban Mexico City

    E-Print Network [OSTI]

    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 ...

  14. Cross-Section Covariance Data Processing with the AMPX Module PUFF-IV

    SciTech Connect (OSTI)

    Wiarda, Dorothea [ORNL; Leal, Luiz C [ORNL; Dunn, Michael E [ORNL

    2011-01-01

    The ENDF community is endeavoring to release an updated version of the ENDF/B-VII library (ENDF/B-VII.1). In the new release several new evaluations containing covariance information have been added, as the community strives to add covariance information for use in programs like the TSUNAMI (Tools for Sensitivity and Uncertainty Analysis Methodology Implementation) sequence of SCALE (Ref 1). The ENDF/B formatted files are processed into libraries to be used in transport calculations using the AMPX code system (Ref 2) or the NJOY code system (Ref 3). Both codes contain modules to process covariance matrices: PUFF-IV for AMPX and ERRORR in the case of NJOY. While the cross section processing capability between the two code systems has been widely compared, the same is not true for the covariance processing. This paper compares the results for the two codes using the pre-release version of ENDF/B-VII.1.

  15. S-wave Splitting Analysis: Covariance Matrix Method and Preliminary Application

    E-Print Network [OSTI]

    Li, Xu

    2004-01-01

    From polarization analysis on a covariance matrix, a method of S-wave splitting analysis is developed, which processes 3-component recordings simultaneously, rather than just 2 horizontal components as done traditionally. ...

  16. Covariant Perturbation Theory (IV). Third Order in the Curvature

    E-Print Network [OSTI]

    A. O. Barvinsky; Yu. V. Gusev; V. V. Zhytnikov; G. A. Vilkovisky

    2009-11-06

    The trace of the heat kernel and the one-loop effective action for the generic differential operator are calculated to third order in the background curvatures: the Riemann curvature, the commutator curvature and the potential. In the case of effective action, this is equivalent to a calculation (in the covariant form) of the one-loop vertices in all models of gravitating fields. The basis of nonlocal invariants of third order in the curvature is built, and constraints arising between these invariants in low-dimensional manifolds are obtained. All third-order form factors in the heat kernel and effective action are calculated, and several integral representations for them are obtained. In the case of effective action, this includes a specially generalized spectral representation used in applications to the expectation-value equations. The results for the heat kernel are checked by deriving all the known coefficients of the Schwinger-DeWitt expansion including $a_3$ and the cubic terms of $a_4$. The results for the effective action are checked by deriving the trace anomaly in two and four dimensions. In four dimensions, this derivation is carried out by several different techniques elucidating the mechanism by which the local anomaly emerges from the nonlocal action. In two dimensions, it is shown by a direct calculation that the series for the effective action terminates at second order in the curvature. The asymptotic behaviours of the form factors are calculated including the late-time behaviour in the heat kernel and the small-$\\Box$ behaviour in the effective action. In quantum gravity, the latter behaviour contains the effects of vacuum radiation including the Hawking effect.

  17. PUFF-III: A Code for Processing ENDF Uncertainty Data Into Multigroup Covariance Matrices

    SciTech Connect (OSTI)

    Dunn, M.E.

    2000-06-01

    PUFF-III is an extension of the previous PUFF-II code that was developed in the 1970s and early 1980s. The PUFF codes process the Evaluated Nuclear Data File (ENDF) covariance data and generate multigroup covariance matrices on a user-specified energy grid structure. Unlike its predecessor, PUFF-III can process the new ENDF/B-VI data formats. In particular, PUFF-III has the capability to process the spontaneous fission covariances for fission neutron multiplicity. With regard to the covariance data in File 33 of the ENDF system, PUFF-III has the capability to process short-range variance formats, as well as the lumped reaction covariance data formats that were introduced in ENDF/B-V. In addition to the new ENDF formats, a new directory feature is now available that allows the user to obtain a detailed directory of the uncertainty information in the data files without visually inspecting the ENDF data. Following the correlation matrix calculation, PUFF-III also evaluates the eigenvalues of each correlation matrix and tests each matrix for positive definiteness. Additional new features are discussed in the manual. PUFF-III has been developed for implementation in the AMPX code system, and several modifications were incorporated to improve memory allocation tasks and input/output operations. Consequently, the resulting code has a structure that is similar to other modules in the AMPX code system. With the release of PUFF-III, a new and improved covariance processing code is available to process ENDF covariance formats through Version VI.

  18. Toward a consistency cross-check of eddy covariance flux–based and biometric estimates of ecosystem carbon balance

    E-Print Network [OSTI]

    2009-01-01

    eddy covariance – based NEP has been tested against itscovariance – based estimates of NEP, GPP and Re but addsbased flux estimates of NEP, GPP, and Re require independent

  19. The manifestly covariant Aharonov-Bohm effect in terms of the 4D fields

    E-Print Network [OSTI]

    Tomislav Ivezic

    2014-11-21

    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.

  20. A birational mapping with a strange attractor: Post critical set and covariant curves

    E-Print Network [OSTI]

    M. Bouamra; S. Hassani; J. -M. Maillard

    2009-06-14

    We consider some two-dimensional birational transformations. One of them is a birational deformation of the H\\'enon map. For some of these birational mappings, the post critical set (i.e. the iterates of the critical set) is infinite and we show that this gives straightforwardly the algebraic covariant curves of the transformation when they exist. These covariant curves are used to build the preserved meromorphic two-form. One may have also an infinite post critical set yielding a covariant curve which is not algebraic (transcendent). For two of the birational mappings considered, the post critical set is not infinite and we claim that there is no algebraic covariant curve and no preserved meromorphic two-form. For these two mappings with non infinite post critical sets, attracting sets occur and we show that they pass the usual tests (Lyapunov exponents and the fractal dimension) for being strange attractors. The strange attractor of one of these two mappings is unbounded.

  1. Review and Assessment of Neutron Cross Section and Nubar Covariances for Advanced Reactor Systems

    SciTech Connect (OSTI)

    Maslov,V.M.; Oblozinsky, P.; Herman, M.

    2008-12-01

    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.

  2. Conditional quantiles when the covariates are curves : an application to Ozone pollution

    E-Print Network [OSTI]

    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

  3. On Sparse Nonparametric Conditional Covariance Selection Mladen Kolar mladenk@cs.cmu.edu

    E-Print Network [OSTI]

    Xing, Eric P.

    covariance selec- tion. This problem has a key role in many modern applications such as finance and com important subtleties of the regulatory networks. Consider another problem in quantitative finance, for which product (GDP), oil price or inflation rate. Unfor- tunately, there is very little domain knowledge

  4. kT/C noise: Covariance matrix calculation of instationary noise in time-varying systems

    E-Print Network [OSTI]

    Noé, Reinhold

    kT/C noise: Covariance matrix calculation of instationary noise in time-varying systems Reinhold kT/C noise is treated analytically, using explicit and implicit notations of differential equations to take into account high integrator bandwidth, slow switching and other methods to mediate kT/C noise

  5. Nanjing, July 26, 2008 Defeng Sun 1 Calibrating Least Squares Covariance Matrix Problems

    E-Print Network [OSTI]

    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

  6. Supplement to First direct measurements of formaldehyde flux via eddy covariance: implications

    E-Print Network [OSTI]

    Meskhidze, Nicholas

    Supplement to First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources J. P. DiGangi1 , E. S. Boyle1 , T. Karl2 , P. Harley2 , A. The concentration of formaldehyde (HCHO) in the cal- ibration mixture was quantified using HITRAN absorption line

  7. Economical phase-covariant cloning of qudits Francesco Buscemi,* Giacomo Mauro D'Ariano,

    E-Print Network [OSTI]

    D'Ariano, Giacomo Mauro

    Economical phase-covariant cloning of qudits Francesco Buscemi,* Giacomo Mauro D'Ariano, and Chiara global and single-qudit fidelity. The map is achieved by an "economical" cloning machine, which works the cloning without the need of an ancilla--a so-called "economical" cloning 11 . As we will see

  8. A Nonparametric Matching Method for Covariate Adjustment with Application to Economic Evaluation

    E-Print Network [OSTI]

    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

  9. Computer representation of the model covariance function resulting from travel-time tomography

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    Karlovu 3, 121 16 Praha 2, Czech Republic, http://sw3d.cz/sta#11;/klimes.htm Summary This paper represents generalization of the equations from interpo- lation of slowness to interpolation of general power of velocity is designed. Keywords Travel{time tomographic inversion, resolution, velocity model, medium covariance func

  10. Covariation and composition of arthropod species across plant genotypes of evening primrose, Oenothera biennis

    E-Print Network [OSTI]

    Agrawal, Anurag

    across five field habitats and studied the arthropod communities that naturally colonized plants. Genetic and Simms 1992, Whitham et al. 2006). Herbivorous and predac- eous arthropods frequently select on geneticCovariation and composition of arthropod species across plant genotypes of evening primrose

  11. DEVELOPMENT OF ENDF/B-VII.1 AND ITS COVARIANCE COMPONENT

    SciTech Connect (OSTI)

    Herman, M.

    2010-04-30

    The US nuclear data community, coordinated by CSEWG, is preparing release of the ENDF/B-VII.1 library. This new release will address deficiencies identified in ENDF/B-VII.0, include improved evaluations for some 50-60 materials and provide covariances for more than 110 materials. The major players in this undertaking are LANL, BNL, ORNL, and LLNL. We summarize deficiencies in the ENDF/B-VII.0 and outline development of the new library. We concentrate on the BNL activities which aim in providing covariances for the materials important for the design of the innovative reactors. Finally we outline a futuristic approach, known as assimilation that tries to link nuclear reaction theory and integral experiments.

  12. Restoration of the covariant gauge ? in the initial field of gravity in de Sitter spacetime

    SciTech Connect (OSTI)

    Cheong, Lee Yen; Yan, Chew Xiao [Department of Fundamental and Applied Sciences, Universiti Teknologi Petronas, Bandar Seri Iskandar, Tronoh 31750, Perak (Malaysia)

    2014-03-05

    The gravitational field generated by a mass term and the initial surface through covariant retarded Green's function for linearized gravity in de Sitter spacetime was studied recently [4, 5] with the covariant gauges set to ? = 2/3 and ? = 5/3. In this paper we extend the work to restore the gauge parameter ? in the field coming from the initial data using the method of shifting the parameter. The ? terms in the initial field cancels exactly with the one coming from the source term. Consequently, the correct field configuration, with two equal mass points moving in its geodesic, one located at the North pole and another one located at the South pole, is reproduced in the whole manifold of de Sitter spacetime.

  13. Dynamical Analysis of Blocking Events: Spatial and Temporal Fluctuations of Covariant Lyapunov Vectors

    E-Print Network [OSTI]

    Schubert, Sebastian

    2015-01-01

    One of the most relevant weather regimes in the mid latitudes atmosphere is the persistent deviation from the approximately zonally symmetric jet stream to the emergence of so-called blocking patterns. Such configurations are usually connected to exceptional local stability properties of the flow which come along with an improved local forecast skills during the phenomenon. It is instead extremely hard to predict onset and decay of blockings. Covariant Lyapunov Vectors (CLVs) offer a suitable characterization of the linear stability of a chaotic flow, since they represent the full tangent linear dynamics by a covariant basis which explores linear perturbations at all time scales. Therefore, we will test whether CLVs feature a signature of the blockings. We examine the CLVs for a quasi-geostrophic beta-plane two-layer model in a periodic channel baroclinically driven by a meridional temperature gradient $\\Delta T$. An orographic forcing enhances the emergence of localized blocked regimes. We detect the blockin...

  14. A covariant model for the $?^\\ast N \\to N^\\ast(1520)$ reaction

    E-Print Network [OSTI]

    G. Ramalho; M. T. Pena

    2014-02-03

    We apply the covariant spectator quark model to the study of the electromagnetic structure of the $N^\\ast(1520)$ state ($J^{P}= \\frac{3}{2}^-$), an important resonance from the second resonance region in both spacelike and timelike regimes. The contributions from the valence quark effects are calculated for the $\\gamma^\\ast N \\to N^\\ast(1520)$ helicity amplitudes. The results are used to parametrize the meson cloud dominant at low $Q^2$.

  15. Quasi-local conserved charges in Lorentz-diffeomorphism covariant theory of gravity

    E-Print Network [OSTI]

    Setare, M R

    2015-01-01

    In this paper, using the combined lorentz-diffeomorphism symmetry, we find a general formula for quasi-local conserved charge of the covariant gravity theories in first order formalism of gravity. Afterwards, we simplify the general formula for Lovelock theory of gravity. Then, we apply the resulting formula to calculating the energy of the Lifshitz black hole solutions of Lovelock theory in any dimension.

  16. 0v{beta}{beta} decay: theoretical nuclear matrix elements and their covariances

    SciTech Connect (OSTI)

    Lisi, Eligio [Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Via Orabona 4, 70126 Bari (Italy)

    2009-11-09

    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.

  17. Nuclear charge-exchange excitations in localized covariant density functional theory

    E-Print Network [OSTI]

    H. Z. Liang; J. Meng; T. Nakatsukasa; Z. M. Niu; P. Ring; X. Roca-Maza; N. Van Giai; P. W. Zhao

    2013-10-15

    The recent progress in the studies of nuclear charge-exchange excitations with localized covariant density functional theory is briefly presented, by taking the fine structure of spin-dipole excitations in 16O as an example. It is shown that the constraints introduced by the Fock terms of the relativistic Hartree-Fock scheme into the particle-hole residual interactions are straightforward and robust.

  18. Entropy Production and Equilibrium Conditions in General-Covariant Continuum Physics

    E-Print Network [OSTI]

    Wolfgang Muschik; Horst-Heino v. Borzeszkowski

    2015-01-03

    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.

  19. A Concise Method for Storing and Communicating the Data Covariance Matrix

    SciTech Connect (OSTI)

    Larson, Nancy M [ORNL

    2008-10-01

    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.

  20. Covariant Differential Identities and Conservation Laws in Metric-Torsion Theories of Gravitation. I. General Consideration

    E-Print Network [OSTI]

    Robert R. Lompay; Alexander N. Petrov

    2013-07-01

    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.

  1. Effects of Selection and Covariance on X-ray Scaling Relations of Galaxy Clusters

    E-Print Network [OSTI]

    B. Nord; R. Stanek; E. Rasia; A. E. Evrard

    2007-06-14

    We explore how the behavior of galaxy cluster scaling relations are affected by flux-limited selection biases and intrinsic covariance among observable properties. Our models presume log-normal covariance between luminosity (L) and temperature (T) at fixed mass (M), centered on evolving, power-law mean relations as a function of host halo mass. Selection can mimic evolution; the \\lm and \\lt relations from shallow X-ray flux-limited samples will deviate from mass-limited expectations at nearly all scales while the relations from deep surveys ($10^{-14} \\cgsflux$) become complete, and therefore unbiased, at masses above $\\sims 2 \\times 10^{14} \\hinv \\msol$. We derive expressions for low-order moments of the luminosity distribution at fixed temperature, and show that the slope and scatter of the \\lt relation observed in flux-limited samples is sensitive to the assumed \\lt correlation coefficient. In addition, \\lt covariance affects the redshift behavior of halo counts and mean luminosity in a manner that is nearly degenerate with intrinsic population evolution.

  2. Pairwise covariance adds little to secondary structure prediction but improves the prediction of non-canonical local structure

    SciTech Connect (OSTI)

    Bystroff, Christopher; Webb-Robertson, Bobbie-Jo M.

    2009-05-06

    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.

  3. Review: Elke Hentschel, Theo Harden: Einführung in die germanistische linguistik

    E-Print Network [OSTI]

    Jesenšek, Vida

    2014-11-01

    Spra- che? Sprachgeschichte. Avtor T. Harden nato v nazorno-pronicljivem slogu pre- ide h kronološki predstavitvi razvoja nemškega jezika. – Razdelek, posve?en dialektologiji, nosi naslov Das ist doch keine Sprache, das ist eine Halskrank- heit. Dia... Spra- che? Sprachgeschichte. Avtor T. Harden nato v nazorno-pronicljivem slogu pre- ide h kronološki predstavitvi razvoja nemškega jezika. – Razdelek, posve?en dialektologiji, nosi naslov Das ist doch keine Sprache, das ist eine Halskrank- heit. Dia...

  4. Covariant formulation of spatially non-symmetric kinetic equilibria in magnetized astrophysical plasmas

    SciTech Connect (OSTI)

    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)

    2014-05-15

    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.

  5. General form of the covariant field equations of arbitrary spin and the relativistic canonical quantum mechanics

    E-Print Network [OSTI]

    Simulik, V M

    2015-01-01

    The investigation of arXiv 1409.2766v2 [quant-ph] has been continued by the general form of the numerous equations with partial values of arbitrary spin, which were considered in above mentioned preprint. The general forms of quantum-mechanical and covariant equations for arbitrary spin together with the general description of the arbitrary spin field formalism are presented. The corresponding relativistic quantum mechanics of arbitrary spin is given as the system of axioms. Previously ignored partial example of the spin s=(0,0) particle-antiparticle doublet is considered. The partial example of spin s=(3/2,3/2) particle-antiparticle doublet is highlighted. The new 64 dimensional Clifford--Dirac algebra over the field of real numbers is suggested. The general operator, which transformed the relativistic canonical quantum mechanics of arbitrary spin into the locally covariant field theory, has been introduced. Moreover, the study of the place of the results given in arXiv 1409.2766v2 [quant-ph] among the resul...

  6. Deformed Hamilton-Jacobi Method in Covariant Quantum Gravity Effective Models

    E-Print Network [OSTI]

    Mu Benrong; Peng Wang; Haitang Yang

    2014-08-21

    We first briefly revisit the original Hamilton-Jacobi method and show that the Hamilton-Jacobi equation for the action $I$ of tunnelings of a fermionic particle from a charged black hole can be written in the same form as that of a scalar particle. For the low energy quantum gravity effective models which respect covariance of the curved spacetime, we derive the deformed model-independent KG/Dirac and Hamilton-Jacobi equations using the methods of effective field theory. We then find that, to all orders of the effective theories, the deformed Hamilton-Jacobi equations can be obtained from the original ones by simply replacing the mass of emitted particles $m$ with a parameter $m_{eff}$ that includes all the quantum gravity corrections. Therefore, in this scenario, there will be no corrections to the Hawking temperature of a black hole from the quantum gravity effects if its original Hawking temperature is independent of the mass of emitted particles. As a consequence, our results show that breaking covariance in quantum gravity effective models is a key for a black hole to have the remnant left in the evaporation.

  7. Deformed Hamilton-Jacobi Method in Covariant Quantum Gravity Effective Models

    E-Print Network [OSTI]

    Benrong, Mu; Yang, Haitang

    2014-01-01

    We first briefly revisit the original Hamilton-Jacobi method and show that the Hamilton-Jacobi equation for the action $I$ of tunnelings of a fermionic particle from a charged black hole can be written in the same form as that of a scalar particle. For the low energy quantum gravity effective models which respect covariance of the curved spacetime, we derive the deformed model-independent KG/Dirac and Hamilton-Jacobi equations using the methods of effective field theory. We then find that, to all orders of the effective theories, the deformed Hamilton-Jacobi equations can be obtained from the original ones by simply replacing the mass of emitted particles $m$ with a parameter $m_{eff}$ that includes all the quantum gravity corrections. Therefore, in this scenario, there will be no corrections to the Hawking temperature of a black hole from the quantum gravity effects if its original Hawking temperature is independent of the mass of emitted particles. As a consequence, our results show that breaking covariance...

  8. Unified Field Theory From Enlarged Transformation Group. The Covariant Derivative for Conservative Coordinate Transformations and Local Frame Transformations

    E-Print Network [OSTI]

    Edward Lee Green

    2009-08-25

    Pandres has developed a theory in which the geometrical structure of a real four-dimensional space-time is expressed by a real orthonormal tetrad, and the group of diffeomorphisms is replaced by a larger group called the conservation group. This paper extends the geometrical foundation for Pandres' theory by developing an appropriate covariant derivative which is covariant under all local Lorentz (frame) transformations, including complex Lorentz transformations, as well as conservative transformations. After defining this extended covariant derivative, an appropriate Lagrangian and its resulting field equations are derived. As in Pandres' theory, these field equations result in a stress-energy tensor that has terms which may automatically represent the electroweak field. Finally, the theory is extended to include 2-spinors and 4-spinors.

  9. A covariant model for the gamma N -> N(1535) transition at high momentum transfer

    SciTech Connect (OSTI)

    G. Ramalho, M.T. Pena

    2011-08-01

    A relativistic constituent quark model is applied to the gamma N -> N(1535) transition. The N(1535) wave function is determined by extending the covariant spectator quark model, previously developed for the nucleon, to the S11 resonance. The model allows us to calculate the valence quark contributions to the gamma N -> N(1535) transition form factors. Because of the nucleon and N(1535) structure the model is valid only for Q^2> 2.3 GeV^2. The results are compared with the experimental data for the electromagnetic form factors F1* and F2* and the helicity amplitudes A_1/2 and S_1/2, at high Q^2.

  10. Time-odd mean fields in covariant density functional theory I. Non-rotating systems

    E-Print Network [OSTI]

    A. V. Afanasjev; H. Abusara

    2010-10-09

    Time-odd mean fields (nuclear magnetism) are analyzed in the framework of covariant density functional theory (CDFT). It is shown that they always provide additional binding to the binding energies of odd-mass nuclei. This additional binding only weakly depends on the RMF parametrization reflecting good localization of the properties of time-odd mean fields in CDFT. The underlying microscopic mechanism is discussed in detail. Time-odd mean fields affect odd-even mass differences. However, our analysis suggests that the modifications of the strength of pairing correlations required to compensate for their effects are modest. In contrast, time-odd mean fields have profound effect on the properties of odd-proton nuclei in the vicinity of proton-drip line. Their presence can modify the half-lives of proton-emitters (by many orders of magnitude in light nuclei) and affect considerably the possibilities of their experimental observation.

  11. Isospin coupling-channel decomposition of nuclear symmetry energy in covariant density functional theory

    E-Print Network [OSTI]

    Qian Zhao; Bao Yuan Sun; Wen Hui Long

    2014-11-23

    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.

  12. K+'s Collective Flow in Heavy-ion Collisions predicted by Covariant Kaon Dynamics

    E-Print Network [OSTI]

    Yong-Zhong Xing; Yue-Qian Dai; Yu-Ming Zheng

    2014-11-03

    The directed and elliptic flows of positively charged Kaon produced in $^{58}_{28}$Ni + $^{58}_{28}$Ni reaction at incident kinetic energy 1.91 AGeV, experimental data are released newly by V. Zinyuk,et.al. in Ref.[arXiv: 1403.1504v2 [nucl-ex] 8 Apr 2014], are reproduced by using the covariant kaon dynamics. Our numerical results indicate qualitatively the Lorentz force is necessary to explained reasonably the data as soon as the space-like part of kaon's vector potential is involved. The sensitivity of $K^+$ directed as well as differential directed flow on the Lorentz force are also observed near target rapidity.

  13. Nuclear matrix elements in neutrinoless double beta decay: beyond mean-field covariant density functional theory

    E-Print Network [OSTI]

    Yao, J M; Hagino, K; Ring, P; Meng, J

    2014-01-01

    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.

