Manifestly Covariant Relativity
Kenneth Dalton
2006-08-03T23:59:59.000Z
According to Einstein's principle of general covariance, all laws of nature are to be expressed by manifestly covariant equations. In recent work, the covariant law of energy-momentum conservation has been established. Here, we show that this law gives rise to a fully covariant theory of gravitation and that Einstein's field equations yield total energy-momentum conservation.
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (MillionStructural Basis of WntSupportB 18B()The FiveRevisedThe vision of aTheos J. Thompson, 1964
Wang, Z. Jane
The Laboratory of Atomic & Solid State Physics (LASSP) at Cor nell University expects to make a faculty appointment in theo re cal physics, to begin on July 1, 2015. We encourage applica ons focused on theore cal studies of atomic physics, bio physics, condensed ma er physics, sta s cal
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
Receding Horizon Covariance Control
Wendel, Eric
2012-10-19T23:59:59.000Z
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...
Covariant Noncommutative Field Theory
Estrada-Jimenez, S. [Licenciaturas en Fisica y en Matematicas, Facultad de Ingenieria, Universidad Autonoma de Chiapas Calle 4a Ote. Nte. 1428, Tuxtla Gutierrez, Chiapas (Mexico); Garcia-Compean, H. [Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del IPN P.O. Box 14-740, 07000 Mexico D.F., Mexico and Centro de Investigacion y de Estudios Avanzados del IPN, Unidad Monterrey Via del Conocimiento 201, Parque de Investigacion e Innovacion Tecnologica (PIIT) Autopista nueva al Aeropuerto km 9.5, Lote 1, Manzana 29, cp. 66600 Apodaca Nuevo Leon (Mexico); Obregon, O. [Instituto de Fisica de la Universidad de Guanajuato P.O. Box E-143, 37150 Leon Gto. (Mexico); Ramirez, C. [Facultad de Ciencias Fisico Matematicas, Universidad Autonoma de Puebla, P.O. Box 1364, 72000 Puebla (Mexico)
2008-07-02T23:59:59.000Z
The covariant approach to noncommutative field and gauge theories is revisited. In the process the formalism is applied to field theories invariant under diffeomorphisms. Local differentiable forms are defined in this context. The lagrangian and hamiltonian formalism is consistently introduced.
Covariant Hamiltonian Field Theory
Jürgen Struckmeier; Andreas Redelbach
2012-05-22T23:59:59.000Z
A consistent, local coordinate formulation of covariant Hamiltonian field theory is presented. Whereas the covariant canonical field equations are equivalent to the Euler-Lagrange field equations, the covariant canonical transformation theory offers more general means for defining mappings that preserve the form of the field equations than the usual Lagrangian description. It is proved that Poisson brackets, Lagrange brackets, and canonical 2-forms exist that are invariant under canonical transformations of the fields. The technique to derive transformation rules for the fields from generating functions is demonstrated by means of various examples. In particular, it is shown that the infinitesimal canonical transformation furnishes the most general form of Noether's theorem. We furthermore specify the generating function of an infinitesimal space-time step that conforms to the field equations.
Backe, Knut
process of oilwell cement slurries. The theo- retical relationship among conductivity, porosity, cement and that rapid hydration will reduce the risk of gas migration. Introduction The main purposes of oilwell cements hardening process of oilwell cement slurries is important for successful cementing operations. Several
Covariance evaluation work at LANL
Kawano, Toshihiko [Los Alamos National Laboratory; Talou, Patrick [Los Alamos National Laboratory; Young, Phillip [Los Alamos National Laboratory; Hale, Gerald [Los Alamos National Laboratory; Chadwick, M B [Los Alamos National Laboratory; Little, R C [Los Alamos National Laboratory
2008-01-01T23:59:59.000Z
Los Alamos evaluates covariances for nuclear data library, mainly for actinides above the resonance regions and light elements in the enUre energy range. We also develop techniques to evaluate the covariance data, like Bayesian and least-squares fitting methods, which are important to explore the uncertainty information on different types of physical quantities such as elastic scattering angular distribution, or prompt neutron fission spectra. This paper summarizes our current activities of the covariance evaluation work at LANL, including the actinide and light element data mainly for the criticality safety study and transmutation technology. The Bayesian method based on the Kalman filter technique, which combines uncertainties in the theoretical model and experimental data, is discussed.
Covariant Geometric Prequantization of Fields
Kanatchikov, I V
2002-01-01T23:59:59.000Z
A geometric prequantization formula for the Poisson-Gerstenhaber bracket on forms found within the DeDonder-Weyl Hamiltonian formalism earlier is presented. The related aspects of covariant geometric quantization of field theories are sketched. In particular, the importance of the framework of Clifford and spinor bundles and superconnections in this context is underlined.
Covariant Geometric Prequantization of Fields
I. V. Kanatchikov
2001-01-04T23:59:59.000Z
A geometric prequantization formula for the Poisson-Gerstenhaber bracket of forms found within the DeDonder-Weyl Hamiltonian formalism earlier is presented. The related aspects of covariant geometric quantization of field theories are sketched. In particular, the importance of the framework of Clifford and spinor bundles and superconnections in this context is underlined.
GENERATION OF PRESCRIBED NONSTATIONARY COVARIANCES
Moore, John Barratt
by white noise, and the covariance of the output of the system. More precisely, systems of the form ; = F(t)x This paper is concerned with establishing connections between the matrices describing a system excited#'be interested in simulating R (t,T) for t, T `tO using a system (l); then it is necessary to }s ecify not merely
Noncommutative electrodynamics with covariant coordinates
Zahn, Jochen [II. Institut fuer Theoretische Physik, Universitaet Hamburg, Luruper Chausse 149, 22761 Hamburg (Germany)
2004-11-15T23:59:59.000Z
We study noncommutative electrodynamics using the concept of covariant coordinates. We propose a scheme for interpreting the formalism and construct two basic examples, a constant field and a plane wave. Superposing these two, we find a modification of the dispersion relation. Our results differ from those obtained via the Seiberg-Witten map.
Covariance Evaluation Methodology for Neutron Cross Sections
Herman,M.; Arcilla, R.; Mattoon, C.M.; Mughabghab, S.F.; Oblozinsky, P.; Pigni, M.; Pritychenko, b.; Songzoni, A.A.
2008-09-01T23:59:59.000Z
We present the NNDC-BNL methodology for estimating neutron cross section covariances in thermal, resolved resonance, unresolved resonance and fast neutron regions. The three key elements of the methodology are Atlas of Neutron Resonances, nuclear reaction code EMPIRE, and the Bayesian code implementing Kalman filter concept. The covariance data processing, visualization and distribution capabilities are integral components of the NNDC methodology. We illustrate its application on examples including relatively detailed evaluation of covariances for two individual nuclei and massive production of simple covariance estimates for 307 materials. Certain peculiarities regarding evaluation of covariances for resolved resonances and the consistency between resonance parameter uncertainties and thermal cross section uncertainties are also discussed.
Alpay, S. Pamir
and M. C. Flemings, "Influence of Coarsening on Dendrite Arm Spacing of Aluminum-Copper Alloys", Trans of Copper in a High Strength Aluminum Alloy (KO-1)", Scripta Met., Vol. 6, 1972, p. 101. 19. G. W of a High Strength Aluminum Alloy (KO-1)", Met. Trans., Vol. 4, 1973, p. 1069. 27. J. N. Lanzafame and T. Z
Theo Cateforis Curriculum Vitae
McConnell, Terry
Musicology 87 (Spring 2009): 161-90. "Sources and Storytelling: Teaching the History of Rock Through its Primary Documents." Journal of Popular Music Studies 21, no. 1 (2009): 20-58. "Performing the Avant: Transformations in Popular Music Culture. Notes: Journal of the Music Library Association 59, no. 3 (2003): 616
Visualizing Distributions of Covariance Matrices Tomoki Tokudaa
Gelman, Andrew
Background Covariance matrices and their corresponding distributions play an important role in statis- tics of Education Science grant #ED-GRANTS-032309-005, Institute of Education Science grant #R305D090006-09A
Noncommutative Gauge Theory with Covariant Star Product
Zet, G. [Physics Department, 'Gh. Asachi' Technical University, 700050 Iasi (Romania)
2010-08-04T23:59:59.000Z
We present a noncommutative gauge theory with covariant star product on a space-time with torsion. In order to obtain the covariant star product one imposes some restrictions on the connection of the space-time. Then, a noncommutative gauge theory is developed applying this product to the case of differential forms. Some comments on the advantages of using a space-time with torsion to describe the gravitational field are also given.
Covariant Quantum Green's Function for an Accelerated Particle
T. Garavaglia
2001-04-03T23:59:59.000Z
Covariant relativistic quantum theory is used to study the covariant Green's function, which can be used to determine the proper time evolved wave functions that are solutions to the covariant Schr\\"odinger type equation for a massive spin zero particle. The concept of covariant action is used to obtain the Green's function for an accelerated relativistic particle.
Progress on Nuclear Data Covariances: AFCI-1.2 Covariance Library
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
2009-09-28T23:59:59.000Z
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.
Covariant Lyapunov vectors for rigid disk systems
Hadrien Bosetti; Harald A. Posch
2010-06-30T23:59:59.000Z
We carry out extensive computer simulations to study the Lyapunov instability of a two-dimensional hard disk system in a rectangular box with periodic boundary conditions. The system is large enough to allow the formation of Lyapunov modes parallel to the x axis of the box. The Oseledec splitting into covariant subspaces of the tangent space is considered by computing the full set of covariant perturbation vectors co-moving with the flow in tangent-space. These vectors are shown to be transversal, but generally not orthogonal to each other. Only the angle between covariant vectors associated with immediate adjacent Lyapunov exponents in the Lyapunov spectrum may become small, but the probability of this angle to vanish approaches zero. The stable and unstable manifolds are transverse to each other and the system is hyperbolic.
General Covariance in Algebraic Quantum Field Theory
Romeo Brunetti; Martin Porrmann; Giuseppe Ruzzi
2005-12-17T23:59:59.000Z
In this review we report on how the problem of general covariance is treated within the algebraic approach to quantum field theory by use of concepts from category theory. Some new results on net cohomology and superselection structure attained in this framework are included.
Operator ordering for generally covariant systems
Rafael Ferraro; Daniel M. Sforza
2000-10-06T23:59:59.000Z
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.
Covariant Lyapunov Analysis of NavierStokes Turbulence
RIMSÂ1770 Covariant Lyapunov Analysis of NavierÂStokes Turbulence By Masanobu INUBUSHI January 2013 RESEARCH INSTITUTE FOR MATHEMATICAL SCIENCES KYOTO UNIVERSITY, Kyoto, Japan #12; Covariant Lyapunov of the important properties of chaos. Particularly, we employ covariant Lyapunov analysis recently developed
Covariant Lyapunov Analysis of Navier-Stokes Turbulence
RIMS-1770 Covariant Lyapunov Analysis of Navier-Stokes Turbulence By Masanobu INUBUSHI January 2013 RESEARCH INSTITUTE FOR MATHEMATICAL SCIENCES KYOTO UNIVERSITY, Kyoto, Japan #12;Covariant Lyapunov Analysis of chaos. Particularly, we employ covariant Lyapunov analysis recently developed by Ginelli et al. (2007
A Superdimensional Dual-covariant Field Theory
Yaroslav Derbenev
2015-08-12T23:59:59.000Z
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.
Nuclear fission in covariant density functional theory
A. V. Afanasjev; H. Abusara; P. Ring
2013-09-12T23:59:59.000Z
The current status of the application of covariant density functional theory to microscopic description of nuclear fission with main emphasis on superheavy nuclei (SHN) is reviewed. The softness of SHN in the triaxial plane leads to an emergence of several competing fission pathes in the region of the inner fission barrier in some of these nuclei. The outer fission barriers of SHN are considerably affected both by triaxiality and octupole deformation.
Twisted covariant noncommutative self-dual gravity
Estrada-Jimenez, S.; Garcia-Compean, H.; Obregon, O.; Ramirez, C. [Centro de Estudios en Fisica y Matematicas Basicas y Aplicadas, Universidad Autonoma de Chiapas, Calle 4 Oriente Norte 1428, Tuxtla Gutierrez, Chiapas (Mexico); Departamento de Fisica, Centro de Investigacion y de Estudios Avanzados del IPN, P.O. Box 14-740, 07000 Mexico D.F. (Mexico); Centro de Investigacion y de Estudios Avanzados del IPN, Unidad Monterrey, PIIT, Via del Conocimiento 201, Autopista nueva al Aeropuerto km 9.5, 66600, Apodaca Nuevo Leon (Mexico); Instituto de Fisica de la Universidad de Guanajuato, P.O. Box E-143, 37150, Leon Gto. (Mexico); Facultad de Ciencias Fisico Matematicas, Universidad Autonoma de Puebla, P.O. Box 1364, 72000, Puebla (Mexico)
2008-12-15T23:59:59.000Z
A twisted covariant formulation of noncommutative self-dual gravity is presented. The formulation for constructing twisted noncommutative Yang-Mills theories is used. It is shown that the noncommutative torsion is solved at any order of the {theta} expansion in terms of the tetrad and some extra fields of the theory. In the process the first order expansion in {theta} for the Plebanski action is explicitly obtained.
Development of covariance capabilities in EMPIRE code
Herman,M.; Pigni, M.T.; Oblozinsky, P.; Mughabghab, S.F.; Mattoon, C.M.; Capote, R.; Cho, Young-Sik; Trkov, A.
2008-06-24T23:59:59.000Z
The nuclear reaction code EMPIRE has been extended to provide evaluation capabilities for neutron cross section covariances in the thermal, resolved resonance, unresolved resonance and fast neutron regions. The Atlas of Neutron Resonances by Mughabghab is used as a primary source of information on uncertainties at low energies. Care is taken to ensure consistency among the resonance parameter uncertainties and those for thermal cross sections. The resulting resonance parameter covariances are formatted in the ENDF-6 File 32. In the fast neutron range our methodology is based on model calculations with the code EMPIRE combined with experimental data through several available approaches. The model-based covariances can be obtained using deterministic (Kalman) or stochastic (Monte Carlo) propagation of model parameter uncertainties. We show that these two procedures yield comparable results. The Kalman filter and/or the generalized least square fitting procedures are employed to incorporate experimental information. We compare the two approaches analyzing results for the major reaction channels on {sup 89}Y. We also discuss a long-standing issue of unreasonably low uncertainties and link it to the rigidity of the model.
Development of Covariance Capabilities in EMPIRE Code
Herman, M. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)], E-mail: mwherman@bnl.gov; Pigni, M.T.; Oblozinsky, P.; Mughabghab, S.F.; Mattoon, C.M. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States); Capote, R. [Nuclear Data Section, IAEA, Vienna (Austria); Cho, Young-Sik [KAERI, Daejeon (Korea, Republic of); Trkov, A. [Jozef Stefan Institute, Ljubljana (Slovenia)
2008-12-15T23:59:59.000Z
The nuclear reaction code EMPIRE has been extended to provide evaluation capabilities for neutron cross section covariances in the thermal, resolved resonance, unresolved resonance and fast neutron regions. The Atlas of Neutron Resonances by Mughabghab is used as a primary source of information on uncertainties at low energies. Care is taken to ensure consistency among the resonance parameter uncertainties and those for thermal cross sections. The resulting resonance parameter covariances are formatted in the ENDF-6 File 32. In the fast neutron range our methodology is based on model calculations with the code EMPIRE combined with experimental data through several available approaches. The model-based covariances can be obtained using deterministic (Kalman) or stochastic (Monte Carlo) propagation of model parameter uncertainties. We show that these two procedures yield comparable results. The Kalman filter and/or the generalized least square fitting procedures are employed to incorporate experimental information. We compare the two approaches analyzing results for the major reaction channels on {sup 89}Y. We also discuss a long-standing issue of unreasonably low uncertainties and link it to the rigidity of the model.
Impact of the 235U Covariance Data in Benchmark Calculations
Leal, Luiz C [ORNL] [ORNL; Mueller, Don [ORNL] [ORNL; Arbanas, Goran [ORNL] [ORNL; Wiarda, Dorothea [ORNL] [ORNL; Derrien, Herve [ORNL] [ORNL
2008-01-01T23:59:59.000Z
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.
AFCI-2.0 Library of Neutron Cross Section Covariances
Herman, M.; Herman,M.; Oblozinsky,P.; Mattoon,C.; Pigni,M.; Hoblit,S.; Mughabghab,S.F.; Sonzogni,A.; Talou,P.; Chadwick,M.B.; Hale.G.M.; Kahler,A.C.; Kawano,T.; Little,R.C.; Young,P.G.
2011-06-26T23:59:59.000Z
Neutron cross section covariance library has been under development by BNL-LANL collaborative effort over the last three years. The primary purpose of the library is to provide covariances for the Advanced Fuel Cycle Initiative (AFCI) data adjustment project, which is focusing on the needs of fast advanced burner reactors. The covariances refer to central values given in the 2006 release of the U.S. neutron evaluated library ENDF/B-VII. The preliminary version (AFCI-2.0beta) has been completed in October 2010 and made available to the users for comments. In the final 2.0 release, covariances for a few materials were updated, in particular new LANL evaluations for {sup 238,240}Pu and {sup 241}Am were adopted. BNL was responsible for covariances for structural materials and fission products, management of the library and coordination of the work, while LANL was in charge of covariances for light nuclei and for actinides.
Optimization Online - Construction of Covariance Matrices with a ...
So Yeon Chun
2008-06-13T23:59:59.000Z
Jun 13, 2008 ... Construction of Covariance Matrices with a specified Discrepancy Function Minimizer, with Application to Factor Analysis. So Yeon Chun ...
Covariant Symplectic Structure and Conserved Charges of Topologically Massive Gravity
Caner Nazaroglu; Yavuz Nutku; Bayram Tekin
2011-06-07T23:59:59.000Z
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.
Generalized score tests for missing covariate data
Jin, Lei
2009-05-15T23:59:59.000Z
consistency of ?? under H0 and (C6), A = ?A+O(n?12), JU = ?JU +Op(n12). Under the current setting, E(1? ?ipi i |yi,zi) = 1? E(?i|yi,zi)pi i = 1? piipi i = 0. (3.2) Therefore, the WEE is unbiased. Hence, E{U2(??)} = 0, and Cov{U2(??)} = (?A,Ir)JU(?A,Ir)prime +O(n... Significant Coronary Disease by Cardiac Cath 0 tvdlm Three Vessel or Left Main Disease by Cardiac Cath 3 the presence of missing covariates based under the WEE (1.1) setting. More specif- ically, we study the effects of nuisance functions pi...
A covariant treatment of cosmic parallax
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)
2014-03-01T23:59:59.000Z
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.
Kalman Filtering with Uncertain Noise Covariances Srikiran Kosanam Dan Simon
Simon, Dan
Kalman Filtering with Uncertain Noise Covariances Srikiran Kosanam Dan Simon Department.kosanam@csuohio.edu d.j.simon@csuohio.edu Abstract - In this paper the robustness of Kalman filtering against uncertainties in process and measurement noise covariances is discussed. It is shown that a standard Kalman
A representation theorem for stochastic processes with separable covariance functions,
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
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
The importance of covariance in nuclear data uncertainty propagation studies
Benstead, J. [AWE Plc, Aldermaston, Berkshire (United Kingdom)
2012-07-01T23:59:59.000Z
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)
Duality covariant multi-centre black hole systems
Guillaume Bossard; Stefanos Katmadas
2013-04-24T23:59:59.000Z
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.
Aspects of locally covariant quantum field theory
Ko Sanders
2008-09-28T23:59:59.000Z
This thesis considers various aspects of locally covariant quantum field theory (LCQFT; see Brunetti et al., Commun.Math.Phys. 237 (2003), 31-68), a mathematical framework to describe axiomatic quantum field theories in curved spacetimes. New results include: a philosophical interpretation of certain aspects of this framework in terms of modal logic; a proof that the truncated n-point functions of any Hadamard state of the free real scalar field are smooth, except for n=2; a description of he free Dirac field in a representation independent way, showing that the theory is determined entirely by the relations between the adjoint map, the charge conjugation map and the Dirac operator; a proof that the relative Cauchy evolution of the free Dirac field is related to its stress-energy-momentum tensor in the same way as for the free real scalar field (cf. loc.cit.); several results on the Reeh-Schlieder property in LCQFT, including but not limited to those of our earlier paper; a new and elegant approach to wave front sets of Banach space-valued distributions, which allows easy proofs and extensions of results in the literature.
Generalized Covariant Gyrokinetic Dynamics of Magnetoplasmas
Cremaschini, C. [Department of Astronomy, University of Trieste, Trieste (Italy); Tessarotto, M. [Department of Mathematics and Informatics, University of Trieste, Trieste (Italy); Consortium of Magneto-fluid-dynamics, University of Trieste, Trieste (Italy); Nicolini, P. [Department of Mathematics and Informatics, University of Trieste, Trieste (Italy); Beklemishev, A. [Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
2008-12-31T23:59:59.000Z
A basic prerequisite for the investigation of relativistic astrophysical magnetoplasmas, occurring typically in the vicinity of massive stellar objects (black holes, neutron stars, active galactic nuclei, etc.), is the accurate description of single-particle covariant dynamics, based on gyrokinetic theory (Beklemishev et al., 1999-2005). Provided radiation-reaction effects are negligible, this is usually based on the assumption that both the space-time metric and the EM fields (in particular the magnetic field) are suitably prescribed and are considered independent of single-particle dynamics, while allowing for the possible presence of gravitational/EM perturbations driven by plasma collective interactions which may naturally arise in such systems. The purpose of this work is the formulation of a generalized gyrokinetic theory based on the synchronous variational principle recently pointed out (Tessarotto et al., 2007) which permits to satisfy exactly the physical realizability condition for the four-velocity. The theory here developed includes the treatment of nonlinear perturbations (gravitational and/or EM) characterized locally, i.e., in the rest frame of a test particle, by short wavelength and high frequency. Basic feature of the approach is to ensure the validity of the theory both for large and vanishing parallel electric field. It is shown that the correct treatment of EM perturbations occurring in the presence of an intense background magnetic field generally implies the appearance of appropriate four-velocity corrections, which are essential for the description of single-particle gyrokinetic dynamics.
Generalized covariation and extended Fukushima decompositions for Banach valued processes.
Paris-Sud XI, Université de
Generalized covariation and extended Fukushima decompositions for Banach valued processes corresponding results when B = C([-, 0]) and X = X(·). This will consitute a significant Fukushima decomposition random variables, Malliavin calculus, Generalized Fukushima decomposition. LUISS Guido Carli - Libera
Probability, unitarity, and realism in generally covariant quantum information
S. Jay Olson; Jonathan P. Dowling
2008-02-13T23:59:59.000Z
The formalism of covariant quantum theory, introduced by Reisenberger and Rovelli, casts the description of quantum states and evolution into a framework compatable with the principles of general relativity. The leap to this covariant formalism, however, outstripped the standard interpretation used to connect quantum theory to experimental predictions, leaving the predictions of the RR theory ambiguous. Here we discuss in detail some implications of our recently proposed description of covariant quantum information (CQI), which addresses these problems. We show explicit agreement with standard quantum mechanics in the appropriate limit. In addition to compatability with general covariance, we show that our framework has other attractive and satisfying features -- it is fully unitary, realist, and self-contained. The full unitarity of the formalism in the presence of measurements allows us to invoke time-reversal symmetry to obtain new predictions closely related to the quantum Zeno effect.
Probability, unitarity, and realism from generally covariant quantum information
Olson, S Jay
2007-01-01T23:59:59.000Z
The formalism of covariant quantum theory, introduced by Reisenberger and Rovelli, casts the description of quantum states and evolution into a framework compatable with the principles of general relativity. The leap to this fully covariant formalism, however, outstripped the standard interpretation used to connect quantum theory to experimental predictions, leaving the predictions of the theory ambiguous. Here we discuss in detail some implications of our recently proposed description of covariant quantum information, which addresses these problems. We show explicit agreement with standard quantum mechanics in the appropriate limit. In addition to compatability with general covariance, we show that this framework has other attractive and surprising features -- it is fully unitary, realist, and self-contained. The full unitarity of the formalism in the presence of measurements allows us to invoke time-reversal symmetry to obtain new predictions closely related to the quantum Zeno effect.
Covariances from light-element r-martix analyses
Hale, Gerald [Los Alamos National Laboratory
2008-01-01T23:59:59.000Z
We review the method for obtaining covariance information for light-element reactions using R-matrix theory. The general LANL R-matrix analysis code EDA provides accurate covariances for the resonance parameters at a solution due to the search algorithm it uses to find a local minimum of the chi-square surface. This information is used, together with analytically calculated sensitivity derivatives, in the first-order error propagation equation to obtain cross-section covariances for all reactions included in the analysis. Examples are given of the covariances obtained from the EDA analyses for n-p scattering and for the n+{sup 6}Li reactions used in the latest light-element standard cross section evaluation. Also discussed is a method of defining 'pure theory' correlations that could be useful for extensions to higher energies and heavier systems.
AFCI-2.0 Neutron Cross Section Covariance Library
Herman, M.; Herman, M; Oblozinsky, P.; Mattoon, C.M.; Pigni, M.; Hoblit, S.; Mughabghab, S.F.; Sonzogni, A.; Talou, P.; Chadwick, M.B.; Hale, G.M.; Kahler, A.C.; Kawano, T.; Little, R.C.; Yount, P.G.
2011-03-01T23:59:59.000Z
The cross section covariance library has been under development by BNL-LANL collaborative effort over the last three years. The project builds on two covariance libraries developed earlier, with considerable input from BNL and LANL. In 2006, international effort under WPEC Subgroup 26 produced BOLNA covariance library by putting together data, often preliminary, from various sources for most important materials for nuclear reactor technology. This was followed in 2007 by collaborative effort of four US national laboratories to produce covariances, often of modest quality - hence the name low-fidelity, for virtually complete set of materials included in ENDF/B-VII.0. The present project is focusing on covariances of 4-5 major reaction channels for 110 materials of importance for power reactors. The work started under Global Nuclear Energy Partnership (GNEP) in 2008, which changed to Advanced Fuel Cycle Initiative (AFCI) in 2009. With the 2011 release the name has changed to the Covariance Multigroup Matrix for Advanced Reactor Applications (COMMARA) version 2.0. The primary purpose of the library is to provide covariances for AFCI data adjustment project, which is focusing on the needs of fast advanced burner reactors. Responsibility of BNL was defined as developing covariances for structural materials and fission products, management of the library and coordination of the work; LANL responsibility was defined as covariances for light nuclei and actinides. The COMMARA-2.0 covariance library has been developed by BNL-LANL collaboration for Advanced Fuel Cycle Initiative applications over the period of three years, 2008-2010. It contains covariances for 110 materials relevant to fast reactor R&D. The library is to be used together with the ENDF/B-VII.0 central values of the latest official release of US files of evaluated neutron cross sections. COMMARA-2.0 library contains neutron cross section covariances for 12 light nuclei (coolants and moderators), 78 structural materials and fission products, and 20 actinides. Covariances are given in 33-energy groups, from 10?5 eV to 19.6 MeV, obtained by processing with LANL processing code NJOY using 1/E flux. In addition to these 110 files, the library contains 20 files with nu-bar covariances, 3 files with covariances of prompt fission neutron spectra (238,239,240-Pu), and 2 files with mu-bar covariances (23-Na, 56-Fe). Over the period of three years several working versions of the library have been released and tested by ANL and INL reactor analysts. Useful feedback has been collected allowing gradual improvements of the library. In addition, QA system was developed to check basic properties and features of the whole library, allowing visual inspection of uncertainty and correlations plots, inspection of uncertainties of integral quantities with independent databases, and dispersion of cross sections between major evaluated libraries. The COMMARA-2.0 beta version of the library was released to ANL and INL reactor analysts in October 2010. The final version, described in the present report, was released in March 2011.
Covariant Noether Charge for Higher Dimensional Chern-Simons Terms
Tatsuo Azeyanagi; R. Loganayagam; Gim Seng Ng; Maria J. Rodriguez
2015-07-13T23:59:59.000Z
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.
Covariant Weyl quantization, symbolic calculus, and the product formula
Gunturk, Kamil Serkan
2006-08-16T23:59:59.000Z
. The Intrinsic Meaning of nabla? and Parallel Transport . 19 3. GeodesicsandCurvature ................ 22 4. MoreonGeodesicTheory................ 25 III CLASSICAL WEYL-WIGNER FORMALISM .......... 30 A.Pseudo-DifferentialOperators ................ 30 1. The... . 46 B.GeneralCase ......................... 48 1. IntrinsicWidomCalculus................ 48 2. Covariant Weyl Formalism: Fulling?s Definition .... 50 V A COVARIANT WEYL CALCULUS ............... 53 vii CHAPTER Page A...
