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1

Multilevel bioluminescence tomography based on radiative transfer equation  

E-Print Network (OSTI)

, "A fast forward solver of radiative transfer equation," Transport Theory and Statistical Physics 38Multilevel bioluminescence tomography based on radiative transfer equation Part 1: l1 approach for bioluminescence tomography based on radiative transfer equation with the emphasis on improving

Soatto, Stefano

2

Radiative Transfer in Terms of Integral Equations  

Science Journals Connector (OSTI)

... linear integral equation of the Fredholm type. Another year after that (1914), K. Schwarzschild showed that the problem of the radiative equilibrium of an atmosphere leads to a Fredholm ... of an atmosphere leads to a Fredholm equation, and Milne, ten years later, extended Schwarzschild's work by showing how different transfer problems all lead to similar types of integral ...

SVEIN ROSSELAND

1950-07-29T23:59:59.000Z

3

Multilevel bioluminescence tomography based on radiative transfer equation  

E-Print Network (OSTI)

Multilevel bioluminescence tomography based on radiative transfer equation Part 2: total variation with both l1 and total- variation norm for bioluminescence tomography based on radiative transfer equation, Radiative Transfer (Dover Publications, 1960). 14. K. M. Case and P. F. PF Zweifel, Linear Transport Theory

Soatto, Stefano

4

Discrete Ordinate Method for Solving Inhomogeneous Vector Radiative Transfer Equation  

E-Print Network (OSTI)

paper.. This type of equation appears when modeling radiative transport in plane parallel media. WeDiscrete Ordinate Method for Solving Inhomogeneous Vector Radiative Transfer Equation We describe here a solution method for equations of the type given by: µ I(,µ) +I(,µ)- () 2 1 -1 Z(,µ,µ )I(,µ )dµ

Pattanaik, Sumanta N.

5

Di usion Approximation of Radiative Transfer Equations in a Channel  

E-Print Network (OSTI)

direction. 1 #12; 1 Introduction Radiative transport equations were #12;rst used to describe the propagationDi#11;usion Approximation of Radiative Transfer Equations in a Channel Guillaume Bal Department by a di#11;usion equation. However, the thickness of the crust is of the order of the transport mean free

Bal, Guillaume

6

Three-dimensional optical tomography with the equation of radiative transfer  

E-Print Network (OSTI)

on a transport-backtransport method applied to the two-dimensional time-dependent equation of radiative transferThree-dimensional optical tomography with the equation of radiative transfer Gassan S. Abdoulaev reconstruction scheme that is based on the time-independent equation of radiative transfer (ERT) and allows

Hielscher, Andreas

7

Approximating the time-domain radiative transfer equation using truncated Fourier series  

Science Journals Connector (OSTI)

The radiative transfer equation describes propagation of light in scattering media. It is widely used model, with applications in medical imaging, astronomy and atmospheric sciences to...

Pulkkinen, Aki; Tarvainen, Tanja

8

A HIGH-ORDER-ACCURATE GPU-BASED RADIATIVE TRANSFER EQUATION SOLVER FOR COMBUSTION  

E-Print Network (OSTI)

is a dominant mode of heat transfer in combustion systems such as rocket engines, scramjets, and industrial development to result in a robust and fail-safe design. Hydrocarbon combustion results in exhaust gases whichA HIGH-ORDER-ACCURATE GPU-BASED RADIATIVE TRANSFER EQUATION SOLVER FOR COMBUSTION AND PROPULSION

Pilon, Laurent

9

Multilevel bioluminescence tomography based on radiative transfer equation Part 1: l1 regularization  

E-Print Network (OSTI)

problem for the radiative transport equation, Inv. Prob.the beginning, radiative transport equation (RTE) is used as

Gao, Hao; Zhao, Hongkai

2010-01-01T23:59:59.000Z

10

Solution of the equation of radiative transfer using a NewtonKrylov approach and adaptive mesh refinement  

E-Print Network (OSTI)

Solution of the equation of radiative transfer using a Newton­Krylov approach and adaptive mesh Available online 25 November 2011 Keywords: Radiation transport Discrete ordinates method Finite ordinates method (DOM) and finite-volume method (FVM) are used exten- sively to solve the radiative transfer

Groth, Clinton P. T.

11

Asymptotic Preserving Unified Gas Kinetic Scheme for Grey Radiative Transfer Equations  

E-Print Network (OSTI)

The solutions of radiative transport equations can cover both optical thin and optical thick regimes due equations, where the radiation transport equation is coupled with the material thermal energy equation(2013), 138-156] from a one-dimensional linear radiation transport equation to a nonlinear two

Xu, Kun

12

RADIATIVE TRANSFER IN ULTRARELATIVISTIC OUTFLOWS  

SciTech Connect

Analytical and numerical solutions are obtained for the equation of radiative transfer in ultrarelativistic opaque jets. The solution describes the initial trapping of radiation, its adiabatic cooling, and the transition to transparency. Two opposite regimes are examined. (1) Matter-dominated outflow. Surprisingly, radiation develops enormous anisotropy in the fluid frame before decoupling from the fluid. The radiation is strongly polarized. (2) Radiation-dominated outflow. The transfer occurs as if radiation propagated in vacuum, preserving the angular distribution and the blackbody shape of the spectrum. The escaping radiation has a blackbody spectrum if (and only if) the outflow energy is dominated by radiation up to the photospheric radius.

Beloborodov, Andrei M., E-mail: amb@phys.columbia.edu [Physics Department and Columbia Astrophysics Laboratory, Columbia University, 538 West 120th Street New York, NY 10027 (United States)

2011-08-20T23:59:59.000Z

13

The universal radiative transport equation  

E-Print Network (OSTI)

THE UNIVERSAL RADIATIVE TRANSPORT EQUATION Rudolph W.The Universal Radiative Transport Equation Rudolph W.The various radiative transport equations used in general

Preisendorfer, Rudolph W

1959-01-01T23:59:59.000Z

14

Multi-model Preconditioning for Radiative Transfer Problems  

E-Print Network (OSTI)

, multigrid, radiative transfer, neutron transport, linear Boltzmann equation 2000 MSC: 65N22, 85A25, 65N30 1 and radiation dominated regions must be combined. Since the character of the equation is very different in those of the monochromatic radiative transfer problem leads to a diffusion equation, approximating the radiative transfer

15

Journal of Quantitative Spectroscopy & Radiative Transfer 72 (2002) 691713  

E-Print Network (OSTI)

: Equation of radiative transfer; Transport theory; Photon propagation; Scattering media; Discrete.elsevier.com/locate/jqsrt Optical tomography using the time-independent equation of radiative transfer -- Part 1: forward model optical tomographic imaging algorithm that is based on the equation of radiative transfer. Using

Hielscher, Andreas

16

Linear Kinetic Heat Transfer: Moment Equations, Boundary Conditions, and Knudsen  

E-Print Network (OSTI)

] and phonons [6], and the radiative transfer equation [7]. The solution of any kinetic equation is usually][25], radiative transfer [7][26], and phonon transport in crystals [6]. Despite the long history, and success method, and the methods employed in [18][19][20], are based solely on the transport equations in the bulk, and

Struchtrup, Henning

17

A dynamic multi-scale model for transient radiative transfer calculations  

E-Print Network (OSTI)

on the radiative transfer equation (RTE) or the diffusion equation (DE). The RTE is a kinetic transport equation-scale model which couples the transient radiative transfer equation (RTE) and the diffusion equation (DE: transient radiative transfer, multi-scale model, finite volume method, diffusion equation, domain

Boyer, Edmond

18

Transfer equation in accelerated media  

Science Journals Connector (OSTI)

The transfer equation for photons is obtained from the Lindquist formalism in curvilinear coordinates (no symmetry assumed), in an arbitrary frame and in any basis (natural or physical), to first order in O(v/c). Acceleration terms in the fluid are introduced via a modification of the metric tensor. The local tetrad attached to the accelerated fluid element follows a Fermi-Walker transport. Lorentz transformations are used to transform locally the equation from Lagrangian to Eulerian space-time coordinates. The resulting equation agrees in the case of a local Minkowskian space with the equation obtained directly using special-relativistic considerations.

Alain Munier

1986-04-15T23:59:59.000Z

19

Lattice Boltzmann method for one-dimensional radiation transfer  

Science Journals Connector (OSTI)

The macroscopic conservation equations of radiation energy and radiation momentum are derived on the basis of radiation hydrodynamics. Based on the Chapman-Enskog method, the lattice Boltzmann model for one-dimensional radiative transfer is proposed from the Boltzmann equation. The numerical simulation results agree well with the exact solution and show that the lattice Boltzmann method developed in this paper has good accuracy and stability for solving one-dimensional radiative transfer problems.

Yu Ma; ShiKui Dong; HePing Tan

2011-07-14T23:59:59.000Z

20

Journal of Quantitative Spectroscopy & Radiative Transfer 98 (2006) 220237  

E-Print Network (OSTI)

discontinuities associated with the propagation of a radiation front in transient radiation transport. r 2005 q heat flux s geometric path length S source term in the radiative transfer equation t time tc timeJournal of Quantitative Spectroscopy & Radiative Transfer 98 (2006) 220­237 Modified method

Pilon, Laurent

Note: This page contains sample records for the topic "radiative transfer equation" 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

A High-Order-Accurate GPU-Based Radiative Transfer Equation Solver for Combustion and Propulsion Applications  

E-Print Network (OSTI)

radiative heat flux through the grid element boundary sstair-case grid. Figure 5 shows the net radiative heat fluxgrid consisted of 6872 tetrahedral elements. The dimensionless radiative heat

He, Xing; Lee, Euntaek; Wilcox, Lucas; Munipalli, Ramakanth; Pilon, Laurent

2013-01-01T23:59:59.000Z

22

Two-frequency radiative transfer and asymptotic solution  

E-Print Network (OSTI)

radiative transfer equation has been derived with full mathematical rigor [13,14]. In the case the wave nature of the process and is not just about energy transport. Hence the governing equation cannotTwo-frequency radiative transfer and asymptotic solution Albert C. Fannjiang* Department

Fannjiang, Albert

23

Journal of Quantitative Spectroscopy & Radiative Transfer 91 (2005) 2746  

E-Print Network (OSTI)

used in the field of transport phenomena simulation, and more specifically in the field of radiative (application of the reciprocity principle to the integral form of the radiative transfer equation), and to netJournal of Quantitative Spectroscopy & Radiative Transfer 91 (2005) 27­46 A boundary-based net

Dufresne, Jean-Louis

24

Radiative Transfer in Interacting Media J.Kenneth Shultis  

E-Print Network (OSTI)

of nuclear energy. Today, radiative transport plays an important role in many other areas besides nuclear, and many others. 1.1 Radiative Transfer Regimes The transport of radiant energy through a medium falls shielding analyses, the radiative transfer equation is linear, and a wealth of numerical techniques exist

Shultis, J. Kenneth

25

Journal of Quantitative Spectroscopy & Radiative Transfer 94 (2005) 357371  

E-Print Network (OSTI)

rights reserved. Keywords: Time dependent radiation transport; M1 approximation; Multigroup models; Mean that solve the radiative transfer equation at a low cost. Among these models, we find diffusion, flux this equation, see [3] and [4]. The first three angular moments of the radiative intensity are defined as Eðn

Coudière, Yves

26

Journal of Quantitative Spectroscopy & Radiative Transfer 73 (2002) 159168  

E-Print Network (OSTI)

-dependence of radiative transport due to the large but ÿnite speed of radiation propagation must be incorporated usion approximation is often used to describe the transient radiation transport [5]. However, recent the fully transient radiative transfer equation. Kumar et al. [8] and Kumar and Mitra [9] were among

Guo, Zhixiong "James"

27

A FAST FORWARD SOLVER OF RADIATIVE TRANSFER HAO GAO AND HONGKAI ZHAO  

E-Print Network (OSTI)

studying the numerical solutions to the radiative transport equation (RTE) or the within-group neutron transport equation [4, 13] in the field of neutron transport [4], atmospheric radiative transfer [1], heatA FAST FORWARD SOLVER OF RADIATIVE TRANSFER EQUATION HAO GAO AND HONGKAI ZHAO Abstract

Soatto, Stefano

28

Project: (version of January 28, 2009) Sparse tensor product methods for radiative transfer  

E-Print Network (OSTI)

simulating a dense gas at very high temperatures, energy transport by means of radiation has to be taken into account. However, as even the non-scattering stationary monochromatic radiative transfer equation s · x. Applying an adaptive sparse discretiza- tion to the radiative transfer equation [1] allows to significantly

Hiptmair, Ralf

29

E-Print Network 3.0 - analytical radiative-transfer solutions...  

NLE Websites -- All DOE Office Websites (Extended Search)

In Illumination Engineering Society... . Stephens. On the fundamental solution of the radiative transfer equation. Journal of Astrophysical Research... . A numerical solution to...

30

Radiative Transport Equation in Rotated Reference Frames  

E-Print Network (OSTI)

A novel method for solving the linear radiative transport equation (RTE) in a three-dimensional homogeneous medium is proposed and illustrated with numerical examples. The method can be used with an arbitrary phase function A(s,s') with the constraint that it depends only on the angle between the angular variables s and s'. This corresponds to spherically symmetric (on average) random medium constituents. Boundary conditions are considered in the slab and half-space geometries. The approach developed in this paper is spectral. It allows for the expansion of the solution to the RTE in terms of analytical functions of angular and spatial variables to relatively high orders. The coefficients of this expansion must be computed numerically. However, the computational complexity of this task is much smaller than in the standard method of spherical harmonics. The solutions obtained are especially convenient for solving inverse problems associated with radiative transfer.

George Panasyuk; John C. Schotland; Vadim A. Markel

2005-05-24T23:59:59.000Z

31

Modified Method of Characteristics for Transient Radiative Transfer  

E-Print Network (OSTI)

conditions. The radiative transport equation is a hyperbolicTo solve the radiative transport equation for collimated

Katika, Kamal M.; Pilon, Laurent

2006-01-01T23:59:59.000Z

32

Radiative Heat Transfer in Enhanced Hydrogen Outgassing of Glass  

E-Print Network (OSTI)

Kaviany and B.P. Singh, Radiative heat transfer in porousmedia, Advances in Heat Transfer, vol. 23, no. 23, pp. 133Thermal radiation heat transfer, Hemisphere Publishing Co. ,

Kitamura, Rei; Pilon, Laurent

2009-01-01T23:59:59.000Z

33

Posters Comparison of Stochastic Radiation Transfer Predictions  

NLE Websites -- All DOE Office Websites (Extended Search)

9 Posters Comparison of Stochastic Radiation Transfer Predictions with Multi-Filter Rotating Shadowband Radiometer Data N. Byrne and G. Ramanathan Science Applications...

34

Equivalent isotropic scattering formulation for transient short-pulse radiative transfer in anisotropic  

E-Print Network (OSTI)

of the transient short-pulse radiation transport through forward and backward anisotropic scattering planar media time-resolved transmittance.13­15 The complete transient radiative transfer equation has been conEquivalent isotropic scattering formulation for transient short-pulse radiative transfer

Guo, Zhixiong "James"

35

Radiative heat transfer between dielectric bodies  

E-Print Network (OSTI)

The recent development of a scanning thermal microscope (SThM) has led to measurements of radiative heat transfer between a heated sensor and a cooled sample down to the nanometer range. This allows for comparision of the known theoretical description of radiative heat transfer, which is based on fluctuating electrodynamics, with experiment. The theory itself is a macroscopic theory, which can be expected to break down at distances much smaller than 10-8m. Against this background it seems to be reasonable to revisit the known macroscopic theory of fluctuating electrodynamics and of radiative heat transfer.

Svend-Age Biehs

2011-03-16T23:59:59.000Z

36

Radiative transfer with partial coherence in optically thick plasmas Aix-Marseille Universite, CNRS, PIIM UMR 7345, F-13397 Marseille Cedex 20, France  

E-Print Network (OSTI)

approach to address radiative transfer prob- lems involves a transport equation of Boltzmann-type, referred to as "radiative transfer equation", accounting for radiation-matter interaction processes such as spon- taneous the use of a transport theory for photons unavoidable. Opac- ity models for radiative transfer are widely

Paris-Sud XI, Université de

37

A FAST MULTILEVEL ALGORITHM FOR THE SOLUTION OF NONLINEAR SYSTEMS OF CONDUCTIVERADIATIVE HEAT TRANSFER EQUATIONS IN TWO  

E-Print Network (OSTI)

#12; The isotropic, monoenergetic, radiative transport equation is [10], [25], [34], \\Omega \\Delta r r­ differential equations that model steady­state combined conductive­radiative heat transfer in two spaceA FAST MULTILEVEL ALGORITHM FOR THE SOLUTION OF NONLINEAR SYSTEMS OF CONDUCTIVE­RADIATIVE HEAT

38

TWO-DIMENSIONAL TRANSIENT RADIATIVE HEAT TRANSFER USING DISCRETE ORDINATES METHOD  

E-Print Network (OSTI)

transport is time-dependent radiative transfer equation. The solution of the hyperbolic transient radiative-pulsed laser radiation interaction and transport within biological tissues. INTRODUCTION With the advent of the short-pulsed laser with the duration of the order of femtoseconds, transient laser radiation transport

Guo, Zhixiong "James"

39

Radiative Heat Transfer between Neighboring Particles  

E-Print Network (OSTI)

The near-field interaction between two neighboring particles is known to produce enhanced radiative heat transfer. We advance in the understanding of this phenomenon by including the full electromagnetic particle response, heat exchange with the environment, and important radiative corrections both in the distance dependence of the fields and in the particle absorption coefficients. We find that crossed terms of electric and magnetic interactions dominate the transfer rate between gold and SiC particles, whereas radiative corrections reduce it by several orders of magnitude even at small separations. Radiation away from the dimer can be strongly suppressed or enhanced at low and high temperatures, respectively. These effects must be taken into account for an accurate description of radiative heat transfer in nanostructured environments.

Alejandro Manjavacas; F. Javier Garcia de Abajo

2012-01-26T23:59:59.000Z

40

A 3D radiative transfer framework: II. line transfer problems  

E-Print Network (OSTI)

Higher resolution telescopes as well as 3D numerical simulations will require the development of detailed 3D radiative transfer calculations. Building upon our previous work we extend our method to include both continuum and line transfer. We present a general method to calculate radiative transfer including scattering in the continuum as well as in lines in 3D static atmospheres. The scattering problem for line transfer is solved via means of an operator splitting (OS) technique. The formal solution is based on a long-characteristics method. The approximate $\\Lambda$ operator is constructed considering nearest neighbors {\\em exactly}. The code is parallelized over both wavelength and solid angle using the MPI library. We present the results of several test cases with different values of the thermalization parameter and two choices for the temperature structure. The results are directly compared to 1D spherical tests. With our current grid setup the interior resolution is much lower in 3D than in 1D, nevertheless the 3D results agree very well with the well-tested 1D calculations. We show that with relatively simple parallelization that the code scales to very large number of processors which is mandatory for practical applications. Advances in modern computers will make realistic 3D radiative transfer calculations possible in the near future. Our current code scales to very large numbers of processors, but requires larger memory per processor at high spatial resolution.

E. Baron; Peter H. Hauschildt

2007-03-16T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

Diffusion Approximation of Radiative Transfer Problems with Guillaume Bal \\Lambda Leonid Ryzhik y  

E-Print Network (OSTI)

Ryzhik y Abstract We derive the diffusion approximation of transport equations with discontinuities at interfaces. The transport equations model the energy density of acoustic waves. The waves are reflected in the high frequency regime by a radiative transfer equation. This model has been first proposed

Ryzhik, Lenya

42

Journal of Quantitative Spectroscopy & Radiative Transfer 109 (2008) 727740  

E-Print Network (OSTI)

solution of the Fokker­Planck equation. This equation gives a good approximation to the radiative transport of this method. r 2007 Elsevier Ltd. All rights reserved. Keywords: Radiative transport equation; Fokker tissues is governed by the theory of radiative transport [1]. The radiative transport equation takes

Kim, Arnold D.

43

PARALLEL COMPUTATIONS OF RADIATIVE HEAT TRANSFER USING THE DISCRETE ORDINATES METHOD  

E-Print Network (OSTI)

the radiative transport equation on parallel computers. Mathematical libraries developed by third parties the discrete ordi- nates method. They observed that the global nature of radiative transport resultedPARALLEL COMPUTATIONS OF RADIATIVE HEAT TRANSFER USING THE DISCRETE ORDINATES METHOD Gautham

Utah, University of

44

A RADIATION TRANSFER SOLVER FOR ATHENA USING SHORT CHARACTERISTICS  

SciTech Connect

We describe the implementation of a module for the Athena magnetohydrodynamics (MHD) code that solves the time-independent, multi-frequency radiative transfer (RT) equation on multidimensional Cartesian simulation domains, including scattering and non-local thermodynamic equilibrium (LTE) effects. The module is based on well known and well tested algorithms developed for modeling stellar atmospheres, including the method of short characteristics to solve the RT equation, accelerated Lambda iteration to handle scattering and non-LTE effects, and parallelization via domain decomposition. The module serves several purposes: it can be used to generate spectra and images, to compute a variable Eddington tensor (VET) for full radiation MHD simulations, and to calculate the heating and cooling source terms in the MHD equations in flows where radiation pressure is small compared with gas pressure. For the latter case, the module is combined with the standard MHD integrators using operator splitting: we describe this approach in detail, including a new constraint on the time step for stability due to radiation diffusion modes. Implementation of the VET method for radiation pressure dominated flows is described in a companion paper. We present results from a suite of test problems for both the RT solver itself and for dynamical problems that include radiative heating and cooling. These tests demonstrate that the radiative transfer solution is accurate and confirm that the operator split method is stable, convergent, and efficient for problems of interest. We demonstrate there is no need to adopt ad hoc assumptions of questionable accuracy to solve RT problems in concert with MHD: the computational cost for our general-purpose module for simple (e.g., LTE gray) problems can be comparable to or less than a single time step of Athena's MHD integrators, and only few times more expensive than that for more general (non-LTE) problems.

Davis, Shane W. [Canadian Institute for Theoretical Astrophysics, Toronto, ON M5S 3H4 (Canada); Stone, James M.; Jiang Yanfei [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)

2012-03-01T23:59:59.000Z

45

Self-consistent scattering theory for the radiative transport equation  

E-Print Network (OSTI)

Self-consistent scattering theory for the radiative transport equation Arnold D. Kim School by the radiative transport equation. We present a theory for the transport equation with an inhomogeneous.5850. 1. INTRODUCTION The radiative transport equation governs light propaga- tion in random media

Kim, Arnold D.

46

RADIATIVE HEAT TRANSFER WITH QUASI-MONTE CARLO METHODS  

E-Print Network (OSTI)

RADIATIVE HEAT TRANSFER WITH QUASI-MONTE CARLO METHODS A. Kersch1 W. Moroko2 A. Schuster1 1Siemens of Quasi-Monte Carlo to this problem. 1.1 Radiative Heat Transfer Reactors In the manufacturing of the problems which can be solved by such a simulation is high accuracy modeling of the radiative heat transfer

47

RADIATIVE HEAT TRANSFER WITH QUASIMONTE CARLO METHODS \\Lambda  

E-Print Network (OSTI)

RADIATIVE HEAT TRANSFER WITH QUASI­MONTE CARLO METHODS \\Lambda A. Kersch 1 W. Morokoff 2 A accuracy modeling of the radiative heat transfer from the heater to the wafer. Figure 1 shows the draft Carlo simulation is often used to solve radiative transfer problems where complex physical phenomena

48

Posters The Effects of Radiative Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

Posters The Effects of Radiative Transfer on Low-Level Cyclogenesis M. J. Leach and S. Raman Department of Marine, Earth and Atmospheric Sciences North Carolina State University Raleigh, North Carolina Introduction Many investigators have documented the role that thermodynamic forcing due to radiative flux divergence plays in the enhancement or generation of circulation. Most of these studies involve large-scale systems (e.g., Slingo et al. 1988), small-scale systems such as thunderstorms (Chen and Cotton 1988), and squall lines (Chin, submitted). The generation of circulation on large scales results from the creation of divergence in the upper troposphere and the maintenance of low-level potentially unstable air, and the maintenance of baroclinicity throughout

49

Improvements to the SHDOM Radiative Transfer Modeling Package  

NLE Websites -- All DOE Office Websites (Extended Search)

to the SHDOM Radiative Transfer Modeling Package K. F. Evans University of Colorado Boulder, Colorado W. J. Wiscombe National Aeronautics and Space Administration...

50

Radiative heat transfer in a flow of rheologically complex fluid  

Science Journals Connector (OSTI)

The problem of complex radiative and convective heat transfer in steady-state generalized Couette flow of a nonlinear viscoplastic fluid is examined.

V. F. Volchenok; Z. P. Shul'man

1980-09-01T23:59:59.000Z

51

Complete radiative terms for the electron/electronic energy equation  

SciTech Connect

A derivation of the radiative terms in the electron/electronic energy equation is presented, properly accounting for the effects of absorption and emission of radiation on the individual energy modes of the gas. This electron/electronic energy equation with the complete radiative terms has successfully been used to model the radiation-dominated precursor ahead of the bow shock of a hypersonic vehicle entering the Earth`s atmosphere. 8 refs.