  14. Quarkonia and heavy-light mesons in a covariant quark model

    E-Print Network [OSTI]

    Leitão, Sofia; Peña, M T; Biernat, Elmar P

    2015-01-01

    Preliminary calculations using the Covariant Spectator Theory (CST) employed a scalar linear confining interaction and an additional constant vector potential to compute the mesonic mass spectra. In this work we generalize the confining interaction to include more general structures, in particular a vector and also a pseudoscalar part, as suggested by a recent study. A one-gluon-exchange kernel is also implemented to describe the short-range part of the interaction. We solve the simplest CST approximation to the complete Bethe-Salpeter equation, the one-channel spectator equation, using a numerical technique that eliminates all singularities from the kernel. The parameters of the model are determined through a fit to the experimental pseudoscalar meson spectra, with a good agreement for both quarkonia and heavy-light states.

  15. Covariant spectator theory for the electromagnetic three-nucleon form factors: Complete impulse approximation

    SciTech Connect (OSTI)

    Alexandre Pinto, SÂ ergio; Stadler, Alfred; Gross, Franz

    2009-01-01

    We present the first calculations of the electromagnetic form factors of 3He and 3H within the framework of the Covariant Spectator Theory (CST). This first exploratory study concentrates on the sensitivity of the form factors to the strength of the scalar meson-nucleon off-shell coupling, known from previous studies to have a strong influence on the three-body binding energy. Results presented here were obtained using the complete impulse approximation (CIA), which includes contributions of relativistic origin that appear as two-body corrections in a non-relativistic framework, such as ?Z-graphs?, but omits other two and three-body currents. We compare our results to non-relativistic calculations augmented by relativistic corrections of O(v/c)2.

  16. Covariant spectator theory for the electromagnetic three-nucleon form factors: Complete impulse approximation

    SciTech Connect (OSTI)

    Sergio Alexandre Pinto, Alfred Stadler, Franz Gross

    2009-05-01

    We present the first calculations of the electromagnetic form factors of 3He and 3H within the framework of the Covariant Spectator Theory (CST). This first exploratory study concentrates on the sensitivity of the form factors to the strength of the scalar meson-nucleon off-shell coupling, known from previous studies to have a strong influence on the three-body binding energy. Results presented here were obtained using the complete impulse approximation (CIA), which includes contributions of relativistic origin that appear as two-body corrections in a non-relativistic framework, such as #28;Z-graphs#29;, but omits other two and three-body currents. We compare our results to non-relativistic calculations augmented by relativistic corrections of O(v/c)2.

  17. Covariant spectator theory for the electromagnetic three-nucleon form factors: Complete impulse approximation

    SciTech Connect (OSTI)

    Pinto, Sergio Alexandre; Stadler, Alfred; Gross, Franz

    2009-05-15

    We present the first calculations of the electromagnetic form factors of {sup 3}He and {sup 3}H within the framework of the Covariant Spectator Theory (CST). This first exploratory study concentrates on the sensitivity of the form factors to the strength of the scalar meson-nucleon off-shell coupling, known from previous studies to have a strong influence on the three-body binding energy. Results presented here were obtained using the complete impulse approximation (CIA), which includes contributions of relativistic origin that appear as two-body corrections in a nonrelativistic framework, such as 'Z-graphs', but omits other two and three-body currents. We compare our results to nonrelativistic calculations augmented by relativistic corrections of O(v/c){sup 2}.

  18. Dynamical Analysis of Blocking Events: Spatial and Temporal Fluctuations of Covariant Lyapunov Vectors

    E-Print Network [OSTI]

    Sebastian Schubert; Valerio Lucarini

    2015-08-17

    One of the most relevant weather regimes in the mid latitudes atmosphere is the persistent deviation from the approximately zonally symmetric jet stream to the emergence of so-called blocking patterns. Such configurations are usually connected to exceptional local stability properties of the flow which come along with an improved local forecast skills during the phenomenon. It is instead extremely hard to predict onset and decay of blockings. Covariant Lyapunov Vectors (CLVs) offer a suitable characterization of the linear stability of a chaotic flow, since they represent the full tangent linear dynamics by a covariant basis which explores linear perturbations at all time scales. Therefore, we will test whether CLVs feature a signature of the blockings. We examine the CLVs for a quasi-geostrophic beta-plane two-layer model in a periodic channel baroclinically driven by a meridional temperature gradient $\\Delta T$. An orographic forcing enhances the emergence of localized blocked regimes. We detect the blocking events of the channel flow with a Tibaldi-Molteni scheme adapted to the periodic channel. When blocking occurs, the global growth rates of the fastest growing CLVs are significantly higher. Hence against intuition, globally the circulation is more unstable in blocked phases. Such an increase in the finite time Lyapunov exponents with respect to the long term average is attributed to stronger barotropic and baroclinic conversion in the case of high temperature gradients, while for low values of $\\Delta T$, the effect is only due to stronger barotropic instability. For the localization of the CLVs, we compare the meridionally averaged variance of the CLVs during blocked and unblocked phases. We find that on average the variance of the CLVs is clustered around the center of blocking. These results show that the blocked flow affects all time scales and processes described by the CLVs.

  19. Title: Optimal Replacement in the Proportional Hazards Model with semi-Markovian Covariate Process and Continuous Monitoring

    E-Print Network [OSTI]

    Ryan, Sarah M.

    Process and Continuous Monitoring Index terms--Optimal replacement, proportional hazards model, semi1 Title: Optimal Replacement in the Proportional Hazards Model with semi-Markovian Covariate replacement problem for general deteriorating systems in the proportional hazards model with a semi

  20. Deep-Sea Research II 48 (2001) 1823}1836 Covariation of mesoscale ocean color and sea-surface

    E-Print Network [OSTI]

    McGillicuddy Jr., Dennis J.

    2001-01-01

    Deep-Sea Research II 48 (2001) 1823}1836 Covariation of mesoscale ocean color and sea Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA and result in the accumulation of biomass in the overlying waters (McGillicuddy et al., 1999). Shipboard

  1. Proposal of an eavesdropping experiment for BB84 QKD protocol with 1-3 phase-covariant quantum cloner

    E-Print Network [OSTI]

    Yuta Okubo; Francesco Buscemi; Akihisa Tomita

    2008-06-11

    We propose an eavesdropping experiment with linear optical 1-3 phase-covariant quantum cloner. In this paper, we have designed an optical circuit of the cloner and shown how the eavesdropper (Eve) utilizes her clones. We have also optimized the measurement scheme for Eve by numerical calculation. The optimized measurement is easy to implement with liner optics.

  2. ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data

    E-Print Network [OSTI]

    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

  3. Covariance of dark energy parameters and sound speed constraints from large HI surveys

    E-Print Network [OSTI]

    A. Torres-Rodriguez; C. M. Cress; K. Moodley

    2008-04-15

    An interesting probe of the nature of dark energy is the measure of its sound speed, $c_s$. We review the significance for constraining sound speed models of dark energy using large neutral hydrogen (HI) surveys with the Square Kilometre Array (SKA). Our analysis considers the effect on the sound speed measurement that arises from the covariance of $c_s$ with the dark energy density, $\\Omega_\\LLambda$, and a time-varying equation of state, $w(a)=w_0+(1-a)w_a$. We find that the approximate degeneracy between dark energy parameters that arises in power spectrum observations is lifted through redshift tomography of the HI-galaxy angular power spectrum, resulting in sound speed constraints that are not severely degraded. The cross-correlation of the galaxy and the integrated Sachs-Wolfe (ISW) effect spectra contributes approximately 10 percent of the information that is needed to distinguish variations in the dark energy parameters, and most of the discriminating signal comes from the galaxy auto-correlation spectrum. We also find that the sound speed constraints are weakly sensitive to the HI bias model. These constraints do not improve substantially for a significantly deeper HI survey since most of the clustering sensitivity to sound speed variations arises from $z \\lsim 1.5$. A detection of models with sound speeds close to zero, $c_s \\lsim 0.01,$ is possible for dark energy models with $w\\gsim -0.9$.

  4. Deriving Daytime Variables From the AmeriFlux Standard Eddy Covariance Data Set

    SciTech Connect (OSTI)

    van Ingen, Catharine; Agarwal, Deborah A.; Humphrey, Marty; Li, Jie

    2008-12-06

    A gap-filled, quality assessed eddy covariance dataset has recently become available for the AmeriFluxnetwork. This dataset uses standard processing and produces commonly used science variables. This shared dataset enables robust comparisons across different analyses. Of course, there are many remaining questions. One of those is how to define 'during the day' which is an important concept for many analyses. Some studies have used local time — for example 9am to 5pm; others have used thresholds on photosynthetic active radiation (PAR). A related question is how to derive quantities such as the Bowen ratio. Most studies compute the ratio of the averages of the latent heat (LE) and sensible heat (H). In this study, we use different methods of defining 'during the day' for GPP, LE, and H. We evaluate the differences between methods in two ways. First, we look at a number of statistics of GPP. Second, we look at differences in the derived Bowen ratio. Our goal is not science per se, but rather informatics in support of the science.

  5. Computation of Large Covariance Matrices by SAMMY on Graphical Processing Units and Multicore CPUs

    SciTech Connect (OSTI)

    Arbanas, Goran [ORNL; Dunn, Michael E [ORNL; Wiarda, Dorothea [ORNL

    2011-01-01

    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.

  6. Covariance statistics of turbulence velocity components for wind-energy-conversion system design-homogeneous, isotropic case

    SciTech Connect (OSTI)

    Fichtl, G.H.

    1983-09-01

    When designing a wind energy converison system (WECS), it may be necessary to take into account the distribution of wind across the disc of rotation. The specific engineering applications include structural strength, fatigue, and control. This wind distribution consists of two parts, namely that associated with the mean wind profile and that associated with the turbulence velocity fluctuation field. The work reported herein is aimed at the latter, namely the distribution of turbulence velocity fluctuations across the WECS disk of rotation. A theory is developed for the two-time covariance matrix for turbulence velocity vector components for wind energy conversion system (WECS) design. The theory is developed for homogeneous and iotropic turbulance with the assumption that Taylor's hypothesis is valid. The Eulerian turbulence velocity vector field is expanded about the hub of the WECS. Formulae are developed for the turbulence velocity vector component covariance matrix following the WECS blade elements. It is shown that upon specification of the turbulence energy spectrum function and the WECS rotation rate, the two-point, two-time covariance matrix of the turbulent flow relative to the WECS bladed elements is determined. This covariance matrix is represented as the sum of nonstationary and stationary contributions. Generalized power spectral methods are used to obtain two-point, double frequency power spectral density functions for the turbulent flow following the blade elements. The Dryden turbulence model is used to demonstrate the theory. A discussion of linear system response analysis is provided to show how the double frequency turbulence spectra might be used to calculate response spectra of a WECS to turbulent flow. Finally the spectrum of the component of turbulence normal to the WECS disc of rotation, following the blade elements, is compared with experimental results.

  7. Methods and Issues for the Combined Use of Integral Experiments and Covariance Data: Results of a NEA International Collaborative Study

    SciTech Connect (OSTI)

    Giuseppe Palmiotti; Massimo Salvatores

    2014-04-01

    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.

  8. Interpreting Dirac variables in terms of the Hilbert space of gauge-invariant and Poincare-covariant states

    E-Print Network [OSTI]

    L. D Lantsman

    2012-05-01

    The goal of this note is to give a description of Dirac variables in Abelian as well as non-Abelian gauge models in terms of gauge-invariant and Poincare-covariant states sweeping a Hilbert space ${\\cal H}_{\\rm vac}$. The next our conjecture concerns the spontaneous breakdown of the Abelian U(1) symmetry in the 'discrete' $U(1)\\to {\\bf Z}$ wise. We suppose that gauge charges are preserved in this case.

  9. Energy-dependent Lorentz covariant parameterization of the NN interaction between 50 and 200 MeV

    E-Print Network [OSTI]

    Z. P. Li; G. C. Hillhouse; J. Meng

    2007-12-03

    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.

  10. A-Priori and A-Posteriori Covariance Data in Nuclear Cross Section Adjustments: Issues and Challenges

    SciTech Connect (OSTI)

    Palmiotti, Giuseppe; Salvatores, Massimo; Aliberti, G.

    2015-01-01

    In order to provide useful feedback to evaluators a set of criteria are established for assessing the robustness and reliability of the cross section adjustments that make use of integral experiment information. Criteria are also provided for accepting the “a posteriori” cross sections, both as new “nominal” values and as “trends”. Some indications of the use of the “a posteriori” covariance matrix are indicated, even though more investigation is needed to settle this complex subject.

  11. The covariant description of electric and magnetic field lines of null fields: application to Hopf-Ranada solutions

    E-Print Network [OSTI]

    S. J. van Enk

    2013-03-25

    The concept of electric and magnetic field lines is intrinsically non-relativistic. Nonetheless, for certain types of fields satisfying certain geometric properties, field lines can be defined covariantly. More precisely, two Lorentz-invariant 2D surfaces in spacetime can be defined such that magnetic and electric field lines are determined, for any observer, by the intersection of those surfaces with spacelike hyperplanes. An instance of this type of field is constituted by the so-called Hopf-Ranada solutions of the source-free Maxwell equations, which have been studied because of their interesting topological properties, namely, linkage of their field lines. In order to describe both geometric and topological properties in a succinct manner, we employ the tools of Geometric Algebra (aka Clifford Algebra) and use the Clebsch representation for the vector potential as well as the Euler representation for both magnetic and electric fields. This description is easily made covariant, thus allowing us to define electric and magnetic field lines covariantly in a compact geometric language. The definitions of field lines can be phrased in terms of 2D surfaces in space. We display those surfaces in different reference frames, showing how those surfaces change under Lorentz transformations while keeping their topological properties. As a byproduct we also obtain relations between optical helicity, optical chirality and generalizations thereof, and their conservation laws.

  12. Covariants,joint invariants and the problem of equivalence in the invariant theory of Killing tensors defined in pseudo-Riemannian spaces of constant curvature

    E-Print Network [OSTI]

    Roman G. Smirnov; Jin Yue

    2004-08-03

    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.

  13. Properties of nuclei in the nobelium region studied within the covariant, Skyrme, and Gogny energy density functionals

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Dobaczewski, J.; Afanasjev, A. V.; Bender, M.; Robledo, L. M.; Shi, Yue

    2015-07-29

    In this study, we calculate properties of the ground and excited states of nuclei in the nobelium region for proton and neutron numbers of 92 ? Z ? 104 and 144 ? N ? 156, respectively. We use three different energy-density-functional (EDF) approaches, based on covariant, Skyrme, and Gogny functionals, each with two different parameter sets. A comparative analysis of the results obtained for quasiparticle spectra, odd–even and two-particle mass staggering, 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 themore »EDF modelling.« less

  14. The Dirac equation as one fourth-order equation for one function -- a general, manifestly covariant form

    E-Print Network [OSTI]

    Andrey Akhmeteli

    2015-07-13

    Previously (A. Akhmeteli, J. Math. Phys., v. 52, p. 082303 (2011)), the Dirac equation in an arbitrary electromagnetic field was shown to be generally equivalent to a fourth-order equation for just one component of the four-component Dirac spinor function. This was done for a specific (chiral) representation of gamma-matrices and for a specific component. In the current work, the result is generalized for a general representation of gamma-matrices and a general component (satisfying some conditions). The resulting equivalent of the Dirac equation is also manifestly relativistically covariant and should be useful in applications of the Dirac equation.

  15. Low energy analysis of $?N$ scattering and the pion-nucleon sigma term with covariant baryon chiral perturbation theory

    E-Print Network [OSTI]

    J. M. Alarcón; J. Martin Camalich; J. A. Oller

    2013-01-21

    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.

  16. Searching for 4$?$ linear-chain structure in excited states of $^{16}$O with a covariant density functional theory

    E-Print Network [OSTI]

    J. M. Yao; N. Itagaki; J. Meng

    2014-09-19

    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.

  17. Potential energy surfaces of actinide and transfermium nuclei from multi-dimensional constraint covariant density functional theories

    E-Print Network [OSTI]

    Bing-Nan Lu; Jie Zhao; En-Guang Zhao; Shan-Gui Zhou

    2013-03-04

    Multi-dimensional constrained covariant density functional theories were developed recently. In these theories, all shape degrees of freedom \\beta_{\\lambda\\mu} deformations with even \\mu are allowed, e.g., \\beta_{20}, \\beta_{22}, \\beta_{30}, \\beta_{32}, \\beta_{40}, \\beta_{42}, \\beta_{44}, and so on and the CDFT functional can be one of the following four forms: the meson exchange or point-coupling nucleon interactions combined with the non-linear or density-dependent couplings. In this contribution, some applications of these theories are presented. The potential energy surfaces of actinide nuclei in the (\\beta_{20}, \\beta_{22}, \\beta_{30}) deformation space are investigated. It is found that besides the octupole deformation, the triaxiality also plays an important role upon the second fission barriers. The non-axial reflection-asymmetric \\beta_{32} shape in some transfermium nuclei with N = 150, namely 246Cm, 248Cf, 250Fm, and 252No are studied.

  18. Restoration of four-dimensional diffeomorphism covariance in canonical general relativity: An intrinsic Hamilton-Jacobi approach

    E-Print Network [OSTI]

    Salisbury, Donald; Sundermeyer, Kurt

    2015-01-01

    Classical background independence is reflected in Lagrangian general relativity through covariance under the full diffeomorphism group. We show how this independence can be maintained in a Hamilton-Jacobi approach that does not accord special privilege to any geometric structure. Intrinsic spacetime curvature based coordinates grant equal status to all geometric backgrounds. They play an essential role as a starting point for inequivalent semi-classical quantizations. The scheme calls into question Wheeler's geometrodynamical approach and the associated Wheeler-DeWitt equation in which three-metrics are featured geometrical objects. The formalism deals with variables that are manifestly invariant under the full diffeomorphism group. Yet, perhaps paradoxically, the liberty in selecting intrinsic coordinates is precisely as broad as is the original diffeomorphism freedom. We show how various ideas from the past five decades concerning the true degrees of freedom of general relativity can be interpreted in light...

  19. Semi-microscopic modeling of heavy-ion fusion reactions with multi-reference covariant density functional theory

    E-Print Network [OSTI]

    K. Hagino; J. M. Yao

    2015-04-15

    We describe low-lying collective excitations of atomic nuclei with the multi-reference covariant density functional theory, and combine them with coupled-channels calculations for heavy-ion fusion reactions at energies around the Coulomb barrier. To this end, we use the calculated transition strengths among several collective states as inputs to the coupled-channels calculations. This approach provides a natural way to describe anharmonic multi-phonon excitations as well as a deviation of rotational excitations from a simple rigid rotor. We apply this method to subbarrier fusion reactions of $^{58}$Ni+$^{58}$Ni, $^{58}$Ni+$^{60}$Ni and $^{40}$Ca+$^{58}$Ni systems. We find that the effect of anharmonicity tends to smear the fusion barrier distributions, better reproducing the experimental data compared to the calculations in the harmonic oscillator limit.

  20. Charge-conjugation symmetric complete impulse approximation for the pion electromagnetic form factor in the covariant spectator theory

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Biernat, Elmar P.; Gross, Franz; Peña, M. T.; Stadler, Alfred

    2015-10-26

    The pion form factor is calculated in the framework of the charge-conjugation invariant covariant spectator theory. This formalism is established in Minkowski space, and the calculation is set up in momentum space. In a previous calculation we included only the leading pole coming from the spectator quark (referred to as the relativistic impulse approximation). In this study we also include the contributions from the poles of the quark which interacts with the photon and average over all poles in both the upper and lower half-planes in order to preserve charge conjugation invariance (referred to as the C-symmetric complete impulse approximation).more »We find that for small pion mass these contributions are significant at all values of the four-momentum transfer Q2 but, surprisingly, do not alter the shape obtained from the spectator poles alone.« less

  1. Homogeneity of the Genetic Variance-Covariance Matrix for Antipredator Traits in Two Natural Populations of the Garter Snake Thamnophis ordinoides

    E-Print Network [OSTI]

    Brodie III, Edmund D.

    Homogeneity of the Genetic Variance-Covariance Matrix for Antipredator Traits in Two Natural's Terms and Conditions of Use, available at http://www.jstor.org/page/info/about/policies/terms.jsp. JSTOR the discovery and use of these resources. For more information about JSTOR, please contact support

  2. ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data

    SciTech Connect (OSTI)

    G. Palmiotti

    2011-12-01

    The ENDF/B-VII.1 library is our latest recommended evaluated nuclear data file for use in nuclear science and technology applications, and incorporates advances made in the five years since the release of ENDF/B-VII.0. These advances focus on neutron cross sections, covariances, fission product yields and decay data, and represent work by the US Cross Section Evaluation Working Group (CSEWG) in nuclear data evaluation that utilizes developments in nuclear theory, modeling, simulation, and experiment. The principal advances in the new library are: (1) An increase in the breadth of neutron reaction cross section coverage, extending from 393 nuclides to 418 nuclides; (2) Covariance uncertainty data for 185 of the most important nuclides, as documented in companion papers in this edition; (3) R-matrix analyses of neutron reactions on light nuclei, including isotopes of He, Li, and Be; (4) Resonance parameter analyses at lower energies and statistical high energy reactions at higher energies for isotopes of F, Cl, K, Ti, V, Mn, Cr, Ni, Zr and W; (5) Modifications to thermal neutron reactions on fission products (isotopes of Mo, Tc, Rh, Ag, Cs, Nd, Sm, Eu) and neutron absorber materials (Cd, Gd); (6) Improved minor actinide evaluations for isotopes of U, Np, Pu, and Am (we are not making changes to the major actinides 235,238U and 239Pu at this point, except for delayed neutron data, and instead we intend to update them after a further period of research in experiment and theory), and our adoption of JENDL-4.0 evaluations for isotopes of Cm, Bk, Cf, Es, Fm, and some other minor actinides; (7) Fission energy release evaluations; (8) Fission product yield advances for fission-spectrum neutrons and 14 MeV neutrons incident on 239Pu; and (9) A new Decay Data sublibrary. Integral validation testing of the ENDF/B-VII.1 library is provided for a variety of quantities: For nuclear criticality, the VII.1 library maintains the generally-good performance seen for VII.0 for a wide range of MCNP simulations of criticality benchmarks, with improved performance coming from new structural material evaluations, especially for Ti, Mn, Cr, Zr and W. For Be we see some improvements although the fast assembly data appear to be mutually inconsistent. Actinide cross section updates are also assessed through comparisons of fission and capture reaction rate measurements in critical assemblies and fast reactors. We describe the cross section evaluations that have been updated for ENDF/B-VII.1 and the measured data and calculations that motivated the changes, and therefore this paper augments the ENDF/B-VII.0 publication [1].

  3. Physical wavelets: Lorentz covariant, singularity-free, finite energy, zero action, localized solutions to the wave equation

    E-Print Network [OSTI]

    Matt Visser

    2003-04-09

    Particle physics has for some time made extensive use of extended field configuations such as solitons, instantons, and sphalerons. However, no direct use has yet been made of the quite extensive literature on ``localized wave'' configurations developed by the engineering, optics, and mathematics communities. In this article I will exhibit a particularly simple ``physical wavelet'' -- it is a Lorentz covariant classical field configuration that lives in physical Minkowski space. The field is everwhere finite and nonsingular, and has quadratic falloff in both space and time. The total energy is finite, the total action is zero, and the field configuration solves the wave equation. These physical wavelets can be constructed for both complex and real scalar fields, and can be extended to the Maxwell and Yang-Mills fields in a straightforward manner. Since these wavelets are finite energy, they are guaranteed to be classically present at finite temperature; since they are zero action, they can contribute to the quantum mechanical path integral at zero ``cost''.

  4. Assessing net ecosystem carbon exchange of U S terrestrial ecosystems by integrating eddy covariance flux measurements and satellite observations

    SciTech Connect (OSTI)

    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)

    2011-01-01

    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.