Low-Fidelity Covariances: Neutron Cross Section Covariance Estimates for 387 Materials
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
"Covariance data are provided for radiative capture (or (n,ch.p.) for light nuclei), elastic scattering (or total for some actinides), inelastic scattering, (n,2n) reactions, fission and nubars over the energy range from 10(-5{super}) eV to 20 MeV. The library contains 387 files including almost all (383 out of 393) materials of the ENDF/B-VII.0. Absent are data for (7{super})Li, (232{super})Th, (233,235,238{super})U and (239{super})Pu as well as (223,224,225,226{super})Ra, while (nat{super})Zn is replaced by (64,66,67,68,70{super})Zn."[http://www.nndc.bnl.gov/lowfi/index.jsp?z=7
Evaluation of Covariances for Actinides and Light Elements at LANL
Kawano, T. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)], E-mail: kawano@lanl.gov; Talou, P.; Young, P.G.; Hale, G.; Chadwick, M.B.; Little, R.C. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
2008-12-15T23:59:59.000Z
Los Alamos evaluates covariances for the evaluated nuclear data library (ENDF), mainly for actinides above the resonance region and for light elements in the entire energy range. We also develop techniques to evaluate the covariance data, like Bayesian and least-squares fitting methods, which are important to explore the uncertainty information on different types of physical quantities such as elastic scattering angular distribution, or prompt neutron fission spectra. This paper summarizes our current activities of the covariance evaluation work at LANL, including the actinide and light element data mainly for criticality safety studies and transmutation technology. The Bayesian method based on the Kalman filter technique, which combines uncertainties in the theoretical model and experimental data, is discussed.
Manifestly gauge-covariant representation of scalar and fermion propagators
Latosi?ski, Adam
2015-01-01T23:59:59.000Z
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.
Addressing spectroscopic quality of covariant density functional theory
A. V. Afanasjev
2014-09-17T23:59:59.000Z
The spectroscopic quality of covariant density functional theory has been accessed by analyzing the accuracy and theoretical uncertainties in the description of spectroscopic observables. Such analysis is first presented for the energies of the single-particle states in spherical and deformed nuclei. It is also shown that the inclusion of particle-vibration coupling improves the description of the energies of predominantly single-particle states in medium and heavy-mass spherical nuclei. However, the remaining differences between theory and experiment clearly indicate missing physics and missing terms in covariant energy density functionals. The uncertainties in the predictions of the position of two-neutron drip line sensitively depend on the uncertainties in the prediction of the energies of the single-particle states. On the other hand, many spectroscopic observables in well deformed nuclei at ground state and finite spin only weakly depend on the choice of covariant energy density functional.
Walsh, Stephen J.; Tardiff, Mark F.
2007-10-17T23:59:59.000Z
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.
Neutron Cross Section Covariances for Structural Materials and Fission Products
Hoblit, S.; Hoblit,S.; Cho,Y.-S.; Herman,M.; Mattoon,C.M.; Mughabghab,S.F.; Oblozinsky,P.; Pigni,M.T.; Sonzogni,A.A.
2011-12-01T23:59:59.000Z
We describe neutron cross section covariances for 78 structural materials and fission products produced for the new US evaluated nuclear reaction library ENDF/B-VII.1. Neutron incident energies cover full range from 10{sup -5} eV to 20 MeV and covariances are primarily provided for capture, elastic and inelastic scattering as well as (n,2n). The list of materials follows priorities defined by the Advanced Fuel Cycle Initiative, the major application being data adjustment for advanced fast reactor systems. Thus, in addition to 28 structural materials and 49 fission products, the list includes also {sup 23}Na which is important fast reactor coolant. Due to extensive amount of materials, we adopted a variety of methodologies depending on the priority of a specific material. In the resolved resonance region we primarily used resonance parameter uncertainties given in Atlas of Neutron Resonances and either applied the kernel approximation to propagate these uncertainties into cross section uncertainties or resorted to simplified estimates based on integral quantities. For several priority materials we adopted MF32 covariances produced by SAMMY at ORNL, modified by us by adding MF33 covariances to account for systematic uncertainties. In the fast neutron region we resorted to three methods. The most sophisticated was EMPIRE-KALMAN method which combines experimental data from EXFOR library with nuclear reaction modeling and least-squares fitting. The two other methods used simplified estimates, either based on the propagation of nuclear reaction model parameter uncertainties or on a dispersion analysis of central cross section values in recent evaluated data files. All covariances were subject to quality assurance procedures adopted recently by CSEWG. In addition, tools were developed to allow inspection of processed covariances and computed integral quantities, and for comparing these values to data from the Atlas and the astrophysics database KADoNiS.
Neutron Resonance Parameters and Covariance Matrix of 239Pu
Derrien, Herve [ORNL; Leal, Luiz C [ORNL; Larson, Nancy M [ORNL
2008-08-01T23:59:59.000Z
In order to obtain the resonance parameters in a single energy range and the corresponding covariance matrix, a reevaluation of 239Pu was performed with the code SAMMY. The most recent experimental data were analyzed or reanalyzed in the energy range thermal to 2.5 keV. The normalization of the fission cross section data was reconsidered by taking into account the most recent measurements of Weston et al. and Wagemans et al. A full resonance parameter covariance matrix was generated. The method used to obtain realistic uncertainties on the average cross section calculated by SAMMY or other processing codes was examined.
DESIGNING A KALMAN FILTER WHEN NO NOISE COVARIANCE INFORMATION IS
Van den Hof, Paul
DESIGNING A KALMAN FILTER WHEN NO NOISE COVARIANCE INFORMATION IS AVAILABLE Robert Bos ,1 Xavier Kalman filters using first principles models is often that these models lack a description of the noises that affect the states and the measurements. In these cases, the Kalman filter has to be estimated from data
Inference for Covariate Adjusted Regression via Varying Coefficient Models 1
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
Covariance matrices for use in criticality safety predictability studies
Derrien, H.; Larson, N.M.; Leal, L.C.
1997-09-01T23:59:59.000Z
Criticality predictability applications require as input the best available information on fissile and other nuclides. In recent years important work has been performed in the analysis of neutron transmission and cross-section data for fissile nuclei in the resonance region by using the computer code SAMMY. The code uses Bayes method (a form of generalized least squares) for sequential analyses of several sets of experimental data. Values for Reich-Moore resonance parameters, their covariances, and the derivatives with respect to the adjusted parameters (data sensitivities) are obtained. In general, the parameter file contains several thousand values and the dimension of the covariance matrices is correspondingly large. These matrices are not reported in the current evaluated data files due to their large dimensions and to the inadequacy of the file formats. The present work has two goals: the first is to calculate the covariances of group-averaged cross sections from the covariance files generated by SAMMY, because these can be more readily utilized in criticality predictability calculations. The second goal is to propose a more practical interface between SAMMY and the evaluated files. Examples are given for {sup 235}U in the popular 199- and 238-group structures, using the latest ORNL evaluation of the {sup 235}U resonance parameters.
Manufacturing time operators: covariance, selection criteria, and examples
G. C. Hegerfeldt; J. G. Muga; J. Muñoz
2010-05-27T23:59:59.000Z
We provide the most general forms of covariant and normalized time operators and their probability densities, with applications to quantum clocks, the time of arrival, and Lyapunov quantum operators. Examples are discussed of the profusion of possible operators and their physical meaning. Criteria to define unique, optimal operators for specific cases are given.
Genetic and environmental effects on the covariation between colour polymorphism
Alvarez, Nadir
Genetic and environmental effects on the covariation between colour polymorphism and a life is under disruptive selection with each morph being adapted to specific environmental factors that can. For example, pale and melanistic morphs may absorb varying amounts of solar radiation (Berry and Willmer, 1986
Covariant Lyapunov Vectors for Rigid Disk Systems Hadrien Bosetti
Posch, Harald A.
Covariant Lyapunov Vectors for Rigid Disk Systems Hadrien Bosetti and Harald A. Posch Computational: October 17, 2010) We carry out extensive computer simulations to study the Lyapunov instability of a two enough to allow the formation of Lyapunov modes parallel to the x-axis of the box. The Oseledec splitting
Manufacturing time operators: Covariance, selection criteria, and examples
Hegerfeldt, G. C. [Institut fuer Theoretische Physik, Universitaet Goettingen, Friedrich-Hund-Platz 1, DE-37077 Goettingen (Germany); Muga, J. G.; Munoz, J. [Departamento de Quimica Fisica, Universidad del Pais Vasco, Apartado 644, ES-48080 Bilbao (Spain)
2010-07-15T23:59:59.000Z
We provide the most general forms of covariant and normalized time operators and their probability densities, with applications to quantum clocks, the time of arrival, and Lyapunov quantum operators. Examples are discussed of the profusion of possible operators and their physical meaning. Criteria to define unique, optimal operators for specific cases are given.
A MODEL FOR PHYLOGENETIC INFERENCE USING STRUCTURAL AND CHEMICAL COVARIATES
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
Brief Genetics Report Distinguishing Covariation From Causation in Diabetes
Yandell, Brian S.
Brief Genetics Report Distinguishing Covariation From Causation in Diabetes A Lesson From-induced diabetes. We found that Pdi mRNA is 20-fold more abundant in the diabetes-susceptible BTBR mouse strain relative to the diabetes-resistant C56BL/6 (B6) strain. A genetic analysis was carried out to determine
NOAA Technical Memorandum ERL GLERL-85 COVARIANCE PROPERTIES OF ANNUAL NET BASIN SUPPLIES
NOAA Technical Memorandum ERL GLERL-85 COVARIANCE PROPERTIES OF ANNUAL NET BASIN SUPPLIES ........................................................................................................ 2 2.2 Net Basin Supplies . . . . . . . . . . . 4 Table lb.--Lag-Zero Cross Covariances and Cross Correlations Among Great Lakes Annual Connecting
Jozef Klacka
2002-01-07T23:59:59.000Z
Relativistically covariant form of equation of motion for real particle (body) under the action of electromagnetic radiation is derived. Equation of motion in the proper frame of the particle uses the radiation pressure cross section 3 $\\times$ 3 matrix. Obtained covariant equation of motion is compared with another covariant equation of motion which was presented more than one year ago.
Lorentz covariant field theory on noncommutative spacetime based on DFR algebra
Yoshitaka Okumura
2003-11-05T23:59:59.000Z
Lorentz covariance is the fundamental principle of every relativistic field theory which insures consistent physical descriptions. Even if the space-time is noncommutative, field theories on it should keep Lorentz covariance. In this letter, it is shown that the field theory on noncommutative spacetime is Lorentz covariant if the noncommutativity emerges from the algebra of spacetime operators described by Doplicher, Fredenhagen and Roberts.
Targeting the optimal design in randomized clinical trials with binary outcomes and no covariate
Paris-Sud XI, Université de
Targeting the optimal design in randomized clinical trials with binary outcomes and no covariate of randomized clinical trials with binary treatment, binary outcome and no covariate. By adaptive design, we designs in the case of randomized clinical trials with binary treatment, binary outcome and no covariate
Recent Use of Covariance Data for Criticality Safety Assessment
Rearden, Bradley T [ORNL; Mueller, Don [ORNL
2008-01-01T23:59:59.000Z
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.
Bilinear covariants and spinor fields duality in quantum Clifford algebras
Ab?amowicz, Rafa?, E-mail: rablamowicz@tntech.edu [Department of Mathematics, Box 5054, Tennessee Technological University, Cookeville, Tennessee 38505 (United States); Gonçalves, Icaro, E-mail: icaro.goncalves@ufabc.edu.br [Instituto de Matemática e Estatística, Universidade de São Paulo, Rua do Matão, 1010, 05508-090, São Paulo, SP (Brazil); Centro de Matemática, Computação e Cognição, Universidade Federal do ABC, 09210-170 Santo André, SP (Brazil); Rocha, Roldão da, E-mail: roldao.rocha@ufabc.edu.br [Centro de Matemática, Computação e Cognição, Universidade Federal do ABC, 09210-170 Santo André, SP (Brazil); International School for Advanced Studies (SISSA), Via Bonomea 265, 34136 Trieste (Italy)
2014-10-15T23:59:59.000Z
Classification of quantum spinor fields according to quantum bilinear covariants is introduced in a context of quantum Clifford algebras on Minkowski spacetime. Once the bilinear covariants are expressed in terms of algebraic spinor fields, the duality between spinor and quantum spinor fields can be discussed. Thus, by endowing the underlying spacetime with an arbitrary bilinear form with an antisymmetric part in addition to a symmetric spacetime metric, quantum algebraic spinor fields and deformed bilinear covariants can be constructed. They are thus compared to the classical (non quantum) ones. Classes of quantum spinor fields classes are introduced and compared with Lounesto's spinor field classification. A physical interpretation of the deformed parts and the underlying Z-grading is proposed. The existence of an arbitrary bilinear form endowing the spacetime already has been explored in the literature in the context of quantum gravity [S. W. Hawking, “The unpredictability of quantum gravity,” Commun. Math. Phys. 87, 395 (1982)]. Here, it is shown further to play a prominent role in the structure of Dirac, Weyl, and Majorana spinor fields, besides the most general flagpoles and flag-dipoles. We introduce a new duality between the standard and the quantum spinor fields, by showing that when Clifford algebras over vector spaces endowed with an arbitrary bilinear form are taken into account, a mixture among the classes does occur. Consequently, novel features regarding the spinor fields can be derived.
Light propagation in generally covariant electrodynamics and the Fresnel equation
Friedrich W. Hehl; Yuri N. Obukhov; Guillermo F. Rubilar
2002-03-28T23:59:59.000Z
Within the framework of generally covariant (pre-metric) electrodynamics, we specify a local vacuum spacetime relation between the excitation $H=({\\cal D},{\\cal H})$ and the field strength $F=(E,B)$. We study the propagation of electromagnetic waves in such a spacetime by Hadamard's method and arrive, with the constitutive tensor density $\\kappa\\sim\\partial H/\\partial F$, at a Fresnel equation which is algebraic of 4th order in the wave covector. We determine how the different pieces of $\\kappa$, in particular the axion and the skewon pieces, affect the propagation of light.
Lorentz covariance and gauge invariance in the proton spin problem
S. C. Tiwari
2014-09-01T23:59:59.000Z
In this brief note insightful remarks are made on the controversy on the decomposition of the proton spin into the spin and orbital angular momenta of quarks and gluons. It is argued that the difference in the perception on the nature of the problem is the main reason for the persistent disputes. There is no decomposition that simultaneously satisfies the twin principles of manifest Lorentz covariance and gauge invariance, and partial considerations hide likely inconsistencies. It is suggested that field equations and matter (i. e. electron in QED and quarks in QCD) equations must be analyzed afresh rather than beginning with the expressions of total angular momentum; canonical or otherwise.
Relativistic (covariant) kinetic theory of linear plasma waves and instabilities
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)
2006-06-19T23:59:59.000Z
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.
Covariant cosmological perturbation dynamics in the inflationary universe
Winfried Zimdahl
1998-06-09T23:59:59.000Z
The linear cosmological perturbation theory of almost homogeneous and isotropic perfect fluid and scalar field universes is reconsidered and formally simplified. Using the existence of a covariant conserved quantity on large perturbation scales, a closed integral expression for comoving energy density perturbations is obtained for arbitrary equations of state. On this basis we establish a simple relation between fluid energy density perturbations at `reentry' into the horizon and the corresponding scalar field quantities at the first Hubble scale crossing during an early de Sitter phase of a standard inflationary scenario.
SCALE-6 Sensitivity/Uncertainty Methods and Covariance Data
Williams, Mark L [ORNL; Rearden, Bradley T [ORNL
2008-01-01T23:59:59.000Z
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.
Lyman Alpha Flux Power Spectrum and Its Covariance
Hu Zhan; Romeel Dave; Daniel Eisenstein; Neal Katz
2005-08-10T23:59:59.000Z
We analyze the flux power spectrum and its covariance using simulated Lyman alpha forests. We find that pseudo-hydro techniques are good approximations of hydrodynamical simulations at high redshift. However, the pseudo-hydro techniques fail at low redshift because they are insufficient for characterizing some components of the low-redshift intergalactic medium, notably the warm-hot intergalactic medium. Hence, to use the low-redshift Lyman alpha flux power spectrum to constrain cosmology, one would need realistic hydrodynamical simulations. By comparing one-dimensional mass statistics with flux statistics, we show that the nonlinear transform between density and flux quenches the fluctuations so that the flux power spectrum is much less sensitive to cosmological parameters than the one-dimensional mass power spectrum. The covariance of the flux power spectrum is nearly Gaussian. As such, the uncertainties of the underlying mass power spectrum could still be large, even though the flux power spectrum can be precisely determined from a small number of lines of sight.
Chiral symmetry and ? - ? scattering in the covariant spectator theory
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Biernat, Elmar P; Pena, M. T.; Ribeiro, J. E.; Stadler, Alfred; Gross, Franz
2014-11-01T23:59:59.000Z
The ? - ? scattering amplitude calculated with a model for the quark-antiquark interaction in the framework of the Covariant Spectator Theory (CST) is shown to satisfy the Adler zero constraint imposed by chiral symmetry. The CST formalism is established in Minkowski space and our calculations are performed in momentum space. We prove that the axial-vector Ward-Takahashi identity is satisfied by our model. Then we show that, similarly to what happens within the Bethe-Salpeter formalism, application of the axial-vector Ward Takahashi identity to the CST ? - ? scattering amplitude allows us to sum the intermediate quark-quark interactions to all orders. The Adler self-consistency zero for ? - ? scattering in the chiral limit emerges as the result for this sum.
A covariant model for the nucleon spin structure
Ramalho, G
2015-01-01T23:59:59.000Z
We present the results of the covariant spectator quark model applied to the nucleon structure function $f(x)$ measured in unpolarized deep inelastic scattering, and the structure functions $g_1(x)$ and $g_2(x)$ measured in deep inelastic scattering using polarized beams and targets ($x$ is the Bjorken scaling variable). The nucleon is modeled by a valence quark-diquark structure with $S,P$ and $D$ components. The shape of the wave functions and the relative strength of each component are fixed by making fits to the deep inelastic scattering data for the structure functions $f(x)$ and $g_1(x)$. The model is then used to make predictions on the function $g_2(x)$ for the proton and neutron.
Gross-Neveu and Thirring models. Covariant Gaussian analysis
Rosenstein, B.; Kovner, A.
1989-07-15T23:59:59.000Z
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.
Chiral symmetry and ? - ? scattering in the covariant spectator theory
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Biernat, Elmar P; Pena, M. T.; Ribeiro, J. E.; Stadler, Alfred; Gross, Franz
2014-11-01T23:59:59.000Z
The ? - ? scattering amplitude calculated with a model for the quark-antiquark interaction in the framework of the Covariant Spectator Theory (CST) is shown to satisfy the Adler zero constraint imposed by chiral symmetry. The CST formalism is established in Minkowski space and our calculations are performed in momentum space. We prove that the axial-vector Ward-Takahashi identity is satisfied by our model. Then we show that, similarly to what happens within the Bethe-Salpeter formalism, application of the axial-vector Ward Takahashi identity to the CST ? - ? scattering amplitude allows us to sum the intermediate quark-quark interactions to allmore »orders. The Adler self-consistency zero for ? - ? scattering in the chiral limit emerges as the result for this sum.« less
Computer representation of the model covariance function resulting from travel-time tomography
Cerveny, Vlastislav
Computer representation of the model covariance function resulting from travel-time tomography Lud a supplement to the paper by Klime#20;s (2002b) on the stochastic travel{time tomography. It contains brief covariance function is a function of 6 coordinates with pro- nounced singularities. The computer
A. V. Afanasjev
2015-08-22T23:59:59.000Z
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.
Covariant Lyapunov vectors for rigid disk systems Hadrien Bosetti, Harald A. Posch *
Dellago, Christoph
Covariant Lyapunov vectors for rigid disk systems Hadrien Bosetti, Harald A. Posch * Computational l e i n f o Article history: Available online 10 June 2010 Keywords: Lyapunov instability Hard disks Covariant vectors Statistical mechanics Computer simulation Fluids Lyapunov modes a b s t r a c t We carry
Covariant Lyapunov vectors and local exponents Harald A. Posch and Hadrien Bosetti
Posch, Harald A.
Covariant Lyapunov vectors and local exponents Harald A. Posch and Hadrien Bosetti Faculty the perturbation vectors in tangent space and the associated local Lyapunov exponents. We also find that the local covariant exponents vary discontinuously along directions transverse to the phase flow. Keywords: Lyapunov
Afanasjev, A V
2015-01-01T23:59:59.000Z
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.
Covariance of cross-correlations: towards efficient measures for large-scale structure
Robert E. Smith
2009-06-13T23:59:59.000Z
We study the covariance of the cross-power spectrum of different tracers for the large-scale structure. We develop the counts-in-cells framework for the multi-tracer approach, and use this to derive expressions for the full non-Gaussian covariance matrix. We show, that for the usual auto-power statistic, besides the off-diagonal covariance generated through gravitational mode-coupling, the discreteness of the tracers and their associated sampling distribution can generate strong off-diagonal covariance, and that this becomes the dominant source of covariance as k>>k_f=2 pi/L. On comparison with the derived expressions for the cross-power covariance, we show that the off-diagonal terms can be suppressed, if one cross-correlates a high tracer-density sample with a low one. Taking the effective estimator efficiency to be proportional to the signal-to-noise ratio (SN), we show that, to probe clustering as a function of physical properties of the sample, i.e. cluster mass or galaxy luminosity, then the cross-power approach can out perform the auto-power one by factors of a few. We confront the theory with measurements of the mass-mass, halo-mass, and halo-halo power spectra from a large ensemble of N-body simulations. We show that there is a significant SN advantage to be gained from using the cross-power approach when studying the bias of rare haloes. The analysis is repeated in configuration space and again SN improvement is found. We estimate the covariance matrix for these samples, and find strong off-diagonal contributions. The covariance depends on halo mass, with higher mass samples having stronger covariance. In agreement with theory, we show that the covariance is suppressed for the cross-power. This work points the way towards improved estimators for clustering studies.
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
Covariance Matrix of a Double-Differential Doppler-broadened Elastic Scattering Cross Section
Arbanas, Goran [ORNL; Becker, B. [Rensselaer Polytechnic Institute (RPI); Dagan, R [Institut fur Neutronenphysik und Reaktortechnik; Dunn, Michael E [ORNL; Larson, Nancy M [ORNL; Leal, Luiz C [ORNL; Williams, Mark L [ORNL
2012-01-01T23:59:59.000Z
Legendre moments of a double-differential Doppler-broadened elastic neutron scattering cross section on {sup 238}U are computed near the 6.67 eV resonance at temperature T = 10{sup 3} K up to angular order 14. A covariance matrix of these Legendre moments is computed as a functional of the covariance matrix of the elastic scattering cross section. A variance of double-differential Doppler-broadened elastic scattering cross section is computed from the covariance of Legendre moments.
Covariant Spectator Theory of np scattering: Isoscalar interaction currents
Gross, Franz L. [JLAB
2014-06-01T23:59:59.000Z
Using the Covariant Spectator Theory (CST), one boson exchange (OBE) models have been found that give precision fits to low energy $np$ scattering and the deuteron binding energy. The boson-nucleon vertices used in these models contain a momentum dependence that requires a new class of interaction currents for use with electromagnetic interactions. Current conservation requires that these new interaction currents satisfy a two-body Ward-Takahashi (WT), and using principals of {\\it simplicity\\/} and {\\it picture independence\\/}, these currents can be uniquely determined. The results lead to general formulae for a two-body current that can be expressed in terms of relativistic $np$ wave functions, ${\\it \\Psi}$, and two convenient truncated wave functions, ${\\it \\Psi}^{(2)}$ and $\\widehat {\\it \\Psi}$, which contain all of the information needed for the explicit evaluation of the contributions from the interaction current. These three wave functions can be calculated from the CST bound or scattering state equations (and their off-shell extrapolations). A companion paper uses this formalism to evaluate the deuteron magnetic moment.
On Covariant Poisson Brackets in Classical Field Theory
Michael Forger; Mário O. Salles
2015-01-15T23:59:59.000Z
How to give a natural geometric definition of a covariant Poisson bracket in classical field theory has for a long time been an open problem - as testified by the extensive literature on "multisymplectic Poisson brackets", together with the fact that all these proposals suffer from serious defects. On the other hand, the functional approach does provide a good candidate which has come to be known as the Peierls - De Witt bracket and whose construction in a geometrical setting is now well understood. Here, we show how the basic "multisymplectic Poisson bracket" already proposed in the 1970s can be derived from the Peierls - De Witt bracket, applied to a special class of functionals. This relation allows to trace back most (if not all) of the problems encountered in the past to ambiguities (the relation between differential forms on multiphase space and the functionals they define is not one-to-one) and also to the fact that this class of functionals does not form a Poisson subalgebra.
Application of Covariance Data to Criticality Safety Data Validation
Broadhead, B.L.; Hopper, C.M.; Parks, C.V.
1999-11-13T23:59:59.000Z
The use of cross-section covariance data has long been a key part of traditional sensitivity and uncertainty analyses (S/U). This paper presents the application of S/U methodologies to the data validation tasks of a criticality safety computational study. The S/U methods presented are designed to provide a formal means of establishing the area (or range) of applicability for criticality safety data validation studies. The goal of this work is to develop parameters that can be used to formally determine the ''similarity'' of a benchmark experiment (or a set of benchmark experiments individually) and the application area that is to be validated. These parameters are termed D parameters, which represent the differences by energy group of S/U-generated sensitivity profiles, and ck parameters, which are the correlation coefficients, each of which gives information relative to the similarity between pairs of selected systems. The application of a Generalized Linear Least-Squares Methodology ( GLLSM) tool to criticality safety validation tasks is also described in this paper. These methods and guidelines are also applied to a sample validation for uranium systems with enrichments greater than 5 wt %.
Particle-vibration coupling within covariant density functional theory
E. Litvinova; P. Ring; V. Tselyaev
2007-05-08T23:59:59.000Z
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.
Effective Action and Hawking Flux from Covariant Perturbation Theory
D. Hofmann; W. Kummer
2004-08-26T23:59:59.000Z
The computation of the radiation flux related to the Hawking temperature of a Schwarzschild Black Hole or another geometric background is still well-known to be fraught with a number of delicate problems. In spherical reduction, as shown by one of the present authors (W. K.) with D.V. Vassilevich, the correct black body radiation follows when two ``basic components'' (conformal anomaly and a ``dilaton'' anomaly) are used as input in the integrated energy-momentum conservation equation. The main new element in the present work is the use of a quite different method, the covariant perturbation theory of Barvinsky and Vilkovisky, to establish directly the full effective action which determines these basic components. In the derivation of W. K. and D.V. Vassilevich the computation of the dilaton anomaly implied one potentially doubtful intermediate step which can be avoided here. Moreover, the present approach also is sensitive to IR (renormalisation) effects. We realize that the effective action naturally leads to expectation values in the Boulware vacuum which, making use of the conservation equation, suffice for the computation of the Hawking flux in other quantum states, in particular for the relevant Unruh state. Thus, a rather comprehensive discussion of the effects of (UV and IR) renormalisation upon radiation flux and energy density is possible.
Covariance Analysis of Symmetry Energy Observables from Heavy Ion Collision
Zhang, Yingxun; Li, Zhuxia
2015-01-01T23:59:59.000Z
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...
Cross-Section Covariance Data Processing with the AMPX Module PUFF-IV
Wiarda, Dorothea [ORNL; Leal, Luiz C [ORNL; Dunn, Michael E [ORNL
2011-01-01T23:59:59.000Z
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.
Eddy covariance flux measurements of pollutant gases in urban Mexico City
Velasco, Erik
Eddy covariance (EC) flux measurements of the atmosphere/surface exchange of gases over an urban area are a direct way to improve and evaluate emissions inventories, and, in turn, to better understand urban atmospheric ...
EXTENSIVE SET OF LOW-FIDELITY COVARIANCES IN FAST NEUTRON REGION.
PIGNI,M.T.; HERMAN, M.; OBLOZINSKY, P.; ROCHMAN, D.