Stanley, S.A.; Carlson, L.A. [Univ of California, San Diego, CA (United States)

1994-10-01T23:59:59.000Z

52

Solving transient conduction and radiation heat transfer problems using the lattice Boltzmann method and the finite volume method  

SciTech Connect

The lattice Boltzmann method (LBM) was used to solve the energy equation of a transient conduction-radiation heat transfer problem. The finite volume method (FVM) was used to compute the radiative information. To study the compatibility of the LBM for the energy equation and the FVM for the radiative transfer equation, transient conduction and radiation heat transfer problems in 1-D planar and 2-D rectangular geometries were considered. In order to establish the suitability of the LBM, the energy equations of the two problems were also solved using the FVM of the computational fluid dynamics. The FVM used in the radiative heat transfer was employed to compute the radiative information required for the solution of the energy equation using the LBM or the FVM (of the CFD). To study the compatibility and suitability of the LBM for the solution of energy equation and the FVM for the radiative information, results were analyzed for the effects of various parameters such as the scattering albedo, the conduction-radiation parameter and the boundary emissivity. The results of the LBM-FVM combination were found to be in excellent agreement with the FVM-FVM combination. The number of iterations and CPU times in both the combinations were found comparable.

Mishra, Subhash C. [Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039 (India)]. E-mail: scm_iitg@yahoo.com; Roy, Hillol K. [Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039 (India)

2007-04-10T23:59:59.000Z

53

Journal of Quantitative Spectroscopy & Radiative Transfer 64 (2000) 255}273  

E-Print Network (OSTI)

s is the minimum of the total cross-section set, and consider the (vector) transport equation * * ( , )# ( , )" 1 2Journal of Quantitative Spectroscopy & Radiative Transfer 64 (2000) 255}273 A discrete-ordinates solution for multigroup transport theory with upscattering C.E. Siewert Mathematics Department, North

Siewert, Charles E.

54

Heat Transfer by Radiation to Surfaces at Low Temperatures  

Science Journals Connector (OSTI)

...August 1948 research-article Heat Transfer by Radiation to Surfaces at Low...E. V. Truter A study of the transfer of heat between the walls of vacuum vessels...more efficient in diminishing the heat transfer than a highly polished surface...

1948-01-01T23:59:59.000Z

55

ht. 1. Han Mass 7h&r. Vol. 13, pp. 13494357. Pergamon Pra 1970. PhIed in Great Britain RADIATIVE TRANSFER IN A CONSERVATIVE  

E-Print Network (OSTI)

involving radiative transport and wall temperature slip in a finite, absorbing, emitting gray medium, equation of transfer then equation (4) reduces to the simpler form where Z(z,Zl)is the radiation intensity, Zlis the In their work on radiative transport and wall direction cosine (as measured from the positive

Siewert, Charles E.

56

Enhanced radiative heat transfer between nanostructured gold plates  

E-Print Network (OSTI)

We compute the radiative heat transfer between nanostructured gold plates in the framework of the scattering theory. We predict an enhancement of the heat transfer as we increase the depth of the corrugations while keeping the distance of closest approach fixed. We interpret this effect in terms of the evolution of plasmonic and guided modes as a function of the grating's geometry.

R. Gurout; J. Lussange; F. S. S. Rosa; J. -P. Hugonin; D. A. R. Dalvit; J. -J. Greffet; A. Lambrecht; S. Reynaud

2012-03-07T23:59:59.000Z

57

Radiative heat transfer in 2D Dirac materials  

E-Print Network (OSTI)

We compute the radiative heat transfer between two sheets of 2D Dirac materials, including topological Chern insulators and graphene. Neglecting spatial dispersion, we derive both numerically and analytically the short-distance asymptotics of the near-field heat transfer in these systems, and show that it scales as the inverse of the distance between the two sheets. We argue that this scaling law for the near-field heat transfer is generic for any two-dimensional systems.

Pablo Rodriguez-Lopez; Wang-Kong Tse; Diego A. R. Dalvit

2014-10-16T23:59:59.000Z

58

Modelling of Radiative Transfer in Light Sources  

E-Print Network (OSTI)

. . . . . . . . . . . . . . . 30 2.5.3 Temperature distribution . . . . . . . . . . . . . . . . . . . . . . . . . 32 2-X radiative transition that is responsible for the sulfur lamp's bright sun-like spectrum #12;Contents 1

Eindhoven, Technische Universiteit

59

14 Three-Dimensional Radiative Transfer in Vegetation Canopies  

E-Print Network (OSTI)

transport equa- tion. This equation has a very simple physical interpretation; it is a mathematical to correctly de- scribe the photon transport. Second, the radiation regime is substantially influenced, 1981, p. 144). This allows the transport equation to relate micro-scale properties of the medium

Myneni, Ranga B.

60

Small distance expansion for radiative heat transfer between curved objects  

E-Print Network (OSTI)

We develop a small distance expansion for the radiative heat transfer between gently curved objects, in terms of the ratio of distance to radius of curvature. A gradient expansion allows us to go beyond the lowest order proximity transfer approximation. The range of validity of such expansion depends on temperature as well as material properties. Generally, the expansion converges faster for the derivative of the transfer than for the transfer itself, which we use by introducing a near-field adjusted plot. For the case of a sphere and a plate, the logarithmic correction to the leading term has a very small prefactor for all materials investigated.

Vladyslav A. Golyk; Matthias Krger; Alexander P. McCauley; Mehran Kardar

2012-10-12T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

Cross Validation of Satellite Radiation Transfer Models during SWERA  

Open Energy Info (EERE)

Cross Validation of Satellite Radiation Transfer Models during SWERA Cross Validation of Satellite Radiation Transfer Models during SWERA Project in Brazil Dataset Summary Description (Abstract): This work describes the cross validation between two different core radiation transfer models that will be applied during the SWERA (Solar and Wind Energy Assessment): the BRAZIL-SR, and the SUNY-Albany. The model cross validation was performed by using two reference sites in Brazil: at Caicó (06°28'01"S - 037°05'05"W,175.8 m), and Florianópolis (27°34'18"S - 048°31'42"W, 10 m), Satellite data were collected by INPE-CPTEC for GOES-8, that also provides for its quality assessment, sectoring, storing and distribution to the participating teams. In this work we show the first results of this cross-validation along with some discussions on model deviations

62

Singular eigenfunctions for the three-dimensional radiative transport equation  

E-Print Network (OSTI)

Case's method obtains solutions to the radiative transport equation as superpositions of elementary solutions when the specific intensity depends on one spatial variable. In this paper, we find elementary solutions when the specific intensity depends on three spatial variables in three-dimensional space. By using the reference frame whose z-axis lies in the direction of the wave vector, the angular part of each elementary solution becomes the singular eigenfunction for the one-dimensional radiative transport equation. Thus Case's method is generalized.

Manabu Machida

2013-09-07T23:59:59.000Z

63

Radiative transport limit for the random Schrdinger equation  

E-Print Network (OSTI)

We give a detailed mathematical analysis of the radiative transport limit for the average phase space density of solutions of the Schroedinger equation with time dependent random potential. Our derivation is based on the construction of an approximate martingale for the random Wigner distribution.

Guillaume Bal; George Papanicolaou; Leonid Ryzhik

2001-08-14T23:59:59.000Z

64

A mesoscopic description of radiative heat transfer at the nanoscale  

E-Print Network (OSTI)

We present a formulation of the nanoscale radiative heat transfer (RHT) using concepts of mesoscopic physics. We introduce the analog of the Sharvin conductance using the quantum of thermal conductance. The formalism provides a convenient framework to analyse the physics of RHT at the nanoscale. Finally, we propose a RHT experiment in the regime of quantized conductance.

Svend-Age Biehs; Emmanuel Rousseau; Jean-Jacques Greffet

2011-03-11T23:59:59.000Z

65

Radiative Transfer of Sound Waves in a Random Flow: Turbulent Scattering and ModeCoupling  

E-Print Network (OSTI)

systematically to derive the radiative transport equations that describe the evolution of acoustic correlation : : : : : : : : : : : : : : : : : : : : 8 3.2 The radiative transport equations : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 9 of the radiative transport equations 21 B Derivation of the diffusion equation without flow­straining 23 C

Ryzhik, Lenya

66

Application of Stochastic Radiative Transfer Theory to the ARM Cloud-Radiative Parameterization Problem  

SciTech Connect

This project had two primary goals: (1) development of stochastic radiative transfer as a parameterization that could be employed in an AGCM environment, and (2) exploration of the stochastic approach as a means for representing shortwave radiative transfer through mixed-phase layer clouds. To achieve these goals, climatology of cloud properties was developed at the ARM CART sites, an analysis of the performance of the stochastic approach was performed, a simple stochastic cloud-radiation parameterization for an AGCM was developed and tested, a statistical description of Arctic mixed phase clouds was developed and the appropriateness of stochastic approach for representing radiative transfer through mixed-phase clouds was assessed. Significant progress has been made in all of these areas and is detailed in the final report.

Dana E. Veron

2012-04-09T23:59:59.000Z

67

POLARIZED PARTIAL FREQUENCY REDISTRIBUTION IN SUBORDINATE LINES. II. SOLUTION OF THE TRANSFER EQUATION WITH RAYLEIGH SCATTERING  

SciTech Connect

It is quite common in line formation theory to treat scattering in subordinate lines under the assumption of complete frequency redistribution (CRD). The partial frequency redistribution (PRD) in subordinate lines cannot always be approximated by CRD, especially when the polarization state of the line radiation is taken into account. Here we investigate the PRD effects in subordinate lines including scattering polarization. The line formation is described by a polarized non-LTE line transfer equation based on a two-level atom model. We use the recently derived subordinate line redistribution matrix. We devise polarized approximate lambda iteration methods to solve the concerned transfer problem. The linear polarization profiles of subordinate lines formed in non-magnetic (Rayleigh) scattering atmospheres are discussed. We consider one-dimensional isothermal planar model atmospheres. We show that in the polarized line transfer calculations of subordinate lines, PRD plays as important of a role as it does in the case of resonance lines. We also study the effect of collisions on linear polarization profiles of subordinate lines.

Nagendra, K. N.; Sampoorna, M., E-mail: knn@iiap.res.in, E-mail: sampoorna@iiap.res.in [Indian Institute of Astrophysics, IInd Block, Koramangala, Bangalore 560 034 (India)

2012-09-20T23:59:59.000Z

68

Radiative heat transfer in 2D Dirac materials  

E-Print Network (OSTI)

We compute the radiative heat transfer between two sheets of 2D Dirac materials, including topological Chern insulators and graphene, within the framework of the local approximation for the optical response of these materials. In this approximation, which neglects spatial dispersion, we derive both numerically and analytically the short-distance asymptotic of the near-field heat transfer in these systems, and show that it scales as the inverse of the distance between the two sheets. Finally, we discuss the limitations to the validity of this scaling law imposed by spatial dispersion in 2D Dirac materials.

Pablo Rodriguez-Lopez; Wang-Kong Tse; Diego A. R. Dalvit

2015-02-02T23:59:59.000Z

69

Radiative heat transfer at nanoscale mediated by surface plasmons for highly doped Emmanuel Rousseau  

E-Print Network (OSTI)

Radiative heat transfer at nanoscale mediated by surface plasmons for highly doped silicon the role of surface plasmons for nanoscale radiative heat transfer between doped silicon surfaces. We derive a new accurate and closed-form expression of the radiative near- field heat transfer. We also

Paris-Sud XI, Université de

70

Calculating Radiative Heat Transfer in an Axisymmetric Closed Chamber: An Application  

E-Print Network (OSTI)

Calculating Radiative Heat Transfer in an Axisymmetric Closed Chamber: An Application to Crystal University of New York at Stony Brook Stony Brook N.Y. 11794 ABSTRACT Radiative heat transfer plays simulating radiative heat transfer in the crystal and in the region above the melt containing gas under

New York at Stoney Brook, State University of

71

CROSS VALIDATION OF SATELLITE RADIATION TRANSFER MODELS DURING SWERA PROJECT  

Open Energy Info (EERE)

ISES- 2003 ISES- 2003 CROSS VALIDATION OF SATELLITE RADIATION TRANSFER MODELS DURING SWERA PROJECT IN BRAZIL Enio B. Pereira, Fernando R. Martins 1 Brazilian Institute for Space Research - INPE, São José dos Campos, 12245-970, SP, Brazil Phone + 55 12 39456741, Fax + 55 12 39456810, enio@dge.inpe.br Samuel L. Abreu, Hans Georg Beyer, Sergio Colle, and Solar Energy Laboratory - LABSOLAR - Department of Mechanical Engineering, Federal University of Santa Catarina -UFSC, Florianopolis, 88040-900, (SC), Brazil, Richard Perez The University at Albany (SUNY), ASRC-CESTM, Albany, 12203 (NY), USA Abstract - This work describes the cross validation between two different core radiation transfer models that will be applied during the SWERA (Solar and Wind Energy Assessment): the BRAZIL-SR, and the

72

Heat transfer through a water spray curtain under the effect of a strong radiative source  

E-Print Network (OSTI)

Heat transfer through a water spray curtain under the effect of a strong radiative source P. Boulet - mail Pascal.Boulet@lemta.uhp-nancy.fr Keywords : heat transfer, radiative transfer, vaporization, convection, water spray Abstract Heat transfer inside a participating medium, made of droplets flowing in gas

Paris-Sud XI, Université de

73

HYDRODYNAMIC LIMITS FOR KINETIC EQUATIONS AND THE DIFFUSIVE APPROXIMATION OF RADIATIVE  

E-Print Network (OSTI)

HYDRODYNAMIC LIMITS FOR KINETIC EQUATIONS AND THE DIFFUSIVE APPROXIMATION OF RADIATIVE TRANSPORT . The radiative transport equations, satisfied by the Wigner function for random acoustic waves, present#usive approximation of the radiative transport equation. 1. Introduction We consider a class of kinetic models

Tzavaras, Athanasios E.

74

The radiative and combined mode heat transfer within the L-shaped nonhomogeneous and nongray participating media  

SciTech Connect

The solutions of pure radiative and combined radiative and conductive heat transfer within a L-shaped enclosure are presented. The enclosure contains a mixture of pulverized carbon particles, CO{sub 2}, and N{sub 2}. Three different types of problems are solved: homogeneous radiative properties, nonhomogeneous radiative properties, and combined conduction-radiation problem with nonhomogeneous radiative properties. To obtain solutions for these problems, the YIX method is used. The YIX quadrature uses piecewise constant interpolation of the integrands. To handle the L-shaped enclosure, an ad hoc approach of searching the struck surface node in the line-of-sight is developed. The general approach of handling any arbitrary complex geometry is briefly described. A single point, implicit, quasi-Newton scheme is used to solve the energy equation when both the radiation and conduction heat transfer modes are present. The quasi-Newton works well for a wide range of dimensionless conduction-radiation parameter except when the parameter is less than 0.2, i.e., radiation is the dominant heat transfer mode.

Hsu, P.F. [Florida Inst. of Tech., Melbourne, FL (United States). Mechanical and Aerospace Engineering Programs; Tan, Z. [Univ. of Texas, Austin, TX (United States). Aerospace Engineering and Engineering Mechanics Dept.

1996-11-01T23:59:59.000Z

75

Development of a GPU-based high-performance radiative transfer model for the Infrared Atmospheric Sounding Interferometer (IASI)  

SciTech Connect

Satellite-observed radiance is a nonlinear functional of surface properties and atmospheric temperature and absorbing gas profiles as described by the radiative transfer equation (RTE). In the era of hyperspectral sounders with thousands of high-resolution channels, the computation of the radiative transfer model becomes more time-consuming. The radiative transfer model performance in operational numerical weather prediction systems still limits the number of channels we can use in hyperspectral sounders to only a few hundreds. To take the full advantage of such high-resolution infrared observations, a computationally efficient radiative transfer model is needed to facilitate satellite data assimilation. In recent years the programmable commodity graphics processing unit (GPU) has evolved into a highly parallel, multi-threaded, many-core processor with tremendous computational speed and very high memory bandwidth. The radiative transfer model is very suitable for the GPU implementation to take advantage of the hardware's efficiency and parallelism where radiances of many channels can be calculated in parallel in GPUs. In this paper, we develop a GPU-based high-performance radiative transfer model for the Infrared Atmospheric Sounding Interferometer (IASI) launched in 2006 onboard the first European meteorological polar-orbiting satellites, METOP-A. Each IASI spectrum has 8461 spectral channels. The IASI radiative transfer model consists of three modules. The first module for computing the regression predictors takes less than 0.004% of CPU time, while the second module for transmittance computation and the third module for radiance computation take approximately 92.5% and 7.5%, respectively. Our GPU-based IASI radiative transfer model is developed to run on a low-cost personal supercomputer with four GPUs with total 960 compute cores, delivering near 4 TFlops theoretical peak performance. By massively parallelizing the second and third modules, we reached 364x speedup for 1 GPU and 1455x speedup for all 4 GPUs, both with respect to the original CPU-based single-threaded Fortran code with the -O{sub 2} compiling optimization. The significant 1455x speedup using a computer with four GPUs means that the proposed GPU-based high-performance forward model is able to compute one day's amount of 1,296,000 IASI spectra within nearly 10 min, whereas the original single CPU-based version will impractically take more than 10 days. This model runs over 80% of the theoretical memory bandwidth with asynchronous data transfer. A novel CPU-GPU pipeline implementation of the IASI radiative transfer model is proposed. The GPU-based high-performance IASI radiative transfer model is suitable for the assimilation of the IASI radiance observations into the operational numerical weather forecast model.

Huang Bormin, E-mail: bormin@ssec.wisc.ed [Space Science and Engineering Center, University of Wisconsin, Madison (United States); Mielikainen, Jarno [Department of Computer Science, University of Eastern Finland, Kuopio (Finland); Oh, Hyunjong; Allen Huang, Hung-Lung [Space Science and Engineering Center, University of Wisconsin, Madison (United States)

2011-03-20T23:59:59.000Z

76

Near-field radiative heat transfer for structured surfaces  

E-Print Network (OSTI)

We apply an analytical approach for determining the near-field radiative heat transfer between a metallic nanosphere and a planar semi-infinite medium with some given surface structure. This approach is based on a perturbative expansion, and evaluated to first order in the surface profile. With the help of numerical results obtained for some simple model geometries we discuss typical signatures that should be obtainable with a near-field scanning thermal microscope operated in either constant-height or constant-distance mode.

Svend-Age Biehs; Oliver Huth; Felix Rting

2011-03-15T23:59:59.000Z

77

12.815 Atmospheric Radiation, Fall 2005  

E-Print Network (OSTI)

Introduction to the physics of atmospheric radiation and remote sensing including use of computer codes. Radiative transfer equation including emission and scattering, spectroscopy, Mie theory, and numerical solutions. ...

Prinn, Ronald G.

78

HYDRODYNAMIC LIMITS FOR KINETIC EQUATIONS AND THE DIFFUSIVE APPROXIMATION OF RADIATIVE  

E-Print Network (OSTI)

HYDRODYNAMIC LIMITS FOR KINETIC EQUATIONS AND THE DIFFUSIVE APPROXIMATION OF RADIATIVE TRANSPORT of the radiative transport equation. 1. Introduction We consider a class of kinetic models equipped with a single. A general compactness frame- work is obtained for the diffusive scaling in L1 . The radiative transport

Tzavaras, Athanasios E.

79

Cloudy Sky RRTM Shortwave Radiative Transfer and Comparison to the Revised ECMWF Shortwave Model  

NLE Websites -- All DOE Office Websites (Extended Search)

Cloudy Sky RRTM Shortwave Radiative Transfer and Cloudy Sky RRTM Shortwave Radiative Transfer and Comparison to the Revised ECMWF Shortwave Model M. J. Iacono, J. S. Delamere, E. J. Mlawer, and S. A. Clough Atmospheric and Environmental Research, Inc. Lexington, Massachusetts J.-J. Morcrette European Centre for Medium-Range Weather Forecasts Reading, United Kingdom Introduction An important step toward improving radiative transfer codes in general circulation models (GCMs) is their thorough evaluation by comparison to measurements directly, or to other data-validated radiation models. This work extends the clear-sky shortwave (SW) GCM evaluation presented by Iacono et al. (2001) to computations including clouds. The rapid radiative transfer model (RRTM) SW radiation model accurately reproduces clear-sky direct beam fluxes from the Line-By-Line Radiative Transfer

80

Heat transfer in a radiating fluid with slug flow in a parallel-plate channel  

Science Journals Connector (OSTI)

As a step towards a better understanding of combined conduction, convection, and radiation, fully developed heat transfer in slug flow in a flat duct ... , nonblack, isothermal surfaces. The gray radiating fluid ...

R. Viskanta

1964-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

Method of Reducing the Error of Transferring the Size of a Unit of Laser Radiation Energy  

Science Journals Connector (OSTI)

A method is considered of reducing the error of transferring the size of a unit of laser radiation energy for a secondary standard of the units of average power and energy of laser radiation by using the readi...

A. N. Shchipunov

2002-10-01T23:59:59.000Z

82

3D Atmospheric Radiative Transfer for Cloud System-Resolving Models: Forward Modelling and Observations  

SciTech Connect

Utilization of cloud-resolving models and multi-dimensional radiative transfer models to investigate the importance of 3D radiation effects on the numerical simulation of cloud fields and their properties.

Howard Barker; Jason Cole

2012-05-17T23:59:59.000Z

83

Magnetic storm acceleration of radiation belt electrons observed by the Scintillating Fibre Detector (SFD) onboard EQUATOR-S  

E-Print Network (OSTI)

on the 500±67300 km, 4° inclination EQUATOR-S orbit show that the increase of the energetic electron ¯ux of electrons in the outer radiation belt has been attributed to Pc 5 band ULF waves excited by high speed solar wind ¯ow associated with magnetic storms (Rostoker et al., 1998). The main features

Paris-Sud XI, Université de

84

Theoretical and Numerical Analysis of Polarization for Time Dependent Radiative  

E-Print Network (OSTI)

transport equation with respect to the polariza- tion parameters solve the matrix-valued radiative transferTheoretical and Numerical Analysis of Polarization for Time Dependent Radiative Transfer Equations@math.stanford.edu Abstract We consider the matrix-valued radiative transfer equations for the Stokes param- eters

Bal, Guillaume

85

Retrieving leaf area index using a genetic algorithm with a canopy radiative transfer model  

E-Print Network (OSTI)

Retrieving leaf area index using a genetic algorithm with a canopy radiative transfer model quantities driving the algorithms used in regional and global biogeochemical, ecological and meteorological) and the inversion of a canopy radiative transfer (RT) model. In recent years, applications of the genetic algorithms

Liang, Shunlin

86

Radiative Heat Transfer Analysis of Fibrous Insulation Materials Using the ZonalGEF Method  

E-Print Network (OSTI)

Radiative Heat Transfer Analysis of Fibrous Insulation Materials Using the Zonal­GEF Method Walter to analyze radiative heat transfer in high porosity insulation materials which have a large scattering for LI900, a material used in the insulation tile for the space shuttle. Comparisons are presented

Yuen, Walter W.

87

Excitation transfer pathways in excitonic aggregates revealed by the stochastic Schrdinger equation  

E-Print Network (OSTI)

We derive the stochastic Schr\\"odinger equation for the system wave vector and use it to describe the excitation energy transfer dynamics in molecular aggregates. We suggest a quantum-measurement based method of estimating the excitation transfer time. Adequacy of the proposed approach is demonstrated by performing calculations on a model system. The theory is then applied to study the excitation transfer dynamics in a photosynthetic pigment-protein Fenna-Matthews-Olson (FMO) aggregate using both the Debye spectral density and the spectral density obtained from earlier molecular dynamics simulations containing strong vibrational high-frequency modes. The obtained results show that the excitation transfer times in the FMO system are affected by the presence of the vibrational modes, however the transfer pathways remain the same.

Vytautas Abramavicius; Darius Abramavicius

2014-01-14T23:59:59.000Z

88

Excitation transfer pathways in excitonic aggregates revealed by the stochastic Schr\\"odinger equation  

E-Print Network (OSTI)

We derive the stochastic Schr\\"odinger equation for the system wave vector and use it to describe the excitation energy transfer dynamics in molecular aggregates. We suggest a quantum-measurement based method of estimating the excitation transfer time. Adequacy of the proposed approach is demonstrated by performing calculations on a model system. The theory is then applied to study the excitation transfer dynamics in a photosynthetic pigment-protein Fenna-Matthews-Olson (FMO) aggregate using both the Debye spectral density and the spectral density obtained from earlier molecular dynamics simulations containing strong vibrational high-frequency modes. The obtained results show that the excitation transfer times in the FMO system are affected by the presence of the vibrational modes, however the transfer pathways remain the same.

Abramavicius, Vytautas

2014-01-01T23:59:59.000Z

89

Surface-Phonon Polariton Contribution to Nanoscale Radiative Heat Transfer. Emmanuel Rousseau  

E-Print Network (OSTI)

Surface-Phonon Polariton Contribution to Nanoscale Radiative Heat Transfer. Emmanuel Rousseau-sud Campus Polytechnique RD 128 91127 Palaiseau cedex, France Heat transfer between two plates of polar far-field value. In this article, we show that nanoscale heat transfer is dominated by the coupling

Paris-Sud XI, Université de

90

Satellite Data Assimilation in Numerical Weather Prediction Models. Part I: Forward Radiative Transfer and Jacobian Modeling in Cloudy Atmospheres  

Science Journals Connector (OSTI)

Satellite data assimilation requires rapid and accurate radiative transfer and radiance gradient models. For a vertically stratified scattering and emitting atmosphere, the vector discrete-ordinate radiative transfer model (VDISORT) was developed ...