  5. Restoration of four-dimensional diffeomorphism covariance in canonical general relativity: An intrinsic Hamilton-Jacobi approach

    E-Print Network [OSTI]

    Donald Salisbury; Jürgen Renn; Kurt Sundermeyer

    2015-08-06

    Classical background independence is reflected in Lagrangian general relativity through covariance under the full diffeomorphism group. We show how this independence can be maintained in a Hamilton-Jacobi approach that does not accord special privilege to any geometric structure. Intrinsic spacetime curvature based coordinates grant equal status to all geometric backgrounds. They play an essential role as a starting point for inequivalent semi-classical quantizations. The scheme calls into question Wheeler's geometrodynamical approach and the associated Wheeler-DeWitt equation in which three-metrics are featured geometrical objects. The formalism deals with variables that are manifestly invariant under the full diffeomorphism group. Yet, perhaps paradoxically, the liberty in selecting intrinsic coordinates is precisely as broad as is the original diffeomorphism freedom. We show how various ideas from the past five decades concerning the true degrees of freedom of general relativity can be interpreted in light of this new constrained Hamiltonian description. In particular, we show how the Kucha\\v{r} multi-fingered time approach can be understood as a means of introducing full four-dimensional diffeomorphism invariants. Every choice of new phase space variables yields new Einstein-Hamilton-Jacobi constraining relations, and corresponding intrinsic Schr\\"odinger equations. We show how to implement this freedom by canonical transformation of the intrinsic Hamiltonian.

  6. Evaluation of the ²³?Pu prompt fission neutron spectrum induced by neutrons of 500 keV and associated covariances

    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.

    2015-08-01

    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

  7. UV matters in shoaling decisions Ricarda Modarressie*, Ingolf P. Rick and Theo C. M. Bakker

    E-Print Network [OSTI]

    (K) filters used, control experiments with neutral-density optical filters were performed in order to clarify environment, suggesting a potential trade-off between UV radiation and lower brightness during shoal choice to the human eye is not necess- arily equivalent to what animals can perceive, because visual systems can

  8. A Real-Time Capable Many-Core Model Stefan Metzlaff, Jorg Mische, Theo Ungerer

    E-Print Network [OSTI]

    Ungerer, Theo

    of Computer Science University of Augsburg Augsburg, Germany {metzlaff architectures. We think that the usage of processors with high core numbers will also emerge in embedded real for embedded real-time systems: predictability, performance and energy efficiency. At first we enunciate a set

  9. A Generic Timing Model for Cyber-Physical Florian Kluge, Mike Gerdes, Florian Haas, Theo Ungerer

    E-Print Network [OSTI]

    Ungerer, Theo

    , for example, the crank shaft in a combustion engine. Certain angu- larities of the crank shaft raise of the crank shaft and changes over time. Specialised real-time task models, e.g. [5,6], are able to map

  10. SecSens -Security Architecture for Wireless Sensor Networks Faruk Bagci, Theo Ungerer

    E-Print Network [OSTI]

    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

  11. Observation of multiple ionization pathways for OCS in an intense laser field resolved by three-dimensional covariance mapping and visualized by hierarchical ionization topology

    E-Print Network [OSTI]

    Bryan, W A; Newell, W R; Sanderson, J H

    2006-01-01

    The two- and three-body Coulomb explosion of carbonyl sulfide (OCS) by 790 nm, 50 fs laser pulses focussed to $\\approx $ 10$^{16}$ Wcm$^{-2}$ has been investigated by three-dimensional covariance mapping technique. For the first time in a triatomic molecule, a single charge state, in this case the trication, has been observed to dissociate into two distinct energy channels. With the aid of a three dimensional visualization technique to reveal the ionization hierarchy, evidence is presented for the existence of two sets of ionization pathways resulting from these two initial states. While one group of ions can be modeled using a Classical enhanced ionization model, the second group, consisting of mainly asymmetric channels, can not. The results provide clear evidence that an enhanced ionization approach must also be accompanied by an appreciation of the effects of excited ionic states and multi-electronic processes.

  12. Observation of multiple ionization pathways for OCS in an intense laser field resolved by three-dimensional covariance mapping and visualized by hierarchical ionization topology

    E-Print Network [OSTI]

    W. A. Bryan; W. R. Newell; J. H. Sanderson; A. J. Langley

    2006-10-10

    The two- and three-body Coulomb explosion of carbonyl sulfide (OCS) by 790 nm, 50 fs laser pulses focussed to $\\approx $ 10$^{16}$ Wcm$^{-2}$ has been investigated by three-dimensional covariance mapping technique. For the first time in a triatomic molecule, a single charge state, in this case the trication, has been observed to dissociate into two distinct energy channels. With the aid of a three dimensional visualization technique to reveal the ionization hierarchy, evidence is presented for the existence of two sets of ionization pathways resulting from these two initial states. While one group of ions can be modeled using a Classical enhanced ionization model, the second group, consisting of mainly asymmetric channels, can not. The results provide clear evidence that an enhanced ionization approach must also be accompanied by an appreciation of the effects of excited ionic states and multi-electronic processes.

  13. Observation of multiple ionization pathways for OCS in an intense laser field resolved by three-dimensional covariance mapping and visualized by hierarchical ionization topology

    SciTech Connect (OSTI)

    Bryan, W. A.; Newell, W. R.; Sanderson, J. H.; Langley, A. J. [Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom); Department of Physics, University of Waterloo, Waterloo, Ontario, N2L 3G1 (Canada); Central Laser Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX (United Kingdom)

    2006-11-15

    The two- and three-body Coulomb explosion of carbonyl sulfide (OCS) by 790 nm, 50 fs laser pulses focused to {approx_equal}10{sup 16} W cm{sup -2} has been investigated by the three-dimensional covariance mapping technique. In a triatomic molecule, a single charge state, in this case the trication, has been observed to dissociate into two distinct energy channels. With the aid of a three-dimensional visualization technique to reveal the ionization hierarchy, evidence is presented for the existence of two sets of ionization pathways resulting from these two initial states. While one group of ions can be modeled using a classical enhanced ionization model, the second group, consisting of mainly asymmetric channels, cannot. The results provide clear evidence that an enhanced ionization approach must also be accompanied by an appreciation of the effects of excited ionic states and multielectronic processes.

  14. Systematic study of nuclear matrix elements in neutrinoless double-beta decay with a beyond mean-field covariant density functional theory

    E-Print Network [OSTI]

    J. M. Yao; L. S. Song; K. Hagino; P. Ring; J. Meng

    2015-01-29

    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.

  15. Microscopic study of low-lying spectra of $\\Lambda$ hypernuclei based on a beyond-mean-field approach with covariant energy density functional

    E-Print Network [OSTI]

    Mei, H; Yao, J M; Motoba, T

    2015-01-01

    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...

  16. Optimal basis set for ab-initio calculations of energy levels in tunneling structures, using the covariance matrix of the wave functions

    E-Print Network [OSTI]

    Sever Spanulescu

    2009-12-15

    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.

  17. Covariance mapping of two-photon double core hole states in C 2 H 2 and C 2 H 6 produced by an x-ray free electron laser

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Mucke, M; Zhaunerchyk, V; Frasinski, L J; Squibb, R J; Siano, M; Eland, J H D; Linusson, P; Salén, P; Meulen, P v d; Thomas, R D; et al

    2015-07-01

    Few-photon ionization and relaxation processes in acetylene (C2H2) and ethane (C2H6) were investigated at the linac coherent light source x-ray free electron laser (FEL) at SLAC, Stanford using a highly efficient multi-particle correlation spectroscopy technique based on a magnetic bottle. The analysis method of covariance mapping has been applied and enhanced, allowing us to identify electron pairs associated with double core hole (DCH) production and competing multiple ionization processes including Auger decay sequences. The experimental technique and the analysis procedure are discussed in the light of earlier investigations of DCH studies carried out at the same FEL and at thirdmore »generation synchrotron radiation sources. In particular, we demonstrate the capability of the covariance mapping technique to disentangle the formation of molecular DCH states which is barely feasible with conventional electron spectroscopy methods.« less

  18. Six-week time series of eddy covariance CO2 flux at Mammoth Mountain, California: performance evaluation and role of meteorological forcing

    SciTech Connect (OSTI)

    Lewicki, Jennifer; Lewicki, J.L.; Fischer, M.L.; Hilley, G.E.

    2007-10-15

    CO{sub 2} and heat fluxes were measured over a six-week period (09/08/2006 to 10/24/2006) by the eddy covariance (EC) technique at the Horseshoe Lake tree kill (HLTK), Mammoth Mountain, CA, a site with complex terrain and high, spatially heterogeneous CO{sub 2} emission rates. EC CO{sub 2} fluxes ranged from 218 to 3500 g m{sup -2} d{sup -1} (mean = 1346 g m{sup -2} d{sup -1}). Using footprint modeling, EC CO{sub 2} fluxes were compared to CO{sub 2} fluxes measured by the chamber method on a grid repeatedly over a 10-day period. Half-hour EC CO{sub 2} fluxes were moderately correlated (R{sup 2} = 0.42) with chamber fluxes, whereas average-daily EC CO{sub 2} fluxes were well correlated (R{sup 2} = 0.70) with chamber measurements. Average daily EC CO{sub 2} fluxes were correlated with both average daily wind speed and atmospheric pressure; relationships were similar to those observed between chamber CO{sub 2} fluxes and the atmospheric parameters over a comparable time period. Energy balance closure was assessed by statistical regression of EC energy fluxes (sensible and latent heat) against available energy (net radiation, less soil heat flux). While incomplete (R{sup 2} = 0.77 for 1:1 line), the degree of energy balance closure fell within the range observed in many investigations conducted in contrasting ecosystems and climates. Results indicate that despite complexities presented by the HLTK, EC can be reliably used to monitor background variations in volcanic CO{sub 2} fluxes associated with meteorological forcing, and presumably changes related to deeply derived processes such as volcanic activity.

  19. Microscopic study of low-lying spectra of $?$ hypernuclei based on a beyond-mean-field approach with covariant energy density functional

    E-Print Network [OSTI]

    H. Mei; K. Hagino; J. M. Yao; T. Motoba

    2015-04-20

    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 hypernuclei. Our study indicates that the energy splitting between the first 1/2$^-$ and 3/2$^-$ hypernuclear states is generally small for all the hypernuclei which we study. However, their configurations depend much on the properties of a core nucleus, in particular on the sign of deformation parameter. That is, the first $1/2^-$ and $3/2^-$ states in $^{13}_{~\\Lambda}$C are dominated by a single configuration with $\\Lambda$ particle in the $p$-wave orbits and thus providing good candidates for a study of the $\\Lambda$ spin-orbit splitting. On the other hand, those states in the other hypernuclei exhibit a large configuration mixing and thus their energy difference cannot be interpreted as the spin-orbit splitting for the $p$-orbits.

  20. Extremal covariant measurements Giulio Chiribellaa

    E-Print Network [OSTI]

    D'Ariano, Giacomo Mauro

    of Physics. DOI: 10.1063/1.2349481 I. INTRODUCTION A fundamental issue in the theory of quantum information1 and for the rank of POVM elements. Two relevant appli- cations are considered, concerning state discrimination with mutually unbiased bases and the maximization of the mutual information. © 2006 American Institute

  1. Covariance propagation in spectral indices

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Griffin, P. J.

    2015-01-09

    The dosimetry community has a history of using spectral indices to support neutron spectrum characterization and cross section validation efforts. An important aspect to this type of analysis is the proper consideration of the contribution of the spectrum uncertainty to the total uncertainty in calculated spectral indices (SIs). This study identifies deficiencies in the traditional treatment of the SI uncertainty, provides simple bounds to the spectral component in the SI uncertainty estimates, verifies that these estimates are reflected in actual applications, details a methodology that rigorously captures the spectral contribution to the uncertainty in the SI, and provides quantified examplesmore »that demonstrate the importance of the proper treatment the spectral contribution to the uncertainty in the SI.« less

  2. Multimodal Approaches for Emotion Recognition: A Survey Nicu Sebea, Ira Cohenb, Theo Geversa, and Thomas S. Huangc

    E-Print Network [OSTI]

    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

  3. The Laboratory of Atomic & Solid State Physics (LASSP) at Cor nell University expects to make a faculty appointment in theo

    E-Print Network [OSTI]

    should submit materials through the Academic Jobs Online web site: h ps://academicjobsonline.org/ajo/jobs for the faculty of Physics, Applied Physics, and Chemistry--including poten al hires in LASSP. #12;DiversityPhysicsDepartment.Pleasesendtheapplication, includingacurriculumvitae,apublicationlist,andastatementofteachingandresearch intereststo:https://academicjobsonline.org/ajo/jobs

  4. The Laboratory of Atomic & Solid State Physics (LASSP) at Cor nell University expects to make a faculty appointment in theo

    E-Print Network [OSTI]

    Wang, Z. Jane

    should submit materials through the Academic Jobs Online web site: h ps://academicjobsonline.org/ajo/jobs for the faculty of Physics, Applied Physics, and Chemistry--including poten al hires in LASSP. #12;

  5. Next Location Prediction Within a Smart Office Building Jan Petzold, Faruk Bagci, Wolfgang Trumler, and Theo Ungerer

    E-Print Network [OSTI]

    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

  6. CONSTRUCTION OF COVARIANCE MATRICES WITH A ...

    E-Print Network [OSTI]

    2009-05-28

    corresponding minimizer of the discrepancy function has a specified value. Often construction of such matrices is a first step in Monte Carlo studies of statistical ...

  7. Modeling covariance structure in unbalanced longitudinal data 

    E-Print Network [OSTI]

    Chen, Min

    2009-05-15

    -effects models: average maximum likelihood estimators and Monte Carlo standard deviations from the true model and five scenarios considered in the simulation study. . 55 ix LIST OF FIGURES FIGURE Page 1 Fitted log-innovation variances and generalized... autoregressive pa- rameters for the fixed-effects model with 10% of the cattle data missing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2 Fitted log-innovation variances and generalized autoregressive pa- rameters for the fixed...

  8. Estimating Vision Parameters Given Data with Covariances

    E-Print Network [OSTI]

    Chojnacki, Wojtek

    is a quadratic form in the compound vector [xT , 1]T , (ii) one component of u(x) is equal to 1. An ancillary, determine = 0 satisfying the ancillary equation (if applicable) together with the system of equations). The rank-2 constraint can in turn be expressed as the ancillary constraint if we let () = 1(59 - 68) + 2

  9. Covariant Balance Laws in Continua with Microstructure

    E-Print Network [OSTI]

    Arash Yavari; Jerrold E. Marsden

    2008-11-13

    The purpose of this paper is to extend the Green-Naghdi-Rivlin balance of energy method to continua with microstructure. The key idea is to replace the group of Galilean transformations with the group of diffeomorphisms of the ambient space. A key advantage is that one obtains in a natural way all the needed balance laws on both the macro and micro levels along with two Doyle-Erickson formulas.

  10. Nonstationary Covariance Functions for Spatial Modelling

    E-Print Network [OSTI]

    Paciorek, Chris

    ) (HSK) RNS (xi, xj) = cij P kxi (u)kxj (u)du · Guaranteed positive definite · Gaussian kernels: kxi (u) exp -(u - xi)T -1 i (u - xi) RNS (xi, xj) = cij exp -(xi - xj)T i+j 2 -1 (xi - xj) · f(·) GP(µ, 2 RNS for P , P = 1, 2, . . ., then RNS (xi, xj) = |i| 1 4 |j | 1 4 i+j 2 1 2 R Qij is positive definite for P

  11. Systematically heterogeneous covariance in network gev models

    E-Print Network [OSTI]

    Bierlaire, Michel

    large in certain market seg- ments. The results also suggest that the two heterogeneous models with increasing computational power, but still requires substantial extra computational and memory resources and vector parameters respectively, and F is a transformational function with the properties that F (-) = 0

  12. $O(d,d)$-Covariant String Cosmology

    E-Print Network [OSTI]

    M. Gasperini; G. Veneziano

    1991-12-17

    The recently discovered $O(d,d)$ symmetry of the space of slowly varying cosmological string vacua in $d+1$ dimensions is shown to be preserved in the presence of bulk string matter. The existence of $O(d,d)$ conserved currents allows all the equations of string cosmology to be reduced to first-order differential equations. The perfect-fluid approximation is not $O(d,d)$-invariant, implying that stringy fluids possess in general a non-vanishing viscosity.

  13. Density-dependent covariant energy density functionals

    SciTech Connect (OSTI)

    Lalazissis, G. A.

    2012-10-20

    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.

  14. Movements of Palearctic and Afrotropical bird species during the dry season (NovemberFebruary) within Nigeria

    E-Print Network [OSTI]

    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

  15. Title: "Effect of Head Posture on the Healthy Human Carotid Bifurcation Hemodynamics"

    E-Print Network [OSTI]

    Papaharilaou, Yannis

    carotid artery (ICA) angles and, in most cases, on cross sectional area ratios for common, internal 25002474, Fax: +357 25002637, email: n.aristokleous@cut.ac.cy 1 Institute of Applied and Computational of Mathematics and Statistics, University of Cyprus, University House "Anastasios G. Leventis", P.O. Box 20537

  16. SST spatial anisotropic covariances from METOP-AVHRR data

    E-Print Network [OSTI]

    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

  17. and the eddy-covariance system and meteorological station were

    E-Print Network [OSTI]

    (GPP, NPP) and net ecosystem production (NEP), and iii) parameterizing/ validating ecosystem process area (Nouvellon et al., 2009) have been studied at these sites. At Kissoko, NEP has been assessed

  18. Covariant spectator theory of np scattering: Deuteron quadrupole moment

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Gross, Franz

    2015-01-26

    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 »XEFT predictions to order N3LO.« less

  19. Covariant Spectator Theory of np scattering: Deuteron Quadrupole Moment

    SciTech Connect (OSTI)

    Gross, Franz

    2015-01-01

    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.

  20. Parameters’ Covariance in Neutron Time of Flight Analysis – Explicit Formulae

    SciTech Connect (OSTI)

    Odyniec, M.; Blair, J.

    2014-12-01

    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.

  1. Mean and Covariance Structure Analysis of Hierarchical Data

    E-Print Network [OSTI]

    Bengt O. Muthén

    2011-01-01

    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

  2. COMPUTATION OF COVARIANCE MATRICES FOR CONSTRAINED PARAMETER ESTIMATION PROBLEMS

    E-Print Network [OSTI]

    Stanford University

    f1(x) 2 2 s.t. f2(x) = 0, (1.1) where f1(x) is a vector of weighted residuals for a model of the form i = M(xtrue, ti) + i, i = 1, . . . , m1. (1.2) Thus, f1(x) = (1 - M(x, t1))/ ... (m1 - M(x, tm1 ))/ , f1(x) 2 2 := m1 i=1 (i - M(x, ti))2 2 . (1.3) The model M(x, t) R that describes the parameter

  3. ENDF/B-VII.1 and its covariances

    E-Print Network [OSTI]

    Danon, Yaron

    . Light nuclei based on R matrix work at LANL (4He, 6Li, 9Be, 16O) 3. Structural materials: 3.1. New Wednesday, April 27, 2011 #12;ENDF/B-VII.1beta2 (neutron sublibrary) 4 Total number of materials 418 New or revised materials 168 Totally or partially new materials 62 - LANL 10 - LANL/ORNL 8 - ORNL 10 - ORNL

  4. Lorentz Covariant Spin-Grouping of Baryon Resonances

    E-Print Network [OSTI]

    Kirchbach, M

    1999-01-01

    A well pronounced spin--grouping of baryon resonances to O(4) partial waves is found in baryon spectra and shown to be well interpreted in terms of Lorentz group representations of the type (1/2 +l', 1/2 +l')* [(1/2, 0)+(0,1/2)] with l' integer. In this way the relativistic description of finite dimensional resonance towers containing higher-spin states becomes possible. It is further argued that the nucleon excitations into the l'=1 and l'=2 multiplets are chiral phase transitions.

  5. Kalman Filtering with Uncertain Noise Covariances Srikiran Kosanam Dan Simon

    E-Print Network [OSTI]

    Simon, Dan

    the health parameters of an aircraft gas turbine engine. Keywords: Kalman filtering, robust filtering to discrete time systems and applied to aircraft gas turbine engine health estimation. Consider a linear of Electrical Engineering Department of Electrical Engineering Cleveland State University Cleveland State

  6. Conformally covariant boundary correlation functions with a quantum group

    E-Print Network [OSTI]

    Kalle Kytölä; Eveliina Peltola

    2014-10-23

    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.

  7. Magnetic and antimagnetic rotation in covariant density functional theory

    SciTech Connect (OSTI)

    Zhao, P. W.; Liang, H. Z.; Peng, J.; Ring, P.; Zhang, S. Q.; Meng, J.

    2012-10-20

    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.

  8. Ensemble Statistics and Error Covariance of a Rapidly Intensifying Hurricane 

    E-Print Network [OSTI]

    Rigney, Matthew C.

    2010-01-16

    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...

  9. i hc K thut Texas l trng i hc cng c cng nhn trn ton quc chuyn o to cc sinh vin hng u trong bi cnh a vn ha v cnh tranh ton cu. Theo Tp ch Wall Street,

    E-Print Network [OSTI]

    Rock, Chris

    1.500$ TNG CNG 32.884$ Hc cao hc: Hc phí và l phí 14.653$ Chi phí sinh hot 9.750$ Bo him sc khe 1.500$ TNG CNG 24.571$ i hc K thut Texas Vn phòng ng ký nhp hc

  10. Quick Summary of Covariate Data for Lab 05 Here, we only have 2 covariates so summarizing things is fairly simple. There is

    E-Print Network [OSTI]

    Rotella, Jay J.

    )) hist(dat$birth_date) abline(v = mean(dat$birth_date), col = "red", lwd = 2) hist(dat$tail_length) abline(v = mean(dat$tail_length), col = "blue", lwd = 2) Histogram of dat$birth_date dat

  11. Vertex corrections for impurity scattering at a ferromagnetic quantum critical point Enrico Rossi1,* and Dirk K. Morr1,2

    E-Print Network [OSTI]

    Rossi, Enrico

    corrections are strongly suppressed with increasing curvature of the fermionic bands. Moreover, we show how via scanning tunneling spectroscopy STS . A detailed theo- retical knowledge of the scattering

  12. The Foundations of Videogame Authorship

    E-Print Network [OSTI]

    Huber, William Humberto

    Cultures 2002 Conference Proceedings, 191–202. Tampere:Tampere University Press, Kress, Gunther R. , and Theo Vanpresented at the CGDC 2002, Tampere: Tampere University

  13. Trajectories of Human Multi-Joint Arm Movements: Evidence of Joint Level Planning

    E-Print Network [OSTI]

    Flanagan, Randy

    the ma\\;imum-smoothncs% theoF car successfull> descti'be tne ua!ectories of human point-:o-porn: honzonta

  14. AndWellness: An Open Mobile System for Activity and Experience Sampling

    E-Print Network [OSTI]

    2011-01-01

    interaction with mobile devices and services. ACM, New York,position tracking for mobile devices. In Proceedings of theo? for continuous mobile device location. In Proceedings of

  15. Brown Adipose Tissue Quantification in Human Neonates Using Water-Fat Separated MRI

    E-Print Network [OSTI]

    2013-01-01

    Nguyen 2 , Theo G. M. van Erp 1 , Ana Guijarro 3 , FaribaJM, Entringer S, Nguyen A, van Erp TGM, Guijarro A, et al. (

  16. Bernstein-von Mises Theorems for Functionals of Covariance Chao Gao and Harrison H. Zhou

    E-Print Network [OSTI]

    Zhou, Harrison Huibin

    The celebrated Bernstein-von Mises (BvM) theorem [20, 3, 29, 21, 27] justifies Bayesian meth- ods from with frequentist coverage guarantees. Despite the success of BvM results in the classical parametric setting infinite dimensions. The pioneering works of [11] and [13] (see also [17]) showed that generally BvM may

  17. Formation of hypernuclei in high energy reactions within a covariant transport model

    E-Print Network [OSTI]

    T. Gaitanos; H. Lenske; U. Mosel

    2009-04-14

    We investigate the formation of fragments with strangeness degrees of freedom in proton- and heavy-ion-induced reactions at high relativistic energies. The model used is a combination of a dynamical transport model and a statistical approach of fragment formation. We discuss in detail the applicability and limitations of such a hybrid model by comparing data on spectator fragmentation at relativistic $SIS/GSI$-energies. The theoretical results are analyzed in terms of spectator fragmentation with strangeness degrees of freedom such as the production of single-$\\Lambda-{}^{3,4,5}He$ hypernuclei. We provide theoretical estimates on the spectra and on inclusive cross sections of light hypernuclei, which could be helpful for future experiments on hypernuclear physics at the new GSI- and J-PARC-facilities.