2007-07-30T23:59:59.000Z
An extensive set of covariances for neutron cross sections has been developed to provide initial, low-fidelity but consistent uncertainty data for nuclear criticality safety applications. The methodology for the determination of such covariances in fast neutron region is presented. It combines the nuclear reaction code EMPIRE, which calculates sensitivity to nuclear reaction model parameters and the Bayesian code KALMAN to propagate uncertainty of the model parameters onto cross sections. Taking into account the large scale of the project (219 fission products), only partial reference to experimental data has been made. Therefore, the covariances are, to a large extent, derived from the perturbation of several critical model parameters selected through the sensitivity analysis. They define optical potential, level densities and pre-equilibrium emission. This exercise represents the first attempt to generate nuclear data covariances on such a scale.
Applications of nuclear data covariances to criticality safety and spent fuel characterization
Williams, Mark L [ORNL] [ORNL; Ilas, Germina [ORNL] [ORNL; Marshall, William BJ J [ORNL] [ORNL; Rearden, Bradley T [ORNL] [ORNL
2014-01-01T23:59:59.000Z
Covariance data computational methods and data used for sensitivity and uncertainty analysis within the SCALE nuclear analysis code system are presented. Applications in criticality safety calculations and used nuclear fuel analysis are discussed.
Brain covariance selection: better individual functional connectivity models using population prior
Paris-Sud XI, Université de
Brain covariance selection: better individual functional connectivity models using population prior bertrand.thirion@inria.fr Abstract Spontaneous brain activity, as observed in functional neuroimaging, has been shown to display reproducible structure that expresses brain architecture and car- ries markers
Lee, Yuan-Hsuan
2011-10-21T23:59:59.000Z
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 ...
An analysis of Texas rainfall data and asymptotic properties of space-time covariance estimators
Li, Bo
2009-06-02T23:59:59.000Z
This dissertation includes two parts. Part 1 develops a geostatistical method to calibrate Texas NexRad rainfall estimates using rain gauge measurements. Part 2 explores the asymptotic joint distribution of sample space-time covariance estimators...
July 20, 2001; rev. August 16, 2001 General Covariance, Gauge Theories and the Kretschmann
1 July 20, 2001; rev. August 16, 2001 General Covariance, Gauge Theories and the Kretschmann of Parma, June 21-23, 2001, organized by Massimo Pauri. #12;2 1. Introduction Two views... When Einstein
Covariant Schwarzschild perturbations I: Initial value formulation for scalars of spin-weight -+ 2
R. B. Burston; A. W. C. Lun
2006-11-08T23:59:59.000Z
We consider full perturbations to a covariantly defined Schwarzschild spacetime. By constructing complex quantities, we derive two decoupled, covariant and gauge-invariant, wave-like equations for spin-weighted scalars. These arise naturally from the Bianchi identities and comprise a covariant representation of the Bardeen-Press equations for scalars with spin-weight $\\pm2$. Furthermore, the covariant and gauge-invariant 1+1+2 formalism is employed, and consequently, the physical interpretation of the energy-momentum perturbations is transparent. They are written explicitly in terms of the energy-momentum specified on spacelike three-slices. Ultimately, a Cauchy problem is constructed whereby, an initial three-slice may be perturbed by an energy-momentum source, which induces resultant gravitational fields.
, which we refer to as dynamic covariate information. For example, even a small device like a power inverter that are used in solar panel arrays can gather and transmit information on the output of power
2009-01-01T23:59:59.000Z
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
The manifestly covariant Aharonov-Bohm effect in terms of the 4D fields
Tomislav Ivezic
2014-11-21T23:59:59.000Z
In this paper it is presented a manifestly covariant formulation of the Aharonov-Bohm (AB) phase difference for the magnetic AB effect . This covariant AB phase is written in terms of the Faraday 2-form F and using the decomposition of F in terms of the electric and magnetic fields as four-dimensional (4D) geometric quantities. It is shown that there is a static electric field outside a stationary solenoid with resistive conductor carrying steady current, which causes that the AB phase difference in the magnetic AB effect may be determined by the electric part of the covariant expression, i.e. by the local influence of the 4D electric field and not, as generally accepted,in terms of nonzero vector potential.
PRELIMINARY CROSS SECTION AND NU-BAR COVARIANCES FOR WPEC SUBGROUP 26
ROCHMAN,D.
2007-01-31T23:59:59.000Z
We report preliminary cross section covariances developed for the WPEC Subgroup 26 for 45 out of 52 requested materials. The covariances were produced in 15- and 187-group representations as follows: (1) 36 isotopes ({sup 16}O, {sup 19}F, {sup 23}Na, {sup 27}Al, {sup 28}Si, {sup 52}Cr, {sup 56,56}Fe, {sup 58}Ni, {sup 90,91,92,94}Zr, {sup 166,167,168,170}Er, {sup 206,207,208}Pb, {sup 209}Bi, {sup 233,234,236}U, {sup 237}Np, {sup 238,240,241,242}Pu, {sup 241,242m,243}Am, {sup 242,243,244,245}Cm) were evaluated using the BNL-LANL methodology. For the thermal region and the resolved and unresolved resonance regions, the methodology has been based on the Atlas-Kalman approach, in the fast neutron region the Empire-Kalman method has been used; (2) 6 isotopes ({sup 155,156,157,158,160}Gd and {sup 232}Th) were taken from ENDF/B-VII.0; and (3) 3 isotopes ({sup 1}H, {sup 238}U and {sup 239}Pu) were taken from JENDL-3.3. For 6 light nuclei ({sup 4}He, {sup 6,7}Li, {sup 9}Be, {sup 10}B, {sup 12}C), only partial cross section covariance results were obtained, additional work is needed and they do not report the results here. Likewise, the cross section covariances for {sup 235}U, which they recommend to take from JENDL-3.3, will be included once the multigroup processing is successfully completed. Covariances for the average number of neutrons per fission, total {nu}-bar, are provided for 10 actinides identified as priority by SG26. Further work is needed to resolve some of the issues and to produce covariances for the full set of 52 materials.
V. Pelykh
2004-08-18T23:59:59.000Z
The elliptic system of equations, which is general-covariant and locally SU(2)-covariant, is investigated. The new condition of the Dirichlet problem solvability and the condition of zeros absence for solutions are obtained for this system, which contains in particular case the Sen-Witten equation. On this basis it is proved the existence of the wide class of hypersurfaces, in all points of which there exists a correspondence between the Sen-Witten spinor field and three-frame, which generalizes the Nester orthoframe. The Nester special orthoframe also exists on a certain subclass containing not only the maximal hypersurfaces.
Review and Assessment of Neutron Cross Section and Nubar Covariances for Advanced Reactor Systems
Maslov,V.M.; Oblozinsky, P.; Herman, M.
2008-12-01T23:59:59.000Z
In January 2007, the National Nuclear Data Center (NNDC) produced a set of preliminary neutron covariance data for the international project 'Nuclear Data Needs for Advanced Reactor Systems'. The project was sponsored by the OECD Nuclear Energy Agency (NEA), Paris, under the Subgroup 26 of the International Working Party on Evaluation Cooperation (WPEC). These preliminary covariances are described in two recent BNL reports. The NNDC used a simplified version of the method developed by BNL and LANL that combines the recent Atlas of Neutron Resonances, the nuclear reaction model code EMPIRE and the Bayesian code KALMAN with the experimental data used as guidance. There are numerous issues involved in these estimates of covariances and it was decided to perform an independent review and assessment of these results so that better covariances can be produced for the revised version in future. Reviewed and assessed are uncertainties for fission, capture, elastic scattering, inelastic scattering and (n,2n) cross sections as well as prompt nubars for 15 minor actinides ({sup 233,234,236}U, {sup 237}Np, {sup 238,240,241,242}Pu, {sup 241,242m,243}Am and {sup 242,243,244,245}Cm) and 4 major actinides ({sup 232}Th, {sup 235,238}U and {sup 239}Pu). We examined available evaluations, performed comparison with experimental data, taken into account uncertainties in model parameterization and made use state-of-the-art nuclear reaction theory to produce the uncertainty assessment.
Brain covariance selection: better individual functional connectivity models using population prior
Brain covariance selection: better individual functional connectivity models using population prior.thirion@inria.fr Abstract Spontaneous brain activity, as observed in functional neuroimaging, has been shown to display reproducible structure that expresses brain architecture and car- ries markers of brain pathologies
Conditional quantiles when the covariates are curves : an application to Ozone pollution
Bercu, Bernard
Conditional quantiles when the covariates are curves : an application to Ozone pollution forecasting Summary This work deals with the study of pollution data with the aim of forecas- ting the Ozone of the maximum of Ozone one day kno- wing one or several of these functional variables the day before. To do this
A Nonparametric Matching Method for Covariate Adjustment with Application to Economic Evaluation
Sekhon, Jasjeet S.
A Nonparametric Matching Method for Covariate Adjustment with Application to Economic Evaluation of propensity score and Mahalanobis distance matching. We apply Genetic Matching to an economic evaluation and nonparametric methods; observational stud- ies; health economic evaluation #12;1 Introduction Progress has been
Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net
Low, Steven H.
. Furthermore, un- like the Lasso, the Elastic Net can yield a sparse esti- mate with more than n non-zero477 Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net Alexander to regression regulariza- tion called the Pairwise Elastic Net is pro- posed. Like the Elastic Net, it simultane
Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net
Blei, David M.
, the Elastic Net can yield a sparse esti- mate with more than n non-zero weights (Efron et al., 2004). One canExploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net Alexander Lorbert- tion called the Pairwise Elastic Net is pro- posed. Like the Elastic Net, it simultane- ously performs
Covariation of coastal water temperature and microbial pollution at interannual to tidal periods
Winant, Clinton D.
% of the 21,349,000 acres of shellfish harvesting waters in the U.S. were harvest-limited due to FIBCovariation of coastal water temperature and microbial pollution at interannual to tidal periods 30 March 2004. [1] Water temperature and fecal indicator bacteria levels covary along the shoreline
A birational mapping with a strange attractor: Post critical set and covariant curves
M. Bouamra; S. Hassani; J. -M. Maillard
2009-06-14T23:59:59.000Z
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.
Estimated 55Mn and 90Zr cross section covariances in the fast neutron energy region
Pigni,M.T.; Herman, M.; Oblozinsky, P.
2008-06-24T23:59:59.000Z
We completed estimates of neutron cross section covariances for {sup 55}Mn and {sup 90}Zr, from keV range to 25 MeV, considering the most important reaction channels, total, elastic, inelastic, capture, and (n,2n). The nuclear reaction model code EMPIRE was used to calculate sensitivity to model parameters by perturbation of parameters that define the optical model potential, nuclear level densities and strength of the pre-equilibrium emission. The sensitivity analysis was performed with the set of parameters which reproduces the ENDF/B-VII.0 cross sections. The experimental data were analyzed and both statistical and systematic uncertainties were extracted from almost 30 selected experiments. Then, the Bayesian code KALMAN was used to combine the sensitivity analysis and the experiments to obtain the evaluated covariance matrices.
Schubert, Sebastian
2015-01-01T23:59:59.000Z
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...
Cheng-Yi Sun; Yu Song; Rui-Hong Yue
2011-10-09T23:59:59.000Z
It was found that the model with interaction between cold dark matter (CDM) and dark energy (DE) proportional to the energy density of CDM $\\rho_m$ and constant equation of state of DE $w_d$ suffered from instabilities of the density perturbations on the supper-Hubble scales. Here we suggest a new covariant model for the energy-momentum transfer between CDM and DE. Then using the covariant model, we analyze the evolution of density perturbations on the supper-Hubble scale. We find that the instabilities can be avoided in the model with constant $w_d$ and interaction proportional to $\\rho_m$. Furthermore, we analyze the dominant non-adiabatic mode in the radiation era and find that the mode grows regularly.
Restoration of the covariant gauge ? in the initial field of gravity in de Sitter spacetime
Cheong, Lee Yen; Yan, Chew Xiao [Department of Fundamental and Applied Sciences, Universiti Teknologi Petronas, Bandar Seri Iskandar, Tronoh 31750, Perak (Malaysia)
2014-03-05T23:59:59.000Z
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.
DEVELOPMENT OF ENDF/B-VII.1 AND ITS COVARIANCE COMPONENT
Herman, M.
2010-04-30T23:59:59.000Z
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.
0v{beta}{beta} decay: theoretical nuclear matrix elements and their covariances
Lisi, Eligio [Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Via Orabona 4, 70126 Bari (Italy)
2009-11-09T23:59:59.000Z
Within the quasiparticle random phase approximation (QRPA), the covariances associated to the nuclear matrix elements (NME) of neutrinoless double beta decay (0v{beta}{beta}) are estimated. It is shown that correlated NME uncertainties play an important role in the comparison of 0v{beta}{beta} decay rates for different nuclei, both in the standard case of light Majorana neutrino exchange, and in nonstandard physics cases.
A covariant model for the $?^\\ast N \\to N^\\ast(1520)$ reaction
G. Ramalho; M. T. Pena
2014-02-03T23:59:59.000Z
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 $Q^2$.
The periodic variations of the covariance and the effect on the probability of collision
Yang, Jung-Hwa
2002-01-01T23:59:59.000Z
variation l. (0 &p: 0 ~ 05~ G&p: l cF&0: rr) QBd o'rp: rl / 10) 2. 5 x10 4 o vs Time 15 X o 1 0. 5 x10 5 3 0 0 1 2 3 time (orbit) Figure 3. 3 Simple covariance variation 2. (rr?, =1/3, rr?, =1, cr?, = J2n, and o, =1/2) 31 The out of plane...
Entropy Production and Equilibrium Conditions in General-Covariant Continuum Physics
Wolfgang Muschik; Horst-Heino v. Borzeszkowski
2015-01-03T23:59:59.000Z
Starting out with an entropy identity, the entropy flux, the entropy production and the corresponding Gibbs and Gibbs-Duhem equations of general-covariant conti\\-nuum thermodynamics are established. Non-dissipative materials and equilibria are investigated. It is proved that equilibrium conditions only put on material properties cannot generate equilibria, rather additionally, the Killing property of the 4-temperature is a necessary condition for space-times in which equilibria are possible.
A Concise Method for Storing and Communicating the Data Covariance Matrix
Larson, Nancy M [ORNL
2008-10-01T23:59:59.000Z
The covariance matrix associated with experimental cross section or transmission data consists of several components. Statistical uncertainties on the measured quantity (counts) provide a diagonal contribution. Off-diagonal components arise from uncertainties on the parameters (such as normalization or background) that figure into the data reduction process; these are denoted systematic or common uncertainties, since they affect all data points. The full off-diagonal data covariance matrix (DCM) can be extremely large, since the size is the square of the number of data points. Fortunately, it is not necessary to explicitly calculate, store, or invert the DCM. Likewise, it is not necessary to explicitly calculate, store, or use the inverse of the DCM. Instead, it is more efficient to accomplish the same results using only the various component matrices that appear in the definition of the DCM. Those component matrices are either diagonal or small (the number of data points times the number of data-reduction parameters); hence, this implicit data covariance method requires far less array storage and far fewer computations while producing more accurate results.
ORNL Resolved Resonance Covariance Generation for ENDF/B-VII.1
Leal, Luiz C. [ORNL; Guber, Klaus H. [ORNL; Wiarda, Dorothea [ORNL] [ORNL; Arbanas, Goran [ORNL] [ORNL; Derrien, Herve [ORNL] [ORNL; Sayer, Royce O. [ORNL; Larson, Nancy M. [ORNL; Dunn, Michael E. [ORNL
2012-12-01T23:59:59.000Z
Resonance-parameter covariance matrix (RPCM) evaluations in the resolved resonance regionwere done at the Oak Ridge National Laboratory (ORNL) for the chromium isotopes, titanium isotopes, 19F, 58Ni, 60Ni, 35Cl, 37Cl, 39K, 41K, 55Mn, 233U, 235U, 238U, and 239Pu using the computer code SAMMY. The retroactive approach of the code SAMMY was used to generate the RPCMs for 233U. For 235U, the approach used for covariance generation was similar to the retroactive approach with the distinction that real experimental data were used as opposed to data generated from the resonance parameters. RPCMs for 238U and 239Pu were generated together with the resonance parameter evaluations. The RPCMs were then converted in the ENDF format using the FILE32 representation. Alternatively, for computer storage reasons, the FILE32 was converted in the FILE33 cross section covariance matrix (CSCM). Both representations were processed using the computer code PUFF-IV. This paper describes the procedures used to generate the RPCM and CSCM in the resonance region for ENDF/B-VII.1. The impact of data uncertainty in nuclear reactor benchmark calculations is also presented.
Robert R. Lompay; Alexander N. Petrov
2013-07-01T23:59:59.000Z
Arbitrary diffeomorphically invariant metric-torsion theories of gravity are considered. It is assumed that Lagrangians of such theories contain derivatives of field variables (tensor densities of arbitrary ranks and weights) up to a second order only. The generalized Klein-Noether methods for constructing manifestly covariant identities and conserved quantities are developed. Manifestly covariant expressions are constructed without including auxiliary structures like a background metric. In the Riemann-Cartan space, the following \\emph{manifestly generally covariant results} are presented: (a) The complete generalized system of differential identities (the Klein-Noether identities) is obtained. (b) The generalized currents of three types depending on an arbitrary vector field displacements are constructed: they are the canonical Noether current, symmetrized Belinfante current and identically conserved Hilbert-Bergmann current. In particular, it is stated that the symmetrized Belinfante current does not depend on divergences in the Lagrangian. (c) The generalized boundary Klein theorem (third Noether theorem) is proved. (d) The construction of the generalized superpotential is presented in details, and questions related to its ambiguities are analyzed.
Bystroff, Christopher; Webb-Robertson, Bobbie-Jo M.
2009-05-06T23:59:59.000Z
Amino acid sequence probability distributions, or profiles, have been used successfully to predict secondary structure and local structure in proteins. Profile models assume the statistical independence of each position in the sequence, but the energetics of protein folding is better captured in a scoring function that is based on pairwise interactions, like a force field. I-sites motifs are short sequence/structure motifs that populate the protein structure database due to energy-driven convergent evolution. Here we show that a pairwise covariant sequence model does not predict alpha helix or beta strand significantly better overall than a profile-based model, but it does improve the prediction of certain loop motifs. The finding is best explained by considering secondary structure profiles as multivariant, all-or-none models, which subsume covariant models. Pairwise covariance is nonetheless present and energetically rational. Examples of negative design are present, where the covariances disfavor non-native structures. Measured pairwise covariances are shown to be statistically robust in cross-validation tests, as long as the amino acid alphabet is reduced to nine classes. We present an updated I-sites local structure motif library and web server that provide sequence covariance information for all types of local structure in globular proteins.
Smart Doorplate WOLFGANG TRUMLER, FARUK BAGCI, JAN PETZOLD, THEO UNGERER
Ungerer, Theo
}@informatik.uniÂaugsburg.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 contextÂaware and networked smart appliances. Most smart building technologies are developed for smart
Smart Doorplate WOLFGANG TRUMLER, FARUK BAGCI, JAN PETZOLD, THEO UNGERER
Ungerer, Theo
}@informatik.uni-augsburg.de Abstract: This paper introduces the vision of smart doorplates within an office building. The doorplates. Introduction Smart buildings represent an important application area of ubiquitous computing that includes context-aware and networked smart appliances. Most smart building technologies are developed for smart
NEUTRON CROSS SECTION COVARIANCES FROM THERMAL ENERGY TO 20 MeV.
ROCHMAN,D.; HERMAN, M.; OBLOZINSKY, P.; MUGHABGHAB, S.F.; PIGNI, M.; KAWANO, T.
2007-04-27T23:59:59.000Z
We describe new method for energy-energy covariance calculation from the thermal energy up to 20 MeV. It is based on three powerful basic components: (i) Atlas of Neutron Resonances in the resonance region; (ii) the nuclear reaction model code EMPIRE in the unresolved resonance and fast neutron regions, and (iii) the Bayesian code KALMAN for correlations and error propagation. Examples for cross section uncertainties and correlations on {sup 90}Zr and {sup 193}Ir illustrate this approach in the resonance and fast neutron regions.
Photon-neutrino interaction in theta-exact covariant noncommutative field theory
R. Horvat; D. Kekez; P. Schupp; J. Trampetic; J. You
2011-08-04T23:59:59.000Z
Photon-neutrino interactions arise quite naturally in noncommutative field theories. Such couplings are absent in ordinary field theory and imply experimental lower bounds on the energy scale Lambda_NC ~ 1/|theta|^2 of noncommutativity. Using non-perturbative methods and a Seiberg-Witten map based covariant approach to noncommutative gauge theory, we obtain theta-exact expressions for the interactions, thereby eliminating previous restrictions to low-energy phenomena. We discuss implications for plasmon decay, neutrino charge radii, big bang nucleosynthesis and ultrahigh energy cosmic rays. Our results behave reasonably throughout all interaction energy scales, thus facilitating further phenomenological applications.
Covariant asymmetric wave packet for a field-theoretical description of neutrino oscillations
V. A. Naumov; D. S. Shkirmanov
2014-09-16T23:59:59.000Z
We consider a class of models for the relativistic covariant wave packets which can be used as asymptotically free in and out states in the quantum field theoretical formalisms for description of the neutrino flavor oscillation phenomenon. We demonstrate that the new "asymmetric" wave packet (AWP) is an appropriate alternative for the more convenient "symmetric" wave packets, like the so-called relativistic Gaussian packet (RGP) widely used in the QFT-based approaches to neutrino oscillations. We show that RGP is not a particular case of AWP, although many properties of these models are almost identical in the quasistable regime. We discuss some features of AWP distinguishing it from RGP.
Covariant asymmetric wave packet for a field-theoretical description of neutrino oscillations
Naumov, V A
2014-01-01T23:59:59.000Z
We consider a class of models for the relativistic covariant wave packets which can be used as asymptotically free in and out states in the quantum field theoretical formalisms for description of the neutrino flavor oscillation phenomenon. We demonstrate that the new "asymmetric" wave packet (AWP) is an appropriate alternative for the more convenient "symmetric" wave packets, like the so-called relativistic Gaussian packet (RGP) widely used in the QFT-based approaches to neutrino oscillations. We show that RGP is not a particular case of AWP, although many properties of these models are almost identical in the quasistable regime. We discuss some features of AWP distinguishing it from RGP.
PIGNI,M.T.; HERMAN, M.; OBLOZINSKY, P.
2008-03-01T23:59:59.000Z
We produced a large set of neutron cross section covariances in the energy range of 5 keV-20 MeV. The present set of data on 57 structural materials and 31 heavy nuclei follows our earlier work on 219 fission product materials and completes our extensive contribution to the low-fidelity covariance project (307 materials). This project aims to provide initial, low-fidelity yet consistent estimates of covariance data for nuclear criticality safety applications. The evaluation methodology combines the nuclear reaction model code EMPIRE which calculates sensitivity to nuclear reaction model parameters, and the Bayesian code KALMAN that propagates uncertainties of the model parameters to cross sections. Taking into account the large scale of the project, only marginal reference to experimental data was made. The covariances were derived from the perturbation of several key model parameters selected by the sensitivity analysis. These parameters refer to the optical model potential, the level densities and the strength of the pre-equilibrium emission. This work represents the first attempt ever to generate nuclear data covariances on such a large scale.
Pion production in proton-proton collisions in a covariant one boson exchange model
A. Engel; A. K. Dutt-Mazumder; R. Shyam; U. Mosel
1996-01-18T23:59:59.000Z
Motivated by the renewed interest in studying the pion production on nuclei with protons at few GeV incident energies, we investigate the pion production in proton-proton collisions over an energy range of 300 $MeV$ to 2 $GeV$. Starting from a realistic one-boson exchange model with parameters fitted to the amplitudes of the elastic nucleon-nucleon scattering, we perform fully covariant calculations for the total, double and triple differential cross-sections of the $p(p,n\\pi^+)p$ and $p(p,p\\pi^0)p$ reactions. The calculations incorporate the exchange of $\\pi, \\rho,\\omega$ and $\\sigma$ mesons and treat nucleon and delta isobar as intermediate states. We obtain a reasonably good agreement with the experimental data in the entire range of beam energies. The form of the covariant delta propagator, the cut-off parameter for the $\\pi NN$ and $\\pi N\\Delta$ vertex form factors and the energy dependence of the delta isobar decay width is investigated.
Deformed Hamilton-Jacobi Method in Covariant Quantum Gravity Effective Models
Mu Benrong; Peng Wang; Haitang Yang
2014-08-21T23:59:59.000Z
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.
Deformed Hamilton-Jacobi Method in Covariant Quantum Gravity Effective Models
Benrong, Mu; Yang, Haitang
2014-01-01T23:59:59.000Z
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...
Simulik, V M
2015-01-01T23:59:59.000Z
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...
Cremaschini, Claudio, E-mail: claudiocremaschini@gmail.com; Stuchlík, Zden?k [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic)] [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic); Tessarotto, Massimo [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic) [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezru?ovo nám.13, CZ-74601 Opava (Czech Republic); Department of Mathematics and Geosciences, University of Trieste, Via Valerio 12, 34127 Trieste (Italy)
2014-05-15T23:59:59.000Z
Astrophysical plasmas in the surrounding of compact objects and subject to intense gravitational and electromagnetic fields are believed to give rise to relativistic regimes. Theoretical and observational evidences suggest that magnetized plasmas of this type are collisionless and can persist for long times (e.g., with respect to a distant observer, coordinate, time), while exhibiting geometrical structures characterized by the absence of well-defined spatial symmetries. In this paper, the problem is posed whether such configurations can correspond to some kind of kinetic equilibrium. The issue is addressed from a theoretical perspective in the framework of a covariant Vlasov statistical description, which relies on the method of invariants. For this purpose, a systematic covariant variational formulation of gyrokinetic theory is developed, which holds without requiring any symmetry condition on the background fields. As a result, an asymptotic representation of the relativistic particle magnetic moment is obtained from its formal exact solution, in terms of a suitably defined invariant series expansion parameter (perturbative representation). On such a basis, it is shown that spatially non-symmetric kinetic equilibria can actually be determined, an example being provided by Gaussian-like distributions. As an application, the physical mechanisms related to the occurrence of a non-vanishing equilibrium fluid 4-flow are investigated.
Do we need model-dependent covariances when we test cosmological models with galaxy power spectra?
Kalus, B; Samushia, L
2015-01-01T23:59:59.000Z
We consider the shape of the posterior distribution to be used when fitting cosmological models to power spectra measured from galaxy surveys. At very large scales, Gaussian posterior distributions in the power do not approximate the posterior distribution $\\mathcal P_R$ we expect for a Gaussian density field $\\delta_\\mathbf{k}$, even if we vary the covariance matrix according to the model to be tested. We compare alternative posterior distributions with $\\mathcal P_R$, both mode-by-mode and in terms of expected $f_\\mathrm{NL}$-measurements. Marginalising over a Gaussian posterior distribution $\\mathcal P_f$ with fixed covariance matrix yields a posterior mean value of $f_\\mathrm{NL}$ which, for a data set with the characteristics of Euclid, will be underestimated by $\\triangle f_\\mathrm{NL}=0.4$, while for the data release 9 (DR9) of the Sloan Digital Sky Survey (SDSS)-III Baryon Oscillation Spectroscopic Survey (BOSS) it will be underestimated by $\\triangle f_\\mathrm{NL}=19.1$. The inverse cubic normal dist...
Non-Gaussian Covariance of CMB B-modes of Polarization and Parameter Degradation
Chao Li; Tristan L. Smith; Asantha Cooray
2006-08-01T23:59:59.000Z
The B-mode polarization lensing signal is a useful probe of the neutrino mass and to a lesser extent the dark energy equation of state as the signal depends on the integrated mass power spectrum between us and the last scattering surface. This lensing B-mode signal, however, is non-Gaussian and the resulting non-Gaussian covariance to the power spectrum cannot be ignored as correlations between B-mode bins are at a level of 0.1. For temperature and E-mode polarization power spectra, the non-Gasussian covariance is not significant, where we find correlations at the 10^{-5} level even for adjacent bins. The resulting degradation on neutrino mass and dark energy equation of state is about a factor of 2 to 3 when compared to the case where statistics are simply considered to be Gaussian. We also discuss parameter uncertainties achievable in upcoming experiments and show that at a given angular resolution for polarization observations, increasing the sensitivity beyond a certain noise value does not lead to an improved measurement of the neutrino mass and dark energy equation of state with B-mode power spectrum. For Planck, the resulting constraints on the sum of the neutrino masses is ~ 0.2 eV and on the dark energy equation of state parameter we find, sigma_w ~ 0.5.