Fuzhong Weng; Quanhua Liu

2003-11-01T23:59:59.000Z

91

Diffusion Approximation of Radiative Transfer Problems with Guillaume Bal \\Lambda Leonid Ryzhik y  

E-Print Network (OSTI)

propagation. The radiative transport equation for the evolution of the average phase space energy density a Ryzhik y September 16, 1998 Abstract We derive the diffusion approximation of transport equations with discontinuities at interfaces. The transport equations model the energy density of acoustic waves. The waves

Bal, Guillaume

92

An Update on Radiative Transfer Model Development at Atmospheric and Environmental Research, Inc.  

NLE Websites -- All DOE Office Websites (Extended Search)

Update on Radiative Transfer Model Development at Update on Radiative Transfer Model Development at Atmospheric and Environmental Research, Inc. J. S. Delamere, S. A. Clough, E. J. Mlawer, Sid-Ahmed Boukabara, K. Cady-Pereira, and M. Shepard Atmospheric and Environmental Research, Inc. Lexington, Maine Introduction Over the last decade, a suite of radiative transfer models has been developed at Atmospheric and Environmental Research, Inc. (AER) with support from the Atmospheric and Radiation Measurement (ARM) Program. These models span the full spectral regime from the microwave to the ultraviolet, and range from monochromatic to band calculations. Each model combines the latest spectroscopic advancements with radiative transfer algorithms to efficiently compute radiances, fluxes, and cooling

93

Graphene-assisted near-field radiative heat transfer between corrugated polar materials  

SciTech Connect

Graphene has attracted great attention in nanoelectronics, optics, and energy harvesting. Here, the near-field radiative heat transfer between graphene-covered corrugated silica is investigated based on the exact scattering theory. It is found that graphene can improve the radiative heat flux between silica gratings by more than one order of magnitude and alleviate the performance sensitivity to lateral shift. The underlying mechanism is mainly attributed to the improved photon tunneling of modes away from phonon resonances. Besides, coating with graphene leads to nonlocal radiative transfer that breaks Derjaguin's proximity approximation and enables corrugated silica to outperform bulk silica in near-field radiation.

Liu, X. L.; Zhang, Z. M., E-mail: zhuomin.zhang@me.gatech.edu [G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)

2014-06-23T23:59:59.000Z

94

Estimating Three-Dimensional Cloudy Radiative Transfer Effects from Time-Height Cross Sections  

NLE Websites -- All DOE Office Websites (Extended Search)

Estimating Three-Dimensional Cloudy Radiative Transfer Estimating Three-Dimensional Cloudy Radiative Transfer Effects from Time-Height Cross Sections C. Hannay and R. Pincus National Oceanic and Atmospheric Administration Climate Diagnostics Center Boulder, Colorado K. F. Evans Program in Atmospheric and Oceanic Sciences University of Colorado Boulder, Colorado Introduction Clouds in the atmosphere are finite in extent and variable in every direction and in time. Long data sets from ground-based profilers, such as lidars or cloud radars, could provide a very valuable set of observations to characterize this variability. We may ask how well such profiling instruments can represent the cloud structure as measured by the magnitude of the three-dimensional (3D) radiative transfer effect. The 3D radiative transfer effect is the difference between the domain average broadband solar surface

95

Near-field thermal radiation transfer controlled by plasmons in graphene  

E-Print Network (OSTI)

It is shown that thermally excited plasmon-polariton modes can strongly mediate, enhance, and tune the near-field radiation transfer between two closely separated graphene sheets. The dependence of near-field heat exchange ...

Ilic, Ognjen

96

Heat transfer during laminar fluid flow in a pipe with radiative heat removal  

Science Journals Connector (OSTI)

The heat-transfer problem is analyzed for laminar fluid flow in the initial section of a ... pipe having a parabolic entry velocity distribution and heat removal by radiation from the surface of...

Ya. S. Kadaner; Yu. P. Rassadkin; . L. Spektor

1971-01-01T23:59:59.000Z

97

Unsteady hydromagnetic free-convection flow with radiative heat transfer in a rotating fluid  

Science Journals Connector (OSTI)

We consider the buoyancy-induced flow of an electrically-conducting fluid with radiative heat transfer past a vertical flat plate of infinite ... vary with temperature, that is a compressible fluid. If the temper...

A. R. Bestman; S. K. Adjepong

98

Numerical simulation of three-dimensional combined convective radiative heat transfer in rectangular channels  

E-Print Network (OSTI)

This dissertation presents a numerical simulation of three-dimensional flow and heat transfer in a channel with a backward-facing step. Flow was considered to be steady, incompressible, and laminar. The flow medium was treated to be radiatively...

Ko, Min Seok

2009-05-15T23:59:59.000Z

99

Experimental Measurement of Radiation Heat Transfer from Complex Fenestration Systems.  

E-Print Network (OSTI)

??A well instrumented facility for the measurement of heat transfer from complex fenestration systems was built and validated. The facility provided very accurate measurements based (more)

Wilson, Barry Allan

2007-01-01T23:59:59.000Z

100

The multiple absorption coefficient zonal method (MACZM), an efficient computational approach for the analysis of radiative heat transfer in multidimensional inhomogeneous nongray media  

E-Print Network (OSTI)

of Radiative Heat Transfer, the P-3 Approximation, AIAAMedia, Journal of Heat Transfer, Vol. 109, No. 3 (1987),Media, Numerical Heat Transfer, Part B, Fundamentals, Vol.

Yuen, W W

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

Uniformly Accurate Diffusive Relaxation Schemes for Multiscale Transport Equations  

E-Print Network (OSTI)

, radiative transfer, and transport equations for waves in random media, have a diffusive scaling that leads #12; 1. Introduction Many transport equations, such as the neutron transport [CZ], radiative transferUniformly Accurate Diffusive Relaxation Schemes for Multiscale Transport Equations Shi JIN y

102

accelerated radiative transfer: Topics by E-print Network  

NLE Websites -- All DOE Office Websites (Extended Search)

Dominated Outflows Astrophysics (arXiv) Summary: Plasma outflows from gamma-ray bursts (GRB), pulsar winds, relativistic jets, and ultra-intense laser targets radiate...

103

Change in regime and transfer function models of global solar radiation in Kuwait  

Science Journals Connector (OSTI)

The development of the models for global solar radiation in Kuwait is based on removing the annual periodicity and seasonal variation. The first methodology used here is the change in regime technique that relies on dividing the observations into two ... Keywords: ARMA model, Harmonic analysis, Solar radiation, Transfer function

S. A. Al-Awadhi

2005-09-01T23:59:59.000Z

104

E-Print Network 3.0 - anisotropic k-shell radiation Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Summary: media. Specifically, we provide: (i) an anisotropic version of the radiative transport equation (RTE... scattering model in section 4. 3 Anisotropic Radiative Transfer The...

105

Journal of Quantitative Spectroscopy & Radiative Transfer 64 (2000) 219}226  

E-Print Network (OSTI)

of the discrete-ordinates approximation to the transport equation in plane geometry. The Green's function of papers [1}3] concerning radiation-transport problems in plane geometry, linear-algebra techniques were of the Fourier-component (m50) problems basic to the general azimuth-dependent transport equation [6], and since

Siewert, Charles E.

106

Some observations concerning the Tafel equation and its relevance to charge transfer in corrosion  

Science Journals Connector (OSTI)

Following some biographic notes about Tafel, his famous equation is discussed. Particular attention is given to the limitations of applicability of this equation, the distinction between the symmetry factor and the transfer coefficient, and the theoretical basis for the former. The possible dependence of the symmetry factor on potential and temperature are discussed, and some highly accurate experimental examples are shown. The mechanism of charge transfer in metal dissolution, which can be one of the elementary steps in corrosion, is discussed. It is argued that in this case, as well as in metal deposition, charge is transferred across the interface by ions rather than by electrons. This could have significant ramifications concerning the mechanism. It is proposed that the often observed difference between anodic and cathodic Tafel slopes could result from values of the symmetry factor that are far from 0.5, rather than from a stepwise mechanism that is commonly assumed. Assuming that charge is carried across the interface by ions rather than by electrons eliminates the need to postulate the formation of unstable intermediates.

E. Gileadi; E. Kirowa-Eisner

2005-01-01T23:59:59.000Z

107

Perturbation theory for the diffusion equation by use of the moments of the generalized  

E-Print Network (OSTI)

of the radiative transfer equation and the solution of the Fredholm equation of the second kind given a suitable solution of the radiative transfer equation for the calculation of the multiple integrals or on transport theory. While analyti- cal solutions of the diffusion equation (DE) are found in the literature

Fantini, Sergio

108

Conservative Moment Equations for Neutrino Radiation Transport with Limited Relativity  

E-Print Network (OSTI)

We derive conservative, multidimensional, energy-dependent moment equations for neutrino transport in core-collapse supernovae and related astrophysical systems, with particular attention to the consistency of conservative four-momentum and lepton number transport equations. After taking angular moments of conservative formulations of the general relativistic Boltzmann equation, we specialize to a conformally flat spacetime, which also serves as the basis for four further limits. Two of these---the multidimensional special relativistic case, and a conformally flat formulation of the spherically symmetric general relativistic case---are given in appendices for the sake of comparison with extant literature. The third limit is a weak-field, `pseudo-Newtonian' approach \\citep{kim_etal_2009,kim_etal_2012} in which the source of the gravitational potential includes the trace of the stress-energy tensor (rather than just the mass density), and all orders in fluid velocity $v$ are retained. Our primary interest here ...

Endeve, Eirik; Mezzacappa, Anthony

2012-01-01T23:59:59.000Z

109

Stochastic Radiative Transfer in Multilayer Broken Clouds. Part II: Validation Tests  

SciTech Connect

In the second part of our two-part paper we estimated the accuracy and robustness of the approximated equations for the mean radiance that were derived in Part I. In our analysis we used the three-dimensional (3D) cloud fields provided by (i) the stochastic Boolean model, (ii) large-eddy simulation model and (iii) satellite cloud retrieval. The accuracy of the obtained equations was evaluated by comparing the ensemble-averaged radiative properties that were obtained by the numerical averaging method (reference) and the analytical averaging method (approximation). The robustness of these equations was estimated by comparing the domain-averaged radiative properties obtained by using (i) the full 3D cloud structure (reference) and (ii) the bulk cloud statistics (approximation). It was shown that the approximated equations could provide reasonable accuracy ({approx}15%) for both the ensemble-averaged and domain-averaged radiative properties.

Kassianov, Evgueni I.; Ackerman, Thomas P.; Marchand, Roger T.; Ovtchinnikov, Mikhail

2003-04-01T23:59:59.000Z

110

Cross-Validation of SWERA's Core Radiative Transfer Models - Partial Report  

Open Energy Info (EERE)

Cross-Validation of SWERA's Core Radiative Transfer Models - Partial Report Cross-Validation of SWERA's Core Radiative Transfer Models - Partial Report Dataset Summary Description (Abstract): This partial report describes the results obtained by two of the core radiative transfer models adopted in the SWERA Project for global horizontal solar irradiation during the cross-validation step. They are BRASIL-SR and SUNY-ALBANY models (Martins, 2001; Stuhlmann et al. 1990; Perez et al., 2002). The results from other two other core models, NREL and DLR, are not yet available. The HELIOSAT was included as a reference model at this stage. The HELIOSAT model is widely employed for solar energy assessment in Europe and is well know by the solar energy community worldwide (Beyer et al., 1996; Cano et al., 1986). (Purpose): SWERA solar cross-validation study

111

Validation of the Poisson Stochastic Radiative Transfer Model Against Cloud Cascade Models  

NLE Websites -- All DOE Office Websites (Extended Search)

Poisson Stochastic Radiative Transfer Poisson Stochastic Radiative Transfer Model Against Cloud Cascade Models T. B. Zhuravleva Institute of Atmospheric Optics Tomsk, Russia A. Marshak National Aeronautics and Space Administration Goddard Space Flight Center Greenbelt, Maryland Background Starting from a very simple stochastic cloud model by Mullamaa et al. (1972), several different stochastic models have been developed to describe radiative transfer regime in single-layer broken clouds (Kargin 1984; Titov 1990; Malvagi and Pomraning 1992; Barker et al. 1992; Malvagi et al. 1993; Kargin and Prigarin 1994; Prigarin and Titov 1996; Marshak et al. 1998; Prigarin et al. 1998, 2001; Evans et al. 1999, 2001). Recently Kassianov (2003a) generalized the Titov's (1990) stochastic model

112

Radiative Transfer in Photocatalytic Systems Matteo Pasquali and Francesco Santarelli  

E-Print Network (OSTI)

; these components are usually anatase titanium dioxide, near-ultraviolet radiation, and oxygen, respectively as adsorption, chemical oxida- tion, and biodegradation) in that PCO can completely de- grade many classes of toxic organic compounds, forming only carbon dioxide and mineral acids, and it can achieve this within

Natelson, Douglas

113

Author's personal copy Radiative heat transfer in enhanced hydrogen  

E-Print Network (OSTI)

tube and heated in a furnace or by an incandescent lamp. It was observed that hydrogen release from the glass sample was faster and stronger when heated by an incandescent lamp than within a furnace. Here and the glass samples. In brief, the radiation emitted by the incandescent lamp is concentrated between 0

Pilon, Laurent

114

1 Copyright 2012 by ASME Proceedings of the ASME 2012 Summer Heat Transfer Conference  

E-Print Network (OSTI)

with biological media during biomedical laser therapeutic applications [1-6], involve the transport of radiative of radiative transfer, accurate solutions of the Equation of Radiative Transfer (ERT) are required. The ERT 8-12, 2012, Rio Grande, Puerto Rico HT2012-58307 NORMALIZATION FOR ULTRAFAST RADIATIVE TRANSFER

Guo, Zhixiong "James"

115

Assessment of Low Linear Energy Transfer RadiationInduced Bystander Mutagenesis in a Three-Dimensional Culture Model  

Science Journals Connector (OSTI)

...Department of Energy cleanup operations...mutation was a measurement of changes...with low-energy protons (28...Puck TT. Measurement of mutagenesis...on Radiation Units and Measurements; 1984. 23...low linear energy transfer radiation-induced...

Rudranath Persaud; Hongning Zhou; Sarah E. Baker; Tom K. Hei; and Eric J. Hall

2005-11-01T23:59:59.000Z

116

Development and Evaluation of RRTMG_SW, a Shortwave Radiative Transfer Model for GCM Applications  

NLE Websites -- All DOE Office Websites (Extended Search)

Development and Evaluation of RRTMG_SW, Development and Evaluation of RRTMG_SW, a Shortwave Radiative Transfer Model for General Circulation Model Applications M. J. Iacono, J. S. Delamere, E. J. Mlawer, and S. A. Clough Atmospheric and Environmental Research, Inc. Lexington, Massachusetts J.-J. Morcrette European Center for Medium-Range Weather Forecasts Reading, United Kingdom Y.-T. Hou National Centers for Environmental Prediction Camp Springs, Maryland Introduction The k-distribution shortwave radiation model developed for the Atmospheric Radiation Measurement (ARM) Program, RRTM_SW_V2.4 (Clough et al. 2004), utilizes the discrete ordinates radiative transfer model, DISORT, for scattering calculations and 16 g-points in each of its 16 spectral bands. DISORT provides agreement with line-by-line flux calculations to within 1 Wm

117

Data-driven modelling of shortwave radiation transfer to snow through boreal birch and conifer canopies  

E-Print Network (OSTI)

, Sweden, in spring 2011 and mixed conifer forest near Sodankylä, Finland, in spring 2012. Above models predict canopy shortwave transmission similarly well for leafless birch forest, but for conifersData-driven modelling of shortwave radiation transfer to snow through boreal birch and conifer

118

An Efficient Approach for Optical Radiative Transfer Tomography using the Spherical Harmonics Discrete Ordinates Method  

E-Print Network (OSTI)

This paper introduces a method to preform optical tomography, using 3D radiative transfer as the forward model. We use an iterative approach predicated on the Spherical Harmonics Discrete Ordinates Method (SHDOM) to solve the optimization problem in a scalable manner. We illustrate with an application in remote sensing of a cloudy atmosphere.

Levis, Aviad; Aides, Amit; Davis, Anthony B

2015-01-01T23:59:59.000Z

119

Impact of surface inhomogeneity on solar radiative transfer under overcast conditions  

E-Print Network (OSTI)

Impact of surface inhomogeneity on solar radiative transfer under overcast conditions Zhanqing Li1. Trishchenko Canada Centre for Remote Sensing, Ottawa, Ontario, Canada Received 20 June 2001; revised 26 to a method of estimating surface spectral areal-mean albedo from downwelling solar transmittance measurements

Li, Zhanqing

120

Human In vivo Dose-Response to Controlled, Low-Dose Low Linear Energy Transfer Ionizing Radiation Exposure  

Science Journals Connector (OSTI)

...biotinylated nucleotide analogue/ribonucleotide mix. The biotinylated cRNA targets were then...dose-response to controlled, low-dose low linear energy transfer ionizing radiation exposure. | The effect of low doses of low-linear energy transfer (photon) ionizing radiation...

Zelanna Goldberg; David M. Rocke; Chad Schwietert; Susanne R. Berglund; Alison Santana; Angela Jones; Jrg Lehmann; Robin Stern; Ruixiao Lu; and Christine Hartmann Siantar

2006-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

Use of eigenfunctions for solving radiation transfer in anisotropically scattering, plane?parallel media  

Science Journals Connector (OSTI)

Radiation transfer in an absorbing emitting gray anisotropicallyscattering plane?parallel medium is solved by using the naturally occurring eigenfunctions and expressions for the forward and backward radiation intensities the incident radiation and forward and backward radiation heat fluxes are presented. To illustrate the method of solution the situation involving an externally incident isotropic radiation at the boundary surfacex=0 and no energy sources in the medium is considered for the cases of four different scattering phase functions. It is shown that the convergence to the exact results is fast and that lower order approximations are accurate. In addition the present method of solution has an excellent potential for generalization to problems of plane?parallel media without azimuthal symmetry and to problems in cylindrical and spherical geometries.

S. T. Thynell; M. N. zi?ik

1986-01-01T23:59:59.000Z

122

Effect of electric field on heat transfer performance of automobile radiator at low frontal air velocity  

Science Journals Connector (OSTI)

The effect of electric field on the performance of automobile radiator is investigated in this work. In this experiment, a louvered fin and flat tube automobile radiator was mounted in a wind tunnel and there was heat exchange between a hot water stream circulating inside the tube and a cold air stream flowing through the external surface. The electric field was supplied on the airside of the heat exchanger and its supply voltage was adjusted from 0kV to 12kV. From the experiment, it was found that the unit with electric field pronounced better heat transfer rate, especially at low frontal velocity of air. The correlations for predicting the air-side heat transfer coefficient of the automobile radiator, with and without electric field, at low frontal air velocity were also developed and the predicted results agreed very well with the experimental data.

S. Vithayasai; T. Kiatsiriroat; A. Nuntaphan

2006-01-01T23:59:59.000Z

123

Human In vivo Dose-Response to Controlled, Low-Dose Low Linear Energy Transfer Ionizing Radiation Exposure  

Science Journals Connector (OSTI)

...effects of low-dose low-linear energy transfer ionizing radiation (LDIR) in humans...direct evidence that doses in the range of 1 to 10 cGy...the intentional radiation of healthy tissue...the response to ionizing radiation. Attempts...

Zelanna Goldberg; David M. Rocke; Chad Schwietert; Susanne R. Berglund; Alison Santana; Angela Jones; Jrg Lehmann; Robin Stern; Ruixiao Lu; and Christine Hartmann Siantar

2006-06-15T23:59:59.000Z

124

Including radiative heat transfer and reaction quenching in modeling a Claus plant waste heat boiler  

SciTech Connect

Due to increasingly stringent sulfur emission regulations, improvements are necessary in the modified Claus process. A recently proposed model by Nasato et al. for the Claus plant waste heat boiler (WHB) is improved by including radiative heat transfer, which yields significant changes in the predicted heat flux and the temperature profile along the WHB tube, leading to a faster quenching of chemical reactions. For the WHB considered, radiation accounts for approximately 20% of the heat transferred by convection alone. More importantly, operating the WHB at a higher gas mass flux is shown to enhance reaction quenching, resulting in a doubling of the predicted hydrogen flow rate. This increase in hydrogen flow rate is sufficient to completely meet the hydrogen requirement of the H[sub 2]S recovery process considered, which would eliminate the need for a hydrogen plant.

Karan, K.; Mehrotra, A.K.; Behie, L.A. (Univ. of Calgary, Alberta (Canada). Dept. of Chemical and Petroleum Engineering)

1994-11-01T23:59:59.000Z

125

Clouds in the atmospheres of extrasolar planets. IV. On the scattering greenhouse effect of CO2 ice particles: Numerical radiative transfer studies  

E-Print Network (OSTI)

Owing to their wavelengths dependent absorption and scattering properties, clouds have a strong impact on the climate of planetary atmospheres. Especially, the potential greenhouse effect of CO2 ice clouds in the atmospheres of terrestrial extrasolar planets is of particular interest because it might influence the position and thus the extension of the outer boundary of the classic habitable zone around main sequence stars. We study the radiative effects of CO2 ice particles obtained by different numerical treatments to solve the radiative transfer equation. The comparison between the results of a high-order discrete ordinate method and simpler two-stream approaches reveals large deviations in terms of a potential scattering efficiency of the greenhouse effect. The two-stream methods overestimate the transmitted and reflected radiation, thereby yielding a higher scattering greenhouse effect. For the particular case of a cool M-type dwarf the CO2 ice particles show no strong effective scattering greenhouse eff...

Kitzmann, D; Rauer, H

2013-01-01T23:59:59.000Z

126

Thermal heat radiation, near-field energy density and near-field radiative heat transfer of coated materials  

E-Print Network (OSTI)

We investigate the thermal radiation and thermal near-field energy density of a metal-coated semi-infinite body for different substrates. We show that the surface polariton coupling within the metal coating leads to an enhancement of the TM-mode part of the thermal near-field energy density when a polar substrate is used. In this case the result obtained for a free standing metal film is retrieved. In contrast, in the case of a metal substrate there is no enhancement in the TM-mode part, as can also be explained within the framework of surface plasmon coupling within the coating. Finally, we discuss the influence of the enhanced thermal energy density on the near-field radiative heat transfer between a simple semi-infinite and a coated semi-infinite body for different material combinations.

Svend-Age Biehs

2011-03-15T23:59:59.000Z

127

Modeling heat conduction and radiation transport with the diffusion equation in  

NLE Websites -- All DOE Office Websites (Extended Search)

heat conduction and radiation transport with the diffusion equation in NIF ALE-AMR heat conduction and radiation transport with the diffusion equation in NIF ALE-AMR This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2010 J. Phys.: Conf. Ser. 244 022075 (http://iopscience.iop.org/1742-6596/244/2/022075) Download details: IP Address: 50.136.219.251 The article was downloaded on 18/04/2013 at 01:36 Please note that terms and conditions apply. View the table of contents for this issue, or go to the journal homepage for more Home Search Collections Journals About Contact us My IOPscience Modeling Heat Conduction and Radiation Transport with the Diffusion Equation in NIF ALE-AMR A.C. Fisher 1 , D.S. Bailey 1 , T.B. Kaiser 1 , B.T.N. Gunney 1 , N.D. Masters 1 , A.E. Koniges 2 , D.C. Eder 1 , R.W. Anderson 1 1: Lawrence Livermore National Laboratory,

128

Non-contact pumping of light emitters via non-radiative energy transfer  

DOE Patents (OSTI)

A light emitting device is disclosed including a primary light source having a defined emission photon energy output, and, a light emitting material situated near to said primary light source, said light emitting material having an absorption onset equal to or less in photon energy than the emission photon energy output of the primary light source whereby non-radiative energy transfer from said primary light source to said light emitting material can occur yielding light emission from said light emitting material.

Klimov, Victor I. (Los Alamos, NM); Achermann, Marc (Los Alamos, NM)

2010-01-05T23:59:59.000Z

129

Near-Field Radiative Heat Transfer between Metamaterials coated with Silicon Carbide Film  

E-Print Network (OSTI)

In this letter, we study the near-field radiative heat transfer between two metamaterial substrates coated with silicon carbide (SiC) thin films. It is known that metamaterials can enhance the near-field heat transfer over ordinary materials due to excitation of magnetic plasmons associated with s polarization, while strong surface phonon polariton exists for SiC.By careful tuning of the optical properties of metamaterial it is possible to excite electrical and magnetic resonance for the metamaterial and surface phonon polaritons for SiC at different spectral regions, resulting in the enhanced heat transfer. The effect of the SiC film thickness at different vacuum gaps is investigated. Results obtained from this study will be beneficial for application of thin film coatings for energy harvesting.

Basu, Soumyadipta; Wang, Liping

2014-01-01T23:59:59.000Z

130

Development and adaptation of conduction and radiation heat-transfer computer codes for the CFTL. [Core Flow Test Loop; RODCON; HOTTEL  

SciTech Connect

RODCON and HOTTEL are two computational methods used to calculate thermal and radiation heat transfer for the Core Flow Test Loop (CFTL) analysis efforts. RODCON was developed at ORNL to calculate the internal temperature distribution of the fuel rod simulator (FRS) for the CFTL. RODCON solves the time-dependent heat transfer equation in two-dimensional (R angle) cylindrical coordinates at an axial plane with user-specified radial material zones and time- and position-variant surface conditions at the FRS periphery. Symmetry of the FRS periphery boundary conditions is not necessary. The governing elliptic, partial differential heat equation is cast into a fully implicit, finite-difference form by approximating the derivatives with a forward-differencing scheme with variable mesh spacing. The heat conduction path is circumferentially complete, and the potential mathematical problem at the rod center can be effectively ignored. HOTTEL is a revision of an algorithm developed by C.B. Baxi at the General Atomic Company (GAC) to be used in calculating radiation heat transfer in a rod bundle enclosed in a hexagonal duct. HOTTEL uses geometric view factors, surface emissivities, and surface areas to calculate the gray-body or composite view factors in an enclosure having multiple reflections in a nonparticipating medium.