  18. First-order quantum-gravitational correction to Friedmannian cosmology from covariant, holomorphic spinfoam cosmology

    E-Print Network [OSTI]

    Christian Röken

    2015-07-01

    The first-order loop quantum gravity correction of the simplest, classical general-relativistic Friedmann Hamiltonian constraint, emerging from a holomorphic spinfoam cosmological model peaked on homogeneous, isotropic geometries, is studied. The quantum Hamiltonian constraint, satisfied by the EPRL transition amplitude between the boundary cosmological coherent states, includes a contribution of the order of the Planck constant $\\hbar$ that also appears in the corresponding semiclassical symplectic model. The analysis of this term gives a quantum-gravitational correction to the classical Friedmann dynamics of the scale factor yielding a small decelerating expansion (small accelerating contraction) of the universe. The robustness of the physical interpretation is established for arbitrary refinements of the boundary graphs. Also, mathematical equivalences between the semiclassical cosmological model and certain classical fluid and scalar field theories are explored.

  19. Predicting New Hampshire Indoor Radon Concentrations from geologic information and other covariates

    E-Print Network [OSTI]

    Apte, M.G.

    2011-01-01

    38961 Predicting New Hampshire Indoor Radon ConcentrationsRadon Potential Assessment of New Hampshire, Geologic Radoncollected in the New Hampshire Radon Survey. Fig. 2. The

  20. Constraints on Covariant Horava-Lifshitz Gravity from frame-dragging experiment

    SciTech Connect (OSTI)

    Radicella, Ninfa; Lambiase, Gaetano; Parisi, Luca; Vilasi, Gaetano E-mail: lambiase@sa.infn.it E-mail: vilasi@sa.infn.it

    2014-12-01

    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.

  1. Covariant energy–momentum and an uncertainty principle for general relativity

    SciTech Connect (OSTI)

    Cooperstock, F.I.; Dupre, M.J.

    2013-12-15

    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. -- Highlights: •We present a totally invariant spacetime energy expression for general relativity incorporating the contribution from gravity. •Demand for the general expression to reduce to the Tolman integral for stationary systems supports the Ricci integral as energy–momentum. •Localized energy via the Ricci integral is consistent with the energy localization hypothesis. •New localized energy supports the Bonnor claim that the Szekeres collapsing dust solutions are energy-conserving. •Suggest the Heisenberg Uncertainty Principle be generalized in terms of spacetime energy–momentum in strong gravity extreme.

  2. State covariances and the matrix completion problem Yongxin Chen, Mihailo R. Jovanovic, and Tryphon T. Georgiou

    E-Print Network [OSTI]

    Jovanovic, Mihailo

    by the University of Minnesota Initiative for Renewable Energy and the Environment under Early Career Award RC-0014, noise statistics. I. INTRODUCTION The motivation for this work stems from the need to explain statistics

  3. Newton-Like Methods for Sparse Inverse Covariance Peder A. Olsen

    E-Print Network [OSTI]

    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

  4. IEEE TRANSACTIONS ON AUDIO, SPEECH AND LANGUAGE PROCESSING 1 Direction of Arrival Based Spatial Covariance

    E-Print Network [OSTI]

    Virtanen, Tuomas

    are with the Department of Signal Pro- cessing, Tampere University of Technology, Tampere, Finland, email: first- name

  5. SPECTRAL COVARIANCE IN PRIOR DISTRIBUTIONS OF NON-NEGATIVE MATRIX FACTORIZATION BASED SPEECH SEPARATION

    E-Print Network [OSTI]

    Virtanen, Tuomas

    SEPARATION Tuomas Virtanen Department of Signal Processing, Tampere University of Technology Korkeakoulunkatu

  6. BOOK REVIEWS 143 attention to covariate-conditioned average and quantile effects, along with as-

    E-Print Network [OSTI]

    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

  7. Analysis of formaldehyde fluxes above a Ponderosa Pine forest measured via eddy-covariance

    E-Print Network [OSTI]

    Digangi, FABCDE

    2011-01-01

    Society. Karl, T.  , Atmospheric Chemistry Division (ACD)Kim, S.  , Atmospheric Chemistry Division (ACD) Turnipseed, A.A.  , Atmospheric Chemistry Division (ACD) Mauldin, 

  8. Heritability, covariation and natural selection on 24 traits of common evening primrose (Oenothera biennis) from

    E-Print Network [OSTI]

    Agrawal, Anurag

    proportion of variation in herbivory (r2 = 0.73). At the same time, selection acted on lifetime biomass, life how functional trait variation influences ecological interactions and adaptation to various envi adaptations to different abiotic environments (Ackerly, 2004; Hemsley & Poole, 2004). Similarly, variation

  9. Renormalization of composite operators in Yang-Mills theories using a general covariant gauge

    SciTech Connect (OSTI)

    Collins, J.C.; Scalise, R.J. (The Pennsylvania State University, Department of Physics, 104 Davey Laboratory, University Park, Pennsylvania 16802 (United States))

    1994-09-15

    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.

  10. Global covariation of carbon turnover times with climate in terrestrial ecosystems

    E-Print Network [OSTI]

    2014-01-01

    cycle in the CMIP5 earth system models. J. Clim. 26, 6801–simulations from CMIP5 Earth system models and comparisonoutputs from ten Earth system models from CMIP5 65 (

  11. A covariant action principle for dissipative fluid dynamics: From formalism to fundamental physics

    E-Print Network [OSTI]

    N. Andersson; G. L. Comer

    2015-05-18

    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.

  12. Dimension Reduction and Covariance Structure for Multivariate Data, Beyond Gaussian Assumption 

    E-Print Network [OSTI]

    Maadooliat, Mehdi

    2012-10-19

    G G G G G G G G G G G G G G G G G G G G G 3.5 4.0 4.5 5.0 5.5 ?0. 2 ?0. 1 0. 0 0. 1 0. 2 After Transformation f(y|?=?0.05531) Residua l G GGG GG G GGG G G G G G G G G GGGGG GGG G G G GG G G G GG... on the multiple- probe information. The so-called Li-Wong Reduced (LWR) model was proposed based on the di erences between PM and MM intensities. Since the MM probes are de- signed originally for measuring the background/nonspeci c intensities, the di erences...

  13. A general purpose program for the analysis of variance and the complete analysis of covariance 

    E-Print Network [OSTI]

    Strange, James Reid

    1967-01-01

    3 ' 3 AB SS= 'ij 3 X . . . /2 - Q X. . . /6 'I 3 j= I X. . . /6 + X. . . /18 I 3 ' 3 (3 3X. . . ? 3X. . . . - 3X. . . + X. . . ) /3 2 I I I I C SS = & X. . /9- X. . /IB k=1 ''k 2 (2X . . ? X. . . ) /2 ~ 3 k=1 etc. for the AC, BC...'+ s+ 1 ? 5"~5' 18 f = k+1? sf ~s N(f)~N 0 ~ n 1 ~ S 1 ~5' no es 11 Box 11: Reset cell count to zero, reset current Qx ce I I to zero. Box 12: Control for end of (factor) run Box 13: Control for going out of range of data block. Box 14...

  14. 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

    2014-03-24

    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.

  15. An eddy covariance mesonet to measure the effect of forest age on landatmosphere exchange

    E-Print Network [OSTI]

    Litvak, Marcy

    , and Landsat images to show that the individual stands have changed over the last 22 years in ways that match from 2001 or 2002 to 2004, with most of the missing data caused by low battery charge or bad signals

  16. Neurobiology of Aging xxx (2006) xxxxxx Structural MRI covariance patterns associated with normal

    E-Print Network [OSTI]

    2006-01-01

    .1) participants were scanned with a 1.5 T MRI machine and assessed with a cognitive battery. Images were spatially 2005 Abstract Structural magnetic resonance imaging (MRI) studies have shown dramatic age magnetic resonance images allow for between- and within-groups comparison of grey and white matter volume

  17. Global covariation of carbon turnover times with climate in terrestrial ecosystems

    E-Print Network [OSTI]

    2014-01-01

    cycle in the CMIP5 earth system models. J. Clim. 26, 6801–simulations from CMIP5 Earth system models and comparisonand is considered in Earth system models. The largest global

  18. GR USS-TYPE BOUNDS FOR THE COVARIANCE OF TRANSFORMED RANDOM VARIABLES

    E-Print Network [OSTI]

    Colominas, Ignasi

    Construcciones, Punta del Este, Uruguay. E-mail: megozcue@correo.um.edu.uy Luis Fuentes Garc´ia Departamento de M

  19. 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.

  20. Ship-based measurement of air-sea CO 2 exchange by eddy covariance

    E-Print Network [OSTI]

    Miller, Scott D; Marandino, Christa A; Saltzman, Eric S

    2010-01-01

    temperature, water vapor, and pressure fluctuations in thedue to water vapor, temperature, and pressure will affectand water vapor, respectively, and P is pressure [Webb et

  1. An analysis of Texas rainfall data and asymptotic properties of space-time covariance estimators 

    E-Print Network [OSTI]

    Li, Bo

    2009-06-02

    fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Co-Chairs of Committee, Michael Sherman Raymond J. Carroll Committee Members, Bani Mallick Marian Eriksson Head of Department, Simon J. Sheather August 2006 Major Subject... advisors, they are the people that I can always trust and ask for advice for whatever reason. I wish I could have found a better word than ?Thank you? to convey my appreciation for them. I thank Dr. Bani Mallick and Dr. Marian Eriksson for their willingness...

  2. Six-Week Time Series Of Eddy Covariance Co2 Flux At Mammoth Mountain...

    Open Energy Info (EERE)

    energy fluxes (sensible and latent heat) against available energy (net radiation, less soil heat flux). While incomplete (R2 0.77 for 1:1 line), the degree of energy balance...

  3. Implications and mitigation of model mismatch and covariance contamination for hyperspectral chemical agent detection

    E-Print Network [OSTI]

    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 ...

  4. An eddy covariance mesonet to measure the effect of forest age on land-atmosphere exchange

    E-Print Network [OSTI]

    2006-01-01

    that supported the solar panels (10 Sie- mens SR100 100-Wa scaf- folding tower and solar panels. The 2003 site wasfewer batteries and the solar panels were mounted close to

  5. Covariance Localization with the Diffusion-Based Correlation Models MAX YAREMCHUK

    E-Print Network [OSTI]

    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

  6. Ship-based measurement of air-sea CO 2 exchange by eddy covariance

    E-Print Network [OSTI]

    Miller, Scott D; Marandino, Christa A; Saltzman, Eric S

    2010-01-01

    07a) was from Bridgetown, Barbados (13°06 0 N, 59°37 0 W) toFlux Quality Control Knorr-07a Barbados – Iceland Knorr-07bincreasing: Bridgetown, Barbados, to Reykjavik, Iceland (29

  7. Generator coordinate method for hypernuclear spectroscopy with a covariant density functional

    E-Print Network [OSTI]

    H. Mei; K. Hagino; J. M. Yao

    2015-11-10

    We apply the generator coordinate method (GCM) to single-$\\Lambda$ hypernuclei in order to discuss the spectra of hypernuclear low-lying states. To this end, we use the same relativistic point-coupling energy functional both for the mean-field and the beyond-mean-field calculations. This relativistic GCM approach provides a unified description of low-lying states in ordinary nuclei and in hypernuclei, and is thus suitable for studying the $\\Lambda$ impurity effect. We carry out an illustrative calculation for the low-lying spectrum of $^{21}_\\Lambda$Ne, in which the interplay between the hypernuclear collective excitations and the single-particle excitations of the unpaired $\\Lambda$ hyperon is taken into account in a full microscopic manner.

  8. Generator coordinate method for hypernuclear spectroscopy with a covariant density functional

    E-Print Network [OSTI]

    Mei, H; Yao, J M

    2015-01-01

    We apply the generator coordinate method (GCM) to single-$\\Lambda$ hypernuclei in order to discuss the spectra of hypernuclear low-lying states. To this end, we use the same relativistic point-coupling energy functional both for the mean-field and the beyond-mean-field calculations. This relativistic GCM approach provides a unified description of low-lying states in ordinary nuclei and in hypernuclei, and is thus suitable for studying the $\\Lambda$ impurity effect. We carry out an illustrative calculation for the low-lying spectrum of $^{21}_\\Lambda$Ne, in which the interplay between the hypernuclear collective excitations and the single-particle excitations of the unpaired $\\Lambda$ hyperon is taken into account in a full microscopic manner.

  9. Analysis of formaldehyde fluxes above a Ponderosa Pine forest measured via eddy-covariance

    E-Print Network [OSTI]

    Digangi, FABCDE

    2011-01-01

    Analysis of formaldehyde fluxes above a Ponderosa Pine Go To Analysis of formaldehyde fluxes above a Ponderosa 2011: Analysis of formaldehyde fluxes above a Ponderosa 

  10. Estimating the error variance in nonparametric regression by a covariate-matched U-statistic

    E-Print Network [OSTI]

    Wefelmeyer, Wolfgang

    U. M¨uller, Anton Schick, and Wolfgang Wefelmeyer Abstract. For nonparametric regression models@mathematik.uni-siegen.de. 1 #12;2 URSULA U. M¨ULLER, ANTON SCHICK, AND WOLFGANG WEFELMEYER Alternatively, we could use¨uller, Schick and Wefelmeyer (2001) show that, more precisely, Hall and Marron's estimator is stochastically

  11. On the Impossibility of Covariant Nonlocal "hidden" Variables in Quantum Physics

    E-Print Network [OSTI]

    Nicolas Gisin

    2010-02-06

    Local variables can't describe the quantum correlations observed in tests of Bell inequalities. Likewise, we show that nonlocal variables can't describe quantum correlations in a relativistic time-order invariant way.

  12. Vol. 63 (2009) REPORTS ON MATHEMATICAL PHYSICS No. 1 COVARIANT BALANCE LAWS IN CONTINUA WITH MICROSTRUCTURE

    E-Print Network [OSTI]

    Marsden, Jerrold

    2009-01-01

    August 21, 2008) The purpose of this paper is to extend the Green­Naghdi­Rivlin balance of energy method of material particles and a director field manifold. The Green­ Naghdi­Rivlin theorem and its extensions of energy law and its invariance under time-dependent isometries of the ambient space, one obtains

  13. The covariation of Northern Hemisphere summertime CO2 with surface temperature in boreal regions

    E-Print Network [OSTI]

    2013-01-01

    in the Community Earth System Model: evaluation anduncertainties in Earth system models and for diagnosing the

  14. Entropy Production and Equilibrium Conditions of General-Covariant Spin Systems

    E-Print Network [OSTI]

    Wolfgang Muschik; Horst-Heino von Borzeszkowski

    2015-08-07

    In generalizing the special-relativistic one-component version of Eckart's continuum thermodynamics to general-relativistic space-times with Riemannian or post-Riemannian geometry, we consider the entropy production and other themodynamical quantities such as the entropy flux and the Gibbs fundamental equation. We discuss equilibrium conditions in gravitational theories which are based on such geometries. In particular, thermodynamic implications of the non-symmetry of the energy-momentum tensor and the related spin balance equations are investigated, also for the special case of General Relativity.

  15. Continuous reservoir model updating using an ensemble Kalman filter with a streamline-based covariance localization 

    E-Print Network [OSTI]

    Arroyo Negrete, Elkin Rafael

    2007-04-25

    This work presents a new approach that combines the comprehensive capabilities of the ensemble Kalman filter (EnKF) and the flow path information from streamlines to eliminate and/or reduce some of the problems and limitations ...

  16. Covariant Spectator Theory of np scattering: Deuteron magnetic moment and form factors

    SciTech Connect (OSTI)

    Gross, Franz L. [JLAB

    2014-06-01

    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.

  17. Covariant density functional theory with two-phonon coupling in nuclei

    SciTech Connect (OSTI)

    Ring, P.; Litvinova, E.; Tselyaev, V.

    2012-10-20

    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.

  18. Six-Week Time Series Of Eddy Covariance CO2 Flux At Mammoth Mountain,

    Open Energy Info (EERE)

    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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page| Open Energy Information Serbia-Enhancing Capacity forSilicium de Provence SASSinemSissonville, West

  19. Six-Week Time Series Of Eddy Covariance Co2 Flux At Mammoth Mountain,

    Open Energy Info (EERE)

    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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmental Jump to:EA EIS ReportEurope GmbH Jump to:Idaho-Utah |Renovables

  20. B Thng Mi Hoa K C Quan Qun L i Dng v Kh Quyn Quc Gia

    E-Print Network [OSTI]

    , trang thit b, sc neo, s lng tôm ánh bt theo loài, tình trng tôm (còn u/ct u), khu vc và sâu ánh bt, và theo ch nh ca SRD. Ngoài ra, ch s hu hoc ngi iu hành ó phi cung cp thông tin v kích thc và s lng li rà

  1. Liquidity Creates Money and Debt: An Intertemporal Linear Trading Post Model

    E-Print Network [OSTI]

    Starr, Ross M.

    2014-01-01

    Intertemporal Linear Trading Post Model Tobin, J. (1980), ”of money. Hahn (1982) poses the problem for price theory inthat the existence of money poses to the theo- rist is this:

  2. Causes of International Conflict

    E-Print Network [OSTI]

    Tantiyavarong, Tahned

    2013-01-01

    the connection between power cycle theo- ry and the declineEmpire. According to power cycle theory, states move throughor vice versa. In turn, power cycle theory states that it is

  3. Karush, Matthew B. Culture of Class: Radio and Cinema in the Making of a Divided Argentina, 1920- 1946.

    E-Print Network [OSTI]

    Ospina León, Juan Sebastián

    2013-01-01

    style analysis, Culture of Class carries the disclaimer thatKarush, Matthew B. Culture of Class: Radio and Cinema in theO SPINA L EÓN I n Culture of Class, Matthew B. Karush, an

  4. AVERAGES ALONG POLYNOMIAL SEQUENCES IN DISCRETE NILPOTENT GROUPS: SINGULAR RADON TRANSFORMS

    E-Print Network [OSTI]

    Magyar, Akos

    AVERAGES ALONG POLYNOMIAL SEQUENCES IN DISCRETE NILPOTENT GROUPS: SINGULAR RADON TRANSFORMS can consider discrete maximal Radon transforms, which have applications to pointwise ergodic theo- rems, and discrete singular Radon transforms. In this paper we prove L2 boundedness of discrete

  5. Revista General de Informacin y Documentacin ISSN: 1131-8635 2008, 18 375-380

    E-Print Network [OSTI]

    Theune, Mariët

    Revista General de Información y Documentación ISSN: 1131-8635 2008, 18 375-380 Breaking the rules;376 Revista General de Información y Documentación 2008, 18 375-380 Theo Huibers and Bernd Wondergem Breaking

  6. Air-sea gas exchange of CO 2 and DMS in the North Atlantic by eddy covariance

    E-Print Network [OSTI]

    Miller, Scott D; Marandino, Christa A; De Bruyn, Warren; Saltzman, Eric S; McCormick, C.

    2009-01-01

    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

  7. Toward a consistency cross-check of eddy covariance flux–based and biometric estimates of ecosystem carbon balance

    E-Print Network [OSTI]

    2009-01-01

    CO 2 and energy fluxes over a mixed hardwood forest in theand energy fluxes [Baldocchi et al. , 1988]. Forest Ecology

  8. A Lorentz Covariant Holoraumy-Induced "Gadget" From Minimal Off-Shell 4D, N = 1 Supermultiplets

    E-Print Network [OSTI]

    Gates,, S J; Miller-Dickson, M D; Mondal, B A; Oskoui, A; Regmi, S; Ross, E; Shetty, R

    2015-01-01

    Starting from three minimal off-shell 4D, $\\cal N$ = 1 supermultiplets, using constructions solely defined within the confines of the four dimensional field theory we show the existence of a "gadget" - a member of a class of metrics on the representation space of the supermultiplets - whose values directly and completely correspond to the values of a metric defined on the 1d, $N$ = 4 adinkra networks adjacency matrices corresponding to the projections of the four dimensional supermultiplets.

  9. Global patterns of landatmosphere fluxes of carbon dioxide, latent heat, and sensible heat derived from eddy covariance,

    E-Print Network [OSTI]

    Chen, Jiquan

    Global patterns of landatmosphere fluxes of carbon dioxide, latent heat, and sensible heat derived 2011. [1] We upscaled FLUXNET observations of carbon dioxide, water, and energy fluxes to the global (NEE), latent energy (LE), and sensible heat (H) based on remote sensing indices, climate

  10. Robust Statistical Tests for Evaluating the Hypothesis of Close Fit of Misspecified Mean and Covariance Structural Models

    E-Print Network [OSTI]

    Li, Libo; Bentler, Peter

    2006-01-01

    Model Selection. Manuscript. Curran, P. J. , Bollen, K. A. ,316. Bollen, K. A. , & Curran, P. J. (2006). Latent Curveare given by Bollen and Curran (2006), Byrne (2006), Hays,

  11. Robust Statistical Tests for Evaluating the Hypothesis of Close fit of Misspecified Mean and Covariance Structural Models

    E-Print Network [OSTI]

    Li, Libo; Bentler, Peter

    2006-01-01

    Model Selection. Manuscript. Curran, P. J. , Bollen, K. A. ,316. Bollen, K. A. , & Curran, P. J. (2006). Latent Curveare given by Bollen and Curran (2006), Byrne (2006), Hays,

  12. Robust Statistical Tests for Evaluating the Hypothesis of Close Fit of Misspecified Mean and Covariance Structural Models

    E-Print Network [OSTI]

    Libo Li; Peter Bentler

    2011-01-01

    Model Selection. Manuscript. Curran, P. J. , Bollen, K. A. ,316. Bollen, K. A. , & Curran, P. J. (2006). Latent Curveare given by Bollen and Curran (2006), Byrne (2006), Hays,

  13. Formulation d'un modle de covariance d'erreur d'bauche multivari pour l'assimilation

    E-Print Network [OSTI]

    · Directement liées aux variables du modèle · Peu nombreuses · Inégalement réparties en espace et en temps

  14. 614 IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 51, NO. 3, MARCH 2003 Locally Stationary Covariance and Signal Estimation

    E-Print Network [OSTI]

    Mallat, Stéphane

    stationary processes. A macrotile algorithm uses a penalized method to optimize the partition of the space in orthogonal subspaces, and the estimation is computed with a projection operator. It is implemented by searching for a best basis among a dictionary of orthogonal bases and by constructing an adaptive

  15. First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources

    E-Print Network [OSTI]

    2011-01-01

    was sampled using a 1/8” ID PTFE tube. While dry, this airof ?2.5 SLM using a 1/8 ID PTFE tube. Blank experiments were

  16. Deriving a light use efficiency model from eddy covariance flux data for predicting daily gross primary production across biomes

    E-Print Network [OSTI]

    2007-01-01

    such as temperature and vapor pressure, as well as waterPotter et al. , 1993) and vapor pressure deficit (VPD) (moisture index (SM), water vapor pressure deficit (VPD) and

  17. Toward a consistency cross-check of eddy covariance flux–based and biometric estimates of ecosystem carbon balance

    E-Print Network [OSTI]

    2009-01-01

    estimates of annual carbon sequestration in a Sitka spruce (carbon cycling in a temperate forest: Radiocarbon-based estimates of residence times, sequestration

  18. Deriving a light use efficiency model from eddy covariance flux data for predicting daily gross primary production across biomes

    E-Print Network [OSTI]

    2007-01-01

    biome comparison of daily light-use efficiency for grossNPP): analysis of differences in light absorptionand light-use efficiency. Global Change Biol. 5, Ruimy, A. ,

  19. Kalman Filtering with Uncertain Process and Measurement Noise Covariances with Application to State Estimation in Sensor Networks

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    around it. The heterogeneous set of sensors is connected with the computation platform through : Control in most cars and trucks today and has revolutionized the automotive in- dustry, where embedded control has

  20. Toward a consistency cross-check of eddy covariance flux–based and biometric estimates of ecosystem carbon balance

    E-Print Network [OSTI]

    2009-01-01

    of ecosystem carbon balance S. Luyssaert, 1 M. Reichstein, 2controls on the carbon balances of three southern borealCROSS-CHECK FOR CO 2 BALANCES Yi, C. X. , D. E. Anderson, A.