Quarkonia and heavy-light mesons in a covariant quark model
Leitão, Sofia; Peña, M T; Biernat, Elmar P
2015-01-01T23:59:59.000Z
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.
Yao, J M; Hagino, K; Ring, P; Meng, J
2014-01-01T23:59:59.000Z
We report a systematic study of nuclear matrix elements (NMEs) in neutrinoless double-beta decays with state-of-the-art beyond mean-field covariant density functional theory. The dynamic effects of particle-number and angular-momentum conservations as well as quadrupole shape fluctuations are taken into account with projections and generator coordinate method for both initial and final nuclei. The full relativistic transition operator is adopted to calculate the NMEs which are found to be consistent with the results of previous beyond non-relativistic mean-field calculation based on a Gogny force with the exception of $^{150}$Nd. Our study shows that the total NMEs can be well approximated by the pure axial-vector coupling term, the calculation of which is computationally much cheaper than that of full terms.
Time-odd mean fields in covariant density functional theory I. Non-rotating systems
A. V. Afanasjev; H. Abusara
2010-10-09T23:59:59.000Z
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.
P. W. Zhao; Z. P. Li; J. M. Yao; J. Meng
2010-11-11T23:59:59.000Z
A new parametrization PC-PK1 for the nuclear covariant energy density functional with nonlinear point-coupling interaction is proposed by fitting to observables for 60 selected spherical nuclei, including the binding energies, charge radii and empirical pairing gaps. The success of PC-PK1 is illustrated in its description for infinite nuclear matter and finite nuclei including the ground-state and low-lying excited states. Particularly, PC-PK1 improves the description for isospin dependence of binding energy along either the isotopic or the isotonic chains, which makes it more reliable for application in exotic nuclei. The predictive power of PC-PK1 is also illustrated for the nuclear low-lying excitation states in a five-dimensional collective Hamiltonian in which the parameters are determined by constrained calculations for triaxial shapes.
Qian Zhao; Bao Yuan Sun; Wen Hui Long
2014-11-23T23:59:59.000Z
The isospin coupling-channel decomposition of the potential energy density functional is carried out within the covariant density functional theory, and their isospin and density dependence in particular the influence on the symmetry energy is studied. It is found that both isospin-singlet and isospin-triplet components of the potential energy play the dominant role in deciding the symmetry energy, especially when the Fock diagram is introduced. The results illustrate a quite different mechanism to the origin of the symmetry energy from the microscopic Brueckner-Hartree-Fock theory, and demonstrate the importance of the Fork diagram in the CDF theory, especially from the isoscalar mesons, in the isospin properties of the in-medium nuclear force at high density.
Qiang Zhao; Jian Min Dong; Jun Ling Song; Wen Hui Long
2014-07-23T23:59:59.000Z
Half-life of proton radioactivity of spherical proton emitters is studied within the scheme of covariant density functional (CDF) theory, and for the first time the potential barrier that prevents the emitted proton is extracted with the similarity renormalization group (SRG) method, in which the spin-orbit potential along with the others that turn out to be non-negligible can be derived automatically. The spectroscopic factor that is significant is also extracted from the CDF calculations. The estimated half-lives are found in good agreement with the experimental values, which not only confirms the validity of the CDF theory in describing the proton-rich nuclei, but also indicates the prediction power of present approach to calculate the half-lives and in turn to extract the structural information of proton emitters.
A covariant model for the gamma N -> N(1535) transition at high momentum transfer
G. Ramalho, M.T. Pena
2011-08-01T23:59:59.000Z
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.
K+'s Collective Flow in Heavy-ion Collisions predicted by Covariant Kaon Dynamics
Yong-Zhong Xing; Yue-Qian Dai; Yu-Ming Zheng
2014-11-03T23:59:59.000Z
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.
Robust ensemble filtering and its relation to covariance inflation in the ensemble Kalman filter
Xiaodong Luo; Ibrahim Hoteit
2011-07-31T23:59:59.000Z
We propose a robust ensemble filtering scheme based on the $H_{\\infty}$ filtering theory. The optimal $H_{\\infty}$ filter is derived by minimizing the supremum (or maximum) of a predefined cost function, a criterion different from the minimum variance used in the Kalman filter. By design, the $H_{\\infty}$ filter is more robust than the Kalman filter, in the sense that the estimation error in the $H_{\\infty}$ filter in general has a finite growth rate with respect to the uncertainties in assimilation, except for a special case that corresponds to the Kalman filter. The original form of the $H_{\\infty}$ filter contains global constraints in time, which may be inconvenient for sequential data assimilation problems. Therefore we introduce a variant that solves some time-local constraints instead, and hence we call it the time-local $H_{\\infty}$ filter (TLHF). By analogy to the ensemble Kalman filter (EnKF), we also propose the concept of ensemble time-local $H_{\\infty}$ filter (EnTLHF). We outline the general form of the EnTLHF, and discuss some of its special cases. In particular, we show that an EnKF with certain covariance inflation is essentially an EnTLHF. In this sense, the EnTLHF provides a general framework for conducting covariance inflation in the EnKF-based methods. We use some numerical examples to assess the relative robustness of the TLHF/EnTLHF in comparison with the corresponding KF/EnKF method.
Sebastian Schubert; Valerio Lucarini
2015-08-17T23:59:59.000Z
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.
Alberto Escalante
2006-07-13T23:59:59.000Z
Using a covariant and gauge invariant geometric structure constructed on the Witten covariant phase space for Dirac-Nambu-Goto bosonic p-branes propagating in a curved background, we find the canonically conjugate variables, and the relevant commutation relations are considered, as well as, we find the canonical variables for the Gauss-Bonnet topological term in string theory.
Small, Dylan
pretreatment covariates, perhaps by matching, a sensitivity analysis examines the impact of an unobserved and is more interpretable to subject matter experts. We will illustrate our method using data from the U perpetration of serious violence. Using data from Chicago and controlling for 153 pre-exposure covariates
Ryan, Sarah M.
Process and Continuous Monitoring Index terms--Optimal replacement, proportional hazards model, semi-Markovian covariate process, which we assume is under continuous monitoring. The form of an optimal policy-Markov process, threshold replacement policy, sensitivity analysis SUMMARY This paper deals with the optimal
Gottwald, Georg A.
Controlling Overestimation of Error Covariance in Ensemble Kalman Filters with Sparse Observations: A Variance-Limiting Kalman Filter GEORG A. GOTTWALD AND LEWIS MITCHELL School of Mathematics and Statistics of an ensemble Kalman filter when only partial observations are available is considered. In particular
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
Yuta Okubo; Francesco Buscemi; Akihisa Tomita
2008-06-11T23:59:59.000Z
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.
Deep-Sea Research II 48 (2001) 1823}1836 Covariation of mesoscale ocean color and sea-surface
McGillicuddy Jr., Dennis J.
2001-01-01T23:59:59.000Z
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
Tu, Kevin
, latent and carbon dioxide from eddy covariances presented by Kevin Tu, St. Louis (10/97). The properties
Computation of Large Covariance Matrices by SAMMY on Graphical Processing Units and Multicore CPUs
Arbanas, Goran [ORNL; Dunn, Michael E [ORNL; Wiarda, Dorothea [ORNL
2011-01-01T23:59:59.000Z
Computational power of Graphical Processing Units and multicore CPUs was harnessed by the nuclear data evaluation code SAMMY to speed up computations of large Resonance Parameter Covariance Matrices (RPCMs). This was accomplished by linking SAMMY to vendor-optimized implementations of the matrix-matrix multiplication subroutine of the Basic Linear Algebra Library to compute the most time-consuming step. The U-235 RPCM computed previously using a triple-nested loop was re-computed using the NVIDIA implementation of the subroutine on a single Tesla Fermi Graphical Processing Unit, and also using the Intel's Math Kernel Library implementation on two different multicore CPU systems. A multiplication of two matrices of dimensions 16,000 x 20,000 that had previously taken days, took approximately one minute on the GPU. Similar performance was achieved on a dual six-core CPU system. The magnitude of the speed-up suggests that these, or similar, combinations of hardware and libraries may be useful for large matrix operations in SAMMY. Uniform interfaces of standard linear algebra libraries make them a promising candidate for a programming framework of a new generation of SAMMY for the emerging heterogeneous computing platforms.
Non-Gaussianity of a single scalar field in general covariant Ho?ava-Lifshitz gravity
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Huang, Yongqing; Wang, Anzhong
2012-11-01T23:59:59.000Z
In this paper, we study non-Gaussianity generated by a single scalar field in slow-roll inflation in the framework of the nonrelativistic general covariant Horava-Lifshitz theory of gravity with the projectability condition and an arbitrary coupling constant ?, where ? characterizes the deviation of the theory from general relativity (GR) in the infrared. We find that the leading effect of self-interaction, contrary to the case of the minimal scenario of GR, is in general of the order ?ˆn?3/2, where ? is a slow-roll parameter, and ?ˆn(n=3,5) are the dimensionless coupling coefficients of the sixth-order operators of the Lifshitz scalar and have no contributions to power spectra and indices of both scalar and tensor. The bispectrum, comparing with the standard one given in GR, is enhanced and gives rise to a large value of the nonlinearity parameter fNL. We study how the modified dispersion relation with high order moment terms affects the evaluation of the mode function and in turn the bispectrum, and we show explicitly that the mode function takes various asymptotic forms during different periods of its evolution. In particular, we find that it is in general of superpositions of oscillatory functions, instead of plane waves like in the minimal scenario of GR. This results in a large enhancement of the folded shape in the bispectrum.
Estimated {sup 55}Mn and {sup 90}Zr Cross Section Covariances in the Fast Neutron Energy Region
Pigni, M.T. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)], E-mail: pigni@bnl.gov; Herman, M.; Oblozinsky, P. [National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)
2008-12-15T23:59:59.000Z
We completed estimates of neutron cross section covariances for {sup 55}Mn and {sup 90}Zr, from the keV energy range to 25 MeV, considering the most important reaction channels, total, elastic, inelastic, capture, and (n,2n). The nuclear reaction model code EMPIRE was used to calculate sensitivity to model parameters by a perturbation of parameters that define the optical model potential, nuclear level densities and strength of the pre-equilibrium emission. The sensitivity analysis was performed with the set of parameters which reproduces the ENDF/B-VII.0 cross sections. The experimental data were analyzed and both statistical and systematic uncertainties were extracted from almost 30 selected experiments. Then, the Bayesian code KALMAN was used to combine the sensitivity analysis and the experiments to obtain the evaluated covariance matrices.
Energy-dependent Lorentz covariant parameterization of the NN interaction between 50 and 200 MeV
Z. P. Li; G. C. Hillhouse; J. Meng
2007-12-03T23:59:59.000Z
For laboratory kinetic energies between 50 and 200 MeV, we focus on generating an energy-dependent Lorentz covariant parameterization of the on-shell nucleon-nucleon (NN) scattering amplitudes in terms of a number of Yukawa-type meson exchanges in first-order Born approximation. This parameterization provides a good description of NN scattering observables in the energy range of interest, and can also be extrapolated to energies between 40 and 300 MeV.
L. D Lantsman
2012-05-01T23:59:59.000Z
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.
Giuseppe Palmiotti; Massimo Salvatores
2014-04-01T23:59:59.000Z
The Working Party on International Nuclear Data Evaluation Cooperation (WPEC) of the Nuclear Science Committee under the Nuclear Energy Agency (NEA/OECD) established a Subgroup (called “Subgroup 33”) in 2009 on “Methods and issues for the combined use of integral experiments and covariance data.” The first stage was devoted to producing the description of different adjustment methodologies and assessing their merits. A detailed document related to this first stage has been issued. Nine leading organizations (often with a long and recognized expertise in the field) have contributed: ANL, CEA, INL, IPPE, JAEA, JSI, NRG, IRSN and ORNL. In the second stage a practical benchmark exercise was defined in order to test the reliability of the nuclear data adjustment methodology. A comparison of the results obtained by the participants and major lessons learned in the exercise are discussed in the present paper that summarizes individual contributions which often include several original developments not reported separately. The paper provides the analysis of the most important results of the adjustment of the main nuclear data of 11 major isotopes in a 33-group energy structure. This benchmark exercise was based on a set of 20 well defined integral parameters from 7 fast assembly experiments. The exercise showed that using a common shared set of integral experiments but different starting evaluated libraries and/or different covariance matrices, there is a good convergence of trends for adjustments. Moreover, a significant reduction of the original uncertainties is often observed. Using the a–posteriori covariance data, there is a strong reduction of the uncertainties of integral parameters for reference reactor designs, mainly due to the new correlations in the a–posteriori covariance matrix. Furthermore, criteria have been proposed and applied to verify the consistency of differential and integral data used in the adjustment. Finally, recommendations are given for an appropriate use of sensitivity analysis methods and indications for future work are provided.
Palmiotti, Giuseppe [Idaho National Lab. (INL), Idaho Falls, ID (United States); Salvatores, Massimo [Idaho National Lab. (INL), Idaho Falls, ID (United States); Aliberti, G. [Argonne National Lab. (ANL), Argonne, IL (United States)
2015-01-01T23:59:59.000Z
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.
S. J. van Enk
2013-03-25T23:59:59.000Z
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.
Roman G. Smirnov; Jin Yue
2004-08-03T23:59:59.000Z
The invariant theory of Killing tensors (ITKT) is extended by introducing the new concepts of covariants and joint invariants of (product) vector spaces of Killing tensors defined in pseudo-Riemannian spaces of constant curvature. The covariants are employed to solve the problem of classification of the orthogonal coordinate webs generated by non-trivial Killing tensors of valence two defined in the Euclidean and Minkowski planes. Illustrative examples are provided.
Cao H. Nam
2014-11-10T23:59:59.000Z
We consider the space-time at short distances in which it is described by a $D$-dimensional manifold (bulk) carrying out the principal bundle structure. As a result, this space-time manifold is foliated in the covariant way by the $(D-4)$-dimensional submanifolds, realized as the space-like internal spaces, that are smooth copies of the Lie group $G$ considered in this paper as the special unitary group. The submanifolds being transversal to the internal spaces are realized as the external spaces and in fact identified as the usual $4$-dimensional world. The fundamental degrees of freedom determining the geometrical dynamics of the bulk corresponding with short distance gravity are given by the gauge fields, the external metric field and the modulus fields setting dynamically the volume of the internal spaces. These gauge fields laying the bulk is to point precisely out the local directions of the external spaces which depend on the topological non-triviality of the space-time principal bundle. The physical size of the internal spaces is fixed dynamically by the moduli stabilization potential which completely arise from the intrinsic geometry of the bulk. A detail description of the low energy bulk gravity in the weak field limit is given around the classical ground state of the bulk. Additionally, we investigate the dynamics of the fundamentally $4$-dimensional Weyl spinor fields and the fields of carrying out the non-trivial representations of the Lie group $G$ propagating in the bulk in a detail study. These results suggest naturally the possible solutions to some the experimental problems of Standard Model, the smallness of the observed neutrino masses and a dark matter candidate.
Andrey Akhmeteli
2015-07-13T23:59:59.000Z
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.
Rutger van Haasteren; Michele Vallisneri
2014-07-24T23:59:59.000Z
Many data-analysis problems involve large dense matrices that describe the covariance of stationary noise processes; the computational cost of inverting these matrices, or equivalently of solving linear systems that contain them, is often a practical limit for the analysis. We describe two general, practical, and accurate methods to approximate stationary covariance matrices as low-rank matrix products featuring carefully chosen spectral components. These methods can be used to greatly accelerate data-analysis methods in many contexts, such as the Bayesian and generalized-least-squares analysis of pulsar-timing residuals.
N. I. Stoilova; J. Van der Jeugt
2010-04-14T23:59:59.000Z
A Gel'fand-Zetlin basis is introduced for the irreducible covariant tensor representations of the Lie superalgebra gl(m|n). Explicit expressions for the generators of the Lie superalgebra acting on this basis are determined. Furthermore, Clebsch-Gordan coefficients corresponding to the tensor product of any covariant tensor representation of gl(m|n) with the natural representation V ([1,0,...,0]) of gl(m|n) with highest weight (1,0,. . . ,0) are computed. Both results are steps for the explicit construction of the parastatistics Fock space.
K. Hagino; J. M. Yao
2015-04-15T23:59:59.000Z
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.
Salisbury, Donald; Sundermeyer, Kurt
2015-01-01T23:59:59.000Z
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...
J. M. Alarcón; J. Martin Camalich; J. A. Oller
2013-01-21T23:59:59.000Z
The pion-nucleon sigma term ($\\sigma_{\\pi N}$) is an observable of fundamental importance because embodies information about the internal scalar structure of the nucleon. Nowadays this quantity has triggered renewed interest because it is a key input for a reliable estimation of the dark matter-nucleon spin independent elastic scattering cross section. In this proceeding we present how this quantity can be reliably extracted by employing only experimental information with the use covariant baryon chiral perturbation theory. We also contrast our extraction with updated phenomenology related to $\\sigma_{\\pi N}$ and show how this phenomenology favours a relatively large value of $\\sigma_{\\pi N}$. Finally, we extract a value of $\\sigma_{\\pi N}=59(7)$ MeV from modern partial wave analyses data.
arXiv:1302.6994v1[astro-ph.CO]27Feb2013 Power Spectrum Super-Sample Covariance
Hu, Wayne
that underlies them. Its two-point correlation function or the Fourier-transformed counterpart, the power from the large-scale structure probes. The statistical precision of power spectrum measurementsarXiv:1302.6994v1[astro-ph.CO]27Feb2013 Power Spectrum Super-Sample Covariance Masahiro Takada
Giuseppe Palmiotti; Massimo Salvatores
2015-01-01T23:59:59.000Z
This paper aims to show the main diffrences between the COMMARA-2.0 and COMMARA-2.1 evaluated covariance data in the uncertainty estimation of integral parameters of interest for a large number of typical innovative fast neutron systems.
Donald Salisbury; Jürgen Renn; Kurt Sundermeyer
2015-08-06T23:59:59.000Z
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.
Zhuang, Qianlai [Purdue University; Law, Beverly E. [Oregon State University; Baldocchi, Dennis [University of California, Berkeley; Ma, Siyan [University of California, Berkeley; Chen, Jiquan [University of Toledo, Toledo, OH; Richardson, Andrew [Harvard University; Melillo, Jerry [Marine Biological Laboratory; Davis, Ken J. [Pennsylvania State University; Hollinger, D. [USDA Forest Service; Wharton, Sonia [University of California, Davis; Falk, Matthias [University of California, Davis; Paw, U. Kyaw Tha [University of California, Davis; Oren, Ram [Duke University; Katulk, Gabriel G. [Duke University; Noormets, Asko [North Carolina State University; Fischer, Marc [Lawrence Berkeley National Laboratory (LBNL); Verma, Shashi [University of Nebraska; Suyker, A. E. [University of Nebraska, Lincoln; Cook, David R. [Argonne National Laboratory (ANL); Sun, G. [USDA Forest Service; McNulty, Steven G. [USDA Forest Service; Wofsy, Steve [Harvard University; Bolstad, Paul V [University of Minnesota; Burns, Sean [University of Colorado, Boulder; Monson, Russell K. [University of Colorado, Boulder; Curtis, Peter [Ohio State University, The, Columbus; Drake, Bert G. [Smithsonian Environmental Research Center, Edgewater, MD; Foster, David R. [Harvard University; Gu, Lianhong [ORNL; Hadley, Julian L. [Harvard University; Litvak, Marcy [University of New Mexico, Albuquerque; Martin, Timothy A. [University of Florida, Gainesville; Matamala, Roser [Argonne National Laboratory (ANL); Meyers, Tilden [NOAA, Oak Ridge, TN; Oechel, Walter C. [San Diego State University; Schmid, H. P. [Indiana University; Scott, Russell L. [USDA ARS; Torn, Margaret S. [Lawrence Berkeley National Laboratory (LBNL)
2011-01-01T23:59:59.000Z
More accurate projections of future carbon dioxide concentrations in the atmosphere and associated climate change depend on improved scientific understanding of the terrestrial carbon cycle. Despite the consensus that U.S. terrestrial ecosystems provide a carbon sink, the size, distribution, and interannual variability of this sink remain uncertain. Here we report a terrestrial carbon sink in the conterminous U.S. at 0.63 pg C yr 1 with the majority of the sink in regions dominated by evergreen and deciduous forests and savannas. This estimate is based on our continuous estimates of net ecosystem carbon exchange (NEE) with high spatial (1 km) and temporal (8-day) resolutions derived from NEE measurements from eddy covariance flux towers and wall-to-wall satellite observations from Moderate Resolution Imaging Spectroradiometer (MODIS). We find that the U.S. terrestrial ecosystems could offset a maximum of 40% of the fossil-fuel carbon emissions. Our results show that the U.S. terrestrial carbon sink varied between 0.51 and 0.70 pg C yr 1 over the period 2001 2006. The dominant sources of interannual variation of the carbon sink included extreme climate events and disturbances. Droughts in 2002 and 2006 reduced the U.S. carbon sink by 20% relative to a normal year. Disturbances including wildfires and hurricanes reduced carbon uptake or resulted in carbon release at regional scales. Our results provide an alternative, independent, and novel constraint to the U.S. terrestrial carbon sink.
Matt Visser
2003-04-09T23:59:59.000Z
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''.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Neudecker, D.; Talou, P.; Kawano, T.; Smith, D. L.; Capote, R.; Rising, M. E.; Kahler, A. C.
2015-08-01T23:59:59.000Z
We present evaluations of the prompt fission neutron spectrum (PFNS) of ²³?Pu induced by 500 keV neutrons, and associated covariances. In a previous evaluation by Talou et al. 2010, surprisingly low evaluated uncertainties were obtained, partly due to simplifying assumptions in the quantification of uncertainties from experiment and model. Therefore, special emphasis is placed here on a thorough uncertainty quantification of experimental data and of the Los Alamos model predicted values entering the evaluation. In addition, the Los Alamos model was extended and an evaluation technique was employed that takes into account the qualitative differences between normalized model predicted valuesmore »and experimental shape data. These improvements lead to changes in the evaluated PFNS and overall larger evaluated uncertainties than in the previous work. However, these evaluated uncertainties are still smaller than those obtained in a statistical analysis using experimental information only, due to strong model correlations. Hence, suggestions to estimate model defect uncertainties are presented, which lead to more reasonable evaluated uncertainties. The calculated keff of selected criticality benchmarks obtained with these new evaluations agree with each other within their uncertainties despite the different approaches to estimate model defect uncertainties. The keff one standard deviations overlap with some of those obtained using ENDF/B-VII.1, albeit their mean values are further away from unity. Spectral indexes for the Jezebel critical assembly calculated with the newly evaluated PFNS agree with the experimental data for selected (n,?) and (n,f) reactions, and show improvements for high-energy threshold (n,2n) reactions compared to ENDF/B-VII.1.« less
A Generic Timing Model for Cyber-Physical Florian Kluge, Mike Gerdes, Florian Haas, Theo Ungerer
Ungerer, Theo
, for example, the crank shaft in a combustion engine. Certain angu- larities of the crank shaft raise
SecSens -Security Architecture for Wireless Sensor Networks Faruk Bagci, Theo Ungerer
Ungerer, Theo
of sensor boards. Keywords: wireless sensor network, security architec- ture, energy efficiency, multi between nodes enhances communication flexibility. Generally, sensor nodes have limited energy and re not be transferred to sensor networks. In recent years, the research was mainly focused on issues related to energy
Derrien, Herve [ORNL; Leal, Luiz C [ORNL; Larson, Nancy M [ORNL
2008-01-01T23:59:59.000Z
To obtain the resonance parameters in a single energy range up to 2.5 keV neutron energy and the corresponding covariance matrix, a reevaluation of 239Pu was performed with the analysis code SAMMY. The most recent experimental data were analyzed in the energy range thermal to 2.5 keV. The experimental data were renormalized, aligned on a common energy scale, and corrected for residual background. Average neutron transmission and cross sections calculated with the new resonance parameters were compared to the corresponding experimental data and to ENDF/B-VI.
Bryan, W A; Newell, W R; Sanderson, J H
2006-01-01T23:59:59.000Z
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.
W. A. Bryan; W. R. Newell; J. H. Sanderson; A. J. Langley
2006-10-10T23:59:59.000Z
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.
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)
2006-11-15T23:59:59.000Z
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.
J. M. Yao; L. S. Song; K. Hagino; P. Ring; J. Meng
2015-01-29T23:59:59.000Z
We report a systematic study of nuclear matrix elements (NMEs) in neutrinoless double-beta decays with a state-of-the-art beyond mean-field covariant density functional theory. The dynamic effects of particle-number and angular-momentum conservations as well as quadrupole shape fluctuations are taken into account with projections and generator coordinate method for both initial and final nuclei. The full relativistic transition operator is adopted to calculate the NMEs. The present systematic studies show that in most of the cases there is a much better agreement with the previous non-relativistic calculation based on the Gogny force than in the case of the nucleus $^{150}$Nd found in Song et al. [Phys. Rev. C 90, 054309 (2014)]. In particular, we find that the total NMEs can be well approximated by the pure axial-vector coupling term with a considerable reduction of the computational effort.
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
2015-07-01T23:59:59.000Z
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
Lewicki, Jennifer; Lewicki, J.L.; Fischer, M.L.; Hilley, G.E.
2007-10-15T23:59:59.000Z
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.
Wang, Weiguo; Davis, Kenneth J.
2008-09-03T23:59:59.000Z
We compare the contributions of unit source fluxes over a clear-cutting area in a forest and over the contiguous forested area to the eddy-covariance (EC) flux of CO2 measured at a tower standing in the center of the clearcut under daytime convective conditions. The large-eddy simulation (LES) technique is used to simulate the dispersion and transport of two conservative and passive tracers that are released from the clearcut and from the forested area, respectively. The time series of the LES-generated vertical velocity and the mixing ratios of both tracers on all the levels at the tower location are recorded every model time step during the last hour of each LES run; this somewhat mimics real EC flux measurements at the tower. The contribution of the unit surface flux over the clearcut relative to that over the forested area decreases exponentially with increasing measurement height, decreasing convective boundary layer depth, increasing atmospheric stability, and decreasing size of the clearcut. LES-derived results are fitted to an empirical relation and applied to flux measurements at the 447-m tall tower in Wisconsin, USA. The contribution of the unit flux over the clearcut on the EC flux measured at the 30-m level of the tower is larger than 50% of that over the forested area under most unstable conditions, while smaller than 2.5% at the 396-m level. Existing analytical footprint models are inappropriate to address the clearcut influence due to clearcut-induced heterogeneity of the turbulent flow in the tower area.
H. Mei; K. Hagino; J. M. Yao; T. Motoba
2015-04-20T23:59:59.000Z
We present a detailed formalism of the microscopic particle-rotor model for hypernuclear low-lying states based on a covariant density functional theory. In this method, the hypernuclear states are constructed by coupling a hyperon to low-lying states of the core nucleus, which are described by the generator coordinate method (GCM) with the particle number and angular momentum projections. We apply this method to study in detail the low-lying spectrum of $^{13}_{~\\Lambda}$C and $^{21}_{~\\Lambda}$Ne hypernuclei. We also briefly discuss the structure of $^{155}_{~~\\Lambda}$Sm as an example of heavy deformed hypernuclei. It is shown that the low-lying excitation spectrum with positive parity states of the hypernuclei, which are dominated by $\\Lambda$ hyperon in $s$-orbital coupled to the core states, are similar to that for the corresponding core states, while the electric quadrupole transition strength, $B(E2)$, from the 2$^+_1$ state to the ground state is reduced according to the mass number of the 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.
Extremal covariant measurements Giulio Chiribellaa
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
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
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
Systematically heterogeneous covariance in network gev models
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
Generalized score tests for missing covariate data
Jin, Lei
2009-05-15T23:59:59.000Z
. . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.2 The Case of the Selection Probability pi Being Known and ? Being Given . . . . . . . . . . . . . . . . . . . . . . 21 3.3 Parametric Setting . . . . . . . . . . . . . . . . . . . . . . 27 3.4 Semiparametric Setting... in Scharfstein, Rotnitzky, and Robins, 1999; Van der Laan and Robins, 2003, Ibrahim, Chen, Lipsitz, and Herring, 2005). Considering n independent observations, Robins et al. (1994) proposed the gen- eral weighted estimating equations (WEEs) U(?,pi...
