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1

Publications  

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

Greg Leventis [Clear All Filters] Greg Leventis [Clear All Filters] 2013 de la Rue du Can, Stephane, Virginie E. Letschert, Greg Leventis, Theo Covary, and Xiaohua Xia. Energy Efficiency Country Study: Republic Of South Africa. Lawrence Berkeley National Laboratory, 2013. de la du Can, Stephane Rue, Amol Phadke, Greg Leventis, and Anand R. Gopal. A Global Review of Incentive Programs to Accelerate Energy-Efficient Appliances and Equipment., 2013. Leventis, Greg, Anand R. Gopal, Stephane Rue de la du Can, and Amol Phadke. Avoided Electricity Subsidy Payments Can Finance Substantial Appliance Efficiency Incentive Programs: Case Study of Mexico., 2013. de la du Can, Stephane Rue, Virginie E. Letschert, Greg Leventis, Theo Covary, and Xiaohua Xia. Energy Efficiency Country Study: Republic Of South

2

Theo Brandsma KNMI, the Netherlands  

E-Print Network [OSTI]

Theo Brandsma KNMI, the Netherlands International workshop on the digitization of historical Possible codes Digitization and quality control #12;13 · Digitization and quality control Example page #12

Stoffelen, Ad

3

Theo Jansen  

Science Journals Connector (OSTI)

Kunst ist nicht gleich Architektur. Aber in manchen Fällen und Situationen haben sie ähnliche Ziele und Auswirkungen. Im Freien ausgestellte Skulpturen haben mit der Bauwelt viel gemein: Es sind ein Standort, ...

Robert Kronenburg

2008-01-01T23:59:59.000Z

4

Extremal covariant POVM's  

E-Print Network [OSTI]

We consider the convex set of positive operator valued measures (POVM) which are covariant under a finite dimensional unitary projective representation of a group. We derive a general characterization for the extremal points, and provide bounds for the ranks of the corresponding POVM densities, also relating extremality to uniqueness and stability of optimized measurements. Examples of applications are given.

Giulio Chiribella; Giacomo Mauro D'Ariano

2004-06-30T23:59:59.000Z

5

Geodesic Lines, . . . Covariant . . .  

E-Print Network [OSTI]

Geodesic Lines, . . . Covariant . . . Home Page Title Page Page 781 of 818 Go Back Full Screen Close Quit 14.11. Geodesic Lines, Local Gauss-Bonnet Theorem Geodesics play a very important role in surface theory and in dynamics. One of the main reasons why geodesics are so important

Gallier, Jean

6

Extremal covariant measurements  

SciTech Connect (OSTI)

We characterize the extremal points of the convex set of quantum measurements that are covariant under a finite-dimensional projective representation of a compact group, with action of the group on the measurement probability space which is generally nontransitive. In this case the POVM density is made of multiple orbits of positive operators, and, in the case of extremal measurements, we provide a bound for the number of orbits and for the rank of POVM elements. Two relevant applications are considered, concerning state discrimination with mutually unbiased bases and the maximization of the mutual information.

Chiribella, Giulio; Mauro D'Ariano, Giacomo [Istituto Nazionale di Fisica della Materia, Unita di Pavia, Dipartimento di Fisica 'A. Volta', via Bassi 6, I-27100 Pavia (Italy) and Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois 60208 (United States)

2006-09-15T23:59:59.000Z

7

Extremal covariant measurements  

E-Print Network [OSTI]

We characterize the extremal points of the convex set of quantum measurements that are covariant under a finite-dimensional projective representation of a compact group, with action of the group on the measurement probability space which is generally non-transitive. In this case the POVM density is made of multiple orbits of positive operators, and, in the case of extremal measurements, we provide a bound for the number of orbits and for the rank of POVM elements. Two relevant applications are considered, concerning state discrimination with mutually unbiased bases and the maximization of the mutual information.

G. Chiribella; G. M. D'Ariano

2006-03-20T23:59:59.000Z

8

Extremal covariant measurements Giulio Chiribellaa  

E-Print Network [OSTI]

Extremal covariant measurements Giulio Chiribellaa and Giacomo Mauro D'Arianob Istituto Nazionale characterize the extremal points of the convex set of quantum measurements that are covariant under a finite operators, and, in the case of extremal measurements, we provide a bound for the number of orbits

D'Ariano, Giacomo Mauro

9

Covariance and sensitivity data generation at ORNL  

Science Journals Connector (OSTI)

......parameter covariance generation. In this paper...retroactive covariance generation approach for the gadolinium...COVARIANCE DATA GENERATION IN SAMMY Over the...quality of the basic nuclear data. Thermal reactor designs and applications......

L. C. Leal; H. Derrien; N. M. Larson; A. Alpan

2005-12-20T23:59:59.000Z

10

Effect of theo-polyphenols ( ) on function of trans-membranous signal system of acute ischemic myocardium in rats) on function of trans-membranous signal system of acute ischemic myocardium in rats  

Science Journals Connector (OSTI)

Objective...: To observe the effect of theo-polyphenols (TP) on function of trans-membranous signal of acute ischemic myocardium in rats.Methods...: Model of myocardial ischemia was established. ...

Ke Yongsheng; Liu Zhaofang; Zhao Zhendong

1999-09-01T23:59:59.000Z

11

Beta-ensembles with covariance  

E-Print Network [OSTI]

This thesis presents analytic samplers for the [beta]-Wishart and [beta]-MANOVA ensembles with diagonal covariance. These generalize the [beta]-ensembles of Dumitriu-Edelman, Lippert, Killip-Nenciu, Forrester-Rains, and ...

Dubbs, Alexander

2014-01-01T23:59:59.000Z

12

Covariance evaluation work at LANL  

SciTech Connect (OSTI)

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.

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

13

Covariant description of isothermic surfaces  

E-Print Network [OSTI]

We present a covariant formulation of the Gauss-Weingarten equations and the Gauss-Mainardi-Codazzi equations for surfaces in 3-dimensional curved spaces. We derive a coordinate invariant condition on the first and second fundamental form which is necessary and sufficient for the surface to be isothermic.

Tafel, Jacek

2014-01-01T23:59:59.000Z

14

Covariant description of isothermic surfaces  

E-Print Network [OSTI]

We present a covariant formulation of the Gauss-Weingarten equations and the Gauss-Mainardi-Codazzi equations for surfaces in 3-dimensional curved spaces. We derive a coordinate invariant condition on the first and second fundamental form which is necessary and sufficient for the surface to be isothermic.

Jacek Tafel

2014-10-16T23:59:59.000Z

15

Covariance Evaluation Methodology for Neutron Cross Sections  

SciTech Connect (OSTI)

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.

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

16

ISSUES IN NEUTRON CROSS SECTION COVARIANCES  

SciTech Connect (OSTI)

We review neutron cross section covariances in both the resonance and fast neutron regions with the goal to identify existing issues in evaluation methods and their impact on covariances. We also outline ideas for suitable covariance quality assurance procedures.We show that the topic of covariance data remains controversial, the evaluation methodologies are not fully established and covariances produced by different approaches have unacceptable spread. The main controversy is in very low uncertainties generated by rigorous evaluation methods and much larger uncertainties based on simple estimates from experimental data. Since the evaluators tend to trust the former, while the users tend to trust the latter, this controversy has considerable practical implications. Dedicated effort is needed to arrive at covariance evaluation methods that would resolve this issue and produce results accepted internationally both by evaluators and users.

Mattoon, C.M.; Oblozinsky,P.

2010-04-30T23:59:59.000Z

17

Subsidiary Conditions in Covariant Theories  

Science Journals Connector (OSTI)

We have investigated the effect that coordinate conditions and similar conditions will have on the formal properties of covariant theories. Two distinct types of coordinate conditions were included, those involving first derivatives of the field variables (such as the gauge condition of Lorentz and the coordinate conditions of De Donder) and those algebraic in the field variables (of which the Coulomb gauge is an example).We have found that with either type of coordinate condition we can construct a variational principle, or a Hamiltonian formalism, which leads to physically meaningful field equations if associated with appropriate initial conditions on a space-like hypersurface. Thus the existence of a properly set Cauchy problem is always assured.It had been found previously that the infinitesimal invariant transformations of covariant theories form a group and that the coordinate (and similar) transformations represent a normal subgroup. The members of the resulting factor group are in one-to-one correspondence with the true observables of the theory, those dynamical variables which alone possess intrinsic significance without reference to a particular frame of description and whose commutator algebra is presumably reflected in the commutators of the corresponding Hilbert operators of the quantized theory. In this paper we have established the appropriate transformation groups (and their subgroups and factor groups) of a theory with either type of coordinate conditions. We have found that in any of these versions the theory will yield the same observables with the same commutator algebra. One may therefore hope that a quantization scheme based on a theory with subsidiary conditions will be free of the arbitrariness involved in the choice of particular conditions.

Peter G. Bergmann and Allen I. Janis

1958-08-15T23:59:59.000Z

18

Covariance Analysis of Gamma Ray Spectra  

SciTech Connect (OSTI)

The covariance method exploits fluctuations in signals to recover information encoded in correlations which are usually lost when signal averaging occurs. In nuclear spectroscopy it can be regarded as a generalization of the coincidence technique. The method can be used to extract signal from uncorrelated noise, to separate overlapping spectral peaks, to identify escape peaks, to reconstruct spectra from Compton continua, and to generate secondary spectral fingerprints. We discuss a few statistical considerations of the covariance method and present experimental examples of its use in gamma spectroscopy.

Trainham, R.; Tinsley, J.

2013-01-01T23:59:59.000Z

19

Extremal covariant quantum operations and POVM's  

E-Print Network [OSTI]

We consider the convex sets of QO's (quantum operations) and POVM's (positive operator valued measures) which are covariant under a general finite-dimensional unitary representation of a group. We derive necessary and sufficient conditions for extremality, and give general bounds for ranks of the extremal POVM's and QO's. Results are illustrated on the basis of simple examples.

Giacomo Mauro D'Ariano

2003-10-03T23:59:59.000Z

20

Modern applications of covariant density functional theory  

E-Print Network [OSTI]

Modern applications of Covariant Density Functional Theory (CDFT) are discussed. First we show a systematic investigation of fission barriers in actinide nuclei within constraint relativistic mean field theory allowing for triaxial deformations. In the second part we discuss a microscopic theory of quantum phase transitions (QPT) based on the relativistic generator coordinate method.

P. Ring; H. Abusara; A. V. Afanasjev; G. A. Lalazissis; T. Niksic; D. Vretenar

2011-09-19T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

The Covariant Description of Electromagnetically Polarizable Media  

E-Print Network [OSTI]

The form of the phenomenological stress-energy-momentum tensor for the electromagnetic field in a class of inhomogeneous, anisotropic magneto-electric media is calculated from first principles, leading to a coherent understanding of the phenomenological stresses and energy-momentum exchanges induced by electromagnetic interactions with such matter in terms of a fully relativistic covariant variational framework.

T. Dereli; J. Gratus; R. W. Tucker

2006-10-26T23:59:59.000Z

22

Covariant Wave Function Reduction and Coherent Decays of Kaon Pair  

E-Print Network [OSTI]

The recently developed relativistically covariant formulation of wave function reduction is illustrated for Lipkin's proposal to study CP violation in the coherent decay of kaon pairs. Covariant results are obtained in agreement with an amplitude approach proposed in the literature.

Bernd A. Berg

1998-09-12T23:59:59.000Z

23

Symmetry and Covariance of Non-relativistic Quantum Mechanics  

E-Print Network [OSTI]

On the basis of a 5-dimensional form of space-time transformations non-relativistic quantum mechanics is reformulated in a manifestly covariant manner. The resulting covariance resembles that of the conventional relativistic quantum mechanics.

Minoru Omote; Susumu Kamefuchi

2000-05-10T23:59:59.000Z

24

Quantum Electrodynamics. I. A Covariant Formulation  

Science Journals Connector (OSTI)

Attempts to avoid the divergence difficulties of quantum electrodynamics by multilation of the theory have been uniformly unsuccessful. The lack of convergence does indicate that a revision of electrodynamic concepts at ultrarelativistic energies is indeed necessary, but no appreciable alteration of the theory for moderate relativistic energies can be tolerated. The elementary phenomena in which divergences occur, in consequence of virtual transitions involving particles with unlimited energy, are the polarization of the vacuum and the self-energy of the electron, effects which essentially express the interaction of the electromagnetic and matter fields with their own vacuum fluctuations. The basic result of these fluctuation interactions is to alter the constants characterizing the properties of the individual fields, and their mutual coupling, albeit by infinite factors. The question is naturally posed whether all divergences can be isolated in such unobservable renormalization factors; more specifically, we inquire whether quantum electrodynamics can account unambiguously for the recently observed deviations from the Dirac electron theory, without the introduction of fundamentally new concepts. This paper, the first in a series devoted to the above question, is occupied with the formulation of a completely covariant electrodynamics. Manifest covariance with respect to Lorentz and gauge transformations is essential in a divergent theory since the use of a particular reference system or gauge in the course of calculation can result in a loss of covariance in view of the ambiguities that may be the concomitant of infinities. It is remarked, in the first section, that the customary canonical commutation relations, which fail to exhibit the desired covariance since they refer to field variables at equal times and different points of space, can be put in covariant form by replacing the four-dimensional surface t=const. by a space-like surface. The latter is such that light signals cannot be propagated between any two points on the surface. In this manner, a formulation of quantum electrodynamics is constructed in the Heisenberg representation, which is obviously covariant in all its aspects. It is not entirely suitable, however, as a practical means of treating electrodynamic questions, since commutators of field quantities at points separated by a time-like interval can be constructed only by solving the equations of motion. This situation is to be contrasted with that of the Schrödinger representation, in which all operators refer to the same time, thus providing a distinct separation between kinematical and dynamical aspects. A formulation that retains the evident covariance of the Heisenberg representation, and yet offers something akin to the advantage of the Schrödinger representation can be based on the distinction between the properties of non-interacting fields, and the effects of coupling between fields. In the second section, we construct a canonical transformation that changes the field equations in the Heisenberg representation into those of non-interacting fields, and therefore describes the coupling between fields in terms of a varying state vector. It is then a simple matter to evaluate commutators of field quantities at arbitrary space-time points. One thus obtains an obviously convariant and practical form of quantum electrodynamics, expressed in a mixed Heisenberg-Schrödinger representation, which is called the interaction representation. The third section is devoted to a discussion of the covariant elimination of the longitudinal field, in which the customary distinction between longitudinal and transverse fields is replaced by a suitable covariant definition. The fourth section is concerned with the description of collision processes in terms of an invariant collision operator, which is the unitary operator that determines the over-all change in state of a system as the result of interaction. It is shown that the collision operator is simply related to the Hermitian reaction operator, for which a var

Julian Schwinger

1948-11-15T23:59:59.000Z

25

Covariances of Prompt Fission Neutron Spectra  

Science Journals Connector (OSTI)

Following the outcomes and the recommendations of the Working Party on Evaluation Cooperation (WPEC) SG-26 the impact of the uncertainties and energy correlations in the prompt neutron fission spectra (PFNS) was studied in several critical benchmarks, both thermal and fast. Two different approaches to calculate the sensitivity of keff with respect to the fission neutron spectra, including the new so-called normalized sensitivity method, were used as a means to check and assure the mathematical correctness of the derived fission spectrum covariance matrices. A new Monte Carlo (MC) method has been proposed and applied to produce the covariance matrices of the PFNS for the neutron induced fission on 235U, 238U and 239Pu nuclei. The MC method was validated by comparison with the matrix derived analytically using the so-called File-30 formalism in ENDF terminology. Several sets of covariance matrices of the PFNS of 235U, 238U and 239Pu nuclei were derived from the uncertainties assigned to the model parameters of the Watt and the recently proposed Kornilov PFNS parameterizations.

I. Kodeli; R. Capote; A. Trkov

2008-01-01T23:59:59.000Z

26

Sequential Covariance Calculation for Exoplanet Image Processing  

E-Print Network [OSTI]

Direct imaging of exoplanets involves the extraction of very faint signals from highly noisy data sets, with noise that often exhibits significant spatial, spectral and temporal correlations. As a results, a large number of post-processing algorithms have been developed in order to optimally decorrelate the signal from the noise. In this paper, we explore four such closely related algorithms, all of which depend heavily on the calculation of covariances between large data sets of imaging data. We discuss the similarities and differences between these methods, and demonstrate how the use sequential calculation techniques can significantly improve their computational efficiencies.

Savransky, Dmitry

2015-01-01T23:59:59.000Z

27

Generalized score tests for missing covariate data  

E-Print Network [OSTI]

. Tosteson and Tsiatis (1988) studied three score tests and their relative efficiency in a generalized linear model with surrogate covariates. We may follow Tosteson and Tsiatis (1988) to study efficiency issue of generalized score tests in the missing data...?. As in Tosteson & Tsiatis (1988), the asymptotic relative efficiency of TGS to T?GS = TGS(pi,??) is ARE(TGS,T?GS) = G/G? whereGandG? are the non-centrality parameters forTGS andT?GS under the sequence of alternatives ?(n)2 . Lemma 3.2.2. When the selection...

Jin, Lei

2009-05-15T23:59:59.000Z

28

AFCI-2.0 Library of Neutron Cross Section Covariances  

SciTech Connect (OSTI)

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.

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

29

EMPIRE ULTIMATE EXPANSION: RESONANCES AND COVARIANCES.  

SciTech Connect (OSTI)

The EMPIRE code system is being extended to cover the resolved and unresolved resonance region employing proven methodology used for the production of new evaluations in the recent Atlas of Neutron Resonances. Another directions of Empire expansion are uncertainties and correlations among them. These include covariances for cross sections as well as for model parameters. In this presentation we concentrate on the KALMAN method that has been applied in EMPIRE to the fast neutron range as well as to the resonance region. We also summarize role of the EMPIRE code in the ENDF/B-VII.0 development. Finally, large scale calculations and their impact on nuclear model parameters are discussed along with the exciting perspectives offered by the parallel supercomputing.

HERMAN,M.; MUGHABGHAB, S.F.; OBLOZINSKY, P.; ROCHMAN, D.; PIGNI, M.T.; KAWANO, T.; CAPOTE, R.; ZERKIN, V.; TRKOV, A.; SIN, M.; CARSON, B.V.; WIENKE, H. CHO, Y.-S.

2007-04-22T23:59:59.000Z

30

Universal and phase-covariant superbroadcasting for mixed qubit states  

SciTech Connect (OSTI)

We describe a general framework to study covariant symmetric broadcasting maps for mixed qubit states. We explicitly derive the optimal N{yields}M superbroadcasting maps, achieving optimal purification of the single-site output copy, in both the universal and phase-covariant cases. We also study the bipartite entanglement properties of the superbroadcast states.

Buscemi, Francesco; D'Ariano, Giacomo Mauro; Macchiavello, Chiara; Perinotti, Paolo [QUIT Group, Dipartimento di Fisica 'A. Volta', Universita di Pavia, via Bassi 6, I-27100 Pavia (Italy)

2006-10-15T23:59:59.000Z

31

The importance of covariance in nuclear data uncertainty propagation studies  

SciTech Connect (OSTI)

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)

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

2012-07-01T23:59:59.000Z

32

Covariance analysis for Energy Density Functionals and instabilities  

E-Print Network [OSTI]

We present the covariance analysis of two successful nuclear energy density functionals, (i) a non-relativistic Skyrme functional built from a zero-range effective interaction, and (ii) a relativistic nuclear energy density functional based on density dependent meson-nucleon couplings. Such a study is crucial for assessing the information content of an observable when predicted by a given model. The covariance analysis is a useful tool for understanding the limitations of a model, the correlations between observables and the statistical errors. We also provide a brief review, partly connected with the covariance analysis, of some instabilities displayed by several energy density functionals of current use in nuclear physics.

Roca-Maza, X; Colò, G

2014-01-01T23:59:59.000Z

33

Economical realization of phase covariant devices in arbitrary dimensions  

E-Print Network [OSTI]

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

Francesco Buscemi; Giacomo Mauro D'Ariano; Chiara Macchiavello

2006-06-14T23:59:59.000Z

34

Covariant density functional theory for antimagnetic rotation  

E-Print Network [OSTI]

Following the previous letter on the first microscopic description of the antimagnetic rotation (AMR) in 105Cd, a systematic investigation and detailed analysis for the AMR band in the frame-work of tilted axis cranking (TAC) model based on covariant density functional theory are carried out. After performing the microscopic and self-consistentTAC calculations with an given density functional, the configuration for the observed AMR band in 105Cd is obtained from the single-particle Routhians. With the configuration thus obtained, the tilt angle for a given rotational frequency is determined self-consistently by minimizing the total Routhian with respect to the tilt angle. In such a way, the energy spectrum, total angular momenta, kinetic and dynamic moments of inertia, and the B(E2) values for the AMR band in 105Cd are calculated. Good agreement with the data is found. By investigating microscopically the contributions from neutrons and protons to the total angular momentum, the "two-shears-like" mechanism in the AMR band is clearly illus-trated. Finally, the currents leading to time-odd mean fields in the Dirac equation are presented and discussed in detail. It is found that they are essentially determined by the valence particles and/or holes. Their spatial distribution and size depend onthe specific single-particle orbitals and the rotational frequency.

P. W. Zhao; J. Peng; H. Z. Liang; P. Ring; J. Meng

2012-05-04T23:59:59.000Z

35

Generalized Covariant Gyrokinetic Dynamics of Magnetoplasmas  

SciTech Connect (OSTI)

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.

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

36

Exponential smoothing with covariates applied to electricity demand forecast  

Science Journals Connector (OSTI)

Exponential smoothing methods are widely used as forecasting techniques in industry and business. Their usual formulation, however, does not allow covariates to be used for introducing extra information into the forecasting process. In this paper, we analyse an extension of the exponential smoothing formulation that allows the use of covariates and the joint estimation of all the unknowns in the model, which improves the forecasting results. The whole procedure is detailed with a real example on forecasting the daily demand for electricity in Spain. The time series of daily electricity demand contains two seasonal patterns: here the within-week seasonal cycle is modelled as usual in exponential smoothing, while the within-year cycle is modelled using covariates, specifically two harmonic explanatory variables. Calendar effects, such as national and local holidays and vacation periods, are also introduced using covariates. [Received 28 September 2010; Revised 6 March 2011, 2 October 2011; Accepted 16 October 2011

José D. Bermúdez

2013-01-01T23:59:59.000Z

37

AFCI-2.0 Neutron Cross Section Covariance Library  

SciTech Connect (OSTI)

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.

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

38

Covariant nonlocal chiral quark models with separable interactions  

SciTech Connect (OSTI)

We present a comparative analysis of chiral quark models which include nonlocal covariant four-fermion couplings. We consider two alternative ways of introducing the nonlocality, as well as various shapes for the momentum-dependent form factors governing the effective interactions. In all cases we study the behavior of model parameters and analyze numerical results for constituent quark masses and quark propagator poles. Advantages of these covariant nonlocal schemes over instantaneous nonlocal schemes and the standard NJL model are pointed out.

Dumm, D. Gomez [IFLP - Dpto. de Fisica, Universidad Nacional de La Plata, C.C. 67, 1900 La Plata (Argentina); CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); Grunfeld, A. G. [Physics Department, Comision Nacional de Energia Atomica, Av. Libertador 8250, 1429 Buenos Aires (Argentina); Scoccola, N. N. [CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); Physics Department, Comision Nacional de Energia Atomica, Av. Libertador 8250, 1429 Buenos Aires (Argentina); Universidad Favaloro, Solis 453, 1078 Buenos Aires (Argentina)

2006-09-01T23:59:59.000Z

39

Covariant Noether Charge for Higher Dimensional Chern-Simons Terms  

E-Print Network [OSTI]

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.

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

2014-07-23T23:59:59.000Z

40

Covariant Noether Charge for Higher Dimensional Chern-Simons Terms  

E-Print Network [OSTI]

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.

Azeyanagi, Tatsuo; Ng, Gim Seng; Rodriguez, Maria J

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

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

42

Geodesic deviation at higher orders via covariant bitensors  

E-Print Network [OSTI]

We review a simple but instructive application of the formalism of covariant bitensors, to use a deviation vector field along a fiducial geodesic to describe a neighboring worldline, in an exact and manifestly covariant manner, via the exponential map. Requiring the neighboring worldline to be a geodesic leads to the usual linear geodesic deviation equation for the deviation vector, plus corrections at higher order in the deviation and relative velocity. We show how these corrections can be efficiently computed to arbitrary orders via covariant bitensor expansions, deriving a form of the geodesic deviation equation valid to all orders, and producing its explicit expanded form through fourth order. We also discuss the generalized Jacobi equation, action principles for the higher-order geodesic deviation equations, results useful for describing accelerated neighboring worldlines, and the formal general solution to the geodesic deviation equation through second order.

Justin Vines

2014-07-25T23:59:59.000Z

43

Addressing spectroscopic quality of covariant density functional theory  

E-Print Network [OSTI]

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.

A. V. Afanasjev

2014-09-17T23:59:59.000Z

44

Addressing spectroscopic quality of covariant density functional theory  

E-Print Network [OSTI]

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.

Afanasjev, A V

2014-01-01T23:59:59.000Z

45

Mean and covariance matrix adaptive estimation for a weakly ...  

E-Print Network [OSTI]

portfolio selection model (of the form ˜P(?)) using simulated and real data in Section 5. ... ical mean and covariance matrix of a process ?t derived from the process rt: ˆ?N+1 ...... The flow balance equations for the xi are then given by: ? .... k, N + 1[, where k ? N. Finally, the optimization problems are solved using Matlab and.

2011-01-25T23:59:59.000Z

46

Covariance Tapering for Interpolation of Large Spatial Datasets  

E-Print Network [OSTI]

Covariance Tapering for Interpolation of Large Spatial Datasets Reinhard FURRER, Marc G. GENTON results. An application to a large climatological precipitation dataset is presented as a concrete-based methods make it possible to analyze and fit large spatial datasets in a high level Reinhard Furrer

Genton, Marc G.

47

Covariance Tapering for Likelihood Based Estimation in Large Spatial Datasets  

E-Print Network [OSTI]

Covariance Tapering for Likelihood Based Estimation in Large Spatial Datasets Cari Kaufman, Mark the likelihood can be computationally infeasible for large datasets, requiring O(n3) calculations for a dataset and Marshall, 1984). However, evaluating the likelihood requires order n3 operations for a dataset of size n

48

A representation theorem for stochastic processes with separable covariance functions,  

E-Print Network [OSTI]

), will often require five or ten dimensions--sometimes more. Covariance functions, being non-negative definite in section 2. Section 2 also presents the restrictions on the conditional and marginal correlation functions itself. Section 3 provides a complete answer to this question, giving a representation theorem

49

A Probabilistic Approach to Adaptive Covariance Localization for Serial Ensemble Square Root Filters  

Science Journals Connector (OSTI)

This study proposes a variational approach to adaptively determine the optimum radius of influence for ensemble covariance localization when uncorrelated observations are assimilated sequentially. The covariance localization is commonly used by ...

Yicun Zhen; Fuqing Zhang

2014-12-01T23:59:59.000Z

50

NOAA Technical Memorandum ERL GLERL-85 COVARIANCE PROPERTIES OF ANNUAL NET BASIN SUPPLIES  

E-Print Network [OSTI]

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

51

Recent progress in the study of fission barriers in covariant density functional theory  

E-Print Network [OSTI]

Recent progress in the study of fission barriers of actinides and superheavy nuclei within covariant density functional theory is overviewed.

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

2012-05-10T23:59:59.000Z

52

Improving efficiency of inferences in randomized clinical trials using auxiliary covariates  

E-Print Network [OSTI]

the performance of the methods. Key words: Covariate adjustment; Hypothesis test; k-arm trial; Kruskal-Wallis test

Davidian, Marie

53

Rank-r latent models for cross-covariance Jacob A. Wegelin  

E-Print Network [OSTI]

Rank-r latent models for cross-covariance Jacob A. Wegelin Thomas S. Richardson University of Gaussian rank-r latent models for cross-covariance. We show by construction that any variance-covariance matrix for the ob- served variables induced by rank-r reduced-rank regression can be induced by a rank

Washington at Seattle, University of

54

Covariant phase space, constraints, gauge and the Peierls formula  

E-Print Network [OSTI]

It is well known that both the symplectic structure and the Poisson brackets of classical field theory can be constructed directly from the Lagrangian in a covariant way, without passing through the non-covariant canonical Hamiltonian formalism. This is true even in the presence of constraints and gauge symmetries. These constructions go under the names of the covariant phase space formalism and the Peierls bracket. We review both of them, paying more careful attention, than usual, to the precise mathematical hypotheses that they require, illustrating them in examples. Also an extensive historical overview of the development of these constructions is provided. The novel aspect of our presentation is a significant expansion and generalization of an elegant and quite recent argument by Forger & Romero showing the equivalence between the resulting symplectic and Poisson structures without passing through the canonical Hamiltonian formalism as an intermediary. We generalize it to cover theories with constraints and gauge symmetries and formulate precise sufficient conditions under which the argument holds. These conditions include a local condition on the equations of motion that we call hyperbolizability, and some global conditions of cohomological nature. The details of our presentation may shed some light on subtle questions related to the Poisson structure of gauge theories and their quantization.

Igor Khavkine

2014-02-07T23:59:59.000Z

55

Deformed one-quasiparticle states in covariant density functional theory  

E-Print Network [OSTI]

Systematic investigation of the accuracy of the description of the energies of deformed one-quasiparticle states has been performed in covariant density functional theory in actinide and rare-earth mass regions. The sources of the discrepancies between theory and experiment are analyzed. Although some improvements in the description of ground state configurations and one-quasiparticle spectra can be achieved by better parametrization of the relativistic mean field Lagrangian, the analysis suggests that spectroscopic quality of their description can be achieved only in theoretical framework which takes into account particle-vibration coupling.

A. V. Afanasjev; S. Shawaqfeh

2012-05-10T23:59:59.000Z

56

Role of Experiment Covariance in Cross Section Adjustments  

SciTech Connect (OSTI)

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

Giuseppe Palmiotti; M. Salvatores

2014-06-01T23:59:59.000Z

57

Implementation of optimal phase-covariant cloning machines  

E-Print Network [OSTI]

The optimal phase covariant cloning machine (PQCM) broadcasts the information associated to an input qubit into a multi-qubit systems, exploiting a partial a-priori knowledge of the input state. This additional a priori information leads to a higher fidelity than for the universal cloning. The present article first analyzes different experimental schemes to implement the 1->3 PQCM. The method is then generalized to any 1->M machine for odd value of M by a theoretical approach based on the general angular momentum formalism. Finally different experimental schemes based either on linear or non-linear methods and valid for single photon polarization encoded qubits are discussed.

Fabio Sciarrino; Francesco De Martini

2006-09-14T23:59:59.000Z

58

Heat kernel expansion in the covariant perturbation theory  

E-Print Network [OSTI]

Working within the framework of the covariant perturbation theory, we obtain the coincidence limit of the heat kernel of an elliptic second order differential operator that is applicable to a large class of quantum field theories. The basis of tensor invariants of the curvatures of a gravity and gauge field background, to the second order, is derived, and the form factors acting on them are obtained in two integral representations. The results are verified by the functional trace operation, by the short proper time (Schwinger-DeWitt) expansions, as well as by the computation of the Green function for the two-dimensional scalar field model.

Yuri V. Gusev

2008-11-06T23:59:59.000Z

59

Is the speed of light invariant or covariant?  

E-Print Network [OSTI]

According to the theory of ether light propagates with constant speed c with respect to the absolute reference frame and with respect to any other reference frame the speed of light is covariant. According to the theory of special relativity the speed of light is invariant with respect to any reference frame. The new theory of reference frames gives a different answer to this question with the consideration of two speeds of light: the physical speed and the relativistic speed. After considering a few negative aspects of the two main theories a few fundamentals of the new theory are expounded.

Daniele Sasso

2010-03-11T23:59:59.000Z

60

Rank Transforms and Tests of Interaction for Repeated Measures Experiments with Various Covariance Structures.  

E-Print Network [OSTI]

??The covariance structure of a repeated measures design can be simple or very complicated. In analyzing repeated measures, rank transformations can be an alternative to… (more)

Bryan, Jennifer Joanne

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

E-Print Network 3.0 - achieving covariance matrix Sample Search...  

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

Engineering 7 WEAK SIGNAL DETECTION IN HYPERSPECTRAL IMAGERY USING SPARSE MATRIX TRANSFORM (SMT) COVARIANCE ESTIMATION Summary: WEAK SIGNAL DETECTION IN HYPERSPECTRAL IMAGERY...

62

E-Print Network 3.0 - aged prevalence covariates Sample Search...  

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

and Ecology ; Biology and Medicine 3 We have modelled malaria prevalence using satellite data as a covariate, and allowing for spatial correlation. Summary: We have modelled...

63

Galilei covariance and Einstein's equivalence principle in quantum reference frames  

E-Print Network [OSTI]

The covariance of the Schr\\"odinger equation under Galilei boosts and the compatibility of nonrelativistic quantum mechanics with Einstein's equivalence principle have been constrained for so long to the existence of a superselection rule which would prevent a quantum particle to be found in superposition states of different masses. In a effort to avoid this expedient, thus allowing for nonrelativistic quantum mechanics to account for unstable particles, recent works have suggested that usual Galilean transformations are inconsistent with the nonrelativistic limit of the Lorentz transformation. Here we approach the issue in a fundamentally different way. Using a formalism of unitary transformations and employing quantum reference frames rather than immaterial coordinate systems, we show that the Schr\\"odinger equation, although form-variant, is fully compatible with the aforementioned principles of relativity.

S. T. Pereira; R. M. Angelo

2014-04-10T23:59:59.000Z

64

Particle vibrational coupling in covariant density functional theory  

E-Print Network [OSTI]

A consistent combination of covariant density functional theory (CDFT) and Landau-Migdal Theory of Finite Fermi Systems (TFFS) is presented. Both methods are in principle exact, but Landau-Migdal theory cannot describe ground state properties and density functional theory does not take into account the energy dependence of the self-energy and therefore fails to yield proper single-% particle spectra as well as the coupling to complex configurations in the width of giant resonances. Starting from an energy functional, phonons and their vertices are calculated without any further parameters. They form the basis of particle-vibrational coupling leading to an energy dependence of the self-energy and an induced energy-dependent interaction in the response equation. A subtraction procedure avoids double counting. Applications in doubly magic nuclei and in a chain of superfluid nuclei show excellent agreement with experimental data.

P. Ring; E. Litvinova

2010-06-21T23:59:59.000Z

65

Hybrid stars within a covariant, nonlocal chiral quark model  

SciTech Connect (OSTI)

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

Blaschke, D. B. [Institute for Theoretical Physics, University of Wroclaw, Max Born place 9, PL-50204 Wroclaw (Poland); Bogoliubov Laboratory of Theoretical Physics, JINR Dubna, Joliot-Curie Street 6, RU-141980 Dubna (Russian Federation); Institut fuer Physik, Universitaet Rostock, Universitaetsplatz 3, D-18051 Rostock (Germany); Dumm, D. Gomez [Instituto de Fisica La Plata, CONICET-Departamento de Fisica, Universidad Nacional de La Plata, C.C. 67, 1900 La Plata (Argentina); CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); Grunfeld, A. G. [CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); Physics Department, Comision Nacional de Energia Atomica, Av. Libertador 8250, 1429 Buenos Aires (Argentina); Klaehn, T. [Institut fuer Physik, Universitaet Rostock, Universitaetsplatz 3, D-18051 Rostock (Germany); Gesellschaft fuer Schwerionenforschung mbH (GSI), D-64291 Darmstadt (Germany); Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843 (United States); Scoccola, N. N. [CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); Physics Department, Comision Nacional de Energia Atomica, Av. Libertador 8250, 1429 Buenos Aires (Argentina); Universidad Favaloro, Solis 453, 1078 Buenos Aires (Argentina)

2007-06-15T23:59:59.000Z

66

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

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

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.