  1. Air-sea gas exchange of CO 2 and DMS in the North Atlantic by eddy covariance

    E-Print Network [OSTI]

    Miller, Scott D; Marandino, Christa A; De Bruyn, Warren; Saltzman, Eric S; McCormick, C.

    2009-01-01

    2007 from Bridgetown, Barbados to Reykjavik, Iceland (Knorr-increasing, Bridgetown, Barbados to Reykjavik, Iceland (29

  2. First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources

    E-Print Network [OSTI]

    2011-01-01

    Stockwell, W. : A study of formaldehyde chemistry above aPhotochemistry of formaldehyde during the 1993 Troposphericand modeling of formaldehyde at the prophet mixed hardwood

  3. Toward a consistency cross-check of eddy covariance flux–based and biometric estimates of ecosystem carbon balance

    E-Print Network [OSTI]

    2009-01-01

    of this figure in the HTML. as GPP – NPP + Rh. Because theof this figure in the HTML. [ 39 ] Ideally the Ra/GPP and

  4. Generally covariant Fresnel equation and the emergence of the light cone structure in linear pre-metric electrodynamics

    E-Print Network [OSTI]

    Guillermo F. Rubilar; Yuri N. Obukhov; Friedrich W. Hehl

    2002-03-25

    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.

  5. Measurements of carbon sequestration by long-term eddy covariance: methods and a critical evaluation of accuracy

    E-Print Network [OSTI]

    Goulden, ML; Munger, JW; Song-Miao, F; Daube, BC; Wofsy, SC

    1996-01-01

    182 Measurements of carbon sequestration by long-term eddyerror. The integrated carbon sequestration in 1994 was 2.1 ton the annual carbon sequestration in 1994 of -0.3 to +0.8 t

  6. Regional Pathways to Technological Upgrading: The Impact of Agglomeration Economies and its Regional Covariates on Upgrading in Post-reforms India's Manufacturing Sector

    E-Print Network [OSTI]

    Mallavarapu, Bravishwar

    2013-01-01

    conducted by the India Ministry of Statistics and Programmeconducted by the India Ministry of Statistics and Programmeof Statistics and Programme Implementation, India. Figure B-

  7. Type I error and power of the mean and covariance structure confirmatory factor analysis for differential item functioning detection: Methodological issues and resolutions

    E-Print Network [OSTI]

    Lee, Jaehoon

    2009-01-01

    or not a given level of measurement equivalence holds, different scaling methods can lead to different conclusions when a researcher locates DIF in a scale. This dissertation evaluates the MACS analysis for DIF detection by means of a Monte Carlo simulation...

  8. Six-week time series of eddy covariance CO2 flux at Mammoth Mountain, California: performance evaluation and role of meteorological forcing

    E-Print Network [OSTI]

    Lewicki, J.L.

    2008-01-01

    2 emission at Mammoth Mountain as a sign of magmatic unrest.emissions at Mammoth Mountain, California. U.S. Geologicalfrom soils of a Mammoth Mountain tree kill: Horseshoe Lake,

  9. Eddy Covariance Fluxes of Nitrogen Oxides at Harvard Forest NOx deposition is important to both the biosphere and the atmosphere: the form of

    E-Print Network [OSTI]

    Current estimates indicate that fossil fuel combustion and soil microbial emissions are the largest by smaller contributions from biomass burning, lightning, ammonia oxidation, the ocean, and the stratosphere. Oxidation of natural and anthropogenic hydrocarbon emissions produces intermediate products

  10. Relation of cognitive reserve and task performance to expression of regional covariance networks in an event-related fMRI study of

    E-Print Network [OSTI]

    with the aging process (Cabeza et al., 1997a,b; Reuter-Lorenz, 2002; Stern et al., 2000) highlighted many age AG 14671. * Corresponding author. 630 West 168th Street, P&S Box 16, New York, NY, 10032. Fax: 1

  11. Regional Pathways to Technological Upgrading: The Impact of Agglomeration Economies and its Regional Covariates on Upgrading in Post-reforms India's Manufacturing Sector

    E-Print Network [OSTI]

    Mallavarapu, Bravishwar

    2013-01-01

    Pradesh West Bengal Bihar Kerala Uttar Pradesh Punjab JammuPradesh West Bengal Bihar Kerala Uttar Pradesh Punjab JammuPradesh Andhra Pradesh Assam Kerala Daman and Diu Jammu and

  12. arXiv:physics/0508124v2[physics.class-ph]2Jan2006 DOI:10.1063/1.2162107 Covariant Irreducible Parametrization of Electromagnetic Fields

    E-Print Network [OSTI]

    California at Berkeley, University of

    intrinsic spin of the electromagnetic field. I. INTRODUCTION The electromagnetic field in Maxwells theory The fundamental physical object describing the electromagnetic field is the electromagnetic field tensor fµ which Parametrization of Electromagnetic Fields in Arbitrary Spacetime David Sundkvist Laboratoire de Physique et Chimie

  13. A Meta-Analysis of Face Recognition Covariates Yui Man Lui, David Bolme, Bruce A. Draper, J. Ross Beveridge, Geoff Givens, P. Jonathon Phillips

    E-Print Network [OSTI]

    Beveridge, Ross

    -analysis [32]. Here we present a quantitative summary of papers in the face recognition literature that report for which multiple studies reported effects on face recognition performance. These are: age of the person algorithms. Finally, given the studies summarized here, no clear conclusions can be drawn about whether one

  14. Eddy Covariance Fluxes of Nitrogen Oxides at Harvard Forest NOx deposition is important to both the biosphere and the atmosphere: the form of

    E-Print Network [OSTI]

    cycling of NO-NO2, and does not contribute to net NOx flux. Net deposition velocity of NOx [Aneja et al., 2001]. NO is rapidly converted to NO2 via reaction with O3 (Reaction 3.1), with typical.2), regenerating O3 by the reaction of O(3 P) with molecular oxygen (R3.3): NO + O3 NO2 + O2 (R3.1) NO2 + h NO + O

  15. Covariation of climate and long-term erosion rates across a steep rainfall gradient on the Hawaiian island of Kaua'i

    E-Print Network [OSTI]

    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 ...

  16. Bulletin of the Seismological Society of America

    E-Print Network [OSTI]

    Archuleta, Ralph

    of energy is evident in both ruptures. The static displacement on the rupture surface overshoots the theo in a prestressed foam rubber block. INTRODUCTION The physical concept of elastic rebound as proposed by Reid (1910) is generally accepted as the mechanism for a tectonic earthquake. The essence of the elastic rebound hypothesis

  17. A model of ideal elastomeric gels for polyelectrolyte gels

    E-Print Network [OSTI]

    Suo, Zhigang

    as smart materials in sensors and actuators.8,9 These applications have motivated the development of theo effect well and that it provides a good description of the free energy associated with the stretching that the presence of cross-links does not affect the mixing energy of the polymer chains and the solvent measurably

  18. CONMOW: Condition Monitoring for Offshore Wind Farms

    E-Print Network [OSTI]

    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

  19. Surface solitons in chirped photonic lattices Mario I. Molina,1,

    E-Print Network [OSTI]

    not require any minimum power to exist provided the chirp parameter exceeds some critical value. We also surface waves has been renewed after the first theo- retical prediction [2] and subsequent experimental solitons in infinite lattices: discrete surface states can only exist above a certain threshold power and

  20. Magnetic fluctuation power near proton temperature anisotropy instability thresholds in the solar wind

    E-Print Network [OSTI]

    California at Berkeley, University of

    Magnetic fluctuation power near proton temperature anisotropy instability thresholds in the solar wind S. D. Bale, J. C. Kasper, G. G. Howes, E. Quataert,§ C. Salem,¶ and D. Sundkvist¶ (Dated: August 10, 2009) The proton temperature anisotropy in the solar wind is known to be constrained by the theo

  1. Potential energy curves for NO+ D. L. Albritton and A. L. Schmeltekopf

    E-Print Network [OSTI]

    ' potential energy curves that are based on the best current experimental and theo- retical knowledgePotential energy curves for NO+ D. L. Albritton and A. L. Schmeltekopf Aeronomy Laboratory. NOAA of the electronic structure of the NO+ ion. Based on these results. new potential energy curves for the electronic

  2. Surface-Based Analysis of Functional Magnetic Resonance Imaging Data

    E-Print Network [OSTI]

    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

  3. Response time distributions and network perturbation into product-form

    E-Print Network [OSTI]

    Imperial College, London

    to deriving corresponding response time distributions. The Reversed Compound Agent Theo- rem (RCAT) is used in both the forward and reversed processes. Therefore if the reversed process is known, each node-sojourn time can be taken from either process. In particular, the reversed process can be used for the first

  4. The degree to which genes and environment determine brain structure and function is of fundamental importance. Large-

    E-Print Network [OSTI]

    Thompson, Paul

    -specific patterns of gene and brain function in large human populations1,2. Yet, little is known about the genetic Thompson1, Tyrone D. Cannon2, Katherine L. Narr1, Theo van Erp2, Veli-Pekka Poutanen3, Matti Huttunen4 Dail1, Chris I. Zoumalan1 and Arthur W. Toga1 1 Laboratory of Neuro Imaging and Brain Mapping Division

  5. Linear analysis of a multibeam cyclotron-resonance maser array M. Korol and E. Jerby

    E-Print Network [OSTI]

    Jerby, Eli

    in the development of novel particle accelerators, fusion reactors, radars, communication systems, and various-resonance maser CRM array is a new concept for compact, high-power CRM devices operating at low voltages. The CRM and theo- retical studies 23­29 show that the PWC has the potential to become a compact low-voltage source

  6. DOI 10.1007/s11548-014-1010-3 ORIGINAL ARTICLE

    E-Print Network [OSTI]

    van Vliet, Lucas J.

    · Anouk van Dijk · Aad van der Lugt · Jacqueline C. Witteman · Wiro J. Niessen · Lucas J. van Vliet · Theo. Selwaness · R. Hameeteman · A. van Dijk · A. van der Lugt · W. J. Niessen · T. van Walsum Department Sciences, Delft University of Technology, Delft, The Netherlands M. Selwaness · A. van Dijk · J. C

  7. EVOLUTION SEMIGROUPS AND ROBUST STABILITY OF EVOLUTION OPERATORS ON BANACH SPACES

    E-Print Network [OSTI]

    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

  8. STUDY OF THE OSCILLATION CONDITION OF QUARTZ OSCILLATORS BY GYRATOR TRANSFORMATION

    E-Print Network [OSTI]

    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

  9. Journal of Automated Reasoning manuscript No. DOI 10.1007/s10817-015-9334-4

    E-Print Network [OSTI]

    Bonacina, Maria Paola

    theo- rem-proving method, which generalizes to first-order logic the Davis-Putnam-Lo- veland in the eyes of all colleagues involved. When Bill McCune unexpectedly passed away, and I had the idea to mathematics, knowing how much Bill cared for that topic. While being already terminally ill, Mark had

  10. The Institute for Critical Technology and Applied Science at Virginia Tech supports and promotes cutting-edge research at the intersection of engineering, science, and medicine. Please visit www.ictas.vt.edu.

    E-Print Network [OSTI]

    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

  11. Rate constants from the reaction path Hamiltonian. I. Reactive flux simulations for dynamically correct rates

    E-Print Network [OSTI]

    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

  12. Reduction of Ion Heating During Magnetic Reconnection by Large-Scale Effective C. C. Haggerty,

    E-Print Network [OSTI]

    Shay, Michael

    Reduction of Ion Heating During Magnetic Reconnection by Large-Scale Effective Potentials C. C heating due to magnetic reconnection is an important process with applications to diverse plasmas, but previous simulations and observations have measured heating less than half of theo- retical predictions

  13. nh gi Tn tht Ti nguyn Thin nhin Trn du Deepwater Horizon D n phc hi C bin ti B Bin Quc Gia

    E-Print Network [OSTI]

    Horizon. Sau s c tràn du Deepwater Horizon, mt lng áng k du t n bãi bin dc theo Florida Panhandle. Trong vi C rùa( Thallasiumtestudium ) , loài ph bin nht ti thm c bin GUIS 3 ) t các im quan trc o lng và

  14. Th hai, 21/05/2012, 16:05:28 GMT+7 RSS Newsletter Qung co ng dy nng t lm trang ch 14/05/2012 12:38

    E-Print Network [OSTI]

    vng d án này, gi là H thng Cm bin ni, có th thay i cách theo dõi cht lng và dòng chy ca nc ti h thng sông SacramentoSan Joaquin. ây cng là h thng sông cung cp khong 2/3 lng nc ngt cho tiu bang California

  15. Xs are for Trajectory Evaluation, Booleans are for Theorem Proving

    E-Print Network [OSTI]

    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

  16. Mathematical| Surveys||

    E-Print Network [OSTI]

    Teschl, Gerald

    . __________________________________________________ Library of Congress Cataloging-in-Publication Data Teschl, Gerald, 1970- Jacobi Operators Weyl-Titchmarsh-Kodaira theory, covering all classical asp* *ects like Weyl m-functions, spectral functions, the moment problem, inverse spectral theo* *ry, and uniqueness results. Next, we investigate

  17. vol. 171, no. 2 the american naturalist february 2008 Factors Affecting the Evolution of Bleaching

    E-Print Network [OSTI]

    Day, Troy

    Caley3,§ 1. Department of Mathematics and Statistics, Queen's University, Kingston, Ontario K7L 3N6 of interspecific co- operation and have been the focus of considerable theo- retical and empirical research. Much, maintenance, and breakdown of mutualistic associations (Hamilton 1970; Frank 1994; Doebeli and Knowlton 1998

  18. LocSens -An Indoor Location Tracking System using Wireless Sensors

    E-Print Network [OSTI]

    Ungerer, Theo

    proved itself for outdoor usage. But it is not suitable for indoor applications due to poor coverage: fbagci@uci.edu F. Kluge is with the Department of Computer Science, University of Augsburg, Germany, University of Augsburg, Germany, email: Theo.Ungerer@informatik.uni-augsburg.de N. Bagherzadeh

  19. Under consideration for publication in J. Fluid Mech. 1 A two species model of aeolian sand

    E-Print Network [OSTI]

    Under consideration for publication in J. Fluid Mech. 1 A two species model of aeolian sand 30 January 2004) The transport of sand by the wind results from the equilibrium between the erosion governing the saturation of the sand flux are investigated theo- retically. We first demonstrate

  20. ESTR -Energy Saving Token Ring Protocol for Wireless Sensor Networks

    E-Print Network [OSTI]

    Ungerer, Theo

    of California, Irvine, USA, Phone: (949) 824-8720, email: nader@uci.edu mode. The energy cost rises enormouslyESTR - Energy Saving Token Ring Protocol for Wireless Sensor Networks Faruk Bagci, Theo Ungerer and Nader Bagherzadeh Abstract--Most wireless sensor networks rely on battery energy. In applications

  1. nh Gi Thit Hi Ti Nguyn Thin Nhin Do S C Trn Du Deepwater Horizon

    E-Print Network [OSTI]

    lên các bãi bin trng bng phng. Vt liu này cng có th nm thành di nh dài hai dm theo ng mc thy triu và di mc thy triu thuc phía Vnh Fort Pickens, thnh thong khách thm cng hay bi li ch này. Các mnh nh nha

  2. Solution of the p(2 2) NiO(111) surface structure using direct methods

    E-Print Network [OSTI]

    Marks, Laurence D.

    -packed layers of oxygen and nickel atoms: the top surface layer is nickel terminated with 3/4 of the nickel/4 of the nickel atoms missing. The structure is consistent with theo- retical predictions of octopolar termination and electronic structure of the proposed reconstruction. Calculated partial atomic charges and magnetic moments

  3. Lidar fluorosensing of mineral oil spills on the sea surface

    E-Print Network [OSTI]

    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

  4. K.-H. Spatschek Associate Editors

    E-Print Network [OSTI]

    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

  5. Semiclassical framework for the calculation of transport anisotropies 

    E-Print Network [OSTI]

    Vyborny, Karel; Kovalev, Alexey A.; Sinova, Jairo; Jungwirth, T.

    2009-01-01

    -known phenomenon1?3 with applications in spintronics.4,5 Although the experimental observation of this anisotropic magnetoresistance ?AMR? is rather direct?first accomplished as early as 1857?its theo- retical understanding is far from being complete. It has...

  6. Architectures for Hard Real-Time

    E-Print Network [OSTI]

    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

  7. Contrib. Plasma Phys. 53, No. 45, 397 405 (2013) / DOI 10.1002/ctpp.201200094 Electron screening effect on stellar thermonuclear fusion

    E-Print Network [OSTI]

    2013-01-01

    effect on stellar thermonuclear fusion Alexander Y. Potekhin1,2 and Gilles Chabrier2,3 1 Ioffe Physical thermonuclear reactions for various stellar objects, namely in the liquid envelopes of neutron stars. In addition, we examine some recent unconventional theo- retical results on stellar thermonuclear fusions

  8. The following are typical equations and conversions for calculating flux densities of sensible, latent and carbon dioxide from eddy covariances presented by Kevin Tu, St. Louis (10/97). The

    E-Print Network [OSTI]

    Tu, Kevin

    'q'] ) If a correction for crosswind effects on the temperature measurement (typically derived from the vertical wind

  9. Co-Variability of Global SeaWiFS-Chlorophyll and AVHRR-SST Maureen A. Kennelly and James A. Yoder, Graduate School of Oceanography, University of Rhode Island

    E-Print Network [OSTI]

    Yoder, James S.

    . · The 1997/1998 El Nino started in May 1997, peaked in November 1997, and ended in April 1998. The transition between El Nino and La Nina occurred between May and June 1998. La Nina started in July 1998, peaked in December 1998, and ended in February 2001. · A weaker El Nino started in May 2002, peaked in November 2002

  10. Determination of alpha_S using hadronic event shape distributions of data taken with the OPAL detector

    E-Print Network [OSTI]

    Schieck, J

    2011-01-01

    The measurement of the strong coupling alpha_S using hadronic event shape distributions measured with the OPAL detector at center-of-mass energies between 91 and 209 GeV is summarized. For this measurement hadronic event shape distributions are compared to theoretical predictions based on next-to-next-to-leading-calculations (NNLO) and NNLO combined with resummed next-to-leading-logarithm calculations (NLLA). The combined result using NNLO calculations is alpha_S(MZ)=0.1201+-0.0008(stat.)+-0.0013(exp.)+-0.0010(had.)+-0.0024(theo.) and the result using NLLO and NLLA calculations is alpha_S(MZ)=0.1189+-0.0008(stat.)+-0.0016(exp.)=-0.0010(had.)+-0.0036(theo.), with both measurements being in agreement with the world average.

  11. Supplemental Material Table 1. Stimuli for in-scanner task. Block Rhyme Task Stimuli

    E-Print Network [OSTI]

    between brain activation and task performance (r = .008 ~ .23, p = .59 ~ .98). 2. Analyses of covariance

  12. A Review of "The Use of Censorship in the Enlightenment" edited by Mogens Laerke 

    E-Print Network [OSTI]

    Blackman, Robert H.

    2011-01-01

    to Spinoza in Germany around 1700,? Manfred Walther argues that an examination of attempts to prevent the spread of Spinoza?s ideas reveals that German intellectuals fought a war on two fronts. While they wished to censor dangerous ideas, they were... reluctant to take actions that narrowed the range of moderate inquiry into theo- logical and scientific matters. Radical ideas were not only dangerous for their content, but also from the way in which religious fanatics could use them to stifle...

  13. Halo Nucleus Be11: A Spectroscopic Study via Neutron Transfer

    E-Print Network [OSTI]

    Schmitt, K. T.; Jones, K. L.; Bey, A.; Ahn, S.; Bardayan, D. W.; Bardayan, D. W.; Blackmon, J. C.; Brown, S. M.; Chae, K. Y.; Chipps, K. A.; Cizewski, J. A.; Hahn, K. I.; Kolata, J. J.; Kozub, R. L.; Liang, J. F.; Matei, C.; Matoš, M.; Matyas, D.; Moazen, B.; Nesaraja, C.; Wilson, Graham Wallace

    2012-05-08

    the final state resembles the ground state of the core coupled to a neutron in a particular single-particle state. This formalism relies on nuclear scattering potentials to describe the interaction between the two nuclei in the entrance and exit channels...), or insufficiently constrained theo- retical analysis. To help resolve this situation, an extensive series of measurements have been made using a primary beam of 10 Be ions. Elastic- and inelastic-scattering data were ob- tained simultaneously with neutron transfer...

  14. Khi phc Sm D tho K hoch Khi phc Sm v nh gi Mi trng Giai on IV N g y 2 0 t h n g 5

    E-Print Network [OSTI]

    on IV có trên www.gulfspillrestoration.noaa. gov và nhiu a im trong cng ng vùng vnh (xem dan sách trên Trc Giai on IV, các y viên ã thông qua ba k hoch khôi phc sm, bao gm tng cng 54 d án trên khp vùng Vnh vi tng chi phí khong 698 triu USD. Các y viên cng ã thông qua mt K Hoch Khôi phc Sm theo quy trình và

  15. Observation of 8 B Solar Neutrinos from 300-day data at Super-Kamiokande

    E-Print Network [OSTI]

    Tokyo, University of

    appreciation goes to my advisor, Prof. Yorikiyo Nagashima. He introduced me to experimental physics and his with the experiments. Particular thanks to Dr.Y.Itow. He helped me to maintain High Voltage power supply system. I owe be compared with the standard solar model prediction(BP95)[9] 6:62 +0:93 01:12 (theo:)[#2;10 6 cm 02 s 01

  16. On some proofs of Muntz-Szasz theorems 

    E-Print Network [OSTI]

    Smith, Lyle Ross

    1970-01-01

    combination of non-negative, integral powers. An obvious question which leads to a generalization of this theorem con- cerns the powers w21ose linear co(nbina=ions form the approximating polynomials. For what restricted systems of powers will this theorem... and completed some considerations omitted by Muntz. Next T. Carleman in his 1923 paper "On the approximation of analytic function by linear aggregates of prescribed powers" f 2] used function theo- retic methods to obtain a further generalization, which...