Covariant Balance Laws in Continua with Microstructure
Arash Yavari; Jerrold E. Marsden
2008-11-13T23:59:59.000Z
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.
Estimating Vision Parameters Given Data with Covariances
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
CONSTRUCTION OF COVARIANCE MATRICES WITH A ...
2009-05-28T23:59:59.000Z
matrices is a first step in Monte Carlo studies of statistical inferences of misspecified models. We analyze ...... American Statistical Association, 81, 142-
$O(d,d)$-Covariant String Cosmology
M. Gasperini; G. Veneziano
1991-12-17T23:59:59.000Z
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.
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
MEDICAL ENGINEERING OVERVIEW AND LUNCHEON
; Theo- dore von Kármán Professor of Aeronau- tics and Mechanical Engineering arosakis@caltech.edu (626
Annales Geophysicae (2005) 23: 4753 SRef-ID: 1432-0576/ag/2005-23-47
Paris-Sud XI, Université de
2005-01-01T23:59:59.000Z
Frequency Active Auroral Research Program (HAARP) heating facility are analyzed. We propose a theo- retical
and the eddy-covariance system and meteorological station were
(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
Alternatives to traditional model comparison strategies for covariance structure models
Preacher, K. J.; Cai, Li; MacCallum, R. C.
2007-01-01T23:59:59.000Z
involving an extension of recently introduced methods to nested model scenarios. Following our discussion of power, we further explore the potential value of adopting a model selection approach that avoids hypoth- a105 ?Chapter3?Preacher? ? 2007/2/12 ? 15... is literally true, there is an obvious logical problem in testing the null hypothesis that a model fits data perfectly in the population. Yet, this is precisely the hypothesis tested by the popular LR test of model a105 ?Chapter3?Preacher? ? 2007/2/12 ? 15...
Ensemble Statistics and Error Covariance of a Rapidly Intensifying Hurricane
Rigney, Matthew C.
2010-01-16T23:59:59.000Z
and the underlying dynamics for the case of Hurricane Humberto. Using an Ensemble Kalman Filter (EnKF), a comparison of data assimilation results in Storm-centered and Eulerian coordinate systems is made. In addition, the extent of the non-Gaussianity of the model...
Mean and covariance matrix adaptive estimation for a weakly ...
2011-01-25T23:59:59.000Z
AMS 2000 subject classification: Primary: 62G05, 62M10; Secondary: 90C15. Key words and phrases: Adaptive estimation, weakly stationary process, stochastic ...
ENDF/B-VII.1 and its covariances
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
COMPUTATION OF COVARIANCE MATRICES FOR CONSTRAINED PARAMETER ESTIMATION PROBLEMS
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
Generally covariant quantum mechanics on noncommutative configuration spaces
Kopf, Tomas; Paschke, Mario [Mathematical Institute, Silesian University, Na Rybnicku 1, 74601 Opava (Czech Republic); Institut fuer Mathematik, Einsteinstrasse 62, 48149 Muenster (Germany)
2007-11-15T23:59:59.000Z
We generalize the previously given algebraic version of 'Feynman's proof of Maxwell's equations' to noncommutative configuration spaces. By doing so, we also obtain an axiomatic formulation of nonrelativistic quantum mechanics over such spaces, which, in contrast to most examples discussed in the literature, does not rely on a distinguished set of coordinates. We give a detailed account of several examples, e.g., C{sup {infinity}}(Q)xM{sub n}(C) which leads to non-Abelian Yang-Mills theories, and of noncommutative tori T{sub {theta}}{sup d}. Moreover, we examine models over the Moyal-deformed plane R{sub {theta}}{sup 2}. Assuming the conservation of electrical charges, we show that in this case the canonical uncertainty relation [x{sub k},x{sub l}]=ig{sub kl} with metric g{sub kl} is only consistent if g{sub kl} is constant.
Lorentz Covariant Spin-Grouping of Baryon Resonances
Kirchbach, M
1999-01-01T23:59:59.000Z
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.
Covariant Weyl quantization, symbolic calculus, and the product formula
Gunturk, Kamil Serkan
2006-08-16T23:59:59.000Z
]). This formulation has its roots in statistical mechanics where one has to deal with systems of very large degrees of freedom and a phase space probabilistic approach is needed. All one needs is a density function rho which carries information about the energy...]. Recalling the dangers of false interpretations of the quantization process, we should be careful when trying to interpret the reverse process of ?dequantization? [5]. Many quantum systems are found to have a discrete energy spectrum, whereas their classical...
Parameters’ Covariance in Neutron Time of Flight Analysis – Explicit Formulae
Odyniec, M. [NSTec; Blair, J. [NSTec
2014-12-01T23:59:59.000Z
We present here a method that estimates the parameters’ variance in a parametric model for neutron time of flight (NToF). The analytical formulae for parameter variances, obtained independently of calculation of parameter values from measured data, express the variances in terms of the choice, settings, and placement of the detector and the oscilloscope. Consequently, the method can serve as a tool in planning a measurement setup.
SST spatial anisotropic covariances from METOP-AVHRR data
Boyer, Edmond
of SST data to track, characterize and reconstruct mesoscale dynamics (cf. Klein et al. (2009); Isern et and modeling of mesoscale SST variability appears crucial to provide interpolation priors. The temporal)). However, to our knowledge, no study has explored thor- oughly at a global-scale these mesoscale spatial
Covariant Spectator Theory of np scattering: Deuteron Quadrupole Moment
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Gross, Franz
2015-01-01T23:59:59.000Z
The deuteron quadrupole moment is calculated using two CST model wave functions obtained from the 2007 high precision fits to np scattering data. Included in the calculation are a new class of isoscalar np interaction currents automatically generated by the nuclear force model used in these fits. The prediction for model WJC-1, with larger relativistic P-state components, is 2.5% smaller that the experiential result, in common with the inability of models prior to 2014 to predict this important quantity. However, model WJC-2, with very small P-state components, gives agreement to better than 1%, similar to the results obtained recently frommore »chiral effect field theory predictions to order next-to-next-to-next-to-leading order.« less
General Treatment of All 2d Covariant Models
W. Kummer
1996-12-06T23:59:59.000Z
General matterless models of gravity include dilaton gravity, arbitrary powers in curvature, but also dynamical torsion. They are a special class of "Poisson-sigma-models" whose solutions are known completely, together with their general global structure. Beside the ordinary black hole, arbitrary singularity structures can be studied. It is also possible to derive an action "backwards", starting from a given manifold. The role of conservation laws, Noether charge and the quantization have been investigated. Scalar and fermionic matter fields may be included as well.
Conserved Quasilocal Quantities and General Covariant Theories in Two Dimensions
W. Kummer; P. Widerin
1995-02-15T23:59:59.000Z
General matterless--theories in 1+1 dimensions include dilaton gravity, Yang--Mills theory as well as non--Einsteinian gravity with dynamical torsion and higher power gravity, and even models of spherically symmetric d = 4 General Relativity. Their recent identification as special cases of 'Poisson--sigma--models' with simple general solution in an arbitrary gauge, allows a comprehensive discussion of the relation between the known absolutely conserved quantities in all those cases and Noether charges, resp. notions of quasilocal 'energy--momentum'. In contrast to Noether like quantities, quasilocal energy definitions require some sort of 'asymptotics' to allow an interpretation as a (gauge--independent) observable. Dilaton gravitation, although a little different in detail, shares this property with the other cases. We also present a simple generalization of the absolute conservation law for the case of interactions with matter of any type.
Ensemble Statistics and Error Covariance of a Rapidly Intensifying Hurricane
Rigney, Matthew C.
2010-01-16T23:59:59.000Z
and the underlying dynamics for the case of Hurricane Humberto. Using an Ensemble Kalman Filter (EnKF), a comparison of data assimilation results in Storm-centered and Eulerian coordinate systems is made. In addition, the extent of the non-Gaussianity of the model...
Covariant Spectator Theory of np scattering: Deuteron Quadrupole Moment
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Gross, Franz
2015-01-01T23:59:59.000Z
The deuteron quadrupole moment is calculated using two CST model wave functions obtained from the 2007 high precision fits to np scattering data. Included in the calculation are a new class of isoscalar np interaction currents automatically generated by the nuclear force model used in these fits. The prediction for model WJC-1, with larger relativistic P-state components, is 2.5% smaller that the experiential result, in common with the inability of models prior to 2014 to predict this important quantity. However, model WJC-2, with very small P-state components, gives agreement to better than 1%, similar to the results obtained recently from chiral effect field theory predictions to order next-to-next-to-next-to-leading order.
A Brief Practical Guide to Eddy Covariance Flux
Noone, David
Emissions Greenhouse Gases Oil and Gas Industry Carbon Sequestration Environmental Monitoring G. Burba and D, network guidelines and journal papers. It is also intended to help students and researchers in the field - open pathLI-7700 CH4 gas analyzer 46 - enclosed LI-7200 gas analyzer 53 - closed-path LI-7000 gas
Conformally covariant boundary correlation functions with a quantum group
Kalle Kytölä; Eveliina Peltola
2014-10-23T23:59:59.000Z
Particular boundary correlation functions of conformal field theory are needed to answer some questions related to random conformally invariant curves known as Schramm-Loewner evolutions (SLE). In this article, we introduce a correspondence and establish its fundamental properties, which are used in companion articles for explicitly solving two such problems. The correspondence associates Coulomb gas type integrals to vectors in a tensor product representation of a quantum group, a q-deformation of the Lie algebra sl2. We show that desired properties of the functions are guaranteed by natural representation theoretical properties of the vectors.
Mean and Covariance Structure Analysis of Hierarchical Data
Bengt O. Muthén
2011-01-01T23:59:59.000Z
are g H d ' = ^ z ' ^ g ® »V S = symmetric d lNg where I N Ng ® £yz lNg ® 2w is an identity matrixof dimension N , l g + lNg lNg' ® N g is a unit vector of
Zhuang, Yu
1.500$ TNG CNG 32.884$ Hc cao hc: Hc phÃ vÃ l phÃ 14.653$ Chi phÃ sinh hot 9.750$ Bo him sc khe 1.500$ TNG CNG 24.571$ i hc K thut Texas Vn phÃ²ng ng kÃ½ nhp hc
Parceling the Picturesque: "Rural" Cemeteries and Urban Context
Wunsch, Aaron Vickers
2009-01-01T23:59:59.000Z
the Session of 1836-1837. Harrisburg, PA: Theo. Fenn, 1837.of an American City. Harrisburg, PA: Stackpole Books,the Session of 1836-1837 (Harrisburg: Theo. Fenn, 1837), 16.
Contributions `a l'analyse qualitative symbolique effective des syst`emes dynamiques;
Paris-Sud XI, Université de
wants to live." Letter to Theo van Gogh Nuenen, April 11 th, 1885 Vincent van Gogh tel-00458959,version1
AndWellness: An Open Mobile System for Activity and Experience Sampling
2011-01-01T23:59:59.000Z
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
Brown Adipose Tissue Quantification in Human Neonates Using Water-Fat Separated MRI
2013-01-01T23:59:59.000Z
Nguyen 2 , Theo G. M. van Erp 1 , Ana Guijarro 3 , FaribaJM, Entringer S, Nguyen A, van Erp TGM, Guijarro A, et al. (
COLLEGE OF SCIENCE Nanoscience
Crawford, T. Daniel
- consumer electronics, personal care products, clothing, and even solar panels. Nanoscience lies of profound theo- retical insights, advances in scientific in- strumentation, and massive computing power, we
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
The covariation of Northern Hemisphere summertime CO2 with surface temperature in boreal regions
2013-01-01T23:59:59.000Z
in the Community Earth System Model: evaluation anduncertainties in Earth system models and for diagnosing the
The production of temperature and salinity variance and covariance : implications for mixing
Schanze, Julian J. (Julian Johannes)
2013-01-01T23:59:59.000Z
Large-scale thermal forcing and freshwater fluxes play an essential role in setting temperature and salinity in the ocean. A number of recent estimates of the global oceanic freshwater balance as well as the global oceanic ...
Discrete time Markov gamma processes and time depen-dent covariates in survival analysis
Nieto Barajas, Luis E.
. Nieto-Barajas ITAM, Department of Statistics R´io Hondo 1 Mexico D.F. 01000, Mexico lnieto@itam.mx 1
Renormalization of composite operators in Yang-Mills theories using a general covariant gauge
Collins, J.C.; Scalise, R.J. (The Pennsylvania State University, Department of Physics, 104 Davey Laboratory, University Park, Pennsylvania 16802 (United States))
1994-09-15T23:59:59.000Z
Essential to QCD applications of the operator product expansion, etc., is a knowledge of those operators that mix with gauge-invariant operators. A standard theorem asserts that the renormalization matrix is triangular: Gauge-invariant operators have alien'' gauge-variant operators among their counterterms, but, with a suitably chosen basis, the necessary alien operators have only themselves as counterterms. Moreover, the alien operators are supposed to vanish in physical matrix elements. A recent calculation by Hamberg and van Neerven apparently contradicts these results. By explicit calculations with the energy-momentum tensor, we show that the problems arise because of subtle infrared singularities that appear when gluonic matrix elements are taken on shell at zero momentum transfer.
Analysis of formaldehyde fluxes above a Ponderosa Pine forest measured via eddy-covariance
Digangi, FABCDE
2011-01-01T23:59:59.000Z
Society. Karl, T. , Atmospheric Chemistry Division (ACD)Kim, S. , Atmospheric Chemistry Division (ACD) Turnipseed, A.A. , Atmospheric Chemistry Division (ACD) Mauldin,
Field-Failure Predictions Based on Failure-time Data with Dynamic Covariate Information
; Dynamic data; Lifetime data; Usage history, Warranty returns. 1 #12;1 Introduction 1.1 Background Modern products, such as automobiles, high-end copying machines, and smart phones. For products contain- ing ADCDs
On the Impossibility of Covariant Nonlocal "hidden" Variables in Quantum Physics
Nicolas Gisin
2010-02-06T23:59:59.000Z
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.
Brane structure from a scalar field in general covariant Horava-Lifshitz gravity
D. Bazeia; F. A. Brito; F. G. Costa
2015-02-03T23:59:59.000Z
In this paper we have considered the structure of the non-projectable Horava-Melby-Thompson (HMT) gravity to find braneworld scenarios. A relativistic scalar field is considered in the matter sector and we have shown how to reduce the equations of motion to first-order differential equations. In particular, we have studied thick brane solutions of both the dilatonic and Randall-Sundrum types.
Ship-based measurement of air-sea CO 2 exchange by eddy covariance
Miller, Scott D; Marandino, Christa A; Saltzman, Eric S
2010-01-01T23:59:59.000Z
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
GR USS-TYPE BOUNDS FOR THE COVARIANCE OF TRANSFORMED RANDOM VARIABLES
Colominas, Ignasi
Construcciones, Punta del Este, Uruguay. E-mail: megozcue@correo.um.edu.uy Luis Fuentes Garc´ia Departamento de M
Dimension Reduction and Covariance Structure for Multivariate Data, Beyond Gaussian Assumption
Maadooliat, Mehdi
2012-10-19T23:59:59.000Z
are based on the PCA, and thus may not work well when there is non-Gaussian structure in the data. To address this issue, a likelihood based data transformation method with a computationally efficient algorithm is developed. Also, a new multivariate...
Global covariation of carbon turnover times with climate in terrestrial ecosystems
2014-01-01T23:59:59.000Z
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
Eddy-Covariance and auxiliary measurements, NGEE-Barrow, 2012-2013
Torn, Margaret; Billesbach, Dave; Raz-Yaseef, Naama
2014-03-24T23:59:59.000Z
The EC tower is operated as part of the Next Generation Ecosystem Experiment-Arctic (NGEE) at Barrow, Alaska. The tower is collecting flux data from the beginning of the thaw season, early June, and until conditions are completely frozen, early November. The tower is equipped with a Gill R3-50 Sonic Anemometer, LI-7700 (CH4) sensor, a LI-7500A (CO2/H2O) sensor, and radiation sensors (Kipp and Zonen CNR-4 (four component radiometer), two LiCor LI-190 quantum sensors (PAR upwelling and downwelling), and a down-looking Apogee SI-111 infrared radiometer (surface temperature)). The sensors are remotely controlled, and communication with the tower allows us to retrieve information in real time.
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.
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 ...
Covariant Spectator Theory of np scattering: Deuteron magnetic moment and form factors
Gross, Franz L. [JLAB
2014-06-01T23:59:59.000Z
The deuteron magnetic moment is calculated using two model wave functions obtained from 2007 high precision fits to $np$ scattering data. Included in the calculation are a new class of isoscalar $np$ interaction currents which are automatically generated by the nuclear force model used in these fits. After normalizing the wave functions, nearly identical predictions are obtained: model WJC-1, with larger relativistic P-state components, gives 0.863(2), while model WJC-2 with very small $P$-state components gives 0.864(2) These are about 1\\% larger than the measured value of the moment, 0.857 n.m., giving a new prediction for the size of the $\\rho\\pi\\gamma$ exchange, and other purely transverse interaction currents that are largely unconstrained by the nuclear dynamics. The physical significance of these results is discussed, and general formulae for the deuteron form factors, expressed in terms of deuteron wave functions and a new class of interaction current wave functions, are given.
Six-Week Time Series Of Eddy Covariance CO2 Flux At Mammoth Mountain...
CO2 fluxes and the atmospheric parameters over a comparable time period. Energy balance closure was assessed by statistical regression of EC energy fluxes (sensible and...
Marsden, Jerrold
2009-01-01T23:59:59.000Z
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
Discussion of large covariance estimation by thresholding prin-cipal orthogonal complements
Shen, Haipeng
data. Journal of the American Statistical Association 103(483), 12811293. Shen, D., H. Shen, and J component of SigClust, which is very useful for testing statistical significance of clusters in high Statistical Society: Series B (Statistical Methodology) 67(3), 427444. Huang, H., Y. Liu, M. Yuan, and J. S
A covariant action principle for dissipative fluid dynamics: From formalism to fundamental physics
N. Andersson; G. L. Comer
2015-05-18T23:59:59.000Z
We present a new variational framework for dissipative general relativistic fluid dynamics. The model extends the convective variational principle for multi-fluid systems to account for a range of dissipation channels. The key ingredients in the construction are i) the use of a lower dimensional matter space for each fluid component, and ii) an extended functional dependence for the associated volume forms. In an effort to make the concepts clear, the formalism is developed in steps with the model example of matter coupled to heat considered at each level. Thus we discuss a model for heat flow, derive the relativistic Navier-Stokes equations and discuss why the individual dissipative stress tensors need not be spacetime symmetric. We argue that the new formalism, which notably does not involve an expansion away from an assumed equilibrium state, provides a conceptual breakthrough in this area of research and provide an ambitious list of directions in which one may want to extend it in the future. This involves an exciting set of problems, relating to both applications and foundational issues.
An analysis of Texas rainfall data and asymptotic properties of space-time covariance estimators
Li, Bo
2009-06-02T23:59:59.000Z
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...
Constraints on Covariant Horava-Lifshitz Gravity from frame-dragging experiment
Ninfa Radicella; Gaetano Lambiase; Luca Parisi; Gaetano Vilasi
2014-08-06T23:59:59.000Z
The effects of Horava-Lifshitz corrections to the gravito-magnetic field are analyzed. Solutions in the weak field, slow motion limit, referring to the motion of a satellite around the Earth are considered. The post-newtonian paradigm is used to evaluate constraints on the Horava-Lifshitz parameter space from current satellite and terrestrial experiments data. In particular, we focus on GRAVITY PROBE B, LAGEOS and the more recent LARES mission, as well as a forthcoming terrestrial project, GINGER.
Covariance Localization with the Diffusion-Based Correlation Models MAX YAREMCHUK
assumption underlying the technique. Computationally, the DL method is comparable with the NAL technique in several directions with the major objective to relax the spatial homogeneity assumption underlying multiple ensembles in the framework of the hierarchical ensemble filter technique. In the oil and gas
Six-Week Time Series Of Eddy Covariance Co2 Flux At Mammoth Mountain,
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a gHigh4-FD-a < RAPIDâ€Ž | RoadmapSolarSABRESinton Consulting Inc Jump to:Sistem Eco
Six-Week Time Series Of Eddy Covariance CO2 Flux At Mammoth Mountain,
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onsource History View New PagessourceRavenand Some InitialSissonville, West Virginia: Energy Resources JumpCalifornia-
BOOK REVIEWS 143 attention to covariate-conditioned average and quantile effects, along with as-
Krishnamoorthy, Kalimuthu
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 of commodity price changes. Three approaches were considered for modeling comovements in commodity prices
A general purpose program for the analysis of variance and the complete analysis of covariance
Strange, James Reid
1967-01-01T23:59:59.000Z
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...
Covariant energy-momentum and an uncertainty principle for general relativity
F. I. Cooperstock; M. J. Dupre
2014-10-07T23:59:59.000Z
We introduce a naturally-defined totally invariant spacetime energy expression for general relativity incorporating the contribution from gravity. The extension links seamlessly to the action integral for the gravitational field. The demand that the general expression for arbitrary systems reduces to the Tolman integral in the case of stationary bounded distributions, leads to the matter-localized Ricci integral for energy-momentum in support of the energy localization hypothesis. The role of the observer is addressed and as an extension of the special relativistic case, the field of observers comoving with the matter is seen to compute the intrinsic global energy of a system. The new localized energy supports the Bonnor claim that the Szekeres collapsing dust solutions are energy-conserving. It is suggested that in the extreme of strong gravity, the Heisenberg Uncertainty Principle be generalized in terms of spacetime energy-momentum.
6 DoF Appearance-based Object Localization with Local Covariant Features
Jaehne, Bernd
relevant objects and estimate their full 6 DoF pose. Whi- le this task is easily handled by men, it) and geometrical methods [24], which rely on the geometrical structure of objects (provi- ded by various sensor 2. One problem is the handling of correspondences from different views/sensors in an in- tegrated
Learning covariance dynamics for path planning of UAV sensors in a large-scale dynamic environment
How, Jonathan P.
This work addresses the problem of trajectory planning for UAV sensors taking measurements of a large nonlinear system to improve estimation and prediction of such a system. The lack of perfect knowledge of the global ...
Newton-Like Methods for Sparse Inverse Covariance Peder A. Olsen
Nocedal, Jorge
of Industrial Engineering and Managment Sciences, Northwestern University. § IBM Watson Research Center. 1 #12 Watson Research Center. Department of Computer Science, University of Colorado, Boulder. Department to efficiently compute the search direction and to avoid explicitly storing the Hessian. We show that quasi
Arroyo Negrete, Elkin Rafael
2007-04-25T23:59:59.000Z
balance errors of the updated phase(s), and limitations associated with non-Gaussian permeability distribution are some of the most critical problems of the EnKF. The use of larger ensemble size may mitigate some of these problems but are prohibitively...
Yip, Yeung
2011-08-08T23:59:59.000Z
parameters (permeability, relative permeability, initial water saturation, etc) are adjusted until the production history is matched using the updated reservoir model. However, this method of utilizing only one model does not help capture the full range...
Formation of hypernuclei in high energy reactions within a covariant transport model
T. Gaitanos; H. Lenske; U. Mosel
2009-04-14T23:59:59.000Z
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.
Christian Röken
2015-07-01T23:59:59.000Z
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.
A general purpose program for the analysis of variance and the complete analysis of covariance
Strange, James Reid
1967-01-01T23:59:59.000Z
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 (2 X . . ? X. . . ) /2 ~ 3 k=1 etc. for the AC, BC... TABLE 3. Ib a x b FACTORIAL Source A B AB Error SS = B + AB Description of Factors A = Treatments B = Cell repetitions 17 TABLE 3, 2a REPEATED OBSERVATIONS WITHIN A RANDOMIZED BLOCK Source A B Experimental Error Sampl ing Error TABLE 3...
Covariant propagator in AdS5 x S5 superspace
Peng Dai; Ru-Nan Huang; Warren Siegel
2010-02-10T23:59:59.000Z
We give an explicit superspace propagator for the chiral scalar field strength of 10D IIB supergravity on an AdS5 x S5 background. Because this space is conformally flat, the propagator is very simple, almost identical to that of flat space. We also give an explicit expansion over the Kaluza-Klein modes of S5. The fact that the full propagator is so much simpler suggests that, as in 2D conformal field theory, AdS/CFT calculations would be simpler without a mode expansion.
Entropy Production and Equilibrium Conditions of General-Covariant Spin Systems
Wolfgang Muschik; Horst-Heino von Borzeszkowski
2015-08-07T23:59:59.000Z
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.
An eddy covariance mesonet to measure the effect of forest age on landatmosphere exchange
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
Neurobiology of Aging xxx (2006) xxxxxx Structural MRI covariance patterns associated with normal
2006-01-01T23:59:59.000Z
.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
Ospina León, Juan Sebastián
2013-01-01T23:59:59.000Z
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
EFFICIENT BASIS CHANGE AND REGULARIZATION FOR SPARSE ...
2011-09-08T23:59:59.000Z
measurement error and noise. Let x? denote the minimizer of (17). Theo- .... [4] S. Becker, J. Bobin, and E.J. Cand`es. Nesta: A fast and accurate first-order ...
Revista General de Informacin y Documentacin ISSN: 1131-8635 2008, 18 375-380
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
AVERAGES ALONG POLYNOMIAL SEQUENCES IN DISCRETE NILPOTENT GROUPS: SINGULAR RADON TRANSFORMS
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
Liquidity Creates Money and Debt: An Intertemporal Linear Trading Post Model
Starr, Ross M.
2014-01-01T23:59:59.000Z
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:
Volume 258, number 3,4 PHYSICS LETTERS B 11 April 1991 Self-regenerating inflationary universe
Cotsakis, Spiros
Volume 258, number 3,4 PHYSICS LETTERS B 11 April 1991 Self-regenerating inflationary universe~scussion of self-regenerating, self-reproducing inflationary universe in the context of higher-order gravity theo
Causes of International Conflict
Tantiyavarong, Tahned
2013-01-01T23:59:59.000Z
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
Guillermo F. Rubilar; Yuri N. Obukhov; Friedrich W. Hehl
2002-03-25T23:59:59.000Z
We study the {\\em propagation of electromagnetic waves} in a spacetime devoid of a metric but equipped with a {\\em linear} electromagnetic spacetime relation $H\\sim\\chi\\cdot F$. Here $H$ is the electromagnetic excitation $({\\cal D},{\\cal H})$ and $F$ the field strength $(E,B)$, whereas $\\chi$ (36 independent components) characterizes the electromagnetic permittivity/permeability of spacetime. We derive analytically the corresponding Fresnel equation and show that it is always quartic in the wave covectors. We study the `Fresnel tensor density' ${\\cal G}^{ijkl}$ as (cubic) function of $\\chi$ and identify the leading part of $\\chi$ (20 components) as indispensable for light propagation. Upon requiring electric/magnetic reciprocity of the spacetime relation, the leading part of $\\chi$ induces the {\\em light cone} structure of spacetime (9 components), i.e., the spacetime metric up to a function. The possible existence of an Abelian {\\em axion} field (1 component of $\\chi$) and/or of a {\\em skewon} field (15 components) and their effect on light propagation is discussed in some detail. The newly introduced skewon field is expected to be T-odd and related to dissipation.
Georg A. Gottwald; Lewis Mitchell; Sebastian Reich
2011-08-30T23:59:59.000Z
We consider the problem of an ensemble Kalman filter when only partial observations are available. In particular we consider the situation where the observational space consists of variables which are directly observable with known observational error, and of variables of which only their climatic variance and mean are given. To limit the variance of the latter poorly resolved variables we derive a variance limiting Kalman filter (VLKF) in a variational setting. We analyze the variance limiting Kalman filter for a simple linear toy model and determine its range of optimal performance. We explore the variance limiting Kalman filter in an ensemble transform setting for the Lorenz-96 system, and show that incorporating the information of the variance of some un-observable variables can improve the skill and also increase the stability of the data assimilation procedure.