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

2014-11-01T23:59:59.000Z

67

Covariant Kinetic Theory with an Application to the Coma Cluster  

E-Print Network [OSTI]

In this paper, we introduce a novel solution to the covariant Landau equation for a pure electron plasma. The method conserves energy and particle number, and reduces smoothly to the Rosenbluth potentials of non-relativistic theory. In addition, we find that a fully relativistic plasma equilibrates in only 1/100th of a Spitzer time--much faster than in the non-relativistic limit--a factor of significant import to situations in which distortions to a Maxwellian distribution are produced by anomalous methods of acceleration. To demonstrate the power of our solution in dealing with hot, astrophysical plasmas, we use this technique to show that one of the currently considered models--continuous stochastic acceleration--for the hard X-ray emission in the Coma cluster actually cannot work because the energy gained by the particles is distributed to the {\\it whole} plasma on a time scale much shorter than that of the acceleration process itself.

Brandon Wolfe; Fulvio Melia

2005-05-02T23:59:59.000Z

68

Covariance of phenotypically plastic traits induces an adaptive shift in host selection behaviour  

E-Print Network [OSTI]

Covariance of phenotypically plastic traits induces an adaptive shift in host selection behaviour efficiency. In the present study, we investigated covariance of two plastic traits--size at pupation and host; evolution 1. INTRODUCTION Phenotypic plasticity is defined as the ability of an organism to change its

Dukas, Reuven

69

Stable estimation of a covariance matrix guided by nuclear norm penalties  

Science Journals Connector (OSTI)

Estimation of a covariance matrix or its inverse plays a central role in many statistical methods. For these methods to work reliably, estimated matrices must not only be invertible but also well-conditioned. The current paper introduces a novel prior ... Keywords: Condition number, Covariance estimation, Discriminant analysis, EM clustering, Regularization

Eric C. Chi, Kenneth Lange

2014-12-01T23:59:59.000Z

70

Exploring and quantifying the `co-variability' of the extremes corresponding to different climate components  

E-Print Network [OSTI]

Exploring and quantifying the `co-variability' of the extremes corresponding to different climate to the fact that there might be moisture-temperature feedback that has further implications on the extremes. Having said, we aim to study how extreme precipitation and temperature co-vary and are determined

Miami, University of

71

Covariant Spectator Theory of np scattering: Isoscalar interaction currents  

SciTech Connect (OSTI)

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.

Gross, Franz L. [JLAB

2014-06-01T23:59:59.000Z

72

Particle-vibration coupling within covariant density functional theory  

E-Print Network [OSTI]

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.

E. Litvinova; P. Ring; V. Tselyaev

2007-05-08T23:59:59.000Z

73

Highly covariant quantum lattice gas model of the Dirac equation  

E-Print Network [OSTI]

We revisit the quantum lattice gas model of a spinor quantum field theory-the smallest scale particle dynamics is partitioned into unitary collide and stream operations. The construction is covariant (on all scales down to a small length {\\ell} and small time {\\tau} = c {\\ell}) with respect to Lorentz transformations. The mass m and momentum p of the modeled Dirac particle depend on {\\ell} according to newfound relations m = mo cos (2{\\pi}{\\ell}/{\\lambda}) and p = (h/2{\\pi}{\\ell}) sin(2{\\pi}{\\ell}/{\\lambda}), respectively, where {\\lambda} is the Compton wavelength of the modeled particle. These relations represent departures from a relativistically invariant mass and the de Broglie relation-when taken as quantifying numerical errors the model is physically accurate when {\\ell} {\\ll} {\\lambda}. Calculating the vacuum energy in the special case of a massless spinor field, we find that it vanishes (or can have a small positive value) for a sufficiently large wave number cutoff. This is a marked departure from the usual behavior of such a massless field.

Jeffrey Yepez

2011-06-03T23:59:59.000Z

74

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

Open Energy Info (EERE)

Six-Week Time Series Of Eddy Covariance Co2 Flux At Mammoth Mountain, Six-Week Time Series Of Eddy Covariance Co2 Flux At Mammoth Mountain, California- Performance Evaluation And Role Of Meteorological Forcing Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Six-Week Time Series Of Eddy Covariance Co2 Flux At Mammoth Mountain, California- Performance Evaluation And Role Of Meteorological Forcing Details Activities (1) Areas (1) Regions (0) Abstract: CO2 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 CO2 emission rates. EC CO2 fluxes ranged from 218 to 3500 g m- 2 d- 1 (mean = 1346 g m- 2 d- 1). Using footprint modeling, EC CO2 fluxes were compared to CO2 fluxes measured by

75

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

E-Print Network [OSTI]

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...

Li, Bo

2009-06-02T23:59:59.000Z

76

Roc-based estimates of neural-behavioral covariations using matched filters  

Science Journals Connector (OSTI)

Correlations between responses in visual cortex and perceptual performance help draw a functional link between neural activity and visually guided behavior. These correlations are commonly derived with ROC-based neural-behavioral covariances referred ...

Kamal Farah; Jackson E. T. Smith; Erik P. Cook

2014-08-01T23:59:59.000Z

77

Eddy covariance flux measurements of pollutant gases in urban Mexico City  

E-Print Network [OSTI]

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 ...

Velasco, Erik

78

An Adaptive Approach to Mitigate Background Covariance Limitations in the Ensemble Kalman Filter  

Science Journals Connector (OSTI)

A new approach is proposed to address the background covariance limitations arising from undersampled ensembles and unaccounted model errors in the ensemble Kalman filter (EnKF). The method enhances the representativeness of the EnKF ensemble by ...

Hajoon Song; Ibrahim Hoteit; Bruce D. Cornuelle; Aneesh C. Subramanian

2010-07-01T23:59:59.000Z

79

Initial Member Selection and Covariance Localization Study of Ensemble Kalman Filter based Data Assimilation  

E-Print Network [OSTI]

localization schemes: Distance-based, Streamline trajectory-based, and Streamline sensitivity-based localization and Hierarchical EnKF on a synthetic reservoir field case study. We will describe the methodology of each of the covariance localization schemes...

Yip, Yeung

2011-08-08T23:59:59.000Z

80

Discrete Alterations of Brain Network Structural Covariance in Individuals at Ultra-High Risk for Psychosis  

Science Journals Connector (OSTI)

AbstractBackground Investigation of aberrant large-scale brain networks offers novel insight into the role these networks play in diverse psychiatric disorders, such as schizophrenia. While there are studies reporting altered functional brain connectivity in participants at ultra-high risk (UHR) for psychosis, it is unclear whether these alterations extend to structural brain networks. Methods Whole-brain structural covariance patterns of 133 participants at UHR for psychosis (51 of whom subsequently developed psychosis) and 65 healthy controls (HC) were studied. Following data pre-processing (using VBM8), the mean signal in seed regions relating to specific networks (visual, auditory, motor, speech, semantic, executive, salience and default-mode) were extracted and voxel-wise analyses of covariance were conducted to compare the association between whole brain signal and each seed region for UHR and HC individuals. UHR participants who transitioned were compared to those who did not. Results Significantly reduced structural covariance was observed in the UHR sample compared to HC for the default-mode network, and increased covariance for the motor and executive control networks. When those who transitioned to psychosis were compared with those who did not, aberrant structural covariance was observed in the salience, executive-control, auditory and motor networks. Conclusions Whole-brain structural covariance analyses revealed subtle changes of connectivity of the default-mode, executive control, salience, motor and auditory networks in UHR individuals for psychosis. Although we found significant differences, these are small changes, and tend to reflect largely intact structural networks.

Kareen Heinze; Renate L.E.P. Reniers; Barnaby Nelson; Alison R. Yung; Ashleigh Lin; Ben J. Harrison; Christos Pantelis; Dennis Velakoulis; Patrick D. McGorry; Stephen J. Wood

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Generation of an Covariance Matrix by Monte Carlo Sampling of the Phonon Frequency Spectrum  

Science Journals Connector (OSTI)

Abstract Formats and procedures are currently established for representing covariances in the ENDF library for many reaction types. However, no standard exists for thermal neutron inelastic scattering cross section covariance data. These cross sections depend on the material's dynamic structure factor, or S ( ? , ? ) . The structure factor is a function of the phonon density of states (DOS). Published ENDF thermal neutron scattering libraries are commonly produced by modeling codes, such as NJOY/LEAPR, which utilize the DOS as the fundamental input and directly output the S ( ? , ? ) matrix. To calculate covariances for the computed S ( ? , ? ) data, information about uncertainties in the DOS is required. The DOS may be viewed as a probability distribution function of available atomic vibrational energy states in a solid. In this work, density functional theory and lattice dynamics in the harmonic approximation were used to simulate the structure of silicon dioxide (?-quartz) to produce the DOS. A range for the variation in the partial DOS for silicon in ?-quartz was established based on limits of variation in the crystal lattice parameters. Uncertainty in an experimentally derived DOS may also be incorporated with the same methodology. A description of possible variation in the DOS allowed Monte Carlo generation of a set of perturbed DOS spectra which were sampled to produce the S ( ? , ? ) covariance matrix for scattering with silicon in ?-quartz. With appropriate sensitivity matrices, it is shown that the S ( ? , ? ) covariance matrix can be propagated to generate covariance matrices for integrated cross sections, secondary energy distributions, and coupled energy-angle distributions.

J.C. Holmes; A.I. Hawari

2014-01-01T23:59:59.000Z

82

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

E-Print Network [OSTI]

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.

Ivezic, Tomislav

2014-01-01T23:59:59.000Z

83

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

E-Print Network [OSTI]

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.

Tomislav Ivezic

2014-07-14T23:59:59.000Z

84

PRELIMINARY CROSS SECTION AND NU-BAR COVARIANCES FOR WPEC SUBGROUP 26  

SciTech Connect (OSTI)

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.

ROCHMAN,D.

2007-01-31T23:59:59.000Z

85

Covariance analysis of finite temperature density functional theory: symmetric nuclear matter  

E-Print Network [OSTI]

We study symmetric nuclear matter at finite temperature, with particular emphasis on the liquid-gas phase transition. We use a standard covariance analysis to propagate statistical uncertainties from the density functional to the thermodynamic properties. We use four functionals with known covariance matrices to obtain as wide a set of results as possible. Our findings suggest that thermodynamical properties are very well constrained by fitting data at zero temperature. The propagated statistical errors in the liquid-gas phase transition parameters are relatively small.

A. Rios; X. Roca-Maza

2014-08-21T23:59:59.000Z

86

Covariant formulations of Baumgarte, Shapiro, Shibata, and Nakamura and the standard gauge  

SciTech Connect (OSTI)

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

Brown, J. David [Department of Physics, North Carolina State University, Raleigh, North Carolina 27695 (United States)

2009-05-15T23:59:59.000Z

87

Using a High-Frequency Fluorescent Oxygen Probe in Atmospheric Eddy Covariance Applications  

Science Journals Connector (OSTI)

During the years 2010–13, atmospheric eddy covariance measurement of oxygen was performed at the marine site Östergarnsholm in the Baltic Sea. The fast response optode Microx TX3 was used with two different types of tapered sensors. In spite of ...

Andreas Andersson; Anna Rutgersson; Erik Sahlée

2014-11-01T23:59:59.000Z

88

Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net  

E-Print Network [OSTI]

, 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

Blei, David M.

89

Exploiting Covariate Similarity in Sparse Regression via the Pairwise Elastic Net  

E-Print Network [OSTI]

. 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

Low, Steven H.

90

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

E-Print Network [OSTI]

LONGITUDINAL DATA ANALYSIS USING MULTILEVEL LINEAR MODELING (MLM): FITTING AN OPTIMAL VARIANCE-COVARIANCE STRUCTURE A Dissertation by YUAN-HSUAN LEE Submitted to the Office of Graduate Studies of Texas A&M University... in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY August 2010 Major Subject: Educational Psychology Longitudinal Data Analysis Using Multilevel Linear Modeling (MLM...

Lee, Yuan-Hsuan

2011-10-21T23:59:59.000Z

91

A full-scale approximation of covariance functions for large spatial data sets  

E-Print Network [OSTI]

A full-scale approximation of covariance functions for large spatial data sets Huiyan Sang in spatial statistics but face tremendous computational challenges for very large data sets. The model fitting and spatial prediction of such models typically require O(n3 ) operations for a data set of size n

Huang, Jianhua

92

To be submitted to ApJ A Formalism for Covariant Polarized Radiative Transport by Ray  

E-Print Network [OSTI]

To be submitted to ApJ A Formalism for Covariant Polarized Radiative Transport by Ray Tracing that the transport equation in vacuo is kµ µN = 0. We show that this is equivalent to Broderick & Blandford (2004)'s a procedure for solving the polarized radiative transfer equation in a curved spacetime. Other possible

Gammie, Charles F.

93

Predictable nonwandering localization of covariant Lyapunov vectors and cluster synchronization in scale-free networks of chaotic maps  

E-Print Network [OSTI]

Covariant Lyapunov vectors for scale-free networks of Henon maps are highly localized. We revealed two mechanisms of the localization related to full and phase cluster synchronization of network nodes. In both cases the localization nodes remain unaltered in course of the dynamics, i.e., the localization is nonwandering. Moreover this is predictable: the localization nodes are found to have specific dynamical and topological properties and they can be found without computing of the covariant vectors. This is an example of explicit relations between the system topology, its phase space dynamics, and the associated tangent space dynamics of covariant Lyapunov vectors.

Pavel V. Kuptsov; Anna V. Kuptsova

2014-06-22T23:59:59.000Z

94

Covariant 2+2 formulation of the initial-value problem in general relativity  

Science Journals Connector (OSTI)

A covariant 2 + 2 formalism is developed in which space-time is decomposed into a family of spacelike two-surfaces and their orthogonal timelike two-surface elements. The resulting 2 + 2 breakup of the Einstein vacuum field equations is then used to investigate covariant formulations of spacelike, characteristic, and mixed initial-value problems. In each case the so-called conformal two-structure (essentially the conformal metric of a family of spacelike two-surfaces) is identified as the freely specifiable initial data. The formalism makes clear the geometrical significance of both the initial data and the various choices of gauge variables. A Lagrangian formulation is included which supports the role of the conformal two-structure as dynamical variables of the pure gravitational field.

R. A. d'Inverno and J. Smallwood

1980-09-15T23:59:59.000Z

95

Variational Assimilation for Xenon Dynamical Forecasts in Neutronic using Advanced Background Error Covariance Matrix  

E-Print Network [OSTI]

Data assimilation method consists in combining all available pieces of information about a system to obtain optimal estimates of initial states. The different sources of information are weighted according to their accuracy by the means of error covariance matrices. Our purpose here is to evaluate the efficiency of variational data assimilation for the xenon induced oscillations forecasts in nuclear cores. In this paper we focus on the comparison between 3DVAR schemes with optimised background error covariance matrix B and a 4DVAR scheme. Tests were made in twin experiments using a simulation code which implements a mono-dimensional coupled model of xenon dynamics, thermal, and thermal-hydraulic processes. We enlighten the very good efficiency of the 4DVAR scheme as well as good results with the 3DVAR one using a careful multivariate modelling of B.

Ponçot, Angélique; Bouriquet, Bertrand; Erhard, Patrick; Gratton, Serge; Thual, Olivier

2013-01-01T23:59:59.000Z

96

Variational assimilation for xenon dynamical forecasts in neutronic using advanced background error covariance matrix modelling  

Science Journals Connector (OSTI)

Abstract Data assimilation method consists in combining all available pieces of information about a system to obtain optimal estimates of initial states. The different sources of information are weighted according to their accuracy by the means of error covariance matrices. Our purpose here is to evaluate the efficiency of variational data assimilation for the xenon induced oscillations forecasts in nuclear cores. In this paper we focus on the comparison between 3DVAR schemes with optimised background error covariance matrix B and a 4DVAR scheme. Tests were made in twin experiments using a simulation code which implements a mono-dimensional coupled model of xenon dynamics, thermal, and thermal–hydraulic processes. We enlighten the very good efficiency of the 4DVAR scheme as well as good results with the 3DVAR one using a careful multivariate modelling of B.

Angélique Ponçot; Jean-Philippe Argaud; Bertrand Bouriquet; Patrick Erhard; Serge Gratton; Olivier Thual

2013-01-01T23:59:59.000Z

97

Backward and covariant Lyapunov vectors and exponents for hard disk systems with a steady heat current  

E-Print Network [OSTI]

The covariant Lyapunov analysis is generalised to systems attached to deterministic thermal reservoirs that create a heat current across the system and perturb it away from equilibrium. The change in the Lyapunov exponents as a function of heat current is described and explained. Both the nonequilibrium backward and covariant hydrodynamic Lyapunov modes are analysed and compared. The movement of the converged angle between the hydrodynamic stable and unstable conjugate manifolds with the free flight time of the dynamics is accurately predicted for any nonequilibrium system simply as a function of their exponent. The nonequilibrium positive and negative $\\LP$ mode frequencies are found to be asymmetrical, causing the negative mode to oscillate between the two functional forms of each mode in the positive conjugate mode pair. This in turn leads to the angular distributions between the conjugate modes to oscillate symmetrically about $\\pi/2$ at a rate given by the difference between the positive and negative mode frequencies.

Daniel P. Truant; Gary P. Morriss

2014-05-28T23:59:59.000Z

98

Equations of motion in scalar-tensor theories of gravity: A covariant multipolar approach  

Science Journals Connector (OSTI)

We discuss the dynamics of extended test bodies for a large class of scalar-tensor theories of gravitation. A covariant multipolar Mathisson—Papapetrou—Dixon type of approach is used to derive the equations of motion in a systematic way for both Jordan and Einstein formulations of these theories. The results obtained provide the framework to experimentally test scalar-tensor theories by means of extended test bodies.

Yuri N. Obukhov and Dirk Puetzfeld

2014-11-25T23:59:59.000Z

99

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

E-Print Network [OSTI]

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.

Robert R. Lompay; Alexander N. Petrov

2013-07-01T23:59:59.000Z

100

Covariant representations of the relativistic Brueckner T-matrix and the nuclear matter problem  

Science Journals Connector (OSTI)

We investigate nuclear matter properties in the relativistic Brueckner approach. The in-medium on-shell T-matrix is represented covariantly by five Lorentz invariant amplitudes from which we deduce directly the nucleon self-energy. We discuss the ambiguities of this approach and the failure of previously used covariant representations in reproducing the nucleon self-energies on the Hartree-Fock level. To enforce correct Hartree-Fock results we develop a subtraction scheme which treats the bare nucleon-nucleon potential exactly in accordance with the different types of meson exchanges. For the remaining ladder kernel, which contains the higher order correlations, we employ two different covariant representations in order to study the uncertainty inherent in the approach. The nuclear matter bulk properties are only slightly sensitive to the explicit representation used for the kernel. However, we obtain new Coester lines for the various Bonn potentials which are shifted towards the empirical region of saturation. In addition the nuclear equation-of-state turns out to be significantly softer in the new approach.

T. Gross-Boelting; C. Fuchs; Amand Faessler

1999-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Covariant representations of the relativistic Brueckner T-matrix and the nuclear matter problem  

E-Print Network [OSTI]

We investigate nuclear matter properties in the relativistic Brueckner approach. The in-medium on-shell T-matrix is represented covariantly by five Lorentz invariant amplitudes from which we deduce directly the nucleon self-energy. We discuss the ambiguities of this approach and the failure of previously used covariant representations in reproducing the nucleon self-energies on the Hartree-Fock level. To enforce correct Hartree-Fock results we develop a subtraction scheme which treats the bare nucleon-nucleon potential exactly in accordance to the different types of meson exchanges. For the remaining ladder kernel, which contains the higher order correlations, we employ then two different covariant representations in order to study the uncertainty inherent in the approach. The nuclear matter bulk properties are only slightly sensitive on the explicit representation used for the kernel. However, we obtain new Coester lines for the various Bonn potentials which are shifted towards the empirical region of saturation. In addition the nuclear equation-of-state turns out to be significantly softer in the new approach.

T. Gross-Boelting; C. Fuchs; Amand Faessler

1998-10-27T23:59:59.000Z

102

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

SciTech Connect (OSTI)

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.

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

2009-05-06T23:59:59.000Z

103

Inefficient eight-port homodyne detection and covariant phase space observables  

E-Print Network [OSTI]

We consider the quantum optical eight-port homodyne detection scheme in the case that each of the associated photon detectors is assigned with a different quantum efficiency. We give a mathematically rigorous and strictly quantum mechanical proof of the fact that the measured observable (positive operator measure) in the high-amplitude limit is a smearing of the covariant phase space observable related to the ideal measurement. The result is proved for an arbitary parameter field. Furthermore, we investigate some properties of the measured observable. In particular, we show that the state distinguishing power of the observable is not affected by detector inefficiencies.

Pekka Lahti; Juha-Pekka Pellonpää; Jussi Schultz

2010-04-28T23:59:59.000Z

104

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

SciTech Connect (OSTI)

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.

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

105

Integer- and Non-Integer-Shift of the Chern-Simons Coupling under a Local Higher Covariant Derivative Regulator  

E-Print Network [OSTI]

The Chern-Simons coupling shift is calculated within the framework of the hybrid regularization based on a local higher covariant derivative regulator. When the Yang-Mills term is present in the theory the well-know integer-shift is obtained, but is absent, the shift value is non-integer. These results show a possibility that a non-integer-shift can be derived using a local higher covariant derivative and also suggest that the Yang-Mills term plays an important role in the integer-shift of the Chern-Simons coupling.

Koh-ichi Nittoh

2002-01-14T23:59:59.000Z

106

Equations of motion in metric-affine gravity: A covariant unified framework  

Science Journals Connector (OSTI)

We derive the equations of motion of extended deformable bodies in metric-affine gravity. The conservation laws which follow from the invariance of the action under the general coordinate transformations are used as a starting point for the discussion of the dynamics of extended deformable test bodies. By means of a covariant approach, based on Synge’s world function, we obtain the master equation of motion for an arbitrary system of coupled conserved currents. This unified framework is then applied to metric-affine gravity. We confirm and extend earlier findings; in particular, we once again demonstrate that it is only possible to detect the post-Riemannian spacetime geometry by ordinary (nonmicrostructured) test bodies if gravity is nonminimally coupled to matter.

Dirk Puetzfeld and Yuri N. Obukhov

2014-10-20T23:59:59.000Z

107

Octupole deformation and Ra puzzle in reflection asymmetric covariant density functional theory  

E-Print Network [OSTI]

Reflection asymmetric covariant density functional theory(CDFT) based on the point-coupling interaction is established on a two-center harmonic-oscillator basis and applied to investigate the Ra puzzle, i.e., the anomalous enhancement of the residual proton-neutron interactions for Ra isotopes around N=135. The octupole deformation and shape evolution in the Ra and Rn isotopes are examined in the potential energy surfaces in(beta2, beta3) plane by the constrained reflection asymmetric calculations. The residual proton-neutron interactions extracted from the double difference of the binding energies for Ra isotopes are compared with the data as well as the axial and the triaxial calculations. It is found that the octupole deformation is responsible for the Ra puzzle in the microscopic CDFT.

L. F. Yu; P. W. Zhao; S. Q. Zhang; J. Meng

2012-11-03T23:59:59.000Z

108

Localized form of Fock terms in nuclear covariant density functional theory  

E-Print Network [OSTI]

In most of the successful versions of covariant density functional theory in nuclei, the Fock terms are not included explicitly, which leads to local functionals and forms the basis of their widespread applicability at present. However, it has serious consequences for the description of Gamow-Teller resonances (GTR) and spin-dipole resonances (SDR) which can only be cured by adding further phenomenological parameters. Relativistic Hartree-Fock models do not suffer from these problems. They can successfully describe the GTR and SDR as well as the isovector part of the Dirac effective mass without any additional parameters. However, they are non-local and require considerable numerical efforts. By the zero-range reduction and the Fierz transformation, a new method is proposed to take into account the Fock terms in local functionals, which retains the simplicity of conventional models and provides proper descriptions of the spin-isospin channels and the Dirac masses.

Haozhao Liang; Pengwei Zhao; Peter Ring; Xavier Roca-Maza; Jie Meng

2012-07-26T23:59:59.000Z

109

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

E-Print Network [OSTI]

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.

Qian Zhao; Bao Yuan Sun; Wen Hui Long

2014-11-23T23:59:59.000Z

110

Magnetic rotations in 198Pb and 199Pb within covariant density functional theory  

E-Print Network [OSTI]

Well-known examples of shears bands in the nuclei 198Pb and 199Pb are investigated within tilted axis cranking relativistic mean-field theory. Energy spectra, the relation between spin and rotational frequency, deformation parameters and reduced $M1$ and $E2$ transition probabilities are calculated. The results are in good agreement with available data and with calculations based on the phenomenological pairing plus-quadrupole-quadrupole tilted-axis cranking model. It is shown that covariant density functional theory provides a successful microscopic and fully self-consistent description of magnetic rotation in the Pb region showing the characteristic properties as the shears mechanism and relatively large B(M1) transitions decreasing with increasing spin.

L. F. Yu; P. W. Zhao; S. Q. Zhang; P. Ring; J. Meng

2012-02-28T23:59:59.000Z

111

Symmetry-breaking mechanism for the Z4 general-covariant evolution system  

Science Journals Connector (OSTI)

The general-covariant Z4 formalism is further analyzed. The gauge conditions are generalized with a view to numerical relativity applications and the conditions for obtaining strongly hyperbolic evolution systems are given both at the first and the second order levels. A symmetry-breaking mechanism is proposed that allows one, when applied in a partial way, to recover previously proposed strongly hyperbolic formalisms, like the BSSN and the Bona-Massó formulas. When applied in its full form, the symmetry-breaking mechanism allows one to recover the full five-parameter family of first order KST systems. Numerical codes based in the proposed formalisms are tested. A robust stability test is provided by evolving random noise data around Minkowski space-time. A strong field test is provided by the collapse of a periodic background of plane gravitational waves, as described by the Gowdy metric.

C. Bona; T. Ledvinka; C. Palenzuela; M. Žá?ek

2004-03-26T23:59:59.000Z

112

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

E-Print Network [OSTI]

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.

Zhao, Qian; Long, Wen Hui

2014-01-01T23:59:59.000Z

113

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

E-Print Network [OSTI]

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.

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

2014-10-23T23:59:59.000Z

114

Generally covariant model of a scalar field with high frequency dispersion and the cosmological horizon problem  

E-Print Network [OSTI]

Short distance structure of spacetime may show up in the form of high freqency dispersion. Although such dispersion is not locally Lorentz invariant, we show in a scalar field model how it can nevertheless be incorporated into a generally covariant metric theory of gravity provided the locally preferred frame is dynamical. We evaluate the resulting energy-momentum tensor and compute its expectation value for a quantum field in a thermal state. The equation of state differs at high temperatures from the usual one, but not by enough to impact the problems of a hot big bang cosmology. We show that a superluminal dispersion relation can solve the horizon problem via superluminal equilibration, however it cannot do so while remaining outside the Planck regime unless the dispersion relation is artificially chosen to have a rather steep dependence on wavevector.

Ted Jacobson; David Mattingly

2000-09-11T23:59:59.000Z

115

Covariant Hysteretic Constitutive Theory for Maxwell's equations: Application to Axially Rotating Media  

E-Print Network [OSTI]

This paper explores a class of non-linear constitutive relations for materials with memory in the framework of covariant macroscopic Maxwell theory. Based on earlier models for the response of hysteretic ferromagnetic materials to prescribed slowly varying magnetic background fields, generalized models are explored that are applicable to accelerating hysteretic magneto-electric substances coupled self-consistently to Maxwell fields. Using a parameterized model consistent with experimental data for a particular material that exhibits purely ferroelectric hysteresis when at rest in a slowly varying electric field, a constitutive model is constructed that permits a numerical analysis of its response to a driven harmonic electromagnetic field in a rectangular cavity. This response is then contrasted with its predicted response when set in uniform rotary motion in the cavity.

Alison C. Hale; Robin W. Tucker

2013-01-08T23:59:59.000Z

116

Covariantly Constant Curvature Tensors and D=3, N=4, 5, 8 Chern-Simons Matter Theories  

E-Print Network [OSTI]

We construct some examples of D=3, N=4 GW theory and N=5 superconformal Chern-Simons matter theory by using the covariantly constant curvature of a quaternionic-Kahler manifold to construct the symplectic 3-algebra in the theories. Comparing with the previous theories, the N=4, 5 theories constructed in this way possess a local Sp(2n) symmetry and a diffeomorphism symmetry associated with the quaternionic-Kahler manifold. We also construct a generalized N=8 BLG theory by utilizing the dual curvature operator of a maximally symmetric space of dimension 4 to construct the Nambu 3-algebra. Comparing with the previous N=8 BLG theory, the theory has a diffeomorphism invariance and a local SO(4) invariance associated with the symmetric space.

Fa-Min Chen

2011-09-18T23:59:59.000Z

117

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

E-Print Network [OSTI]

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.

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

2014-01-01T23:59:59.000Z

118

EFFECT OF MODEL-DEPENDENT COVARIANCE MATRIX FOR STUDYING BARYON ACOUSTIC OSCILLATIONS  

SciTech Connect (OSTI)

Large-scale structures in the universe are a powerful tool to test cosmological models and constrain cosmological parameters. A particular feature of interest comes from baryon acoustic oscillations (BAOs), which are sound waves traveling in the hot plasma of the early universe that stopped at the recombination time. This feature can be observed as a localized bump in the correlation function at the scale of the sound horizon r{sub s} . As such, it provides a standard ruler and a lot of constraining power in the correlation function analysis of galaxy surveys. Moreover, the detection of BAOs at the expected scale gives strong support to cosmological models. Both of these studies (BAO detection and parameter constraints) rely on a statistical modeling of the measured correlation function {xi}-circumflex. Usually {xi}-circumflex is assumed to be Gaussian, with a mean {xi}{sub {theta}} depending on the cosmological model and a covariance matrix C generally approximated as a constant (i.e., independent of the model). In this article, we study whether a realistic model-dependent C {sub {theta}} changes the results of cosmological parameter constraints compared to the approximation of a constant covariance matrix C. For this purpose, we use a new procedure to generate lognormal realizations of the luminous red galaxy sample of the Sloan Digital Sky Survey Data Release 7 to obtain a model-dependent C {sub {theta}} in a reasonable time. The approximation of C {sub {theta}} as a constant creates small changes in the cosmological parameter constraints on our sample. We quantify this modeling error using a lot of simulations and find that it only has a marginal influence on cosmological parameter constraints for current and next-generation galaxy surveys. It can be approximately taken into account by extending the 1{sigma} intervals by a factor Almost-Equal-To 1.3.

Labatie, A.; Starck, J. L. [Laboratoire AIM (UMR 7158), CEA/DSM-CNRS-Universite Paris Diderot, IRFU, SEDI-SAP, Service d'Astrophysique, Centre de Saclay, F-91191 Gif-Sur-Yvette cedex (France); Lachieze-Rey, M., E-mail: antoine.labatie@cea.fr [Astroparticule et Cosmologie (APC), CNRS-UMR 7164, Universite Paris 7 Denis Diderot, 10, rue Alice Domon et Leonie Duquet, F-75205 Paris Cedex 13 (France)

2012-12-01T23:59:59.000Z

119

Sorption-caused attenuation and delay of water-vapor signals in eddy-covariance sampling tubes and filters  

Science Journals Connector (OSTI)

Adsorption and desorption (together sorption) processes in sampling tubes and filters of eddy-covariance stations cause attenuation and delay of water-vapor signals, leading to underestimation of water-vapor fluxes by tens of per cent. The aim of ...

Annika Nordbo; Pekka Kekäläinen; Erkki Siivola; Ivan Mammarella; Jussi Timonen; Timo Vesala

120

A Portable Eddy Covariance System for the Measurement of Ecosystem–Atmosphere Exchange of CO2, Water Vapor, and Energy  

Science Journals Connector (OSTI)

To facilitate the study of flux heterogeneity within a region, the authors have designed and field-tested a portable eddy covariance system to measure exchange of CO2, water vapor, and energy between the land surface and the atmosphere. The ...

D. P. Billesbach; M. L. Fischer; M. S. Torn; J. A. Berry

2004-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Nestling telomere length does not predict longevity, but covaries with adult body size in wild barn swallows  

Science Journals Connector (OSTI)

...All rights reserved. October 23, 2013 research-article Evolutionary...70 60 Nestling telomere length does not predict longevity, but covaries...mean for males: 7.44 (0.23) kb; females: 7.90 (0...obscure. Hence, the present study does not support the idea that TL...

2013-01-01T23:59:59.000Z

122

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

E-Print Network [OSTI]

testing of the ENDF/B-VII.1 library is provided for a variety of quantities: For nuclear criticalityENDF/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

Danon, Yaron

123

Deriving Daytime Variables From the AmeriFlux Standard Eddy Covariance Data Set  

SciTech Connect (OSTI)

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

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

2008-12-06T23:59:59.000Z

124

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

E-Print Network [OSTI]

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

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

2008-04-15T23:59:59.000Z

125

Nonaxial-octupole Y_{32} correlations in N = 150 isotones from multidimensional constrained covariant density functional theories  

E-Print Network [OSTI]

The non-axial reflection-asymmetric $\\beta_{32}$ shape in some transfermium nuclei with N=150, namely $^{246}$Cm, $^{248}$Cf, $^{250}$Fm, and $^{252}$No are investigated with multidimensional constrained covariant density functional theories. By using the density-dependent point coupling covariant density functional theory with the parameter set DD-PC1 in the particle-hole channel, it is found that, for the ground states of $^{248}$Cf and $^{250}$Fm, the non-axial octupole deformation parameter $\\beta_{32} > 0.03$ and the energy gain due to the $\\beta_{32}$ distortion is larger than 300 keV. In $^{246}$Cm and $^{252}$No, shallow $\\beta_{32}$ minima are found. The occurrence of the non-axial octupole $\\beta_{32}$ correlations is mainly from a pair of neutron orbitals $[734]9/2$ ($\

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

2012-09-28T23:59:59.000Z

126

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

SciTech Connect (OSTI)

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.

Giuseppe Palmiotti; Massimo Salvatores

2014-04-01T23:59:59.000Z

127

A demonstration of variance and covariance calculations using MAVARIC (Materials Accounting VARIance Calculator) and PROFF (PROcessing and Fuel Facilities calculator)  

SciTech Connect (OSTI)

Good decision-making in materials accounting requires a valid calculation of control limits and detection sensitivity for facilities handling special nuclear materials (SNM). A difficult aspect of this calculation is determining the appropriate variance and covariance values for the terms in the materials balance (MB) equation. Computer software such as MAVARIC (Materials Accounting VARIance Calculator) and PROFF (PROcessing and Fuel Facilities calculator) can efficiently select and combine variance terms. These programs determine the variance and covariance of an MB equation by first obtaining relations for the variance and covariance of each term in the MB equation through propagating instrument errors and then substituting the measured quantities and their uncertainties into these relations. MAVARIC is a custom spreadsheet used with the second release of LOTUS 1-2-3.** PROFF is a stand-alone menu-driven program requiring no commercial software. Programs such as MAVARIC and PROFF facilitate the complex calculations required to determine the detection sensitivity of an SNM facility. These programs can also be used to analyze materials accounting systems.