Conklin, J.C.

1981-08-01T23:59:59.000Z

131

Computational study of atmospheric transfer radiation on an equatorial tropical desert (La Tatacoa, Colombia)  

E-Print Network (OSTI)

Radiative transfer models explain and predict interaction between solar radiation and the different elements present in the atmosphere, which are responsible for energy attenuation. In Colombia there have been neither measurements nor studies of atmospheric components such as gases and aerosols that can cause turbidity and pollution. Therefore satellite images cannot be corrected radiometrically in a proper way. When a suitable atmospheric correction is carried out, loss of information is avoided, which may be useful for discriminating image land cover. In this work a computational model was used to find radiative atmospheric attenuation (300 1000nm wavelength region) on an equatorial tropical desert (La Tatacoa, Colombia) in order to conduct an adequate atmospheric correction.

Delgado-Correal, Camilo; Castao, Gabriel

2012-01-01T23:59:59.000Z

132

Monte Carlo solution methods in a moment-based scale-bridging algorithm for thermal radiative transfer problems: Comparison with Fleck and Cummings  

SciTech Connect

We have developed a moment-based scale-bridging algorithm for thermal radiative transfer problems. The algorithm takes the form of well-known nonlinear-diffusion acceleration which utilizes a low-order (LO) continuum problem to accelerate the solution of a high-order (HO) kinetic problem. The coupled nonlinear equations that form the LO problem are efficiently solved using a preconditioned Jacobian-free Newton-Krylov method. This work demonstrates the applicability of the scale-bridging algorithm with a Monte Carlo HO solver and reports the computational efficiency of the algorithm in comparison to the well-known Fleck-Cummings algorithm. (authors)

Park, H. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Densmore, J. D. [Bettis Atomic Power Laboratory, West Mifflin, PA 15122 (United States); Wollaber, A. B.; Knoll, D. A.; Rauenzahn, R. M. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)

2013-07-01T23:59:59.000Z

133

Heat transfer between parallel plates: An approach based on the linearized Boltzmann equation for a binary mixture of rigid-sphere gases  

E-Print Network (OSTI)

Heat transfer between parallel plates: An approach based on the linearized Boltzmann equation a concise and particularly accurate solution of the heat-transfer problem for a binary gas mixture confined.1063/1.2511039 I. INTRODUCTION The heat-transfer problem within the context of rarefied gas dynamics has been

Siewert, Charles E.

134

Boundary coupled dual-equation numerical simulation on mass transfer in the process of laser cladding  

Science Journals Connector (OSTI)

The coupled numerical simulation on fluid flow, heat transfer, and mass transfer in the process of laser cladding is undertaken on the basis of the continuum model. In the...

Huang, Yanlu; Yang, Yongqiang; Wei, Guoqiang; Shi, Wenqing; Li, Yibin

2008-01-01T23:59:59.000Z

135

A parametric study of shock jump chemistry, electron temperature, and radiative heat transfer models in hypersonic flows  

E-Print Network (OSTI)

A PARAMETRIC STUDY OF SHOCK JUMP CHEMISTRY, ELECTRON TEMPERATURE, AND RADIATIVE HEAT TRANSFER MODELS IN HYPERSONIC FLOWS A Thesis by ROBERT BRIAN GREENDYKE Submitted to the Graduate College of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE August 1988 Major Subject: Aerospace Engineering A PARAMETRIC STUDY OF SHOCK JUMP CHEMISTRY, ELECTRON TEMPERATURE, AND RADIATIVE HEAT TRANSFER MODELS IN HYPERSONIC FLOWS A Thesis by ROBERT BRIAN...

Greendyke, Robert Brian

2012-06-07T23:59:59.000Z

136

PHYSICAL REVIEW B 85, 155422 (2012) Near-field thermal radiation transfer controlled by plasmons in graphene  

E-Print Network (OSTI)

in graphene Ognjen Ilic,1,* Marinko Jablan,2 John D. Joannopoulos,1 Ivan Celanovic,3 Hrvoje Buljan,2 and Marin-field radiation transfer between two closely separated graphene sheets. The dependence of near-field heat exchange interband or intraband processes. We predict maximum transfer at low doping and for plasmons in two graphene

Soljaèiæ, Marin

137

A Monte Carlo synthetic-acceleration method for solving the thermal radiation diffusion equation  

SciTech Connect

We present a novel synthetic-acceleration-based Monte Carlo method for solving the equilibrium thermal radiation diffusion equation in three spatial dimensions. The algorithm performance is compared against traditional solution techniques using a Marshak benchmark problem and a more complex multiple material problem. Our results show that our Monte Carlo method is an effective solver for sparse matrix systems. For solutions converged to the same tolerance, it performs competitively with deterministic methods including preconditioned conjugate gradient and GMRES. We also discuss various aspects of preconditioning the method and its general applicability to broader classes of problems.

Evans, Thomas M., E-mail: evanstm@ornl.gov [Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, TN 37831 (United States); Mosher, Scott W., E-mail: moshersw@ornl.gov [Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, TN 37831 (United States); Slattery, Stuart R., E-mail: sslattery@wisc.edu [University of WisconsinMadison, 1500 Engineering Dr., Madison, WI 53716 (United States); Hamilton, Steven P., E-mail: hamiltonsp@ornl.gov [Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, TN 37831 (United States)

2014-02-01T23:59:59.000Z

138

Klein-Gordon equation and Hawking radiation in the dyon black hole with a cosmic string  

E-Print Network (OSTI)

Charged massive scalar particles are considered in the gravitational and electromagnetic field produced by a dyonic black hole with a cosmic string along the axis of symmetry. Exact solutions of both angular and radial parts of the covariant Klein-Gordon equation in this background are obtained, and are given in terms of the confluent Heun functions. We emphasize the role of the presence of the cosmic string in these solutions. From the radial solution, we obtain the exact wave solutions near the exterior horizon of the black hole, and discuss the Hawking radiation spectrum and the energy flux.

Vieira, H S; Silva, G V

2015-01-01T23:59:59.000Z

139

On the transfer of energy towards infinity in the theory of weak turbulence for the nonlinear Schrdinger equation  

E-Print Network (OSTI)

We study the mathematical properties of a kinetic equation which describes the long time behaviour of solutions to the weak turbulence equation associated to the cubic nonlinear Schr\\"odinger equation. In particular, we give a precise definition of weak solutions and prove global existence of solutions for all initial data with finite mass. We also prove that any nontrivial initial datum yields the instantaneous onset of a condensate, i.e. a Dirac mass at the origin for any positive time. Furthermore we show that the only stationary solutions with finite total measure are Dirac masses at the origin. We finally construct solutions with finite energy, which is transferred to infinity in a self-similar manner.

A. H. M. Kierkels; J. J. L. Velzquez

2014-10-08T23:59:59.000Z

140

Posters Radiation Singularities, Multiple Scattering  

NLE Websites -- All DOE Office Websites (Extended Search)

mean C 1 0.75 and Levy index 1.35 (as empirically observed) and apply to it the Radiative Transfer Equation in the perfect scattering case. We have analytical and numerical...

Note: This page contains sample records for the topic "radiative transfer equation" 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

Radiative heat transfer between two dielectric nanogratings in the scattering approach  

E-Print Network (OSTI)

We present a theoretical study of radiative heat transfer between dielectric nanogratings in the scattering approach. As a comparision with these exact results, we also evaluate the domain of validity of Derjaguin's Proximity Approximation (PA). We consider a system of two corrugated silica plates with various grating geometries, separation distances, and lateral displacement of the plates with respect to one another. Numerical computations show that while the PA is a good approximation for aligned gratings, it cannot be used when the gratings are laterally displaced. We illustrate this by a thermal modulator device for nanosystems based on such a displacement.

J. Lussange; R. Gurout; F. S. S. Rosa; J. -J. Greffet; A. Lambrecht; S. Reynaud

2012-06-01T23:59:59.000Z

142

Milagro Version 2 An Implicit Monte Carlo Code for Thermal Radiative Transfer: Capabilities, Development, and Usage  

SciTech Connect

We have released Version 2 of Milagro, an object-oriented, C++ code that performs radiative transfer using Fleck and Cummings' Implicit Monte Carlo method. Milagro, a part of the Jayenne program, is a stand-alone driver code used as a methods research vehicle and to verify its underlying classes. These underlying classes are used to construct Implicit Monte Carlo packages for external customers. Milagro-2 represents a design overhaul that allows better parallelism and extensibility. New features in Milagro-2 include verified momentum deposition, restart capability, graphics capability, exact energy conservation, and improved load balancing and parallel efficiency. A users' guide also describes how to configure, make, and run Milagro2.

T.J. Urbatsch; T.M. Evans

2006-02-15T23:59:59.000Z

143

A 3D radiative transfer framework: I. non-local operator splitting and continuum scattering problems  

E-Print Network (OSTI)

We describe a highly flexible framework to solve 3D radiation transfer problems in scattering dominated environments based on a long characteristics piece-wise parabolic formal solution and an operator splitting method. We find that the linear systems are efficiently solved with iterative solvers such as Gauss-Seidel and Jordan techniques. We use a sphere-in-a-box test model to compare the 3D results to 1D solutions in order to assess the accuracy of the method. We have implemented the method for static media, however, it can be used to solve problems in the Eulerian-frame for media with low velocity fields.

Peter H. Hauschildt; E. Baron

2006-01-09T23:59:59.000Z

144

Computation of Domain-Averaged Irradiance with a Simple Two-Stream Radiative Transfer Model Including Vertical Cloud Property Correlations  

NLE Websites -- All DOE Office Websites (Extended Search)

Computation of Domain-Averaged Irradiance Computation of Domain-Averaged Irradiance with a Simple Two-Stream Radiative Transfer Model Including Vertical Cloud Property Correlations S. Kato Center for Atmospheric Sciences Hampton University Hampton, Virginia Introduction Recent development of remote sensing instruments by Atmospheric Radiation Measurement (ARM?) Program provides information of spatial and temporal variability of cloud structures. However it is not clear what cloud properties are required to express complicated cloud fields in a realistic way and how to use them in a relatively simple one-dimensional (1D) radiative transfer model to compute the domain averaged irradiance. To address this issue, a simple shortwave radiative transfer model that can treat the vertical cloud optical property correlation is developed. The model is based on the gamma-weighted

145

RADIATION HEAT TRANSFER ENVIRONMENT IN FIRE AND FURNACE TESTS OF RADIOACTIVE MATERIALS PAKCAGES  

SciTech Connect

The Hypothetical Accident Conditions (HAC) sequential test of radioactive materials packages includes a thermal test to confirm the ability of the package to withstand a transportation fire event. The test specified by the regulations (10 CFR 71) consists of a 30 minute, all engulfing, hydrocarbon fuel fire, with an average flame temperature of at least 800 C. The requirements specify an average emissivity for the fire of at least 0.9, which implies an essentially black radiation environment. Alternate test which provide equivalent total heat input at the 800 C time averaged environmental temperature may also be employed. When alternate tests methods are employed, such as furnace or gaseous fuel fires, the equivalence of the radiation environment may require justification. The effects of furnace and open confinement fire environments are compared with the regulatory fire environment, including the effects of gases resulting from decomposition of package overpack materials. The results indicate that furnace tests can produce the required radiation heat transfer environment, i.e., equivalent to the postulated pool fire. An open enclosure, with transparent (low emissivity) fire does not produce an equivalent radiation environment.

Smith, A

2008-12-31T23:59:59.000Z

146

The Escape of Ionizing Photons from OB Associations in Disk Galaxies Radiation Transfer Through Superbubbles  

E-Print Network (OSTI)

By solving the time-dependent radiation transfer problem of stellar radiation through evolving superbubbles within a smoothly varying H I distribution, we have estimated the fraction of ionizing photons emitted by OB associations that escapes the H I disk of our Galaxy. We considered a coeval star-formation history and a Gaussian star-formation history with a time spread sigma_t = 2 Myr. We find that the shells of the expanding superbubbles quickly trap or attenuate the ionizing flux, such that most of the escaping radiation escapes shortly after the formation of the superbubble. Superbubbles of large associations can blowout of the H I disk and form dynamic chimneys, which allow the ionizing radiation directly to escape the H I disk. However, blowout occurs when the ionizing photon luminosity has dropped well below the association's maximum luminosity. For the coeval star-formation history, the fraction of photons that escape each side of the disk in the solar vicinity is f_esc approx 6% (the total fraction ...

Dove, J B; Ferrara, A; Dove, James B.; Ferrara, Andrea

1999-01-01T23:59:59.000Z

147

Hybrid Characteristics: 3D radiative transfer for parallel adaptive mesh refinement hydrodynamics  

E-Print Network (OSTI)

We have developed a three-dimensional radiative transfer method designed specifically for use with parallel adaptive mesh refinement hydrodynamics codes. This new algorithm, which we call hybrid characteristics, introduces a novel form of ray tracing that can neither be classified as long, nor as short characteristics, but which applies the underlying principles, i.e. efficient execution through interpolation and parallelizability, of both. Primary applications of the hybrid characteristics method are radiation hydrodynamics problems that take into account the effects of photoionization and heating due to point sources of radiation. The method is implemented in the hydrodynamics package FLASH. The ionization, heating, and cooling processes are modelled using the DORIC ionization package. Upon comparison with the long characteristics method, we find that our method calculates the column density with a similarly high accuracy and produces sharp and well defined shadows. We show the quality of the new algorithm in an application to the photoevaporation of multiple over-dense clumps. We present several test problems demonstrating the feasibility of our method for performing high resolution three-dimensional radiation hydrodynamics calculations that span a large range of scales. Initial performance tests show that the ray tracing part of our method takes less time to execute than other parts of the calculation (e.g. hydrodynamics and adaptive mesh refinement), and that a high degree of efficiency is obtained in parallel execution. Although the hybrid characteristics method is developed for problems involving photoionization due to point sources, the algorithm can be easily adapted to the case of more general radiation fields.

Erik-Jan Rijkhorst; Tomasz Plewa; Anshu Dubey; Garrelt Mellema

2005-05-10T23:59:59.000Z

148

Nonadiabatic electron transfer in the condensed phase, via semiclassical and Langevin equation approach  

E-Print Network (OSTI)

In this dissertation, we discuss two methods developed during my PhD study to simulate electron transfer systems. The first method, the semi-classical approximation, is derived from the stationary phase approximation to ...

Song, XiaoGeng, Ph. D. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

149

Hyperspectral Aquatic Radiative Transfer Modeling Using a High-Performance Cluster Computing-Based Approach  

SciTech Connect

Abstract For aquatic studies, radiative transfer (RT) modeling can be used to compute hyperspectral above-surface remote sensing reflectance that can be utilized for inverse model development. Inverse models can provide bathymetry and inherent-and bottom-optical property estimation. Because measured oceanic field/organic datasets are often spatio-temporally sparse, synthetic data generation is useful in yielding sufficiently large datasets for inversion model development; however, these forward-modeled data are computationally expensive and time-consuming to generate. This study establishes the magnitude of wall-clock-time savings achieved for performing large, aquatic RT batch-runs using parallel computing versus a sequential approach. Given 2,600 simulations and identical compute-node characteristics, sequential architecture required ~100 hours until termination, whereas a parallel approach required only ~2.5 hours (42 compute nodes) a 40x speed-up. Tools developed for this parallel execution are discussed.

Filippi, Anthony M [ORNL; Bhaduri, Budhendra L [ORNL; Naughton, III, Thomas J [ORNL; King, Amy L [ORNL; Scott, Stephen L [ORNL; Guneralp, Inci [Texas A& M University

2012-01-01T23:59:59.000Z

150

Hyperspectral Aquatic Radiative Transfer Modeling Using a High-Performance Cluster Computing Based Approach  

SciTech Connect

For aquatic studies, radiative transfer (RT) modeling can be used to compute hyperspectral above-surface remote sensing reflectance that can be utilized for inverse model development. Inverse models can provide bathymetry and inherent- and bottom-optical property estimation. Because measured oceanic field/organic datasets are often spatio-temporally sparse, synthetic data generation is useful in yielding sufficiently large datasets for inversion model development; however, these forward-modeled data are computationally expensive and time-consuming to generate. This study establishes the magnitude of wall-clock-time savings achieved for performing large, aquatic RT batch-runs using parallel computing versus a sequential approach. Given 2,600 simulations and identical compute-node characteristics, sequential architecture required {approx}100 hours until termination, whereas a parallel approach required only {approx}2.5 hours (42 compute nodes) - a 40x speed-up. Tools developed for this parallel execution are discussed.

Fillippi, Anthony [Texas A& M University; Bhaduri, Budhendra L [ORNL; Naughton, III, Thomas J [ORNL; King, Amy L [ORNL; Scott, Stephen L [ORNL; Guneralp, Inci [Texas A& M University

2012-01-01T23:59:59.000Z

151

Three-dimensional Continuum Radiative Transfer Images of a Molecular Cloud Core Evolution  

E-Print Network (OSTI)

We analyze a three-dimensional smoothed particle hydrodynamics simulation of an evolving and later collapsing pre-stellar core. Using a three-dimensional continuum radiative transfer program, we generate images at 7 micron, 15 micron, 175 micron, and 1.3 mm for different evolutionary times and viewing angles. We discuss the observability of the properties of pre-stellar cores for the different wavelengths. For examples of non-symmetric fragments, it is shown that, misleadingly, the density profiles derived from a one-dimensional analysis of the corresponding images are consistent with one-dimensional core evolution models. We conclude that one-dimensional modeling based on column density interpretation of images does not produce reliable structural information and that multidimensional modeling is required.

J. Steinacker; B. Lang; A. Burkert; A. Bacmann; Th. Henning

2004-10-12T23:59:59.000Z

152

On Existence of $L^1$-solutions for Coupled Boltzmann Transport Equation and Radiation Therapy Treatment Optimization  

E-Print Network (OSTI)

The paper considers a linear system of Boltzmann transport equations modelling the evolution of three species of particles, photons, electrons and positrons. The system is coupled because of the collision term (an integral operator). The model is intended especially for dose calculation (forward problem) in radiation therapy. We show under physically relevant assumptions that the system has a unique solution in appropriate ($L^1$-based) spaces and that the solution is non-negative when the data (internal source and inflow boundary source) is non-negative. In order to be self-contained as much as is practically possible, many (basic) results and proofs have been reproduced in the paper. Existence, uniqueness and non-negativity of solutions for the related time-dependent coupled system are also proven. Moreover, we deal with inverse radiation treatment planning problem (inverse problem) as an optimal control problem both for external and internal therapy (in general $L^p$-spaces). Especially, in the case $p=2$ ...

Tervo, Jouko

2014-01-01T23:59:59.000Z

153

Proceedings of the 8 International Symposium on Heat Transfer  

E-Print Network (OSTI)

, contributions from radiation can be determined via solution of the Equation of Radiative Transfer (ERT equation can lead to significant error, due to the short time-duration of the transport processes, Beijing, China ISHT8-07-05 MODELING OF ULTRAFAST LASER TRANSPORT AND APPLICATIONS Zhixiong Guo Rutgers

Guo, Zhixiong "James"

154

Self-averaging in time reversal for the parabolic wave equation Guillaume Bal George Papanicolaou y Leonid Ryzhik z  

E-Print Network (OSTI)

is the solution of a transport equation. 1 Introduction In time-reversal experiments a signal emitted, in the regimes of random geometrical optics and radiative transfer (transport), was studied in [2, 3]. We also in the radiative transfer regime using the parabolic wave equation, when the waves interact fully with the random

Bal, Guillaume

155

Collisional and radiative excitation transfers in Kr-Xe mixtures: Quenching of Kr  

Science Journals Connector (OSTI)

A detailed study of electronic energy transfers in Kr-Xe mixtures has been made using a 250-keV electron accelerator to excite Kr-Xe mixtures over a wide range of Kr-host-gas pressure and Xe-impurity concentrations. Kr pressure ranged from 25 to 900 Torr with Xe concentrations varying from 0.1% to 10% of Kr partial pressure. Emission spectra taken in the vacuum-ultraviolet (vuv) region indicate that energy is transferred efficiently from Kr to Xe, with radiation from the Xe(3P1) state becoming greatly enhanced as the Xe-impurity concentration is increased. Emission spectra from the vuv also show that the Xe(1P1) state is populated by absorption of photons emitted from the Kr2 * first continuum. Two-body quenching rates with Xe ground-state atoms have been found for the Kr(1P1) [kq(1165 )=1.2105 sec-1/Torr] and for the Kr(3P1) [kq(1236 )=9.5105 sec-1/Torr] resonance states. Time-resolved measurements have also been made on the Kr2 * first and second continua. These measurements show the Kr(3P1) state is the atomic precursor of the Kr2 * first continuum. The results obtained in the Kr2 * second continuum are rate limited by the decay of Kr(3P1) at large Xe-impurity concentrations.

Jerry D. Cook and P. K. Leichner

1985-01-01T23:59:59.000Z

156

Schur-decomposition for 3D matrix equations and its application in solving radiative discrete ordinates equations discretized by Chebyshev collocation spectral method  

SciTech Connect

The Schur-decomposition for three-dimensional matrix equations is developed and used to directly solve the radiative discrete ordinates equations which are discretized by Chebyshev collocation spectral method. Three methods, say, the spectral methods based on 2D and 3D matrix equation solvers individually, and the standard discrete ordinates method, are presented. The numerical results show the good accuracy of spectral method based on direct solvers. The CPU time cost comparisons against the resolutions between these three methods are made using MATLAB and FORTRAN 95 computer languages separately. The results show that the CPU time cost of Chebyshev collocation spectral method with 3D Schur-decomposition solver is the least, and almost only one thirtieth to one fiftieth CPU time is needed when using the spectral method with 3D Schur-decomposition solver compared with the standard discrete ordinates method.

Li Benwen [Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, P.O. Box 314, Shenyang, Liaoning 110004 (China)], E-mail: heatli@hotmail.com; Tian Shuai; Sun Yasong; Hu, Zhang-Mao [Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, P.O. Box 314, Shenyang, Liaoning 110004 (China)

2010-02-20T23:59:59.000Z

157

High-performance solution of hierarchical equations of motions for studying energy-transfer in light-harvesting complexes  

E-Print Network (OSTI)

Excitonic models of light-harvesting complexes, where the vibrational degrees of freedom are treated as a bath, are commonly used to describe the motion of the electronic excitation through a molecule. Recent experiments point toward the possibility of memory effects in this process and require to consider time non-local propagation techniques. The hierarchical equations of motion (HEOM) were proposed by Ishizaki and Fleming to describe the site-dependent reorganization dynamics of protein environments (J. Chem. Phys., 130, p. 234111, 2009), which plays a significant role in photosynthetic electronic energy transfer. HEOM are often used as a reference for other approximate methods, but have been implemented only for small systems due to their adverse computational scaling with the system size. Here, we show that HEOM are also solvable for larger systems, since the underlying algorithm is ideally suited for the usage of graphics processing units (GPU). The tremendous reduction in computational time due to the GPU allows us to perform a systematic study of the energy-transfer efficiency in the Fenna-Matthews-Olson (FMO) light-harvesting complex at physiological temperature under full consideration of memory-effects. We find that approximative methods differ qualitatively and quantitatively from the HEOM results and discuss the importance of finite temperature to achieve high energy-transfer efficiencies.

Christoph Kreisbeck; Tobias Kramer; Mirta Rodriguez; Birgit Hein

2010-12-20T23:59:59.000Z

158

Shock wave structure in astrophysical flows with account of photon transfer  

E-Print Network (OSTI)

For an accurate treatment of the shock wave propagation in high-energy astrophysical phenomena, such as supernova shock breakouts, gamma-ray bursts and accretion discs, a knowledge of radiative transfer plays a crucial role. In this paper we consider 1D special relativistic radiation hydrodynamics by solving the Boltzmann equation for radiative transfer. The structure of a radiative shock is calculated for a number of shock tube problems including strong shock waves, a relativistic and radiation dominated cases. Calculations are performed using an iterative technique which consistently solves the equations of relativistic hydrodynamics and relativistic comoving radiative transfer. Comparison of radiative transfer solutions with the Eddington approximation and the M1 closure is made. Qualitative analysis of moment equations for radiation is performed and conditions for the existence of jump discontinuity for non-relativistic case are investigated numerically.

Tolstov, Alexey; Nagataki, Shigehiro; Nomoto, Ken'ichi

2014-01-01T23:59:59.000Z

159

PARALLEL COMPUTATION OF THE BOLTZMANN TRANSPORT EQUATION FOR MICROSCALE HEAT  

E-Print Network (OSTI)

silicon ðSi? and silicon dioxide ðSiO2?. The equation of phonon radiative transport ðERPT?, in itsPARALLEL COMPUTATION OF THE BOLTZMANN TRANSPORT EQUATION FOR MICROSCALE HEAT TRANSFER fundamental Boltzmann transport equations have been reported [3, 7, 8]. This has consequently instigated a re

Miller, Richard S.