2009-01-01T23:59:59.000Z
estimates of annual carbon sequestration in a Sitka spruce (carbon cycling in a temperate forest: Radiocarbon-based estimates of residence times, sequestration
Jürgen Struckmeier
2013-03-26T23:59:59.000Z
The Lagrangians and Hamiltonians of classical field theory require to comprise gauge fields in order to be form-invariant under local gauge transformations. These gauge fields have turned out to correctly describe pertaining elementary particle interactions. In this paper, this principle is extended to require additionly the form-invariance of a classical field theory Hamiltonian under variations of the space-time curvature emerging from the gauge fields. This approach is devised on the basis of the extended canonical transformation formalism of classical field theory which allows for transformations of the space-time metric in addition to transformations of the fields. Working out the Hamiltonian that is form-invariant under extended local gauge transformations, we can dismiss the conventional requirement for gauge bosons to be massless in order for them to preserve the local gauge invariance.The emerging equation of motion for the curvature scalar turns out to be compatible with the Einstein equation in the case of a static gauge field. The emerging equation of motion for the curvature scalar R turns out to be compatible with that from a Proca system in the case of a static gauge field.
2007-01-01T23:59:59.000Z
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
2009-01-01T23:59:59.000Z
based and biometric estimates of ecosystem carbon balance S.Uncertainty of annual net ecosystem productivity estimatedand par- titioning of ecosystem respiration in a southern
2009-01-01T23:59:59.000Z
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.
2009-01-01T23:59:59.000Z
of this figure in the HTML. as GPP – NPP + Rh. Because theof this figure in the HTML. [ 39 ] Ideally the Ra/GPP and
Grigori Amosov
2006-09-09T23:59:59.000Z
Some new examples of quantum channels for which the infimum of the output entropy is additive under taking a tensor product of channels are given.
2007-01-01T23:59:59.000Z
biome comparison of daily light-use efficiency for grossNPP): analysis of differences in light absorptionand light-use efficiency. Global Change Biol. 5, Ruimy, A. ,
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
Goulden, ML; Munger, JW; Song-Miao, F; Daube, BC; Wofsy, SC
1996-01-01T23:59:59.000Z
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
Air-sea gas exchange of CO 2 and DMS in the North Atlantic by eddy covariance
Miller, Scott D; Marandino, Christa A; De Bruyn, Warren; Saltzman, Eric S; McCormick, C.
2009-01-01T23:59:59.000Z
measurements of the air/sea flux of dimethylsulfide over the2008a), Open ocean DMS air/sea fluxes over the eastern SouthE. S. Saltzman (2008b), DMS air/sea flux and gas transfer
A Lorentz Covariant Holoraumy-Induced "Gadget" From Minimal Off-Shell 4D, N = 1 Supermultiplets
Gates,, S J; Miller-Dickson, M D; Mondal, B A; Oskoui, A; Regmi, S; Ross, E; Shetty, R
2015-01-01T23:59:59.000Z
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.
Formulation d'un modle de covariance d'erreur d'bauche multivari pour l'assimilation
Â· Directement liÃ©es aux variables du modÃ¨le Â· Peu nombreuses Â· InÃ©galement rÃ©parties en espace et en temps
2009-01-01T23:59:59.000Z
in a southern boreal aspen forest, Agric. For. Meteorol. ,water balances of a boreal aspen forest, 1994 – 2003, Global
Neural network technology for automatic fracture detection in sonic borehole image data
Schnorrenberg, Frank Theo
1992-01-01T23:59:59.000Z
NEURAL NETWORK TECHNOLOGY FOR AUTOMATIC FRACTURE DETECTION IN SONIC BOREHOLE IMAGE DATA A Thesis by FRANK THEO SCHNORRENBERG Submitted to the Office of Graduate Studies of Texas A&M University tn partial fulfillment of the requirements... for the degree of MASTER OF SC1ENCE December 1992 Major Subject: Computer Science NEURAL NETWORK TECHNOLOGY FOR AUTOMATIC FRACTURE DETECTION IN SONIC BOREHOLE IMAGE DATA A Thesis by FRANK THEO SCHNORRENBERG Subnutted to the Office of Graduate Studies...
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
Lewicki, J.L.
2008-01-01T23:59:59.000Z
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,
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
Mallavarapu, Bravishwar
2013-01-01T23:59:59.000Z
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
Lee, Jaehoon
2009-01-01T23:59:59.000Z
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...
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 ...
nh Gi Thit Hi Ti Nguyn Thin Nhin Do S C Trn Du Deepwater Horizon
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
EVOLUTION SEMIGROUPS AND ROBUST STABILITY OF EVOLUTION OPERATORS ON BANACH SPACES
EVOLUTION SEMIGROUPS AND ROBUST STABILITY OF EVOLUTION OPERATORS ON BANACH SPACES Y. LATUSHKIN, S. MONTGOMERYSMITH, AND T. RANDOLPH Abstract. Using the theory of evolution semigroups, this paper investigatesmapping theo rem for evolution semigroups acting on vectorvalued functions on [0; 1) is proven first
Surface solitons in chirped photonic lattices Mario I. Molina,1,
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
Solution of the p(2 2) NiO(111) surface structure using direct methods
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
Potential energy curves for NO+ D. L. Albritton and A. L. Schmeltekopf
' 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
Surface-Based Analysis of Functional Magnetic Resonance Imaging Data
Thompson, Paul
Surface-Based Analysis of Functional Magnetic Resonance Imaging Data Theo G.M. van Erp1, Vikas Y School of Medicine, Los Angeles, CA 90095, USA Abstract. Surface-based visualization, atlases the integration of surface-based tech- niques with functional imaging data, combining surface-based nonlinear
K.-H. Spatschek Associate Editors
Screening Effect on Stellar Thermonuclear Fusion A. Y. Potekhin1,2 and G. Chabrier2,3 1 Ioffe Physical. In addition, we examine some recent unconventional theo- retical results on stellar thermonuclear fusionsA, Weinheim 1 Introduction Thermonuclear reactions play a crucial role in stellar evolution. Nuclear fusion
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
Paderborn, Universität
Aiming to bring together media scholars from the United States, Canada, and Germany, the conference of Paderborn, Germany Concept and Organisation: Hannelore Bublitz, Irina Kaldrack, Theo Röhle, Hartmut Winkler March 29 31, 2012 University of Paderborn, Germany Room B 3.231 #12;02:00 | Start / Introduction 02
INSTITUTE PHYSICS PUBLISHING JOURNAL OF PHYSICS MATHEMATICAL GENERAL
Bartsch, Thomas
--6978 S0305Â4470(03)58228Â2 The Kustaanheimo--Stiefel transformation geometric algebra Bartsch Institut ur Theoretische Physik UniversitË? Stuttgart, Stuttgart, Germany EÂmail: bartsch@theo1.physik which avoids singularity. 0305Â4470/03/256963+16$30.00 Â© Publishing Ltd Printed6964 Bartsch one
STUDY OF THE OSCILLATION CONDITION OF QUARTZ OSCILLATORS BY GYRATOR TRANSFORMATION
Paris-Sud XI, Université de
systems. This method is based on the transformation of the nonlinear circuit into a sum of linear circuits [5][6]. Then, the resulting linear circuit can be analyzed by graph theo- retical methods to analyze elec- tronic circuits are based on the well-known modified nodal analysis (MNA) method [7
2013-01-01T23:59:59.000Z
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
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
Xs are for Trajectory Evaluation, Booleans are for Theorem Proving
Melham, Tom
. Aagaard,1 Thomas F. Melham,2 John W. O'Leary1 1 Strategic CAD Labs 2 FATA Research Group Intel Corporation and model checkers. #12;M. D. Aagaard, T. F. Melham and J. W. O'Leary, `Xs are for Trajec- tory Evaluation. Melham, and J. W. O'Leary, `Xs are for Trajectory Evaluation, Booleans are for Theo- rem Proving
vol. 171, no. 2 the american naturalist february 2008 Factors Affecting the Evolution of Bleaching
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
Working Paper Series Semantic building blocks
Fernandez, Thomas
. These results then suggest several new, theo- retically grounded, research areas. 1 Introduction SubtreeWorking Paper Series Semantic building blocks in genetic programming Nicholas Freitag Mc and Teaching Rodney A. Briggs Library Volume 3 Number 2 December 12, 2007 Faculty and Student Research
1 One-Dimensional Magnetism Hans-Jurgen Mikeska1
Dragon, Norbert
for S=1/2 and biquadratic exchange for S=1 systems), with spin-orbital models and mixed spin in the critical and ordered phases. 1.1 Introduction The field of low-dimensional magnetism can be traced back of today's solid state physics. For the first 40 years this was an exclusively theoretical field. Theo
Routing for analog chip design at NXP semiconductors
Utrecht, Universiteit
Routing for analog chip design at NXP semiconductors Marjan van den Akker Theo Beelen Rob H.O. Box 80.089 3508 TB Utrecht The Netherlands #12;Routing for analog chip designs at NXP Semiconductors.1 NXP Semiconductors NXP Semiconductors N.V. (Nasdaq: NXPI) is a global semiconductor company and a long
Architectures for Hard Real-Time
Ungerer, Theo
Uhrig, Theo Ungerer1 Systems and Networking, University of Augsburg, Eichleitnerstr. 30, D-86159 of WCET 1 E-mail: {gerdes, wolf, zhang, uhrig, ungerer}@informatik.uni-augsburg.de 2 Multi-Core Execution international s.r.o. 2 Project work at University of Augsburg At University of Augsburg the main objectives
Response time distributions and network perturbation into product-form
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
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
September 1999 2131BOOK REVIEWS Ecology, 80(6), 1999, pp. 21312132
Thomas, Dave
's petroleum resources come from relic, pre-planetary sources. The prevailing theory of petroleum production theo- ries concerning the origins of petroleum hydrocarbons and the abundance of deep in the sediments of lakes and oceans. Thus, petroleum reserves should be found in sedimentary formations. Gold
Industrial Heat Pumps Using Solid/Vapor Working Fluids
Rockenfeller, U.
1986-01-01T23:59:59.000Z
of such complex compounds cover the entire t~mpera? ture range of interest up to approx~mately 350?C. Carnot Efficiencies of Heat Pumps Efficiencies for the convers].on of energy in heat pumps have their theo~etical limit in the Carnot efficiency. A Carnot...
Under consideration for publication in J. Fluid Mech. 1 A two species model of aeolian sand
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
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
Reduction of Ion Heating During Magnetic Reconnection by Large-Scale Effective C. C. Haggerty,
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
What is Concurrent Programming? Course Outline (Approximate) Evaluation & Deadlines Engineering 9869
Peters, Dennis
What is Concurrent Programming? Course Outline (Approximate) Evaluation & Deadlines Engineering 9869 Advanced Concurrent Programming Introduction Dennis Peters1 Fall 2007 1 Throughout this course I will be borrowing from Dr. Theo Norvell #12;What is Concurrent Programming? Course Outline (Approximate) Evaluation
Overcharging of Nanoparticles in Electrolyte Solutions Sathyajith Ravindran and Jianzhong Wu*
Wu, Jianzhong
. On the theoretical side, the limitations of the traditional PB approaches for repre- senting various electrostatic phenomenon is not supported by the classical electrostatic theories based on the Poisson- Boltzmann (PB from molecular simulations and experiments. More advanced statistical-mechanical theo- ries
Bulletin of the Seismological Society of America
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
Can photo excitations heal defects in carbon nanotubes? Yoshiyuki Miyamoto a,*, Savas Berber b
components by monitoring the response of carbon na- notubes with atomic vacancies to electronic excitations of electronic excitations in these nanostructures to be several orders of magnitude longer than in solids a concern about the perfor- mance and reliability of nanotube-based devices. Theo- retical studies showed
Evolution of an initially columnar vortex terminating normal to a no-slip wall
Lopez, John M.
Èdewadt-type spatially oscillatory boundary layer within the core region and a potential-like vortex boundary layer at large radii. The toroidal structure results from the interaction between these two boundary layers's theo- retical study only applied to the boundary layer formed away from the core, as have most other
Lidar fluorosensing of mineral oil spills on the sea surface
Oldenburg, Carl von Ossietzky Universität
be discriminated from heavy fuel, and from less harmful substances like fish oil or vegetable oil, Fig. 3, whichLidar fluorosensing of mineral oil spills on the sea surface Theo Hengstermann and Rainer Reuter Airborne .fluorosensor measurements over maritime oil spills show that this method enables a sensitive
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,Â§ C. Salem,Â¶ and D. SundkvistÂ¶ (Dated: August 10, 2009) The proton temperature anisotropy in the solar wind is known to be constrained by the theo
On Continuous Models of Computation: Towards Computing the Distance Between
Schellekens, Michel P.
with building formal, mathematical models both for aspects of the computational process and for features discuss this issue in Section 3.1. 6th Irish Workshop on Formal Methods (IWFM'03), eWiC, British Computer traditionally associated with computer science are logic and discrete mathematics, the latter including set theo
CONMOW: Condition Monitoring for Offshore Wind Farms
1 CONMOW: Condition Monitoring for Offshore Wind Farms Edwin Wiggelinkhuizen, Theo Verbruggen, Henk in practice the European project CONMOW (Condition Monitoring for Offshore Wind Farms) was started in November for Offshore Wind Farms) was started in November 2002. This paper briefly describes the CONMOW project approach
Supplemental Material Table 1. Stimuli for in-scanner task. Block Rhyme Task Stimuli
between brain activation and task performance (r = .008 ~ .23, p = .59 ~ .98). 2. Analyses of covariance
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
On the relationship between temperature and wind speed in the atmospheric surface layer
Pierrard, John Martin
1958-01-01T23:59:59.000Z
of Marfa~ Texas, on the grounds of an abandoned airport Small, widely separated areas of the . surface were overgrown with bunch grass~ which some- times reached a height of about 18 lachesis Generally, the terrain surrounding the observation site... height term appended, which are derived as approximations to theo- retically deduced forms, are utilired to account for departures of wind speed and temperature from logarithmic height dependence in the upper reaches of the surface layer...
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
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
JOURNAL OF SCIENCE & TECHNOLOGY No. 78A -2010 APPLICATION OF COMPUTATIONAL MODEL
Thomas, Brian G.
nng (tính theo % khi lng) mi v trí tính toán và s khuch tán ca ôxyt nhôm trong x lng là khâu quyt nh tc ca quá trình hòa tan. Tc hòa tan ca ôxyt nhôm trong x lng c xác nh da trên kt qu chy mô hình và quan n s hòa tan tp cht ôxyt nhôm vào x lng trong luyn thép. I. INTRODUCTION Modern technology makes
Electric-Magnetic Duality and WDVV Equations
B. de Wit; A. Marshakov
2001-06-11T23:59:59.000Z
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.
Ecosystem carbon dioxide fluxes after disturbance in forests of North America
2010-01-01T23:59:59.000Z
ecosystem studies of the C consequences of these management options using eddy covariance will con- tinue to provide valuable information
Characteristic hypersurfaces in a relativistic superfluid theory
B. Linet
1998-12-16T23:59:59.000Z
By discussing the Cauchy problem, we determine the covariant equation of the characteristic hypersurfaces in a relativistic superfluid theory.
Particle Energy Spectrum, Revisited from a Counting Statistics Perspective
Yuan, D., Marks, D. G., Guss, P. P.
2012-07-16T23:59:59.000Z
This document is a slide show type presentation of a new covariance estimation for gamma spectra and neutron cross section.
doc. RNDr. Arnost Komarek, Ph.D. Dept. of Probability and Mathematical Statistics
Komarek, Arnost
Data Cars2004 (subset) Data on vehicles that were on the U.S. market in 2004. Only non-hybrid cars. Categorical Covariates 1. One categorical covariate and one-way ANOVA Data Cars2004 (subset) 101520 Drive Data Cars2004 (subset) 101520 Drive Consumption[l/100km] front rear 4x4 8 V. Categorical Covariates 1
Sawa Manoff
2002-05-07T23:59:59.000Z
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.
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
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
Therapeutic Antibody Targeting of Individual Notch Receptors
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Therapeutic Antibody Targeting of Individual Notch Receptors
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Therapeutic Hypothermia: Protective Cooling Using Medical Ice Slurry |
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There appears to be some confusion regarding the purpose of the public meetings that the Department
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There are currently no significant reported user bugs with CAF.
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There are currently no significant reported user bugs with the GNU
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There are no Potlucks scheduled at this time
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Thermal Hydraulic Simulations, Error Estimation and Parameter
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Thermal Imaging Technique for Measuring Mixing of Fluids - Energy
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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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (MillionStructural Basis of WntSupportB 18B()The FiveRevisedThe vision of aTheos
Thermal Management Using Carbon Nanotubes - Energy Innovation Portal
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Thermal Model Development and Validation for 2010 Toyota Prius | Argonne
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Thermal Multi-layer Coating Analysis | Argonne National Laboratory
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Buettner, John Philip
1961-01-01T23:59:59.000Z
and encouragement on each of the problems that arose during the course of this investigation. Thanks are also due The Dow Chemical Company for their grant of three months education leave and for making poss- ible the availability of the necessary courses... on the composition of vapor, liquid and solid phases in equi- librium. The information 1s of great importance in both theo- ret1cal and industrial studies . Some of the fundamental theorems in chemical thermody- namics owe their existence to phase studies...
A review of "Poetry and the Making of the English Literary Past: 1660 – 1781." by Richard Terry
James Fitzmaurice
2003-01-01T23:59:59.000Z
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...
Dependence of the intrinsic spin-Hall effect on spin-orbit interaction character RID B-5617-2009
Nomura, K.; Sinova, Jairo; Sinitsyn, NA; MacDonald, AH.
2005-01-01T23:59:59.000Z
. DOI: 10.1103/PhysRevB.72.165316 PACS number?s?: 73.50.Fq, 72.10.?d, 73.21.?b I. INTRODUCTION Interest in spintronics1?6 has been heightened by the tech- nological impact of ferromagnetic metal-based devices and by ferromagnetic semiconductor... materials advances. Theo- retical attention has recently focused on spintronics effects in paramagnetic materials, and in particular on the spin-Hall ?SH? effect,7 in which an electric field induces a transverse spin current. Murakami et al.8 and Sinova...
Fast noise in the Landau-Zener theory RID B-5617-2009
Pokrovsky, Valery L.; Sinitsyn, NA.
2003-01-01T23:59:59.000Z
is the noise field with the correlation function ^hx(t1)hx(t2)&5Jx2e2lxut12t2u and s i are Pauli matrices. In the limit of infinitely short correlation time l?` Kayanuma has found a simple analytical result for the transition prob- ability. The choice... to the noise Jx50.28. Each discrete point represents the averaging over 100 simulations with the same coupling constants. The solid line is the graph of the theo- retical formula ~42!. The deviations of the simulation results from the analytical predictions...
Third Climate Change Science Program Report Issued; Report Details Effects
Office of Science (SC) Website
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (MillionStructural Basis of5,:,, ,CarlLauren SmithPeerResearchSelectingStephenDOETheofanisTheos
Thom H. Dunning, Jr, 1996 | U.S. DOE Office of Science (SC)
Office of Science (SC) Website
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (MillionStructural Basis of5,:,, ,CarlLauren SmithPeerResearchSelectingStephenDOETheofanisTheosThom
Basista, Jakub
2008-01-01T23:59:59.000Z
and current commentary on the vicissitudes of these women?s writing will appeal to specialists in the field. Martine Julia van Ittersum. Profit and Principle. Hugo Grotius, Natural Rughts Theories and the Rise of Dutch Power in the East Indies (1595...-European or non-Christian in- habitants. In her work Martine Julia van Ittersum presents Grotius as a theo- rist of rights and contract theories as well as a practitioner of those theories who acted as a negotiator and lawyer of Dutch colonialism and the VOC...
Multiple Contributors
1987-01-01T23:59:59.000Z
present course and speed, fifteen minutes, two point three seconds°" "Return fire, Scotty° We’ve got to buy time°" "Phasers fired, sir°" The weapons’ impact on the ships’s deflectors was greeted by a display of light, but no more tangible damage... They send "shills" around to buy up available copies, then they put said copies on sale for double the price the original editor asked for the~o While this is not illegal, it is certainly une~hical. Most fanzine editors want greater distribution...
Loi hnh trng: a ngnh, trng cng lp, i hc l trung tm nghin cu.
Hickman, Mark
chuyÃªn ngÃ nh t K toÃ¡n ti ng vt hc. S lng sinh viÃªn (nm 2012) Â· Tng s sinh viÃªn ng kÃ½ theo hc (% Sinh viÃªn ca New Zealand. Â· New Zealand lÃ t nc cÃ³ cht lng cuc sng cao c xp hng th nm trÃªn th gii (UNHDI, 2011 hng dn du lch hÃ ng u Lonely Planet. CÃ¡c xp hng quc t Â· c xp hng th 221 trong bng xp hng cht lng cÃ¡c
Neutrino-induced upward stopping muons in Super-Kamiokande
The Super-Kamiokande Collaboration
1999-12-01T23:59:59.000Z
A total of 137 upward stopping muons of minimum energy 1.6 GeV are observed by Super-Kamiokande during 516 detector live days. The measured muon flux is 0.39+/-0.04(stat.)+/-0.02(syst.)x10^{-13}cm^{-2}s^{-1}sr^{-1} compared to an expected flux of 0.73+/-0.16(theo.)x10^{-13}cm^{-2}s^{-1}sr^{-1}. Using our previously-published measurement of the upward through-going muon flux, we calculate the stopping/through-going flux ratio R}, which has less theoretical uncertainty. The measured value of R=0.22+/-0.02(stat.)+/-0.01(syst.) is significantly smaller than the value 0.37^{+0.05}_{-0.04}(theo.) expected using the best theoretical information (the probability that the measured R is a statistical fluctuation below the expected value is 0.39%). A simultaneous fitting to zenith angle distributions of upward stopping and through-going muons gives a result which is consistent with the hypothesis of neutrino oscillations with the parameters sin^2 2\\theta >0.7 and 1.5x10^{-3} Super-Kamiokande using the contained atmospheric neutrino events.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D. A.; Palano, A.; Pappagallo, M.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G.; Lynch, G.; Tackmann, K.; Koch, H.; Schroeder, T.; Asgeirsson, D. J.; Hearty, C.; Mattison, T. S.; McKenna, J. A.; Khan, A.; Blinov, V. E.; Buzykaev, A. R.; Druzhinin, V. P.; Golubev, V. B.; Kravchenko, E. A.; Onuchin, A. P.; Serednyakov, S. I.; Skovpen, Yu. I.; Solodov, E. P.; Todyshev, K. Yu.; Yushkov, A. N.; Bondioli, M.; Kirkby, D.; Lankford, A. J.; Mandelkern, M.; Stoker, D. P.; Atmacan, H.; Gary, J. W.; Liu, F.; Long, O.; Vitug, G. M.; Campagnari, C.; Hong, T. M.; Kovalskyi, D.; Richman, J. D.; West, C. A.; Eisner, A. M.; Kroseberg, J.; Lockman, W. S.; Martinez, A. J.; Schalk, T.; Schumm, B. A.; Seiden, A.; Cheng, C. H.; Doll, D. A.; Echenard, B.; Flood, K. T.; Hitlin, D. G.; Ongmongkolkul, P.; Porter, F. C.; Rakitin, A. Y.; Andreassen, R.; Dubrovin, M. S.; Huard, Z.; Meadows, B. T.; Sokoloff, M. D.; Sun, L.; Bloom, P. C.; Ford, W. T.; Gaz, A.; Nagel, M.; Nauenberg, U.; Smith, J. G.; Wagner, S. R.; Ayad, R.; Toki, W. H.; Spaan, B.; Kobel, M. J.; Schubert, K. R.; Schwierz, R.; Bernard, D.; Verderi, M.; Clark, P. J.; Playfer, S.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Fioravanti, E.; Garzia, I.; Luppi, E.; Munerato, M.; Negrini, M.; Petrella, A.; Piemontese, L.; Santoro, V.; Baldini-Ferroli, R.; Calcaterra, A.; de Sangro, R.; Finocchiaro, G.; Nicolaci, M.; Patteri, P.; Peruzzi, I. M.; Piccolo, M.; Rama, M.; Zallo, A.; Contri, R.; Guido, E.; Lo Vetere, M.; Monge, M. R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Bhuyan, B.; Prasad, V.; Lee, C. L.; Morii, M.; Edwards, A. J.; Adametz, A.; Marks, J.; Uwer, U.; Bernlochner, F. U.; Ebert, M.; Lacker, H. M.; Lueck, T.; Dauncey, P. D.; Tibbetts, M.; Behera, P. K.; Mallik, U.; Chen, C.; Cochran, J.; Meyer, W. T.; Prell, S.; Rosenberg, E. I.; Rubin, A. E.; Gritsan, A. V.; Guo, Z. J.; Arnaud, N.; Davier, M.; Grosdidier, G.; Le Diberder, F.; Lutz, A. M.; Malaescu, B.; Roudeau, P.; Schune, M. H.; Stocchi, A.; Wormser, G.; Lange, D. J.; Wright, D. M.; Bingham, I.; Chavez, C. A.; Coleman, J. P.; Fry, J. R.; Gabathuler, E.; Hutchcroft, D. E.; Payne, D. J.; Touramanis, C.; Bevan, A. J.; Di Lodovico, F.; Sacco, R.; Sigamani, M.; Cowan, G.; Brown, D. N.; Davis, C. L.; Denig, A. G.; Fritsch, M.; Gradl, W.; Hafner, A.; Prencipe, E.; Alwyn, K. E.; Bailey, D.; Barlow, R. J.; Jackson, G.; Lafferty, G. D.; Cenci, R.; Hamilton, B.; Jawahery, A.; Roberts, D. A.; Simi, G.; Dallapiccola, C.; Cowan, R.; Dujmic, D.; Sciolla, G.; Lindemann, D.; Patel, P. M.; Robertson, S. H.; Schram, M.; Biassoni, P.; Lazzaro, A.; Lombardo, V.; Neri, N.; Palombo, F.; Stracka, S.; Cremaldi, L.; Godang, R.; Kroeger, R.; Sonnek, P.; Summers, D. J.; Nguyen, X.; Taras, P.; De Nardo, G.; Monorchio, D.; Onorato, G.; Sciacca, C.; Raven, G.; Snoek, H. L.; Jessop, C. P.; Knoepfel, K. J.; LoSecco, J. M.; Wang, W. F.; Honscheid, K.; Kass, R.; Brau, J.; Frey, R.; Sinev, N. B.; Strom, D.; Torrence, E.; Feltresi, E.; Gagliardi, N.; Margoni, M.; Morandin, M.; Posocco, M.; Rotondo, M.; Simonetto, F.; Stroili, R.; Ben-Haim, E.; Bomben, M.; Bonneaud, G. R.; Briand, H.; Calderini, G.; Chauveau, J.; Hamon, O.; Leruste, Ph.; Marchiori, G.; Ocariz, J.; Sitt, S.; Biasini, M.; Manoni, E.; Pacetti, S.; Rossi, A.; Angelini, C.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Cervelli, A.; Forti, F.; Giorgi, M. A.; Lusiani, A.; Oberhof, B.; Paoloni, E.; Perez, A.; Rizzo, G.; Walsh, J. J.; Lopes Pegna, D.; Lu, C.; Olsen, J.; Smith, A. J. S.; Telnov, A. V.; Anulli, F.; Cavoto, G.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Gaspero, M.; Li Gioi, L.; Mazzoni, M. A.; Piredda, G.; Bünger, C.; Grünberg, O.; Hartmann, T.; Leddig, T.; Schröder, H.; Waldi, R.; Adye, T.; Olaiya, E. O.; Wilson, F. F.; Emery, S.; Hamel de Monchenault, G.; Vasseur, G.; Yèche, Ch.; Aston, D.; Bard, D. J.; Bartoldus, R.; Cartaro, C.; Convery, M. R.; Dorfan, J.; Dubois-Felsmann, G. P.; Dunwoodie, W.; Field, R. C.; Franco Sevilla, M.; Fulsom, B. G.; Gabareen, A. M.; Graham, M. T.; Grenier, P.; Hast, C.; Innes, W. R.; Kelsey, M. H.; Kim, H.; Kim, P.; Kocian, M. L.; Leith, D. W. G. S.; Lewis, P.; Li, S.; Lindquist, B.; Luitz, S.; Luth, V.; Lynch, H. L.; MacFarlane, D. B.; Muller, D. R.; Neal, H.; Nelson, S.; Ofte, I.; Perl, M.; Pulliam, T.; Ratcliff, B. N.; Roodman, A.; Salnikov, A. A.; Schindler, R. H.; Snyder, A.; Su, D.; Sullivan, M. K.; Va’vra, J.; Wagner, A. P.; Weaver, M.; Wisniewski, W. J.; Wittgen, M.; Wright, D. H.; Wulsin, H. W.; Yarritu, A. K.; Young, C. C.; Ziegler, V.; Park, W.; Purohit, M. V.; White, R. M.; Wilson, J. R.; Randle-Conde, A.; Sekula, S. J.; Bellis, M.; Benitez, J. F.; Burchat, P. R.