  17. nh gi Tn hi Ti nguyn Thin nhin do Trn du Deep Horizon Khi phc loi chim ng bin ti vng b bin Alabama

    E-Print Network [OSTI]

    ánh giá Tn hi Tài nguyên Thiên nhiên do Tràn du Deep Horizon Khôi phc loài chim ng bin ti vùng b Alabama s hình thành 5 nn làm t ca chim ng dc theo vùng b bin Mobile và Baldwin, Alabama tng c hi làm có th c tìm thy quanh nm ti khu vc b bin Alabama. Chim ng bin òi hi nhng khu vc làm t rng rãi vi

  18. nh Gi Thit Hi Ti Nguyn Thin Nhin ca V Trn Du Deepwater Horizon Cc D n Khu Vc

    E-Print Network [OSTI]

    Sinh Vnh St. Joseph thuc Qun Gulf, và có th thêm c khu Bo Tn Thy Sinh Cng Alligator thuc Qun Franklin hi ti ba Khu Bo Tn Thy Sinh (Vnh St. Joseph, Cng Alligator, và St. Andrews). Bc tip theo s bao gm vic bin báo mang tính giáo dc và cp các t ri ti các li h tàu ti Vnh St. Joseph, Cng Alligator, and Vnh St

  19. NAVAL POSTGRADUATE SCHOOL MONTEREY, CALIFORNIA

    E-Print Network [OSTI]

    RESEA;l.CH IN MULTISE::.JSOR DATA ?US I ON . II I . THEO::RADIATION- MATTER INTERACTION . RADIATION-MATTER I NTE XACTION I N VIS I BLE WAV8L"NG7HS .. Crystal F ield Effect .. . ......... . .·. 2. Charge Transfer . 3 . Conjugate Bonds . RAD I AT I 8K - "'.A.TTER INTERACTION I N MICRO\\o,'AVE . ... 2 1

  20. Electric-Magnetic Duality and WDVV Equations

    E-Print Network [OSTI]

    B. de Wit; A. Marshakov

    2001-06-11

    We consider the associativity (or WDVV) equations in the form they appear in Seiberg-Witten theory and prove that they are covariant under generic electric-magnetic duality transformations. We discuss the consequences of this covariance from various perspectives.

  1. Characterizing orbit uncertainty due to atmospheric uncertainty 

    E-Print Network [OSTI]

    Wilkins, Matthew Paul

    2000-01-01

    In orbit prediction, there exists a need for accurate estimates of the accuracy of a prediction, i.e. the covariance. An accurate covariance is required for any number of purposes but, in particular, for probability of ...

  2. Characteristic hypersurfaces in a relativistic superfluid theory

    E-Print Network [OSTI]

    B. Linet

    1998-12-16

    By discussing the Cauchy problem, we determine the covariant equation of the characteristic hypersurfaces in a relativistic superfluid theory.

  3. Ecosystem carbon dioxide fluxes after disturbance in forests of North America

    E-Print Network [OSTI]

    2010-01-01

    ecosystem studies of the C consequences of these management options using eddy covariance will con- tinue to provide valuable information

  4. Lagrangian fluid mechanics

    E-Print Network [OSTI]

    Sawa Manoff

    2002-05-07

    The method of Lagrangians with covariant derivative (MLCD) is applied to a special type of Lagrangian density depending on scalar and vector fields as well as on their first covariant derivatives. The corresponding Euler-Lagrange's equations and energy-momentum tensors are found on the basis of the covariant Noether's identities.

  5. doc. RNDr. Arnost Komarek, Ph.D. Dept. of Probability and Mathematical Statistics

    E-Print Network [OSTI]

    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

  6. A review of "Poetry and the Making of the English Literary Past: 1660 – 1781." by Richard Terry 

    E-Print Network [OSTI]

    James Fitzmaurice

    2003-01-01

    terms earlier than 1750 and that discus- sions of this idea are not necessarily anachronistic. Less interesting for me than his arguments with those who theo- rize literary history broadly is Terry?s dealing, chapter by chapter, with a set of specific..., and the opposition between classical and gothic models for English literature. Terry?s achievement is in part ency- clopedic, for he discusses a great many books and in so doing cre- ates something like one of the dictionaries that he describes. Fortunately, he...

  7. Con ng i v n ang ti n ha M t nghin c u m i pht hi n, con ng i v n ang ch u s tc ng c a qu trnh

    E-Print Network [OSTI]

    Lummaa, Virpi

    Xaluan.com Trang Nh t Con ng i v n ang ti n hóa M t nghiên c u m i phát hi n, con ng i v n ang ch u s tác ng c a quá trình ch n l c t nhiên, gi ng nh nh ng loài sinh v t khác. Nói m t cách khác, s ti n hóa c a con ng i ti p t c tuân theo quy lu t "k thích h p nh t t n t i" trong thuy t ti n hóa c

  8. M.O. Wascko, LSU NuInt05 26 September, 2005

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverseIMPACTThousandReport) | SciTech ConnectFuture |0396 Some Comments on theO.

  9. Study of B??Xul?? decays in BB? events tagged by a fully reconstructed B-meson decay and determination of |Vub|

    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

    2012-08-07

    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

  10. OPAVAR : The Basics Based on version OPA8.2_VAR2.0

    E-Print Network [OSTI]

    ^^)(^ +=v kkk vGy 1- =),( 11 -- = kk G vy ,1 kkk vvv += - b vv =0 n The background error covariances

  11. "Title","Creator/Author","Publication Date","OSTI Identifier...

    Office of Scientific and Technical Information (OSTI)

    MODELS; PARTICLE MODELS; POSTULATED PARTICLES",,"The effective field theory of massive gravity has long been formulated in a generally covariant way N. Arkani-Hamed, H. Georgi,...

  12. Unitarity check in gravitational Higgs mechanism Berezhiani,...

    Office of Scientific and Technical Information (OSTI)

    MODELS; PARTICLE MODELS; POSTULATED PARTICLES The effective field theory of massive gravity has long been formulated in a generally covariant way N. Arkani-Hamed, H. Georgi,...

  13. Age-dependent variation in the biophysical properties of boreal forests

    E-Print Network [OSTI]

    McMillan, Andrew M. S.; Goulden, M. L.

    2008-01-01

    We thank Ed Read, Rob Elliot, Kelsie MacDuffee, and MarcyME, Read EL, Rocha AV, Elliot JR (2006) An eddy covariance

  14. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    (1) data covariances (1) discrete ordinate method (1) economics (1) efficiency (1) electricity (1) energy conservation, consumption, and utilization (1) energy planning,...

  15. Introduction `a l'assimilation de donnees Mod`ele numerique du mod`ele d'ondes de crues

    E-Print Network [OSTI]

    ´eriences num´eriques d'assimilation Matrices de covariance d'erreur Xt - Xb = b D´etermination En tout point d'espace

  16. CARBON DIOXIDE FLUXES IN A CENTRAL HARDWOODS OAK-HICKORY FOREST...

    Office of Scientific and Technical Information (OSTI)

    gas exchange (measured by eddy-covariance methods), vertical CO2 profile sampling and soil respiration along with meteorological parameters were monitored continuously. Early...

  17. Seek Help from Teachers or Fight Back? Student Perceptions of Teachers’ Actions during Conflicts and Responses to Peer Victimization

    E-Print Network [OSTI]

    Aceves, Mario J.; Hinshaw, Stephen P.; Mendoza-Denton, Rodolfo; Page-Gould, Elizabeth

    2010-01-01

    model B TAC ? ?ght back Fight back ? SA help 5. CovariateSeek Help from Teachers or Fight Back? Student Perceptions

  18. Sociospatial Inequality: A Multilevel and Geo-Spatial Analysis of Latino Poverty 

    E-Print Network [OSTI]

    Siordia, Carlos

    2012-02-14

    and Geographically Weighted Regression Covariates .......................... 100 Generalized Hierarchical Linear Modeling .................................... 103 Multilevel Logistic Models... ................................................................ 118 Geographic Weighted Regression Model ...................................... 122 Hierarchical and Geospatial Hybrid Model ................................... 129 Multi...

  19. Instructions

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    These correlations enter through the off-diagonal elements of the covariance matrix involved in the fit. See the following text for more details. I MINIBOONE PUBLIC DATA...

  20. EXTENDING METHODS FOR MODELING HETEROGENEITY IN NEST-SURVIVAL DATA USING GENERALIZED MIXED MODELS

    E-Print Network [OSTI]

    Rotella, Jay J.

    condiciones covariantes de interés. También condujimos simulaciones Monte Carlo para evaluar el desempeño de covariate conditions of interest. We also conduct Monte Carlo simulations to evaluate the performance

  1. Francis G. J. Perey | ornl.gov

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    determination and development of neutron-induced reaction cross sections, high-resolution neutron scattering, the nonlocal nuclear optical model, and uncertainty and covariance...

  2. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    respiration (1) ecosystems (1) eddy covariance (1) efficiency (1) managed and natural ecosystems (1) Filter by Author Wang, Weiguo (3) Bolstad, Paul V. (2) Chen, Jiquan...

  3. Vegetation and Waterfowl Response to Imazapyr-control of Alternanthera philoxeroides

    E-Print Network [OSTI]

    Gray, Matthew

    2 Logistics Late November-late February Survey 1x/week Sunrise-5 hours, Foraging, Inactive, Locomotion, Maintenance Covariates Disturbances

  4. Climate change and uncertainty in ecological niche modeling

    E-Print Network [OSTI]

    Alvarez, Otto

    2011-01-01

    DEM), slope, aspect, solar potential, radio detection andslope, aspect, and solar potential), dependent variables (covariate. Aspect and solar potential have the highest

  5. T Trng Hin1, Nguyn Vit Phng1

    E-Print Network [OSTI]

    Shahabi, Cyrus

    d liu thuc các t chc, và tính cng tác chia s d liu trong các nhóm hay trong các lnh vc nghiên cu, cng nh bài toán qun lý tài liu in t trên mng nói riêng. Trong bài báo này, chúng tôi trình bày Gii tài liu, tìm kim, ánh ch mc, so khp vn bn... - Tng trình din: c trin khai theo mô hình cng thông tin

  6. Combining environmental chemistry, somatic biomarkers, and population genetics: an innovative approach in wildlife ecotoxicology 

    E-Print Network [OSTI]

    Matson, Cole Wesley

    2004-09-30

    -Fluoranthenes/Pyrenes 17.8 < D.L. 5.9 Benz(a)anthracene 3.8 1.0 32.9 Chrysene 17.70.446.1 C1-Chrysenes 26.2< D.L. 14.1 C2-Chrysenes 20.7< D.L. 9.6 C3-Chrysenes 8.2< D.L. 2.0 C4-Chrysenes 2.2< D.L. 5.0 Benzo(b)fluoranthene 11.0 0.3 57.7 Benzo(k)fluoranthene 1.6 0...: ____________________________ ____________________________ John W. Bickham Theo Colborn (Chair of Committee) (Member) ____________________________ ____________________________ Rodney L. Honeycutt Gilbert T. Rowe (Member) (Member) ____________________________ Robert D. Brown (Head...

  7. Recent advances in coronal heating

    E-Print Network [OSTI]

    De Moortel, Ineke

    2015-01-01

    The solar corona, the tenuous outer atmosphere of the Sun, is orders of magnitude hotter than the solar surface. This 'coronal heating problem' requires the identification of a heat source to balance losses due to thermal conduction, radiation and (in some locations) convection. The review papers in this Theo Murphy meeting issue present an overview of recent observational findings, large- and small-scale numerical modelling of physical processes occurring in the solar atmosphere and other aspects which may affect our understanding of the proposed heating mechanisms. At the same time, they also set out the directions and challenges which must be tackled by future research. In this brief introduction, we summarize some of the issues and themes which reoccur throughout this issue.

  8. c n Trung Quc n n n n Malaysia n Nam Phi monash.edu Ti sao cn hc i hc?

    E-Print Network [OSTI]

    Sekercioglu, Y. Ahmet

    trong hai mi nm qua. Các ngành ngh và khóa hc truyn thng ã thay i và danh sách các khóa hc cng nh c hi sinh viên hin ang theo hc cng là mt ngun thông tin tuyt vi tìm hiu v nhng la chn và cuc sng ti trng i tháng 9, mc dù các hc sinh cng có th np h s ngoài thi gian này. VTAC cng là ni con ca quý v có th np n

  9. Cc Qun tr Hng khng v Khng gian Quc gia Chng trnh H thng Khng phn

    E-Print Network [OSTI]

    cu Ames NASA và Trung tâm Nghiên cu Langley NASA--cng nh cng tác vi ngành, gii hc vin và các c quan sân bay, trin khai và máy bay; và Gim thi gian di chuyn cng nh nhng chm tr liên quan n di chuyn. Hình nh (Theo chiu kim ng h, t trái sang phi) Phòng thí nghim Vn hành Không lu: Phòng thí nghim này, cng

  10. Electric dipole response of 208Pb from proton inelastic scattering: constraints on neutron skin thickness and symmetry energy

    E-Print Network [OSTI]

    A. Tamii; P. von Neumann-Cosel; I. Poltoratska

    2013-10-02

    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.

  11. Nash Bargaining over MIMO Interference Systems Zengmao Chen, Sergiy A. Vorobyov, Cheng-Xiang Wang, and John Thompson

    E-Print Network [OSTI]

    Wang, Cheng-Xiang

    Nash Bargaining over MIMO Interference Systems Zengmao Chen, Sergiy A. Vorobyov, Cheng-Xiang Wang condition for the uniqueness of the Nash bargaining (NB) solution. The structure of the source covariance with the covariance matrices leading to the Nash equilibrium (NE). The existence of the NB solution and concavity

  12. This article was downloaded by:[University of Iowa Libraries] [University of Iowa Libraries

    E-Print Network [OSTI]

    Lee, John D.

    Street, London W1T 3JH, UK Theoretical Issues in Ergonomics Science Publication details, including for time-dependent covariates in driving simulator studies', Theoretical Issues in Ergonomics Science, 1 in Ergonomics Science 2007, 1­11, iFirst Accounting for time-dependent covariates in driving simulator studies

  13. REDUCTION OF RESTRICTED MAXIMUM LIKELIHOOD FOR

    E-Print Network [OSTI]

    correction may be better understood. A mixed linear model consists of a #12;xed e#11;ects vector, #11;, a #12;xed e#11;ects covariate matrix, X , a random e#11;ects covariate matrix, Z , and three random vectors; the measurement vector, y, the measurement error vector, e, and the random e#11;ects vector, #12;, which satisfy

  14. IEEE GEOSCIENCE AND REMOTE SENSING LETTERS 1 Effect of signal contamination in matched-filter

    E-Print Network [OSTI]

    Theiler, James

    IEEE GEOSCIENCE AND REMOTE SENSING LETTERS 1 Effect of signal contamination in matched of including some of the target signal in the background scene. Although the covariance is contaminated observe an order of magnitude loss in SCR for a matched filter based on the contaminated covariance. Index

  15. Interannual variability in the peatland-atmosphere carbon dioxide exchange at an ombrotrophic bog

    E-Print Network [OSTI]

    Roulet, Nigel T.

    Interannual variability in the peatland-atmosphere carbon dioxide exchange at an ombrotrophic bog covariance measurements of net ecosystem carbon dioxide (CO2) exchange (NEE) were taken at an ombrotrophic covariance, carbon dioxide Citation: Lafleur, P. M., N. T. Roulet, J. L. Bubier, S. Frolking, and T. R. Moore

  16. A MULTI-MICROPHONE BEAMFORMER WITH AN EIGENDOMAIN POST-FILTER Firas Jabloun and Beno^it Champagne

    E-Print Network [OSTI]

    Champagne, Benoît

    is also considered. Experimental results us- ing different objective measures are reported. 1 is the noise vec- tor with covariance matrix Rw. The eigenvalue decomposi- tion (ED) of the covariance matrix 's in decreasing order. In this pa- per, we also assume that the noise is white with Rw = 2 I so

  17. Constrained capacity of MIMO Rayleigh fading channels 

    E-Print Network [OSTI]

    He, Wenyan

    2011-08-08

    though) as the deflnition of outage capacity in (2.4). Telatar conjectured that the optimal input covariance matrix Q is a diagonal matrix with the power equally shared among a subset of the transmit antennas [1]. Furthermore, the higher the rate... . . . . . . . . . . . . . . . . . . . . . . . 8 B. Outage Capacity . . . . . . . . . . . . . . . . . . . . . . . 9 III PSK CONSTRAINED MIMO CAPACITY : : : : : : : : : : : : 13 A. PSK Constrained MIMO Capacity . . . . . . . . . . . . . 13 1. The Covariance Matrix...

  18. Modeling and Processing of High Dimensional Signals and Systems Using

    E-Print Network [OSTI]

    1 Modeling and Processing of High Dimensional Signals and Systems Using the Sparse Matrix Transform Experimental results on medical imaging Covariance estimation for high dimensional signals SMT framework SMT for covariance estimation Experimental results of SMT for modeling hyper-spectral data and face images

  19. Mach Learn (2009) 75: 167197 DOI 10.1007/s10994-009-5102-1

    E-Print Network [OSTI]

    Igel, Christian

    2009-01-01

    Mach Learn (2009) 75: 167­197 DOI 10.1007/s10994-009-5102-1 Efficient covariance matrix update when the gradient of an objective function (e.g., loss, energy, or reward function) cannot be computed update mechanism which can replace a rank-one covariance matrix update and the computationally expensive

  20. Decades: 1760-1800 

    E-Print Network [OSTI]

    Multiple Contributors

    1982-01-01

    made............................................ 30 12. Correlations involving certain variables in the Hudgins Brahman cattle.......................................... 32 13? Average age, weight and phosphatase of the Frost Brahman cattle.................................................... 32 14. Analysis of variance and covariance of initial phosphatase in the Frost Brahman cattle......... .................... 34 Page LIST OF TABLES (Continued) 15. Analysis of variance and covariance of final phosphatase in the Frost Brahman...

  1. Machine Learning 10601 Recitation 6

    E-Print Network [OSTI]

    Gordon, Geoffrey J.

    Gaussians · Logistic regression #12;Multivariate Gaussians (or "multinormal distribution, The covariance matrix will be an diagonal one. Reverse is also true: If the covariance matrix is a diagonal one of Gaussians: Component Mixing coefficient K=3 #12;Logistic regression Linear regression Outcome

  2. Study of Bbar to Xu l nubar Decays in BBbar Events Tagged by a Fully Reconstructed B-meson Decay and Determination of |V_{ub}|

    SciTech Connect (OSTI)

    Lees, J.P.

    2012-07-13

    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.

  3. Study of B??Xul?? decays in BB? events tagged by a fully reconstructed B-meson decay and determination of |Vub|

    SciTech Connect (OSTI)

    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.

    2012-08-07

    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.

  4. Sample size in factor analysis: The role of model error

    E-Print Network [OSTI]

    MacCallum, R. C.; Widaman, K. F.; Preacher, Kristopher J.; Hong, Sehee

    2001-01-01

    Equation 1: (2) H9018 yy = H9011H9021H9011H11032 + H9008 2 where H9018 yy is the p ? p population covariance matrix for the measured variables and H9021 is the r ? r population correlation matrix for the common factors (assuming factors are standardized... in the population). This is the standard version of the common factor model for a population covariance matrix. Following similar algebraic procedures, we could derive a structure for a sample covariance matrix, C yy . However, in such a derivation we can...

  5. TITLE AUTHORS SUBJECT SUBJECT RELATED DESCRIPTION PUBLISHER AVAILABILI...

    Office of Scientific and Technical Information (OSTI)

    MODELS PARTICLE MODELS POSTULATED PARTICLES The effective field theory of massive gravity has long been formulated in a generally covariant way N Arkani Hamed H Georgi and M D...

  6. Dissolved gaseous mercury behavior in shallow water estuaries 

    E-Print Network [OSTI]

    Landin, Charles Melchor

    2009-05-15

    , increased wind speed should enhance air to water transfer of elemental mercury, thus one would expect a negative correlation. DGM co-varied negatively with salinity during the continuous studies, suggesting that the DGM pool is reduced in surface waters...

  7. Test particle motion in modified gravity theories

    E-Print Network [OSTI]

    Mahmood Roshan

    2013-02-05

    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. $\

  8. Developing Voices for Smart Homes: User Personality and Synthetic Voice Interaction 

    E-Print Network [OSTI]

    Boye, Greta

    2007-11-28

    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 ...

  9. heavy-snowfall area. The annual NEP (net ecosystem productiv-

    E-Print Network [OSTI]

    heavy-snowfall area. The annual NEP (net ecosystem productiv- ity) observed by eddy covariance and the duration of the growing season were important factors with regards to annual NEP. Additional detailed

  10. The Quantitative Genetics of Mate Choice Evolution: Theory and Empiricism 

    E-Print Network [OSTI]

    Ratterman, Nicholas 1981-

    2012-11-15

    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...

  11. Stochastic and Deterministic Inversion Methods for History Matching of Production and Time-Lapse Seismic Data 

    E-Print Network [OSTI]

    Watanabe, Shingo

    2013-08-26

    -based inversion methods as a deterministic approach for integrating both production and time-lapse seismic data into high resolution reservoir models. For the ensemble Kalman filter, we develope a physically motivated phase streamline-based covariance...

  12. Annual Report: 0621014 Page 1 of 30

    E-Print Network [OSTI]

    Lawrence, Deborah

    focuses on land-atmosphere carbon dioxide fluxes in marshes using tower-based eddy covariance technique: Co-PI, Naval Research Laboratory; research focuses on hyperspectral remote sensing of mainland

  13. Annual Report: 0621014 Page 1 of 23

    E-Print Network [OSTI]

    Lawrence, Deborah

    focuses on land-atmosphere carbon dioxide fluxes in marshes using tower-based eddy covariance technique: Co-PI, Naval Research Laboratory; research focuses on hyperspectral remote sensing of mainland

  14. Annual Report: 0621014 Page 1 of 27

    E-Print Network [OSTI]

    Lawrence, Deborah

    focuses on land-atmosphere carbon dioxide fluxes in marshes using tower-based eddy covariance technique: Co-PI, Naval Research Laboratory; research focuses on hyperspectral remote sensing of mainland

  15. Annual Report: 0621014 Page 1 of 49

    E-Print Network [OSTI]

    Lawrence, Deborah

    focuses on land-atmosphere carbon dioxide fluxes in marshes using tower-based eddy covariance technique: Co-PI, Naval Research Laboratory; research focuses on hyperspectral remote sensing of mainland

  16. The impact of land cover change on carbon and water cycling in the US Central Plains grasslands

    E-Print Network [OSTI]

    Buck, Tyler

    2010-07-30

    Using the eddy covariance technique, the impact of land cover variability on carbon and water cycling was examined at three different grasslands in Northeast Kansas. One site 8 km north of Lawrence, Kansas at the Nelson Environmental Study Area...