160

FURN3D: A computer code for radiative heat transfer in pulverized coal furnaces  

SciTech Connect

A computer code FURN3D has been developed for assessing the impact of burning different coals on heat absorption pattern in pulverized coal furnaces. The code is unique in its ability to conduct detailed spectral calculations of radiation transport in furnaces fully accounting for the size distributions of char, soot and ash particles, ash content, and ash composition. The code uses a hybrid technique of solving the three-dimensional radiation transport equation for absorbing, emitting and anisotropically scattering media. The technique achieves an optimal mix of computational speed and accuracy by combining the discrete ordinate method (S[sub 4]), modified differential approximation (MDA) and P, approximation in different range of optical thicknesses. The code uses spectroscopic data for estimating the absorption coefficients of participating gases C0[sub 2], H[sub 2]0 and CO. It invokes Mie theory for determining the extinction and scattering coefficients of combustion particulates. The optical constants of char, soot and ash are obtained from dispersion relations derived from reflectivity, transmissivity and extinction measurements. A control-volume formulation is adopted for determining the temperature field inside the furnace. A simple char burnout model is employed for estimating heat release and evolution of particle size distribution. The code is written in Fortran 77, has modular form, and is machine-independent. The computer memory required by the code depends upon the number of grid points specified and whether the transport calculations are performed on spectral or gray basis.

Ahluwalia, R.K.; Im, K.H.

1992-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

FURN3D: A computer code for radiative heat transfer in pulverized coal furnaces  

SciTech Connect

A computer code FURN3D has been developed for assessing the impact of burning different coals on heat absorption pattern in pulverized coal furnaces. The code is unique in its ability to conduct detailed spectral calculations of radiation transport in furnaces fully accounting for the size distributions of char, soot and ash particles, ash content, and ash composition. The code uses a hybrid technique of solving the three-dimensional radiation transport equation for absorbing, emitting and anisotropically scattering media. The technique achieves an optimal mix of computational speed and accuracy by combining the discrete ordinate method (S{sub 4}), modified differential approximation (MDA) and P, approximation in different range of optical thicknesses. The code uses spectroscopic data for estimating the absorption coefficients of participating gases C0{sub 2}, H{sub 2}0 and CO. It invokes Mie theory for determining the extinction and scattering coefficients of combustion particulates. The optical constants of char, soot and ash are obtained from dispersion relations derived from reflectivity, transmissivity and extinction measurements. A control-volume formulation is adopted for determining the temperature field inside the furnace. A simple char burnout model is employed for estimating heat release and evolution of particle size distribution. The code is written in Fortran 77, has modular form, and is machine-independent. The computer memory required by the code depends upon the number of grid points specified and whether the transport calculations are performed on spectral or gray basis.

Ahluwalia, R.K.; Im, K.H.

1992-08-01T23:59:59.000Z

162

Solutions of the equation of radiative transfer by matrix operator techniques  

E-Print Network (OSTI)

heric Sciences is used as a pattern of format. the radiance for anisotropic scattering. Some of these methods such as that of Herman et al (1971) appear to be applicable only for small optical thicknesses. Important results using matrix or doubling...

Catchings, Frances Eugenia King

1973-01-01T23:59:59.000Z

163

Spectrally enhancing near-field radiative heat transfer by exciting magnetic polariton in SiC gratings  

E-Print Network (OSTI)

In the present work, we theoretically demonstrate, for the first time, that near field radiative transport between 1D periodic grating microstructures separated by subwavelength vacuum gaps can be significantly enhanced by exciting magnetic resonance or polariton. Fluctuational electrodynamics that incorporates scattering matrix theory with rigorous coupled wave analysis is employed to exactly calculate the near field radiative heat flux between two SiC gratings. Besides the well known coupled surface phonon polaritons (SPhP), an additional spectral radiative heat flux peak, which is due to magnetic polariton, is found within the phonon absorption band of SiC. The mechanisms, behaviors and interplays between magnetic polariton, coupled SPhP, single interface SPhP, and Wood's anomaly in the near field radiative transport are elucidated in detail. The findings will open up a new way to control near field radiative heat transfer by magnetic resonance with micro or nanostructured metamaterials.

Yang, Yue

2015-01-01T23:59:59.000Z

164

The convergence of an explicit finite difference solution for transient heat transfer in solids with radiation at one boundary  

E-Print Network (OSTI)

at the Interior Point 'n ' 17 8 ? 01 Temperature Resp C 2'( C 1, Wi Constant Tempera x = L, and Havin Transfer to a He Degree Absolute Calculated With Modulus as Per S at x/L = 0. 0 onse th a ture g Ra at S Temp a Mr tabi of Hea at dian ink.... The Fourier equation for one? dimensional heat conduction in solids with constant physical properties is BT K 0 T Qe gC Q~x (3 ? 01) The net radiant heat transfer rate between two gray bodies A and B at absolute temperature T and T will be B according...

Patel, Bhagubhai Desaibhai

2012-06-07T23:59:59.000Z

165

High linear-energy-transfer radiation can overcome radioresistance of glioma stem-like cells to low linear-energy-transfer radiation  

Science Journals Connector (OSTI)

......irradiation, especially thermal neutron irradiation. Boron-10 (10B) releases alpha (4He) and 7Li particles through...14 Kobayashi T , Kanda K. Analytical calculation of boron-10 dosage in cell nucleus for neutron capture therapy. Radiat......

Yuki Hirota; Shin-Ichiro Masunaga; Natsuko Kondo; Shinji Kawabata; Hirokazu Hirakawa; Hirohiko Yajima; Akira Fujimori; Koji Ono; Toshihiko Kuroiwa; Shin-Ichi Miyatake

2014-01-01T23:59:59.000Z

166

Cosmological Radiative Transfer Codes Comparison Project I: The Static Density Field Tests  

E-Print Network (OSTI)

Radiative transfer simulations are now at the forefront of numerical astrophysics. They are becoming crucial for an increasing number of astrophysical and cosmological problems; at the same time their computational cost has come to the reach of currently available computational power. Further progress is retarded by the considerable number of different algorithms (including various flavours of ray-tracing and moment schemes) developed, which makes the selection of the most suitable technique for a given problem a non-trivial task. Assessing the validity ranges, accuracy and performances of these schemes is the main aim of this paper, for which we have compared 11 independent RT codes on 5 test problems: (0) basic physics, (1) isothermal H II region expansion and (2) H II region expansion with evolving temperature, (3) I-front trapping and shadowing by a dense clump, (4) multiple sources in a cosmological density field. The outputs of these tests have been compared and differences analyzed. The agreement between the various codes is satisfactory although not perfect. The main source of discrepancy appears to reside in the multi-frequency treatment approach, resulting in different thicknesses of the ionized-neutral transition regions and different temperature structure. The present results and tests represent the most complete benchmark available for the development of new codes and improvement of existing ones. To this aim all test inputs and outputs are made publicly available in digital form.

Ilian T. Iliev; Benedetta Ciardi; Marcelo A. Alvarez; Antonella Maselli; Andrea Ferrara; Nickolay Y. Gnedin; Garrelt Mellema; Taishi Nakamoto; Michael L. Norman; Alexei O. Razoumov; Erik-Jan Rijkhorst; Jelle Ritzerveld; Paul R. Shapiro; Hajime Susa; Masayuki Umemura; Daniel J. Whalen

2006-03-08T23:59:59.000Z

167

3D Hydrodynamic & Radiative Transfer Models of X-ray Emission from Colliding Wind Binaries  

E-Print Network (OSTI)

Colliding wind binaries (CWBs) are unique laboratories for X-ray astrophysics. The massive stars in these systems possess powerful stellar winds with speeds up to $\\sim$3000 km s$^{-1}$, and their collision leads to hot plasma (up to $\\sim10^8$K) that emit thermal X-rays (up to $\\sim$10 keV). Many X-ray telescopes have observed CWBs, including Suzaku, and our work aims to model these X-ray observations. We use 3D smoothed particle hydrodynamics (SPH) to model the wind-wind interaction, and then perform 3D radiative transfer to compute the emergent X-ray flux, which is folded through X-ray telescopes' response functions to compare directly with observations. In these proceedings, we present our models of Suzaku observations of the multi-year-period, highly eccentric systems $\\eta$ Carinae and WR 140. The models reproduce the observations well away from periastron passage, but only $\\eta$ Carinae's X-ray spectrum is reproduced at periastron; the WR 140 model produces too much flux during this more complicated p...

Russell, Christopher M P; Owocki, Stanley P; Corcoran, Michael F; Hamaguchi, Kenji; Sugawara, Yasuharu

2014-01-01T23:59:59.000Z

168

Canonical formalism, fundamental equation, and generalized thermomechanics for irreversible fluids with heat transfer  

Science Journals Connector (OSTI)

A Lagrangian with dissipative (e.g., Onsagers) potentials is constructed for the field description of irreversible heat-conducting fluids, off local equilibrium. Extremum conditions of action yield Clebsch representations of temperature, chemical potential, velocities, and generalized momenta, including a thermal momentum introduced recently [R. L. Selinger and F. R. S. Whitham, Proc. R. Soc. London, Ser. A 302, 1 (1968); S. Sieniutycz and R. S. Berry, Phys. Rev. A 40, 348 (1989)]. The basic question asked is To what extent may irreversibility, represented by a given form of the entropy source, influence the analytical form of the conservation laws for the energy and momentum? Nthers energy for a fluid with heat flow is obtained, which leads to a fundamental equation and extended Hamiltonian dynamics obeying the second law of thermodynamics. While in the case of the Onsager potentials this energy coincides numerically with the classical energy E, it contains an extra term (vanishing along the path) still contributing to an irreversible evolution. Components of the energy-momentum tensor preserve all terms regarded standardly as irreversible (heat, tangential stresses, etc.) generalized to the case when thermodynamics includes the state gradients and the so-called thermal phase, which we introduce here. This variable, the Lagrange multiplier of the entropy generation balance, is crucial for consistent treatment of irreversible processes via an action formalism. We conclude with the hypothesis that embedding the first and second laws in the context of the extremal behavior of action under irreversible conditions may imply accretion of an additional term to the classical energy.

Stanislaw Sieniutycz and R. Stephen Berry

1993-03-01T23:59:59.000Z

169

The effects of radiative transfer in maintaining the Indian summer monsoon  

SciTech Connect

Atmospheric radiative transfer is an important thermodynamic forcing for the Indian summer monsoon. The monsoon is a component of a larger scale circulation system the principal components of which are the Hadley cell and the Walker Circulation. The Hadley cell is a thermally direct circulation that transports heat toward the poles. In the northern hemispheric summer, the ascending branch of the Hadley cell moves northward, due to heating of the land masses. This ascending branch of the Hadley cell is referred to as the Intertropical Convergence Zone (ITCZ). The return branch of the Hadley cell is characterized by southwesterly surface winds. At the surface, the ITCZ is marked by convergence of southwesterly surface winds from the south and northeasterly surface winds from the north. As the ITCZ moves northward, the southern extent of the northerly surface winds also moves northward, and southerly surface winds from the south side of the ITCZ also move northward. The surface convergence at the ITCZ is a driving mechanism for the summer monsoon circulation. The northward drift of the Hadley cell in the northern summer ITCZ is the deep convection over the warm pool of water in the western tropical Pacific ocean, located at about 160E. The latent heating in the deep convection drives another direct circulation, known as the Walker Circulation. The upper branch of the Walker Circulation over south Asia is easterly winds created by the deep convection in the western tropical Pacific. Convective activity over the Indian peninsula interacts with the Walker Circulation, creating a jet structure over the western part of India and the eastern Arabian Sea. This structure is known as the Tropical Easterly Jet (TEJ). Secondary circulations associated with the Indian convection also help to maintain the baroclinicity, which is essential to the development of monsoon depression, the maintenance of the monsoon trough, and the circulation and hydrology of the region in general.

Leach, M.J.; Raman, S. [North Carolina State Univ., Raleigh, NC (United States)

1995-04-01T23:59:59.000Z

170

Simple radiative transfer model for relationships between canopy biomass and reflectance  

Science Journals Connector (OSTI)

A modified Kubelka-Munk model has been utilized to derive useful equations for the analysis of apparent canopy reflectance. Based on the solution to the model simple working equations...

Park, J K; Deering, D W

1982-01-01T23:59:59.000Z

171

Heat transfer of a micropolar fluid by the presence of radiation  

Science Journals Connector (OSTI)

An analysis of the steady flow of a micropolar fluid past an unmoving plate by the presence of radiation is considered. Numerical solution for temperature field has been derived and the effect of the radiation...

C. Perdikis; A. Raptis

1996-08-01T23:59:59.000Z

172

Heat and Mass Transfer in the MHD Flow of a Visco-elastic Fluid in a Rotating Porous Channel with Radiative Heat  

Science Journals Connector (OSTI)

This paper deals with heat and mass transfer in the magnetohydrodynamic flow of a visco-elastic fluid in a rotating porous channel with radiative heat. The flow phenomenon has been characterized by the fluid para...

M. Jena; M. Goswami; S. Biswal

2014-12-01T23:59:59.000Z

173

A Theoretical Study on the Spontaneous Radiation of Inertia-gravity Waves Using the Renormalization Group Method. Part II: Verification of the Theoretical Equations by Numerical Simulation  

Science Journals Connector (OSTI)

The renormalization group equations (RGEs) describing spontaneous inertia-gravity wave (GW) radiation from part of a balanced flow through a quasi-resonance that were derived in a companion paper by Yasuda et al. are validated through numerical ...

Yuki Yasuda; Kaoru Sato; Norihiko Sugimoto

174

A comparison of approximate models for radiation in gas turbines  

Science Journals Connector (OSTI)

Approximate equations for radiative heat transfer equations coupled to an equation for the temperature are stated and a comparative numerical study of the different approximations is given. The approximation methods considered here range from moment methods to simplified PN-approximations. Numerical experiments and comparisons in different space dimensions and for various physical situations are presented.

M. Frank; M. Seaid; A. Klar; R. Pinnau; G. Thommes; J. Janicka

2004-01-01T23:59:59.000Z

175

On a Generalized Boltzmann Equation for Non-Classical Particle Transport  

E-Print Network (OSTI)

equations. Diffusion asymptotics. Radiative transfer. Neutron transport. AMS Subject classification. 35Q99On a Generalized Boltzmann Equation for Non-Classical Particle Transport Martin Frank1 and Thierry of collisional transport equations is broken by the introduction of the memory terms. Key words. Transport

Goudon, Thierry

176

E-Print Network 3.0 - atmospheric radiative transfer Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

Earth and Atmospheric Sciences, Cornell University Collection: Geosciences 49 The Greenhouse Effect without Feedbacks Summary: Number microns10.016.7 7.14 T261K 12;Radiative...

177

Three-body radiative heat transfer and Casimir-Lifshitz force out of thermal equilibrium for arbitrary bodies  

E-Print Network (OSTI)

We study the Casimir-Lifshitz force and the radiative heat transfer in a system consisting of three bodies held at three independent temperatures and immersed in a thermal environment, the whole system being in a stationary configuration out of thermal equilibrium. The theory we develop is valid for arbitrary bodies, i.e. for any set of temperatures, dielectric and geometrical properties, and describes each body by means of its scattering operators. For the three-body system we provide a closed-form unified expression of the radiative heat transfer and of the Casimir-Lifshitz force (both in and out of thermal equilibrium). This expression is thus first applied to the case of three planar parallel slabs. In this context we discuss the non-additivity of the force at thermal equilibrium, as well as the equilibrium temperature of the intermediate slab as a function of its position between two external slabs having different temperatures. Finally, we consider the force acting on an atom inside a planar cavity. We show that, differently from the equilibrium configuration, the absence of thermal equilibrium admits one or more positions of minima for the atomic potential. While the corresponding atomic potential depths are very small for typical ground state atoms, they may become particularly relevant for Rydberg atoms, becoming a promising tool to produce an atomic trap.

Riccardo Messina; Mauro Antezza

2014-02-11T23:59:59.000Z

178

On radiative transfer in water spray curtains using the Discrete Ordinates Method  

E-Print Network (OSTI)

addressed in conditions similar to devices used in fire protection systems. The radiation propagation from solutions involved in fire protection systems. In this case, the expected aim is to protect given devices of the spray efficiency would be a useful tool for people concerned with fire protection. Our group is involved

Paris-Sud XI, Université de

179

Characterization of the solar light field within the ocean mesopelagic zone based on radiative transfer simulations  

E-Print Network (OSTI)

Characterization of the solar light field within the ocean mesopelagic zone based on radiative t The solar light field within the ocean from the sea surface to the bottom of the mesopelagic zone there is sufficient amount of solar light to support the process of photosynthesis, and below by the aphotic

Stramski, Dariusz

180

Kinetic Scheme for Solving the M1 Model of Radiative Transfer  

Science Journals Connector (OSTI)

......of the intensity, but not the energy density. Thus, FLD cannot evaluate...it takes account of only the energy density. Gonzalez, Audit, and Huynh (2007) proposed...radiation field is expressed by the energy density and the flux, i.e......

Yuji Kanno; Tetsuya Harada; Tomoyuki Hanawa

2013-08-25T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

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.

182

General Relativistic Radiative Transfer and GeneralRelativistic MHD Simulations of Accretion and Outflows of Black Holes  

SciTech Connect

We calculate the emission from relativistic flows in black hole systems using a fully general relativistic radiative transfer formulation, with flow structures obtained by general relativistic magneto-hydrodynamic simulations. We consider thermal free-free emission and thermal synchrotron emission. Bright filament-like features protrude (visually) from the accretion disk surface, which are enhancements of synchrotron emission where the magnetic field roughly aligns with the line-of-sight in the co-moving frame. The features move back and forth as the accretion flow evolves, but their visibility and morphology are robust. We propose that variations and drifts of the features produce certain X-ray quasi-periodic oscillations (QPOs) observed in black-hole X-ray binaries.

Fuerst, Steven V.; /KIPAC, Menlo Park; Mizuno, Yosuke; /USRA, Huntsville; Nishikawa, Ken-Ichi; /USRA, Huntsville /Alabama U., Huntsville; Wu, Kinwah; /Mullard Space Sci.

2007-01-05T23:59:59.000Z

183

Second-order discretization in space and time for radiation hydrodynamics  

SciTech Connect

We present a method for solving the equations of radiation hydrodynamics that is second-order accurate in space and time. This method combines the MUSCL-Hancock method for solving the Euler equations with the TR/BDF2 scheme in time for solving the equations of radiative transfer. We use an LDFEM to discretize the radiative transfer equations in space, which, though uncommon for radiation diffusion calculations, is a standard for radiation transport applications. We address the challenges inherent to using different spatial discretizations for the hydrodynamics and radiation and demonstrate how these may be overcome. We define our method for a 1-D model of compressible fluid dynamics coupled with grey radiation diffusion. Using the method of manufactured solutions, we show that the method is second-order accurate in space and time for both the equilibrium diffusion and streaming limit. (authors)

Edwards, J. D.; Morel, J. E. [Department of Nuclear Engineering, TAMU 3133, Texas A and M University, College Station, TX 77843 (United States); Lowrie, R. B. [Computational Physics Group CCS-2, M.S. D413, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)

2013-07-01T23:59:59.000Z

184

Simulation of Infrared Laser Heating of Silica Using Heat Conduction and Multifrequency Radiation Diffusion Equations Adapted for Homogeneous Refractive Lossy Media  

SciTech Connect

Localized, transient heating of materials using micro-scale, highly absorbing laser light has been used in many industries to anneal, melt and ablate material with high precision. Accurate modeling of the relative contributions of conductive, convective and radiative losses as a function of laser parameters is essential to optimizing micro-scale laser processing of materials. In bulk semi-transparent materials such as silicate glass melts, radiation transport is known to play a significantly larger role as the temperature increases. Conventionally, radiation is treated in the frequency-averaged diffusive limit (Rosseland approximation). However, the role and proper treatment of radiative processes under rapidly heated, high thermal gradient conditions, often created through laser-matter interactions, is at present not clear. Starting from the radiation transport equation for homogeneous, refractive lossy media, they derive the corresponding time-dependent multi-frequency diffusion equations. Zeroth and first moments of the transport equation couple the energy density, flux and pressure tensor. The system is closed by neglecting the temporal derivative of the flux and replacing the pressure tensor by its diagonal analogue. The radiation equations are coupled to a diffusion equation for the matter temperature. They are interested in modeling infrared laser heating of silica over sub-millimeter length scales, and at possibly rapid rates. Hence, in contrast to related work, they retain the temporal derivative of the radiation field. They derive boundary conditions at a planar air-silica interface taking account of reflectivities obtained from the Fresnel relations that include absorption. The effect of a temperature-dependent absorption index is explored through construction of a multi-phonon dielectric function that includes mode dispersion. The spectral dimension is discretized into a finite number of intervals yielding a system of multigroup diffusion equations. Simulations are presented. To demonstrate the bulk heat loss due to radiation and the effect of the radiation's temporal derivative, they model cooling of a silica slab, initially at 2500 K, for 10 s. Retaining the derivative enables correctly modeling the loss of photons initially present in the slab. Other simulations model irradiating silica discs (of approximately 5 mm radii and thickness) with a CO2 laser: {lambda} = 10.59 and 4.6 um, Gaussian profile, r{sub 0} = 0.5 mm for 1/e decay. By surrounding the disks in room-temperature air, they make use of the boundary conditions described above.

Shestakov, A I; Matthews, M J; Vignes, R M; Stolken, J S

2010-10-28T23:59:59.000Z

185

A CLASS OF PHYSICALLY MOTIVATED CLOSURES FOR RADIATION HYDRODYNAMICS  

SciTech Connect

Radiative transfer and radiation hydrodynamics use the relativistic Boltzmann equation to describe the kinetics of photons. It is difficult to solve the six-dimensional time-dependent transfer equation unless the problem is highly symmetric or in equilibrium. When the radiation field is smooth, it is natural to take angular moments of the transfer equation to reduce the degrees of freedom. However, low order moment equations contain terms that depend on higher order moments. To close the system of moment equations, approximations are made to truncate this hierarchy. Popular closures used in astrophysics include flux-limited diffusion and the M{sub 1} closure, which are rather ad hoc and do not necessarily capture the correct physics. In this paper, we propose a new class of closures for radiative transfer and radiation hydrodynamics. We start from a different perspective and highlight the consistency of a fully relativistic formalism. We present a generic framework to approximate radiative transfer based on relativistic Grad's moment method. We then derive a 14-field method that minimizes unphysical photon self-interaction.

Chan, Chi-kwan, E-mail: ckchan@cfa.harvard.edu [Institute for Theory and Computation, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2011-02-01T23:59:59.000Z

186

A high-spectral-resolution radiative transfer model for simulating multi-layered clouds and aerosols in the infrared spectral region  

Science Journals Connector (OSTI)

A fast and flexible model is developed to simulate the transfer of thermal infrared radiation at wavenumbers from 700 to 1300 cm?1 with a spectral resolution of 0.1 cm?1 for scattering/absorbing atmospheres. In a single run and at multiple user-...

Chenxi Wang; Ping Yang; Xu Liu

187

Astrophysical S factor for the radiative capture (12)N(p,gamma)(13)O determined from the (14)N((12)N,(13)O)(13)C proton transfer reaction  

E-Print Network (OSTI)

The cross section of the radiative proton capture reaction on the drip line nucleus (12)N was investigated using the asymptotic normalization coefficient (ANC) method. We have used the (14)N((12)N,(13)O)(13)C proton transfer reaction at 12 Me...

Banu, A.; Al-Abdullah, T.; Fu, C.; Gagliardi, Carl A.; McCleskey, M.; Mukhamedzhanov, A. M.; Tabacaru, G.; Trache, L.; Tribble, Robert E.; Zhai, Y.; Carstoiu, F.; Burjan, V.; Kroha, V.

2009-01-01T23:59:59.000Z

188

Frequency-Selective Near-Field Radiative Heat Transfer between Photonic Crystal Slabs: A Computational Approach for Arbitrary Geometries and Materials  

E-Print Network (OSTI)

of energy from a hot to a cold body is well known to be enhanced (even exceeding the black- body limit) whenFrequency-Selective Near-Field Radiative Heat Transfer between Photonic Crystal Slabs of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 3 Department

Soljaèiæ, Marin

189

Heat and moisture transfer through clothing  

E-Print Network (OSTI)

R. C. Eberhart (ed), Heat transfer in medicine and biology.Convective and radiative heat transfer coefficients forsimulation of heat and moisture transfer in a human-

Voelker, Conrad; Hoffmann, Sabine; Kornadt, Oliver; Arens, Edward; Zhang, Hui; Huizenga, Charlie

2009-01-01T23:59:59.000Z

190

Radiator Labs | Department of Energy  

NLE Websites -- All DOE Office Websites (Extended Search)

of steam buildings. Radiator Labs developed a mechanism that allows heating systems to control heat transfer at each radiator. The Radiator Labs design utilizes an...

191

Enhancing the heat transfer in a heat treatment furnace through improving the combustion process in the radiation tubes  

Science Journals Connector (OSTI)

......predicted and measured data. The CFD simulations...methods to improve the heat transfer rate and provide quantitative data which can be used...important in the combustion and the heat transfer processes...models on hydrogen-hydrocarbon combustion modelling......