2012-08-01T23:59:59.000Z
We report measurements of partial branching fractions for inclusive charmless semileptonic B decays B¯¯¯?Xul?¯ and the determination of the Cabibbo–Kobayashi–Maskawa (CKM) matrix element |Vub|. The analysis is based on a sample of 467×10? ?(4S)?BB¯¯¯ decays recorded with the BABAR detector at the PEP-II e?e? storage rings. We select events in which the decay of one of the B mesons is fully reconstructed and an electron or a muon signals the semileptonic decay of the other B meson. We measure partial branching fractions ?B in several restricted regions of phase space and determine the CKM element |Vub| based on different QCD predictions. For decays with a charged lepton momentum p*l>1.0 GeV in the B meson rest frame, we obtain ?B=(1.80±0.13stat±0.15sys±0.02theo)×10?³ from a fit to the two-dimensional MX-q² distribution. Here, MX refers to the invariant mass of the final state hadron X and q² is the invariant mass squared of the charged lepton and neutrino. From this measurement we extract |Vub|=(4.33±0.24exp?±0.15theo)×10?³ as the arithmetic average of four results obtained from four different QCD predictions of the partial rate. We separately determine partial branching fractions for B¯¯¯0 and B? decays and derive a limit on the isospin breaking in B¯¯¯?Xul?¯ decays.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Martinelli, M.; Milanes, D. A.; Palano, A.; Pappagallo, M.; Eigen, G.; et al
2012-08-01T23:59:59.000Z
We report measurements of partial branching fractions for inclusive charmless semileptonic B decays B¯¯¯?Xul?¯ and the determination of the Cabibbo–Kobayashi–Maskawa (CKM) matrix element |Vub|. The analysis is based on a sample of 467×10? ?(4S)?BB¯¯¯ decays recorded with the BABAR detector at the PEP-II e?e? storage rings. We select events in which the decay of one of the B mesons is fully reconstructed and an electron or a muon signals the semileptonic decay of the other B meson. We measure partial branching fractions ?B in several restricted regions of phase space and determine the CKM element |Vub| based on different QCDmore »predictions. For decays with a charged lepton momentum p*l>1.0 GeV in the B meson rest frame, we obtain ?B=(1.80±0.13stat±0.15sys±0.02theo)×10?³ from a fit to the two-dimensional MX-q² distribution. Here, MX refers to the invariant mass of the final state hadron X and q² is the invariant mass squared of the charged lepton and neutrino. From this measurement we extract |Vub|=(4.33±0.24exp?±0.15theo)×10?³ as the arithmetic average of four results obtained from four different QCD predictions of the partial rate. We separately determine partial branching fractions for B¯¯¯0 and B? decays and derive a limit on the isospin breaking in B¯¯¯?Xul?¯ decays.« less
A new Lagrangian dynamic reduction in field theory
François Gay-Balmaz; Tudor S. Ratiu
2014-07-01T23:59:59.000Z
For symmetric classical field theories on principal bundles there are two methods of symmetry reduction: covariant and dynamic. Assume that the classical field theory is given by a symmetric covariant Lagrangian density defined on the first jet bundle of a principal bundle. It is shown that covariant and dynamic reduction lead to equivalent equations of motion. This is achieved by constructing a new Lagrangian defined on an infinite dimensional space which turns out to be gauge group invariant.
Seiberg-Witten maps and commutator anomalies in noncommutative electrodynamics
Banerjee, Rabin; Kumar, Kuldeep [S.N. Bose National Centre for Basic Sciences, JD Block, Sector 3, Salt Lake, Kolkata 700098 (India)
2005-10-15T23:59:59.000Z
We exploit the Seiberg-Witten maps for fields and currents in a U(1) gauge theory relating the noncommutative and commutative (usual) descriptions to obtain the O({theta}) structure of the commutator anomalies in noncommutative electrodynamics. These commutators involve the (covariant) current-current algebra and the (covariant) current-field algebra. We also establish the compatibility of the anomalous commutators with the noncommutative covariant anomaly through the use of certain consistency conditions derived here.
Age-dependent variation in the biophysical properties of boreal forests
McMillan, Andrew M. S.; Goulden, M. L.
2008-01-01T23:59:59.000Z
We thank Ed Read, Rob Elliot, Kelsie MacDuffee, and MarcyME, Read EL, Rocha AV, Elliot JR (2006) An eddy covariance
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...
Residential Use of Building Integrated Photo Voltaics
Balabadhrapatruni, Aswini
2012-07-16T23:59:59.000Z
in this model as co-variates. The results of this test indicate that both climatic zone and HDD have an effect on total energy savings....
An International Survey of Electric Storage Tank Water Heater Efficiency and Standards
Johnson, Alissa
2013-01-01T23:59:59.000Z
Covary, and Xia, “Energy Efficiency Country Study: Republicand Energy, “Energy Efficiency Strategy of the Republic ofin support of the Super-efficient Equipment and Appliance
The effects of mortality and health inequalities over disparities in political behavior
Rodriguez, Javier M.
2012-01-01T23:59:59.000Z
covariates related to survival. In theory, participation (3 In theory, by matching on the probability of survival, totheory equal for everyone) and to (2) the probability of survival
Functions and the Unity of Mathematics
1910-30-12T23:59:59.000Z
We examine the successes of Law of Vector Fields. We show how it gives a ...... of observers, then the covariant derivative a represents the field of ”gravitational.
Nonparametric methods for learning from data
Sajama
2006-01-01T23:59:59.000Z
Mixture discriminant analysis (MDA) [35] generalizes LDA bycommon covariance matrix. In MDA, like in LDA, all the meansdiscriminant analysis (MDA) [35] which generalizes LDA by
Energy Efficient Refrigerators Incentive Program Options for South Africa
Can, Stephane de la Rue du
2014-01-01T23:59:59.000Z
Covary, Unlimited Energy, South Africa and Paul Waide, WaideCA 94720 Unlimited Energy 2 South Africa Waide Strategicof refrigerator energy efficiency for South Africa. The
Residential Use of Building Integrated Photo Voltaics
Balabadhrapatruni, Aswini
2012-07-16T23:59:59.000Z
in this model as co-variates. The results of this test indicate that both climatic zone and HDD have an effect on total energy savings....
Introduction `a l'assimilation de donnees Mod`ele numerique du mod`ele d'ondes de crues
Â´eriences numÂ´eriques d'assimilation Matrices de covariance d'erreur Xt - Xb = b DÂ´etermination En tout point d'espace
Characterizing orbit uncertainty due to atmospheric uncertainty
Wilkins, Matthew Paul
2000-01-01T23:59:59.000Z
is implemented to model errors in the atmospheric density model. This study shows that the Kalman filter computes a believable and more realistic covariance....
OPAVAR : The Basics Based on version OPA8.2_VAR2.0
^^)(^ +=v kkk vGy 1- =),( 11 -- = kk G vy ,1 kkk vvv += - b vv =0 n The background error covariances
Sample size for logistic regression with small response probability
Whittemore, A S
1980-03-01T23:59:59.000Z
The Fisher information matrix for the estimated parameters in a multiple logistic regression can be approximated by the augmented Hessian matrix of the moment generating function for the covariates. The approximation is valid when the probability of response is small. With its use one can obtain a simple closed form estimate of the asymptotic covariance matrix of the maximum likelihood parameter estimates, and thus approximate sample sizes needed to test hypotheses about the parameters. The method is developed for selected distributions of a single covariate, and for a class of exponential-type distributions of several covariates. It is illustrated with an example concerning risk factors for coronary heart disease.
Vegetation and Waterfowl Response to Imazapyr-control of Alternanthera philoxeroides
Gray, Matthew
2 Logistics Late November-late February Survey 1x/week Sunrise-5 hours, Foraging, Inactive, Locomotion, Maintenance Covariates Disturbances
Closed string field theory in a-gauge
Masako Asano; Mitsuhiro Kato
2012-09-09T23:59:59.000Z
We show that a-gauge, a class of covariant gauges developed for bosonic open string field theory, is consistently applied to the closed string field theory. A covariantly gauge-fixed action of massless fields can be systematically derived from a-gauge-fixed action of string field theory.
Mach Learn (2009) 75: 167197 DOI 10.1007/s10994-009-5102-1
Igel, Christian
2009-01-01T23:59:59.000Z
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
Impact of access rates on the performance of networks
Ayesta, Urtzi
1 221111 21 1 221111 21 1 11 1 )()( )( ppppp p ppp p ppp p r #12;Covariance: C=1,r2=0.8 #12 class is binding · All covariances are positive 0 1 ** * * ppp p 0 1 **0000 0* 00* > + -= ii i i ppp p #12;Common class binding:r0=1,r2=0.05 #12;NS simulation
Alberto Escalante
2006-07-13T23:59:59.000Z
Using a strongly covariant formalism given by Carter for the deformations dynamics of p-branes in a curved background and a covariant and gauge invariant geometric structure constructed on the corresponding Witten's phase space, we identify the canonical variables for Dirac-Nambu-Goto [DNG] and Gauss-Bonnet [GB] system in string theory. Future extensions of the present results are outlined.
Influence of fundamental frequency on stop-consonant voicing perception
Holt, Lori L.
is that this perceptual pattern arises due to experience with f0/VOT covariation. To test the first hypothesis, chinchilla chinchilla results with no significant effect of f0. For the other groups, responses followed the experienced pattern of covariation. Coupled with the chinchilla data, these results suggest f0 does not exert
Spatial variability in soil heat flux at three Inner Mongolia steppe ecosystems
Chen, Jiquan
Spatial variability in soil heat flux at three Inner Mongolia steppe ecosystems Changliang Shao a-covariance Grassland Inner Mongolia a b s t r a c t Closing the energy budget at flux measurement sites is problematic system within the footprints of three Eddy-covariance towers located in the steppe of Inner Mongolia
Multiple Contributors
1982-01-01T23:59:59.000Z
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...
Machine Learning 10601 Recitation 6
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
This article was downloaded by:[University of Iowa Libraries] [University of Iowa Libraries
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
The University of Chicago Department of Statistics
Stephens, Matthew
. The propensity score, defined as the conditional probability of receiving treatment given pretreatment covariates pretreatment covariates. The effect of the treatment can then be evaluated on these groups of matched units using data from a pilot study for the media campaign evaluation. 12/13/01 #12;
Eect Modi...cation and Design Sensitivity in Observational Studies
Small, Dylan
adjusting for measured pretreatment covariates, perhaps by matching, a sensitivity analysis determines a treatment and a pretreatment covariate controlled by matching, so that the treatment e¤ect is larger at some discovered empirically in the data at hand. In case (i), subgroup speci...c bounds on P-values are combined
A MULTI-MICROPHONE BEAMFORMER WITH AN EIGENDOMAIN POST-FILTER Firas Jabloun and Beno^it Champagne
Champagne, BenoÃ®t
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
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
c n Trung Quc n n n n Malaysia n Nam Phi monash.edu Ti sao cn hc i hc?
Sekercioglu, Y. Ahmet
trong hai mi nm qua. CÃ¡c ngÃ nh ngh vÃ khÃ³a hc truyn thng Ã£ thay i vÃ danh sÃ¡ch cÃ¡c khÃ³a hc cng nh c hi sinh viÃªn hin ang theo hc cng lÃ mt ngun thÃ´ng tin tuyt vi tÃ¬m hiu v nhng la chn vÃ cuc sng ti trng i thÃ¡ng 9, mc dÃ¹ cÃ¡c hc sinh cng cÃ³ th np h s ngoÃ i thi gian nÃ y. VTAC cng lÃ ni con ca quÃ½ v cÃ³ th np n
Cc Qun tr Hng khng v Khng gian Quc gia Chng trnh H thng Khng phn
cu Ames NASA vÃ Trung tÃ¢m NghiÃªn cu Langley NASA--cng nh cng tÃ¡c vi ngÃ nh, gii hc vin vÃ cÃ¡c c quan sÃ¢n bay, trin khai vÃ mÃ¡y bay; vÃ Gim thi gian di chuyn cng nh nhng chm tr liÃªn quan n di chuyn. HÃ¬nh nh (Theo chiu kim ng h, t trÃ¡i sang phi) PhÃ²ng thÃ nghim Vn hÃ nh KhÃ´ng lu: PhÃ²ng thÃ nghim nÃ y, cng
The Super-Kamiokande Collaboration
1999-03-18T23:59:59.000Z
A total of 614 upward through-going muons of minimum energy 1.6 GeV are observed by Super-Kamiokande during 537 detector live days. The measured muon flux is 1.74+/-0.07(stat.)+/-0.02(sys.)x10^{-13}cm^{-2}s^{-1}sr^{-1} compared to an expected flux of 1.97+/-0.44(theo.)x10^{-13}cm^{-2}s^{-1}sr^{-1}. The absolute measured flux is in agreement with the prediction within the errors. However, the zenith angle dependence of the observed upward through-going muon flux does not agree with no-oscillation predictions. The observed distortion in shape is consistent with the \
Mauer, William A
1957-01-01T23:59:59.000Z
rash% in the Lower 4?oil? earn?4 N~F%~ whil? thea? r?ak?C in the lower qn?rtilo earn?4 $$, 984 Of the oi, vil ?ngin?o& yablie+?apl?~, thee? aek?d in the lower 4?oil??arn?4 $&, 640 whil? theo? r?nk?4 in tho lower quartile e?ra?4 Sgs~~ Xt weQ4?e?n Ad... Cees6ttee& y e sio i n lac Gal Su e 1 Qnl 0 yy+ ~ oonl4 be ?soared? A Qnoationnairo was oonposod) llsiJIg porta of 'ths one at@, 5. sed in the muley the National gooier of Professional Engineers? oonsisting bf Qlxootioaa pertain 1ng to eapl...
Breaking the challenge of signal integrity using time-domain spoof surface plasmon polaritons
Zhang, Hao Chi; Zhang, Qian; Fan, Yifeng; Fu, Xiaojian
2015-01-01T23:59:59.000Z
In modern integrated circuits and wireless communication systems/devices, three key features need to be solved simultaneously to reach higher performance and more compact size: signal integrity, interference suppression, and miniaturization. However, the above-mentioned requests are almost contradictory using the traditional techniques. To overcome this challenge, here we propose time-domain spoof surface plasmon polaritons (SPPs) as the carrier of signals. By designing a special plasmonic waveguide constructed by printing two narrow corrugated metallic strips on the top and bottom surfaces of a dielectric substrate with mirror symmetry, we show that spoof SPPs are supported from very low frequency to the cutoff frequency with strong subwavelength effects, which can be converted to the time-domain SPPs. When two such plasmonic waveguides are tightly packed with deep-subwavelength separation, which commonly happens in the integrated circuits and wireless communications due to limited space, we demonstrate theo...
Spline functions and extremal problems
Kmiecik, Dolores
1973-01-01T23:59:59.000Z
operation. THEOREM 1. 2. Let f, g I Ll such that f and g are even functions. Then f s g is an even function. PROOF. Applying the definition, f W g(-x) = $ f(-x-t)g(t)dt = S f(x+t)g(t)dt = Sf(T) g(T-x)dT $ f (T) g(x-T)dT el g + f(x) = f a g(x). THEO... define the Fourier transform of f, denoted by f as (4) f(x) = ( e f(t)dt. THEOREM 1. 4. Let f, g f Ll. Then PROOF. Applying (4), we have f ? g(x) = Ie (f + g) (t)? f + g(x) = $ e dt ( f(t-u)g(u)du $g(u)du I f(t-u)e dt 5 g(u)du j f(T)e ~ )dT 4 Sg...
The uncultured rich man in Dickens' late novels: Hard Times, Little Dorrit, and Our Mutual Friend.
Green, Marjorie Anne
1967-01-01T23:59:59.000Z
Ae tho, ~ 4ietanea ke lL. ~ looh ~ ?at of hie aarriage ?iadeo', it ia aevi in hie %Mrna that ihe aoaeter Mo haa breaght hia there hag let Cae light of Agp in oa theo? thinge', not ao4e or eoaeed thea, Xt oaa tho ]o~'e . fitting eng, aa4 sdjpat have... aeragtg dieooeod world ooae olzoet ae eoraona delivered botyoea the aota of a yXey aa ~elean ~ ineorte hia oM opinion of t' he develoywmt of SO%~a 5KllcL% an4 of the eoei~ that oolLld '%an W~ xiaboy". e aaet~vieoc %hag aaIo4 hia ee, ikexerabky, aa...
Synthesis and characterization of an n-butylphosphotriester of adenosine 3',5'-phosphate
Bracken, Christopher Andrew
1975-01-01T23:59:59.000Z
after 24 hr of normal rowih. ; = o', : EtUH, ' = 1% EtOH n, a. = not attempted I. e. = lost esperiment. 38 TABLE 7 Effect of cAMP-Bu on Glucose Production from Incubated Liver Slices* min EtOH Theo DBcAMP cAMP-Bu 15 107 122 100 73 30 104 118 93... Incubated in Modified Bicarbonate Buffer 5% EtOH solvent control ?- Theophylline 0. 2 mg/ml cAMP DBcAMP cAMP-Bu 5 x 10 M 5 x 10 M 5x10 M FiGURE 9 140 0 c ul 0 O +- 0 OP IfJ g 0 o 0 Ql E 120 100 80 time (hours) 41 FIGURE 10 Glucose...
Shahabi, Cyrus
d liu thuc cÃ¡c t chc, vÃ tÃnh cng tÃ¡c chia s d liu trong cÃ¡c nhÃ³m hay trong cÃ¡c lnh vc nghiÃªn cu, cng nh bÃ i toÃ¡n qun lÃ½ tÃ i liu in t trÃªn mng nÃ³i riÃªng. Trong bÃ i bÃ¡o nÃ y, chÃºng tÃ´i trÃ¬nh bÃ y Gii tÃ i liu, tÃ¬m kim, Ã¡nh ch mc, so khp vn bn... - Tng trÃ¬nh din: c trin khai theo mÃ´ hÃ¬nh cng thÃ´ng tin
A. Tamii; P. von Neumann-Cosel; I. Poltoratska
2013-10-02T23:59:59.000Z
The electric dipole (E1) response of 208Pb has been precisely determined by measuring Coulomb excitation induced by proton scattering at very forward angles. The electric dipole polarizability, defined as inverse energy-weighted sum rule of the E1 strength, has been extracted as 20.1+-0.6 fm^3. The data can be used to constrain the neutron skin thickness of 208Pb to 0.168(+-0.009)_expt(+-0.013)_theo(+-0.021)_est fm, where the subscript "expt" refers to the experimental uncertainty, "theor" to the theoretical confidence band and "est" to the uncertainty associated with the estimation of the symmetry energy at the saturation density. In addition, a constraint band has been extracted in the plane of the symmetry energy (J) and its slope parameter (L) at the saturation density.
Preparation, magnetic and optical properties of layered oxychalcogenides SmCuOCh (Ch = S or Se)
Llanos, Jaime [Departamento de Quimica, Universidad Catolica del Norte, Avda. Angamos 0610, Casilla 1280, Antofagasta (Chile)]. E-mail: jllanos@ucn.cl; Cortes, Rodrigo [Departamento de Quimica, Universidad Catolica del Norte, Avda. Angamos 0610, Casilla 1280, Antofagasta (Chile); Guizouarn, T. [Laboratoire de Chimie du Solide et Inorganique Moleculaire, UMR 6511-CNRS, Universite de Rennes 1-Institut de Chimie de Rennes, 35042 Rennes Cedex (France); Pena, Octavio [Laboratoire de Chimie du Solide et Inorganique Moleculaire, UMR 6511-CNRS, Universite de Rennes 1-Institut de Chimie de Rennes, 35042 Rennes Cedex (France)
2006-07-13T23:59:59.000Z
This paper reports on the synthesis and the electrical, magnetic and optical properties of SmCuOS and SmCuOSe. The magnetic properties reveal that Sm is in its 3+ oxidation state ({mu} {sup theo} = g{radical}J(J + 1) = 0.85 {mu}{sub B}; g = 2/7) with a large Van Vleck contribution, and exclude the possibility of a divalent oxidation state for samarium (Sm{sup 2+}; {sup 7}F{sub 0} state, g = J = 0, {mu} {sub eff} = 0). Optical properties were studied by means of diffuse reflectance and photoluminescence spectra in the UV-vis range. The electrical measurements show that the two samarium copper oxychalcogenides, SmCuOSe and SmCuOS are semiconductors with optical band gap (E {sub g}) values of 2.60 and 2.90 eV, respectively.
Lees, J.P.
2012-07-13T23:59:59.000Z
We report measurements of partial branching fractions for inclusive charmless semileptonic B decays {bar B} {yields} X{sub u}{ell}{bar {nu}}, and the determination of the CKM matrix element |V{sub ub}|. The analysis is based on a sample of 467 million {Upsilon}(4S) {yields} B{bar B} decays recorded with the BABAR detector at the PEP-II e{sup +}e{sup -} storage rings. We select events in which the decay of one of the B mesons is fully reconstructed and an electron or a muon signals the semileptonic decay of the other B meson. We measure partial branching fractions {Delta}{Beta} in several restricted regions of phase space and determine the CKM element |V{sub ub}| based on four different QCD predictions. For decays with a charged lepton momentum p*{sub {ell}} > 1.0 GeV in the B meson rest frame, we obtain {Delta}{Beta} = (1.80 {+-} 0.13{sub stat.} {+-} 0.15{sub sys.} {+-} 0.02{sub theo.}) x 10{sup -3} from a maximum likelihood fit to the two-dimensional M{sub X} - q{sup 2} distribution. Here, M{sub X} refers to the invariant mass of the final state hadron X and q{sup 2} is the invariant mass squared of the charged lepton and neutrino. From this measurement we extract |V{sub ub}| = (4.31 {+-} 0.25{sub exp.} {+-} 0.16{sub theo.}) x 10{sup -3} as the arithmetic average of four results obtained from four different QCD predictions of the partial rate. We separately determine partial branching fractions for {bar B}{sup 0} and B{sup -} decays and derive a limit on the isospin breaking in {bar B} {yields} X{sub u}{ell}{bar {nu}} decays.
Sample size in factor analysis: The role of model error
MacCallum, R. C.; Widaman, K. F.; Preacher, Kristopher J.; Hong, Sehee
2001-01-01T23:59:59.000Z
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...
Nonlinear Transformations and Filtering Theory for Space Operations
Weisman, Ryan Michael 1984-
2012-11-19T23:59:59.000Z
: Covariance Ele- ment Comparison of the EKF and TOV Bayes? Filter with Di erent Priors vs. the Numerical Covariance ( = 0:001rad) . . . . . . . . . 86 4.4 Arcing Mass Position and Velocity Measurement: Error for EKF and TOV Bayes? Filter with Di erent... Priors ( = 0:001rad) . . . . . . . 87 4.5 Arcing Mass Position and Velocity Measurement: Covariance Bounds for EKF and TOV Bayes? Filter with Di erent Priors ( = 0:001rad) 88 4.6 Arcing Mass Position and Velocity Measurement: Error and 3 Bounds...
Relationships between climate, vegetation, and energy exchange across a montane gradient
Anderson, Ray G.; Goulden, Michael L.
2011-01-01T23:59:59.000Z
Energy Balance platform and four eddy covariance towers. Wetower data show that precipitation timing is the largest control on energytower, maximum seasonal EF usually coincided with peak EVI, indicating that transpiration is a major fraction of energy
heavy-snowfall area. The annual NEP (net ecosystem productiv-
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
Partonic coalescence in relativistic heavy ion collisions
Greco, V.; Ko, Che Ming; Levai, P.
2003-01-01T23:59:59.000Z
Using a covariant coalescence model, we study hadron production in relativistic heavy ion collisions from both soft partons in the quark-gluon plasma and hard partons in minijets. Including transverse flow of soft partons and independent...
Method and system to estimate variables in an integrated gasification combined cycle (IGCC) plant
Kumar, Aditya; Shi, Ruijie; Dokucu, Mustafa
2013-09-17T23:59:59.000Z
System and method to estimate variables in an integrated gasification combined cycle (IGCC) plant are provided. The system includes a sensor suite to measure respective plant input and output variables. An extended Kalman filter (EKF) receives sensed plant input variables and includes a dynamic model to generate a plurality of plant state estimates and a covariance matrix for the state estimates. A preemptive-constraining processor is configured to preemptively constrain the state estimates and covariance matrix to be free of constraint violations. A measurement-correction processor may be configured to correct constrained state estimates and a constrained covariance matrix based on processing of sensed plant output variables. The measurement-correction processor is coupled to update the dynamic model with corrected state estimates and a corrected covariance matrix. The updated dynamic model may be configured to estimate values for at least one plant variable not originally sensed by the sensor suite.
Harms, Kyle E.
Variables 593 18 Generalized Additive Models 611 19 Mixed-Effects Models 627 20 Non-linear Regression 661 21 323 10 Regression 387 11 Analysis of Variance 449 12 Analysis of Covariance 489 13 Generalized Linear
Hawking Radiation as Tunneling: the D-dimensional rotating case
M. Nadalini; L. Vanzo; S. Zerbini
2005-11-24T23:59:59.000Z
The tunneling method for the Hawking radiation is revisited and applied to the $D$ dimensional rotating case. Emphasis is given to covariance of results. Certain ambiguities afflicting the procedure are resolved.
Measurement of advection and surface-atmosphere exchange in complex terrain.
Jones, Kevin H.
Accurate observations of the carbon cycle are essential as inputs to global climate models. Observations made by the micrometeorological technique of eddy covariance, whist widespread, may be incorrect if air is advected ...
Anisotropy in Gravity and Holography
Melby-Thompson, Charles Milton
2012-01-01T23:59:59.000Z
P. Ho?rava, and C. M. Melby-Thompson, Conformal LifshitzP. Ho?rava and C. M. Melby-Thompson, General Covariance inP. Ho?rava and C. M. Melby-Thompson, Anisotropic Conformal
On the Energy Momentum Tensor of the M-Theory Fivebrane
O. Baerwald; N. D. Lambert; P. C. West
1999-04-14T23:59:59.000Z
We construct the energy momentum tensor for the bosonic fields of the covariant formulation of the M-theory fivebrane within that formalism. We then obtain the energy for various solitonic solutions of the fivebrane equations of motion.
Application of robust statistics to asset allocation models
Zhou, Xinfeng
2006-01-01T23:59:59.000Z
Many strategies for asset allocation involve the computation of expected returns and the covariance or correlation matrix of financial instruments returns. How much of each instrument to own is determined by an attempt to ...
Exceptional field theory. II. E[subscript 7(7)
Hohm, Olaf
We introduce the exceptional field theory for the group E[subscript 7(7)], based on a (4+56)-dimensional spacetime subject to a covariant section condition. The “internal” generalized diffeomorphisms of the coordinates in ...
1 Ozone pollution forecasting 3 Herve Cardot, Christophe Crambes and Pascal Sarda.
Crambes, Christophe
Contents 1 Ozone pollution forecasting 3 Herv´e Cardot, Christophe Crambes and Pascal Sarda. 1 quantiles . . . . . . . . . . . . . . . 16 1.5 Application to Ozone prediction;1 Ozone pollution forecasting using conditional mean and conditional quantiles with functional covariates
Ochoa, Benjamin L.
2007-01-01T23:59:59.000Z
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
Application of Bayesian Hierarchical Models in Genetic Data Analysis
Zhang, Lin
2012-08-15T23:59:59.000Z
expression levels follow a Gaussian distribution. We derive the gene network structures by selecting covariance matrices of the Gaussian distribution with a hyper-inverse Wishart prior. We incorporate prior network models based on Gene Ontology information...
New approaches to higher-dimensional general relativity
Durkee, Mark N.
2011-06-07T23:59:59.000Z
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...
Kamph, Jerome Henri
2010-01-01T23:59:59.000Z
world applications using EnergyPlus J´ rˆ me Henri K¨ mpfalgorithm; application using EnergyPlus; Covariance MatrixBradley & Kummert, 2005) and EnergyPlus (ENE, 2009). When it
Developing Voices for Smart Homes: User Personality and Synthetic Voice Interaction
Boye, Greta
2007-11-28T23:59:59.000Z
Participants (n = 40) aged 27 through 76 years (M = 57.7, Mdn = 59.0) took part in a 2 (voice emotion) x 2 (message content) within subjects factorial design experiment with the between-subject covariates agreeableness and ...