Barlich, G.L.; Nasseri, S.S.

1990-01-01T23:59:59.000Z

128

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

E-Print Network [OSTI]

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.

S. J. van Enk

2013-02-12T23:59:59.000Z

129

Intercomparison of Sensible Heat Flux from Large Aperture Scintillometer and Eddy Covariance Methods: Field Experiment over a Homogeneous Semi-arid Region  

E-Print Network [OSTI]

uctuations of vertical wind speed and air temperature at abetween ?uctuations of vertical wind speed and ?uctuationsT is the covariance between vertical wind speed (w) and air

Zeweldi, Dawit A.; Gebremichael, Mekonnen; Wang, Junming; Sammis, Theodore; Kleissl, Jan; Miller, David

2010-01-01T23:59:59.000Z

130

Low-rank approximations for large stationary covariance matrices, as used in the Bayesian and generalized-least-squares analysis of pulsar-timing data  

E-Print Network [OSTI]

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.

van Haasteren, Rutger

2014-01-01T23:59:59.000Z

131

Low-rank approximations for large stationary covariance matrices, as used in the Bayesian and generalized-least-squares analysis of pulsar-timing data  

E-Print Network [OSTI]

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.

Rutger van Haasteren; Michele Vallisneri

2014-07-24T23:59:59.000Z

132

Crucial test for covariant density functional theory with new and accurate mass measurements from Sn to Pa  

E-Print Network [OSTI]

The covariant density functional theory with the point-coupling interaction PC-PK1 is compared with new and accurate experimental masses in the element range from 50 to 91. The experimental data are from a mass measurement performed with the storage ring mass spectrometry at GSI [Chen et al., Nucl. Phys. A 882, 71 (2012)]. Although the microscopic theory contains only 11 parameters, it agrees well with the experimental data. The comparison is characterized by a rms deviation of 0.859 MeV. For even-even nuclei, the theory agrees within about 600 keV. Larger deviations are observed in this comparison for the odd-A and odd-odd nuclei. Improvements and possible reasons for the deviations are discussed in this contribution as well.

P. W. Zhao; L. S. Song; B. Sun; H. Geissel; J. Meng

2012-12-31T23:59:59.000Z

133

Crucial test for covariant density functional theory with new and accurate mass measurements from Sn to Pa  

Science Journals Connector (OSTI)

The covariant density functional theory with the point-coupling interaction PC-PK1 is compared with new and accurate experimental masses in the element range from 50 to 91. The experimental data are from a mass measurement performed with the storage ring mass spectrometry at Gesellschaft für Schwerionenforschung (GSI) [Chen et al., Nucl. Phys. A 882, 71 (2012)]. Although the microscopic theory contains only 11 parameters, it agrees well with the experimental data. The comparison is characterized by a rms deviation of 0.859 MeV. For even-even nuclei, the theory agrees within about 600 keV. Larger deviations are observed in this comparison for the odd-A and odd-odd nuclei. Improvements and possible reasons for the deviations are discussed in this contribution as well.

P. W. Zhao (???); L. S. Song (???); B. Sun (???); H. Geissel; J. Meng (??)

2012-12-28T23:59:59.000Z

134

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

E-Print Network [OSTI]

A study of 4$\\alpha$ linear-chain structure in high-lying collective excitation states of $^{16}$O with a covariant density functional theory is presented. The low-spin states are obtained by configuration mixing of particle-number and angular-momentum projected quadrupole deformed mean-field states with generator coordinate method. The high-spin states are determined by cranking calculations. These two calculations are based on the same energy density functional PC-PK1. We have found a rotational band at low-spin with the dominated intrinsic configuration considered to be the one that 4$\\alpha$ clusters stay along a common axis. The strongly deformed rod shape also appears in the high-spin region with the angular momentum $13-18\\hbar$; however whether the state is pure $4\\alpha$ linear chain or not is less obvious than that in the low-spin states.

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

2014-03-31T23:59:59.000Z

135

Satellite-Based Modeling of the Carbon Fluxes in Mature Black Spruce Forests in Alaska: A Synthesis of the Eddy Covariance Data and Satellite Remote Sensing Data  

Science Journals Connector (OSTI)

Scaling up of observed point data to estimate regional carbon fluxes is an important issue in the context of the global terrestrial carbon cycle. In this study, the authors proposed a new model to scale up the eddy covariance data to estimate ...

Masahito Ueyama; Yoshinobu Harazono; Kazuhito Ichii

2010-10-01T23:59:59.000Z

136

Implementing an ancilla-free 1?M economical phase-covariant quantum cloning machine with superconducting quantum-interference devices in cavity QED  

Science Journals Connector (OSTI)

We propose a simple scheme to realize 1?M economical phase-covariant quantum cloning machine (EPQCM) with superconducting quantum interference device (SQUID) qubits. In our scheme, multi-SQUIDs are fixed into a microwave cavity by adiabatic passage for their manipulation. Based on this model, we can realize the EPQCM with high fidelity via adiabatic quantum computation.

Long-Bao Yu; Wen-Hai Zhang; Liu Ye

2007-09-17T23:59:59.000Z

137

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

SciTech Connect (OSTI)

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.

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

138

Covariant spectator theory of $np$ scattering:\\\\ Phase shifts obtained from precision fits to data below 350 MeV  

SciTech Connect (OSTI)

Using the covariant spectator theory (CST), we present two one boson exchange kernels that have been successfully adjusted to fit the 2007 world $np$ data (containing 3788 data) below 350 MeV. One model (which we designate WJC-1) has 27 parameters and fits with a chi2/N = 1.06. The other model (designated WJC-2) has only 15 parameters and fits with a chi2/N = 1.12. Both of these models also reproduce the experimental triton binding energy without introducing additional irreducible three-nucleon forces. One result of this work is a new phase shift analysis, updated for all data until 2006, which is useful even if one does not work within the CST. In carrying out these fits we have reviewed the entire data base, adding new data not previously used in other high precision fits and restoring some data omitted in previous fits. A full discussion and evaluation of the 2007 data base is presented.

Franz Gross; Alfred Stadler

2008-02-11T23:59:59.000Z

139

Dynamics of nuclear single-particle structure in covariant theory of particle-vibration coupling: From light to superheavy nuclei  

SciTech Connect (OSTI)

The impact of particle-vibration coupling and polarization effects due to deformation and time-odd mean fields on single-particle spectra is studied systematically in doubly magic nuclei from low-mass {sup 56}Ni up to superheavy ones. Particle-vibration coupling is treated fully self-consistently within the framework of the relativistic particle-vibration coupling model. Polarization effects due to deformation and time-odd mean field induced by odd particle are computed within covariant density functional theory. It has been found that among these contributions the coupling to vibrations makes a major impact on the single-particle structure. The impact of particle-vibration coupling and polarization effects on calculated single-particle spectra, the size of the shell gaps, the spin-orbit splittings and the energy splittings in pseudospin doublets is discussed in detail; these physical observables are compared with experiment. Particle-vibration coupling has to be taken into account when model calculations are compared with experiment since this coupling is responsible for observed fragmentation of experimental levels; experimental spectroscopic factors are reasonably well described in model calculations.

Litvinova, E. V.; Afanasjev, A. V. [GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt, Germany and Institut fuer Theoretische Physik, Goethe-Universitaet, D-60438 Frankfurt am Main (Germany); Department of Physics and Astronomy, Mississippi State University, Mississippi 39762 (United States)

2011-07-15T23:59:59.000Z

140

History of Entomology at The University of Maryland By THEO. L. BISSELL 1  

E-Print Network [OSTI]

in April, 1959 by Anna Perkins Hopper Evans (Mrs. James H. Evans) of Wellesley Hills, Massachusetts, whose mother was Salome J. Hopper. Mrs. Evans knew Glover's widow, who lived with the Hoppers until her death

Gruner, Daniel S.

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Receding Horizon Covariance Control  

E-Print Network [OSTI]

is an embedded submanifold of Rn. An integral curve x(t) of f is a trajectory in M tangent to the vector eld at all points along the curve, i.e. f(x(t)) = _x(t). For every initial condition x0 2 M there exists an > 0 and a neighborhood U of x0 such that x0... is taken into an integral curve x(t) by the ow, which is the map given by ’ : ( ; ) U !M . We adopt the shorthand ’(t; x0) =: ’t(x0) = x(t). It is known that ’t : U ! ’t(U) is a di eomorphism onto its image satisfying ’0(x) = x, ’t+s(x) = ’t ’s...

Wendel, Eric

2012-10-19T23:59:59.000Z

142

Matter Power Spectrum Covariance Matrix from the DEUS-PUR {\\Lambda}CDM simulations: Mass Resolution and non-Gaussian Errors  

E-Print Network [OSTI]

The upcoming generation of galaxy surveys will probe the distribution of matter in the universe with unprecedented accuracy. Measurements of the matter power spectrum at different scales and redshifts will provide stringent constraints on the cosmological parameters. However, on non-linear scales this will require an accurate evaluation of the covariance matrix. Here, we compute the covariance matrix of the matter power spectrum for the concordance $\\Lambda$CDM cosmology from an ensemble of N-body simulations of the Dark Energy Universe Simulation - Parallel Universe Runs (DEUS-PUR). This consists of 12288 realizations of a $(656\\,h^{-1}\\,\\textrm{Mpc})^3$ simulation box with $256^3$ particles. We combine this set with an auxiliary sample of 96 simulations of the same volume with $1024^3$ particles to assess the impact of non-Gaussian uncertainties due to mass resolution effects. We find this to be an important source of systematic errors at high redshift and small intermediate scales. We introduce an empirica...

Blot, Linda; Alimi, Jean-Michel; Reverdy, Vincent; Rasera, Yann

2014-01-01T23:59:59.000Z

143

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

SciTech Connect (OSTI)

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.

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

144

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

E-Print Network [OSTI]

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

145

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

E-Print Network [OSTI]

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.

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

2015-01-29T23:59:59.000Z

146

Bilepton effects on the WWV* vertex in the 331 model with right-handed neutrinos via a SUL(2)×UY(1) covariant quantization scheme  

Science Journals Connector (OSTI)

In a recent paper [J. Montano, F. Ramírez-Zavaleta, G. Tavares-Velasco, and J.?J. Toscano, Phys. Rev. D 72, 055023 (2005).], we investigated the effects of the massive charged gauge bosons (bileptons) predicted by the minimal 331 model on the off-shell vertex WWV* (V=?, Z) using a SUL(2)×UY(1) covariant gauge-fixing term for the bileptons. We proceed along the same lines and calculate the effects of the gauge bosons predicted by the 331 model with right-handed neutrinos. It is found that the bilepton effects on the WWV* vertex are of the same order of magnitude as those arising from the standard model and several of its extensions, provided that the bilepton mass is of the order of a few hundred of GeVs. For heavier bileptons, their effects on the WWV* vertex are negligible. The behavior of the form factors at high energies is also discussed as it is a reflection of the gauge invariance and gauge independence of the WWV* Green function obtained via our quantization method.

F. Ramírez-Zavaleta; G. Tavares-Velasco; J. J. Toscano

2007-04-13T23:59:59.000Z

147

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

E-Print Network [OSTI]

The paper proposes a method to obtain the optimal basis set for solving the self consistent field (SCF) equations for large atomic systems in order to calculate the energy barriers in tunneling structures, with higher accuracy and speed. Taking into account the stochastic-like nature of the samples of all the involved wave functions for many body problems, a statistical optimization is made by considering the covariance matrix of these samples. An eigenvalues system is obtained and solved for the optimal basis set and by inspecting the rapidly decreasing eigenvalues one may seriously reduce the necessary number of vectors that insures an imposed precision. This leads to a potentially significant improvement in the speed of the SCF calculations and accuracy, as the statistical properties of a large number of wave functions in an large spatial domain may be considered. The eigenvalue problem has to be solved only few times, so that the amount of time added may be much smaller that the overall iterating SCF calculations. A simple implementation of the method is presented for a situation where the analytical solution is known, and the results are encouraging.

Sever Spanulescu

2009-12-15T23:59:59.000Z

148

Three lectures on global boundary conditions and the theory of self--adjoint extensions of the covariant Laplace--Beltrami and Dirac operators on Riemannian manifolds with boundary  

E-Print Network [OSTI]

In these three lectures we will discuss some fundamental aspects of the theory of self-adjoint extensions of the covariant Laplace-Beltrami and Dirac operators on compact Riemannian manifolds with smooth boundary emphasizing the relation with the theory of global boundary conditions. Self-adjoint extensions of symmetric operators, specially of the Laplace-Beltrami and Dirac operators, are fundamental in Quantum Physics as they determine either the energy of quantum systems and/or their unitary evolution. The well-known von Neumann's theory of self-adjoint extensions of symmetric operators is not always easily applicable to differential operators, while the description of extensions in terms of boundary conditions constitutes a more natural approach. Thus an effort is done in offering a description of self-adjoint extensions in terms of global boundary conditions showing how an important family of self-adjoint extensions for the Laplace-Beltrami and Dirac operators are easily describable in this way. Moreover boundary conditions play in most cases an significant physical role and give rise to important physical phenomena like the Casimir effect. The geometrical and topological structure of the space of global boundary conditions determining regular self-adjoint extensions for these fundamental differential operators is described. It is shown that there is a natural homology class dual of the Maslov class of the space. A new feature of the theory that is succinctly presented here is the relation between topology change on the system and the topology of the space of self-adjoint extensions of its Hamiltonian. Some examples will be commented and the one-dimensional case will be thoroughly discussed.

A. Ibort

2012-05-16T23:59:59.000Z

149

Estimation of multi-group cross section covariances for {sup 235,238}U, {sup 239}Pu, {sup 241}Am, {sup 56}Fe, {sup 23}Na and {sup 27}Al  

SciTech Connect (OSTI)

This paper presents the methodology used to estimate multi-group covariances for some major isotopes used in reactor physics. The starting point of this evaluation is the modelling of the neutron induced reactions based on nuclear reaction models with parameters. These latest are the vectors of uncertainties as they are absorbing uncertainties and correlation arising from the confrontation of nuclear reaction model to microscopic experiment. These uncertainties are then propagated towards multi-group cross sections. As major breakthroughs were then asked by nuclear reactor physicists to assess proper uncertainties to be used in applications, a solution is proposed by the use of integral experiment information at two different stages in the covariance estimation. In this paper, we will explain briefly the treatment of all type of uncertainties, including experimental ones (statistical and systematic) as well as those coming from validation of nuclear data on dedicated integral experiment (nuclear data oriented). We will illustrate the use of this methodology with various isotopes such as {sup 235,238}U, {sup 239}Pu, {sup 241}Am, {sup 56}Fe, {sup 23}Na and {sup 27}Al. (authors)

De Saint Jean, C.; Archier, P.; Noguere, G.; Litaize, O.; Vaglio-Gaudard, C.; Bernard, D.; Leray, O. [CEA, DEN, DER, Cadarache, F-13108 Saint-Paul-lez-Durance (France)

2012-07-01T23:59:59.000Z

150

Modeling covariance structure in unbalanced longitudinal data  

E-Print Network [OSTI]

and BIC for several models for Kenward?s cattle data. . . . . . . . . . . . . . . . . . . . . . . . . 33 2 Simulation results for fixed-effects models: average maximum like- lihood estimators and Monte Carlo standard deviations from the true model and five... scenarios considered in the simulation study. . . . 34 3 Simulation results for mixed-effects models: average maximum likelihood estimators and Monte Carlo standard deviations from the true model and five scenarios considered in the simulation study. . 55 ix...

Chen, Min

2009-05-15T23:59:59.000Z

151

Optimization Online - Covariance regularization in inverse space  

E-Print Network [OSTI]

May 29, 2009 ... ... large-scale normal distribution in the context of data assimilation from a relatively small number of data from the satellite. Data assimilation is ...

Genta Ueno

2009-05-29T23:59:59.000Z

152

Survival analysis with temporal covariate effects  

Science Journals Connector (OSTI)

......i}n i=1 are regarded as random and {Xi, i, Zi}n i=1 as fixed in K ( ). One...As a result of the one-to-one map- ping between 0(t) and 0(t), 0(t) is...J. Statist. 30, 93111. CHEN, K., JIN, Z. & YING, Z. (2002). Semiparametric......

Limin Peng; Yijian Huang

2007-08-01T23:59:59.000Z

153

Publications  

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

38 results: 38 results: BibTex RIS RTF XML Sort by: Author Title Type [ Year (Desc) ] Filters: Author is Stephane de la Rue du Can [Clear All Filters] 2013 de la du Can, Stephane Rue, Amol Phadke, Greg Leventis, and Anand R. Gopal. A Global Review of Incentive Programs to Accelerate Energy-Efficient Appliances and Equipment., 2013. Letschert, Virginie E., Stephane Rue de la du Can, Michael A. McNeil, Puneeth Kalavase, Allison Hua Fan, and Gabrielle Dreyfus. Energy Efficiency Appliance Standards: Where do we stand, how far can we go and how do we get there? An analysis across several economies., 2013. Leventis, Greg, Anand R. Gopal, Stephane Rue de la du Can, and Amol Phadke. Avoided Electricity Subsidy Payments Can Finance Substantial Appliance Efficiency Incentive Programs: Case Study of Mexico., 2013.

154

Metal oxide/organic interface investigations for photovoltaic devices  

E-Print Network [OSTI]

summarises work I have carried out as a PhD student of the Optoelectronics Group at Cavendish Laboratory of the University of Cambridge since October 2010. I am thankful to the Engineering and Physical Sciences Research Council and the A.G. Leventis... are often used in many other optoelectronic devices such as photovoltaics and light emitting diodes. Sufficiently conducting oxides with the appropriate electron affinities and ionisation potentials, can be employed as charge transport and injection layers...

Pachoumi, Olympia

2014-10-07T23:59:59.000Z

155

Mean and Covariance Structure Analysis of Hierarchical Data  

E-Print Network [OSTI]

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

Bengt O. Muthén

2011-01-01T23:59:59.000Z

156

Ensemble Statistics and Error Covariance of a Rapidly Intensifying Hurricane  

E-Print Network [OSTI]

transformations of normal distributions. Various standard transformations of two Gaussian distributions are made. Skewness, kurtosis, and correlation between the two distributions are taken before and after the transformations. It can be seen that there is a...

Rigney, Matthew C.

2010-01-16T23:59:59.000Z

157

NOTE Communicated by George Gerstein Disambiguating Different Covariation Types  

E-Print Network [OSTI]

method is much more computationally demand- ing, and although it can determine whether latency Massachusetts Institute of Technology #12;1528 Carlos D. Brody tentially have generated the covariogram being) is the binned spiking response of cell i during trial r, the symbol hi represents averaging over trials r

Brody, Carlos

158

and the eddy-covariance system and meteorological station were  

E-Print Network [OSTI]

in tropical plantations (rubber-tree, coco- nut-tree, coffee and eucalypt plantations) managed by the CIRAD the ecosystem and the atmos- phere, ii) identifying the main regulators of gross and net pri- mary production (GPP, NPP) and net ecosystem production (NEP), and iii) parameterizing/ validating ecosystem process

159

Visualization of Anatomic Covariance Tensor Fields Gordon L. Kindlmann1  

E-Print Network [OSTI]

of Utah, UT 2 Laboratory of Neuro Imaging, Brain Mapping Division, Department of Neurology, UCLA School of Medicine, CA Abstract-- The computation, visualization, and interpretation of brain variability remains. The resulting visual- izations support a more detailed characterization of population variability of brain

Utah, University of

160

Free Probability, Sample Covariance Matrices and Stochastic Eigen-Inference  

E-Print Network [OSTI]

Random matrix theory is now a big subject with applications in many disciplines of science, engineering and finance. This talk is a survey specifically oriented towards the needs and interests of a computationally inclined ...

Edelman, Alan

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Conformally covariant boundary correlation functions with a quantum group  

E-Print Network [OSTI]

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.

Kalle Kytölä; Eveliina Peltola

2014-10-23T23:59:59.000Z

162

Manifestly Covariant Gauge-invariant Cosmological Perturbation Theory  

E-Print Network [OSTI]

It is shown that a first-order cosmological perturbation theory for the open, flat and closed Friedmann-Lema\\^itre-Robertson-Walker universes admits one, and only one, gauge-invariant variable which describes the perturbation to the energy density and which becomes equal to the usual Newtonian energy density in the non-relativistic limit. The same holds true for the perturbation to the particle number density. Using these two new variables, a new manifestly gauge-invariant cosmological perturbation theory has been developed. Density perturbations evolve diabatically. Perturbations in the total energy density are gravitationally coupled to perturbations in the particle number density, irrespective of the nature of the particles. There is, in first-order, no back-reaction of perturbations to the global expansion of the universe. Small-scale perturbations in the radiation-dominated era oscillate with an increasing amplitude, whereas in older, less precise treatments, oscillating perturbations are found with a decreasing amplitude. This is a completely new and, obviously, important result, since it makes it possible to explain and understand the formation of massive stars after decoupling of matter and radiation.

P. G. Miedema; W. A. van Leeuwen

2014-10-01T23:59:59.000Z

163

Covariant Spectator Theory of np scattering: Deuteron Quadrupole Moment  

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

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 $\\chi$EFT predictions to order N$^3$LO.

Gross, Franz

2015-01-01T23:59:59.000Z

164

E-Print Network 3.0 - afghanistan introducing population Sample...  

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

Theo Farrell Summary: in Afghanistan points to three such benefits, in particular: More boots on the ground; increased civilian... of the spectrum, such as the 2001 invasion of...

165

E-Print Network 3.0 - afghanistan Sample Search Results  

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

Theo Farrell Summary: in Afghanistan points to three such benefits, in particular: More boots on the ground; increased civilian... of the spectrum, such as the 2001 invasion of...

166

E-Print Network 3.0 - afghanistan post-war governance Sample...  

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

Theo Farrell Summary: in Afghanistan points to three such benefits, in particular: More boots on the ground; increased civilian... require the authorization of all partner...

167

E-Print Network 3.0 - acylase family members Sample Search Results  

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

on biocatalysis that I got due to the members of the "STW-begeleidingscommissie", Nico Boots, Theo Sonke, Jan... and perfectionist), Wynand (ex- PA group member, now computer...

168

Differential Neutron Scattering Cross Sections and Average Neutron Parameters of Tin Isotopes  

Science Journals Connector (OSTI)

The differential cross sections of elastically scattered neutrons were measured for tin isotopes at the...o, s 1/2 1 , S 1/3 ...

V. G. Nikolenko; A. B. Popov; G. S. Samosvat

1983-01-01T23:59:59.000Z

169

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

SciTech Connect (OSTI)

Generalized geologic province information and data on house construction were used to predict indoor radon concentrations in New Hampshire (NH). A mixed-effects regression model was used to predict the geometric mean (GM) short-term radon concentrations in 259 NH towns. Bayesian methods were used to avoid over-fitting and to minimize the effects of small sample variation within towns. Data from a random survey of short-term radon measurements, individual residence building characteristics, along with geologic unit information, and average surface radium concentration by town, were variables used in the model. Predicted town GM short-term indoor radon concentrations for detached houses with usable basements range from 34 Bq/m{sup 3} (1 pCi/l) to 558 Bq/m{sup 3} (15 pCi/l), with uncertainties of about 30%. A geologic province consisting of glacial deposits and marine sediments, was associated with significantly elevated radon levels, after adjustment for radium concentration, and building type. Validation and interpretation of results are discussed.

Apte, M.G.; Price, P.N.; Nero, A.V.; Revzan, K.L.

1998-05-01T23:59:59.000Z

170

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

E-Print Network [OSTI]

1989," New Hampshire Division of Public Health Services andAddendum," New Hampshire Division of Public Health Services

Apte, M.G.

2011-01-01T23:59:59.000Z

171

Examining strategies to improve the carbon balance of corn/soybean agriculture using eddy covariance and  

E-Print Network [OSTI]

if it occurs rapidly. Consequently, there is intense interest in finding ways to damp projected changesExamining strategies to improve the carbon balance of corn/soybean agriculture using eddy There is much interest in the role that agricultural practices might play in sequestering carbon to help offset

Minnesota, University of

172

Planar covariation of limb elevation angles during bipedal walking in the Japanese macaque  

Science Journals Connector (OSTI)

...initial contact of the foot until foot push-off during bipedal walking...the species difference in foot motion with respect to the ground...correlates with net mechanical power expended during human walking...anatomy and mechanics of the foot of humans and macaques. In...

2012-01-01T23:59:59.000Z

173

Eddy-covariance observations of the atmosphere-biosphere exchange of nitrogen oxides  

E-Print Network [OSTI]

from the mean of vertical wind speed and concentration.observed between vertical wind speed and temperature sincethe cospectral density of vertical wind speed and NO X as

Min, Kyung-Eun

2012-01-01T23:59:59.000Z

174

Covarying Hydroclimate Patterns between Monsoonal Asia and North America over the Past 600 Years  

Science Journals Connector (OSTI)

Proxy data with large spatial coverage spanning to the preindustrial era not only provide invaluable material to investigate hydroclimate changes in different regions but also enable studies on temporal changes in the teleconnections between these ...

Keyan Fang; Deliang Chen; Jinbao Li; Heikki Seppä

2014-11-01T23:59:59.000Z

175

Streaming Covariance Selection with Applications to Adaptive Querying in Sensor Networks  

Science Journals Connector (OSTI)

......London, London, UK Handling editor: Nick Jennings Sensor networks can be naturally...revised 1 December 2009 Handling editor: Nick Jennings 1. INTRODUCTION Advances in data...supported by a Royal Society Wolfson Research Merit Award. APPENDIX: GRADIENT DERIVATION......

Christoforos Anagnostopoulos; Niall M. Adams; David J. Hand

2010-11-01T23:59:59.000Z

176

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

E-Print Network [OSTI]

of the concept of "economical maps" by means of the Stinespring representation theorem for completely positive

D'Ariano, Giacomo Mauro

177

Extending the applicability of the eddy-covariance flux-measurement technique.  

E-Print Network [OSTI]

??Surface-atmosphere exchange of momentum, energy and atmospheric constituents affects the atmosphere – from alterations in local microclimates and mesoscale weather to climate modification. These exchange processes… (more)

Nordbo, Annika

2012-01-01T23:59:59.000Z

178

Comparison of models for baryon calculations in a covariant three-body Faddeev approach  

E-Print Network [OSTI]

-preserving truncation. In mesons: Chiral symmetry is formalized by AV-WTI (guarantees massless pions in the chiral limit) Symmetry-preserving truncation. In mesons: Chiral symmetry is formalized by AV-WTI (guarantees massless: Simplest realization of AV-WTI keep only vector part of qg-vertex, µ, Helios Sanchis Alepuz (University

Rossak, Wilhelm R.

179

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

E-Print Network [OSTI]

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

2013-01-01T23:59:59.000Z

180

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

E-Print Network [OSTI]

confidence intervals and testing hypotheses. Their method is applied to a study of the impact of crude oil prices on gasoline prices. Hendry developed the general-to-specific (GETS) procedure for model se, for example, asset prices, whose marginal distributions display strong nonnormal features such as skewness and

Krishnamoorthy, Kalimuthu

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Efficient Small Area Estimation in the Presence of Measurement Error in Covariates  

E-Print Network [OSTI]

Small area estimation is an arena that has seen rapid development in the past 50 years, due to its widespread applicability in government projects, marketing research and many other areas. However, it is often difficult to obtain error-free data...

Singh, Trijya

2012-10-19T23:59:59.000Z

182

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

E-Print Network [OSTI]

al. , 2004]. 2.4.2. Ship Heave Effects on CO 2 Measurement [the effect of heave-induced pressure fluctuations on ship-effect of pressure on air density, the accelerations caused by ship

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

2010-01-01T23:59:59.000Z

183

E-Print Network 3.0 - arranging dirac covariants Sample Search...  

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

of Particle Physics J... to supersymmetry, hyperbolic Dirac equations, and scattering theory. The papers appearing here can be broadly... solutions of elliptic and hyperbolic...

184

Solitary waves in Galilean covariant Fermi field theories with self-interaction  

E-Print Network [OSTI]

The generalized Levy-Leblond equation for a $(3+1)$-dimensional self-interacting Fermi field is considered. Spin up solitary wave solutions with space oscillations in the $x^3$-coordinate are constructed. The solutions are shown to accumulate non-equal amounts of inertial and rest masses.

Saradzhev, Fuad M

2014-01-01T23:59:59.000Z

185

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

SciTech Connect (OSTI)

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.

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

186

LETTER Communicated by Tzyy-Ping Jung A New Approach to Spatial Covariance Modeling of Functional  

E-Print Network [OSTI]

in response to experimental task demands are of particular interest. Among the existing network analyses Massachusetts Institute of Technology #12;Ordinal Trend Canonical Variates Analysis 1603 James R. Moeller jrm8

187

Communication deviance in the families of schizophrenics: a comment on the misuse of analysis of covariance  

Science Journals Connector (OSTI)

...805 (1963). 16. H. A. Johnson and E. P. Cronkite, Radiat. Res. 30, 488 (1967). 17. Supported by NIH grant NS 12776, the late Mrs. Jean Mauze, the American Parkinson's Disease Association, the Charles E. Merrill Trust, and Mrs. Katherine...

JA Woodward; MJ Goldstein

1977-09-09T23:59:59.000Z

188

An ADMM algorithm for matrix completion of partially known state covariances  

E-Print Network [OSTI]

in part by the University of Minnesota Initiative for Renewable Energy and the Environment under Early a convex relaxation based on the nuclear norm. The resulting optimization problem can be cast as a semi to demonstrate the effectiveness of the developed approach. Index Terms-- Alternating direction method

Georgiou, Tryphon T.

189

Eddy-covariance observations of the atmosphere-biosphere exchange of nitrogen oxides  

E-Print Network [OSTI]

and Kesselmeier, J. : Nitrogen dioxide (NO 2 ) uptake byM. : Leaf uptake of nitrogen dioxide (NO 2 ) in a tropicalMorikawa, H. : Atmospheric nitrogen dioxide gas is a plant

Min, Kyung-Eun

2012-01-01T23:59:59.000Z

190

Covariant formulation for the optimal control of jointed arm robots: an alternative to Pontryagin's principle  

E-Print Network [OSTI]

We elaborate algorithms able to efficiently command the actuators of an articulated robot. Our time discretization method is based on cubic and quintic Hermite Finite Elements. The suggested control optimization consists in minimizing directly the selected criterium by a conjugate gradient type algorithm. A generic example illustrates the super convergence of the Hermite's technique.

J. A. Rojas Quintero; C. Vallée; J. P. Gazeau; P. Seguin

2013-05-28T23:59:59.000Z

191

Covariant formulation for the optimal control of jointed arm robots: an alternative to Pontryagin's principle  

E-Print Network [OSTI]

We elaborate algorithms able to efficiently command the actuators of an articulated robot. Our time discretization method is based on cubic and quintic Hermite Finite Elements. The suggested control optimization consists in minimizing directly the selected criterium by a conjugate gradient type algorithm. A generic example illustrates the super convergence of the Hermite's technique.

Quintero, J A Rojas; Gazeau, J P; Seguin, P

2013-01-01T23:59:59.000Z

192

Modelling the angular correlation function and its full covariance in photometric galaxy surveys  

Science Journals Connector (OSTI)

......galaxy surveys, such as the Dark Energy Survey (DES), that extend to high...galaxy surveys, such as the Dark Energy Survey (DES). The expected photo-z...Structure Working group of the Dark Energy Survey for motivating the core of this......

Martín Crocce; Anna Cabré; Enrique Gaztañaga

2011-06-11T23:59:59.000Z

193

Incorporating Ensemble Covariance in the Gridpoint Statistical Interpolation Variational Minimization: A Mathematical Framework  

Science Journals Connector (OSTI)

Gridpoint statistical interpolation (GSI), a three-dimensional variational data assimilation method (3DVAR) has been widely used in operations and research in numerical weather prediction. The operational GSI uses a static background error ...

Xuguang Wang

2010-07-01T23:59:59.000Z

194

New Perspectives On the Relevance of Gravitation for the Covariant Description of Electromagnetically Polarizable Media  

E-Print Network [OSTI]

Electromagnetic properties of a simple polarisable medium may be parameterised in terms of a constitutive tensor whose properties can in principle be determined by experiments in non-inertial (accelerating) frames and in the presence of weak but variable gravitational fields. After establishing some geometric notation, discussion is given to basic concepts of stress, energy and momentum in the vacuum where the useful notion of a drive form is introduced in order to associate the conservation of currents involving the flux of energy, momentum and angular momentum with spacetime isometries. The definition of the stress-energy-momentum tensor is discussed with particular reference to its symmetry based on its role as a source of relativistic gravitation. General constitutive properties of material continua are formulated in terms of spacetime tensors including those that describe magneto-electric phenomena in moving media. This leads to a formulation of a self-adjoint constitutive tensor describing, in general, inhomogeneous, anisotropic, magneto-electric bulk matter in arbitrary motion. The question of an invariant characterisation of intrinsically magneto-electric media is explored. An action principle is established to generate the phenomenological Maxwell system and the use of variational derivatives to calculate stress-energy-momentum tensors is discussed in some detail. The relation of this result to tensors proposed by Abraham and others is discussed in the concluding section where the relevance of the whole approach to experiments on matter in non-inertial environments with variable gravitational and electromagnetic fields is stressed.

T. Dereli; J. Gratus; R. W. Tucker

2006-10-27T23:59:59.000Z

195

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

E-Print Network [OSTI]

uranium concentrations (NURE). Fig. 3. Geologic map of Newuranium concentrations (NURE). New Hampshire Geology Geol.Uranium Resource Evaluation (NURE), which were processed (

Apte, M.G.

2011-01-01T23:59:59.000Z

196

Carbon pools in Mediterranean forests: comparing eddy covariance and GOTILWA+ model results.  

E-Print Network [OSTI]

of water stress on ecosystem function leads to big discrepancies when modelling under these conditions. Recent advances allow us to successfully reproduce water and carbon balances during periods of stress ilex, Pinus ponderosa, and Fagus sylvatica, and varying degrees of water stress and ecosystem responses

Gracia, Carlos

197

Polarization analysis in the wavelet domain based on the adaptive covariance method  

Science Journals Connector (OSTI)

......obtains the following cross-energy matrix The eigenanalysis of...entries of the cross-matrix energy M (t) are given as The eigenvalues...are increasingly used as a cost effective method for a quick...signals and application to geothermal reservoirs, Geophysics, 67......

M. Kulesh; M. S. Diallo; M. Holschneider; K. Kurennaya; F. Krüger; M. Ohrnberger; F. Scherbaum

2007-08-01T23:59:59.000Z

198

Covariant energy-momentum and an uncertainty principle for general relativity  

E-Print Network [OSTI]

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.

F. I. Cooperstock; M. J. Dupre

2014-10-07T23:59:59.000Z

199

Dynamics and Structure of Forecast Error Covariance in the Core of a Developing Hurricane  

E-Print Network [OSTI]

of cloud-resolving forecasts from the Weather Research and Forecasting model (WRF) was used to study error gradients of wind, temperature, and pressure to be concentrated farther from the mean vortex center share a similar axisymmetric transition about the origin, while maintaining a large degree of local

200

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

E-Print Network [OSTI]

is de ned as f(yijj ) = 8 >: y ij 1 , 6= 0; log(yij) , = 0: (2.6) Since the transformation parameter = is one dimensional, the 3rd step of the PSVD procedure becomes a simple optimization problem for a univariate concave function... on the criterion de ned in subsection 2.2.2. On the other hand, the second component is required by 1; 044 nonspiked-in genes without the transformation, but only by 38 with the transformation. We focus on the 6 spiked-in genes that require the two dimensional...