  17. Annual Report: 0621014 Page 1 of 36

    E-Print Network [OSTI]

    Lawrence, Deborah

    focuses on land-atmosphere carbon dioxide fluxes in marshes using tower-based eddy covariance technique: Co-PI, Naval Research Laboratory; research focuses on hyperspectral remote sensing of mainland

  18. Multiscale Interactions between Water and Carbon Fluxes and Environmental Variables in A Central U.S. Grassland

    E-Print Network [OSTI]

    Brunsell, Nathaniel A.; Wilson, Cassandra J.

    2013-04-10

    The temporal interactions between water and carbon cycling and the controlling environmental variables are investigated using wavelets and information theory. We used 3.5 years of eddy covariance station observations from an abandoned agricultural...

  19. Carbon and Water Cycling in a Texas Hill Country Woodland 

    E-Print Network [OSTI]

    Kamps, Ray Herbert

    2014-12-11

    -dominant species partition the scarce water resource under varying annual precipitation patterns. Eddy covariance and dendrochronology techniques were used to investigate carbon and water cycling from 2004 to 2012 in this setting. Essential information...

  20. Unions, Job Training, and the Wages of Foreign-Born Workers in the U.S.

    E-Print Network [OSTI]

    Chen, Hung-Lin

    2010-01-01

    immigrants. Furthermore, the PSM results show that the jobthe 0.05 level. For OLS and PSM, all observable covariatesthe 0.05 level. For OLS and PSM, all observable covariates

  1. GEORGIOS HOMEPAGE

    E-Print Network [OSTI]

    Multi-output Gaussian process emulator with nonseparable auto-covariance ... of carbon capture technologies from discovery to development, demonstration, and ... On the Bayesian treed multivariate Gaussian process with linear model of ...

  2. Bayesian Semiparametric Density Deconvolution and Regression in the Presence of Measurement Errors 

    E-Print Network [OSTI]

    Sarkar, Abhra

    2014-06-24

    Although the literature on measurement error problems is quite extensive, solutions to even the most fundamental measurement error problems like density deconvolution and regression with errors-in-covariates are available ...

  3. Second Level Cluster Dependencies: A Comparison of Modeling Software and Missing Data Techniques 

    E-Print Network [OSTI]

    Larsen, Ross Allen Andrew

    2011-10-21

    Dependencies in multilevel models at the second level have never been thoroughly examined. For certain designs first-level subjects are independent over time, but the second level subjects may exhibit nonzero covariances ...

  4. On adaptive transmission, signal detection and channel estimation for multiple antenna systems 

    E-Print Network [OSTI]

    Xie, Yongzhe

    2004-11-15

    study the minimum outage probability transmission schemes in a multiple-input-single-output (MISO) flat fading channel assuming partial CSIT. Considering two special cases: the mean feedback and the covariance feedback, we derive the optimum spatial...

  5. Partonic coalescence in relativistic heavy ion collisions 

    E-Print Network [OSTI]

    Greco, V.; Ko, Che Ming; Levai, P.

    2003-01-01

    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...

  6. Late Emerging Reading Difficulties in English Language Learners

    E-Print Network [OSTI]

    Garcia, Nicole Marie

    2015-01-01

    Collins, L. M. (2011). Proc LCA and Proc LTA users’ guide (for Current Study Figure 4 LCA Item Response Probabilitiesa covariate to the 2-class LCA model The English Expressive

  7. Square Root of Metric: The Geometry Background of Unified Theory?

    E-Print Network [OSTI]

    De-Sheng Li

    2015-09-29

    We use the square root of inverse metric described by $l=u^{\\dagger} \\gamma^{a} u \\theta_{a}$ construct an $U(4)$ gauge invariant, locally Lorentz invariant and generally covariant Lagrangian $\\mathcal{L}=\

  8. Star Products for Relativistic Quantum Mechanics

    E-Print Network [OSTI]

    P. Henselder

    2007-05-24

    The star product formalism has proved to be an alternative formulation for nonrelativistic quantum mechanics. We want introduce here a covariant star product in order to extend the star product formalism to relativistic quantum mechanics in the proper time formulation.

  9. New approaches to higher-dimensional general relativity

    E-Print Network [OSTI]

    Durkee, Mark N.

    2011-06-07

    the Newman-Penrose formalism can be unnecessarily complicated. To address this, I describe new work introducing a higher-dimensional generalization of the so-called Geroch-Held-Penrose formalism, which allows for a partially covariant reformulation...

  10. Ecosystem fluxes of hydrogen: a comparison of flux-gradient methods

    E-Print Network [OSTI]

    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 ...

  11. Foundations for Relativistic Quantum Theory I: Feynman's Operator Calculus and the Dyson Conjectures

    E-Print Network [OSTI]

    of the charge. The thinking of the times was clearly expressed by Oppenheimer8 in his 1948 report to the Solvay process could be carried out in a covariant manner. Schwinger developed the general theory and applied

  12. A comparison of global optimization algorithms with standard benchmark functions and real-world applications using Energy Plus

    E-Print Network [OSTI]

    Kamph, Jerome Henri

    2010-01-01

    world applications using EnergyPlus J´ rˆ me Henri K¨ mpfalgorithm; application using EnergyPlus; Covariance MatrixBradley & Kummert, 2005) and EnergyPlus (ENE, 2009). When it

  13. Testing the Effectiveness of Various Commonly Used Fit Indices for Detecting Misspecifications in Multilevel Structure Equation Models 

    E-Print Network [OSTI]

    Hsu, Hsien-Yuan

    2011-02-22

    various conditions. Simulation results showed that RMSEA and CFI only reflected within-model fit. In addition, SRMR for within-model (SRMR-W) was more sensitive to within-model misspecifications in factor covariances than pattern coefficients regardless...

  14. Instructions

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    lations. These correlations enter through the off-diagonal elements of the covariance matrix involved in the fit. See the following text for more details. I MINIBOONE PUBLIC DATA...

  15. Method and system to estimate variables in an integrated gasification combined cycle (IGCC) plant

    SciTech Connect (OSTI)

    Kumar, Aditya; Shi, Ruijie; Dokucu, Mustafa

    2013-09-17

    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.

  16. Precise estimation of the geoposition and orientation of ground-level video cameras from multiple sensors

    E-Print Network [OSTI]

    Ochoa, Benjamin L.

    2007-01-01

    in the unrotated coordinate Table 1.1: Standard GPS errorused as the principal coordinate Table 2.2: Common referenceerror table. Speci?cally, the covariance of the coordinates

  17. Biomarkers of rapid chronic kidney disease progression in type 2 diabetes

    E-Print Network [OSTI]

    Looker, Helen C.; Colombo, Marco; Hess, Sibylle; Brosnan, Mary J.; Farran, Bassam; Dalton, R. Neil; Wong, Max C.; Turner, Charles; Palmer, Colin N. A.; Nogoceke, Everson; Groop, Leif; Salomaa, Veikko; Dunger, David B.; Agakov, Felix; McKeigue, Paul M.; Colhoun, Helen M.

    2015-07-22

    records ascertained prospectively. Covariate data including prescription information, blood pressure and anthropometry 16 results were obtained by extraction from the ongoing primary care and hospital diabetes electronic records. Laboratory data...

  18. ForPeerReview Bayesian Hierarchical Model for Large-Scale

    E-Print Network [OSTI]

    Hero, Alfred O.

    . The traditional approaches tend to give rise to high variance and low accuracy due to "overfitting". We cast of the covariance matrix via shrinkage combined with analytic determination of the shrinkage intensity according

  19. Earth and Planetary Science Letters 420 (2015) 5565 Contents lists available at ScienceDirect

    E-Print Network [OSTI]

    2015-01-01

    paleoclimate astrobiology stratigraphy rivers River deposits are one of the main lines of evidence that tell us higher in the stratigraphy. Meander wavelength and channel width covary with stratigraphic elevation

  20. Rheumatic Heart Disease and Beta-hemolytic Streptococci in Salvador, Brazil: A Study of Slum Health

    E-Print Network [OSTI]

    Tartof, Sara Yee

    2010-01-01

    medicine in Southern Brazil. Ann Emerg Med 2001 Feb;37(2):Horizonte, Minas Gerais, Brazil, 1999]. Cad Saude Publicaand sore throat in Salvador, Brazil. Covariate Slum Age 3-5

  1. Bayesian Gaussian Graphical models using sparse selection priors and their mixtures 

    E-Print Network [OSTI]

    Talluri, Rajesh

    2012-10-19

    methods are based on selection and shrinkage priors leading to parsimonious parameterization of the precision (inverse covariance) matrix, which is essential in several applications in learning relationships among the variables. In Chapter I, we employ...

  2. Copyright 0 1996 by the Genetics Society of America Change of Genetic Architecturein Response to Sex

    E-Print Network [OSTI]

    Lynch, Michael

    - tions (meansand geneticvariation-covariation) (MATHER 1942, 1943; GRIFFIN1960; BULMER1971; LANDE 1975; CHARLESWORTH1990; BURGER1993; GA- W L E T S and HASTINGS 1995).Experimental evidence for nonadditive genetic

  3. On the Energy Momentum Tensor of the M-Theory Fivebrane

    E-Print Network [OSTI]

    O. Baerwald; N. D. Lambert; P. C. West

    1999-04-14

    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.

  4. s-PROCESS Sr ISOTOPIC COMPOSITIONS IN PRESOLAR SiC FROM THE MURCHISON METEORITE F. A. Podosek,1

    E-Print Network [OSTI]

    indicate covariation of the factors governing neutron exposure and grain growth kinetics in a manner or terrestrial contaminant. It is believed that the SiC condenses in the expanding atmospheres of AGB stars

  5. Correlational properties of two-dimensional solvable chaos on the unit circle

    E-Print Network [OSTI]

    Aki-Hiro Sato; Ken Umeno

    2012-08-30

    This article investigates correlational properties of two-dimensional chaotic maps on the unit circle. We give analytical forms of higher-order covariances. We derive the characteristic function of their simultaneous and lagged ergodic densities. We found that these characteristic functions are described by three types of two-dimensional Bessel functions. Higher-order covariances between x and y and those between y and y show non-positive values. Asymmetric features between cosine and sine functions are elucidated.

  6. Statistics for characterizing data on the periphery

    SciTech Connect (OSTI)

    Theiler, James P; Hush, Donald R

    2010-01-01

    We introduce a class of statistics for characterizing the periphery of a distribution, and show that these statistics are particularly valuable for problems in target detection. Because so many detection algorithms are rooted in Gaussian statistics, we concentrate on ellipsoidal models of high-dimensional data distributions (that is to say: covariance matrices), but we recommend several alternatives to the sample covariance matrix that more efficiently model the periphery of a distribution, and can more effectively detect anomalous data samples.

  7. Comparing Surface and Mid-Tropospheric CO2 Concentrations from Central U.S. Grasslands

    E-Print Network [OSTI]

    Cochran, Ferdouz V.; Brunsell, Nathaniel A.; Mechem, David B.

    2013-02-06

    and senescence within the ABL are captured by eddy covariance (EC) tower measurements [24]. In an effort to advance studies of carbon dynamics, national and international observatory networks, such as AmeriFlux, FLUXNET, and the National Ecological Observatory... of Lawrence, Kansas, in a tallgrass prairie and deciduous forest ecotone. The eddy covariance (EC) tower at this upland site is part of the AmeriFlux network and started collecting data on July 15, 2007. It is within an abandoned grassland currently dominated...

  8. IMPROVING CORRELATION FUNCTION FITTING WITH RIDGE REGRESSION: APPLICATION TO CROSS-CORRELATION RECONSTRUCTION

    SciTech Connect (OSTI)

    Matthews, Daniel J.; Newman, Jeffrey A., E-mail: djm70@pitt.edu, E-mail: janewman@pitt.edu [Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara Street, Pittsburgh, PA 15260 (United States)

    2012-02-01

    Cross-correlation techniques provide a promising avenue for calibrating photometric redshifts and determining redshift distributions using spectroscopy which is systematically incomplete (e.g., current deep spectroscopic surveys fail to obtain secure redshifts for 30%-50% or more of the galaxies targeted). In this paper, we improve on the redshift distribution reconstruction methods from our previous work by incorporating full covariance information into our correlation function fits. Correlation function measurements are strongly covariant between angular or spatial bins, and accounting for this in fitting can yield substantial reduction in errors. However, frequently the covariance matrices used in these calculations are determined from a relatively small set (dozens rather than hundreds) of subsamples or mock catalogs, resulting in noisy covariance matrices whose inversion is ill-conditioned and numerically unstable. We present here a method of conditioning the covariance matrix known as ridge regression which results in a more well behaved inversion than other techniques common in large-scale structure studies. We demonstrate that ridge regression significantly improves the determination of correlation function parameters. We then apply these improved techniques to the problem of reconstructing redshift distributions. By incorporating full covariance information, applying ridge regression, and changing the weighting of fields in obtaining average correlation functions, we obtain reductions in the mean redshift distribution reconstruction error of as much as {approx}40% compared to previous methods. We provide a description of POWERFIT, an IDL code for performing power-law fits to correlation functions with ridge regression conditioning that we are making publicly available.

  9. Space-Time Models based on Random Fields with Local Interactions

    E-Print Network [OSTI]

    Dionissios T. Hristopulos; Ivi C. Tsantili

    2015-03-06

    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.

  10. Multi Jet Production at High Q2

    E-Print Network [OSTI]

    Thomas Kluge

    2005-10-31

    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 $\\alpha_s(m_Z) = 0.1175 \\pm 0.0017 (\\mathrm{stat.}) \\pm 0.0050 (\\mathrm{syst.}) ^{+0.0054}_{-0.0068} (\\mathrm{theo.})$.

  11. Observation of the diphoton decay of the Higgs boson and measurement of its properties

    SciTech Connect (OSTI)

    Khachatryan, A. M.

    2014-10-15

    Observation of the diphoton decay mode of the recently discovered Higgs boson and measurement of some of its properties are reported. The analysis uses the entire dataset collected by the CMS experiment in proton-proton collisions during the 2011 and 2012 LHC running periods. The data samples correspond to integrated luminosities of 5.1fb-1 at ?s=7 TeV and 19.7fb-1 at 8TeV. A clear signal is observed in the diphoton channel at a mass close to 125GeV with a local significance of 5.7?, where a significance of 5.2? is expected for the standard model Higgs boson. The mass is measured to be 124.70 ± 0.34 GeV = 124.70 ± 0.31(stat) ± 0.15(syst) GeV, and the best-fit signal strength relative to the standard model prediction is 1.14+0.26–0.23 = 1.14 ± 0.21(stat) +0.09–0.05(syst) +0.13–0.09(theo). Thus, additional measurements include the signal strength modifiers associated with different production mechanisms, and hypothesis tests between spin-0 and spin-2 models.

  12. Observation of the diphoton decay of the Higgs boson and measurement of its properties

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Khachatryan, A. M.

    2014-10-15

    Observation of the diphoton decay mode of the recently discovered Higgs boson and measurement of some of its properties are reported. The analysis uses the entire dataset collected by the CMS experiment in proton-proton collisions during the 2011 and 2012 LHC running periods. The data samples correspond to integrated luminosities of 5.1fb-1 at ?s=7 TeV and 19.7fb-1 at 8TeV. A clear signal is observed in the diphoton channel at a mass close to 125GeV with a local significance of 5.7?, where a significance of 5.2? is expected for the standard model Higgs boson. The mass is measured to be 124.70more »± 0.34 GeV = 124.70 ± 0.31(stat) ± 0.15(syst) GeV, and the best-fit signal strength relative to the standard model prediction is 1.14+0.26–0.23 = 1.14 ± 0.21(stat) +0.09–0.05(syst) +0.13–0.09(theo). Thus, additional measurements include the signal strength modifiers associated with different production mechanisms, and hypothesis tests between spin-0 and spin-2 models.« less

  13. Constraints on parton distribution functions and extraction of the strong coupling constant from the inclusive jet cross section in pp collisions at $\\sqrt{s}$ = 7 TeV

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Khachatryan, Vardan

    2014-10-27

    The inclusive jet cross section for proton-proton collisions at a centre-of-mass energy of 7$~\\mathrm{TeV}$ was measured by the CMS Collaboration at the LHC with data corresponding to an integrated luminosity of 5.0$~\\mathrm{fb}^{-1}$. The measurement covers a phase space up to 2$~\\mathrm{TeV}$ 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 quantummore »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 $M_{\\mathrm{Z}}$ is determined to be $\\alpha_S(M_{\\mathrm{Z}}) = 0.1185 \\pm 0.0019\\,(\\mathrm{exp})\\,^{+0.0060}_{-0.0037}\\,(\\mathrm{theo})$, which is in agreement with the world average.« less

  14. Measurement of the inclusive 3-jet production differential cross section in proton-proton collisions at 7 TeV and determination of the strong coupling constant in the TeV range

    SciTech Connect (OSTI)

    Khachatryan, Vardan

    2015-05-01

    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).

  15. Constraints on parton distribution functions and extraction of the strong coupling constant from the inclusive jet cross section in pp collisions at $\\sqrt{s}$ = 7 TeV

    SciTech Connect (OSTI)

    Khachatryan, Vardan

    2014-10-27

    The inclusive jet cross section for proton-proton collisions at a centre-of-mass energy of 7$~\\mathrm{TeV}$ was measured by the CMS Collaboration at the LHC with data corresponding to an integrated luminosity of 5.0$~\\mathrm{fb}^{-1}$. The measurement covers a phase space up to 2$~\\mathrm{TeV}$ 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 $M_{\\mathrm{Z}}$ is determined to be $\\alpha_S(M_{\\mathrm{Z}}) = 0.1185 \\pm 0.0019\\,(\\mathrm{exp})\\,^{+0.0060}_{-0.0037}\\,(\\mathrm{theo})$, which is in agreement with the world average.

  16. Measurement of the inclusive 3-jet production differential cross section in proton-proton collisions at 7 TeV and determination of the strong coupling constant in the TeV range

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Khachatryan, Vardan

    2015-05-01

    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

  17. Measurement of the B0(s) - anti-B0(s) Oscillation Frequency

    SciTech Connect (OSTI)

    Abulencia, A.; Acosta, D.; Adelman, Jahred A.; Affolder, T.; Akimoto, T.; Albrow, M.G.; Ambrose, D.; Amerio, S.; Amidei, D.; Anastassov, A.; Anikeev, K.; /Taiwan, Inst. Phys. /Argonne /Barcelona, IFAE /Baylor U. /INFN, Bologna /Bologna U. /Brandeis U. /UC, Davis /UCLA /UC, San Diego /UC, Santa Barbara

    2006-06-01

    The authors present the first measurement of the B{sub s}{sup 0}-{bar B}{sub s}{sup 0} oscillation frequency {Delta}m{sub s}. They use 1 fb{sup -1} of data from p{bar p} collisions at {radical}s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. The sample contains signals of 3600 fully reconstructed hadronic B{sub s} decays and 37,000 partially reconstructed semileptonic B{sub s} decays. They measure the probability as a function of proper decay time that the B{sub s} decays with the same, or opposite, flavor as the flavor at production and they find a signal consistent with B{sub s}{sup 0}-{bar B}{sub s}{sup 0} oscillations. The probability that random fluctuations could produce a comparable signal is 0.2%. Under the hypothesis that the signal is due to B{sub s}{sup 0}-{bar B}{sub s}{sup 0} oscillations, they measure {Delta}m{sub s} = 17.31{sub -0.18}{sup +0.33}(stat.) {+-} 0.07(syst.) ps{sup -1} and determine |V{sub td}/V{sub ts}| = 0.208{sub -0.002}{sup +0.001}(exp.){sub -0.006}{sup +0.008}(theo.).

  18. Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Khachatryan, Vardan

    2015-05-14

    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

  19. Constraints on parton distribution functions and extraction of the strong coupling constant from the inclusive jet cross section in pp collisions at sqrt(s) = 7 TeV

    E-Print Network [OSTI]

    CMS Collaboration

    2015-07-02

    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.

  20. Erratum: A Comparison of Closures for Stochastic Advection-Diffusion Equations

    SciTech Connect (OSTI)

    Jarman, Kenneth D.; Tartakovsky, Alexandre M.

    2015-01-01

    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.

  1. Spectral diagonal ensemble Kalman filters

    E-Print Network [OSTI]

    Kasanický, Ivan; Vejmelka, Martin

    2015-01-01

    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.

  2. Shrinking cloaks in expanding spacetimes: the role of coordinates and the meaning of transformations in Transformation Optics

    E-Print Network [OSTI]

    Robert T. Thompson; Mohsen Fathi

    2015-06-29

    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.

  3. Einstein's Hydrogen Atom

    E-Print Network [OSTI]

    Y. S. Kim

    2011-12-02

    In 1905, Einstein formulated his special relativity for point particles. For those particles, his Lorentz covariance and energy-momentum relation are by now firmly established. How about the hydrogen atom? It is possible to perform Lorentz boosts on the proton assuming that it is a point particle. Then what happens to the electron orbit? The orbit could go through an elliptic deformation, but it is not possible to understand this problem without quantum mechanics, where the orbit is a standing wave leading to a localized probability distribution. Is this concept consistent with Einstein's Lorentz covariance? Dirac, Wigner, and Feynman contributed important building blocks for understanding this problem. The remaining problem is to assemble those blocks to construct a Lorentz-covariant picture of quantum bound states based on standing waves. It is shown possible to assemble those building blocks using harmonic oscillators.

  4. Bayesian inference on the sphere beyond statistical isotropy

    E-Print Network [OSTI]

    Das, Santanu; Souradeep, Tarun

    2015-01-01

    We present a general method for Bayesian inference of the underlying covariance structure of random fields on a sphere. We employ the Bipolar Spherical Harmonic (BipoSH) representation of general covariance structure on the sphere. We illustrate the efficacy of the method as a principled approach to assess violation of statistical isotropy (SI) in the sky maps of Cosmic Microwave Background (CMB) fluctuations. SI violation in observed CMB maps arise due to known physical effects such as Doppler boost and weak lensing; yet unknown theoretical possibilities like cosmic topology and subtle violations of the cosmological principle, as well as, expected observational artefacts of scanning the sky with a non-circular beam, masking, foreground residuals, anisotropic noise, etc. We explicitly demonstrate the recovery of the input SI violation signals with their full statistics in simulated CMB maps. Our formalism easily adapts to exploring parametric physical models with non-SI covariance, as we illustrate for the in...

  5. A Gibbs Sampler for Multivariate Linear Regression

    E-Print Network [OSTI]

    Mantz, Adam B

    2015-01-01

    Kelly (2007, hereafter K07) described an efficient algorithm, using Gibbs sampling, for performing linear regression in the fairly general case where non-zero measurement errors exist for both the covariates and response variables, where these measurements may be correlated (for the same data point), where the response variable is affected by intrinsic scatter in addition to measurement error, and where the prior distribution of covariates is modeled by a flexible mixture of Gaussians rather than assumed to be uniform. Here I extend the K07 algorithm in two ways. First, the procedure is generalized to the case of multiple response variables. Second, I describe how to model the prior distribution of covariates using a Dirichlet process, which can be thought of as a Gaussian mixture where the number of mixture components is learned from the data. I present an example of multivariate regression using the extended algorithm, namely fitting scaling relations of the gas mass, temperature, and luminosity of dynamica...

  6. Mathisson-Papapetrou Equations as Conditions for Compatibility of General Relativity and Continuum Physics

    E-Print Network [OSTI]

    Wolfgang Muschik; Horst-Heino v. Borzeszkowski

    2013-04-14

    In continuum physics is presupposed that general-relativistic balance equations are valid which are created from the Lorentz-covariant ones by application of the equivalence principle. Consequently, the question arises, how to make these general-covariant balances compatible with Einstein's field equations. The compatibility conditions are derived by performing a modified Belinfante-Rosenfeld symmetrization for the non-symmetric and not divergence-free general-relativistic energy-momentum tensor. The procedure results in the Mathisson-Papapetrou equations.