Quantum Signatures of Spacetime Graininess Quantum Signatures of Spacetime
Quantum Field Theory on Noncommutative Spacetime Implementing Poincaré Symmetry Hopf Algebras, Drinfel Quantum Mechanics on Noncommutative Spacetime 4 Quantum Field Theory on Noncommutative Spacetime Covariant Derivatives and Field Strength Noncommutative Gauge Theories 6 Signatures of Spin
Gauging the twisted Poincare symmetry as a noncommutative theory of gravitation
Chaichian, M.; Tureanu, A. [Department of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki (Finland); Helsinki Institute of Physics, P.O. Box 64, FIN-00014 Helsinki (Finland); Oksanen, M. [Department of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki (Finland); Zet, G. [Department of Physics, 'Gh. Asachi' Technical University, Bd. D. Mangeron 67, 700050 Iasi (Romania)
2009-02-15T23:59:59.000Z
Einstein's theory of general relativity was formulated as a gauge theory of Lorentz symmetry by Utiyama in 1956, while the Einstein-Cartan gravitational theory was formulated by Kibble in 1961 as the gauge theory of Poincare transformations. In this framework, we propose a formulation of the gravitational theory on canonical noncommutative space-time by covariantly gauging the twisted Poincare symmetry, in order to fulfil the requirement of covariance under the general coordinate transformations, an essential ingredient of the theory of general relativity. It appears that the twisted Poincare symmetry cannot be gauged by generalizing the Abelian twist to a covariant non-Abelian twist, nor by introducing a more general covariant twist element. The advantages of such a formulation as well as the related problems are discussed and possible ways out are outlined.
Comparing Surface and Mid-Tropospheric CO2 Concentrations from Central U.S. Grasslands
Cochran, Ferdouz V.; Brunsell, Nathaniel A.; Mechem, David B.
2013-02-06T23:59:59.000Z
Comparisons of eddy covariance (EC) tower measurements of CO2 concentration with mid-tropospheric observations from the Atmospheric Infrared Sounder (AIRS) allow for evaluation of the rising global signal of this greenhouse gas in relation...
On Ergodic Secrecy Capacity for Gaussian MISO Wiretap Channels
Li, Jiangyuan
2010-01-01T23:59:59.000Z
A Gaussian multiple-input single-output (MISO) wiretap channel model is considered, where there exists a transmitter equipped with multiple antennas, a legitimate receiver and an eavesdropper each equipped with a single antenna. We study the problem of finding the optimal input covariance that achieves ergodic secrecy capacity subject to a power constraint where only statistical information about the eavesdropper channel is available at the transmitter. This is a non-convex optimization problem that is in general difficult to solve. Existing results address the case in which the eavesdropper or/and legitimate channels have independent and identically distributed Gaussian entries with zero-mean and unit-variance, i.e., the channels have trivial covariances. This paper addresses the general case where eavesdropper and legitimate channels have nontrivial covariances. A set of equations describing the optimal input covariance matrix are proposed along with an algorithm to obtain the solution. Based on this framew...
Lindsey, Charles D.
2011-08-08T23:59:59.000Z
standardization. This algorithm takes grouped multivariate data as input and then outputs a new coordinate space that contrasts the groups in location, scale, and covariance. The central goal of research is to develop a method to determine the dimension...
Rheumatic Heart Disease and Beta-hemolytic Streptococci in Salvador, Brazil: A Study of Slum Health
Tartof, Sara Yee
2010-01-01T23:59:59.000Z
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
Biomarkers of rapid chronic kidney disease progression in type 2 diabetes
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.
2015-07-22T23:59:59.000Z
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...
Original article Restricted maximum likelihood
Paris-Sud XI, Université de
Original article Restricted maximum likelihood estimation of covariances in sparse linear models on the simplex algorithm of Nelder and Mead [40]. Kovac [29] made modifications that turned it into a stable
Ecosystem fluxes of hydrogen: a comparison of flux-gradient methods
Meredith, Laura Kelsey
Our understanding of biosphere–atmosphere exchange has been considerably enhanced by eddy covariance measurements. However, there remain many trace gases, such as molecular hydrogen (H[subscript 2]), that lack suitable ...
Rooting and juvenile growth differences in half-sib seedlings of Gmelina arborea, Linn.
Hicks, Van Joseph
1980-01-01T23:59:59.000Z
variances and covariances in a natural population of doblolly pine (Pinus taeda L. ). Pub Ph. D. Dissertation, N. C. State University, Raleigh, N. C. 128 p. Stromquist, L. H. 1975. Propagation of Scots pine by. cuttings. Sveriges Skogsvardsforbunds...
Partonic coalescence in relativistic heavy ion collisions
Greco, V.; Ko, Che Ming; Levai, P.
2003-01-01T23:59:59.000Z
Using a covariant coalescence model, we study hadron production in relativistic heavy ion collisions from both soft partons in the quark-gluon plasma and hard partons in minijets. Including transverse flow of soft partons and independent...
Political Analysis (2011) 19:385-408 doi:10.1093/pan/mpr032
Sekhon, Jasjeet S.
2011-01-01T23:59:59.000Z
winners and bare losers in U.S. House elections (19422008) differ markedly on pretreatment covariates Jacobson, Keith Poole, and Jonathan Wand for sharing their data with us. We thank the editors
Interpretable conditions for identifying direct and indirect effects
California at Los Angeles, University of
are more appealing to data analysts. Unfortunately, these interpretations are laden with two other sources assignment is essentially random after adjusting for observed pretreatment covariates and that the assignment pretreatment
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 ...
Unions, Job Training, and the Wages of Foreign-Born Workers in the U.S.
Chen, Hung-Lin
2010-01-01T23:59:59.000Z
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
Star Products for Relativistic Quantum Mechanics
P. Henselder
2007-05-24T23:59:59.000Z
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.
Brunsell, Nathaniel A.; Wilson, Cassandra J.
2013-04-10T23:59:59.000Z
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 ...
Second Level Cluster Dependencies: A Comparison of Modeling Software and Missing Data Techniques
Larsen, Ross Allen Andrew
2011-10-21T23:59:59.000Z
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 ...
Bayesian Semiparametric Density Deconvolution and Regression in the Presence of Measurement Errors
Sarkar, Abhra
2014-06-24T23:59:59.000Z
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 ...
Late Emerging Reading Difficulties in English Language Learners
Garcia, Nicole Marie
2015-01-01T23:59:59.000Z
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
Sample size for logistic regression with small response probability. Technical report No. 33
Whittemore, A S
1980-03-01T23:59:59.000Z
The Fisher information matrix for the estimated parameters in a multiple logistic regression can be approximated by the augmented Hessian matrix of the moment generating function for the covariates. The approximation is valid when the probability of response is small. With its use one can obtain a simple closed-form estimate of the asymptotic covariance matrix of the maximum-likelihood parameter estimates, and thus approximate sample sizes needed to test hypotheses about the parameters. The method is developed for selected distributions of a single covariate, and for a class of exponential-type distributions of several covariates. It is illustrated with an example concerning risk factors for coronary heart disease. 2 figures, 2 tables.
Test particle motion in modified gravity theories
Mahmood Roshan
2013-02-05T23:59:59.000Z
We derive the equations of motion of an electrically neutral test particle for modified gravity theories in which the covariant divergence of the ordinary matter energy-momentum tensor dose not vanish (i.e. $\
Sidiropoulos, Nikolaos D.
(excitation-emission matrices, EEM) data in which concentration values for two analytes covary exactly to a constant, but differently in each of two modes. In the PARAFAC solutions of the EEM data, all factors
Generalized Gravity I : Kinematical Setting and reformalizing Quantum Field Theory
Johan Noldus
2008-04-20T23:59:59.000Z
The first part of this work deals with the development of a natural differential calculus on non-commutative manifolds. The second part extends the covariance and equivalence principle as well studies its kinematical consequences such as the arising of gauge theory. Furthermore, a manifestly causal and covariant formulation of quantum field theory is presented which surpasses the usual Hamiltonian and path integral construction. A particular representation of this theory on the kinematical structure developed in section three is moreover given.
Mesoscale predictability and background error convariance estimation through ensemble forecasting
Ham, Joy L
2002-01-01T23:59:59.000Z
MESOSCALE PREDICTABILITY AND BACKGROUND ERROR COVARIANCE ESTIMATION THROUGH ENSEMBLE FORECASTING A Thesis by JOY L. HAM Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 2002 Major Subject: Atmospheric Sciences MESOSCALE PREDICTABILITY AND BACKGROUND ERROR COVARIANCE ESTIMATION THROUGH ENSEMBLE FORECASTING A Thesis by JOY L. HAM Submitted to the Office of Graduate Studies...
Mesoscale predictability and background error convariance estimation through ensemble forecasting
Ham, Joy L
2002-01-01T23:59:59.000Z
MESOSCALE PREDICTABILITY AND BACKGROUND ERROR COVARIANCE ESTIMATION THROUGH ENSEMBLE FORECASTING A Thesis by JOY L. HAM Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 2002 Major Subject: Atmospheric Sciences MESOSCALE PREDICTABILITY AND BACKGROUND ERROR COVARIANCE ESTIMATION THROUGH ENSEMBLE FORECASTING A Thesis by JOY L. HAM Submitted to the Office of Graduate Studies...
Space-Time Models based on Random Fields with Local Interactions
Dionissios T. Hristopulos; Ivi C. Tsantili
2015-03-06T23:59:59.000Z
The analysis of space-time data from complex, real-life phenomena requires the use of flexible and physically motivated covariance functions. In most cases, it is not possible to explicitly solve the equations of motion for the fields or the respective covariance functions. In the statistical literature, covariance functions are often based on mathematical constructions. We propose deriving space-time covariance functions by solving "effective equations of motion", which can be used as statistical representations of systems with diffusive behavior. In particular, we propose using the linear response theory to formulate space-time covariance functions based on an equilibrium effective Hamiltonian. The effective space-time dynamics are then generated by a stochastic perturbation around the equilibrium point of the classical field Hamiltonian leading to an associated Langevin equation. We employ a Hamiltonian which extends the classical Gaussian field theory by including a curvature term and leads to a diffusive Langevin equation. Finally, we derive new forms of space-time covariance functions.
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)
2012-02-01T23:59:59.000Z
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.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Khachatryan, Vardan
2015-05-01T23:59:59.000Z
Properties of the Higgs boson with mass near 125 GeV are measured in proton-proton collisions with the CMS experiment at the LHC. Comprehensive sets of production and decay measurements are combined. The decay channels include ??, ZZ, WW, ??, bb, and ?? pairs. The data samples were collected in 2011 and 2012 and correspond to integrated luminosities of up to 5.1 fb?¹ at 7 TeV and up to 19.7 fb?¹ at 8 TeV. From the high-resolution ?? and ZZ channels, the mass of the Higgs boson is determined to be 125.02\\,+0.26-0.27(stat)+0.14-0.15(syst) GeV. For this mass value, the event yields obtainedmore »in the different analyses tagging specific decay channels and production mechanisms are consistent with those expected for the standard model Higgs boson. The combined best-fit signal relative to the standard model expectation is 1.00 ± 0.09 (stat), +0.08 -0.07 (theo) ± 0.07 (syst) at the measured mass. The couplings of the Higgs boson are probed for deviations in magnitude from the standard model predictions in multiple ways, including searches for invisible and undetected decays. No significant deviations are found.« less
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Khachatryan, Vardan
2014-10-27T23:59:59.000Z
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
DALIS: a computer-assisted document retrieval system for the FFTF
Harves, W G
1981-05-12T23:59:59.000Z
The FFTF (Fast Flux Test Facility) is a liquid sodium cooled, fast flux reactor designed specifically for irradiation testing of fuels and components for liquid metal fast breeder reactors. The Department of Energy and the Nuclear Regulatory Commission require that all pertinent documentation for maintenance, operation, and safety of the FFTF be readily accessible and retrievable, both during initial startup and for the lifetime of the plant. That amounts to a lot of information which has to be retrievable. The indexing system finally developed is called the DALIS system, short for Document and Location Indexing System. This system was designed by an engineer (Michael Theo) for use by engineers. DALIS uses descriptiors and keywords to identify each document in the system. The descriptors give such information as document number, date of issuance of the document, the title, the originating organization, and the microfilm or hardcopy location of the document. The keywords are words or phrases that describe the content of the document and permit retrieval by means of a computer search for documents with the stated keywords.
Khachatryan, Vardan [Yerevan Physics Institute (Armenia); et al.,
2014-10-27T23:59:59.000Z
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.
CMS Collaboration
2015-07-02T23:59:59.000Z
The inclusive jet cross section for proton-proton collisions at a centre-of-mass energy of 7 TeV was measured by the CMS Collaboration at the LHC with data corresponding to an integrated luminosity of 5.0 inverse femtobarns. The measurement covers a phase space up to 2 TeV in jet transverse momentum and 2.5 in absolute jet rapidity. The statistical precision of these data leads to stringent constraints on the parton distribution functions of the proton. The data provide important input for the gluon density at high fractions of the proton momentum and for the strong coupling constant at large energy scales. Using predictions from perturbative quantum chromodynamics at next-to-leading order, complemented with electroweak corrections, the constraining power of these data is investigated and the strong coupling constant at the Z boson mass M[Z] is determined to be alpha[S(M[Z])} = 0.1185 +/- 0.0019 (exp) +0.0060 -0.0037 (theo), which is in agreement with the world average.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Khachatryan, Vardan
2015-05-01T23:59:59.000Z
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
CMS Collaboration
2014-10-24T23:59:59.000Z
The inclusive jet cross section for proton-proton collisions at a centre-of-mass energy of 7 TeV was measured by the CMS Collaboration at the LHC with data corresponding to an integrated luminosity of 5.0 inverse femtobarns. The measurement covers a phase space up to 2 TeV in jet transverse momentum and 2.5 in absolute jet rapidity. The statistical precision of these data leads to stringent constraints on the parton distribution functions of the proton. The data provide important input for the gluon density at high fractions of the proton momentum and for the strong coupling constant at large energy scales. Using predictions from perturbative quantum chromodynamics at next-to-leading order, complemented with electroweak corrections, the constraining power of these data is investigated and the strong coupling constant at the Z boson mass M[Z] is determined to be alpha[S(M[Z])} = 0.1185 +/- 0.0019 (exp) +0.0060 -0.0037 (theo), which is in agreement with the world average.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Khachatryan, Vardan [Yerevan Physics Institute (Armenia); et al.,
2015-05-01T23:59:59.000Z
This paper presents a measurement of the inclusive 3-jet production differential cross section at a proton-proton centre-of-mass energy of 7 TeV using data corresponding to an integrated luminosity of 5 fb$^{-1}$ collected with the CMS detector. The analysis is based on the three jets with the highest transverse momenta. The cross section is measured as a function of the invariant mass of the three jets in a range of 445-3270 GeV and in two bins of the maximum rapidity of the jets up to a value of 2. A comparison between the measurement and the prediction from perturbative QCD at next-to-leading order is performed. Within uncertainties, data and theory are in agreement. The sensitivity of the observable to parameters of the theory such as the parton distribution functions of the proton and the strong coupling constant $\\alpha_S$ is studied. A fit to all data points with 3-jet masses larger than 664 GeV gives a value of the strong coupling constant of $\\alpha_S(M_\\mathrm{Z})$ = 0.1171 $\\pm$ 0.0013 (exp) $^{+0.0073}_{-0.0047}$ (theo).
Multi Jet Production at High Q2
Thomas Kluge
2005-10-31T23:59:59.000Z
Deep-inelastic $e^+p$ scattering data, taken with the H1 detector at HERA, are used to investigate jet production over a range of four-momentum transfers $150 < Q^2 < 15000 \\mathrm{GeV}^2$ and transverse jet energies $5 < E_T < 50 \\mathrm{GeV}$. The analysis is based on data corresponding to an integrated luminosity of $\\mathcal{L}_\\mathrm{int} = 65.4 \\mathrm{pb}^{-1}$ taken in the years 1999-2000 at a centre-of-mass energy $\\sqrt{s} \\approx 319 \\mathrm{GeV}$. Jets are defined by the inclusive $k_t$ algorithm in the Breit frame of reference. Dijet and trijet jet cross sections are measured with respect to the exchanged boson virtuality and in addition the ratio of the trijet to the dijet cross section $R_{3/2}$ is investigated. The results are compared to the predictions of perturbative QCD calculations in next-to-leading order in the strong coupling constant $\\alpha_s$. The value of $\\alpha_s(m_Z)$ determined from the study of $R_{3/2}$ is $\\alpha_s(m_Z) = 0.1175 \\pm 0.0017 (\\mathrm{stat.}) \\pm 0.0050 (\\mathrm{syst.}) ^{+0.0054}_{-0.0068} (\\mathrm{theo.})$.
Spectral diagonal ensemble Kalman filters
Kasanický, Ivan; Vejmelka, Martin
2015-01-01T23:59:59.000Z
A new type of ensemble Kalman filter is developed, which is based on replacing the sample covariance in the analysis step by its diagonal in a spectral basis. It is proved that this technique improves the aproximation of the covariance when the covariance itself is diagonal in the spectral basis, as is the case, e.g., for a second-order stationary random field and the Fourier basis. The method is extended by wavelets to the case when the state variables are random fields, which are not spatially homogeneous. Efficient implementations by the fast Fourier transform (FFT) and discrete wavelet transform (DWT) are presented for several types of observations, including high-dimensional data given on a part of the domain, such as radar and satellite images. Computational experiments confirm that the method performs well on the Lorenz 96 problem and the shallow water equations with very small ensembles and over multiple analysis cycles.
Erratum: A Comparison of Closures for Stochastic Advection-Diffusion Equations
Jarman, Kenneth D.; Tartakovsky, Alexandre M.
2015-01-01T23:59:59.000Z
This note corrects an error in the authors' article [SIAM/ASA J. Uncertain. Quantif., 1 (2013), pp. 319 347] in which the cited work [Neuman, Water Resour. Res., 29(3) (1993), pp. 633 645] was incorrectly represented and attributed. Concentration covariance equations presented in our article as new were in fact previously derived in the latter work. In the original abstract, the phrase " . . .we propose a closed-form approximation to two-point covariance as a measure of uncertainty. . ." should be replaced by the phrase " . . .we study a closed-form approximation to two-point covariance, previously derived in [Neuman 1993], as a measure of uncertainty." The primary results in our article--the analytical and numerical comparison of existing closure methods for specific example problems are not changed by this correction.
A Gibbs Sampler for Multivariate Linear Regression
Mantz, Adam B
2015-01-01T23:59:59.000Z
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...
Robert T. Thompson; Mohsen Fathi
2015-06-29T23:59:59.000Z
The fully covariant formulation of transformation optics is used to find the configuration of a cloaking device operating in an expanding universe modelled by a Friedmann-Lema\\^itre-Robertson-Walker spacetime. This spacetime cloak is used as a platform for probing the covariant formulation of transformation optics, thereby rigorously enhancing the conceptual understanding of the theory. By studying the problem in both comoving and physical coordinates we explicitly demonstrate the preservation of general covariance of electrodynamics under the transformation optics procedure. This platform also enables a detailed study of the various transformations that arise in transformation optics. We define a corporeal transformation as the "transformation" of transformation optics, and distinguish it from coordinate and frame transformations. We find that corporeal transformations considered in the literature have generally been restricted to a subset of all possible corporeal transformations, providing a potential mechanism for increased functionality of transformation optics.
Noncommutative (supersymmetric) electrodynamics in the Yang-Feldman formalism
Zahn, Jochen [Courant Research Centre 'Higher Order Structures in Mathematics', University of Goettingen, D-37073 Goettingen (Germany)
2010-11-15T23:59:59.000Z
We study quantum electrodynamics on the noncommutative Minkowski space (NCQED) in the Yang-Feldman formalism. Local observables are defined by using covariant coordinates. We compute the two-point function of the interacting field strength to second order and find the infrared divergent terms already known from computations using the so-called modified Feynman rules. It is shown that these lead to nonlocal renormalization ambiguities. Also new nonlocal divergences stemming from the covariant coordinates are found. Furthermore, we study the supersymmetric extension of the model. For this, the supersymmetric generalization of the covariant coordinates is introduced. We find that the nonlocal divergences cancel. At the one-loop level, the only effect of noncommutativity is then a momentum-dependent field strength normalization. We interpret it as an acausal effect and show that its range is independent of the noncommutativity scale.
The spinor field theory of the photon
Ruo Peng Wang
2011-09-18T23:59:59.000Z
I introduce a spinor field theory for the photon. The three-dimensional vector electromagnetic field and the four-dimensional vector potential are components of this spinor photon field. A spinor equation for the photon field is derived from Maxwell's equations,the relations between the electromagnetic field and the four-dimensional vector potential, and the Lorentz gauge condition. The covariant quantization of free photon field is done, and only transverse photons are obtained. The vacuum energy divergence does not occur in this theory. A covariant "positive frequency" condition is introduced for separating the photon field from its complex conjugate in the presence of the electric current and charge.
Projection operator approach to general constrained systems
Igor Batalin; Simon Lyakhovich; Robert Marnelius
2002-03-12T23:59:59.000Z
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.
Particle Energy Spectrum, Revisited from a Counting Statistics Perspective
None
2012-07-28T23:59:59.000Z
In nuclear science, gamma and neutron spectra are counted energy by energy, and then particle by particle. Until recently, few studies have been performed on how exactly those energy spectra are counted, or how those counts are correlated. Because of lack of investigation, cross section covariance and correlation matrices are usually estimated using perturbation method. We will discuss a statistical counting scheme that shall mimic the gamma and neutron counting process used in nuclear science. From this counting scheme, the cross section covariance and correlation can be statistically derived.
Undeformed (additive) energy conservation law in Doubly Special Relativity
Gianluca Mandanici
2008-11-11T23:59:59.000Z
All the Doubly Special Relativity (DSR) models studied in literature so far involve a deformation of the energy conservation rule that forces us to release the hypothesis of the additivity of the energy for composite systems. In view of the importance of the issue for a consistent formulation of a DSR statistical mechanics and a DSR thermodynamics, we show that DSR models preserving the usual (i.e. additive) energy conservation rule can be found. These models allow the construction of a DSR-covariant extensive energy. The implications of the analysis for the dynamics of DSR-covariant multiparticle systems are also briefly discussed.
Tensor distributions on signature-changing space-times
David Hartley; Robin W. Tucker; Philip A. Tuckey; Tevian Dray
1997-01-21T23:59:59.000Z
Irregularities in the metric tensor of a signature-changing space-time suggest that field equations on such space-times might be regarded as distributional. We review the formalism of tensor distributions on differentiable manifolds, and examine to what extent rigorous meaning can be given to field equations in the presence of signature-change, in particular those involving covariant derivatives. We find that, for both continuous and discontinuous signature-change, covariant differentiation can be defined on a class of tensor distributions wide enough to be physically interesting.
Wolfgang Muschik; Horst-Heino v. Borzeszkowski
2013-04-14T23:59:59.000Z
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.
Radon-Nikodym type theorem for {alpha}-completely positive maps
Heo, Jaeseong [Department of Mathematics, Research Institute for Natural Sciences, Hanyang University, Seoul 133-791 (Korea, Republic of); Ji, Un Cig [Department of Mathematics, Research Institute of Mathematical Finance, Chungbuk National University, Cheongju 361-763 (Korea, Republic of)
2010-10-15T23:59:59.000Z
We introduce a new notion of {alpha}-completely positive map on a C*-algebra as a generalization of the notion of completely positive map. Then we study a theorem of the Radon-Nikodym type that there is a one-to-one correspondence between {alpha}-completely positive maps and positive operators and, as an application of the Radon-Nikodym type theorem, we give a characterization of pure {alpha}-completely positive maps. Finally, we study a covariant version of the Stinespring's theorem for a covariant {alpha}-completely positive map (see Theorem 4.3).
Amand Faessler; G. L. Fogli; E. Lisi; V. Rodin; A. M. Rotunno; F. Simkovic
2009-03-06T23:59:59.000Z
The variances and covariances associated to the nuclear matrix elements (NME) of neutrinoless double beta decay are estimated within the quasiparticle random phase approximation (QRPA). It is shown that correlated NME uncertainties play an important role in the comparison of neutrinoless double beta decay rates for different nuclei, and that they are degenerate with the uncertainty in the reconstructed Majorana neutrino mass.
Does three dimensional electromagnetic field inherit the spacetime symmetries?
Cvitan, Maro; Smoli?, Ivica
2015-01-01T23:59:59.000Z
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.
A Gibbs sampler for inequality-constrained geostatistical interpolation and inverse modeling
Michalak, Anna M.
A Gibbs sampler for inequality-constrained geostatistical interpolation and inverse modeling Anna M. M. (2008), A Gibbs sampler for inequality-constrained geostatistical interpolation and inverse to inequality-constrained data and parameters. The approach is to be applicable with any variogram or covariance
Carbon Dioxide Exchange Between an Old-growth Forest and the
Chen, Jiquan
Carbon Dioxide Exchange Between an Old-growth Forest and the Atmosphere Kyaw Tha Paw U,1 * Matthias ABSTRACT Eddy-covariance and biometeorological methods show significant net annual carbon uptake in an old that old-growth forest eco- systems are in carbon equilibrium. The basis for differences between
Wigner functions, Fresnel optics, and symplectic connections on phase space
J. M. Isidro
2007-10-18T23:59:59.000Z
We prove that Wigner functions contain a symplectic connection. The latter covariantises the symplectic exterior derivative on phase space. We analyse the role played by this connection and introduce the notion of local symplectic covariance of quantum-mechanical states. This latter symmetry is at work in the Schroedinger equation on phase space.
Response of the global coupled climate model CLIMBER-3 to ENSO variability
Goelzer, Heiko
behaviour of the ZC leads to phases of constant El Nino with following enhanced THC strength. #12; in the Nino3 region as simulated by ZC (black) and forced in C3a (red). The coupling parameters have been chosen to minimize the RMS between ZC and C3a in the entire ZC region. Covariance of Nino3 and SOI
Oak Openings and Conservation EEES 4750: Conservation Biology
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
Siegel's formula via Stein's identities Department of Statistics
Liu, Jun
Siegel's formula via Stein's identities Jun S. Liu Department of Statistics Harvard University Abstract Inspired by a surprising formula in Siegel (1993), we find it convenient to compute covariances, even for order statistics, by using Stein (1972)'s identities. Generalizations of Siegel's formula
ON THE CONTINUITY OF ORNSTEIN-UHLENBECK PROCESSES IN
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
PROBLEMS IN BROWNIAN MOTION 1. Gaussian processes -necessary conditions for continuous version. Let
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
An Adjoint-Based Adaptive Ensemble Kalman Filter
Song, Hajoon
A new hybrid ensemble Kalman filter/four-dimensional variational data assimilation (EnKF/4D-VAR) approach is introduced to mitigate background covariance limitations in the EnKF. The work is based on the adaptive EnKF ...
Control and Intelligent Systems, Vol. 35, No. 2, 2007 REDUCED ORDER KALMAN FILTERING
Simon, Dan
Control and Intelligent Systems, Vol. 35, No. 2, 2007 REDUCED ORDER KALMAN FILTERING WITHOUT MODEL REDUCTION D. Simon* Abstract This paper presents an optimal discrete time reduced order Kalman filter of the estimation error covariance. Key Words Kalman filter, state estimatioh, order reduction 1. Introduction
Detection of Broken Bars in Induction Motors Using an Extended Kalman Filter
Paris-Sud XI, Université de
Detection of Broken Bars in Induction Motors Using an Extended Kalman Filter for Rotor Resistance and currents are processed by an Extended Kalman Filter for the speed and rotor resistance simultaneous bars. In the proposed extended Kalman Filter approach, the state covariance matrix is adequacy weighted
Kalman filtering with unknown inputs via optimal state estimation of singular systems
Paris-Sud XI, Université de
1 Kalman filtering with unknown inputs via optimal state estimation of singular systems M. DAROUACH de Lorraine, 54400 COSNES ET ROMAIN, FRANCE A new method for designing a Kalman filter for linear the Kalman filter, it is generally assumed that all system parameters, noise covariances, and inputs
Dependent Gaussian Processes Phillip Boyle and Marcus Frean
Frean, Marcus
in non-linear regression [8, 18], extended to handle classification tasks [11, 17, 6], and used to handle multiple, coupled outputs. 1 Introduction Gaussian process regression has many desirable covariance functions is to treat GPs as the outputs of stable linear filters. For a linear filter, the output