Maadooliat, Mehdi

2012-10-19T23:59:59.000Z

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201

The periodic variations of the covariance and the effect on the probability of collision  

E-Print Network [OSTI]

position of any other catalogued space object fell within a specified box region centered on the estimated SS position, then a collision avoidance maneuver was considered. The dimensions of the conjunction box were + 5 km in the in- track and + 2 km.... Meteoroids are part of the interplanetary environment, and sweep through Earth orbital space at an average speed of 20 km/s. At any one instant, a total of 200 kg of meteoroid mass is within 2000 km of the Earth's surface. Most of this mass is concentrated...

Yang, Jung-Hwa

2002-01-01T23:59:59.000Z

202

Publications  

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

30 results: 30 results: BibTex RIS RTF XML Sort by: Author Title Type [ Year (Desc) ] Filters: Author is Amol Phadke [Clear All Filters] 2013 Shah, Nihar, Paul Waide, and Amol Phadke. Cooling the Planet: Opportunities for Deployment of Superefficient Room Air Conditioners., 2013. Park, Won Young, Amol Phadke, Nihar Shah, and Virginie E. Letschert. "Efficiency Improvement Opportunities in TVs: Implications for Market Transformation Programs." Energy Policy 59 (2013): 361-372. de la du Can, Stephane Rue, Amol Phadke, Greg Leventis, and Anand R. Gopal. A Global Review of Incentive Programs to Accelerate Energy-Efficient Appliances and Equipment., 2013. Sathaye, Nakul, Amol Phadke, Nihar Shah, and Virginie E. Letschert. Potential Global Benefits of Improved Ceiling Fan Energy Efficiency., 2013.

203

Dynamic Analysis and Modeling of Jansen Mechanism  

Science Journals Connector (OSTI)

Abstract Theo Jansen mechanism is gaining wide spread popularity among legged robotics researchers due to its scalable design, energy efficiency, low payload to machine load ratio, bio-inspired locomotion, deterministic foot trajectory among others. In this paper, we present dynamic analysis of a four legged Theo Jansen link mechanism using projection method that results in constraint force and equivalent Lagrange's equation of motion necessary for any meaningful extension and/or optimization of this niche mechanism. Numerical simulations using MaTX is presented in conjunction with the dynamic analysis. This research sets a theoretical basis for future investigation into Theo Jansen mechanism.

Shunsuke Nansai; Mohan Rajesh Elara; Masami Iwase

2013-01-01T23:59:59.000Z

204

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

E-Print Network [OSTI]

correlation plot for vertical wind speed (w) with both HCHOtemperature with vertical wind speed during half-hour? w · c where w is the vertical wind speed, c is the tracer

2011-01-01T23:59:59.000Z

205

3/7/2014 12:42 PM 1 Resolution and Covariance in Generalized Least Squares Inversion  

E-Print Network [OSTI]

both data and prior information to solve for a best-fitting set of model parameters. We review be supplemented with prior information ­ expectations about the nature of the solution that are not directly (GLS), is now central to much of the data processing that occurs in geophysics (and other fields, too

Menke, William

206

Design of high-order short-time approximations as a problem of matching the covariance of a Brownian motion  

E-Print Network [OSTI]

One of the outstanding problems in the numerical discretization of the Feynman-Kac formula calls for the design of arbitrary-order short-time approximations that are constructed in a stable way, yet only require knowledge of the potential function. In essence, the problem asks for the development of a functional analogue to the Gauss quadrature technique for one-dimensional functions. In PRE 69, 056701 (2004), it has been argued that the problem of designing an approximation of order \

Cristian Predescu

2005-08-28T23:59:59.000Z

207

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

E-Print Network [OSTI]

(NEE), latent energy (LE), and sensible heat (H) based on remote sensing indices, climateGlobal patterns of landatmosphere fluxes of carbon dioxide, latent heat, and sensible heat derived

Chen, Jiquan

208

Supplementary Materials Table S1. Landscape covariates used in the development of the Far Eastern leopard model for the  

E-Print Network [OSTI]

. (2002) Vegetation communities agricultural fields, grassland/meadows, regenerating burned or logged) Distance to paved and unpaved roads (not including forest roads) TIGIS roe deer, sika deer and wild boar to Zapovednik (km) 11.7 1831 0 120.1 6.99 8.99 0 32.02 Roe deer 0.748 0.126 0 0.992 0.731 0.097 0 0.998 Sika

Hebblewhite, Mark

209

IN SEARCH OF A PHYSIOLOGICAL BASIS FOR COVARIATIONS IN LIGHT-LIMITED AND LIGHT-SATURATED PHOTOSYNTHESIS1  

E-Print Network [OSTI]

-SATURATED PHOTOSYNTHESIS1 Michael J. Behrenfeld2 National Aeronautics and Space Administration, Goddard Space Flight Center, Department of Oceanography, Halifax, Nova Scotia B3 H 4J1, Canada The photosynthesis-irradiance (PE) of photosynthesis. Variability in PE curves can be separated into two categories: that associated with changes

Babin, Marcel

210

Neuron, Vol. 24, 8793, September, 1999, Copyright 1999 by Cell Press Are Cortical Models Really Bound Review  

E-Print Network [OSTI]

--a feed simple cells all the way up to higher-order "hypercom- forward sequence of more and more complex recognition such as Fukushima's NeocognitronHere, we review the present situation and discuss theo- (1980) or

Riesenhuber, Maximilian

211

AAAS Annual Meeting New York, 24-29 May 1984  

Science Journals Connector (OSTI)

...incidents, hydrologic forecasting, uni-fied operation in divided basin, alternatives to traditional water development. Theo Colborn...Water-bury, David A. Caron, Jed A. Fuhrman. The New York Bight and Its Estuarine Ecosystems: State of Health (26 May, 2...

1984-03-30T23:59:59.000Z

212

Osmogenetics: Aristotle to Arabidopsis  

Science Journals Connector (OSTI)

...explain life better than theology (referring to god, from the ancient Greek theos god; logos talk). Among these, Talete (624-547...potential of a substance, including pressure, particle charge, gravity, and other physical factors...

Albino Maggio; Jian-Kang Zhu; Paul M. Hasegawa; Ray A. Bressan

213

Technische Berichte Nr. 55 des Hasso-Plattner-Instituts fr  

E-Print Network [OSTI]

G¨ohringer (Fraunhofer IOSB) · Matthias Gries (Intel) · Werner Haas (Intel) · Prof. Dr. Hans) · Dr. Felix Salfner (SAP Innovation Center) · Prof. Dr. Bettina Schnor (Uni Potsdam) · Prof. Dr. Theo

Weske, Mathias

214

Semiautomatic carotid lumen segmentation for quantification of lumen geometry in multispectral MRI  

E-Print Network [OSTI]

Hui Tang a,c, , Theo van Walsum a , Robbert S. van Onkelen b , Reinhard Hameeteman a , Stefan Klein van der Lugt a , Lucas J. van Vliet c , Wiro J. Niessen a,c a Biomedical Imaging Group Rotterdam

van Vliet, Lucas J.

215

Gordon Research Conferences  

Science Journals Connector (OSTI)

...242 Mechanical Engineering, University of Minnesota, 111 Church Street, SE, Minneapolis, Minnesota 55455. It is re-quested that abstracts...discussion leader): E. A. Mason, "Cur-rent status of membrane transport theo-ry...

Alexander M. Cruickshank

1980-03-14T23:59:59.000Z

216

Generated using V3.0 of the official AMS LATEX templatejournal page layout FOR AUTHOR USE ONLY, NOT FOR SUBMISSION! Measurement and statistical modeling of the urban heat island of the city of Utrecht  

E-Print Network [OSTI]

Generated using V3.0 of the official AMS LATEX template­journal page layout FOR AUTHOR USE ONLY Netherlands) Theo Brandsma , Dirk Wolters Royal Netherlands Meteorological Institute, De Bilt, The Netherlands

Brandsma, Theo

217

Ammonia at Blodgett Forest, Sierra Nevada, USA  

E-Print Network [OSTI]

of covariance in vertical wind speed with sonic temperature,of covariance in vertical wind speed with sonic temperature,

Fischer, Marc L.; Littlejohn, David

2007-01-01T23:59:59.000Z

218

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

E-Print Network [OSTI]

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 ...

Ferrier, Ken L.

219

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

E-Print Network [OSTI]

presence of electronics and automotive parts manufacturing.1999), automotive parts (Humphrey, 2003) and electronics (Automotive Equipment and Parts (128), Pharmaceuticals and Perfumes (121), Technical/Scientific and Photographic Equipment (118), Electronics (

Mallavarapu, Bravishwar

2013-01-01T23:59:59.000Z

220

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

E-Print Network [OSTI]

and latent constructs (i.e., trait, denoted by 𝜉𝜉). In the MACS model, the observed response 𝑥𝑥𝑖𝑖 to an item i (i = 1, …, p) is represented as a linear function of an intercept 𝜏𝜏𝑖𝑖 , latent trait variables 𝜉𝜉𝑖𝑖 (j = 1, …, m), and a unique... is a p × 1 vector of observed responses (in group g), 𝜏𝜏𝑔𝑔 is a p × 1 vector of intercepts, 𝜉𝜉𝑔𝑔 is an m × 1 vector of latent trait variables, ?𝑔𝑔 is a p × m matrix of factor loadings, and 𝛿𝛿𝑔𝑔 is a p × 1 vector of unique factor...

Lee, Jaehoon

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

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

E-Print Network [OSTI]

Studies Gupta, Poonam, Rana Hasan, and Utsav Kumar. 2009. “58 Gupta, Poonam, Rana Hasan, and Utsav Kumar. 2009. “BigPress. Gupta, Poonam, Rana Hasan, and Utsav Kumar. 2009. “

Mallavarapu, Bravishwar

2013-01-01T23:59:59.000Z

222

Measurements of diurnal variations and Eddy Covariance (EC) fluxes of glyoxal in the1 tropical marine boundary layer: description of the Fast LED-CE-DOAS instrument2  

E-Print Network [OSTI]

marine boundary layer: description of the Fast LED-CE-DOAS instrument2 3 4 S. Coburn1,2 , I. Ortega1 Emitting Diode Cavity Enhanced Differential Optical Absorption24 Spectroscopy (Fast LED-CE-DOAS) instrument Halogens28 and OVOC (TORERO) field experiment (January to March 2012). The Fast LED-CE-DOAS is a29

223

Water and energy exchange above a mixed European Beech – Norway Spruce forest canopy: a comparison of eddy covariance against soil water depletion measurement  

Science Journals Connector (OSTI)

Evapotranspiration of a mixed European beech – Norway spruce forest was measured by means of ... the results by (1) the degree of energy balance closure (EBC), (2) footprint...

H. Schume; H. Hager; G. Jost

2005-06-01T23:59:59.000Z

224

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

E-Print Network [OSTI]

2002. “Does Economic Liberalisation Endanger Indigenous2002. “Does Economic Liberalisation Endanger Indigenous

Mallavarapu, Bravishwar

2013-01-01T23:59:59.000Z

225

Intercomparison of Sensible Heat Flux from Large Aperture Scintillometer and Eddy Covariance Methods: Field Experiment over a Homogeneous Semi-arid Region  

E-Print Network [OSTI]

of satellite remote sensing sensible heat-?ux estimates dueremote sensing algorithms. A typical approach identi?es spectral bands particularly sensitive to surface heat ?

Zeweldi, Dawit A.; Gebremichael, Mekonnen; Wang, Junming; Sammis, Theodore; Kleissl, Jan; Miller, David

2010-01-01T23:59:59.000Z

226

Scale Covariance of Fractal Sets and Measures, A Differential Approach to the Box-Counting Function of a Fractal, with Applications  

E-Print Network [OSTI]

73 The devil’s staircase. . . . . . . . . . . . .defined, dubbed the devil’s staircase, which was rife withcurves such as the “Devil’s Staircase”, and other sets with

Quinn, John Roosevelt

2013-01-01T23:59:59.000Z

227

ESTR -Energy Saving Token Ring Protocol for Wireless Sensor Networks  

E-Print Network [OSTI]

ESTR - Energy Saving Token Ring Protocol for Wireless Sensor Networks Faruk Bagci, Theo Ungerer a long lifetime of the sensor network and the application it is important to save energy. A sensor node control (MAC) protocol for wireless sensor networks, called Energy Saving Token Ring Protocol (ESTR). ESTR

Ungerer, Theo

228

A measurement of G with a cryogenic torsion pendulum  

Science Journals Connector (OSTI)

...One contribution of 13 to a Theo Murphy Meeting Issue The Newtonian constant of gravitation...arid-lands environmental preserve at Hanford in eastern Washington state, where microseismic...www.webfiles.uci.edu/rdnewman/public . Figure 1. Diagram of source mass rings...

2014-01-01T23:59:59.000Z

229

Electric field induced alignment-orientation conversion in diatomic molecules: analysis and observation for NaK  

E-Print Network [OSTI]

rules may be broken, thus leading to align- ment-orientation conversion (AOC) see [1] and refer- ences field strength takes place. The appearance of magnetic field induced AOC in diatomic molecules was observed earlier [2], while Stark effect induced AOC was considered only theo- retically [1,3]. In present

Auzinsh, Marcis

230

Aiming to bring together media scholars from the United States, Canada, and Germany, the conference continues a series of symposia that began in 2007. After ,,Re-Reading McLuhan. An International Conference on Media and  

E-Print Network [OSTI]

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

Paderborn, Universität

231

AROUND KING'S RANK-ONE THEOREMS: FLOWS AND ELISE JANVRESSE, THIERRY DE LA RUE, AND VALERY RYZHIKOV  

E-Print Network [OSTI]

AROUND KING'S RANK-ONE THEOREMS: FLOWS AND Zn -ACTIONS ´ELISE JANVRESSE, THIERRY DE LA RUE, AND VALERY RYZHIKOV Abstract. We study the generalizations of Jonathan King's rank-one theo- rems (Weak-Closure Theorem and rigidity of factors) to the case of rank-one R-actions (flows) and rank-one Zn-actions. We

Paris-Sud XI, Université de

232

Dynamics on the HOCO potential energy surface studied by dissociative photodetachment of HOCO-  

E-Print Network [OSTI]

of heat during hydrocarbon combustion.2 Extensive experimental and theo- retical studies have sought in determining the CO/CO2 balance in combustion and atmospheric chemistry1 and the role it plays in the release orbitals included in the active space was performed by Song et al., reporting a cal- culated heat

Continetti, Robert E.

233

Symposium on bioelectrochemistry of microorganisms. IV. Biochemical fuel cells.  

Science Journals Connector (OSTI)

...ess, one employs a heat engine, the efficiency...the electrochemical "combustion" of a fuel results...intermediate production of heat which, as noted above...leading to the complete combustion of the fuel. The theo...the materials are hydrocarbons or partially oxidized...

K Lewis

1966-03-01T23:59:59.000Z

234

Design of life-size haptic environments Yoky Matsuoka  

E-Print Network [OSTI]

, or software failure, a brake-actuated device is inherently incapable of exceeding the kinetic energy of motion while still allowing us to simulate virtual objects (i.e. to constrain the user's motion inside comparisons to active devices. Theo- retically, we demonstrate that brake-actuated devices surprisingly

Matsuoka, Yoky

235

A NEW CLASS OF RAMSEY-CLASSIFICATION THEOREMS AND THEIR APPLICATIONS IN THE  

E-Print Network [OSTI]

A NEW CLASS OF RAMSEY-CLASSIFICATION THEOREMS AND THEIR APPLICATIONS IN THE TUKEY THEORY OF ULTRAFILTERS NATASHA DOBRINEN AND STEVO TODORCEVIC Abstract. Motivated by Tukey classification problems-classification theo- rems to completely classify all Rudin-Keisler equivalence classes of ultrafilters which are Tukey

Dobrinen, Natasha

236

133rd AAAS Annual Meeting  

Science Journals Connector (OSTI)

...Dis-eases. Life Cycle of the Monarch...Acres-Henriksen; Fundamental Theo-rem of the...DECEMBER 1966 of the diesel engine, Lynwood Bryant...Health). The adrenal cycle, Frederic SCIENCE...of the ARC-jet engine and its application...

1966-12-02T23:59:59.000Z

237

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

E-Print Network [OSTI]

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

238

De Bilt, 2011 | Scientific report; WR 2011-01 Parallel air temperature measurements  

E-Print Network [OSTI]

at the KNMI observatory in De Bilt (the Netherlands) May 2003 - June 2005 | March 14, 2011 Page 6 of 56 #12 observatory in De Bilt (the Netherlands) May 2003 - June 2005 Theo Brandsma #12;#12;Parallel air temperature measurements at the KNMI observatory in De Bilt (the Netherlands) May 2003 - June 2005 Version 1.0 Date March

Haak, Hein

239

Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays  

E-Print Network [OSTI]

to Fukushima's theorem [Fukushima, 1969, 1976] the magnetic effects on the ground due to the field aligned currents within the E region of the ionosphere according to Fukushima's theo- rem for a uniformly above the surface of the Earth [Fukushima, 1969, 1976; Lester et al., 1993]. Thus, a macroscopic picture

California at Berkeley, University of

240

359.ps  

E-Print Network [OSTI]

Jul 24, 2001 ... Department of Industrial Engineering. Bilkent University ...... Varying Covariances

2001-07-24T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Eddy covariance fluxes and vertical concentration gradient measurements of NO and NO[subscript 2] over a ponderosa pine ecosystem: observational evidence for within-canopy chemical removal of NO[subscript x  

E-Print Network [OSTI]

Exchange of NO[subscript x] (NO+NO[subscript 2]) between the atmosphere and biosphere is important for air quality, climate change, and ecosystem nutrient dynamics. There are few direct ecosystem-scale measurements of the ...

Min, K.-E.

242

FINAL REPORT: EDDY-COVARIANCE FLUX TOWER AND TRACER TECHNOLOGY SUPPORT FOR THE UNIVERSITY OF GEORGIA PROPOSAL: FROM TOWER TO PIXEL: INTEGRATION OF PATCH-SIZE NEE USING EXPERIMENTAL MODELING FOOTPRINT ANALYSIS.  

SciTech Connect (OSTI)

Brookhaven National Laboratory has been funded since October of 2000 to provide assistance to the University of Georgia in conducting footprint analyses of individual towers based on meteorology and trace gas measurements. Brookhaven researchers conducted air flow measurements using perfluorocarbon tracers and meteorological instrumentation for three experimental campaigns at an AmeriFlux research site maintained by Dr. Monique Leclerc near Gainesville, FL. In addition, BNL provided assistance with remote data collection and distribution from remote field sites operated by Dr. John Hom of the US Forest Service in the Pine Barrens of New Jersey and at FACE research sites in North Carolina and Wisconsin.

LEWIN,K.F.; NAGY, J.; WATSON, T.B.

2007-09-01T23:59:59.000Z

243

Gas-phase ultraviolet photoelectron spectroscopy and molecular orbital calculations on transition metal carbonyls and nitrosyls  

E-Print Network [OSTI]

. Experimental and Theoretical. Preparation. Spectroscopy. Theo reti ca 1 Theo re ti ca 1 Res ul ts Spectros cop i c Res ul ts CpCr(NO)2C1. CpCr(NO)28r. CpCr(NO)2I. CpW(NO)2C1. CpW(NO)2Br CpW(NO)2I Discussion. PHOTOELECTRON SPECTRA AND MOLECULAR... OF CONTENTS (continued) CHAPTER PAGE Theoretical. Theoretical Results, Spectroscopic Results [CpCr(CO)2]2. [CpMo(CO)2]2. [Cpa(CO) ] . Discussion. CONCLUSIONS. REFERENCES AND NOTES UI TA. 28 29 36 41 41 43 43 46 48 50 TABLE LIST OF TABLES...

Morris-Sherwood, Betty Jeanne

2012-06-07T23:59:59.000Z

244

On the stress distribution in a thin rectangular plate subjected to shear  

E-Print Network [OSTI]

Average Stress, g difference in these Stresses, %max (Theoretica1) ) 'f max (Experimental), gmax (Exeter. ) vs g of C~ (Theo. ), ~rs. ~ 0 ~ ~ 0 Values of "+~" Ca1culated from ELemen- tary Beam Theory for Plate- (2 x 860) ~ ~ ~ ~ ~ /1 and Mrs t 1...) '( thin rectangu3. ar plate The theory of photoelasticity vas employed throughout the observations Ordinarily, it is assumed Chat such a shear stress is distributed uniformly over the section normal to the axis of the body~ in which case...

Travis, Darol Duane

2012-06-07T23:59:59.000Z

245

TrekISM Issue 67  

E-Print Network [OSTI]

: George Murdock; Gleason: Tod Merrill 75. FAMILY (77) by Ronald D. Moore Picard has a strained reunion with his older brother (Jeremy Kemp) when he returns to his home town; while Worfls adoptive Parents (Theo- dore Bikel, Georgia Brown) are hurt by his...- eration crew. Guest Cast: Ashara: Beth Toussaint; Hayne: Don Mirrault; Tan Tsu: Vladimir Velasco; Man #1: Christopher Michael 80. REUNION (80) by Thomas Perry, Jo Perry; Ronald D. Moore and Bramman Braga KIMpec, the dying Klingon leader, asks Picard...

1990-01-01T23:59:59.000Z

246

Citation: K. Hagiwara  

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

b b I (J P ) = 0( 1 2 + ) Charge = - 1 3 e Bottom = -1 b-QUARK MASS b-QUARK MASS b-QUARK MASS b-QUARK MASS The b-quark mass is estimated from bottomonium and B masses. It cor- responds to the "running" mass m b (µ = m b ) in the MS scheme. We have converted masses in other schemes to the MS scheme using two-loop QCD pertubation theory with α s (µ=m b ) = 0.22. The range 4.0-4.5 GeV for the MS mass corresponds to 4.6-5.1 GeV for the pole mass (see the "Note on Quark Masses"). VALUE (GeV) DOCUMENT ID TECN COMMENT 4.0 to 4.5 OUR EVALUATION 4.0 to 4.5 OUR EVALUATION 4.0 to 4.5 OUR EVALUATION 4.0 to 4.5 OUR EVALUATION * * * We do not use the following data for averages, fits, limits, etc. * * * 3.95 ± 0.57 1 ABBIENDI 01S OPAL MS scheme 4.21 ± 0.05 2 KUHN 01 THEO MS scheme 4.05 ± 0.06 3 NARISON 01B THEO MS scheme 4.7 ± 0.74 4 BARATE 00V ALEP MS scheme 4.20 ± 0.06 5 HOANG 00 THEO MS scheme 4.437 + 0.045 - 0.029 6 LUCHA

247

Ecoclimate: Variations, Interactions, and Teleconnections  

E-Print Network [OSTI]

the covariance of vertical wind speed and concentration tothat the mean vertical velocity wind speed is zero on time

Swann, Abigail Lynn Segal

2010-01-01T23:59:59.000Z

248

Against Intentionalism Bernhard Nickel bnickel@fas.harvard.edu  

E-Print Network [OSTI]

acceptable terms.1 If the phenomenol- 1 For example, by giving a causal co-variation account of content

Nickel, Bernhard

249

Combat-related blast injuries : injury types and outcomes  

E-Print Network [OSTI]

blast and PTSD diagnosis as covariates. The interaction of PTSD and injury severity was initially assessed prior to model

Eskridge, Susan Lindsay

2011-01-01T23:59:59.000Z

250

Particle Energy Spectrum, Revisited from a Counting Statistics Perspective  

SciTech Connect (OSTI)

This document is a slide show type presentation of a new covariance estimation for gamma spectra and neutron cross section.

Yuan, D., Marks, D. G., Guss, P. P.

2012-07-16T23:59:59.000Z

251

The reaction $?p \\to ?^\\circ ?^\\prime p$ and the magnetic dipole moment of the $?^+(1232)$ resonance  

E-Print Network [OSTI]

The reaction $\\gamma p \\to \\pi^\\circ \\gamma^\\prime p$ has been measured with the TAPS calorimeter at the Mainz Microtron accelerator facility MAMI for energies between $\\sqrt{s}$ = 1221--1331 MeV. Cross sections differential in angle and energy have been determined for all particles in the final state in three bins of the excitation energy. This reaction channel provides access to the magnetic dipole moment of the $\\Delta^{+}(1232)$ resonance and, for the first time, a value of $\\mu_{\\Delta^+} = (2.7_{-1.3}^{+1.0}(stat.) \\pm 1.5 (syst.) \\pm 3(theo.)) \\mu_N$ has been extracted.

M. Kotulla; J. Ahrens; J. R. M. Annand; R. Beck; G. Caselotti; L. S. Fog; D. Hornidge; S. Janssen; B. Krusche; J. C. McGeorge; I. J. D. McGregor; K. Mengel; J. G. Messchendorp; V. Metag; R. Novotny; M. Pfeiffer; M. Rost; S. Sack; R. Sanderson; S. Schadmand; D. P. Watts

2002-10-31T23:59:59.000Z

252

Semiclassical framework for the calculation of transport anisotropies  

E-Print Network [OSTI]

and well-known phenomenon1?3 with applications in spintronics.4,5 Although the experimental observation of this anisotropic magnetoresistance #1;AMR#2; is rather direct?first accomplished as early as 1857?its theo- retical understanding is far from...; relies on calculating the transport relaxation time #2; from the scattering amplitudes w#1;k#1; ,k#1;#1;#2; between two states on the Fermi surface using 1 #2; =#3; d2k#1;#1;2#3;#2;2w#1;k#1;,k#1;#1;#2;#4;1 ? cos #4;k#1;k#1;#1;#5; . #1;1...

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

2009-01-01T23:59:59.000Z

253

Determination of ?S using OPAL hadronic event shapes at sqrt(s) = 91 - 209 GeV and resummed NNLO calculations  

E-Print Network [OSTI]

Hadronic event shape distributions from e+e- annihilation measured by the OPAL experiment at centre-of-mass energies between 91 GeV and 209 GeV are used to determine the strong coupling {\\alpha}S. The results are based on QCD predictions complete to the next-to- next-to-leading order (NNLO), and on NNLO calculations matched to the resummed next-to-leading-log-approximation terms (NNLO+NLLA). The combined NNLO result from all variables and centre-of-mass energies is {\\alpha}S(mZ0) = 0.1201 {\\pm} 0.0008(stat.) {\\pm} 0.0013(exp.) {\\pm} 0.0010(had.) {\\pm} 0.0024(theo.). while the combined NNLO+NLLA result is {\\alpha}S(mZ0) = 0.1189 {\\pm} 0.0008(stat.) {\\pm} 0.0016(exp.) {\\pm} 0.0010(had.) {\\pm} 0.0036(theo.). The completeness of the NNLO and NNLO+NLLA results with respect to missing higher order contributions, studied by varying the renormalization scale, is improved compared to previous results based on NLO or NLO+NLLA predictions only. The observed energy dependence of {\\alpha}S agrees with the QCD prediction of asymptotic freedom and excludes the absence of running.

The OPAL Collaboration

2011-08-24T23:59:59.000Z

254

Framework for Assessing Viability of Threatened and Endangered Chinook Salmon and Steelhead in the Sacramento–San Joaquin Basin  

E-Print Network [OSTI]

ISAB 2005-2. Portland, OR. Bjornstad ON, Ims RA, Lambin X.covariance function (Bjornstad et al. 1999). Of particular

2007-01-01T23:59:59.000Z

255

Survival analysis for censored data under referral bias.  

E-Print Network [OSTI]

??This work arises from a hepatitis C cohort study and focuses on estimating the effects of covariates on progression to cirrhosis. In hepatitis C cohort… (more)

Wang, Huan

2014-01-01T23:59:59.000Z

256

First Things First  

Science Journals Connector (OSTI)

Objective:...To explore co-variates of patient attitudes likely to predict patients’ willingness to intensify (WTI) their medication regimen.

Dr Brian J. Zikmund-Fisher; Timothy P. Hofer…

2009-12-01T23:59:59.000Z

257

E-Print Network 3.0 - adler-adler resonance parameter Sample...  

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

and 238U: covariance evaluations submitted March 2008 ORNL (resonance ... Source: Danon, Yaron - Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer...

258

E-Print Network 3.0 - afci sampling analysis Sample Search Results  

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

17 Wednesday, April 27, 2011 12;Covariances in ENDFB-VII.1 AFCI effort Source: Danon, Yaron - Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer...

259

E-Print Network 3.0 - analyzing nonstationary financial Sample...  

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

the nonstationary model and analyze the degree and nature of the nonstationarity in the data... Spatial Modelling Using a New Class of Nonstationary Covariance Functions...

260

nus.edu.sg  

E-Print Network [OSTI]

and Defeng Sun. †. June 12, 2008. Abstract. In many applications in finance, insurance, and reinsurance, one seeks a solution of find- ing a covariance matrix

2008-06-13T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

2359.ps  

E-Print Network [OSTI]

Jul 31, 2009 ... learning the zero-pattern of the inverse-covariance matrix. .... 2On the other hand, COVSEL is implemented in C with Matlab interface, ..... nonzeros in the inverse covariance matrix (or the links in the graph) according to their.

262

Generalized Linear Modeling (GLM) Approach to Stochastic Weather Generators RICHARD W. KATZ Institute for Study of Society and Environment, NCAR, rwk@ucar.edu EVA M. FURRER Institute for Mathematics Applied to Geosciences, NCAR, eva@ucar.edu  

E-Print Network [OSTI]

) with a transformed conditional mean expressed as a linear function of covariates X1,...,Xp: g E(Y |X1,...,Xp) = 0 +1X. · Markov chain assumption for precipitation occurrence, Jt = 1 if tth day wet, Jt = 0 if tth day dry variables: (Chandler WRR 2002, Env 2005) · Includes geophysical covariates (e.g., NAO) to Stern & Coe-type

Katz, Richard

263

Infinite dimensional weak Dirichlet processes, stochastic PDEs and optimal control  

E-Print Network [OSTI]

; Tensor analysis; Dirichlet processes; Generalized Fukushima decomposition; Stochastic partial real process X, the forward integral of Y with respect to X and the covariation are defined as follows, Y ]). It is the forward integral of Y with respect to X (resp. the covariation of X and Y ). If X

Paris-Sud XI, Université de

264

THE CORRELATION COEFFICIENTS A generalized method of defining and interpreting correlation coefficients is given. Seven  

E-Print Network [OSTI]

on the ranks of the data. A quick calculation of the rank based correlation coefficients using a 0-1 "graph effect so that they will tend to be small and the net effect is that the covariance will be large. One and the covariance will fluctuate around zero. When there is negative correlation the "distance" from positive

Gideon, Rudy A.

265

Max-Planck-Institut f ur Mathematik  

E-Print Network [OSTI]

; Secondary 81R60. Keywords. Noncommutative Geometry, spectral action principle, standard model of particle physics, generally covariant quantum theory. 1. Introduction The question is not whether god did create covariance, the motion of test particles along geodesics and the assumption that the energy­momentum tensor

266

fur Mathematik in den Naturwissenschaften  

E-Print Network [OSTI]

; Secondary 81R60. Keywords. Noncommutative Geometry, spectral action principle, standard model of particle physics, generally covariant quantum theory. 1. Introduction The question is not whether god did create covariance, the motion of test particles along geodesics and the assumption that the energy-momentum tensor

267

The impact of oil price shocks on the stock market return and volatility relationship  

Science Journals Connector (OSTI)

Abstract This paper examines the impact of structural oil price shocks on the covariance of U.S. stock market return and stock market volatility. We construct from daily data on return and volatility the covariance of return and volatility at monthly frequency. The measures of daily volatility are realized-volatility at high frequency (normalized squared return), conditional-volatility recovered from a stochastic volatility model, and implied-volatility deduced from options prices. Positive shocks to aggregate demand and to oil-market specific demand are associated with negative effects on the covariance of return and volatility. Oil supply disruptions are associated with positive effects on the covariance of return and volatility. The spillover index between the structural oil price shocks and covariance of stock return and volatility is large and highly statistically significant.

Wensheng Kang; Ronald A. Ratti; Kyung Hwan Yoon

2015-01-01T23:59:59.000Z

268

Theory Seminar Schedule  

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

6-2007 6-2007 Click on a title to read an abstract, if available (underlined). 10 July 2007 Special Day: Tuesday, 3:00pm Robert Wiringa Argonne National Laboratory wiringa@theory.phy.anl.gov Dependence of nuclear binding on hadronic mass variation 3 July 2007 Special Day and Time: Tuesday, 10:30am Renato Higa University of Bonn, Germany higa@itkp.uni-bonn.de Coulomb interactions within Halo EFT 5 June 2007 Special Day and Time: Tuesday, 10.30am Omar Benhar Istituto Nazionale di Fisica Nucleare, Rome, Italy benhar@roma1.infn.it The equation of state of neutron star matter and gravitational wave emission 29 May 2007 Special Day: Tuesday Ulrich Mosel Giessen University, Germany Ulrich.Mosel@theo.physik.uni-giessen.de Hadrons in Medium - Theory meets experiment 10 May 2007

269

Argonne Physics Division - Theory Group  

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

Seminars held in the year 2008-2009 Seminars held in the year 2008-2009 Click on a title to read an abstract, if available (underlined). 23 July 2009 Ulrich Mosel University of Giessen Ulrich.Mosel@theo.physik.uni-giessen.de Hadrons in Medium 4 June 2009 Arnoldas Deltuva University of Lisbon deltuva@cii.fc.ul.pt Three- and four-body nuclear reactions 2 June 2009 Special Day: Tuesday Yasuyuki Suzuki Niigata University suzuki@nt.sc.niigata-u.ac.jp Phase-shift calculation using continuum-discretized states 13 May 2009 Special Day: Wednesday William Detmold College of William & Mary and Jefferson Lab wdetmold@wm.edu Many-body lattice QCD 23 April 2009 Shalom Shlomo Cyclotron Institut Texas A&M University, College Station shlomo@comp.tamu.edu Modern energy density functional for nuclei and the nuclear matter Equation of State

270

vcb_vub_s052205-web.dvi  

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

J. J. Beringer et al. (Particle Data Group), PR D86, 010001 (2012) (URL: http://pdg.lbl.gov) June 18, 2012 15:24 - 2- measured in regions previously considered inaccessible, increas- ing the acceptance for B → X u ℓν ℓ transitions and reducing theoretical uncertainties. Experimental measurements of the exclusive B → πℓν ℓ decay are quite precise, and recent improvements in the theo- retical calculation of the form factor normalization have enabled a determination of |V ub | from this decay with an uncertainty below 10%. Throughout this review the numerical results quoted are based on the methods of the Heavy Flavor Averaging Group [2]. DETERMINATION OF |V cb | Summary: The determination of |V cb | from B → D ∗ ℓν ℓ decays is currently at a relative precision of about 2%. The main limitation is the knowledge of the form factor near the maximum momentum transfer to the

271

JOURNAL OF SCIENCE & TECHNOLOGY No. 78A -2010 APPLICATION OF COMPUTATIONAL MODEL  

E-Print Network [OSTI]

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

Thomas, Brian G.