E. M. Elmabrouk; Y. Wu

2012-02-01T23:59:59.000Z

192

Evaluation of Radiometric Measurements from the NASA Multiangle Imaging Spectroradiometer (MISR): Two- and Three-Dimensional Radiative Transfer Modeling of an Inhomogeneous Stratocumulus Cloud Deck  

SciTech Connect

In December 1999, NASA launched the Terra satellite. This platform carries five instruments that measure important properties of the Earth climate system. One of these instruments is the Multiangle Imaging Spectroradiometer, or MISR. This instrument measures light reflected from the Earth at a spatial resolution of 275-1100 m, at four wavelengths (446, 558, 672, and 866 nm), and at nine different viewing angles that vary from +70 to -70 degrees along the direction of flight [Diner et al., 2002]. These multiangle data have the potential to provide information on aerosols, surface, and cloud characteristics that compliments traditional single-view-direction satellite measurements. Before this potential can be realized, the accuracy of the satellite radiance measurements must be carefully assessed, and the implications of the radiometric accuracy on remote-sensing algorithms must be evaluated. In this article, we compare MISR multiangle measurements against two-dimensional (2-D) and 3-D radiative transfer calculations from an inhomogeneous cloud scene. Inputs to the radiative transfer code are based entirely on independently gathered data (ground-based radar, lidar, microwave radiometer, in situ aircraft data, etc.). The 2-D radiative transfer calculations compare favorably near nadir and in most of the forward scattering directions, but differ by as much as 10% in the backscattering directions. Using 3-D radiative transfer modeling, we show that this difference is due to the 3-D structure of the cloud deck, including variations in the cloud top height on scales less than 275 m, which are not resolved in the 2-D simulations. Comparison of the 2-D calculations to the MISR measurements, after accounting for the 3-D structure, show residual differences that are less than 4% at all angles at the MISR blue and green wavelengths. The comparison also reveals that the MISR measurements at the red and near-infrared wavelengths are too bright relative to measurements in the blue and green bands. On the basis of the results of this study, along with results from five other comparisons, the MISR calibration is being adjusted to reduce the red and nearinfrared Radiances.

Marchand, Roger T.; Ackerman, Thomas P.

2004-09-29T23:59:59.000Z

193

Excitational energy transfer enhancing ionization and spatial-temporal evolution of air breakdown with UV laser radiation  

E-Print Network (OSTI)

with UV laser radiation Jason S. Hummelta and John E. Scharer Department of Electrical and Computer of oxygen has on the ionization of nitrogen in laser air breakdown. Plasma is created by focusing a 193 nm ArF excimer laser using an 18 cm focal length lens, producing a cylindrical 540 m wide spot

Scharer, John E.

194

A lattice-Boltzmann relaxation scheme for coupled convection-radiation systems  

SciTech Connect

The convection-radiation effects in thermal fluid flows are studied based on the lattice-Boltzmann method. Nine-velocity flow and temperature distributions are used to obtain the mass, momentum and energy equations in thermal incompressible flows by studying equivalent moment systems. The radiative heat flux in the energy equation is obtained using the discrete-ordinates solution of the radiative transfer equation. A non-oscillatory relaxation scheme is used to solve the coupled moment equations. Such schemes have the advantage of being simple and easy to implement. Numerical results are presented for two test examples on coupled convection-radiation flows in two dimensional enclosures. Detailed simulation results at different flow and radiative regimes, as well as benchmark solutions, are presented and discussed.

Banda, Mapundi K. [School of Mathematical Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, 3209 Pietermaritzburg (South Africa)], E-mail: bandamk@ukzn.ac.za; Klar, Axel [AG Technomathematik, Fachbereich Mathematik, Technische Universitaet Kaiserslautern, 67663 Kaiserslautern (Germany)], E-mail: klar@itwm.fhg.de; Seaid, Mohammed [AG Technomathematik, Fachbereich Mathematik, Technische Universitaet Kaiserslautern, 67663 Kaiserslautern (Germany)], E-mail: seaid@mathematik.uni-kl.de

2007-10-01T23:59:59.000Z

195

Induction and Persistence of Large ?H2AX Foci by High Linear Energy Transfer Radiation in DNA-Dependent protein kinaseDeficient Cells  

SciTech Connect

Purpose: To evaluate the cell response to DNA double-strand breaks induced by low and high linear energy transfer (LET) radiations when the catalytic subunit of DNA-dependent protein kinase (DNA-PKcs), an essential protein of the nonhomologous end-joining repair pathway, lacks kinase activity. Methods and Materials: CHO10B2, a Chinese hamster ovary cell line, and its derived radiosensitive mutant cell line, irs-20, lacking DNA-PKcs activity, were evaluated after 0 to 3 Gy of ?-rays, plateau and Bragg peak protons, and lithium beams by clonogenic assay, and as a measurement of double-strand breaks, phosphorylated H2AX (?H2AX) foci number and size were quantified by immunocytofluorescence. Results: Irs-20 exhibited greater radiosensitivity and a higher amount of ?H2AX foci than CHO10B2 at 6 hours after irradiation for all types of radiations. Remarkably, CHO10B2 and irs-20 maintained their difference in radiosensitivity after high-LET radiation. Six hours after low-LET radiations, irs-20 did not reach basal levels of ?H2AX at high doses, whereas CHO10B2 recovered basal levels for all doses. After high-LET radiation, only CHO10B2 exhibited a reduction in ?H2AX foci, but it never reached basal levels. Persistent foci in irs-20 confirmed a repair deficiency. Interestingly, after 30 minutes of high-LET radiation both cell lines exhibited large foci (size >0.9 ?m{sup 2}) related to the damage nature, whereas at 6 hours irs-20 showed a higher amount of large foci than CHO10B2, with a 7-fold increase at 3 Gy, that could also be associated to radiosensitivity. Conclusions: We demonstrated, for the first time, an association between deficient DNA-PKcs activity and not only high levels of H2AX phosphorylation but also persistence and size increase of ?H2AX foci after high-LET irradiation.

Bracalente, Candelaria; Ibaez, Irene L. [Departamento de Micro y Nanotecnologa, Comisin Nacional de Energa Atmica, San Martn, Buenos Aires (Argentina); Consejo Nacional de Investigaciones Cientficas y Tcnicas, Buenos Aires (Argentina); Molinari, Beatriz [Departamento de Radiobiologa, Comisin Nacional de Energa Atmica, San Martn, Buenos Aires (Argentina); Consejo Nacional de Investigaciones Cientficas y Tcnicas, Buenos Aires (Argentina); Palmieri, Mnica [Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires (Argentina); Kreiner, Andrs [Consejo Nacional de Investigaciones Cientficas y Tcnicas, Buenos Aires (Argentina); Gerencia de Investigacin y Aplicaciones, Comisin Nacional de Energa Atmica, San Martn, Buenos Aires (Argentina); Escuela de Ciencia y Tecnologa, Universidad Nacional de San Martn, San Martn, Buenos Aires (Argentina); Valda, Alejandro [Escuela de Ciencia y Tecnologa, Universidad Nacional de San Martn, San Martn, Buenos Aires (Argentina); and others

2013-11-15T23:59:59.000Z

196

Using radiative transfer models to study the atmospheric water vapor content and to eliminate telluric lines from high-resolution optical spectra  

E-Print Network (OSTI)

The Radiative Transfer Model (RTM) and the retrieval algorithm, incorporated in the SCIATRAN 2.2 software package developed at the Institute of Remote Sensing/Institute of Enviromental Physics of Bremen University (Germany), allows to simulate, among other things, radiance/irradiance spectra in the 2400-24 000 {\\AA} range. In this work we present applications of RTM to two case studies. In the first case the RTM was used to simulate direct solar irradiance spectra, with different water vapor amounts, for the study of the water vapor content in the atmosphere above Sierra Nevada Observatory. Simulated spectra were compared with those measured with a spectrometer operating in the 8000-10 000 {\\AA} range. In the second case the RTM was used to generate telluric model spectra to subtract the atmospheric contribution and correct high-resolution stellar spectra from atmospheric water vapor and oxygen lines. The results of both studies are discussed.

Gardini, A; Prez, E; Quesada, J A; Funke, B

2012-01-01T23:59:59.000Z

197

Anisotropic radiation elds: causality and quantum statistics  

E-Print Network (OSTI)

radiation transport 5 2.1 Radiation transport equation . . . . . . . . . . . . . . . . . . 5 2.2 Closures The transport of radiation through a medium is described by the radiation transport equation for the radiative is used to describe anisotropic radiation. Because the two moment equations do not form a closed set

Honingh, Aline

198

A Green's function formalism of energy and momentum transfer in fluctuational electrodynamics  

E-Print Network (OSTI)

Radiative energy and momentum transfer due to fluctuations of electromagnetic fields arising due to temperature difference between objects is described in terms of the cross-spectral densities of the electromagnetic fields. We derive relations between thermal non-equilibrium contributions to energy and momentum transfer and surface integrals of tangential components of the dyadic Green's functions of the vector Helmholtz equation. The expressions derived here are applicable to objects of arbitrary shapes, dielectric functions, as well as magnetic permeabilities. For the case of radiative transfer, we derive expressions for the generalized transmissivity and generalized conductance that are shown to obey reciprocity and agree with theory of black body radiative transfer in the appropriate limit.

Arvind Narayanaswamy; Yi Zheng

2013-02-03T23:59:59.000Z

199

HEAT AND MOISTURE TRANSFER THROUGH CLOTHING  

E-Print Network (OSTI)

R. C. Eberhart (ed), Heat transfer in medicine and biology.Convective and radiative heat transfer coefficients forCheng, X. -Y. 2005. Heat and moisture transfer with sorption

Voelker, Conrad; Hoffmann, Sabine; Kornadt, Oliver; Arens, Edward; Zhang, Hui; Huizenga, Charlie

2009-01-01T23:59:59.000Z

200

Shielded cells transfer automation  

SciTech Connect

Nuclear waste from shielded cells is removed, packaged, and transferred manually in many nuclear facilities. Radiation exposure is absorbed by operators during these operations and limited only through procedural controls. Technological advances in automation using robotics have allowed a production waste removal operation to be automated to reduce radiation exposure. The robotic system bags waste containers out of glove box and transfers them to a shielded container. Operators control the system outside the system work area via television cameras. 9 figures.

Fisher, J J

1984-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" from the National Library of EnergyBeta (NLEBeta).
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201

Coupled forward-adjoint monte carlo simulations of radiative transport for the study of optical probe design in heterogeneous tissues  

E-Print Network (OSTI)

approximation to the radiative transport equation [3, 7, 15,form of the radiative transport equation (RTE) assumed to

Hayakawa, Carole K.; Spanier, Jerome; Venugopalan, Vasan

2007-01-01T23:59:59.000Z

202

On the influence of the companion star in Eta Carinae: 2D radiative transfer modeling of the ultraviolet and optical spectra  

E-Print Network (OSTI)

We present 2D radiative transfer modeling of the Eta Carinae binary system accounting for the presence of a wind-wind collision (WWC) cavity carved in the optically-thick wind of the primary star. By comparing synthetic line profiles with HST/STIS spectra obtained near apastron, we show that the WWC cavity has a strong influence on multi-wavelength diagnostics. This influence is regulated by the modification of the optical depth in the continuum and spectral lines. We find that H-alpha, H-beta, and Fe II lines are the most affected by the WWC cavity, since they form over a large volume of the primary wind. These spectral lines depend on latitude and azimuth since, according to the orientation of the cavity, different velocity regions of a spectral line are affected. For 2D models with orientation corresponding to orbital inclination angle 110deg < i < 140deg and longitude of periastron 210deg < omega < 330deg, the blueshifted and zero-velocity regions of the line profiles are the most affected. Th...

Groh, Jose H; Madura, Thomas I; Weigelt, Gerd

2012-01-01T23:59:59.000Z

203

Relativistic radiation magnetohydrodynamics in dynamical spacetimes: Numerical methods and tests  

SciTech Connect

Many systems of current interest in relativistic astrophysics require a knowledge of radiative transfer in a magnetized gas flowing in a strongly curved, dynamical spacetime. Such systems include coalescing compact binaries containing neutron stars or white dwarfs, disks around merging black holes, core-collapse supernovae, collapsars, and gamma-ray burst sources. To model these phenomena, all of which involve general relativity, radiation (photon and/or neutrino), and magnetohydrodynamics (MHD), we have developed a general relativistic code capable of evolving MHD fluids and radiation in dynamical spacetimes. Our code solves the coupled Einstein-Maxwell-MHD-radiation system of equations both in axisymmetry and in full 3+1 dimensions. We evolve the metric by integrating the BSSN (Baumgarte-Shapiro-Shibata-Nakamura) equations, and use a conservative, high-resolution shock-capturing scheme to evolve both the MHD and radiation moment equations. In this paper, we implement our scheme for optically thick gases and gray-body opacities. Our code gives accurate results in a suite of tests involving radiating shocks and nonlinear waves propagating in Minkowski spacetime. In addition, to test our code's ability to evolve the relativistic radiation-MHD equations in strong-field dynamical spacetimes, we study 'thermal Oppenheimer-Snyder collapse' to a black hole and find good agreement between analytic and numerical solutions.

Farris, Brian D.; Li, T.K.; Liu, Y.T.; Shapiro, Stuart L. [Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)

2008-07-15T23:59:59.000Z

204

5. Heat transfer Ron Zevenhoven  

E-Print Network (OSTI)

1/120 5. Heat transfer Ron Zevenhoven ?bo Akademi University Thermal and Flow Engineering / Värme Three heat transfer mechanisms Conduction Convection Radiation 2/120 Pic: B?88 ?bo Akademi University | Thermal and Flow Engineering | 20500 Turku | Finland #12;3/120 5.1 Conductive heat transfer ?bo Akademi

Zevenhoven, Ron

205

A Theoretical Study on the Spontaneous Radiation of Inertia-gravity Waves Using the Renormalization Group Method. Part I: Derivation of the Renormalization Group Equations  

Science Journals Connector (OSTI)

By using the renormalization group (RG) method, the interaction between balanced flows and Doppler-shifted inertia-gravity waves (GWs) is formulated for the hydrostatic Boussinesq equations on the f-plane. The derived time-evolution equations (RG ...

Yuki Yasuda; Kaoru Sato; Norihiko Sugimoto

206

EXPLICIT-IMPLICIT SCHEME FOR RELATIVISTIC RADIATION HYDRODYNAMICS  

SciTech Connect

We propose an explicit-implicit scheme for numerically solving special relativistic radiation hydrodynamic equations, which ensures a conservation of total energy and momentum (matter and radiation). In our scheme, zeroth and first moment equations of the radiation transfer equation are numerically solved without employing a flux-limited diffusion approximation. For an hyperbolic term, of which the timescale is the light crossing time when the flow velocity is comparable to the speed of light, is explicitly solved using an approximate Riemann solver. Source terms describing an exchange of energy and momentum between the matter and the radiation via the gas-radiation interaction are implicitly integrated using an iteration method. The implicit scheme allows us to relax the Courant-Friedrichs-Lewy condition in optically thick media, where heating/cooling and scattering timescales could be much shorter than the dynamical timescale. We show that our numerical code can pass test problems of one- and two-dimensional radiation energy transport, and one-dimensional radiation hydrodynamics. Our newly developed scheme could be useful for a number of relativistic astrophysical problems. We also discuss how to extend our explicit-implicit scheme to the relativistic radiation magnetohydrodynamics.

Takahashi, Hiroyuki R. [Center for Computational Astrophysics, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan)] [Center for Computational Astrophysics, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan); Ohsuga, Ken; Tomida, Kengo [Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan)] [Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan); Sekiguchi, Yuichiro [Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)] [Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan); Inoue, Tsuyoshi, E-mail: takahashi@cfca.jp [Department of Physics and Mathematics, Aoyama Gakuin University, Fuchinobe, Sagamihara 229-8558 (Japan)] [Department of Physics and Mathematics, Aoyama Gakuin University, Fuchinobe, Sagamihara 229-8558 (Japan)

2013-02-20T23:59:59.000Z

207

Eurotherm Seminar N81 Reactive Heat Transfer in Porous Media, Ecole des Mines d'Albi, France June 4-6, 2007 ET81-1 HEAT TRANSFER BY SIMULTANEOUS RADIATION-CONDUCTION  

E-Print Network (OSTI)

of a packed bed reactor for gasifying coal in mixed control using concentrated solar radiation is proposed], Taylor et al. [3], Belghit et al. [4]). A moving bed reactor, for gasifying coconut charcoal with CO2 the radiative exchange in the porous medium. Case's normal-mode expansion technique [6] is used to obtain

Boyer, Edmond

208

Generalized linear Boltzmann equations for particle transport in polycrystals  

E-Print Network (OSTI)

The linear Boltzmann equation describes the macroscopic transport of a gas of non-interacting point particles in low-density matter. It has wide-ranging applications, including neutron transport, radiative transfer, semiconductors and ocean wave scattering. Recent research shows that the equation fails in highly-correlated media, where the distribution of free path lengths is non-exponential. We investigate this phenomenon in the case of polycrystals whose typical grain size is comparable to the mean free path length. Our principal result is a new generalized linear Boltzmann equation that captures the long-range memory effects in this setting. A key feature is that the distribution of free path lengths has an exponential decay rate, as opposed to a power-law distribution observed in a single crystal.

Jens Marklof; Andreas Strmbergsson

2015-02-13T23:59:59.000Z

209

Internal Heat Transfer Coefficient Determination in a Packed Bed From the Transient Response Due to Solid Phase Induction Heating  

E-Print Network (OSTI)

equations governing fluid flow and heat transfer in porousParticle-to-Fluid Heat and Mass Transfer in Packed Beds,Systems, Experimental Heat Transfer, Fluid Mechanics and

Geb, David; Zhou, Feng; Catton, Ivan

2012-01-01T23:59:59.000Z

210

Proceedings of HT2009 2009 ASME Summer Heat Transfer Conference  

E-Print Network (OSTI)

Proceedings of HT2009 2009 ASME Summer Heat Transfer Conference July 19-23, 2009, San Francisco, CA, USA HT2009-88261 SIMULATION OF FOCUSED RADIATION PROPAGATION AND TRANSIENT HEAT TRANSFER IN TURBID-dependent radiation and conduction bio-heat transfer model. Ultrashort pulsed radiation transport in the cylindrical

Guo, Zhixiong "James"

211

A model of heat and moisture transfer through clothing integratedwith the UC Berkeley comfort model  

E-Print Network (OSTI)

M. Convective and radiative heat transfer coefficients forH, Katayama T. Convective heat transfer coefficients andequations, and the heat transfer effects of different

Fu, Ming; Yu, Tiefeng; Zhang, Hui; Arens, Edward; Weng, Wenguo; Yuan, Hongyong

2014-01-01T23:59:59.000Z

212

Technology Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

Technology Transfer Since 1974, the Federal Laboratory Consortium (FLC) Award for Excellence in Technology Transfer has recognized scientists and engineers at federal government...

213

Divergence form nonlinear nonsmooth parabolic equations with locally arbitrary growth conditions and nonlinear maximal regularity  

E-Print Network (OSTI)

This is a generalization of our prior work on the compact fixed point theory for the elliptic Rosseland-type equations. We obtain the maximum principle without the technical Steklov techniques. Inspired by the Rosseland equation in the conduction-radiation coupled heat transfer, we use the locally arbitrary growth conditions instead of the common global restricted growth conditions. Its physical meaning is: the absolute temperature should be positive and bounded. There exists a fixed point for the linearized map (compact and continuous in $L^2$) in a closed convex set. We also consider the nonlinear maximal regularity in Sobolev space.

Qiao-fu Zhang

2012-05-15T23:59:59.000Z

214

Quantitative photoacoustic imaging in radiative transport regime  

E-Print Network (OSTI)

, radiative transport equation, inverse transport problem, interior data, Born approximation, iterative is accurately modeled by the radiative transport equation which describes the distribution of photons . The radiative transport equation for photon density u(x, v) can then be written as [9, 11, 77]: v · u(x, v) + a

Ren, Kui

215

Transferring Data  

NLE Websites -- All DOE Office Websites (Extended Search)

Transferring Data Transferring Data to and from NERSC Yushu Yao 1 Tuesday, March 8, 2011 Overview 2 * Structure of NERSC Systems and Disks * Data Transfer Nodes * Transfer Data from/to NERSC - scp/sftp - bbcp - GridFTP * Sharing Data Within NERSC Tuesday, March 8, 2011 Systems and Disks 3 System Hopper Franklin Carver Euclid Data Transfer Node PDSF Global Home ($HOME) Global Scratch ($GSCRATCH) Project Directory Local Non-shared Scratch Data transfer nodes can access most of the disks, suggested for transferring data in/out NERSC Tuesday, March 8, 2011 Data Transfer Nodes * Two Servers Available Now: - dtn01.nersc.gov and dtn02.nersc.gov - Accessible by all NERSC users * Designed to Transfer Data: - High speed connection to HPSS and NGF (Global Home, Project, and Global Scratch) - High speed ethernet to wide area network

216

Differential Equations  

Science Journals Connector (OSTI)

Modelica is a powerful language for describing the ... mathematical equations. We begin our discussion of Modelica by showing how simple systems of differential equations can be expressed using Modelica. The expr...

Michael Tiller Ph.D.

2001-01-01T23:59:59.000Z

217

E-Print Network 3.0 - abscopal radiation effects Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

will introduce the theory of radiative transfer; the second part Summary: to greenhouse effect and solar radiation 6. Radiative heating and cooling a. The Chapman layer b....

218

CRASH: A BLOCK-ADAPTIVE-MESH CODE FOR RADIATIVE SHOCK HYDRODYNAMICS-IMPLEMENTATION AND VERIFICATION  

SciTech Connect

We describe the Center for Radiative Shock Hydrodynamics (CRASH) code, a block-adaptive-mesh code for multi-material radiation hydrodynamics. The implementation solves the radiation diffusion model with a gray or multi-group method and uses a flux-limited diffusion approximation to recover the free-streaming limit. Electrons and ions are allowed to have different temperatures and we include flux-limited electron heat conduction. The radiation hydrodynamic equations are solved in the Eulerian frame by means of a conservative finite-volume discretization in either one-, two-, or three-dimensional slab geometry or in two-dimensional cylindrical symmetry. An operator-split method is used to solve these equations in three substeps: (1) an explicit step of a shock-capturing hydrodynamic solver; (2) a linear advection of the radiation in frequency-logarithm space; and (3) an implicit solution of the stiff radiation diffusion, heat conduction, and energy exchange. We present a suite of verification test problems to demonstrate the accuracy and performance of the algorithms. The applications are for astrophysics and laboratory astrophysics. The CRASH code is an extension of the Block-Adaptive Tree Solarwind Roe Upwind Scheme (BATS-R-US) code with a new radiation transfer and heat conduction library and equation-of-state and multi-group opacity solvers. Both CRASH and BATS-R-US are part of the publicly available Space Weather Modeling Framework.

Van der Holst, B.; Toth, G.; Sokolov, I. V.; Myra, E. S.; Fryxell, B.; Drake, R. P. [Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI 48109 (United States); Powell, K. G. [Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109 (United States); Holloway, J. P. [Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109 (United States); Stout, Q. [Computer Science and Engineering, University of Michigan, Ann Arbor, MI 48109 (United States); Adams, M. L.; Morel, J. E. [Department of Nuclear Engineering, Texas A and M University, College Station, TX 77843 (United States); Karni, S. [Department of Mathematics, University of Michigan, Ann Arbor, MI 48109 (United States)

2011-06-01T23:59:59.000Z

219

CFD simulation of heat transfer enhancement of Al2O3/water and Al2O3/ethylene glycol nanofluids in a car radiator  

Science Journals Connector (OSTI)

Abstract The present numerical study simulated turbulent and laminar flow heat transfer in nanofluids (Al2O3 particles in water and ethylene glycol-based fluid) passing through a flat tube in 3D using computational fluid dynamics (CFD) for single and two-phase approaches. The advantages over pure base fluids were evaluated. Empirical correlations were used to calculate nanofluid viscosity and thermal conductivity as a function of the volumetric concentration of the nanoparticles. First, the Nusselt numbers of the pure water and pure ethylene glycol in flat tubes were compared with the experimental data. Next, the Nusselt numbers for both approaches were compared with those for experimental data at the same Reynolds number for different concentrations of nanoparticles. A small difference in the friction factors of the tube was observed between the two approaches and the Nusselt number for the two-phase model was markedly different from that for the single-phase model; however, the volumetric flow for the same heat transfer rate decreased and less pumping power was required for the nanofluids.

Vahid Delavari; Seyed Hassan Hashemabadi

2014-01-01T23:59:59.000Z

220

Enhanced heat transfer for thermionic power modules  

SciTech Connect

The thermionic power module is capable of operating at very high heat fluxes, which in turn serve to reduce capital costs. The most efficient operation also requires uniform heat fluxes. The development of enhanced heat transfer systems is required to meet the demand for high heat fluxes (>20 w/cm/sup 2/) at high temperatures (>1500K) which advanced thermionic power modules place upon combustion systems. Energy transfer from the hot combustion gases may take place by convection, radiation, or a combination of radiation and convection. Enhanced convective heat transfer with a jet impingement system has been demonstrated in a thermionic converter. The recently-developed cellular ceramic radiative heat transfer system has also been applied to a thermionic converter. By comparing the jet impingement and cellular ceramic radiative heat transfer systems, an appropriate system may be selected for utilization in advanced thermionic power modules. Results are reported.

Johnson, D.C.