  7. Projection operator approach to general constrained systems

    E-Print Network [OSTI]

    Igor Batalin; Simon Lyakhovich; Robert Marnelius

    2002-03-12

    We propose a new BRST-like quantization procedure which is applicable to dynamical systems containing both first and second class constraints. It requires no explicit separation into first and second class constraints and therefore no conversion of second class constraints is needed. The basic ingredient is instead an invariant projection operator which projects out the maximal subset of constraints in involution. The hope is that the method will enable a covariant quantization of models for which there is no covariant separation into first and second class constraints. An example of this type is given.

  8. Selecta from a Life-Long Obsession with Path Integrals

    SciTech Connect (OSTI)

    Klauder, John R.

    2008-06-18

    The definition and interpretation of canonical, phase space path integrals has evolved over many years to achieve a form that now admits a correct and rigorous formulation, which is also covariant under canonical coordinate transformations. Such formulations involve coherent state representations, which, in their modern version, were originally introduced as an alternative tool to construct phase space path integrals. Moreover, coherent state representations lead to physical interpretations that are more natural than those afforded by more traditional representations. Suitable continuous time regularization procedures lead to a covariant phase space path integral formulation that greatly clarifies the vague phrase that canonical quantization requires Cartesian coordinates.

  9. Jet Spaces in Modern Hamiltonian Biomechanics

    E-Print Network [OSTI]

    Ivancevic, Tijana T; Stankovic, Ratko; Markovic, Sasa

    2009-01-01

    In this paper we propose the time-dependent Hamiltonian form of human biomechanics, as a sequel to our previous work in time-dependent Lagrangian biomechanics [1]. Starting with the Covariant Force Law, we first develop autonomous Hamiltonian biomechanics. Then we extend it using a powerful geometrical machinery consisting of fibre bundles and jet manifolds associated to the biomechanical configuration manifold. We derive time-dependent, dissipative, Hamiltonian equations and the fitness evolution equation for the general time-dependent human biomechanical system. Keywords: Human biomechanics, covariant force law, configuration manifold, jet manifolds, time-dependent Hamiltonian dynamics

  10. Isospin transfer modes in exotic nuclei

    E-Print Network [OSTI]

    Elena Litvinova

    2014-10-20

    This work presents an approach to nuclear spin-isospin response, which is capable of describing the overall strength distribution up to high excitation energies, including the fine structure of the low-lying strength, and resolving the long-standing quenching problem. The model is a covariant realization of the nuclear field theory and based on the self-consistent extensions of the covariant energy density functional (CEDF) theory. Results of the recent calculations for spin-isospin response of ordinary and exotic medium-mass nuclei are presented and discussed.

  11. Remark on the Consistent Gauge Anomaly in Supersymmetric Theories

    E-Print Network [OSTI]

    Ohshima, Y; Suzuki, H; Yasuta, H; Ohshima, Yoshihisa; Okuyama, Kiyoshi; Suzuki, Hiroshi; Yasuta, Hirofumi

    1999-01-01

    We present a direct field theoretical calculation of the consistent gauge anomaly in the superfield formalism, on the basis of a definition of the effective action through the covariant gauge current. The scheme is conceptually and technically simple and the gauge covariance in intermediate steps reduces calculational labors considerably. The resultant superfield anomaly, being proportional to the anomaly $d^{abc}=\\tr T^a\\{T^b,T^c\\}$, is minimal even without supplementing any counterterms. Our anomaly coincides with the anomaly obtained by Marinkovi\\'c as the solution of the Wess-Zumino consistency condition.

  12. Understanding and parameterizing the soilwater atmosphere transfer through vegetation

    E-Print Network [OSTI]

    ecosystem exchange of latent energy and CO2 via eddy covariance are increasingly common. These measurements as the transpiration stream and is essentially a hydraulic flow through porous media. The driving force for this flow is the difference in water potential between the two ends of a chain of hydraulic resistances, in a manner which

  13. Noise sequences of infinite matrices and their applications to the characterization of the canonical phase and box localization observables

    E-Print Network [OSTI]

    Pekka Lahti; Maciej J. Maczynski; Egon Scheffold; Kari Ylinen

    2006-01-23

    Noise sequences of infinite matrices associated with covariant phase and box localization observables are defined and determined. The canonical observables are characterized within the relevant classes of observables as those with asymptotically minimal or minimal noise, i.e., the noise tending to 0 or having the value 0.

  14. Simulation of stationary Gaussian noise with regard to the Langevin equation with memory effect

    E-Print Network [OSTI]

    Julian Schmidt; Alex Meistrenko; Hendrik van Hees; Carsten Greiner

    2015-11-06

    We present an efficient method for simulating a stationary Gaussian noise with an arbitrary covariance function and then study numerically the impact of time-correlated noise on the time evolution of a 1 + 1 dimensional generalized Langevin equation by comparing also to analytical results. Finally, we apply our method to the generalized Langevin equation with an external harmonic and double-well potential.

  15. Statistical Analysis of Semiparametric Models in Accelerated Life Testing

    E-Print Network [OSTI]

    : Accelerated life models, additive accumulation of damages, generalized proportional hazards, semiparametric­to­failure of items under the stress x(\\Delta) is deøned by a non­negative absolutely continuous random variable T x models with random covariates. The proportion F x(\\Delta) (t) of items from\\Omega which fail until

  16. Characterization of bipartite states using a single homodyne detector

    E-Print Network [OSTI]

    Virginia D'Auria; Alberto Porzio; Salvatore Solimeno; Stefano Olivares; Matteo G. A. Paris

    2005-09-26

    We suggest a scheme to reconstruct the covariance matrix of a two-mode state using a single homodyne detector plus a polarizing beam splitter and a polarization rotator. It can be used to fully characterize bipartite Gaussian states and to extract relevant informations on generic states.

  17. Distribution to Distribution Regression Junier B. Oliva joliva@cs.cmu.edu

    E-Print Network [OSTI]

    Schneider, Jeff

    Distribution to Distribution Regression Junier B. Oliva joliva@cs.cmu.edu Barnab´as P `Distribution to Distribution re- gression' where one is regressing a mapping where both the covariate (inputs) and re- sponse (outputs) are distributions. No pa- rameters on the input or output distributions

  18. Moment Based Dimension Reduction for Multivariate Response Regression

    E-Print Network [OSTI]

    Bura, Efstathia

    Moment Based Dimension Reduction for Multivariate Response Regression Xiangrong Yin Efstathia Bura January 20, 2005 Abstract Dimension reduction aims to reduce the complexity of a regression without re- quiring a pre-specified model. In the case of multivariate response regressions, covariance

  19. An Efficient Algorithm for REML in Heteroscedastic Regression

    E-Print Network [OSTI]

    Smyth, Gordon K.

    An Efficient Algorithm for REML in Heteroscedastic Regression Gordon K. Smyth Walter and Eliza Hall of covariates relevant for predicting the variance and and are vectors of regression coefficients. The model). Heteroscedastic regression models have an extensive literature going back to Park (1966), Rutemiller & Bowers

  20. The Analysis of Dimensionality Reduction Techniques in Cryptographic Object Code Classification

    SciTech Connect (OSTI)

    Jason L. Wright; Milos Manic

    2010-05-01

    This paper compares the application of three different dimension reduction techniques to the problem of locating cryptography in compiled object code. A simple classi?er is used to compare dimension reduction via sorted covariance, principal component analysis, and correlation-based feature subset selection. The analysis concentrates on the classi?cation accuracy as the number of dimensions is increased.

  1. On the Vacuum Propagation of Gravitational Waves

    E-Print Network [OSTI]

    Xiao Liu

    2007-06-05

    We show that, for any local, causal quantum field theory which couples covariantly to gravity, and which admits Minkowski spacetime vacuum(a) invariant under the inhomogeneous proper orthochronous Lorentz group, plane gravitational waves propagating in such Minkowski vacuum(a) do not dissipate energy or momentum via quantum field theoretic effects.

  2. Best Linear Unbiased Estimate Motivation for BLUE

    E-Print Network [OSTI]

    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

  3. Discrete Scale Relativity

    E-Print Network [OSTI]

    R. L. Oldershaw

    2007-12-19

    The possibility that global discrete dilation invariance is a fundamental symmetry principle of nature is explored. If the discrete self-similarity observed in nature is exact, then the Principle of General Covariance needs to be broadened in order to accommodate this form of discrete conformal invariance, and a further generalization of relativity theory is required.

  4. Does three dimensional electromagnetic field inherit the spacetime symmetries?

    E-Print Network [OSTI]

    Cvitan, Maro; Smoli?, Ivica

    2015-01-01

    We prove that the electromagnetic field in a (1+2)-dimensional spacetime necessarily inherits the symmetries of the spacetime metric in a large class of generalized Einstein-Maxwell theories. The Lagrangians of the studied theories have general diff-covariant gravitational part and include both the gravitational and the gauge Chern-Simons terms.

  5. Buoyancy flux, turbulence, and the gas transfer coefficient in a stratified lake

    E-Print Network [OSTI]

    California at Santa Barbara, University of

    covariance estimates of k600 compare well with predictions of k600 using a surface renewal model based, is associated with a positive b, and is not considered in windbased models. The surface renewal model, which can the importance of lakes in carbon budgets [Cole et al., 2007], the surface renewal model has rarely been applied

  6. A unifying mechanical equation with applications to non-holonomic constraints and dissipative phenomena

    E-Print Network [OSTI]

    E. Minguzzi

    2014-10-01

    A mechanical covariant equation is introduced which retains all the effectingness of the Lagrange equation while being able to describe in a unified way other phenomena including friction, non-holonomic constraints and energy radiation (Lorentz-Abraham-Dirac force equation). A quantization rule adapted to the dissipative degrees of freedom is proposed which does not pass through the variational formulation.

  7. Gaussian Process Regression with Mismatched Models

    E-Print Network [OSTI]

    Sollich, Peter

    be partic­ ularly dangerous: For example, a student with a standard radial basis function covariance by simulations. 1 Introduction There has in the last few years been a good deal of excitement about the use examples n. Good bounds and approximations for ffl(n) are now available [1, 2, 3, 4, 5

  8. Neural Networks 1 Running Head: NETWORKS AND SPEED-ACCURACY TRADEOFF

    E-Print Network [OSTI]

    Neural Networks 1 Running Head: NETWORKS AND SPEED-ACCURACY TRADEOFF Neural Networks Associated@columbia.edu (Y. Stern) #12;Neural Networks 2 Abstract This functional neuroimaging (fMRI) study examined the neural networks (spatial patterns of covarying neural activity) associated with the speed

  9. Sensitivity Study of a Semi-automatic Supervised Classifier Applied to Minerals from X-Ray Mapping Images

    E-Print Network [OSTI]

    Lyngby, Denmark aa@imm.dtu.dk Harald Flesche Norsk Hydro Research Centre N-5020 Bergen, Norway Harald.Flesche@nho.hydro to a small area in order to allow for the estimation of a variance-covariance matrix. This expansion is presently used as a routine petrographi- cal analysis method at Norsk Hydro Research Cen- tre. 1

  10. Orientation statistics at fixation D Ganguli, J Freeman, U Rajashekar, and E P Simoncelli

    E-Print Network [OSTI]

    Rajashekar, Umesh

    Orientation statistics at fixation D Ganguli, J Freeman, U Rajashekar, and E P Simoncelli Presented statistics via the "orientation tensor" (Granlund & Knutsson, 1994), computed as the 2x2 covariance matrix be converted into three natural parameters: energy, orientedness, and orientation. Energy is the total variance

  11. Net ecosystem methane and carbon dioxide exchanges in a Lake Erie coastal marsh

    E-Print Network [OSTI]

    Chen, Jiquan

    Net ecosystem methane and carbon dioxide exchanges in a Lake Erie coastal marsh and a nearby ecosystem carbon dioxide (FCO2) and methane (FCH4) exchanges were measured by using the eddy covariance ) at the cropland. At the seasonal scale, soil temperature associated with methane (CH4) production provided

  12. Variate Generation for the Accelerated Life and Proportional Hazards Models

    E-Print Network [OSTI]

    Leemis, Larry

    Variate Generation for the Accelerated Life and Proportional Hazards Models Lawrence M. Leemis by a factor (z), variates are generated by t = H-1 0 (- log(u)) (z) . In the proportional hazards model The accelerated life and proportional hazards lifetime models are used to account for the effects of covariates

  13. RN/96/125 Revision : 1.4 Evolution of Genetic Programming Populations

    E-Print Network [OSTI]

    Fernandez, Thomas

    show Price's Covariance and Selection Theorem can be applied to Genetic Algorithms (GAs) and GP of Natural Selection and shows in its normal interpretation it does not apply to practical GAs. An analysis, Fax: +44 (0) 171 387 1397 Keywords: population variety, diversity, genetic programming, Price

  14. Evolution of Genetic Programming Populations W. B. Langdon

    E-Print Network [OSTI]

    Fernandez, Thomas

    Keywords: population variety, diversity, genetic programming, Price's theorem, Fisher's theorem. Abstract 1 by briefly describing the stack experiment [ Langdon, 1995 ] . In Section 2 we show Price's Covariance and Selection Theorem can be applied to Genetic Algorithms (GAs) and GP to predict changes in gene

  15. Colourful male guppies produce faster and more viable sperm L. LOCATELLO,* M. B. RASOTTO,*, J. P. EVANS & A. PILASTRO*

    E-Print Network [OSTI]

    Pilastro, Andrea

    ). Guppies are live-bearing, sexually dimorphic fish with internal fertil- ization and a polyandrous studies have reported no significant association between male ornaments and sperm traits (birds: Birkhead sexually selected characteristics positively covaries with ejaculate traits (see also Malo et al., 2005b

  16. Nondimensional Simplification of Tensor Polynomials with Indices

    E-Print Network [OSTI]

    X. Jaen; A. Balfagon

    1999-12-15

    We are presenting an algorithm capable of simplifying tensor polynomials with indices when the building tensors have index symmetry properties. These properties include simple symmetry, cyclicity and those due to the presence of covariant derivatives. The algorithm is part of a Mathematica package called Tools of Tensor Calculus (TTC) [web address: http://baldufa.upc.es/ttc

  17. ON THE CONTINUITY OF ORNSTEIN-UHLENBECK PROCESSES IN

    E-Print Network [OSTI]

    Millet, Annie

    ON THE CONTINUITY OF ORNSTEIN-UHLENBECK PROCESSES IN INFINITE DIMENSIONS A. MILLET 1 W. SMOLE´NSKI 2 ABSTRACT : Existence and continuity of Ornstein-Uhlenbeck processes in Banach and Hilbert spaces and the continuity of a B-valued Gaussian process (Xt) with covariance given by E[ f (Xs) g (Xt) ] = st 0

  18. PROBLEMS IN BROWNIAN MOTION 1. Gaussian processes -necessary conditions for continuous version. Let

    E-Print Network [OSTI]

    Krishnapur, Manjunath

    1 PROBLEMS IN BROWNIAN MOTION 1. Gaussian processes - necessary conditions for continuous version[(Xt -m(t))(Xs -m(s))]. We say that X is a continuous Gaussian process or an L2 Gaussian process etc Gaussian process with mean m and covariance K, then m and K are continuous functions on I and I2

  19. Siegel's formula via Stein's identities Department of Statistics

    E-Print Network [OSTI]

    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

  20. Oak Openings and Conservation EEES 4750: Conservation Biology

    E-Print Network [OSTI]

    Gottgens, Hans

    -2 -3 Biweek Mean NEP (Mg C/ha) 0 2 -2 -4 -6 Cumulativ e NEP (Mg C/ha) 2004 2005 2006 2007 2008 2009 (a) Cumulative NEP (b) Mean NEP Bi-Weekly changes in NEP based on eddy-covariance tower data from

  1. Global Optimization of GPS Augmentation Architectures using Genetic Algorithms

    E-Print Network [OSTI]

    Neumaier, Arnold

    and robust control design along with studies of DGPS performance. Per Enge is a Research Professor conditions and integrity in the case of system failures. Methods that combine covariance propagation for spacecraft, ionosphere, and ground errors. Updated results are given for the FAA testbed (NSTB) network

  2. Wind Farm Diversification and Its Impact on Power System Reliability 

    E-Print Network [OSTI]

    Degeilh, Yannick

    2010-10-12

    enhancement of wind power output predictability is in itself desirable, as it would permit the accurate design of thermal conventional units dedicated only to the compensation of wind power erratic behavior. The turbines used in the studies are 3 MW Vestas...M the covariance matrix of the statistical single wind turbine power outputs ?? (i designating the farm number): 19...

  3. Time Crystals from Minimum Time Uncertainty

    E-Print Network [OSTI]

    Mir Faizal; Mohammed M. Khalil; Saurya Das

    2014-12-29

    Motivated by the Generalized Uncertainty Principle, covariance, and a minimum measurable time, we propose a deformation of the Heisenberg algebra, and show that this leads to corrections to all quantum mechanical systems. We also demonstrate that such a deformation implies a discrete spectrum for time. In other words, time behaves like a crystal.

  4. Full-Duplex Bidirectional MIMO: Achievable Rates under Limited Dynamic Range Brian P. Day

    E-Print Network [OSTI]

    Schniter, Philip

    the incoming signal. modemA modemB Typically, this self-interference can be 100dB. Now, consider a typical ADC of channel estimation error, transmitter/receiver distortion. For example, we have ++ + ^H22 ^H22 ^H21 Optimization We wish to maximize the sum-rate by finding optimal transmit covariance matrices under a time

  5. A 2-step Empirical Likelihood approach for combining sample and population data in regression estimation

    E-Print Network [OSTI]

    Chaudhuri, Sanjay

    with the dependent variables are known from the population level data, obtained as for example from census then be obtained by maximizing the likelihood function under the population level constraints. The method can covariates is modeled using a combination of sample data from the Panel Study of Income Dynamics (PSID, Hill

  6. Western Society of Weed Science, Albuquerque, New Mexico. March 10-12, 2009. Skurski TC, Maxwell, BD, and Rew LJ

    E-Print Network [OSTI]

    Maxwell, Bruce D.

    significant environmental correlates with NIS impact and response to treatment will help guide weed management Community and Environmental Covariates of Non-Indigenous Plant Impacts Tanya C. Skurski, Lisa J. Rew, Bruce. If a significant relationship exists between environmental variables or biotic conditions and impact, knowledge

  7. Agricultural and Forest Meteorology 115 (2003) 91107 Post-fire carbon dioxide fluxes in the western Canadian boreal

    E-Print Network [OSTI]

    Nassar, Ray

    2003-01-01

    Agricultural and Forest Meteorology 115 (2003) 91­107 Post-fire carbon dioxide fluxes in the western Canadian boreal forest: evidence from towers, aircraft and remote sensing Brian D. Amiroa,, J. Ian ecosystem exchange by eddy covariance) and remote sens- ing/modeling (net primary productivity

  8. Photonic portal to hidden sector and a parity-preserving option

    E-Print Network [OSTI]

    Wojciech Krolikowski

    2010-01-25

    In the case of previously proposed idea of photonic portal to hidden sector, the parity in this sector may be violated. We discuss here two new options within our model, where the parity is preserved. The first of them is not satisfactory, as not diplaying a full relativistic covariance. The second seems to be satisfactory.

  9. Model Validation and Spatial Interpolation by Combining Observations with Outputs from Numerical

    E-Print Network [OSTI]

    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

  10. Atmospheric Environment 38 (2004) 44274436 Statistical comparison of observed and CMAQ modeled daily

    E-Print Network [OSTI]

    Jun, Mikyoung

    2004-01-01

    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

  11. Waves and the equilibrium range at Ocean Weather Station P J. Thomson,1

    E-Print Network [OSTI]

    September 2013; accepted 29 September 2013; published 8 November 2013. [1] Wave and wind measurements energy spectra. Observations are consistent with a local balance between wind input and breaking dissipation, as described by Philips (1985). The measurements include direct covariance wind stress estimates

  12. Global relationship of wood and leaf litter decomposability: the role of

    E-Print Network [OSTI]

    Thomas, David D.

    META ANALYSIS Global relationship of wood and leaf litter decomposability: the role of functional and their phylogenetic history influence decay rates of dead wood and leaf litter, but it remains unknown if decay rates of wood and litter covary over a wide range of tree species and across ecosystems. We evaluated

  13. Influence of the Eurasian snow cover on the Indian summer monsoon variability in observed climatologies and CMIP3

    E-Print Network [OSTI]

    Influence of the Eurasian snow cover on the Indian summer monsoon variability in observed of the winter/spring Eurasian snow cover on the subsequent Indian summer precipitation using sev- eral statistical tools including a maximum covariance analysis. The snow­monsoon relationship is explored using

  14. Influence of the Eurasian snow cover on the Indian summer monsoon variability in observed climatologies and CMIP3

    E-Print Network [OSTI]

    Influence of the Eurasian snow cover on the Indian summer monsoon variability in observed the possible influence of the winter/spring Eurasian snow cover on the subsequent Indian summer precipitation using sev- eral statistical tools including a maximum covariance analysis. The snow­monsoon relationship

  15. 1404 VOLUME 16J O U R N A L O F C L I M A T E 2003 American Meteorological Society

    E-Print Network [OSTI]

    Xie, Shang-Ping

    of Sea Surface Temperature and Wind over the Kuroshio and Its Extension: Evidence for Ocean leaves the coast in the offshore path. The positive SST­wind correlation over the strong Kuroshio Current are analyzed, revealing robust covariability in sea surface temperature (SST) and wind speed over the Kuroshio

  16. On the spatial structure of coastal circulation off Newport, Oregon, during spring and summer 2001 in a region of varying shelf width

    E-Print Network [OSTI]

    Kurapov, Alexander

    covaries with the meridional wind and the primary mode of ocean current response. Citation: Kosro, P. M in a region of varying shelf width P. Michael Kosro College of Oceanic and Atmospheric Sciences, Oregon State Advances in Shelf Transport (COAST). The surface currents responded rapidly to the changing winds

  17. Visions for Data Management and Remote Collaboration on ITER

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    I P 0.9 MA P IN 2.3 MW H98 1.3 M. Greenwald, et al., APS-DPP November 2007 C-Mod Data Helps Break Covariance Between EFF and nn G Makes Extrapolation To ITER More...

  18. The Annals of Applied Statistics 2009, Vol. 3, No. 2, 595610

    E-Print Network [OSTI]

    Boehning, Dankmar

    estimator by means of logistic regression to include observed heterogeneity in the form of covariates. We files can be used to generate a list of individuals from some population of interest. If each time of a population using an incomplete list. Consider a population of size N and a count variable Y taking values

  19. On Discriminative Joint Density Modeling Jarkko Salojarvi1

    E-Print Network [OSTI]

    Kaski, Samuel

    missing values, since the model is #12;assumed to generate also the covariates x. The models are often- criminative cost function, the conditional likelihood. We use the frame- work to derive generative models for generalized linear models, including logistic regression, linear discriminant analysis, and discriminative mix

  20. Meta-Analysis of Rare Events A One-day Course

    E-Print Network [OSTI]

    Boehning, Dankmar

    :, covariance(independent) binomial(xsum) o (9 missing values generated) . gen offset=log(cadayst/cadaysc) (9 missing values generated) . gen xsum=xt+xc #12;3 ceasarean12: here problems of convergence occur due of groups = 9 Binomial variable: xsum Mixed-effects logistic regression Number of obs = 9 Iteration 2: log