272

nh Gi Thit Hi Ti Nguyn Thin Nhin ca V Trn Du Deepwater Horizon Cc D n Qun Franklin  

E-Print Network [OSTI]

Công Viên Bald Point Ca Tiu Bangc xut s xây dng các mái che cm tri, các li i lót ván, và mt nhà v sinh vi h thng x lý bng khí và bãi thi ti Công Viên Bald Point ca Tiu bang Alligator Point. Ngoài ra u xe kèm theo ti Cash Bayou. Xut Ci To Công Viên và Dc Th Thuyn Qun Franklin: D án Công Viên Indian

273

The mechanical analogy for the flow of gas  

E-Print Network [OSTI]

is shomn in textbooks on the xlnstlo theo'"y o? gases that the nunhsr Of noise;class s strikin- a unit area in o unit tine is given by N~Nu She Awe peamhhee4 Ae %ha pic? ha hpexeaX Aa Xahwhh Xa V ~axles chs ~ ece4lebag cha plat? ia ppopepcloeA ha (Nu...)(Lg) s Xh 1a ?1ea ahoWXX hy RiXXeC4? ChaaXXy Chah so Chat chs xxwebsx' eCx XMxxg che place ie pxopox cioxxaX Co &id("r&) This pors~stsx nay bs Csvslcpsd in tex'xe of Rsoh boxxbsx' SM Reynolds 5Mktsx" by sfQPloyjQQ bbs x slsbioxla R (pVLp hs oos...

Flanagan, Lindley Eric

2012-06-07T23:59:59.000Z

274

Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass  

E-Print Network [OSTI]

The production of beauty and charm quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared 5 energy and pseudorapidity were measured and compared with next-to-leading-order QCD calculations. The beauty and charm contributions to the proton structure functions were extracted from the double-differential cross section as a function of x and Q^2. The running beauty-quark mass, m_b at the scale m_b, was determined from a QCD fit at next-to-leading order to HERA data for the first time and found to be 4.07 \\pm 0.14 (fit} ^{+0.01}_{-0.07} (mod.) ^{+0.05}_{-0.00} (param.) ^{+0.08}_{-0.05} (theo) GeV.

ZEUS collaboration; H. Abramowicz; I. Abt; L. Adamczyk; M. Adamus; R. Aggarwal; S. Antonelli; O. Arslan; V. Aushev; Y. Aushev; O. Bachynska; A. N. Barakbaev; N. Bartosik; O. Behnke; J. Behr; U. Behrens; A. Bertolin; S. Bhadra; I. Bloch; V. Bokhonov; E. G. Boos; K. Borras; I. Brock; R. Brugnera; A. Bruni; B. Brzozowska; P. J. Bussey; A. Caldwell; M. Capua; C. D. Catterall; J. Chwastowski; J. Ciborowski; R. Ciesielski; A. M. Cooper-Sarkar; M. Corradi; F. Corriveau; G. D'Agostini; R. K. Dementiev; R. C. E. Devenish; G. Dolinska; V. Drugakov; S. Dusini; J. Ferrando; J. Figiel; B. Foster; G. Gach; A. Garfagnini; A. Geiser; A. Gizhko; L. K. Gladilin; O. Gogota; Yu. A. Golubkov; J. Grebenyuk; I. Gregor; G. Grzelak; O. Gueta; M. Guzik; W. Hain; G. Hartner; D. Hochman; R. Hori; Z. A. Ibrahim; Y. Iga; M. Ishitsuka; A. Iudin; F. Januschek; I. Kadenko; S. Kananov; T. Kanno; U. Karshon; M. Kaur; P. Kaur; L. A. Khein; D. Kisielewska; R. Klanner; U. Klein; N. Kondrashova; O. Kononenko; Ie. Korol; I. A. Korzhavina; A. Kota?ski; U. Kötz; N. Kovalchuk; H. Kowalski; O. Kuprash; M. Kuze; B. B. Levchenko; A. Levy; V. Libov; S. Limentani; M. Lisovyi; E. Lobodzinska; W. Lohmann; B. Löhr; E. Lohrmann; A. Longhin; D. Lontkovskyi; O. Yu. Lukina; J. Maeda; I. Makarenko; J. Malka; J. F. Martin; S. Mergelmeyer; F. Mohamad Idris; K. Mujkic; V. Myronenko; K. Nagano; A. Nigro; T. Nobe; D. Notz; R. J. Nowak; K. Olkiewicz; Yu. Onishchuk; E. Paul; W. Perla?ski; H. Perrey; N. S. Pokrovskiy; A. S. Proskuryakov; M. Przybycie?; A. Raval; P. Roloff; I. Rubinsky; M. Ruspa; V. Samojlov; D. H. Saxon; M. Schioppa; W. B. Schmidke; U. Schneekloth; T. Schörner-Sadenius; J. Schwartz; L. M. Shcheglova; R. Shehzadi; R. Shevchenko; O. Shkola; I. Singh; I. O. Skillicorn; W. S?omi?ski; V. Sola; A. Solano; A. Spiridonov; L. Stanco; N. Stefaniuk; A. Stern; T. P. Stewart; P. Stopa; J. Sztuk-Dambietz; D. Szuba; J. Szuba; E. Tassi; T. Temiraliev; K. Tokushuku; J. Tomaszewska; A. Trofymov; V. Trusov; T. Tsurugai; M. Turcato; O. Turkot; T. Tymieniecka; A. Verbytskyi; O. Viazlo; R. Walczak; W. A. T. Wan Abdullah; K. Wichmann; M. Wing; G. Wolf; S. Yamada; Y. Yamazaki; N. Zakharchuk; A. F. ?arnecki; L. Zawiejski; O. Zenaiev; B. O. Zhautykov; N. Zhmak; D. S. Zotkin

2014-10-21T23:59:59.000Z

275

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

E-Print Network [OSTI]

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.

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

2013-07-10T23:59:59.000Z

276

b096.dvi  

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

6 6 Z 0 (1865) 3/2 - I (J P ) = 0( 3 2 - ) Status: ∗ OMITTED FROM SUMMARY TABLE This effect is strongly associated with the N K ∗ threshold. See also NODE=B096 the Z 0 (1780). Z 0 (1865) MASS Z 0 (1865) MASS Z 0 (1865) MASS Z 0 (1865) MASS NODE=B096M NODE=B096M VALUE (MeV) DOCUMENT ID TECN COMMENT 1907 NAKAJIMA 82B PWA K N 0.2-1.6 GeV/c 1830 AARON 73 MPWA Isospin-0 K N 0.6-1.6 GeV/c 1840 1 CARROLL 73B CNTR K N I = 0 total σ (fit 2) 1868 ± 10 COOL 70 CNTR K + p, K + d total σ 1860 ± 15 CARTER 67 THEO Dispersion relation Z 0 (1865) WIDTH Z 0 (1865) WIDTH Z 0 (1865) WIDTH Z 0 (1865) WIDTH NODE=B096W NODE=B096W VALUE (MeV) DOCUMENT ID TECN COMMENT 291 NAKAJIMA 82B PWA K N 0.2-1.6 GeV/c 100 AARON 73 MPWA Isospin-0 K N 0.6-1.6 GeV/c 75 1 CARROLL 73B CNTR K N I = 0 total σ (fit 2) 160 ± 30 COOL 70 CNTR 200 ± 50 CARTER 67 THEO Z 0 (1865) DECAY MODES Z 0 (1865) DECAY MODES Z 0 (1865) DECAY MODES Z 0 (1865) DECAY MODES NODE=B096215;NODE=B096 Mode

277

Differential Structure of the Hyperbolic Clifford Algebra  

E-Print Network [OSTI]

This paper presents a thoughful review of: (a) the Clifford algebra Cl(H_{V}) of multivecfors which is naturally associated with a hyperbolic space H_{V}; (b) the study of the properties of the duality product of multivectors and multiforms; (c) the theory of k multivector and l multiform variables multivector extensors over V and (d) the use of the above mentioned structures to present a theory of the parallelism structure on an arbitrary smooth manifold introducing the concepts of covariant derivarives, deformed covariant derivatives and relative covariant derivatives of multivector, multiform fields and extensors fields.

Eduardo A. Notte-Cuello; Waldyr A. Rodrigues Jr

2014-03-13T23:59:59.000Z

278

Dimensional curvature identities on pseudo-Riemannian geometry  

E-Print Network [OSTI]

The curvature tensor of a pseudo-Riemannian metric, and its covariant derivatives, satisfy certain identities that hold on any manifold of dimension less or equal than $n$. In this paper, we re-elaborate recent results by Gilkey-Park-Sekigawa regarding $p$-covariant dimensional curvature identities, for $p=0,2$. To this end, we use the classical theory of natural operations, that allows us to simplify some arguments and to generalize the description of Gilkey-Park-Sekigawa. Thus, our main result describes the first space of $p$-covariant dimensional curvature identities, for any even $p$.

Alberto Navarro; Jose Navarro

2014-07-21T23:59:59.000Z

279

Quantifying the ecosystem-scale emission and deposition fluxes of biogenic volatile organic compounds (BVOC) and their oxidation products above plant canopies  

E-Print Network [OSTI]

covariance plots of vertical wind speed and m/z 127.073 (C 7correlation of vertical wind speed (w) and volume mixingcorrections between vertical wind speed and volume mixing

Park, Jeong-Hoo

2012-01-01T23:59:59.000Z

280

What the Textbooks Say About the Design of Experience  

E-Print Network [OSTI]

This report reviews classical experimental designs including single and multiple factor analysis of variance, analysis of covariance, and Latin squares designs. Assumptions used in the models are presented, and tests for ...

Lamar, Bruce W.

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

The Annals of Statistics 2005, Vol. 33, No. 2, 501521  

E-Print Network [OSTI]

to condense high- dimensional covariates to achieve dimension reduction. Then the estimator of the treatment efficiency bound. 1. Introduction. In many public health problems, an important goal is to study the effect

Zeng, Donglin

282

ALTERNATING DIRECTION METHODS FOR SPARSE ...  

E-Print Network [OSTI]

Since zero entries in the inverse covariance matrix correspond to the conditional ..... All the codes of the ADM approach were written by Matlab 7.1. .... graphs via chordal embedding, Optimization Methods and Software 23 (4) (2008), pp. 501-.

2009-09-04T23:59:59.000Z

283

The Impacts of Representing the Correlation of Errors in Radar Data Assimilation. Part I: Experiments with Simulated Background and Observation Estimates  

Science Journals Connector (OSTI)

In radar data assimilation, statistically optimal analyses are sought by minimizing a cost function in which the variance and covariance of background and observation errors are correctly represented. Radar observations are particular in that they ...

Dominik Jacques; Isztar Zawadzki

2014-11-01T23:59:59.000Z

284

Test particle motion in modified gravity theories  

E-Print Network [OSTI]

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. $\

Mahmood Roshan

2013-02-05T23:59:59.000Z

285

FAST ALTERNATING LINEARIZATION METHODS FOR MINIMIZING ...  

E-Print Network [OSTI]

Feb 9, 2012 ... The nuclear norm minimization problem, which ... is comparable in cost to computing a subgradient of ?X??, or the gradient of the ... graph by estimating a sparse inverse covariance matrix from sample data by solving the ...

2012-02-09T23:59:59.000Z

286

Frequent Antibiotic Use and Second Breast Cancer Events  

Science Journals Connector (OSTI)

...covariates were obtained from health plan administrative databases and medical record review. Frequent antibiotic use was...Subjects were from a single health plan, which may not represent other...being enrolled in a health plan mitigates disparities in care...

Heidi S. Wirtz; Diana S.M. Buist; Julie R. Gralow; William E. Barlow; Shelly Gray; Jessica Chubak; Onchee Yu; Erin J.A. Bowles; Monica Fujii; and Denise M. Boudreau

2013-09-01T23:59:59.000Z

287

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

E-Print Network [OSTI]

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

Watanabe, Shingo

2013-08-26T23:59:59.000Z

288

TURBULENT HEAT FLUXES ABOVE A SUBURBAN RESERVOIR – A CASE STUDY FROM GERMANY  

Science Journals Connector (OSTI)

With the objective of quantifying turbulent sensible (QH) and latent (QE) heat fluxes above a suburban reservoir, a micro-meteorological turbulence measurement campaign using the eddy-covariance technique was carried out between June and November ...

Anja Goldbach; Wilhelm Kuttler

289

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

E-Print Network [OSTI]

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 only under numerous...

Sarkar, Abhra

2014-06-24T23:59:59.000Z

290

Power functions and envelopes for unit root tests  

E-Print Network [OSTI]

This paper studies power functions and envelopes for covariate augmented unit root tests. The power functions are calculated by integrating the characteristic function, allowing accurate evaluation of the power envelope ...

Juhl, Ted P.; Xiao, Z. J.

2003-04-01T23:59:59.000Z

291

Allocation of Economic Capital in loan portfolios  

Science Journals Connector (OSTI)

Since the seminal of Markowitz (1952) and Sharpe (1964) capital allocation within portfolios is based on the variance/covariance analysis. Even the introduction of Value-at-Risk in order to measure risk more a...

Ludger Overbeck

2000-01-01T23:59:59.000Z

292

Mass fluctuation kinetics : analysis and computation of equilibria and local dynamics  

E-Print Network [OSTI]

The mass fluctuation kinetics (MFK) model is a set of coupled first-order differential equations describing the temporal evolution of means, variances and covariances of species concentrations in systems of chemical ...

Azunre, Paul

2009-01-01T23:59:59.000Z

293

Inflammatory Gene Expression in Goats in Response to Transport  

E-Print Network [OSTI]

using trailer location (group) as the experimental unit in a mixed model, repeated measures analysis of variance with compound symmetry and autoregressive covariance structures, depending on the best fit for each model. Percent weight losses were...

Carter, Mark

2012-10-19T23:59:59.000Z

294

Presented at the Workshop on Cartan Connections, Geometry of Homogeneous Spaces, and Dynamics, ESI, Vienna, July 2011 Two-jets of conformal fields along their zero sets  

E-Print Network [OSTI]

Presented at the Workshop on Cartan Connections, Geometry of Homogeneous Spaces, and Dynamics, ESI IR, 2 v = A + Id, or, in coordinates, vj,k + vk,j = gjk . (1) The covariant derivative v is treated

Derdzinski, Andrzej

295

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

E-Print Network [OSTI]

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 ...

Meredith, Laura Kelsey

296

Meso-scale eddies affect near-surface turbulent exchange: evidence from lidar and tower measurements  

Science Journals Connector (OSTI)

The eddy-covariance technique tends to underestimate the turbulent heat fluxes, which results in the non-closure of the surface energy balance. This study shows experimental evidence that meso-scale turbulent organized structures, which are ...

Fabian Eder; Marius Schmidt; Thomas Damian; Katja Träumner; Matthias Mauder

297

Inhomogeneous Background Error Modeling and Estimation over Antarctica  

Science Journals Connector (OSTI)

The structure of the analysis increments in a variational data assimilation scheme is strongly driven by the formulation of the background error covariance matrix, especially in data-sparse areas such as the Antarctic region. The gridpoint ...

Yann Michel; Thomas Auligné

2010-06-01T23:59:59.000Z

298

Controlling Noise in Ensemble Data Assimilation Schemes  

Science Journals Connector (OSTI)

A variety of ad hoc procedures have been developed to prevent filter divergence in ensemble-based data assimilation schemes. These procedures are necessary to reduce the impacts of sampling errors in the background error covariance matrix derived ...

Malaquias Peña; Zoltan Toth; Mozheng Wei

2010-05-01T23:59:59.000Z

299

Energy Intake and Risk of Postmenopausal Breast Cancer: An Expanded Analysis in the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial (PLCO) Cohort  

Science Journals Connector (OSTI)

...high (4.5) diet quality score groups (P 0...survivors with low diet quality scores had lower intake of total energy, protein, carbohydrate...for age and total energy intake (Model 1...covariates and diet quality scores, the risk...

Laura Y. Sue; Catherine Schairer; Xiaomei Ma; Craig Williams; Shih-Chen Chang; Anthony B. Miller; Catherine A. McCarty; Bradley J. Willcox; and Regina G. Ziegler

2009-11-01T23:59:59.000Z

300

Geometry of domains with the uniform squeezing properties  

E-Print Network [OSTI]

For gB and gKE, any order of covariant derivative of the curvature tensor of the metric is .... coordinates (z1, ··· ,zN ) on a coordinate chart U, let eKM = dz1?· · ·?

2010-04-12T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Mathematisches Institut der Universitat Bayreuth Der Geschaftsfuhrende Vorstand  

E-Print Network [OSTI]

, Abteilung Finanzmathematik Fraunhofer ITWM, Kaiserslautern Gast am Lehrstuhl f¨ur Stochastik bei Prof. Dr parameters, i.e.; innovation and error covariances, as well as transition and observations matrices, which

Schittkowski, Klaus

302

Hybrid Bayesian-rank integration approach improves the predictive power of genomic dataset aggregation  

Science Journals Connector (OSTI)

......expression changes (GSE6613) from the remaining datasets that use brain tissue An additional advantage of our BIRRA approach is that...status, including additional covariates, such as gender and brain region, whenever those were applicable and available in GEO......

Marcus A. Badgeley; Stuart C. Sealfon; Maria D. Chikina

2014-10-01T23:59:59.000Z

303

LETELIER, RM, RR BIDIGARE, DV HEBEL, M. ONDRUSEK, CD ...  

Science Journals Connector (OSTI)

May 20, 1992 ... with vertical movements of the ge = 22.45 iso- pycnal, the covariance is at a ... TP pools can be reconciled only by an increase in particle export.

1999-12-24T23:59:59.000Z

304

Improving the modelling of redshift-space distortions – I. A bivariate Gaussian description for the galaxy pairwise velocity distributions  

Science Journals Connector (OSTI)

......with its own mean and covariance matrix. Tests using numerical simulations explicitly...et-al. 2008). However, first accurate tests with simulations showed that the method...bivariate Gaussianity; in Section-3 we test the effectiveness of these assumptions......

Davide Bianchi; Matteo Chiesa; Luigi Guzzo

2015-01-01T23:59:59.000Z

305

SAND2011-6496  

Office of Scientific and Technical Information (OSTI)

2.1 Model definition Let G(u) be a real-valued Gaussian random field with zero mean, unit variance, and covari- ance function c(u, v) EG(u) G(v), where EX denotes the...

306

The black hole dynamical horizon and generalized second law of thermodynamics  

E-Print Network [OSTI]

The generalized second law of thermodynamics for a system containing a black hole dynamical horizon is proposed in a covariant way. Its validity is also tested in case of adiabatically collapsing thick light shells.

Song He; Hongbao Zhang

2007-12-08T23:59:59.000Z

307

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

DOE Patents [OSTI]

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.

Kumar, Aditya; Shi, Ruijie; Dokucu, Mustafa

2013-09-17T23:59:59.000Z

308

RESEARCH ARTICLE Climate and interrelated tree regeneration drivers in mixed  

E-Print Network [OSTI]

RESEARCH ARTICLE Climate and interrelated tree regeneration drivers in mixed temperate regeneration layer composition is driven by numerous interrelated and covarying biotic and abiotic Electronic and strongly affects understory processes and properties including nutrient availabil- ity, seedbed conditions

Minnesota, University of

309

SHORTTOMEDIUMRANGEOCEANFORECASTS:DELIVERYANDOBSERVATIONAL REQUIREMENTS  

E-Print Network [OSTI]

Weather and Climate Research, A partnership of the Bureau of Meteorology and CSIRO, Melbourne 3001 on global performance metrics due to its coverage and statistical covariance with the sub- surface ocean

Brassington, Gary

310

The evolution of primate general and cultural intelligence  

Science Journals Connector (OSTI)

...suggests social, technical and ecological abilities have coevolved in...e.g. [12-16]). Ecological intelligence hypotheses suggest...which measures of social and ecological performance covary [20...primates are a productive vehicle for exploring the psychological...

2011-01-01T23:59:59.000Z

311

Bayesian Estimation of Material Properties in Case of Correlated and Insufficient Data  

E-Print Network [OSTI]

applied in various versions to nancial applications [9], molecular biology and genetics [10], hyperspectral imaging and optics [11]. Coming to Bayesian inference, hierarchical models considering the multivariate covariance matrix in terms of its...

Giugno, Matteo

2013-04-09T23:59:59.000Z

312

Testing complex correlational hypotheses using structural equation modeling  

E-Print Network [OSTI]

It is often of interest to estimate partial or semipartial correlation coefficients as indexes of the linear association between 2 variables after partialing one or both for the influence of covariates. Squaring these ...

Preacher, K. J.

2006-01-01T23:59:59.000Z

313

Improving the Performance of MIQP Solvers for Quadratic Programs ...  

E-Print Network [OSTI]

xjzheng@tongji.edu.cn. Xiaoling Sun ...... Next, we consider 5 instances of (MV) from OR-Library, where the mean vector µ and the covariance matrix Q were ...

2013-09-07T23:59:59.000Z

314

Abstract LB-317: Interactive pipeline for reproducible genomics analyses  

Science Journals Connector (OSTI)

...Interactive pipeline for reproducible genomics analyses Michael Considine 1 Hilary S...Jersey, Ewing Township, NJ. Automated Genomics Analysis (AGA) is a program to analyze...to interactively perform reproducible genomics analysis using clinical covariates in...

Michael Considine; Hilary S. Parker; Yingying Wei; Xiao X. Xia; Leslie Cope; Michael F. Ochs; Elana J. Fertig

2014-10-01T23:59:59.000Z

315

Statistical downscaling of precipitation on a spatially dependent network using a regional climate model  

Science Journals Connector (OSTI)

We present a detailed downscaling simulation methodology for generating precipitation events, conditioned on external climate covariates, on a network of meteorological stations. These events can be input to h...

R. J. Erhardt; L. E. Band; R. L. Smith…

2014-12-01T23:59:59.000Z

316

Generalized Gravity I : Kinematical Setting and reformalizing Quantum Field Theory  

E-Print Network [OSTI]

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.

Johan Noldus

2008-01-28T23:59:59.000Z

317

Transient Analysis of Large-scale Stochastic Service Systems  

E-Print Network [OSTI]

4 Multi-server queue with abandonment and retrials, Mandelbaum et al. (2002) : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 30 5 Comparison of mean values, E X(t) : : : : : : : : : : : : : : : : : : 37 6 Comparison... of covariance matrix entries, Cov X(t); X(t) : : : : : : 39 7 Comparison of mean values, E X(t) : : : : : : : : : : : : : : : : : : 41 8 Comparison of covariance matrices, Cov X(t); X(t) : : : : : : : : : 42 9 Fluid limits in the nearly...

Ko, Young Myoung

2012-07-16T23:59:59.000Z

318

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

E-Print Network [OSTI]

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.

CMS Collaboration

2014-10-24T23:59:59.000Z

319

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

SciTech Connect (OSTI)

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

Abulencia, A.; Acosta, D.; Adelman, Jahred A.; Affolder, T.; Akimoto, T.; Albrow, M.G.; Ambrose, D.; Amerio, S.; Amidei, D.; Anastassov, A.; Anikeev, K.; /Taiwan, Inst.

2006-06-01T23:59:59.000Z

320

Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass  

E-Print Network [OSTI]

The production of beauty and charm quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared 5 content in events with at least one jet have been extracted using the invariant mass of charged tracks associated with secondary vertices and the decay-length significance of these vertices. Differential cross sections as a function of Q^2, Bjorken x, jet transverse energy and pseudorapidity were measured and compared with next-to-leading-order QCD calculations. The beauty and charm contributions to the proton structure functions were extracted from the double-differential cross section as a function of x and Q^2. The running beauty-quark mass, m_b at the scale m_b, was determined from a QCD fit at next-to-leading order to HERA data for the first time and found to be 4.07 \\pm 0.14 (fit} ^{+0.01}_{-0.07} (mod.) ^{+0.05}_{-0.00} (param.) ^{+0.08}_{-0.05} (theo) GeV.

Abramowicz, H; Adamczyk, L; Adamus, M; Aggarwal, R; Antonelli, S; Arslan, O; Aushev, V; Aushev, Y; Bachynska, O; Barakbaev, A N; Bartosik, N; Behnke, O; Behr, J; Behrens, U; Bertolin, A; Bhadra, S; Bloch, I; Bokhonov, V; Boos, E G; Borras, K; Brock, I; Brugnera, R; Bruni, A; Brzozowska, B; Bussey, P J; Caldwell, A; Capua, M; Catterall, C D; Chwastowski, J; Ciborowski, J; Ciesielski, R; Cooper-Sarkar, A M; Corradi, M; Corriveau, F; D'Agostini, G; Dementiev, R K; Devenish, R C E; Dolinska, G; Drugakov, V; Dusini, S; Ferrando, J; Figiel, J; Foster, B; Gach, G; Garfagnini, A; Geiser, A; Gizhko, A; Gladilin, L K; Gogota, O; Golubkov, Yu A; Grebenyuk, J; Gregor, I; Grzelak, G; Gueta, O; Guzik, M; Hain, W; Hartner, G; Hochman, D; Hori, R; Ibrahim, Z A; Iga, Y; Ishitsuka, M; Iudin, A; Januschek, F; Kadenko, I; Kananov, S; Kanno, T; Karshon, U; Kaur, M; Kaur, P; Khein, L A; Kisielewska, D; Klanner, R; Klein, U; Kondrashova, N; Kononenko, O; Korol, Ie; Korzhavina, I A; Kota?ski, A; Kötz, U; Kovalchuk, N; Kowalski, H; Kuprash, O; Kuze, M; Levchenko, B B; Levy, A; Libov, V; Limentani, S; Lisovyi, M; Lobodzinska, E; Lohmann, W; Löhr, B; Lohrmann, E; Longhin, A; Lontkovskyi, D; Lukina, O Yu; Maeda, J; Makarenko, I; Malka, J; Martin, J F; Mergelmeyer, S; Idris, F Mohamad; Mujkic, K; Myronenko, V; Nagano, K; Nigro, A; Nobe, T; Notz, D; Nowak, R J; Olkiewicz, K; Onishchuk, Yu; Paul, E; Perla?ski, W; Perrey, H; Pokrovskiy, N S; Proskuryakov, A S; Przybycie?, M; Raval, A; Roloff, P; Rubinsky, I; Ruspa, M; Samojlov, V; Saxon, D H; Schioppa, M; Schmidke, W B; Schneekloth, U; Schörner-Sadenius, T; Schwartz, J; Shcheglova, L M; Shehzadi, R; Shevchenko, R; Shkola, O; Singh, I; Skillicorn, I O; S?omi?ski, W; Sola, V; Solano, A; Spiridonov, A; Stanco, L; Stefaniuk, N; Stern, A; Stewart, T P; Stopa, P; Sztuk-Dambietz, J; Szuba, D; Szuba, J; Tassi, E; Temiraliev, T; Tokushuku, K; Tomaszewska, J; Trofymov, A; Trusov, V; Tsurugai, T; Turcato, M; Turkot, O; Tymieniecka, T; Verbytskyi, A; Viazlo, O; Walczak, R; Abdullah, W A T Wan; Wichmann, K; Wing, M; Wolf, G; Yamada, S; Yamazaki, Y; Zakharchuk, N; ?arnecki, A F; Zawiejski, L; Zenaiev, O; Zhautykov, B O; Zhmak, N; Zotkin, D S

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Regularizing role of teleparallelism  

E-Print Network [OSTI]

The properties of the gravitational energy-momentum 3-form and of the superpotential 2-form are discussed in the covariant teleparallel framework, where the Weitzenb\\"ock connection represents inertial effects related to the choice of the frame. Due to its odd asymptotic behavior, the contribution of the inertial effects often yields unphysical (divergent or trivial) results for the total energy of the system. However, in the covariant teleparallel approach, the energy is always finite and nontrivial. The teleparallel connection plays a role of a regularizing tool which subtracts the inertial effects without distorting the true gravitational contribution. As a crucial test of the covariant formalism, we reanalyze the computation of the total energy of the Schwarzschild and the Kerr solutions.

Tiago Gribl Lucas; Yuri N. Obukhov; J. G. Pereira

2009-09-13T23:59:59.000Z

322

Octet Baryon Electromagnetic Form Factors in a Relativistic Quark Model  

SciTech Connect (OSTI)

We study the octet baryon electromagnetic properties by applying the covariant spectator quark model, and provide covariant parametrization that can be used to study baryon electromagnetic reactions. While we use the lattice QCD data in the large pion mass regime (small pion cloud effects) to determine the parameters of the model in the valence quark sector, we use the nucleon physical and octet baryon magnetic moment data to parameterize the pion cloud contributions. The valence quark contributions for the octet baryon electromagnetic form factors are estimated by extrapolating the lattice parametrization in the large pion mass regime to the physical regime. As for the pion cloud contributions, we parameterize them in a covariant, phenomenological manner, combined with SU(3) symmetry. We also discuss the impact of the pion cloud effects on the octet baryon electromagnetic form factors and their radii.

Gilberto Ramalho, Kazuo Tsushima

2011-09-01T23:59:59.000Z

323

Regularizing role of teleparallelism  

SciTech Connect (OSTI)

The properties of the gravitational energy-momentum 3-form and of the superpotential 2-form are discussed in the covariant teleparallel framework, where the Weitzenboeck connection represents inertial effects related to the choice of the frame. Because of its odd asymptotic behavior, the contribution of the inertial effects often yields unphysical (divergent or trivial) results for the total energy of the system. However, in the covariant teleparallel approach, the energy is always finite and nontrivial. The teleparallel connection plays a role of a regularizing tool which subtracts the inertial effects without distorting the true gravitational contribution. As a crucial test of the covariant formalism, we reanalyze the computation of the total energy of the Schwarzschild and the Kerr solutions.

Lucas, Tiago Gribl; Obukhov, Yuri N.; Pereira, J. G. [Instituto de Fisica Teorica, UNESP-Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz 271, 01140-070 Sao Paulo (Brazil); Instituto de Fisica Teorica, UNESP-Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz 271, 01140-070 Sao Paulo, Brazil and Department of Theoretical Physics, Moscow State University, 117234 Moscow (Russian Federation); Instituto de Fisica Teorica, UNESP-Universidade Estadual Paulista, Rua Dr. Bento Teobaldo Ferraz 271, 01140-070 Sao Paulo (Brazil)

2009-09-15T23:59:59.000Z

324

Monitoring variability of multivariate processes  

Science Journals Connector (OSTI)

The paper focuses on determining changes in process variability of multivariate processes. The problem is compounded by the fact that any of the elements in the variance-covariance matrix of variables could change, leading to a change in the process variability. While it may not be feasible to maintain individual control charts for each element of the variance-covariance matrix, some aggregate measure of the variability criteria could be monitored to initially determine if a change has occurred in the process variability. A couple of aggregate measures are proposed and the performance of these suggested measures is explored through a simulation procedure. Compared to the traditional method, which monitors the determinant of the variance-covariance matrix, these alternatives perform well. The performance measure used is the mean time to first detection of a change in the process variability.

Amitava Mitra; Mark Clark

2014-01-01T23:59:59.000Z

325

Relativistic two-body system in (1+1)-dimensional QED. 1. On the circle S{sup 1}  

SciTech Connect (OSTI)

From the coupled Maxwell-Dirac equations for two fermion fields {Psi}{sub 1}, {Psi}{sub 2} the authors derive a covariant two-body equation for the composite field {Phi}(x{sub 1}, x{sub 2}) in configuration space which includes radiative self-energy effects. Both Coulomb gauge and covariant gauge have been used and their equivalence is proved. For the space S{sup 1} the authors solve the two-body equation with mutual interactions exactly and obtain the mass spectrum in the case of massless fermions. 7 refs., 5 figs.

Barut, A.O. [Univ. of Colorado, Boulder, CO (United States)] [Univ. of Colorado, Boulder, CO (United States); [International Centre for Theoretical Physics, Trieste (Italy); Saradzhev, F.M. [Academy of Sciences of Azerbaijan, Baku (Azerbaijan)] [Academy of Sciences of Azerbaijan, Baku (Azerbaijan); [International Centre for Theoretical Physics, Trieste (Italy)

1994-10-01T23:59:59.000Z

326

Magnetic fields from second-order interactions  

E-Print Network [OSTI]

It is well known that when two types of perturbations interact in cosmological perturbation theory, the interaction may lead to the generation of a third type. In this article we discuss the generation of magnetic fields from such interactions. We determine conditions under which the interaction of a first-order magnetic field with a first-order scalar-or vector-, or tensor-perturbations would lead to the generation of second order magnetic field. The analysis is done in a covariant-index-free approach, but could be done in the standard covariant indexed-approach.

Bob Osano

2014-03-21T23:59:59.000Z

327

Effect of Railroad Deregulation on Export - Grain Transportation Rate Structures.  

E-Print Network [OSTI]

monthly corn price spreads between 18 hinterland re gions in Iowa, Illinois, and Indiana and Gulf and/or Atlan tic Coast ports. Parameter estimates for the Plains and Corn Belt covariance models are presented in Table 2.1 The signs IThe Durbin... Regression Coefficients for the Plains and Corn Belt Covariance Modell Variable INTERCEPT EXPO FSUP WAGE T-BILL EXPECT RUI STOR TIME OINTER OSLOPE BRAT COAST JAN FEB MAR APR MAY TUN JUL AUG SEP OCT NOV TXTRI TXNOC TXSOL KSNW...

Fuller, Stephen; MacDonald, James; Bessler, David; Wohlgenant, Michael

1988-01-01T23:59:59.000Z

328

Gravity with a dynamical preferred frame  

E-Print Network [OSTI]

We study a generally covariant model in which local Lorentz invariance is broken "spontaneously" by a dynamical unit timelike vector field $u^a$---the "aether". Such a model makes it possible to study the gravitational and cosmological consequences of preferred frame effects, such as ``variable speed of light" or high frequency dispersion, while preserving a generally covariant metric theory of gravity. In this paper we restrict attention to an action for an effective theory of the aether which involves only the antisymmetrized derivative $\

Ted Jacobson; David Mattingly

2001-06-02T23:59:59.000Z

329

Tensor distributions on signature-changing space-times  

E-Print Network [OSTI]

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.

David Hartley; Robin W. Tucker; Philip A. Tuckey; Tevian Dray

1997-01-21T23:59:59.000Z

330

On the Energy-Momentum Density of Gravitational Plane Waves  

E-Print Network [OSTI]

By embedding Einstein's original formulation of GR into a broader context we show that a dynamic covariant description of gravitational stress-energy emerges naturally from a variational principle. A tensor $T^G$ is constructed from a contraction of the Bel tensor with a symmetric covariant second degree tensor field $\\Phi$ and has a form analogous to the stress-energy tensor of the Maxwell field in an arbitrary space-time. For plane-fronted gravitational waves helicity-2 polarised (graviton) states can be identified carrying non-zero energy and momentum.

T. Dereli; R. W. Tucker

2004-01-20T23:59:59.000Z

331

Linear Diagnostics to Assess the Performance of an Ensemble Forecast System  

E-Print Network [OSTI]

. The mathematical model we adopt to predict the evolution of uncertainty in a local state estimate (analysis or forecast), xe, is based on the assumption that the error in the state estimate, ? = xe ? xt, (2.1) *Portions of this chapter have been reprinted from... variable. In Equation (2.1) xt is the model representation of the, in practice unknown, true state of the atmosphere. The covariance between the different components of ? is described by the error covariance matrix P`. We employ a K-member ensemble...

Satterfield, Elizabeth A.