1981-07-01T23:59:59.000Z

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221

ME 339 Heat Transfer ABET EC2000 syllabus  

E-Print Network (OSTI)

ME 339­ Heat Transfer Page 1 ABET EC2000 syllabus ME 339 ­ Heat Transfer Spring 2010 Required convection; radiation; introduction to phase change heat transfer and to heat exchangers. Prerequisite(s): ME, Fundamentals of Heat and Mass Transfer, 6th ed., Wiley Other Required Material: NA Course Objectives

Ben-Yakar, Adela

222

Three-dimensional CFD analysis for simulating the greenhouse effect in solar chimney power plants using a two-band radiation model  

Science Journals Connector (OSTI)

Abstract The greenhouse effect in the solar collector has a fundamental role to produce the upward buoyancy force in solar chimney power plant systems. This study underlines the importance of the greenhouse effect on the buoyancy-driven flow and heat transfer characteristics through the system. For this purpose, a three-dimensional unsteady model with the RNG k? turbulence closure was developed, using computational fluid dynamics techniques. In this model, to solve the radiative transfer equation the discrete ordinates (DO) radiation model was implemented, using a two-band radiation model. To simulate radiation effects from the sun's rays, the solar ray tracing algorithm was coupled to the calculation via a source term in the energy equation. Simulations were carried out for a system with the geometry parameters of the Manzanares power plant. The effects of the solar insolation and pressure drop across the turbine on the flow and heat transfer of the system were considered. Based on the numerical results, temperature profile of the ground surface, thermal collector efficiency and power output were calculated and the results were validated by comparing with experimental data of this prototype power plant. Furthermore, enthalpy rise through the collector and energy loss from the chimney outlet between 1-band and two-band radiation model were compared. The analysis showed that simulating the greenhouse effect has an important role to accurately predict the characteristics of the flow and heat transfer in solar chimney power plant systems.

Ehsan Gholamalizadeh; Man-Hoe Kim

2014-01-01T23:59:59.000Z

223

Efficient Phase-Change Materials: Development of a Low-Cost Thermal Energy Storage System Using Phase-Change Materials with Enhanced Radiation Heat Transfer  

SciTech Connect

HEATS Project: USF is developing low-cost, high-temperature phase-change materials (PCMs) for use in thermal energy storage systems. Heat storage materials are critical to the energy storage process. In solar thermal storage systems, heat can be stored in these materials during the day and released at nightwhen the sun is not outto drive a turbine and produce electricity. In nuclear storage systems, heat can be stored in these materials at night and released to produce electricity during daytime peak-demand hours. Most PCMs do not conduct heat very well. Using an innovative, electroless encapsulation technique, USF is enhancing the heat transfer capability of its PCMs. The inner walls of the capsules will be lined with a corrosion-resistant, high-infrared emissivity coating, and the absorptivity of the PCM will be controlled with the addition of nano-sized particles. USFs PCMs remain stable at temperatures from 600 to 1,000C and can be used for solar thermal power storage, nuclear thermal power storage, and other applications.

None

2011-12-05T23:59:59.000Z

224

AndreiG.Fedorov Title: George W. Woodruff Professorship in Heat Transfer, Combustion and  

E-Print Network (OSTI)

AndreiG.Fedorov Title: George W. Woodruff Professorship in Heat Transfer, Combustion and Energy Research Areas of Interest Heat Transfer, combustion, and energy systems Bioengineering, lab ionization and imaging for bioanalytical mass spectrometry Thermal radiation heat transfer Thermal

Garmestani, Hamid

225

Radiation Sources and Radioactive Materials (Connecticut)  

Energy.gov (U.S. Department of Energy (DOE))

These regulations apply to persons who receive, transfer, possess, manufacture, use, store, handle, transport or dispose of radioactive materials and/or sources of ionizing radiation. Some...

226

Radiating gravastars  

SciTech Connect

Considering a Vaidya exterior spacetime, we study dynamical models of prototype gravastars, made of an infinitely thin spherical shell of a perfect fluid with the equation of state p = ?, enclosing an interior de Sitter spacetime. We show explicitly that the final output can be a black hole, an unstable gravastar, a stable gravastar or a 'bounded excursion' gravastar, depending on how the mass of the shell evolves in time, the cosmological constant and the initial position of the dynamical shell. This work presents, for the first time in the literature, a gravastar that emits radiation.

Chan, R. [Coordenao de Astronomia e Astrofsica, Observatrio Nacional, Rua General Jos Cristino, 77, So Cristvo 20921-400, Rio de Janeiro, RJ (Brazil); Silva, M.F.A. da [Departamento de Fsica Terica, Instituto de Fsica, Universidade do Estado do Rio de Janeiro, Rua So Francisco Xavier 524, Maracan 20550-900, Rio de Janeiro - RJ (Brazil); Rocha, Jaime F. Villas da [Instituto de Biocincias, Departamento de Cincias Naturais, Universidade Federal do Estado do Rio de Janeiro, Av. Pasteur 458, Urca, CEP 22290-240, Rio de Janeiro, RJ (Brazil); Wang, Anzhong, E-mail: chan@on.br, E-mail: mfasnic@gmail.com, E-mail: jfvroch@pq.cnpq.br, E-mail: anzhong_wang@baylor.edu [GCAP-CASPER, Department of Physics, Baylor University, Waco, TX 76798 (United States)

2011-10-01T23:59:59.000Z

227

Curcumin Regulates Low-Linear Energy Transfer {gamma}-Radiation-Induced NF{kappa}B-Dependent Telomerase Activity in Human Neuroblastoma Cells  

SciTech Connect

Purpose: We recently reported that curcumin attenuates ionizing radiation (IR)-induced survival signaling and proliferation in human neuroblastoma cells. Also, in the endothelial system, we have demonstrated that NF{kappa}B regulates IR-induced telomerase activity (TA). Accordingly, we investigated the effect of curcumin in inhibiting IR-induced NF{kappa}B-dependent hTERT transcription, TA, and cell survival in neuroblastoma cells. Methods and Materials: SK-N-MC or SH-SY5Y cells exposed to IR and treated with curcumin (10-100 nM) with or without IR were harvested after 1 h through 24 h. NF{kappa}B-dependent regulation was investigated either by luciferase reporter assays using pNF{kappa}B-, pGL3-354-, pGL3-347-, or pUSE-I{kappa}B{alpha}-Luc, p50/p65, or RelA siRNA-transfected cells. NF{kappa}B activity was analyzed using an electrophoretic mobility shift assay and hTERT expression using the quantitative polymerase chain reaction. TA was determined using the telomerase repeat amplification protocol assay and cell survival using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltertrazolium bromide and clonogenic assay. Results: Curcumin profoundly inhibited IR-induced NF{kappa}B. Consequently, curcumin significantly inhibited IR-induced TA and hTERT mRNA at all points investigated. Furthermore, IR-induced TA is regulated at the transcriptional level by triggering telomerase reverse transcriptase (TERT) promoter activation. Moreover, NF{kappa}B becomes functionally activated after IR and mediates TA upregulation by binding to the {kappa}B-binding region in the promoter region of the TERT gene. Consistently, elimination of the NF{kappa}B-recognition site on the telomerase promoter or inhibition of NF{kappa}B by the I{kappa}B{alpha} mutant compromises IR-induced telomerase promoter activation. Significantly, curcumin inhibited IR-induced TERT transcription. Consequently, curcumin inhibited hTERT mRNA and TA in NF{kappa}B overexpressed cells. Furthermore, curcumin enhanced the IR-induced inhibition of cell survival. Conclusions: These results strongly suggest that curcumin inhibits IR-induced TA in an NF{kappa}B dependent manner in human neuroblastoma cells.

Aravindan, Natarajan, E-mail: naravind@ouhsc.ed [Department of Radiation Oncology, University of Oklahoma Health Sciences Center, Oklahoma City, OK (United States); Veeraraghavan, Jamunarani; Madhusoodhanan, Rakhesh; Herman, Terence S. [Department of Radiation Oncology, University of Oklahoma Health Sciences Center, Oklahoma City, OK (United States); Natarajan, Mohan [Department of Otolaryngology, Head and Neck Surgery, University of Texas Health Sciences Center at San Antonio, San Antonio, TX (United States)

2011-03-15T23:59:59.000Z

228

3D Continuum radiative transfer in complex dust configurations around young stellar objects and active nuclei II. 3D Structure of the dense molecular cloud core Rho Oph D  

E-Print Network (OSTI)

Constraints on the density and thermal 3D structure of the dense molecular cloud core Rho Oph D are derived from a detailed 3D radiative transfer modeling. Two ISOCAM images at 7 and 15 micron are fitted simultaneously by representing the dust distribution in the core with a series of 3D Gaussian density profiles. Size, total density, and position of the Gaussians are optimized by simulated annealing to obtain a 2D column density map. The projected core density has a complex elongated pattern with two peaks. We propose a new method to calculate an approximate temperature in an externally illuminated complex 3D structure from a mean optical depth. This T(tau)-method is applied to a 1.3 mm map obtained with the IRAM 30m telescope to find the approximate 3D density and temperature distribution of the core Rho Oph D. The spatial 3D distribution deviates strongly from spherical symmetry. The elongated structure is in general agreement with recent gravo-turbulent collapse calculations for molecular clouds. We discuss possible ambiguities of the background determination procedure, errors of the maps, the accuracy of the T(tau)-method, and the influence of the assumed dust particle sizes and properties.

J. Steinacker; A. Bacmann; Th. Henning; R. Klessen; M. Stickel

2004-10-26T23:59:59.000Z

229

EXISTENCE AND UNIQUENESS OF SOLUTIONS OF NONLINEAR SYSTEMS OF CONDUCTIVERADIATIVE HEAT TRANSFER  

E-Print Network (OSTI)

of the equations as described in [5], [9], and [8]. The radiative transport equation is ¯ @/ @x (x; ¯) + /(x of nonlinear integro­ differential equations that model steady­state combined radiative­conductive heat for coupled radiative­conductive heat transport are discussed. These models can be expressed as nonlinear

230

Technology Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

Energy Efficiency & Renewable and Energy - Commercialization Energy Efficiency & Renewable and Energy - Commercialization Deployment SBIR/STTR - Small Business Innovation Research and Small Business Technology Transfer USEFUL LINKS Contract Opportunities: FBO.gov FedConnect.net Grant Opportunities DOE Organization Chart Association of University Technology Managers (AUTM) Federal Laboratory Consortium (FLC) Feedback Contact us about Tech Transfer: Mary.McManmon@science.doe.gov Mary McManmon, 202-586-3509 link to Adobe PDF Reader link to Adobe Flash player Licensing Guide and Sample License The Technology Transfer Working Group (TTWG), made up of representatives from each DOE Laboratory and Facility, recently created a Licensing Guide and Sample License [762-KB PDF]. The Guide will serve to provide a general understanding of typical contract terms and provisions to help reduce both

231

Measurement of radiation impedance of stepped piston radiator  

Science Journals Connector (OSTI)

It was noted in a paper given in 1972 [A. H. Lubell J. Acoust. Soc. Am. 52 1310 (1972)] that the radiation mass of a stepped piston underwater loudspeaker was approximately half of the value expected from simple piston theory. Recently the integral equation approach was used to compute the radiation impedance for the Lubell Laboratories model 98 underwater loudspeaker and new measurements were made. This paper reviews the measurement and data reduction procedures and compares measured and theoretical radiation impedances. The original observation of reduced radiation mass is supported. A companion paper covers the integral equation computation. [This work was supported by Lubell Laboratories Inc.

Alan H. Lubell

1986-01-01T23:59:59.000Z

232

Journal of Statistical Physics, Vol. 95, Nos. 12, 1999 Radiative Transport in a Periodic Structure  

E-Print Network (OSTI)

; final December 1, 1998 We derive radiative transport equations for solutions of a Schrodinger equation and the Bloch wave expansion. The streaming part of the radiative transport equations is determined entirely Radiative transport equations describe propagation of the phase space energy density of high frequency waves

Fannjiang, Albert

233

PARALLELIZATION OF THE P-1 RADIATION MODEL Gautham Krishnamoorthy, Rajesh Rawat, and Philip J. Smith  

E-Print Network (OSTI)

radiation model is spatially decomposed to solve the radiative transport equation on parallel computers describes the paralle- lization of the P-1 approximation to the radiative transport equation (RTE to the discretized transport equations consumes the maximum time in most radiation algorithms. Therefore, the speed

Utah, University of

234

E-Print Network 3.0 - advanced space radiators Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

to investigate radiation variations across land cover discontinuities, to advance... radiative transfer properties Timothy E. Link,1 * Danny Marks2 and Janet P. Hardy3 1...

235

A TWO-MOMENT RADIATION HYDRODYNAMICS MODULE IN ATHENA USING A TIME-EXPLICIT GODUNOV METHOD  

SciTech Connect

We describe a module for the Athena code that solves the gray equations of radiation hydrodynamics (RHD), based on the first two moments of the radiative transfer equation. We use a combination of explicit Godunov methods to advance the gas and radiation variables including the non-stiff source terms, and a local implicit method to integrate the stiff source terms. We adopt the M{sub 1} closure relation and include all leading source terms to O({beta}{tau}). We employ the reduced speed of light approximation (RSLA) with subcycling of the radiation variables in order to reduce computational costs. Our code is dimensionally unsplit in one, two, and three space dimensions and is parallelized using MPI. The streaming and diffusion limits are well described by the M{sub 1} closure model, and our implementation shows excellent behavior for a problem with a concentrated radiation source containing both regimes simultaneously. Our operator-split method is ideally suited for problems with a slowly varying radiation field and dynamical gas flows, in which the effect of the RSLA is minimal. We present an analysis of the dispersion relation of RHD linear waves highlighting the conditions of applicability for the RSLA. To demonstrate the accuracy of our method, we utilize a suite of radiation and RHD tests covering a broad range of regimes, including RHD waves, shocks, and equilibria, which show second-order convergence in most cases. As an application, we investigate radiation-driven ejection of a dusty, optically thick shell in the ISM. Finally, we compare the timing of our method with other well-known iterative schemes for the RHD equations. Our code implementation, Hyperion, is suitable for a wide variety of astrophysical applications and will be made freely available on the Web.

Skinner, M. Aaron; Ostriker, Eve C., E-mail: askinner@astro.umd.edu, E-mail: eco@astro.princeton.edu [Department of Astronomy, University of Maryland, College Park, MD 20742-2421 (United States)

2013-06-01T23:59:59.000Z

236

Electron Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

3 3 Pierre Kennepohl1,2 and Edward Solomon1* 1Department of Chemistry, Stanford University, Stanford, CA 94305 Electron transfer, or the act of moving an electron from one place to another, is amongst the simplest of chemical processes, yet certainly one of the most critical. The process of efficiently and controllably moving electrons around is one of the primary regulation mechanisms in biology. Without stringent control of electrons in living organisms, life could simply not exist. For example, photosynthesis and nitrogen fixation (to name but two of the most well-known biochemical activities) are driven by electron transfer processes. It is unsurprising, therefore, that much effort has been placed on understanding the fundamental principles that control and define the simple act of adding and/or removing electrons from chemical species.

237

TECHNOLOGY TRANSFER  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

404-NOV. 1, 2000 404-NOV. 1, 2000 TECHNOLOGY TRANSFER COMMERCIALIZATION ACT OF 2000 VerDate 11-MAY-2000 04:52 Nov 16, 2000 Jkt 089139 PO 00000 Frm 00001 Fmt 6579 Sfmt 6579 E:\PUBLAW\PUBL404.106 APPS27 PsN: PUBL404 114 STAT. 1742 PUBLIC LAW 106-404-NOV. 1, 2000 Public Law 106-404 106th Congress An Act To improve the ability of Federal agencies to license federally owned inventions. Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, SECTION 1. SHORT TITLE. This Act may be cited as the ''Technology Transfer Commer- cialization Act of 2000''. SEC. 2. FINDINGS. The Congress finds that- (1) the importance of linking our unparalleled network of over 700 Federal laboratories and our Nation's universities with United States industry continues to hold great promise

238

The Effect of g-Jitter on Heat Transfer  

Science Journals Connector (OSTI)

...research-article The Effect of g-Jitter on Heat Transfer Norsarahaida Amin In a gravity-free...in the absence of radiation, heat transfer in a fluid medium is effected...investigation is centred upon the heat transfer from a sphere, maintained at...

1988-01-01T23:59:59.000Z

239

Radiative Transfer in Reflection Edvald Ingi Gislason  

E-Print Network (OSTI)

unique skills and deep understanding of the theory involved proved vital to the success of this project coming from stars within them. With development of new algorithms and hardware, improvements can be made

240

NNSA Transfers Responsibility for Radiation Detection System...  

National Nuclear Security Administration (NNSA)

Twitter, Tumblr, YouTube and Flickr. Established by Congress in 2000, NNSA is a semi-autonomous agency within the U.S. Department of Energy responsible for enhancing national...

Note: This page contains sample records for the topic "radiative transfer equation" 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

Present and Future Computing Requirements Radiative Transfer...  

NLE Websites -- All DOE Office Websites (Extended Search)

Burrows, Jason Nordhaus, Louis Howell, Mike Zingale topics and open questions * thermonuclear supernova: What are the progenitors: 1 or 2 white dwarfs? How does the nuclear...

242

NETL: Tech Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

Licensing & Technology Transfer Available Technologies Partnerships and Licensing Success Stories Contact Us Technology transfer is the process of transferring new technologies...

243

Accelerating the transfer in Technology Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

Accelerating the transfer in Technology Transfer Community Connections: Your link to news and opportunities from Los Alamos National Laboratory Latest Issue: Dec. 2014 - Jan. 2015...

244

The Intense Radiation Gas  

E-Print Network (OSTI)

We present a new dispersion relation for photons that are nonlinearly interacting with a radiation gas of arbitrary intensity due to photon-photon scattering. It is found that the photon phase velocity decreases with increasing radiation intensity, it and attains a minimum value in the limit of super-intense fields. By using Hamilton's ray equations, a self-consistent kinetic theory for interacting photons is formulated. The interaction between an electromagnetic pulse and the radiation gas is shown to produce pulse self-compression and nonlinear saturation. Implications of our new results are discussed.

M. Marklund; P. K. Shukla; B. Eliasson

2005-03-08T23:59:59.000Z

245

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

246

Transport Equations for Elastic and Other Waves in Random Leonid Ryzhik, George Papanicolaou and Joseph B. Keller  

E-Print Network (OSTI)

. Contents 1 Introduction and Summary 2 1.1 Radiative Transport Equations : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 10 2 Radiative Transport Theory for the Schr¨odinger Equation 11 2.1 High Frequency Asymptotics expansion for the Transport Approximation 55 1 Introduction and Summary 1.1 Radiative Transport Equations

Ryzhik, Lenya

247

Transport Equations for Elastic and Other Waves in Random Leonid Ryzhik, George Papanicolaou and Joseph B. Keller  

E-Print Network (OSTI)

. Contents 1 Introduction and Summary 2 1.1 Radiative Transport Equations : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 10 2 Radiative Transport Theory for the Schrodinger Equation 11 2.1 High Frequency Asymptotics expansion for the Transport Approximation 55 1 Introduction and Summary 1.1 Radiative Transport Equations

Papanicolaou, George C.

248

Dynamics of heat transfer between nano systems  

E-Print Network (OSTI)

We develop a dynamical theory of heat transfer between two nano systems. In particular, we consider the resonant heat transfer between two nanoparticles due to the coupling of localized surface modes having a finite spectral width. We model the coupled nanosystem by two coupled quantum mechanical oscillators, each interacting with its own heat bath, and obtain a master equation for the dynamics of heat transfer. The damping rates in the master equation are related to the lifetimes of localized plasmons in the nanoparticles. We study the dynamics towards the steady state and establish connection with the standard theory of heat transfer in steady state. For strongly coupled nano particles we predict Rabi oscillations in the mean occupation number of surface plasmons in each nano particle.

Svend-Age Biehs; Girish S. Agarwal

2012-10-18T23:59:59.000Z

249

Neutrino Transfer in Three Dimensions for Core-Collapse Supernovae. I. Static Configurations  

E-Print Network (OSTI)

We develop a numerical code to calculate the neutrino transfer with multi-energy and multi-angle in three dimensions (3D) for the study of core-collapse supernovae. The numerical code solves the Boltzmann equations for neutrino distributions by the discrete-ordinate (S_n) method with a fully implicit differencing for time advance. The Boltzmann equations are formulated in the inertial frame with collision terms being evaluated to the zeroth order of v/c. A basic set of neutrino reactions for three neutrino species is implemented together with a realistic equation of state of dense matter. The pair process is included approximately in order to keep the system linear. We present numerical results for a set of test problems to demonstrate the ability of the code. The numerical treatments of advection and collision terms are validated first in the diffusion and free streaming limits. Then we compute steady neutrino distributions for a background extracted from a spherically symmetric, general relativistic simulation of 15Msun star and compare them with the results in the latter computation. We also demonstrate multi-D capabilities of the 3D code solving neutrino transfers for artificially deformed supernova cores in 2D and 3D. Formal solutions along neutrino paths are utilized as exact solutions. We plan to apply this code to the 3D neutrino-radiation hydrodynamics simulations of supernovae. This is the first article in a series of reports on the development.

Kohsuke Sumiyoshi; Shoichi Yamada

2012-01-11T23:59:59.000Z

250

ASME Journal of Heat Transfer Vol.118, pp.592-598, 1996  

E-Print Network (OSTI)

. The coupled governing equations for time- dependent convective heat transfer in the fluid flow and conduction to pay increasing attention to the study of heat transfer and fluid flow characteristicsASME Journal of Heat Transfer Vol.118, pp.592-598, 1996 OSCILLATORY HEAT TRANSFER IN A PIPE

Zhao, Tianshou

251

Radiative transport limit for the random Schrodinger Guillaume Bal  

E-Print Network (OSTI)

Radiative transport limit for the random Schr¨odinger equation Guillaume Bal George Papanicolaou converges to the solution of a radiative transport equation. The propagation of wave energy in a scattering Leonid Ryzhik May 8, 2002 Abstract We give a detailed mathematical analysis of the radiative transport

Papanicolaou, George C.

252

A GEOMETRIC DERIVATION OF THE LINEAR BOLTZMANN EQUATION FOR A PARTICLE INTERACTING WITH A  

E-Print Network (OSTI)

] the radiative transport equation in the spatially homogenous case. Later Ho, Landau and Wilkins studied in [29 Boltzmann equation was derived in the radiative transport limit by Bal, Papanicolaou and Ryzhik [5A GEOMETRIC DERIVATION OF THE LINEAR BOLTZMANN EQUATION FOR A PARTICLE INTERACTING WITH A GAUSSIAN

Paris-Sud XI, Université de

253

Alpha Radiation  

NLE Websites -- All DOE Office Websites (Extended Search)

Basics of Radiation Basics of Radiation Gamma Radiation and X-Rays Beta Radiation Alpha Radiation Irradiation Radioactive Contamination Definitions Detection Measurement Safety Around Radiation Sources Types of Radiation Exposure Managing Radiation Emergencies Basics of Radiation Characteristics of Alpha Radiation 1. Alpha radiation is not able to penetrate skin. 2. Alpha-emitting materials can be harmful to humans if the materials are inhaled, swallowed, or absorbed through open wounds. 3. A variety of instruments have been designed to measure alpha radiation. Special training in use of these instruments is essential for making accurate measurements. 4. A civil defense instrument (CD V-700) cannot detect the presence of radioactive materials that produce alpha radiation unless the radioactive materials also produce beta and/or gamma radiation.

254

Radiation: Radiation Control (Indiana)  

Energy.gov (U.S. Department of Energy (DOE))

It is the policy of the state to encourage the constructive uses of radiation and to control its harmful effects. This section contains regulations pertaining to the manufacture, use,...

255

FALL 2011 EMEC 326 DR. RUHUL AMIN HEAT TRANSFER 201 C Roberts Hall  

E-Print Network (OSTI)

FALL 2011 EMEC 326 DR. RUHUL AMIN HEAT TRANSFER 201 C Roberts Hall Phone: 994-6295 POLICY STATEMENT, convection, and radiation formulations. Introduction to heat transfer equipment. Course credit: 4

Dyer, Bill

256

FACET: a radiation view factor computer code for axisymmetric, 2D planar, and 3D geometries with shadowing  

SciTech Connect

The computer code FACET calculates the radiation geometric view factor (alternatively called shape factor, angle factor, or configuration factor) between surfaces for axisymmetric, two-dimensional planar and three-dimensional geometries with interposed third surface obstructions. FACET was developed to calculate view factors for input to finite-element heat-transfer analysis codes. The first section of this report is a brief review of previous radiation-view-factor computer codes. The second section presents the defining integral equation for the geometric view factor between two surfaces and the assumptions made in its derivation. Also in this section are the numerical algorithms used to integrate this equation for the various geometries. The third section presents the algorithms used to detect self-shadowing and third-surface shadowing between the two surfaces for which a view factor is being calculated. The fourth section provides a user's input guide followed by several example problems.

Shapiro, A.B.

1983-08-01T23:59:59.000Z

257

Radiative transport limit for the random Schrodinger Guillaume Bal George Papanicolaou y Leonid Ryzhik z  

E-Print Network (OSTI)

Radiative transport limit for the random Schrodinger equation Guillaume Bal #3; George of the radiative transport limit for the average phase space density of solutions of the Schrodinger equation to the solution of a radiative transport equation. The propagation of wave energy in a scattering medium

Ryzhik, Lenya

258

The Cosmic Equation of State  

E-Print Network (OSTI)

The cosmic spacetime is often described in terms of the FRW metric, though the adoption of this elegant and convenient solution to Einstein's equations does not tell us much about the equation of state, p=w rho, in terms of the total energy density rho and pressure p of the cosmic fluid. LCDM and the R_h=ct Universe are both FRW cosmologies that partition rho into (at least) three components, matter rho_m, radiation rho_r, and a poorly understood dark energy rho_de, though the latter goes one step further by also invoking the constraint w=-1/3. This condition is required by the simultaneous application of the Cosmological principle and Weyl's postulate. Model selection tools in one-on-one comparisons favor R_h=ct with a likelihood of ~90% versus only ~10% for LCDM. Nonetheless, the predictions of LCDM often come quite close to those of R_h=ct, suggesting that its parameters are optimized to mimic the w=-1/3 equation of state. In this paper, we demonstrate that the equation of state in R_h=ct helps us to understand why the optimized fraction Omega_m=rho_m/rho in LCDM must be ~0.27, an otherwise seemingly random variable. We show that when one forces LCDM to satisfy the equation of state w=(rho_r/3-rho_de)/rho, the value of the Hubble radius today, c/H_0, can equal its measured value ct_0 only with Omega_m~0.27 when the equation of state for dark energy is w_de=-1. This peculiar value of Omega_m therefore appears to be a direct consequence of trying to fit the data with the equation of state w=(rho_r/3-rho_de)/rho in a Universe whose principal constraint is instead R_h=ct or, equivalently, w=-1/3.