2011-10-21T23:59:59.000Z

332

Valence quark and meson cloud contributions to the $?^\\ast N \\to N^\\ast(1520)$ form factors  

E-Print Network [OSTI]

The covariant spectator quark model is applied to the $\\gamma^\\ast N \\to N^\\ast(1520)$ reaction. The valence quark contributions to the electromagnetic form factors and helicity transition amplitudes are estimated from the covariant structure of the $N^\\ast(1520)$ wave function calibrated by the experimental data for large squared momentum transfer $Q^2$. The difference between the model results and the experimental data is then used to parameterize the low $Q^2$ behavior, where meson cloud effects are assumed to dominate. This parametrization can be very useful for future studies of the reaction, as well as for the extension of the transition form factors to the timelike region.

G. Ramalho; M. T. Peña

2014-05-20T23:59:59.000Z

333

Generators of Coordinate Transformations in the Penrose Formalism of General Relativity  

Science Journals Connector (OSTI)

A new covariant expression for the generator of coordinate transformations is developed in the general theory of relativity. It is hoped that this expression may facilitate the determination of the commutation relations between the independent dynamical variables of Penrose. Since the Penrose function is defined on a characteristic surface, a program for quantization is discussed which can be applied to dynamical variables defined on such null surfaces. In addition, the relationship of the new conservation law to the usual physical constants of Lorentz-covariant theories is indicated, the relationship being effected when there exists a Killing bivector in the Riemannian manifold.

Arthur Komar

1962-08-01T23:59:59.000Z

334

Monopole vector spherical harmonics  

Science Journals Connector (OSTI)

Eigenfunctions of total angular momentum for a charged vector field interacting with a magnetic monopole are constructed and their properties studied. In general, these eigenfunctions can be obtained by applying vector operators to the monopole spherical harmonics in a manner similar to that often used for the construction of the ordinary vector spherical harmonics. This construction fails for the harmonics with the minimum allowed angular momentum. These latter form a set of vector fields with vanishing covariant curl and covariant divergence, whose number can be determined by an index theorem.

Erick J. Weinberg

1994-01-15T23:59:59.000Z

335

Download  

Science Journals Connector (OSTI)

Estuarine Research Center, Academy of Natural Sciences, 10545 Mackall Rd., ... rank or develop a hierarchy of factors contributing to settle- ment patterns (but see Wethey 1986). Lastly, larval settle- ment cues often co-vary (e.g. gas solubility with tempera- .... substrate, (E) gear-drive and faceplate attachment plate, (F) low.

2000-10-17T23:59:59.000Z

336

International Journal of Robotics Research, vol 22, No.6, pages 371-393, c 2003 Sage Publications  

E-Print Network [OSTI]

Estimating Articulated Human Motion With Covariance Scaled Sampling Cristian Sminchisescu Bill Triggs INRIA matching. 1 Introduction Extracting 3D human motion from natural monocular video sequences poses difficult to mistracking, so reliable tracking requires a powerful multiple hypothesis tracker capable of finding

Bebendorf, Mario

337

An empirical explanation of the flash-lag effect  

Science Journals Connector (OSTI)

...been used to increase the explanatory power of these approaches. Explanations of...corresponds to the approximate limits of human motion perception) (52). This procedure yielded...1984 ) Temporal covariance model of human motion perception . J Opt Soc Am A 1 : 451...

William T. Wojtach; Kyongje Sung; Sandra Truong; Dale Purves

2008-01-01T23:59:59.000Z

338

Agriculture, Ecosystems and Environment 144 (2011) 319329 Contents lists available at SciVerse ScienceDirect  

E-Print Network [OSTI]

Sistema Terrestre, Instituto Nacional de Pesquisas Espaciais, Cachoeira Paulista, SP, Brazil b Energy. © 2011 Elsevier B.V. All rights reserved. 1. Introduction Clean and renewable sources of energy covariance technique was used to calculate fluxes of carbon dioxide and energy balance components

DeLucia, Evan H.

339

Proper Orthogonal Decomposition-Based Modeling, Analysis, and Simulation of Dynamic Wind Load  

E-Print Network [OSTI]

Proper Orthogonal Decomposition-Based Modeling, Analysis, and Simulation of Dynamic Wind Load.1061/ ASCE 0733-9399 2005 131:4 325 CE Database subject headings: Simulation; Wind loads; Buildings; Random on the decomposition of the covariance and XPSD matrices is presented. A physically meaningful linkage between the wind

Chen, Xinzhong

340

Boussinesq-type equations from nonlinear realizations of $W_3$  

E-Print Network [OSTI]

We construct new coset realizations of infinite-dimensional linear $W_3^{\\infty}$ symmetry associated with Zamolodchikov's $W_3$ algebra which are different from the previously explored $sl_3$ Toda realization of $W_3^{\\infty}$. We deduce the Boussinesq and modified Boussinesq equations as constraints on the geometry of the corresponding coset manifolds.The main characteristic features of these realizations are:i. Among the coset parameters there are the space and time coordinates $x$ and $t$ which enter the Boussinesq equations, all other coset parameters are regarded as fields depending on these coordinates;ii. The spin 2 and 3 currents of $W_3$ and two spin 1 $U(1)$ Kac- Moody currents as well as two spin 0 fields related to the $W_3$currents via Miura maps, come out as the only essential parameters-fields of these cosets. The remaining coset fields are covariantly expressed through them;iii.The Miura maps get a new geometric interpretation as $W_3^{\\infty}$ covariant constraints which relate the above fields while passing from one coset manifold to another; iv. The Boussinesq equation and two kinds of the modified Boussinesq equations appear geometrically as the dynamical constraints accomplishing $W_3^{\\infty}$ covariant reductions of original coset manifolds to their two-dimensional geodesic submanifolds;v. The zero-curvature representations for these equations arise automatically as a consequence of the covariant reduction. The approach proposed could provide a universal geometric description of the relationship between $W$-type algebras and integrable hierarchies.

E. Ivanov; S. Krivonos; R. P. Malik

1992-10-10T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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341

Sankhya : The Indian Journal of Statistics 2008, Volume 70-A, Part 1, pp. 1-24  

E-Print Network [OSTI]

Sankhy¯a : The Indian Journal of Statistics 2008, Volume 70-A, Part 1, pp. 1-24 c 2008, Indian of sparsity in the context of nonparametric regres- sion and covariance matrix estimation. We point to low In a pathbreaking RSS discussion paper in 1995, Donoho, Johnstone, Hoch and Stern pointed out the importance

Bickel, Peter

342

MATH 531: Statistical Methods II Spring 2012 Department of Applied Mathematics and Statistics, CSM Syllabus  

E-Print Network [OSTI]

for the development of valid regres- sion models will be covered. Analysis of covariance and one and two: 1. Understand the settings wherein simple linear regression, multiple linear regres- sion software package of your choosing) to perform re- gression analysis of real data sets. #12;Course Outline

343

Analysis of Complementarity Requirements for Plant MicroRNA Targeting Using a Nicotiana benthamiana Quantitative Transient Assay  

Science Journals Connector (OSTI)

...sequencing|MFE, minimum free energy|ANCOVA, analysis of covariance...led to the neglect of a wider constellation of less complementary sites...2005) and the minimum free energy (MFE) ratio between the site...Structure Analyses Hybridization energy between miRNAs and corresponding...

Qikun Liu; Feng Wang; Michael J. Axtell

2014-02-07T23:59:59.000Z

344

The Annals of Statistics 2004, Vol. 32, No. 4, 15331555  

E-Print Network [OSTI]

models to condense these high-dimensional covariates in dimension reduction; then an estimate be problematic due to the high dimensionality of the auxiliary information. In this paper, we use two working the efficiency bound. 1. Introduction. Right-censored data with dependent censoring are common in many

Zeng, Donglin

345

Fermions in d = 1 + 2 dimensions from first principles  

SciTech Connect (OSTI)

In this work we construct states describing planar electrons ('spin' (1/2) particles with well defined parity) in d = 1 + 2 from first principles and show that they satisfy Dirac equation, which turns out to be the covariant form of the eigenvalue equation for spatial inversion (parity) just like in d = 1 + 3.

Carrillo-Ruiz, Ma. Georgina; Napsuciale, Mauro [Instituto de Fisica, Universidad de Guanajuato, Lomas del Basque 103, Fracc. Lomas del Campestre, C.P. 37150, Leon Gto. (Mexico)

2006-09-25T23:59:59.000Z

346

Bayesian analysis of single-subject fMRI data: SPM5 implementation  

E-Print Network [OSTI]

the AR coefficients A. The parameters control the observation noise precision at each voxel. The graph in fMRI (eg. 300- 400 scans) this creates a bottleneck when implementing the algorithm in MATLAB the following cross-covariances. This first set of terms depends on the design matrix only and therefore can

Penny, Will

347

Feedbacks of sea surface temperature to wintertime storm tracks in the North Atlantic  

Science Journals Connector (OSTI)

In this study the lagged maximum covariance analysis is performed on winter storm-track anomalies, represented by the meridional heat flux by synoptic-scale (2-8 days) transient eddies, and sea surface temperature (SST) anomalies in the North ...

Bolan Gan; Lixin Wu

348

Flow of fractal fluid in pipes: Non-integer dimensional space Vasily E. Tarasov  

E-Print Network [OSTI]

and a notion of density of states [4] are used; (4) Fractal media can be described by using the theory: www.elsevier.com/locate/chaos #12;book by Collins [33] for rotationally covariant functions of the numerical factor in the density of states is fixed by the equation of the volume of non-integer dimensional

Tarasov, Vasily E.

349

Chance–Constrained Linear Matrix Inequalities with Dependent ...  

E-Print Network [OSTI]

Jan 27, 2011 ... convex optimization and probability theory, has created a surge of interest in finding .... of (1) is known for various classes of uncertainty sets; see the book [3] ... (such as the density function or the covariance matrix of ?), or by ...

2011-01-27T23:59:59.000Z

350

Note on bosonic open strings in a constant B field  

Science Journals Connector (OSTI)

We sketch the main steps of old covariant quantization of bosonic open strings in a constant B field background. We comment on its space-time symmetries and the induced effective metric. The low-energy spectrum is evaluated and the appearance of a new noncommutative gauge symmetry is addressed.

Ansar Fayyazuddin and Maxim Zabzine

2000-07-21T23:59:59.000Z

351

Inertial Force, Equivalence Principle and Quantum Mechanics  

E-Print Network [OSTI]

On the basis of a manifestly covariant formalism of non-relativistic quantum mechanics in general coordinate systems, proposed by us recently, we derive general expressions for inertial forces. The results enable us further to discuss, and to explain the validity of, the equivalence principle in non-relativistic quantum mechanics.

Minoru Omote; Susumu Kamefuchi

2000-05-10T23:59:59.000Z

352

Large-sample estimation of parameters for movingaverage models  

Science Journals Connector (OSTI)

......normal form with mean O and covariance matrix W = (wti), where 00 > +j + 2 PiPiPl-2...conveniently determined from the set of equations I c{3(p)wti(p) =-wti(9) (j = h + l,...,k) (9) which they clearly......

A. M. WALKER

1961-12-01T23:59:59.000Z

353

Anomalously Metal-Rich Fluids Form Hydrothermal Ore Deposits  

Science Journals Connector (OSTI)

...Ireland were collected from historic mine exposures and drill core...empirical covariation in modern basin brines (4, 6, 24–26) and...S. mid-continent in the Permian via sulfide oxidation (27...heterogeneity in modern sedimentary basins (6) imply inefficiency of...

Jamie J. Wilkinson; Barry Stoffell; Clara C. Wilkinson; Teresa E. Jeffries; Martin S. Appold

2009-02-06T23:59:59.000Z

354

Electromagnetic Radiation in Accelerated Systems  

Science Journals Connector (OSTI)

A generally covariant set of electromagnetic field equations and associated constitutive relations is developed to deal with electromagnetic radiation in arbitrarily moving media. The equations are sufficiently general to include dispersive as well as nonisotropic media. Several special cases are investigated to illustrate the method and to demonstrate the consistency of the formulation.

J. L. Anderson and J. W. Ryon

1969-05-25T23:59:59.000Z

355

Conserved charges in 3D gravity  

Science Journals Connector (OSTI)

The covariant canonical expression for the conserved charges, proposed by Nester, is tested on several solutions in three-dimensional gravity with or without torsion and topologically massive gravity. In each of these cases, the calculated values of energy momentum and angular momentum are found to satisfy the first law of black hole thermodynamics.

M. Blagojevi? and B. Cvetkovi?

2010-06-09T23:59:59.000Z

356

Editorial Focus What Makes Whiskers Shake? Focus on "Current Flow in Vibrissa Motor  

E-Print Network [OSTI]

that electric activity throughout the depth of motor cortex covaries with whisker EMGs and hence demonstrates that rhythmic electric stimulation of vibrissa motor cortex can evoke whisking-like movementsEditorial Focus What Makes Whiskers Shake? Focus on "Current Flow in Vibrissa Motor Cortex Can

Kleinfeld, David

357

Use of Sun-Protective Clothing at Outdoor Leisure Settings from 1992 to 2002: Serial Cross-sectional Observation Survey  

Science Journals Connector (OSTI)

...local authorities with sun protection policies for...teenagers and adults use of sun-protective clothing...environmental factors (temperature, wind, cloud cover...associated with peoples use of sun-protective clothing...covariates. Table 1 Table 1. Distribution of body cover index...

Helen G. Dixon; Magdalena Lagerlund; Matthew J. Spittal; David J. Hill; Suzanne J. Dobbinson; and Melanie A. Wakefield

2008-02-01T23:59:59.000Z

358

A perspective on sustained marine observations for climate modelling and prediction  

Science Journals Connector (OSTI)

...of the surge on coastal buildings and infrastructure. On longer forecast time scales of weeks...iterative approach that effectively creates hybrid observed-model covariances. These...The finer resolution of the ORCA025 grid (a) is eddy permitting and allows for...

2014-01-01T23:59:59.000Z

359

Estimating brain functional connectivity with sparse multivariate autoregression  

Science Journals Connector (OSTI)

...covariance matrix of the innovations...defined by equation (2.1...expect the matrix B to be very...During the process of implementing...implemented in Matlab 7.0 and...Description of simulations In order...02-12.pdf .) Data...Supplement: The Matlab formulation...these neural processes through the...Extensive simulations were performed...

2005-01-01T23:59:59.000Z

360

Extended abstract, 17th Conference on Numerical Weather Prediction August 1-5, 2005, Washington DC.  

E-Print Network [OSTI]

, a network of sensors collected numerous water vapor data. This network included ground-based GPS receivers in recovering 3D moisture information. To date, most variational analysis systems use static background error background term. Ha et al. (2003) assumed the background error covariance is diagonal in their four

Xue, Ming

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Monthly Weather Review EARLY ONLINE RELEASE  

E-Print Network [OSTI]

are used10 to estimate flow-dependent background error covariance. Two assimilation experiments11 have been conducted using precipitation-affected radiances from passive microwave12 sensors, one for a tropical storm the propagation of information in observed14 radiances via flow-dependent background error auto- and cross

Collett Jr., Jeffrey L.

362

Scattering of magnetosonic waves in a relativistic and anisotropic magnetized plasma  

Science Journals Connector (OSTI)

......underlines the excitation of the MHD waves by a gravitational wave...subsequent scattering of these MHD waves, we need a covariant relativistic...with magnetic field In the ideal MHD approximation, the magnetic...origin z=z 0 as in a Minkowski diagram. In the absence of the GW......

Joachim Moortgat; Jan Kuijpers

2006-05-21T23:59:59.000Z

363

Resource Optimization in a Wireless Sensor Network with Guaranteed Estimator  

E-Print Network [OSTI]

algorithm at the fusion center, and provide a closed-form expression for the steady-state error covariance energy consumption and guarantees a desired level of estimation quality at the fusion center. We further a single sensor may not be enough to provide a desired level of estimation quality, and data fusion from

Murray, Richard M.

364

Published in IET Control Theory and Applications Received on 28th February 2009  

E-Print Network [OSTI]

algorithm at the fusion centre, and provide a closed- form expression for the steady-state error covariance overall energy consumption and guarantees a desired level of estimation quality at the fusion centre a single sensor may not be enough to provide a desired level of estimation quality, and data fusion from

Johansson, Karl Henrik

365

EQUATION OF FORCE OF GRAVITY DERIVED FROM THE AREA OF PLANCK INVARIANCE UNUSED UNIVERSAL GRAVITATIONAL CONSTANT OF  

E-Print Network [OSTI]

with entropy the energy sector flow (2). Erik Verlinde published on January 6, 2010, his work "On the Origin, to make it compatible with the law of conservation of energy and principles of general covariance the energy- momentum tensor, but fails to integrate into said Energy-Momentum Tensor the constant Universal

366

Long-Term Carbon Dioxide Fluxes from a Very Tall Tower in a Northern Forest: Flux Measurement Methodology  

Science Journals Connector (OSTI)

Methodology for determining fluxes of CO2 and H2O vapor with the eddy-covariance method using data from instruments on a 447-m tower in the forest of northern Wisconsin is addressed. The primary goal of this study is the validation of the methods ...

Bradford W. Berger; Kenneth J. Davis; Chuixiang Yi; Peter S. Bakwin; Cong Long Zhao

2001-04-01T23:59:59.000Z

367

Quasi-local energy-momentum and energy flux at null infinity  

E-Print Network [OSTI]

The null infinity limit of the gravitational energy-momentum and energy flux determined by the covariant Hamiltonian quasi-local expressions is evaluated using the NP spin coefficients. The reference contribution is considered by three different embedding approaches. All of them give the expected Bondi energy and energy flux.

Xiaoning Wu; Chiang-Mei Chen; James M. Nester

2005-06-02T23:59:59.000Z

368

Sequential Monte Carlo EM for multivariate probit models  

Science Journals Connector (OSTI)

Multivariate probit models have the appealing feature of capturing some of the dependence structure between the components of multidimensional binary responses. The key for the dependence modelling is the covariance matrix of an underlying latent multivariate ... Keywords: Adaptive sequential Monte Carlo, Maximum likelihood, Monte Carlo EM, Multivariate probit

Giusi Moffa; Jack Kuipers

2014-04-01T23:59:59.000Z

369

A Dynamic Programming Algorithm for RNA Structure Prediction Including Pseudoknots  

E-Print Network [OSTI]

minimum energy structure for a single RNA sequence, using standard RNA folding thermodynamic parameters algorithm to be able to fold optimal (minimum energy) pseudoknotted RNAs with the accepted RNA thermodynamic, particularly pairs which covary to maintain Watson-Crick complementarity, are indicative of conserved base

Eddy, Sean

370

Ecological Applications, 14(4) Supplement, 2004, pp. S22S32 2004 by the Ecological Society of America  

E-Print Network [OSTI]

, University of California, Irvine, California 92697-3100 USA Abstract. We used the eddy covariance technique to the dry season, cooler temperatures, greater cloudiness, and reduced incoming solar and net radiation in evaporative fraction coincided with an increase in ecosystem CO2 assimilation capacity, which we attribute

Kimball, Sarah

371

Statistical Deterministic  

E-Print Network [OSTI]

of OL weights / H 1=2 ). H !1: Posterior of net output converges (with p. 1) to zero-mean Gaussian D) = P (D j #18;)P (#18;) P (D) (1) to calculate P (t j x; D) by marginalizing over #18;. Karlsruhe | November 10, 1998 5 #12; Regression with Gaussian Processes Prior P (y(x)) zero-mean GP with covariance

Seeger, Matthias

372

The role of translational invariance in non linear gauge theories of gravity  

E-Print Network [OSTI]

The internal structure of the tetrads in a Poincar\\'e non linear gauge theory of gravity is considered. Minkowskian coordinates becomes dynamical degrees of freedom playing the role of Goldstone bosons of the translations. A critical length allowing a covariant expansion similar to the weak field approach is deduced, the zeroth order metric being maximally symmetric (Minkowskian in some cases).

J. Martin; A. Tiemblo

2008-03-04T23:59:59.000Z

373

hal-00160871,version1-9Jul2007 Gaussian approximations of multiple integrals  

E-Print Network [OSTI]

l EUi (l)2 is bounded for every i, and also that the sequence of covariances cl (i, j) = EUi (l) Uj) to the law of a Gaussian vector N (l) = (N1 (l) , ..., Nk (l)) such that ENi (l) Nj (l) = EUi (l) Uj (l) = cl

374

Analyzing nonstationary spatial data using piecewise Gaussian Hyoung-Moon Kim, Bani K. Mallick and C. C. Holmes1  

E-Print Network [OSTI]

Analyzing nonstationary spatial data using piecewise Gaussian processes Hyoung-Moon Kim, Bani K propose a generic method for the analysis of spatial data with sharp changes in the underlying covariance Datta-Gupta for providing the data and Michael Sherman, Sang Heon Lee, Naijun Sha for helpful comments

Holmes, Chris

375

Motion Processing and From-from-Apparent-Motion in Infancy  

E-Print Network [OSTI]

/VPC) and discrimination paradigms. Infants in both paradigms extracted shape from apparent motion given luminance cues alone, and color and luminance cues co-varying; but failed to extract shape given color cues alone (Studies 1-2). Given only color cues, infants required...

Hirshkowitz, Amy

2014-08-05T23:59:59.000Z

376

Orthodontics diagnostic based on multinomial logistic regression model  

Science Journals Connector (OSTI)

The main objective of this study is evaluate the influence of several covariates in the occurrence of two types of vertical jaw dysplasia (open bite and deepbite) in orthodontics field. The study of vertical jaw dysplasia is of great interest to the ... Keywords: deepbite, hyoid bone (HB), logit, multinomial logistic regression, open bite, stepwise

Ana Cristina Braga; Vanda Urzal; A. Pinhão Ferreira

2013-06-01T23:59:59.000Z

377

Structural basis of histidine kinase autophosphorylation deduced by integrating genomics, molecular dynamics, and mutagenesis  

Science Journals Connector (OSTI)

...protein interaction by message passing . Proc Natl Acad...2004 ) Influence of conservation on calculations of amino acid covariance...proteinquakes, and the energy landscapes of functional transitions...biomolecular binding by energy landscape theory . Curr Opin...protein interaction by message passing . Proc Natl...Health, and US Public Health Service...

Angel E. Dago; Alexander Schug; Andrea Procaccini; James A. Hoch; Martin Weigt; Hendrik Szurmant

2012-01-01T23:59:59.000Z

378

QUIKSCAT MEASUREMENTS AND ECMWF WIND FORECASTS  

E-Print Network [OSTI]

. (2004) this forecast error was encountered when assimilating satellite measurements of zonal wind speeds between satellite measurements and meteorological forecasts of near-surface ocean winds. This type of covariance enters in assimilation techniques such as Kalman filtering. In all, six residual fields

Malmberg, Anders

379

QUIKSCAT MEASUREMENTS AND ECMWF WIND FORECASTS  

E-Print Network [OSTI]

. (2004) this forecast error was encountered when assimilating satellite measurements of zonal wind speeds between satellite measurements and meteorological forecasts of near­surface ocean winds. This type of covariance enters in assimilation techniques such as Kalman filtering. In all, six residual fields

Malmberg, Anders

380

Positive correlation between Li and Mg isotope ratios in the river waters of the Mackenzie Basin challenges the interpretation of apparent isotopic  

E-Print Network [OSTI]

geochemistry magnesium Mg isotopes lithium Li isotopes chemical weathering a b s t r a c t During chemical expressed as d26 Mg) show in excess of one per mil variability. Part of this variability is attributed covariation between lithium (7 Li/6 Li, expressed as d7 Li) and Mg isotope ratios in the river waters

Paytan, Adina

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

From principal component to direct coupling analysis of coevolution in proteins: Loweigenvalue modes are needed for  

E-Print Network [OSTI]

1 From principal component to direct coupling analysis of coevolution in proteins: Low the covariation of residues in mutliple-sequence alignments of homol- ogous proteins to extract functional by the statistical physics of disordered systems, we intro- duce the Hopfield-Potts model to naturally interpolate

Cocco, Simona

382

From principal component to direct coupling analysis of coevolution in proteins: Low-eigenvalue modes are needed for  

E-Print Network [OSTI]

1 From principal component to direct coupling analysis of coevolution in proteins: Low the covariation of residues in multiple-sequence alignments of homol- ogous proteins to extract functional by the statistical physics of disordered systems, we introduce the Hopfield-Potts model to naturally interpolate

383

Nitrogen Dynamics of Spring-fed Wetland Ecosystems of the Sierra Nevada Foothills  

E-Print Network [OSTI]

permissible level. While conservative, this level is deemed appropriate because drinking water is only one woodlands. Ammonium and nitrate pool sizes covaried inversely with nitrate dominance (about 3 µg N g dry perspective, excessive nitrate concentrations in drinking water (>20 ppm nitrate-N) can cause

Standiford, Richard B.

384

A unifying mechanical equation with applications to non-holonomic constraints and dissipative phenomena  

E-Print Network [OSTI]

A mechanical covariant equation is introduced which retains all the effectingness of the Lagrange equation while being able to describe in a unified way other phenomena including friction, non-holonomic constraints and energy radiation (Lorentz-Abraham-Dirac force equation). A quantization rule adapted to the dissipative degrees of freedom is proposed which does not pass through the variational formulation.

E. Minguzzi

2014-10-01T23:59:59.000Z

385

EXTREME VALUE ANALYSIS FOR CLIMATE TIME SERIES Institute for Mathematics Applied to Geosciences  

E-Print Network [OSTI]

Approach (Extremes + Non-Extremes) (8) Risk Communication under Climate Change #12;4 (1) Background · Use.isse.ucar.edu/staff/katz/ Lecture: ···/staff/katz/docs/pdf/banffrwk.pdf #12;2 Quote "Climate change undermines a basic assumption Cycles (annual, diurnal) Trends (global climate change) Physically-based covariates (e. g., El Niño

Katz, Richard

386

Dietary Insulin Index and Insulin Load in Relation to Endometrial Cancer Risk in the Nurses' Health Study  

Science Journals Connector (OSTI)

...II) and insulin load (IL) scores developed...blinded to questionnaire data reviewed the documents...limited statistical power, dietary IL strongly...most other covariate data (except height and...Glycemic index, glycemic load and endometrial cancer...Service, USDA Nutrient Data Laboratory. 2000...

Jennifer Prescott; Ying Bao; Akila N. Viswanathan; Edward L. Giovannucci; Susan E. Hankinson; and Immaculata De Vivo

2014-08-01T23:59:59.000Z

387

Sarang Joshi 10/10/2001 #1 Statistics of Shape:Statistics of Shape: EigenEigen ShapesShapes  

E-Print Network [OSTI]

HippocampalHippocampal MappingMapping Atlas Patients #12;Sarang Joshi 2/16/2003 #5 HippocampalHippocampal MappingMapping Atlas Subjects #12;' & $ %Sarang Joshi May 3, 2000 16 Shape of 2-D Sub Mg be a Gaussian random vector eld with mean mU 2 H and covariance KU of nite trace. There exists

North Carolina at Chapel Hill, University of

388

Ecology, 90(3), 2009, pp. 742753 2009 by the Ecological Society of America  

E-Print Network [OSTI]

relationships we detected between Cassin's Auklet breeding success and ocean climate conditions across widely determine the extent to which ocean climate conditions and Cassin's Auklet timing of breeding and breeding success covary across populations in British Columbia, central California, and northern Mexico over six

389

The unreplicated ultrastructural relation: Large sample properties  

Science Journals Connector (OSTI)

......1977) for the linear functional relation. THEOREM 2. The asymptotic covariance matrix of fL = (fi^,..., jln) is where Inis thenxn identity matrix, ln is a column vector of n units and W is the nxn matrix with elements Wi} = (n{ -- (i) (JJ......

W. M. PATEFIELD

1978-12-01T23:59:59.000Z

390

Efficient navigation of parameter landscapes  

Science Journals Connector (OSTI)

The covariance matrix of the gradient of the cost function contains a great deal of information about a parameter space. The eigenvectors of the covariance matrix form an optimal basis (in the sense of data compression) for the gradient. Since search algorithms base their decisions on the gradient (often in an indirect fashion) the eigenvectors in some sense form an optimal set of generators for navigating parameter landscapes. For problems involving a long valley there is usually an eigenvector oriented parallel to the valley. Search algorithms based on the optimal generators may find the deepest point in the valley several times faster than algorithms based on other generators. The covariance matrix also contains information about the key underlying parameters. The most important parameters correspond to the eigenvectors associated with the largest eigenvalues. This information can be exploited to reparametrize with a smaller number of parameters. The covariance matrix is the integral of the outer product of the gradient over the parameter space. Obtaining a good estimate of this integral with the Monte Carlo method usually requires relatively little effort even for high?dimensional parameter spaces. Examples are presented for geoacoustic inverse problems involving acoustic sources and receivers located in the ocean.

Michael D. Collins

1994-01-01T23:59:59.000Z

391

Slide 1 of 37 www.chrisbilder.com  

E-Print Network [OSTI]

Slide 1 of 37 www.chrisbilder.com Outline BSG Basics Estimation Identification Covariates NIH grant of Statistics University of Nebraska-Lincoln www.chrisbilder.com chris@chrisbilder.com Slide 2 of 37 wwwGalacticaGalactica BSG · Statistics and Battlestar Galactica · The story so far... ­ Video Slide 3 of 37 www

Bilder, Christopher R.

392

Algebras without Involution and Quantum Field Theories  

E-Print Network [OSTI]

Explicit realizations of quantum field theory (QFT) are admitted by a revision to the Wightman axioms for the vacuum expectation values (VEV) of fields. The technical development of QFT is expanded beyond positive functionals on *-algebras while the physically motivated properties: Poincare covariance; positive energy; microcausality; and a Hilbert space realization of states, are preserved.

Glenn Eric Johnson

2014-10-01T23:59:59.000Z

393

Acta Phys. Hung. B 20/1 (2004) 000000 ELECTRONICS  

E-Print Network [OSTI]

phase-covariant quantum multimeter. Both devices utilize polarization states of photon pairs generated- sibility to program the apparatus by the quantum states of another qubit system called program register cryptography [18]. In this paper we focus our attention to the unambiguous state discrimination. Let us suppose

Dusek, Miloslav

394

Comparing Simulated and Measured Sensible and Latent Heat Fluxes over Snow under a Pine Canopy to Improve an Energy Balance Snowmelt Model  

Science Journals Connector (OSTI)

During the second year of the NASA Cold Land Processes Experiment (CLPX), an eddy covariance (EC) system was deployed at the Local Scale Observation Site (LSOS) from mid-February to June 2003. The EC system was located beneath a uniform pine ...

D. Marks; A. Winstral; G. Flerchinger; M. Reba; J. Pomeroy; T. Link; K. Elder

2008-12-01T23:59:59.000Z

395

Post-Newtonian cosmological dynamics in Lagrangian coordinates  

Science Journals Connector (OSTI)

......T.b' with R.b the Ricci tensor, and the continuity equation r;~ =0 for the matter stress-energy tensor yab =(!C2U U b, where (! is the mass density and u the fluid four-velocity (normalized to u u. = -1); a semicolon denotes covariant......

Sabino Matarrese; David Terranova

1996-11-01T23:59:59.000Z

396

The Riemannian Potato: an automatic and adaptive artifact detection method for online experiments  

E-Print Network [OSTI]

The Riemannian Potato: an automatic and adaptive artifact detection method for online experiments manifold. Since the Riemannian metric is non-linear, this region of interest corresponds to a "potato" in the Riemannian manifold. Fig. 1 shows the potato for a dataset of 100 2x2 covariance matrices on simulated data

Paris-Sud XI, Université de

397

Economical quantum cloning in any dimension  

E-Print Network [OSTI]

The possibility of cloning a d-dimensional quantum system without an ancilla is explored, extending on the economical phase-covariant cloning machine found in [Phys. Rev. A {\\bf 60}, 2764 (1999)] for qubits. We prove the impossibility of constructing an economical version of the optimal universal cloning machine in any dimension. We also show, using an ansatz on the generic form of cloning machines, that the d-dimensional phase-covariant cloner, which optimally clones all uniform superpositions, can be realized economically only in dimension d=2. The used ansatz is supported by numerical evidence up to d=7. An economical phase-covariant cloner can nevertheless be constructed for d>2, albeit with a lower fidelity than that of the optimal cloner requiring an ancilla. Finally, using again an ansatz on cloning machines, we show that an economical version of the Fourier-covariant cloner, which optimally clones the computational basis and its Fourier transform, is also possible only in dimension d=2.

Thomas Durt; Jaromir Fiurasek; Nicolas J. Cerf

2004-12-26T23:59:59.000Z

398

AIDS RESEARCH AND HUMAN RETROVIRUSES Volume 21, Number 12, 2005, pp. 10161030  

E-Print Network [OSTI]

, and five CTL epitope-rich regions in Gag, Nef, and Tat. The corresponding regions in HIV-1 subtype B were, Inc. Covariability of Selected Amino Acid Positions for HIV Type 1 Subtypes C and B PETER B. GILBERT,1 in globally dominant HIV-1 subtype C viruses. The analyzed sequences spanned the V3 loop, Gag p17, Gag p24

Gilbert, Peter

399

Baryon Fluctuations in High Energy Nuclear Collisions  

E-Print Network [OSTI]

We propose that dramatic changes in the variances and covariance of protons and antiprotons can result if baryons approach chemical equilibrium in nuclear collisions at RHIC. To explore how equilibration alters these fluctuations, we formulate both equilibrium and nonequilibrium hadrochemical descriptions of baryon evolution. Contributions to fluctuations from impact parameter averaging and finite acceptance in nuclear collisions are numerically simulated.

Sean Gavin; Claude Pruneau

1999-07-09T23:59:59.000Z

400

This article was published in an Elsevier journal. The attached copy is furnished to the author for non-commercial research and  

E-Print Network [OSTI]

reduce human dietary exposure to Hg in the region. An improved method of analysis of covariance bioaccu- mulative pollutants are elevated in sport fish tissue (Fairey et al., 1997; Davis et al., 2002 exposure to methylmercury, PCBs, organochlor- ine pesticides, and dioxins (OEHHA, 1997). The Sacramento

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Sensitivity Study of a Semi-automatic Supervised Classifier Applied to Minerals from X-Ray Mapping Images  

E-Print Network [OSTI]

Lyngby, Denmark aa@imm.dtu.dk Harald Flesche Norsk Hydro Research Centre N-5020 Bergen, Norway Harald.Flesche@nho.hydro to a small area in order to allow for the estimation of a variance-covariance matrix. This expansion is presently used as a routine petrographi- cal analysis method at Norsk Hydro Research Cen- tre. 1

402

Conserved charges in 3D gravity  

SciTech Connect (OSTI)

The covariant canonical expression for the conserved charges, proposed by Nester, is tested on several solutions in three-dimensional gravity with or without torsion and topologically massive gravity. In each of these cases, the calculated values of energy momentum and angular momentum are found to satisfy the first law of black hole thermodynamics.

Blagojevic, M.; Cvetkovic, B. [University of Belgrade, Institute of Physics, P. O. Box 57, 11001 Belgrade (Serbia)

2010-06-15T23:59:59.000Z

403

Observed and modeled relationships among Arctic climate variables Yonghua Chen, James R. Miller, and Jennifer A. Francis  

E-Print Network [OSTI]

in our understanding of these processes. In addition to the traditional approach of validating individual variables with observed fields, we demonstrate that a comparison of covariances among interrelated and Atmospheric Dynamics: Polar meteorology; 3359 Meteorology and Atmospheric Dynamics: Radiative processes; 9315

Aires, Filipe

404

Supporting Online Material for: Carbon in Amazon forests: Unexpected seasonal fluxes and disturbance-  

E-Print Network [OSTI]

forest, and the effects of selective logging and land-use change. Three eddy covariance towers operate the Santarém-Cuiabá highway (1), plus the Km 67 and Km 83 tower sites, which constitute a control seasonal variations in important climatic variables at this site: solar radiation, net radiation, air

405

From: John Fowler Subject: Re: Interesting Discovery About Chi-Squares  

E-Print Network [OSTI]

this doesn't show up in the covariance matrix. Of course if a Gaussian generator is used for both independent draws; therefore it takes the first Central-Limit step toward being Gaussian, assuming that the generators were not for Gaussian random variables. I have run this algorithm with uniform random variables

Masci, Frank

406

Cyber-ShARE Environmental Science An end-to-end cyberinfrastructure for  

E-Print Network [OSTI]

Covariance Air flow in an ecosystem (Based on Burba et al, 2010) CO2 Energy WaterVapor Humidity Temperature in Arctic and Chihuahuan Desert ecosystems over multiple spatial and temporal scales? Can new CI improve the acquisition, processing, quality, trust and usefulness of environmental science data? Meeting critical gaps

Ward, Karen

407

Long-term surface carbon dioxide flux monitoring at the Ketzin carbon dioxide storage test site  

Science Journals Connector (OSTI)

...measured in a northern Japan larch plantation using eddy covariance techniques...explained by variations in biomass and soil chemical and physical...fluxes from a boreal mixed wood forest ecosystem in Ontario...variations in a young ponderosa pine plantation in northern California: Global...

Martin Zimmer; Peter Pilz; Jörg Erzinger

408

A two-fluid model for relativistic heat conduction  

SciTech Connect (OSTI)

Three years ago it was presented in these proceedings the relativistic dynamics of a multi-fluid system together with various applications to a set of topical problems [1]. In this talk, I will start from such dynamics and present a covariant formulation of relativistic thermodynamics which provides us with a causal constitutive equation for the propagation of heat in a relativistic setting.

López-Monsalvo, César S. [Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México (Mexico)

2014-01-14T23:59:59.000Z

409

Inter-genomic sexual conflict drives antagonistic coevolution in harvester ants  

Science Journals Connector (OSTI)

...in such systems can drive sexually antagonistic...benefit from higher mating frequency and diversity. In this...t-test. All other variables were analysed using...final model for each variable. Covariates included...expected from adult colony frequencies, both males and queens...

2014-01-01T23:59:59.000Z

410

Simplifying the Analysis of C++ Programs  

E-Print Network [OSTI]

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.2 Internal Approaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.3 External Approaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 3.4 Multiple Dispatch... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 4.3.4 Covariant Return Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 4.3.5 Algorithm for Dispatch Table Generation . . . . . . . . . . . . . . . . . . . . . . . . . 56 4.3.6 Alternative Dispatch Semantics...

Solodkyy, Yuriy

2013-08-14T23:59:59.000Z

411

Boundary-Layer Meteorol (2008) 127:273292 DOI 10.1007/s10546-007-9254-x  

E-Print Network [OSTI]

of the Reynolds or temporally averaged heat flux at a grid point from the horizontally averaged total heat flux experiments that the eddy covariance heat fluxes are systematically underestimated as compared magnitude and its horizontal and vertical distributions. The flux imbalance of heat and the bottom­up tracer

Lee, Xuhui

412

Biodiversity as spatial insurance: the effects of habitat fragmentation and  

E-Print Network [OSTI]

habitat destruction (e.g. strip min- ing or clear cutting of forests), conversion to agri- culture (e.g. conversion of grasslands to croplands or rangelands, or conversion of forests to planta- tions that these effects may be weaker or masked by other covarying factors in the environ- ment (Grace et al. 2007, Hector

Gonzalez, Andrew

413

Evaluated Nuclear (reaction) Data from the Evaluated Nuclear Data File (ENDF)  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The current version is ENDF/B VII.0, released in 2006. Users can search ENDF via specialized interfaces, browse sub-libraries or download them as zipped files. Data plots can be generated through the Sigma interface. The ENDF web page also provides access to covariance data processing and plots. (Specialized Interface)

414

The Interaction Between Multi-Overlaps in the High Temperature Phase of the Sherrington-Kirkpatrick Spin Glass  

E-Print Network [OSTI]

We explore the joint behavior of a finite number of multi-overlaps in the high temperature phase of the SK model. Extending work by M. Talagrand, we show that, when these objects are scaled to have non-trivial limiting distributions, the joint behavior is described by a Gaussian process with an explicit covariance structure.

Nicholas Crawford

2007-11-26T23:59:59.000Z

415

Carotenoids and egg quality in the lesser black-backed gull Larus fuscus: a supplemental feeding study of maternal effects  

Science Journals Connector (OSTI)

...factor and female coloration index as a covariate. Models were...sequence female coloration index -- -- -- 11.65 2,13...14 0.007 female coloration index 0.03 1,13 0.864 0.27...ment pigmentation on clutch completion, consistent with the explanation...

2002-01-01T23:59:59.000Z

416

Intestinal Dysbiosis Associated with Systemic Lupus Erythematosus  

Science Journals Connector (OSTI)

...amounts were recorded in household units, by volume, or...intake was analyzed for energy and macro- and micronutrient...Pharmaceutical Co., Tokyo, Japan), Faecalibacterium...linear model, including energy intake and BMI as covariates...increased capacity for energy harvest. Nature 444...

Arancha Hevia; Christian Milani; Patricia López; Adriana Cuervo; Silvia Arboleya; Sabrina Duranti; Francesca Turroni; Sonia González; Ana Suárez; Miguel Gueimonde; Marco Ventura; Borja Sánchez; Abelardo Margolles

2014-10-01T23:59:59.000Z

417

Carbon Dioxide Emissions of the City Center of Firenze, Italy: Measurement, Evaluation, and Source Partitioning  

Science Journals Connector (OSTI)

An eddy covariance station was installed in the city center of Firenze, Italy, to measure carbon fluxes at half-hourly intervals over a mostly homogeneous urban area. Carbon dioxide (CO2) emission observations made over an initial period of 3.5 ...

A. Matese; B. Gioli; F. P. Vaccari; A. Zaldei; F. Miglietta

2009-09-01T23:59:59.000Z

418

Nitrous oxide emissions from soils: how well do we understand the processes and their controls?  

Science Journals Connector (OSTI)

...1365-2486.2010.02351.x ) 56 Birch, HF , Friend, MT. 1956 Humus decomposition...covariance measurements using quantum cascade laser spectrometery over a Swiss forest. Biogeosciences...review of applications of model-data fusion to studies of terrestrial carbon fluxes...

2013-01-01T23:59:59.000Z

419

DOI:01.IJCOM.02.03. ACEEE Int. J. on Communication, Vol. 02, No. 03, Nov2011  

E-Print Network [OSTI]

, Saudi Arabia ntayem@pmu.edu.sa Abstract ­ In this paper, a new algorithm for a high resolution Direction in two steps. In the first step, the received signals data is decomposed in a Toeplitz form using) for the covariance matrix or singular value decomposition (SVD) for the data matrix; using EVD or SVD requires much

Paris-Sud XI, Université de

420

4, 11371165, 2007 Suitability QCL for  

E-Print Network [OSTI]

BGD 4, 1137­1165, 2007 Suitability QCL for eddy covariance P. S. Kroon et al. Title Page Abstract Centre of the Netherlands (ECN), Department of Air Quality and Climate Change, Netherlands 2 TU Delft, Department of Multi-Scale Physics, Research group Clouds, Climate and Air Quality, Netherlands 3 Aerodyne

Boyer, Edmond

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Model Validation and Spatial Interpolation by Combining Observations with Outputs from Numerical  

E-Print Network [OSTI]

""r,c,rn The authors are for hel]JfuI #12;Abstract Constructing maps of pollution levels is vital for air quality concentrations. Key tlJords: air pollution, Ba~yesian inference, change of support, likelihood approaches, Matern Resolutions 2.5 Modeling a Nonstationary Covariance . 3 Estimation 3.1 Algorithm 4 Application: Air Pollution

Washington at Seattle, University of

422

1 Ozone pollution forecasting 3 Herve Cardot, Christophe Crambes and Pascal Sarda.  

E-Print Network [OSTI]

Contents 1 Ozone pollution forecasting 3 Herv´e Cardot, Christophe Crambes and Pascal Sarda. 1;1 Ozone pollution forecasting using conditional mean and conditional quantiles with functional covariates Herv´e Cardot, Christophe Crambes and Pascal Sarda. 1.1 Introduction Prediction of Ozone pollution

Crambes, Christophe

423

Atmospheric Environment 38 (2004) 44274436 Statistical comparison of observed and CMAQ modeled daily  

E-Print Network [OSTI]

2004 Abstract New statistical procedures to evaluate the Models-3/Community Multiscale Air Quality reserved. Keywords: Air quality model; Model evaluation; Space­time process; Separable covariance function 1. Introduction The Models-3/Community Multiscale Air Quality (CMAQ) modeling system has been

Jun, Mikyoung

424

Curriculum Vitae of Prathap Ramamurthy Name: Prathap Ramamurthy  

E-Print Network [OSTI]

-gas Emission Study), Employed eddy covariance technique to quantify CO2 and H2O fluxes in Salt Lake valley transported. SCERP (Nogales, Mexico): Participated in the experiment devised to reduce road dust using wind (Summer 2004 & 2005). Worked to understand turbulence transport in an idealized boundary layer. Graduate

Bou-Zeid, Elie

425

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

E-Print Network [OSTI]

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

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

2014-07-24T23:59:59.000Z

426

Motion planning with sequential convex optimization and convex collision checking  

Science Journals Connector (OSTI)

We present a new optimization-based approach for robotic motion planning among obstacles. Like CHOMP (Covariant Hamiltonian Optimization for Motion Planning), our algorithm can be used to find collision-free trajectories from naïve, straight-line initializations ... Keywords: Motion planning, convex collision checking, sequential convex optimization, trajectory optimization

John Schulman, Yan Duan, Jonathan Ho, Alex Lee, Ibrahim Awwal, Henry Bradlow, Jia Pan, Sachin Patil, Ken Goldberg, Pieter Abbeel

2014-08-01T23:59:59.000Z

427

Malagasy dialects and the peopling of Madagascar  

Science Journals Connector (OSTI)

...role for the SCA as the covariance matrix does for the usual PCA analysis. The standard...the world's languages: a comparative handbook (eds M. Haspelmath and U. Tadmor...the Barito river in Kalimantan and which does not possess the necessary skill for long...

2012-01-01T23:59:59.000Z

428

The Need for Meta-Analytic Thinking in Educational Technology Research  

E-Print Network [OSTI]

with accompanying means and standard deviations or covariance matrices. In the second study, the author conducted a meta-analysis to offer a glimpse of where the field could go once researchers begin to think meta-analytically. The author cumulated findings from...

Ritter, Nicola L.

2014-05-19T23:59:59.000Z

429

Extreme phase and rotated quadrature measurements  

E-Print Network [OSTI]

We determine the extreme points of the convex set of covariant phase observables. Such extremals describe the best phase parameter measurements of laser light - the best in the sense that they are free from classical randomness due to fluctuations in the measuring procedure. We also characterize extreme fuzzy rotated quadratures.

Juha-Pekka Pellonpää

2009-11-03T23:59:59.000Z

430

A Sparse Bayesian Model for Dependence Analysis of Extremes: Climate Applications  

E-Print Network [OSTI]

A Sparse Bayesian Model for Dependence Analysis of Extremes: Climate Applications Debasish Das applications, such as climate, finance and social media among others, we are often interested in extreme events. An important part of modeling extremes is dis- covery of covariates on which the quantities related

Obradovic, Zoran

431

A CSP Field Theory with Helicity Correspondence  

E-Print Network [OSTI]

We propose the first covariant local action describing the propagation of a single free continuous-spin degree of freedom. The theory is simply formulated as a gauge theory in a "vector superspace", but can also be formulated in terms of a tower of symmetric tensor gauge fields. When the spin invariant $\\rho$ vanishes, the helicity correspondence is manifest -- familiar gauge theory actions are recovered and couplings to conserved currents can easily be introduced. For non-zero $\\rho$, a tower of tensor currents must be present, of which only the lowest rank is exactly conserved. A paucity of local gauge-invariant operators for non-zero $\\rho$ suggests that the equations of motion in any interacting theory should be covariant, not invariant, under a generalization of the free theory's gauge symmetry.

Schuster, Philip

2014-01-01T23:59:59.000Z

432

Wilson Loops and Area-Preserving Diffeomorphisms in Twisted Noncommutative Gauge Theory  

E-Print Network [OSTI]

We use twist deformation techniques to analyse the behaviour under area-preserving diffeomorphisms of quantum averages of Wilson loops in Yang-Mills theory on the noncommutative plane. We find that while the classical gauge theory is manifestly twist covariant, the holonomy operators break the quantum implementation of the twisted symmetry in the usual formal definition of the twisted quantum field theory. These results are deduced by analysing general criteria which guarantee twist invariance of noncommutative quantum field theories. From this a number of general results are also obtained, such as the twisted symplectic invariance of noncommutative scalar quantum field theories with polynomial interactions and the existence of a large class of holonomy operators with both twisted gauge covariance and twisted symplectic invariance.

Mauro Riccardi; Richard J. Szabo

2007-01-30T23:59:59.000Z

433

Electric/magnetic duality for chiral gauge theories with anomaly cancellation  

E-Print Network [OSTI]

We show that 4D gauge theories with Green-Schwarz anomaly cancellation and possible generalized Chern-Simons terms admit a formulation that is manifestly covariant with respect to electric/magnetic duality transformations. This generalizes previous work on the symplectically covariant formulation of anomaly-free gauge theories as they typically occur in extended supergravity, and now also includes general theories with (pseudo-)anomalous gauge interactions as they may occur in global or local N=1 supersymmetry. This generalization is achieved by relaxing the linear constraint on the embedding tensor so as to allow for a symmetric 3-tensor related to electric and/or magnetic quantum anomalies in these theories. Apart from electric and magnetic gauge fields, the resulting Lagrangians also feature two-form fields and can accommodate various unusual duality frames as they often appear, e.g., in string compactifications with background fluxes.

Jan De Rydt; Torsten T. Schmidt; Mario Trigiante; Antoine Van Proeyen; Marco Zagermann

2009-02-07T23:59:59.000Z

434

Wilson loops and area-preserving diffeomorphisms in twisted noncommutative gauge theory  

SciTech Connect (OSTI)

We use twist deformation techniques to analyze the behavior under area-preserving diffeomorphisms of quantum averages of Wilson loops in Yang-Mills theory on the noncommutative plane. We find that while the classical gauge theory is manifestly twist covariant, the holonomy operators break the quantum implementation of the twisted symmetry in the usual formal definition of the twisted quantum field theory. These results are deduced by analyzing general criteria which guarantee twist invariance of noncommutative quantum field theories. From this a number of general results are also obtained, such as the twisted symplectic invariance of noncommutative scalar quantum field theories with polynomial interactions and the existence of a large class of holonomy operators with both twisted gauge covariance and twisted symplectic invariance.

Riccardi, Mauro; Szabo, Richard J. [Department of Mathematics and Maxwell Institute for Mathematical Sciences, Heriot-Watt University, Colin Maclaurin Building, Riccarton, Edinburgh EH14 4AS (United Kingdom)

2007-06-15T23:59:59.000Z

435

Application of Mutual Information Methods in Time-Distance Helioseismology  

E-Print Network [OSTI]

We apply a new technique, the mutual information (MI) from information theory, to time-distance helioseismology, and demonstrate that it can successfully reproduce several classic results based on the widely used cross-covariance method. MI quantifies the deviation of two random variables from complete independence, and represents a more general method for detecting dependencies in time series than the cross-covariance function, which only detects linear relationships. We provide a brief description of the MI-based technique and discuss the results of the application of MI to derive the solar differential profile, a travel-time deviation map for a sunspot and a time-distance diagram from quiet Sun measurements.

Keys, Dustin; Pevtsov, Alexei

2015-01-01T23:59:59.000Z

436

User Guide for the STAYSL PNNL Suite of Software Tools  

SciTech Connect (OSTI)

The STAYSL PNNL software suite provides a set of tools for working with neutron activation rates measured in a nuclear fission reactor, an accelerator-based neutron source, or any neutron field to determine the neutron flux spectrum through a generalized least-squares approach. This process is referred to as neutron spectral adjustment since the preferred approach is to use measured data to adjust neutron spectra provided by neutron physics calculations. The input data consist of the reaction rates based on measured activities, an initial estimate of the neutron flux spectrum, neutron activation cross sections and their associated uncertainties (covariances), and relevant correction factors. The output consists of the adjusted neutron flux spectrum and associated covariance matrix, which is useful for neutron dosimetry and radiation damage calculations.

Greenwood, Lawrence R.; Johnson, Christian D.

2013-02-27T23:59:59.000Z

437

Effective Hamiltonians for generalized Breit interactions in QCD  

Science Journals Connector (OSTI)

Effective Hamiltonians for two-body interactions consistent with Lorentz covariance to order v2/c2 are obtained by reducing the instantaneous Bethe-Salpeter equation and the two-body Dirac equation to Schrödinger-Pauli form by the large-component method of reduction. Previous calculations of effective Hamiltonians for scalar exchange are shown to be incomplete. They omit generalized Breit interactions which are required for a general description of scalar exchange in both classical and quantum field theory. The effective Hamiltonians are obtained for arbitrary potential functions to facilitate their use in QCD calculations. The ambiguity that is present in the more common type of derivation based on a covariant decomposition of the Bethe-Salpeter kernel in momentum space is avoided in this approach.

R. W. Childers

1987-07-15T23:59:59.000Z

438

Gravity with a dynamical preferred frame  

Science Journals Connector (OSTI)

We study a generally covariant model in which local Lorentz invariance is broken by a dynamical unit timelike vector field ua—the “aether.” Such a model makes it possible to study the gravitational and cosmological consequences of preferred frame effects, such as “variable speed of light” or high frequency dispersion, while preserving a generally covariant metric theory of gravity. In this paper we restrict attention to an action for an effective theory of the aether which involves only the antisymmetrized derivative ?[aub]. Without matter this theory is equivalent to a sector of the Einstein-Maxwell-charged dust system. The aether has two massless transverse excitations, and the solutions of the model include all vacuum solutions of general relativity (as well as other solutions). However, the aether generally develops gradient singularities which signal a breakdown of this effective theory. Including the symmetrized derivative in the action for the aether field may cure this problem.

Ted Jacobson and David Mattingly

2001-06-26T23:59:59.000Z

439

Black Holes with Weyl Charge and Non-Riemannian Waves  

E-Print Network [OSTI]

A simple modification to Einstein's theory of gravity in terms of a non-Riemannian connection is examined. A new tensor-variational approach yields field equations that possess a covariance similar to the gauge covariance of electromagnetism. These equations are shown to possess solutions analogous to those found in the Einstein-Maxwell system. In particular one finds gravi-electric and gravi-magnetic charges contributing to a spherically symmetric static Reissner-Nordstr\\"om metric. Such Weyl ``charges'' provide a source for the non-Riemannian torsion and metric gradient fields instead of the electromagnetic field. The theory suggests that matter may be endowed with gravitational charges that couple to gravity in a manner analogous to electromagnetic couplings in an electromagnetic field. The nature of gravitational coupling to spinor matter in this theory is also investigated and a solution exhibiting a plane-symmetric gravitational metric wave coupled via non-Riemannian waves to a propagating spinor field is presented.

Robin W Tucker; Charles Wang

1995-09-06T23:59:59.000Z

440

A CSP Field Theory with Helicity Correspondence  

E-Print Network [OSTI]

We propose the first covariant local action describing the propagation of a single free continuous-spin degree of freedom. The theory is simply formulated as a gauge theory in a "vector superspace", but can also be formulated in terms of a tower of symmetric tensor gauge fields. When the spin invariant $\\rho$ vanishes, the helicity correspondence is manifest -- familiar gauge theory actions are recovered and couplings to conserved currents can easily be introduced. For non-zero $\\rho$, a tower of tensor currents must be present, of which only the lowest rank is exactly conserved. A paucity of local gauge-invariant operators for non-zero $\\rho$ suggests that the equations of motion in any interacting theory should be covariant, not invariant, under a generalization of the free theory's gauge symmetry.

Philip Schuster; Natalia Toro

2014-04-02T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

A Kalman filtering technique for spacecraft attitude determination and control using Gibbs vector  

E-Print Network [OSTI]

of the state vector these equations can be represented mathematically by x(t) = f(x(t), t) + g(x(t), t)w(t) (62) where x(t) is the state vector, and w(t) is the system process noise vector assumed to be Gaussian white noise with mean and covariance given... and covariance of the system state vector are given by E(x(t )} =- x(t ) = x (64a) E[ (x(to) ? x )(x(t ) ? xo) ] - =[P(to)] = [P ] (64b) where x(t ) is the actual state vector initially, x(t ) is the expected value of the initial state vector, and [P ] is 0...

Tallant, Gregory Stephen

1988-01-01T23:59:59.000Z

442

Applying Geospatial Semantic Array Programming for a Reproducible Set of Bioclimatic Indices in Europe  

E-Print Network [OSTI]

Bioclimate-driven regression analysis is a widely used approach for modelling ecological niches and zonation. Although the bioclimatic complexity of the European continent is high, a particular combination of 12 climatic and topographic covariates was recently found able to reliably reproduce the ecological zoning of the Food and Agriculture Organization of the United Nations (FAO) for forest resources assessment at pan-European scale, generating the first fuzzy similarity map of FAO ecozones in Europe. The reproducible procedure followed to derive this collection of bioclimatic indices is now presented. It required an integration of data-transformation modules (D-TM) using geospatial tools such as Geographic Information System (GIS) software, and array-based mathematical implementation such as semantic array programming (SemAP). Base variables, intermediate and final covariates are described and semantically defined by providing the workflow of D-TMs and the mathematical formulation following the SemAP notat...

Caudullo, Giovanni

2014-01-01T23:59:59.000Z

443

Absence of Right-Handed Neutrino in Weak Interactions: Explanation via Nonlinear Electroweak Model  

E-Print Network [OSTI]

The nonlinear SU(2) electroweak model is used to explain the absence of the right-handed neutrino in weak interactions. Two covariant eigenvalue constraints which affect the transformation lead to two classes of right-handed leptons, and make possible invariant mass terms without the Higgs doublet. A covariant picture of neutrinos with mass is presented. A new invariant form for the boson potentials is described in which the boson mass terms arises via the adjoint field. This model also indicates a different region of matter involving coupled leptons that are "blind" to the massless electromagnetic field but "see" four massive potentials that are themselves blind to the electromagnetic field. We argue that these more difficult to detect "dark" fields provide a possible contribution to the missing mass.

Bill Dalton

2010-06-21T23:59:59.000Z

444

Development of a weighted-average estimator from a maximum-likelihood estimator and an instrumental-variable estimator in a structural model  

E-Print Network [OSTI]

? 62 S2, (3, 3) where 12??(2) P1M L2S?? 2P1M L2Se? + See S, = 211xx ? 6?S??. Similarly, to estimate the variance of MLl, (2o?'?), ) + ~S . ~) c? g??(, ) (P1ML1) 62 S2 + S 6 ( I) (3. 9) where aeu(1) PCCCL1Suu cue Cr. ?(, ) ? P, Mz, Suu ? 2P, M z... cree(cv) ? Pllv Suu 2P1IV Seu + See The asymptotic covariance of the ML and IV estimators is ACov((b?(a?? 1)) ~ Pccccl, e (b?(a?? 1)) ~ P, rv ) = ? "", (3. 13) Ouu (where ACov is the covariance of the limiting distributions), which is also equal...

Gruben, David Christopher

2012-06-07T23:59:59.000Z

445

Deep-inelastic scattering from the pion and the choice of phenomenological wave functions  

Science Journals Connector (OSTI)

We review the relation between covariant calculations and light-front calculations of pion properties. We describe the results obtained for the pion structure function in both formalisms. Conventional (phenomenological) light-front wave functions yield poor results for the structure function unless these results are evolved to higher energies. Our covariant calculation of the structure function has its basis in the Bethe-Salpeter approach to the solution of the two-body problem. Our study shows how an alternative specification of the light-front wave function of the pion leads to a good fit to the (valence) structure function, while also providing good fits for the pion-decay constant, f?, and the pion electromagnetic form factor (for Q2<0.2 GeV2). We also review the standard scheme for evolving distributions from a scale Q02 to a scale Q2 and contrast such procedures with our methods.

C. M. Shakin and Wei-Dong Sun

1995-04-01T23:59:59.000Z

446

Electromagnetic Properties for Arbitrary Spin Particles: Part 1 $-$ Electromagnetic Current and Multipole Decomposition  

E-Print Network [OSTI]

In a set of two papers, we propose to study an old-standing problem, namely the electromagnetic interaction for particles of arbitrary spin. Based on the assumption that light-cone helicity at tree level and $Q^2=0$ should be conserved non-trivially by the electromagnetic interaction, we are able to derive \\emph{all} the natural electromagnetic moments for a pointlike particle of \\emph{any} spin. In this first paper, we propose a transparent decomposition of the electromagnetic current in terms of covariant vertex functions. We also define in a general way the electromagnetic multipole form factors, and show their relation with the electromagnetic moments. Finally, by considering the Breit frame, we relate the covariant vertex functions to multipole form factors.

Cédric Lorcé

2009-01-27T23:59:59.000Z

447

Decomposing race and gender differences in underweight and obesity in South Africa  

Science Journals Connector (OSTI)

Abstract Using data from the National Income Dynamics Study, we document differentials in both underweight and obesity across race and gender in post-Apartheid South Africa. Using a nonlinear decomposition method, we decompose these differences across gender within race and then across race within gender. Less than one third of the differences in obesity and underweight across gender are explained by differences in covariates. In contrast, at least 70% of the obesity differences across race are explained by differences in covariates. Behavioral variables such as smoking and exercise explain the largest part of the bodyweight differentials across gender. For bodyweight differentials across race within gender, however, socioeconomic status and background variables have the largest explanatory power for obesity differentials, while background variables play the key role in explaining the underweight differentials. These results indicate that eradicating obesity and underweight differentials will require targeting policies to specific groups.

Susan L. Averett; Nicholas Stacey; Yang Wang

2014-01-01T23:59:59.000Z

448

Dispersion relation and Landau damping of waves in high-energy density plasmas  

Science Journals Connector (OSTI)

We present a theoretical investigation on the propagation of electromagnetic waves and electron plasma waves in high energy density plasmas using the covariant Wigner function approach. Based on the covariant Wigner function and Dirac equation, a relativistic quantum kinetic model is established to describe the physical processes in high-energy density plasmas. With the zero-temperature Fermi–Dirac distribution, the dispersion relation and Landau damping of waves containing the relativistic quantum corrected terms are derived. The relativistic quantum corrections to the dispersion relation and Landau damping are analyzed by comparing our results with those obtained in classical and non-relativistic quantum plasmas. We provide a detailed discussion on the Landau damping obtained in classical plasmas, non-relativistic Fermi plasmas and relativistic Fermi plasmas. The contributions of the Bohm potential, the Fermi statistics pressure and relativistic effects to the dispersion relation and Landau damping of waves are quantitatively calculated with real plasma parameters.

Jun Zhu; Peiyong Ji

2012-01-01T23:59:59.000Z

449

Extremal quantum cloning machines  

E-Print Network [OSTI]

We investigate the problem of cloning a set of states that is invariant under the action of an irreducible group representation. We then characterize the cloners that are "extremal" in the convex set of group covariant cloning machines, among which one can restrict the search for optimal cloners. For a set of states that is invariant under the discrete Weyl-Heisenberg group, we show that all extremal cloners can be unitarily realized using the so-called "double-Bell states", whence providing a general proof of the popular ansatz used in the literature for finding optimal cloners in a variety of settings. Our result can also be generalized to continuous-variable optimal cloning in infinite dimensions, where the covariance group is the customary Weyl-Heisenberg group of displacements.

G. Chiribella; G. M. D'Ariano; P. Perinotti; N. J. Cerf

2005-07-14T23:59:59.000Z

450

Comparing Double String Theory Actions  

E-Print Network [OSTI]

Aimed to a deeper comprehension of a manifestly T-dual invariant formulation of string theory, in this paper a detailed comparison between the non-covariant action proposed by Tseytlin and the covariant one proposed by Hull is done. These are obtained by making both the string coordinates and their duals explicitly appear, on the same foot, in the world-sheet action, so "doubling" the string coordinates along the compact dimensions. After a discussion of the nature of the constraints in both the models and the relative quantization, it results that the string coordinates and their duals behave like "non-commuting" phase space type coordinates but their expressions in terms of Fourier modes generate the oscillator algebra of the standard bosonic string formulation. A proof of the equivalence of the two formulations is given. Furthermore, open-string solutions are also discussed.

Luca De Angelis; S. J. Gabriele Gionti; Raffaele Marotta; Franco Pezzella

2013-12-27T23:59:59.000Z

451

Proper and improper density matrices and the consistency of the Deutsch model for Local Closed Timelike Curves  

E-Print Network [OSTI]

We discuss the concept of proper and improper density matrixes and we argue that this issue is of fundamental importance for the understanding of the quantum-mechanical CTC model proposed by Deutsch. We arrive at the conclusion that under a realistic interpretation, the distinction between proper and improper density operators is not a relativistically covariant notion and this fact leads to the conclusion that the D-CTC model is physically inconsistent.

A. C. Lobo; I. L. Paiva; P. R. Dieguez

2011-10-28T23:59:59.000Z

452

Relativistic Quantum Field Theory with a Physical State Vector  

E-Print Network [OSTI]

Evolution of a physical quantum state vector is described as governed by two distinct physical laws: Continuous, unitary time evolution and a relativistically covariant reduction process. In previous literature, it was concluded that a relativistically satisfactory version of the collapse postulate is in contradiction with physical measurements of a non-local state history. Here it is shown that such measurements are excluded when reduction is formulated as a physical process and the measurement devices are included as part of the state vector.

Bernd A. Berg

1998-07-17T23:59:59.000Z

453

Maps between Deformed and Ordinary Gauge Fields  

E-Print Network [OSTI]

In this paper, we introduce a map between the q-deformed gauge fields defined on the GL$_{q}(N) $-covariant quantum hyperplane and the ordinary gauge fields. Perturbative analysis of the q-deformed QED at the classical level is presented and gauge fixing $\\grave{a} $ la BRST is discussed. An other star product defined on the hybrid $(q,h) $% -plane is explicitly constructed .

L. Mesref

2005-04-13T23:59:59.000Z

454

Nuclear energy density functionals: what we can learn about/from their global performance?  

E-Print Network [OSTI]

A short review of recent results on the global performance of covariant energy density functionals is presented. It is focused on the analysis of the accuracy of the description of physical observables of ground and excited states as well as to related theoretical uncertainties. In addition, a global analysis of pairing properties is presented and the impact of pairing on the position of two-neutron drip line is discussed.

Afanasjev, A V; Ray, D; Ring, P

2015-01-01T23:59:59.000Z

455

December 26, 2005 11:22 Proceedings Trim Size: 9in x 6in WS5 CONFORMAL ANOMALIES VIA CANONICAL TRACES  

E-Print Network [OSTI]

December 26, 2005 11:22 Proceedings Trim Size: 9in x 6in WS5 CONFORMAL ANOMALIES VIA CANONICAL. Primary 58J40; Secondary 53B20, 58J28, 58J52. 1 #12; December 26, 2005 11:22 Proceedings Trim Size: 9in x is conformally covariant of bidegree (a; b) 2 R 2 #12; December 26, 2005 11:22 Proceedings Trim Si

Sart, Remi

456

Effects of source and level of zinc on feedlot performance and carcass characteristics in steers  

E-Print Network [OSTI]

carcass weight as a covariate. Steers fed ZnSO4 gained faster (P <.05) than steers fed ZnMet (2.01 vs 1.85 kg/d .?048). However, feed intake and feed efficiency were similar for ZnSO4 and ZnMet supplemented steers (I 1.2 vs 10.9 kg/d and 178 vs 170 g gain...

Nunnery, Greg Alan

1998-01-01T23:59:59.000Z

457

Investigating the effects of instruction on problem representation, domain knowledge, and problem solving in physics  

E-Print Network [OSTI]

to the problems. Pre- and posttests designed to measure domain knowledge and problem-solving were given to students in both control and experimental groups. Data were analyzed using Kruskal-Wallis tests and analysis of covariance (ANCOVA). Results indicate... and Control Groups. 3 Skewness and Kurtosis of Composite and Problem-by-Problem Variables for High and Low Representation Groups. . . . . . . . . . . . 35 4 Medians and Chi-square Approximations of Kruskal-Wallis Tests of Physical Representation Scores...

Schulze, Sharon Kay

2012-06-07T23:59:59.000Z

458

Misconception which led to the ‘‘material frame-indifference’’ controversy  

Science Journals Connector (OSTI)

The confusion over the nature of the useful restriction on the allowable forms of constitutive relations (‘‘material frame-indifference’’, or ‘‘objectivity’’) is due to the vague language of its formulation. In the final analysis, the confusion arises because the concept of general covariance of physical laws is applied in the inappropriate setting of the three-dimensional space instead of the four-dimensional space-time.

Gregory Ryskin

1985-08-01T23:59:59.000Z

459

Helicity -- from Clifford to Graphene  

E-Print Network [OSTI]

We investigate two seemingly disjoint definitions of helicity, one commonly used in particle physics, the other one used when studying bilinear covariants of Clifford algebras. We can prove that the `mathematical' definition of helicity implies its `physical' counterpart. As an unexpected application of our result we show that the Hamiltonian describing the one-layer superconductor Graphene is proportional to the trace of an operator that is used in the `mathematical' definition of helicity.

Christian G. Boehmer; Louie Corpe

2012-03-31T23:59:59.000Z

460

Where the wind blows: Assessing the effect of fixed and premium based feed-in tariffs on the spatial diversification of wind turbines  

Science Journals Connector (OSTI)

Abstract Feed-in tariffs (FIT) are among the most important policy instruments to promote renewable electricity production. The fixed-price FIT (FFIT), which guarantee a fixed price for every unit of produced electricity and the premium based FIT (PFIT), which pay a premium on top of the market price are commonly implemented in the EU. Costs for balancing intermittent electricity production may be significantly higher with FFIT than with PFIT, and FFIT do not provide any incentive to produce electricity when marginal production costs are high. In contrast, PFIT do provide strong incentives to better match renewable power output with marginal production costs in the system. The purpose of this article is to assess the effects of the two tariff schemes on the choice of wind turbine locations. In an analytical model, we show that both the covariance between wind power supply and demand as well as between the different wind power locations matter for investors in a PFIT scheme. High covariance with other intermittent producers causes a decrease in market prices and consequently in revenues for wind power investors. They are therefore incentivized to diversify the locations of wind turbines to decrease the covariance between different wind power production locations. In an empirical optimization model, we analyze the effects of these two different schemes in a policy experiment for Austria. The numerical results show that under a PFIT scheme, (1) spatial diversification is incentivized, (2) the covariance of wind power production with marginal electricity production costs increases, and (3) the variances of the wind power output and of residual load decrease if wind power deployment attains 10% of total national electricity consumption.

J. Schmidt; G. Lehecka; V. Gass; E. Schmid

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Recent Progress in Global PDF Analysis  

E-Print Network [OSTI]

We discuss selected topics in the forthcoming MSTW 2008 determination of parton distributions by global analysis. The tolerance parameter controlling the uncertainties on the parton distributions is now determined by a new dynamic procedure for each eigenvector of the covariance matrix. New data sets fitted include Tevatron Run II data on inclusive jet production, the lepton charge asymmetry from W decays and the Z rapidity distribution. Predictions are given for the total W and Z cross sections at the Tevatron and LHC.

Watt, G; Stirling, W J; Thorne, R S

2008-01-01T23:59:59.000Z

462

Green's Function expansion of scalar and vector fields in the presence of a medium  

E-Print Network [OSTI]

Based on a canonical approach and functional-integration techniques, a series expansion of Green's function of a scalar field, in the presence of a medium, is obtained. A series expansion for Lifshitz-energy, in finite-temperature, in terms of the susceptibility of the medium is derived and the whole formalism is generalized to the case of electromagnetic field in the presence of some dielectrics. A covariant formulation of the problem is presented.

Fardin Kheirandish; Shahriar Salimi

2010-10-17T23:59:59.000Z

463

Non-metric gravity: A status report  

E-Print Network [OSTI]

We review the status of a certain (infinite) class of four-dimensional generally covariant theories propagating two degrees of freedom that are formulated without any direct mention of the metric. General relativity itself (in its Plebanski formulation) belongs to the class, so these theories are examples of modified gravity. We summarize the current understanding of the nature of the modification, of the renormalizability properties of these theories, of their coupling to matter fields, and describe some of their physical properties.

Kirill Krasnov

2007-11-05T23:59:59.000Z

464

Gravito-magnetic vacuum spacetimes: kinematic restrictions  

E-Print Network [OSTI]

We show that there are no vacuum solutions with a purely magnetic Weyl tensor with respect to an observer submitted to kinematic restrictions involving first order differential scalars. This result generalizes previous ones for the vorticity-free and shear-free cases. We use a covariant approach which makes evident that only the Bianchi identities are used and, consequently, the results are also valid for non vacuum solutions with vanishing Cotton tensor.

J. J. Ferrando; J. A. Saez

2003-03-12T23:59:59.000Z

465

Model Specification Searches in Latent Growth Modeling: A Monte Carlo Study  

E-Print Network [OSTI]

that the error covariance structure is over parameterized (Everitt, 1998). More recently developed approaches for analyzing longitudinal data include multilevel modeling (MLM) and latent growth modeling (LGM). Although these two approaches were developed... of the commercially developed structural equation modeling (SEM) programs, such as LISREL, EQS, and Mplus, have included a multilevel analysis routine. In brief, MLM (Goldstein, 1995; Hox, 2002; Raudenbush & Bryk, 2002) analyzes longitudinal data with an univariate...

Kim, Min Jung

2012-07-16T23:59:59.000Z

466

The Standard Model and Fermion Masses  

E-Print Network [OSTI]

The paper formulates the Standard Model with massive fermions without introduction of the Yukawa interaction of Higgs bosons with fermions. For invariance to be preserved in the newly stated theory, the covariant derivative should be generalized, as follows. With such approach, Higgs bosons are responsible only for the gauge invariance of the boson sector of the theory and interact only with gauge bosons, gluons and photons.

V. P. Neznamov

2008-06-27T23:59:59.000Z

467

Static post-Newtonian equivalence of general relativity and gravity with a dynamical preferred frame  

Science Journals Connector (OSTI)

A generally covariant extension of general relativity (GR) in which a dynamical unit timelike vector field is coupled to the metric is studied in the asymptotic weak field limit of spherically symmetric static solutions. The two post-Newtonian parameters known as the Eddington-Robertson-Schiff parameters are found to be identical to those in the case of pure GR, except for some nongeneric values of the coefficients in the Lagrangian.

Christopher Eling and Ted Jacobson

2004-03-08T23:59:59.000Z

468

Response of six clones of eastern cottonwood (Populus deltoides Bartr.) to nutrients in sand culture  

E-Print Network [OSTI]

of Texas (Austin) Directed by: Dr. Robert G. Nerrifield Six select clones of eastern cottonwood were grown in sand culture on four treatments varying in N, P, and K. Growth parameters and leaf samples were collected during a 181 day growing season... extending from early Narch through mid-September An analysis of covariance indicated significant differences between treatments and between clones with respect to dry matter production, tree height, and stem diameter A clone x treatment interaction...

Isbell, Robert Reid

2012-06-07T23:59:59.000Z

469

Static post-Newtonian equivalence of GR and gravity with a dynamical preferred frame  

E-Print Network [OSTI]

A generally covariant extension of general relativity (GR) in which a dynamical unit timelike vector field is coupled to the metric is studied in the asymptotic weak field limit of spherically symmetric static solutions. The two post-Newtonian parameters known as the Eddington-Robertson-Schiff parameters are found to be identical to those in the case of pure GR, except for some non-generic values of the coefficients in the Lagrangian.

Christopher Eling; Ted Jacobson

2004-02-28T23:59:59.000Z

470

Green Functions For Wave Propagation on a 5D manifold and the Associated Gauge Fields Generated by a Uniformly Moving Point Source  

E-Print Network [OSTI]

Gauge fields associated with the manifestly covariant dynamics of particles in (3,1) spacetime are five-dimensional. We provide solutions of the classical 5D gauge field equations in both (4,1) and (3,2) flat spacetime metrics for the simple example of a uniformly moving point source. Green functions for the 5D field equations are obtained, which are consistent with the solutions for uniform motion obtained directly from the field equations with free asymptotic conditions.

I. Aharonovich; L. P. Horwitz

2006-03-30T23:59:59.000Z

471

Local wellposedness of Chern-Simons-Schrödinger  

E-Print Network [OSTI]

In this article we consider the initial value problem for the Chern-Simons-Schrodinger model in two space dimensions. This is a covariant NLS type problem which is L^2 critical. For this equation we introduce a so-called heat gauge, and prove that, with respect to this gauge, the problem is locally well-posed for initial data which is small in H^s, s > 0.

Baoping Liu; Paul Smith; Daniel Tataru

2012-12-06T23:59:59.000Z

472

Inhomogeneous High Frequency Expansion-Free Gravitational Waves  

E-Print Network [OSTI]

We describe a natural inhomogeneous generalization of high frequency plane gravitational waves. The waves are high frequency waves of the Kundt type whose null propagation direction in space-time has vanishing expansion, twist and shear but is not covariantly constant. The introduction of a cosmological constant is discussed in some detail and a comparison is made with high frequency gravity waves having wave fronts homeomorphic to 2-spheres.

C. Barrabes; P. A. Hogan

2007-06-18T23:59:59.000Z

473

Initial data for Einstein's equations with superposed gravitational waves  

E-Print Network [OSTI]

A method is presented to construct initial data for Einstein's equations as a superposition of a gravitational wave perturbation on an arbitrary stationary background spacetime. The method combines the conformal thin sandwich formalism with linear gravitational waves, and allows detailed control over characteristics of the superposed gravitational wave like shape, location and propagation direction. It is furthermore fully covariant with respect to spatial coordinate changes and allows for very large amplitude of the gravitational wave.

Harald P. Pfeiffer; Lawrence E. Kidder; Mark A. Scheel; Deirdre Shoemaker

2005-02-22T23:59:59.000Z

474

Lunar Laser Ranging and the Brans-Dicke Theory  

Science Journals Connector (OSTI)

Laser ranging to an optical corner reflector on the lunar surface may make possible a test of non-Newtonian gravitational theories. The results of a theoretical calculation of the Brans-Dicke corrections to the laser-pulse transit time are compared with results previously obtained for the Einstein theory. A further analysis of the measurable non-Newtonian correction term which dominates the predictions of both theories indicates that the term probably is common to all Lorentz-covariant gravitational theories.

Christine Krogh and Ralph Baierlein

1968-11-25T23:59:59.000Z

475

Relativistic Approach to the Hydrogen Atom in a Minimal Length Scenario  

E-Print Network [OSTI]

In this work we show that relativistic contributions to the ground state energy of the hydrogen atom arising from the presence of a minimal length introduced by a Lorentz-covariant algebra are more relevant than non-relativistic ones, and because of this the non-relativistic approach is not suitable. In addition, comparing our result with experimental data we can roughly estimate the upper bound for the minimal length value of the order $10^{-20}m$.

R. O. Francisco; T. L. Antonacci Oakes; J. C. Fabris; J. A. Nogueira

2014-02-19T23:59:59.000Z

476

Is there an Ay problem in low-energy neutron-proton scattering?  

E-Print Network [OSTI]

We calculate Ay in neutron-proton scattering for the interactions models WJC-1 and WJC-2 in the Covariant Spectator Theory. We find that the recent 12 MeV measurements performed at TUNL are in better agreement with our results than with the Nijmegen Phase Shift Analysis of 1993, and after reviewing the low-energy data, conclude that there is no Ay problem in low-energy np scattering.

Franz Gross; Alfred Stadler

2008-08-21T23:59:59.000Z

477

Application of the Veneziano model to the analysis of three pion charmonium decays  

SciTech Connect (OSTI)

We adapt the Veneziano model to the analysis of vector charmonium decays. Starting from a set of covariant Veneziano terms we show how to construct partial waves amplitudes that receive contributions from selected Regge trajectories. The amplitudes, nevertheless retain the proper asymptotic limit. This arises from duality between directly produced resonances and cross-channel Reggeon and in practical applications helps remove uncertainties in the parametrization of backgrounds.

Szczepaniak, Adam P.; Pennington, Michael R [JLAB

2014-10-01T23:59:59.000Z

478

Cosmology, Thermodynamics and Matter Creation  

E-Print Network [OSTI]

Several approaches to the matter creation problem in the context of cosmological models are summarily reviewed. A covariant formulation of the general relativistic imperfect simple fluid endowed with a process of matter creation is presented. By considering the standard big bang model, it is shown how the recent results of Prigogine et alii \\cite{1} can be recovered and, at the same time their limits of validity are explicited.

J. A. S. Lima; M. O. Calvao; I. Waga

2007-08-24T23:59:59.000Z

479

Accounting for Incomplete Species Detection in Fish Community Monitoring  

SciTech Connect (OSTI)

Riverine fish assemblages are heterogeneous and very difficult to characterize with a one-size-fits-all approach to sampling. Furthermore, detecting changes in fish assemblages over time requires accounting for variation in sampling designs. We present a modeling approach that permits heterogeneous sampling by accounting for site and sampling covariates (including method) in a model-based framework for estimation (versus a sampling-based framework). We snorkeled during three surveys and electrofished during a single survey in suite of delineated habitats stratified by reach types. We developed single-species occupancy models to determine covariates influencing patch occupancy and species detection probabilities whereas community occupancy models estimated species richness in light of incomplete detections. For most species, information-theoretic criteria showed higher support for models that included patch size and reach as covariates of occupancy. In addition, models including patch size and sampling method as covariates of detection probabilities also had higher support. Detection probability estimates for snorkeling surveys were higher for larger non-benthic species whereas electrofishing was more effective at detecting smaller benthic species. The number of sites and sampling occasions required to accurately estimate occupancy varied among fish species. For rare benthic species, our results suggested that higher number of occasions, and especially the addition of electrofishing, may be required to improve detection probabilities and obtain accurate occupancy estimates. Community models suggested that richness was 41% higher than the number of species actually observed and the addition of an electrofishing survey increased estimated richness by 13%. These results can be useful to future fish assemblage monitoring efforts by informing sampling designs, such as site selection (e.g. stratifying based on patch size) and determining effort required (e.g. number of sites versus occasions).

McManamay, Ryan A [ORNL] [ORNL; Orth, Dr. Donald J [Virginia Polytechnic Institute and State University] [Virginia Polytechnic Institute and State University; Jager, Yetta [ORNL] [ORNL

2013-01-01T23:59:59.000Z

480

Stellar energy-loss rates due to S, P, or T neutral currents  

Science Journals Connector (OSTI)

The energy-loss rate in stellar matter due to neutrino production is calculated assuming that the weak leptonic neutral current includes scalar, pseudoscalar, or tensor covariants. The processes e+ + e-?? + ?¯, ? + e?e + ? + ?¯, e + Z?e + Z + ? + ?¯, and ? + ??? + ?¯ are considered in the respective temperature and density regions of physical significance. Comparison with observed stellar lifetimes allows an upper limit to be placed on the new couplings.

Duane A. Dicus and Edward W. Kolb

1977-02-15T23:59:59.000Z

Note: This page contains sample records for the topic "leventis theo covary" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Quaternion Gravi-Electromagnetism  

E-Print Network [OSTI]

Defining the generalized charge, potential, current and generalized fields as complex quantities where real and imaginary parts represent gravitation and electromagnetism respectively, corresponding field equation, equation of motion and other quantum equations are derived in manifestly covariant manner. It has been shown that the field equations are invariant under Lorentz as well as duality transformations. It has been shown that the quaternionic formulation presented here remains invariant under quaternion transformations.

A. S. Rawat; O. P. S. Negi

2011-07-05T23:59:59.000Z

482

A consideration of a micro-Phillips' Curve  

E-Print Network [OSTI]

-Phillips' Curves using an SMSA as the definition of a labor market. Sixteen SMSA's were separately studied by regressing wage changes on the unemployment rate and the rate of change of unemploy- ment for monthly data. The sixteen SMSA's were then pooled via a... covariance model to form a national labor market. iv It was found that the estimated regression coefficient for the unemployment rate was insignificant at the . 10 level of significance on both the aggregate and disaggregate level. This suggests...

Paczkowski, Walter Richard

2012-06-07T23:59:59.000Z

483

Ris-R-1508(EN) ACCENT-BIAFLUX Workshop 2005  

E-Print Network [OSTI]

Department: Wind Energy Department Risø-R-1508(EN) April 2005 ISSN 0106-2840 ISBN 87-550-3421-7 Contract no Measurements above Norway Spruce 13 1.8 (P2) Eddy covariance flux measurements of NO and NO2/NOy over a mixed nitrogen flux measurements in Norway supported by the EMEP deposition module 27 2.4 (P13) Scanning biogenic

484

Bootstrapping the statistical uncertainties of NN scattering data  

E-Print Network [OSTI]

We use the Monte Carlo bootstrap as a method to simulate pp and np scattering data below pion production threshold from an initial set of over 6700 experimental mutually $3\\sigma$ consistent data. We compare the results of the bootstrap, with 1020 statistically generated samples of the full database, with the standard covariance matrix method of error propagation. No significant differences in scattering observables and phase shifts are found. This suggests alternative strategies for propagating errors of nuclear forces in nuclear structure calculations.

R. Navarro Perez; J. E. Amaro; E. Ruiz Arriola

2014-07-15T23:59:59.000Z

485

The micro and macro determinants of senator evaluations: a multilevel analysis using the 1988-1992 senate elections studies  

E-Print Network [OSTI]

Linear Model with Intercepts Varying at the Senator/State Level 49 18 Bivariate Statistics of Individual-Level Independent Variables with the Lower Triangle listing the Variance/Covariance Matrix and the Upper Triangle listing the Correlation... activity within the Senate have on the evaluation? What are the effects of size of the state population and party competition within the state? How do characteristics of the senator or state mediate the 18 individual level differences? To what degree do...

Swenson, Tami Charlotte

2012-06-07T23:59:59.000Z

486

SPECTRAL AND INTERMITTENCY PROPERTIES OF RELATIVISTIC TURBULENCE  

SciTech Connect (OSTI)

High-resolution numerical simulations are utilized to examine isotropic turbulence in a compressible fluid when long-wavelength velocity fluctuations approach light speed. Spectral analysis reveals an inertial sub-range of relativistic motions with a broadly 5/3 index. The use of generalized Lorentz covariant structure functions based on the four-velocity is proposed. These structure functions extend the She-Leveque model for intermittency into the relativistic regime.

Zrake, Jonathan; MacFadyen, Andrew I. [Center for Cosmology and Particle Physics, Physics Department, New York University, New York, NY 10003 (United States)

2013-01-20T23:59:59.000Z

487

Comparison of nuclear data uncertainty propagation methodologies for PWR burn-up simulations  

E-Print Network [OSTI]

Several methodologies using different levels of approximations have been developed for propagating nuclear data uncertainties in nuclear burn-up simulations. Most methods fall into the two broad classes of Monte Carlo approaches, which are exact apart from statistical uncertainties but require additional computation time, and first order perturbation theory approaches, which are efficient for not too large numbers of considered response functions but only applicable for sufficiently small nuclear data uncertainties. Some methods neglect isotopic composition uncertainties induced by the depletion steps of the simulations, others neglect neutron flux uncertainties, and the accuracy of a given approximation is often very hard to quantify. In order to get a better sense of the impact of different approximations, this work aims to compare results obtained based on different approximate methodologies with an exact method, namely the NUDUNA Monte Carlo based approach developed by AREVA GmbH. In addition, the impact of different covariance data is studied by comparing two of the presently most complete nuclear data covariance libraries (ENDF/B-VII.1 and SCALE 6.0), which reveals a high dependency of the uncertainty estimates on the source of covariance data. The burn-up benchmark Exercise I-1b proposed by the OECD expert group "Benchmarks for Uncertainty Analysis in Modeling (UAM) for the Design, Operation and Safety Analysis of LWRs" is studied as an example application. The burn-up simulations are performed with the SCALE 6.0 tool suite.

Carlos Javier Diez; Oliver Buss; Axel Hoefer; Dieter Porsch; Oscar Cabellos

2014-11-04T23:59:59.000Z

488

Universal correlators and distributions as experimental signatures of 2+1 Kardar-Parisi-Zhang growth  

E-Print Network [OSTI]

We examine height-height correlations in the transient growth regime of the 2+1 Kardar-Parisi-Zhang (KPZ) universality class, with a particular focus on the {\\it spatial covariance} of the underlying two-point statistics, higher-dimensional analog of the 1+1 KPZ Class Airy$_1$ process. Making comparison to AFM kinetic roughening data in 2d organic thin films, we use our universal 2+1 KPZ spatial covariance to extract key scaling parameters for this experimental system. Additionally, we explore the i) height, ii) local roughness, and iii) extreme value distributions characteristic of these oligomer films, finding compelling agreement in all instances with our numerical integration of the KPZ equation itself. Finally, investigating nonequilibrium relaxation phenomena exhibited by 2+1 KPZ Class models, we have unearthed a universal KPZ ageing kinetics. In experiments with ample data in the time domain, our 2+1 KPZ Euler {\\it temporal covariance} will allow a quick, independent estimate of the central KPZ scaling parameter.

T. Halpin-Healy; G. Palasantzas

2014-03-28T23:59:59.000Z

489

Time-of-arrival distributions from position-momentum and energy-time joint measurements  

E-Print Network [OSTI]

The position-momentum quasi-distribution obtained from an Arthurs and Kelly joint measurement model is used to obtain indirectly an ``operational'' time-of-arrival (TOA) distribution following a quantization procedure proposed by Kocha\\'nski and W\\'odkiewicz [Phys. Rev. A 60, 2689 (1999)]. This TOA distribution is not time covariant. The procedure is generalized by using other phase-space quasi-distributions, and sufficient conditions are provided for time covariance that limit the possible phase-space quasi-distributions essentially to the Wigner function, which, however, provides a non-positive TOA quasi-distribution. These problems are remedied with a different quantization procedure which, on the other hand, does not guarantee normalization. Finally an Arthurs and Kelly measurement model for TOA and energy (valid also for arbitrary conjugate variables when one of the variables is bounded from below) is worked out. The marginal TOA distribution so obtained, a distorted version of Kijowski's distribution, is time covariant, positive, and normalized.

A. D. Baute; I. L. Egusquiza; J. G. Muga; R. Sala-Mayato

1999-11-19T23:59:59.000Z

490

Path integral quantization of parametrised field theory  

E-Print Network [OSTI]

Free scalar field theory on a flat spacetime can be cast into a generally covariant form known as parametrised field theory in which the action is a functional of the scalar field as well as the embedding variables which describe arbitrary, in general curved, foliations of the flat spacetime. We construct the path integral quantization of parametrised field theory in order to analyse issues at the interface of quantum field theory and general covariance in a path integral context. We show that the measure in the Lorentzian path integral is non-trivial and is the analog of the Fradkin- Vilkovisky measure for quantum gravity. We construct Euclidean functional integrals in the generally covariant setting of parametrised field theory using key ideas of Schleich and show that our constructions imply the existence of non-standard `Wick rotations' of the standard free scalar field 2 point function. We develop a framework to study the problem of time through computations of scalar field 2 point functions. We illustrate our ideas through explicit computation for a time independent 1+1 dimensional foliation. Although the problem of time seems to be absent in this simple example, the general case is still open. We discuss our results in the contexts of the path integral formulation of quantum gravity and the canonical quantization of parametrised field theory.

Madhavan Varadarajan

2004-04-06T23:59:59.000Z

491

Chern-Simons Spinor Electrodynamics in the Light-Cone Gauge  

E-Print Network [OSTI]

The one-loop quantum corrections of Chern-Simons spinor electrodynamics in the light-cone gauge has been investigated. We have calculated the vacuum polarization tensor, fermionic self-energy and on-shell vertex correction with a hybrid regularization consisting of a higher covariant derivative regularization and dimensional continuation. The Mandelstam-Leibbrandt prescription is used to handle the spurious light-cone singularity in the gauge field propagator. We then perform the finite renormalization to define the quantum theory. The generation of the parity-even Maxwell term and the arising of anomalous magnetic moment from quantum corrections are reproduced as in the case of a covariant gauge choice. The Ward identities in the light-cone gauge are verified to satisfy explicitly. Further, we have found the light-cone vector dependent sector of local quantum effective action for the fermion is explicitly gauge invariant, and hence the covariance of $S$-matrix elements of the theory can be achieved.

Wenfeng Chen

2012-09-30T23:59:59.000Z

492

Ordovician carbonate formation waters in the Illinois Basin: Chemical and isotopic evolution beneath a regional aquitard  

SciTech Connect (OSTI)

Formation waters from carbonate reservoirs in the upper Ordovician Galena Group of the Illinois Basin have been analyzed geochemically to study origin of salinity, chemical and isotopic evolution, and relation to paleohydrologic flow systems. These carbonate reservoirs underlie the Maquoketa Shale Group of Cincinnatian age, which forms a regional aquitard. Cl-Br relations and Na/Br-Cl/Br systematics indicate that initial brine salinity resulted from subaerial evaporation of seawater to a point not significantly beyond halite saturation. Subsequent dilution in the subsurface by meteoric waters is supported by delta D-delta O-18 covariance. Systematic relations between Sr-87/Sr-86 and 1/Sr suggest two distinct mixing events: introduction of a Sr-87 enriched fluid from a siliciclastic source, and a later event which only affected reservoir waters from the western shelf of the basin. The second mixing event is supported by covariance between Sr-87/Sr-86 and concentrations of cations and anions; covariance between Sr and O-D isotopes suggests that the event is related to meteoric water influx. Systematic geochemical relations in ordovician Galena Group formation waters have been preserved by the overlying Maquoketa shale aquitard. Comparison with results from previous studies indicates that waters from Silurian-Devonian carbonate strata evolved in a manner similar to yet distinct from that of the Ordovician carbonate waters, whereas waters from Mississippian-Pennsylvanian strata that overlie the New Albany Shale Group regional aquitard are marked by fundamentally different Cl-Br-Na and Sr isotope systematics. Evolution of these geochemical formation-water regimes apparently has been influenced significantly by paleohydrologic flow systems.

Stueber, A.M. (Illinois Univ., Edwardsville, IL (United States)); Walter, L.M. (Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Geological Sciences)

1992-01-01T23:59:59.000Z

493

Some remarks on the use of effective Lagrangians in QED and QCD  

E-Print Network [OSTI]

We discuss in this article the usefulness of the effective Lagrangians (L_eff) of QED and QCD within the one-loop approximation. Instead of calculating L_eff via complicated computations with Schwinger's proper-time technique or Feynman graphs, we prefer to employ the energy-momentum tensor and the leading-log model. The advantage is that we do not have to demand the external electromagnetic or color field to be constant. There are also some critical remarks added which cast doubt on the use of LQCD with covariant constant fields in explaining the nature of the QCD vacuum.

Dittrich, Walter

2015-01-01T23:59:59.000Z

494

Electroweak Radiative Corrections to the Parity-violating Asymmetry for SLAC Experiment E158  

SciTech Connect (OSTI)

Electroweak radiative corrections to observable quantities of Moeller scattering of polarized particles are calculated. We emphasize the contribution induced by infrared divergent parts of cross section. The covariant method is used to remove infrared divergences, so that our results do not involve any unphysical parameters. When applied to the kinematics of SLAC E158 experiment, these corrections reduce the parity violating asymmetry by about -6.5% at E = 48 GeV and y = 0.5, and kinematically weighted 'hard' bremsstrahlung effect for SLAC E158 is {approx} 1%.

Zykunov, Vladimir A.; /Gomel State Tech. U.

2012-04-04T23:59:59.000Z

495

The reaction ?N???N in chiral effective field theory with explicit ?(1232) degrees of freedom  

Science Journals Connector (OSTI)

The reaction ?N???N is studied at tree level up to next-to-leading order in the framework of manifestly covariant baryon chiral perturbation theory with explicit ?(1232) degrees of freedom. Using total cross-section data to determine the relevant low-energy constants, predictions are made for various differential as well as total cross sections at higher energies. A detailed comparison of results based on the heavy-baryon and relativistic formulations of chiral perturbation theory with and without explicit ? degrees of freedom is given.

D. Siemens; V. Bernard; E. Epelbaum; H. Krebs; Ulf-G. Meißner

2014-06-30T23:59:59.000Z

496

Inertia and gravitation in teleparallel gravity  

E-Print Network [OSTI]

Using the fact that teleparallel gravity allows a separation between gravitation and inertia, explicit expressions for the gravitational and the inertial energy-momentum densities are obtained. It is shown that, like all other fields of nature, gravitation alone has a tensorial energy-momentum density which in a general frame is conserved in the covariant sense. Together with the inertial energy-momentum density, they form a pseudotensor which is conserved in the ordinary sense. An analysis of the role played by the gravitational and the inertial densities in the computation of the total energy and momentum of gravity is presented.

R. Aldrovandi; Tiago Gribl Lucas; J. G. Pereira

2009-08-14T23:59:59.000Z

497

Maps for currents and anomalies in noncommutative gauge theories  

E-Print Network [OSTI]

We derive maps relating currents and their divergences in non-abelian U(N) noncommutative gauge theory with the corresponding expressions in the ordinary (commutative) description. For the U(1) theory, in the slowly-varying-field approximation, these maps are also seen to connect the star-gauge-covariant anomaly in the noncommutative theory with the standard Adler--Bell--Jackiw anomaly in the commutative version. For arbitrary fields, derivative corrections to the maps are explicitly computed up to O(\\theta^2).

Rabin Banerjee; Kuldeep Kumar

2005-04-13T23:59:59.000Z

498

Searching for dark matter at LHC with Mono-Higgs production  

E-Print Network [OSTI]

We consider LHC searches for dark matter in the mono-Higgs channel using the tools of effective field theory. This channel takes unique advantage of the presence of $SU(2)_L$ breaking in those operators to avoid the need for any initial-state radiation, usually necessary to tag the production of invisible particles. We find that sensitivities to parameters describing dark matter interactions with standard model particles are comparable to those from monojet searches for a subset of the usually-considered operators, and we present for the first time bounds from collider searches on operators which couple DM to only the Higgs field or its covariant derivatives.

Alexey A. Petrov; William Shepherd

2013-11-06T23:59:59.000Z

499

Partial wave analysis of $J/?\\to ???$  

E-Print Network [OSTI]

Based on a sample of $2.25\\times 10^{8}$ $J/\\psi$ events collected with the BESIII detector at BEPCII, a full partial wave analysis on $J/\\psi\\to\\gamma\\eta\\eta$ was performed using the relativistic covariant tensor amplitude method. The results show that the dominant $0^{++}$ and $2^{++}$ components are from the $f_0(1710)$, $f_0(2100)$, $f_0(1500)$, $f_2'(1525)$, $f_2(1810)$ and $f_2(2340)$. The resonance parameters and branching fractions are also presented.

M. Ablikim; M. N. Achasov; O. Albayrak; D. J. Ambrose; F. F. An; Q. An; J. Z. Bai; R. Baldini Ferroli; Y. Ban; J. Becker; J. V. Bennett; N. Berger; M. Bertani; J. M. Bian; E. Boger; O. Bondarenko; I. Boyko; R. A. Briere; V. Bytev; H. Cai; X. Cai; O. Cakir; A. Calcaterra; G. F. Cao; S. A. Cetin; J. F. Chang; G. Chelkov; G. Chen; H. S. Chen; J. C. Chen; M. L. Chen; S. J. Chen; X. Chen; Y. B. Chen; H. P. Cheng; Y. P. Chu; D. Cronin-Hennessy; H. L. Dai; J. P. Dai; D. Dedovich; Z. Y. Deng; A. Denig; I. Denysenko; M. Destefanis; W. M. Ding; Y. Ding; L. Y. Dong; M. Y. Dong; S. X. Du; J. Fang; S. S. Fang; L. Fava; C. Q. Feng; P. Friedel; C. D. Fu; J. L. Fu; Y. Gao; C. Geng; K. Goetzen; W. X. Gong; W. Gradl; M. Greco; M. H. Gu; Y. T. Gu; Y. H. Guan; A. Q. Guo; L. B. Guo; T. Guo; Y. P. Guo; Y. L. Han; F. A. Harris; K. L. He; M. He; Z. Y. He; T. Held; Y. K. Heng; Z. L. Hou; C. Hu; H. M. Hu; J. F. Hu; T. Hu; G. M. Huang; G. S. Huang; J. S. Huang; L. Huang; X. T. Huang; Y. Huang; Y. P. Huang; T. Hussain; C. S. Ji; Q. Ji; Q. P. Ji; X. B. Ji; X. L. Ji; L. L. Jiang; X. S. Jiang; J. B. Jiao; Z. Jiao; D. P. Jin; S. Jin; F. F. Jing; N. Kalantar-Nayestanaki; M. Kavatsyuk; B. Kopf; M. Kornicer; W. Kuehn; W. Lai; J. S. Lange; M. Leyhe; C. H. Li; Cheng Li; Cui Li; D. M. Li; F. Li; G. Li; H. B. Li; J. C. Li; K. Li; Lei Li; Q. J. Li; S. L. Li; W. D. Li; W. G. Li; X. L. Li; X. N. Li; X. Q. Li; X. R. Li; Z. B. Li; H. Liang; Y. F. Liang; Y. T. Liang; G. R. Liao; X. T. Liao; D. Lin; B. J. Liu; C. L. Liu; C. X. Liu; F. H. Liu; Fang Liu; Feng Liu; H. Liu; H. B. Liu; H. H. Liu; H. M. Liu; H. W. Liu; J. P. Liu; K. Liu; K. Y. Liu; Kai Liu; P. L. Liu; Q. Liu; S. B. Liu; X. Liu; Y. B. Liu; Z. A. Liu; Zhiqiang Liu; Zhiqing Liu; H. Loehner; G. R. Lu; H. J. Lu; J. G. Lu; Q. W. Lu; X. R. Lu; Y. P. Lu; C. L. Luo; M. X. Luo; T. Luo; X. L. Luo; M. Lv; C. L. Ma; F. C. Ma; H. L. Ma; Q. M. Ma; S. Ma; T. Ma; X. Y. Ma; F. E. Maas; M. Maggiora; Q. A. Malik; Y. J. Mao; Z. P. Mao; J. G. Messchendorp; J. Min; T. J. Min; R. E. Mitchell; X. H. Mo; C. Morales Morales; N. Yu. Muchnoi; H. Muramatsu; Y. Nefedov; C. Nicholson; I. B. Nikolaev; Z. Ning; S. L. Olsen; Q. Ouyang; S. Pacetti; J. W. Park; M. Pelizaeus; H. P. Peng; K. Peters; J. L. Ping; R. G. Ping; R. Poling; E. Prencipe; M. Qi; S. Qian; C. F. Qiao; L. Q. Qin; X. S. Qin; Y. Qin; Z. H. Qin; J. F. Qiu; K. H. Rashid; G. Rong; X. D. Ruan; A. Sarantsev; B. D. Schaefer; M. Shao; C. P. Shen; X. Y. Shen; H. Y. Sheng; M. R. Shepherd; X. Y. Song; S. Spataro; B. Spruck; D. H. Sun; G. X. Sun; J. F. Sun; S. S. Sun; Y. J. Sun; Y. Z. Sun; Z. J. Sun; Z. T. Sun; C. J. Tang; X. Tang; I. Tapan; E. H. Thorndike; D. Toth; M. Ullrich; I. U. Uman; G. S. Varner; B. Q. Wang; D. Wang; D. Y. Wang; K. Wang; L. L. Wang; L. S. Wang; M. Wang; P. Wang; P. L. Wang; Q. J. Wang; S. G. Wang; X. F. Wang; X. L. Wang; Y. D. Wang; Y. F. Wang; Y. Q. Wang; Z. Wang; Z. G. Wang; Z. Y. Wang; D. H. Wei; J. B. Wei; P. Weidenkaff; Q. G. Wen; S. P. Wen; M. Werner; U. Wiedner; L. H. Wu; N. Wu; S. X. Wu; W. Wu; Z. Wu; L. G. Xia; Y. X. Xia; Z. J. Xiao; Y. G. Xie; Q. L. Xiu; G. F. Xu; G. M. Xu; Q. J. Xu; Q. N. Xu; X. P. Xu; Z. R. Xu; F. Xue; Z. Xue; L. Yan; W. B. Yan; Y. H. Yan; H. X. Yang; Y. Yang; Y. X. Yang; H. Ye; M. Ye; M. H. Ye; B. X. Yu; C. X. Yu; H. W. Yu; J. S. Yu; S. P. Yu; C. Z. Yuan; Y. Yuan; A. A. Zafar; A. Zallo; Y. Zeng; B. X. Zhang; B. Y. Zhang; C. Zhang; C. C. Zhang; D. H. Zhang; H. H. Zhang; H. Y. Zhang; J. Q. Zhang; J. W. Zhang; J. Y. Zhang; J. Z. Zhang; Li Li Zhang; R. Zhang; S. H. Zhang; X. J. Zhang; X. Y. Zhang; Y. Zhang; Y. H. Zhang; Z. P. Zhang; Z. Y. Zhang; Zhenghao Zhang; G. Zhao; H. S. Zhao; J. W. Zhao; K. X. Zhao; Lei Zhao; Ling Zhao; M. G. Zhao; Q. Zhao; Q. Z. Zhao; S. J. Zhao; T. C. Zhao; X. H. Zhao; Y. B. Zhao; Z. G. Zhao; A. Zhemchugov; B. Zheng; J. P. Zheng; Y. H. Zheng; B. Zhong; Z. Zhong; L. Zhou; X. Zhou; X. K. Zhou; X. R. Zhou; C. Zhu; K. Zhu; K. J. Zhu; S. H. Zhu; X. L. Zhu; Y. C. Zhu; Y. M. Zhu; Y. S. Zhu; Z. A. Zhu; J. Zhuang; B. S. Zou; J. H. Zou

2013-01-01T23:59:59.000Z

500

1. (i) (a) We have Var(Xn) = 2  

E-Print Network [OSTI]

+ we get R(v) = 2 for v R. [10] UNSEEN (ii) (a) We calculate ESt = etµ EeWt = etµ 1 2t R ex e-x2 2t of Bt is EBt = EWt - tEW1 = 0. The covariance function is E(BtBs) = E(WtWs) - sE(WtW1) - tEW1Ws + tsEW2 1 = min(t, s) - ts. [5] SEEN (ii) The process ^Bt = (1 - t)W t 1 - t is Gaussian since W

Pavliotis, Grigorios