Fulvio Melia

2014-11-21T23:59:59.000Z

259

Transferring Data at NERSC  

NLE Websites -- All DOE Office Websites (Extended Search)

Data Transferring Data Advice and Overview NERSC provides many facilities for storing data and performing analysis. However, transfering data - whether over the wide area network...

260

Heat transfer in open cell polyurethane foam insulation  

Science Journals Connector (OSTI)

This paper study systematic investigates the combined conductive and non-gray radiative heat transfer of open cell polyurethane (PU) foam in the pressure range between 760 and 0.02?Torr. Direct transmission m...

J.-W. Wu; H.-S. Chu

1998-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

Accelerating the transfer in Technology Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

Accelerating the transfer in Technology Transfer Accelerating the transfer in Technology Transfer Community Connections: Our link to Northern New Mexico Communities Latest Issue:Dec. 2013 - Jan. 2014 All Issues » submit Accelerating the transfer in Technology Transfer Express Licensing fast tracks commercialization. May 1, 2013 Division Leader Dave Pesiri Division Leader Dave Pesiri. Contact Editor Linda Anderman Email Community Programs Office Kurt Steinhaus Email Express Licensing program To better serve its partners, one of the first improvements the Lab's Technology Transfer Division (TT) has made is through its new Express Licensing initiative. Standardized license agreements and fee structures will remove long and complicated negotiations and decrease the time required to get patented Lab technology and software into the hands of

262

Heat transfer in proteinwater interfaces Anders Lervik,ab  

E-Print Network (OSTI)

Heat transfer in protein­water interfaces Anders Lervik,ab Fernando Bresme,*ac Signe Kjelstrup of the heat diffusion equation we compute the thermal conductivity and thermal diffusivity of the proteins by about 4 nm.4 It is expected that the energy transfer between these sites may involve the concerted

Kjelstrup, Signe

263

Incoherent Energy Transfer within Light-harvesting Complexes  

E-Print Network (OSTI)

Rate equations are used to model spectroscopic observation of incoherent energy transfer in light-harvesting antenna systems based upon known structures. A two-parameter two-dimensional model is proposed. The transfer rates obtained, by matching the fluorescent decay, are self-consistent within our model.

Juhi-Lian Julian Ting

1999-04-24T23:59:59.000Z

264

The Cosmic Equation of State  

E-Print Network (OSTI)

The cosmic spacetime is often described in terms of the FRW metric, though the adoption of this elegant and convenient solution to Einstein's equations does not tell us much about the equation of state, p=w rho, in terms of the total energy density rho and pressure p of the cosmic fluid. LCDM and the R_h=ct Universe are both FRW cosmologies that partition rho into (at least) three components, matter rho_m, radiation rho_r, and a poorly understood dark energy rho_de, though the latter goes one step further by also invoking the constraint w=-1/3. This condition is required by the simultaneous application of the Cosmological principle and Weyl's postulate. Model selection tools in one-on-one comparisons favor R_h=ct with a likelihood of ~90% versus only ~10% for LCDM. Nonetheless, the predictions of LCDM often come quite close to those of R_h=ct, suggesting that its parameters are optimized to mimic the w=-1/3 equation of state. In this paper, we demonstrate that the equation of state in R_h=ct helps us to under...

Melia, Fulvio

2014-01-01T23:59:59.000Z

265

Federal Laboratory Technology Transfer  

E-Print Network (OSTI)

Federal Laboratory Technology Transfer Fiscal Year 2008 Prepared by: National Institute to submit this fiscal year 2008 Technology Transfer Summary Report to the President and the Congress transfer authorities established by the Technology Transfer Commercialization Act of 2000 (P.L. 106

Perkins, Richard A.

266

A fourth-order symplectic finite-difference time-domain (FDTD) method for light scattering and a 3D Monte Carlo code for radiative transfer in scattering systems  

E-Print Network (OSTI)

as Fig. 1. The center of the spherical particle is chosen as the origin. The size parameter is defined as: X = ka = 2piNa? . (2.26) A time-harmonic electromagnetic field (E,H) in a linear, isotropic, homogeneous medium satisfies the vector wave equation... as Fig. 1. The center of the spherical particle is chosen as the origin. The size parameter is defined as: X = ka = 2piNa? . (2.26) A time-harmonic electromagnetic field (E,H) in a linear, isotropic, homogeneous medium satisfies the vector wave equation...

Zhai, Pengwang

2009-06-02T23:59:59.000Z

267

Radiative Rayleigh-Taylor instabilities  

E-Print Network (OSTI)

We perform analytic linear stability analyses of an interface separating two stratified media threaded by a radiation flux, a configuration relevant in several astrophysical contexts. We develop a general framework for analyzing such systems, and obtain exact stability conditions in several limiting cases. In the optically thin, isothermal regime, where the discontinuity is chemical in nature (e.g.\\ at the boundary of a radiation pressure-driven H \\textsc{ii} region), radiation acts as part of an effective gravitational field, and instability arises if the effective gravity per unit volume toward the interface overcomes that away from it. In the optically thick "adiabatic" regime where the total (gas plus radiation) specific entropy of a Lagrangian fluid element is conserved,for example at the edge of radiation pressure-driven bubble around a young massive star, we show that radiation acts like a modified equation of state, and we derive a generalized version of the classical Rayleigh-Taylor stability conditi...

Jacquet, Emmanuel

2011-01-01T23:59:59.000Z

268

About Radiation  

NLE Websites -- All DOE Office Websites (Extended Search)

Radiation Radiation What is radiation? Radiation is a form of energy that is a part of our everyday lives. All of us receive a "dose" of radiation each day. Most of the dose comes from naturally occurring radioactive materials such as uranium, thorium, radon, and certain forms of potassium and carbon. The air we breathe contains radon, the food we eat contains uranium and thorium from the soil, and our bodies contain radioactive forms of potassium and carbon. Cosmic radiation from the sun also contributes to our natural radiation dose. We also receive radiation doses from man-made sources such as X-rays, nuclear medical procedures, power plants, smoke detectors and older television sets. Some people, such as nuclear plant operators, flight crews, and nuclear medicine staff may also receive an occupational radiation dose.

269

Non-equilibrium electromagnetic fluctuations: Heat transfer and interactions  

E-Print Network (OSTI)

The Casimir force between arbitrary objects in equilibrium is related to scattering from individual bodies. We extend this approach to heat transfer and Casimir forces in non-equilibrium cases where each body, and the environment, is at a different temperature. The formalism tracks the radiation from each body and its scatterings by the other objects. We discuss the radiation from a cylinder, emphasizing its polarized nature, and obtain the heat transfer between a sphere and a plate, demonstrating the validity of proximity transfer approximation at close separations and arbitrary temperatures.

Matthias Krger; Thorsten Emig; Mehran Kardar

2011-02-18T23:59:59.000Z

270

JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER Vol. 14, No. 4, OctoberDecember 2000  

E-Print Network (OSTI)

JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER Vol. 14, No. 4, October­December 2000 Multidimensional are optical tomographyof tissue, remote sensing of oceansand atmospheres, laser material processing radiative heat transfer in participat- ing media in recent years. However, the analysis of radiative heat

Guo, Zhixiong "James"

271

W. FIFTH AVE. RADIATION LAB  

E-Print Network (OSTI)

W. FIFTH AVE. NASA SPACE RADIATION LAB 958 ENERGY EFFICIENCY & CONSERVATION DIVISION THOMSON RD. E Development & Technology Transfer 490 H7 Energy Efficiency and Conservation Division 526 L5 Energy Sciences CAD Installation Complex 933 K2 Carpentry/Signs Shops 422 F6 Cavendish House 153 G7 Center

Ohta, Shigemi

272

7, 72357275, 2007 Adaptive radiative  

E-Print Network (OSTI)

Discussions Two adaptive radiative transfer schemes for numerical weather prediction models V. Venema 1 , A numerical weather prediction (NWP) and climate models. The atmosphere and the land surface are complex-stream approximation. In most weather prediction models these parameterisation schemes are therefore called infre

Boyer, Edmond

273

Report of the Nuclear Energy Agency Expert Group on Gut Transfer Factors: Implications for Dose per Unit Intake  

Science Journals Connector (OSTI)

......Radiation Protection Dosimetry Article Report of the Nuclear Energy Agency Expert Group on Gut Transfer Factors: Implications...transfer factors recommended by an Expert Group of the Nuclear Energy Agency for intakes of certain important elements in......

G.M. Kendall; J.D. Harrison; T.P. Fell

1988-09-01T23:59:59.000Z

274

Danger radiations  

ScienceCinema (OSTI)

Le confrencier Mons.Hofert parle des dangers et risques des radiations, le contrle des zones et les prcautions prendre ( p.ex. film badge), comment mesurer les radiations etc.

None

2011-04-25T23:59:59.000Z

275

NERSC's Data Transfer Nodes  

NLE Websites -- All DOE Office Websites (Extended Search)

Data Transfer Nodes Data Transfer Nodes Data Transfer Nodes Overview The data transfer nodes are NERSC servers dedicated to performing transfers between NERSC data storage resources such as HPSS and the NERSC Global Filesystem (NGF), and storage resources at other sites including the Leadership Computing Facility at ORNL (Oak Ridge National Laboratory). These nodes are being managed (and monitored for performance) as part of a collaborative effort between ESnet, NERSC, and ORNL to enable high performance data movement over the high-bandwidth 10Gb ESnet wide-area network (WAN). Restrictions In order to keep the data transfer nodes performing optimally for data transfers, we request that users restrict interactive use of these systems to tasks that are related to preparing data for transfer or are directly

276

Inverse Energy Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

which is unstable. It saturates by transfer to a separate, damped eigenmode (i.e., a subcritical spectrum of damped waves). Inverse energy transfer is carried by three-wave...

277

HEAT TRANSFER FLUIDS  

E-Print Network (OSTI)

The choice of heat transfer fluids has significant effects on the performance, cost, and reliability of solar thermal systems. In this chapter, we evaluate existing heat transfer fluids such as oils and molten salts based ...

Lenert, Andrej

2012-01-01T23:59:59.000Z

278

Phase-Transfer Catalysts  

Science Journals Connector (OSTI)

In previous chapters we learned that a phase-transfer catalyst must have two particular chemical functions to be successful, that is, it must rapidly transfer one of the reactant species into the normal phase ...

Charles M. Starks; Charles L. Liotta; Marc E. Halpern

1994-01-01T23:59:59.000Z

279

INL Technology Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

Technology Transfer Through collaboration with industry partners, INL's Technology Deployment office makes available to American agencies and international organizations unique...

280

HEAT TRANSFERS IN A DOUBLE SKIN ROOF VENTILATED BY NATURAL CONVECTION IN SUMMER TIME  

E-Print Network (OSTI)

1 HEAT TRANSFERS IN A DOUBLE SKIN ROOF VENTILATED BY NATURAL CONVECTION IN SUMMER TIME P. H or in tropical and arid countries. In this work, radiation, convection and conduction heat transfers-dimensional numerical simulation of the heat transfers through the double skin reveals the most important parameters

Boyer, Edmond

Note: This page contains sample records for the topic "radiative transfer equation" 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

Two-Dimensional Computational Fluid Dynamics and Conduction Simulations of Heat Transfer in Window Frames  

E-Print Network (OSTI)

1 Two-Dimensional Computational Fluid Dynamics and Conduction Simulations of Heat Transfer Arasteh and Dragan Curcija ABSTRACT Accurately analyzing heat transfer in window frame cavities radiation heat-transfer effects.) We examine three representative complex cavity cross-section profiles

282

ENHANCING THE TRANSFER STUDENT  

E-Print Network (OSTI)

Efforts #12;Who Are Ohio State Transfer Students? #12;TRANSFER PROFILE DatafromSU12,AU12,SP13 3 as NFYS: 576 Average Transfer Hours of Enrolled Student: 52.2 Living on Campus: 470 Total # Sending Expectations (time management skills, balancing a more rigorous course load, study skills) 13.24% Majors (how

283

Federal Laboratory Technology Transfer  

E-Print Network (OSTI)

Federal Laboratory Technology Transfer Fiscal Year 2007 Prepared by: National Institute to present to the President and the Congress this Federal Laboratory Technology Transfer Report summarizing the achievements of Federal technology transfer and partnering programs of the Federal research and development

Perkins, Richard A.

284

Federal Laboratory Technology Transfer  

E-Print Network (OSTI)

Federal Laboratory Technology Transfer Fiscal Year 2009 Prepared by: National Institute to submit this fiscal year 2009 Technology Transfer Summary Report to the President and the Congress in accordance with 15 USC Sec 3710(g)(2) for an annual summary on the implementation of technology transfer

Perkins, Richard A.

285

Heat Transfer Guest Editorial  

E-Print Network (OSTI)

Journal of Heat Transfer Guest Editorial We are indeed delighted in bringing out this special issue was showcased in diverse areas such as traditional heat and mass transfer, lab-on-chip, sensors, biomedical applica- tions, micromixers, fuel cells, and microdevices. Selected papers in the field of heat transfer

Kandlikar, Satish

286

Anisotropic radiation from accretion disc-coronae in active galactic nuclei  

E-Print Network (OSTI)

In the unification scheme of active galactic nuclei (AGN), Seyfert 1s and Seyfert 2s are intrinsically same, but they are viewed at different angles. However, the Fe K\\alpha emission line luminosity of Seyfert 1s was found in average to be about twice of that of Seyfert 2s at given X-ray continuum luminosity in the previous work (Ricci et al. 2014). We construct an accretion disc-corona model, in which a fraction of energy dissipated in the disc is extracted to heat the corona above the disc. The radiation transfer equation containing Compton scattering processes is an integro-differential equation, which is solved numerically for the corona with a parallel plane geometry. We find that the specific intensity of X-ray radiation from the corona changes little with the viewing angle \\theta when \\theta is small (nearly face-on), and it is sensitive to \\theta if the viewing angle is large (\\theta> 40 degrees). The radiation from the cold disc, mostly in infrared/optical/UV bands, is almost proportional to cos\\thet...

Xu, Ya-Di

2015-01-01T23:59:59.000Z

287

Heat transfer system  

DOE Patents (OSTI)

A heat transfer system for a nuclear reactor. Heat transfer is accomplished within a sealed vapor chamber which is substantially evacuated prior to use. A heat transfer medium, which is liquid at the design operating temperatures, transfers heat from tubes interposed in the reactor primary loop to spaced tubes connected to a steam line for power generation purposes. Heat transfer is accomplished by a two-phase liquid-vapor-liquid process as used in heat pipes. Condensible gases are removed from the vapor chamber through a vertical extension in open communication with the chamber interior.

McGuire, Joseph C. (Richland, WA)

1982-01-01T23:59:59.000Z

288

Estimating optical properties in layered tissues by use of the Born approximation of the radiative  

E-Print Network (OSTI)

of the radiative transport equation to recover simultaneously the absorption and scattering coefficients approximation of the radiative transport equation (RTE).1­3 These methods are lim- ited to systems whose reduced transport equation Arnold D. Kim School of Natural Science, University of California, Merced, P. O. Box 2039

Kim, Arnold D.

289

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

290

Constructing a Model Transport Equation for a Massless Bose Gas and its Analytic Solution  

E-Print Network (OSTI)

A model kinetic equation is constructed for the transport of a massless Bose gas. This equation is applied to solution of the boundary value problem for the transport of radiation in the half-space occupied by a dispersive medium that is in local thermal equilibrium with the radiation. It is shown that the difference in temperature between the dispersive medium and the incident radiation depends substantially on the character of the scattering properties of the particles of the medium.

A. V. Latyshev; A. A. Yushkanov

2010-12-14T23:59:59.000Z

291

Radiative transport theory for light propagation in luminescent media  

E-Print Network (OSTI)

the radiative transport equation (RTE) [1,2]. It has been applied successfully to many prob- lemsRadiative transport theory for light propagation in luminescent media Derya ahin* and Boaz Ilan of radiative transport theory to account for light propagation in luminescent random media. This theory

Ilan, Boaz

292

Canopy radiation transmission for an energy balance snowmelt model  

E-Print Network (OSTI)

Canopy radiation transmission for an energy balance snowmelt model Vinod Mahat1 and David G January 2012. [1] To better estimate the radiation energy within and beneath the forest canopy for energy differential equations using a single path assumption were solved analytically to approximate the radiation

Tarboton, David

293

Weakly Dissipative Waterwave Equations  

E-Print Network (OSTI)

We also discuss the case of some Kadomstev-Petviashvili equation. Part of these results were obtained in collaboration with M. Abounouh and R. Rosa.

294

Radiator Labs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Radiator Labs Radiator Labs National Clean Energy Business Plan Competition Radiator Labs Columbia University More than 14 million housing units, or 10 percent of the national housing stock, is heated by steam and hot water. Steam heating, which represents the majority of this market, is particularly inefficient, and is characterized by a central source of steam generation with a convective distribution system via a network of pipes and radiators. There is no way to control heat transfer through this network, so building managers configure boiler systems to treat a building as a single zone keeping the coldest apartment above a minimum statutory temperature. This results in overheating of the other spaces in the building due to differences in exposure, level of insulation, distribution system heating,

295

Radiator Labs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Competition » Radiator Labs Competition » Radiator Labs National Clean Energy Business Plan Competition Radiator Labs Columbia University More than 14 million housing units, or 10 percent of the national housing stock, is heated by steam and hot water. Steam heating, which represents the majority of this market, is particularly inefficient, and is characterized by a central source of steam generation with a convective distribution system via a network of pipes and radiators. There is no way to control heat transfer through this network, so building managers configure boiler systems to treat a building as a single zone keeping the coldest apartment above a minimum statutory temperature. This results in overheating of the other spaces in the building due to differences in exposure, level of insulation, distribution system heating,

296

Radiator Labs | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Competition » Radiator Labs Competition » Radiator Labs National Clean Energy Business Plan Competition Radiator Labs Columbia University More than 14 million housing units, or 10 percent of the national housing stock, is heated by steam and hot water. Steam heating, which represents the majority of this market, is particularly inefficient, and is characterized by a central source of steam generation with a convective distribution system via a network of pipes and radiators. There is no way to control heat transfer through this network, so building managers configure boiler systems to treat a building as a single zone keeping the coldest apartment above a minimum statutory temperature. This results in overheating of the other spaces in the building due to differences in exposure, level of insulation, distribution system heating,

297

MULTI-POINT RADIATION MONITOR  

SciTech Connect

A unique radiation monitor has been developed for performing wide-area field surveys for radiation sources. This device integrates the real-time output of multiple radiation detectors into a hand-held personal computer (e.g., a PDA) containing an intuitive graphical user interface. An independent hardware module supplies high voltage to the detectors and contains a rapid sampling system for transferring the detector count rates through an interface to the PDA. The imbedded firmware can be changed for various applications using a programmable memory card. As presently configured, the instrument contains a series of Geiger-Mueller (GM) tubes in a flexible detector string. This linear array of multiple sensors can be used by US Coast Guard and Customs container inspection personnel to measure radiation intensity in stacks of transport containers where physical access is impeded.

Hofstetter, K; Donna Beals, D; Ken Odell, K; Robert Eakle, R; Russell Huffman, R; Larry Harpring, L

2006-05-12T23:59:59.000Z

298

A Refined Model of Stationary Heat Transfer in Composite Bodies Reinforced with Pipes Containing a Heat-Transfer Fluid Moving in Laminar Flow Conditions  

Science Journals Connector (OSTI)

Equations describing the stationary heat conduction of composite bodies spatially reinforced with ... of smooth pipes, through which an incompressible heat-transfer fluid is pumped in laminar flow conditions, are...

A. P. Yankovskii

2014-03-01T23:59:59.000Z

299

Fuel transfer system  

DOE Patents (OSTI)

A nuclear fuel bundle fuel transfer system includes a transfer pool containing water at a level above a reactor core. A fuel transfer machine therein includes a carriage disposed in the transfer pool and under the water for transporting fuel bundles. The carriage is selectively movable through the water in the transfer pool and individual fuel bundles are carried vertically in the carriage. In a preferred embodiment, a first movable bridge is disposed over an upper pool containing the reactor core, and a second movable bridge is disposed over a fuel storage pool, with the transfer pool being disposed therebetween. A fuel bundle may be moved by the first bridge from the reactor core and loaded into the carriage which transports the fuel bundle to the second bridge which picks up the fuel bundle and carries it to the fuel storage pool. 6 figures.

Townsend, H.E.; Barbanti, G.

1994-03-01T23:59:59.000Z

300

Fuel transfer system  

DOE Patents (OSTI)

A nuclear fuel bundle fuel transfer system includes a transfer pool containing water at a level above a reactor core. A fuel transfer machine therein includes a carriage disposed in the transfer pool and under the water for transporting fuel bundles. The carriage is selectively movable through the water in the transfer pool and individual fuel bundles are carried vertically in the carriage. In a preferred embodiment, a first movable bridge is disposed over an upper pool containing the reactor core, and a second movable bridge is disposed over a fuel storage pool, with the transfer pool being disposed therebetween. A fuel bundle may be moved by the first bridge from the reactor core and loaded into the carriage which transports the fuel bundle to the second bridge which picks up the fuel bundle and carries it to the fuel storage pool.

Townsend, Harold E. (Campbell, CA); Barbanti, Giancarlo (Cupertino, CA)

1994-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

Radiative Importance of ThinŽ Liquid Water Clouds  

NLE Websites -- All DOE Office Websites (Extended Search)

Program Program Accomplishments of the Instantaneous Radiative Flux (IRF) Working Group August 2006 AERI Observations at Southern Great Plains Improve Infrared Radiative Transfer Models Turner et al., JAS, 2004 * AERI observations used to evaluate clear sky IR radiative transfer models * Long-term comparisons have improved - Spectral line database parameters - Water vapor continuum absorption models * Reduced errors in computation of downwelling radiative IR flux by approx 4; current uncertainty is on the order of 1.5 W/m 2 AERI - (Pre-ARM Model) AERI - (Model in 2003) 1 RU = 1 mW / (m 2 sr cm -1 ) Excellent Agreement in Clear Sky Shortwave Radiative Transfer Between Obs and Calcs Shortwave Flux Bias (Solid) Shortwave Flux RMS (Hatched) W m -2 * Comparison of shortwave radiative flux at the surface

302

Technology Transfer: About the Technology Transfer Department  

NLE Websites -- All DOE Office Websites (Extended Search)

About the Technology Transfer and Intellectual Property Management About the Technology Transfer and Intellectual Property Management Department The Technology Transfer Department helps move technologies from the Lab to the marketplace to benefit society and the U. S. economy. We accomplish this through developing and managing an array of partnerships with the private and public sectors. What We Do We license a wide range of cutting-edge technologies to companies that have the financial, R & D, manufacturing, marketing, and managerial capabilities to successfully commercialize Lab inventions. In addition, we manage lab-industry research partnerships, ensure that inventions receive appropriate patent or copyright protection, license technology to start-up companies, distribute royalties to the Lab and to inventors and serve as

303

NREL: Technology Transfer - About Technology Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

About Technology Transfer About Technology Transfer Through technology partnerships, NREL seeks to reduce private sector risk and enable investment in the adoption of renewable energy and energy efficiency technologies. The transfer of these technologies to the marketplace helps displace oil, reduce carbon emissions, and increase U.S. industry competitiveness. Principles NREL develops and implements technology partnerships based on the standards established by the following principles: Balancing Public and Private Interest Form partnerships that serve the public interest and advance U.S. Department of Energy goals. Demonstrate appropriate stewardship of publicly funded assets, yielding national benefits. Provide value to the commercial partner. Focusing on Outcomes Develop mutually beneficial collaborations through processes, which are

304

Plasma Radiation  

Science Journals Connector (OSTI)

... JUST over ten years ago the first book on plasma physics as a subject in its own right appeared; in a gradually swelling stream ... been surprisingly few monographs. One topic which has had scant coverage in any form is plasma radiation (except for spectral-line radiation which has been dealt with very fully in ...

T. J. M. BOYD

1967-07-01T23:59:59.000Z

305

Partnerships and Technology Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

Partnerships and Technology Transfer User Facilities Visiting Us Contact Us Home About Us Success Stories Events News ORNL Inventors (internal only) Find a Technology Search go...

306

Technology Transfer Ombudsman Program  

Energy.gov (U.S. Department of Energy (DOE))

The Technology Transfer Commercialization Act of 2000, Public Law 106-404 (PDF) was enacted in November 2000. Pursuant to Section 11, Technology Partnerships Ombudsman, each DOE national...

307

Facility Survey & Transfer  

Energy.gov (U.S. Department of Energy (DOE))

As DOE facilities become excess, many that are radioactively and/or chemically contaminated will become candidate for transfer to DOE-EM for deactivation and decommissioning.

308

MATERIALS TRANSFER AGREEMENT  

NLE Websites -- All DOE Office Websites (Extended Search)

MTAXX-XXX 1 MATERIAL TRANSFER AGREEMENT for Manufacturing Demonstration Facility and Carbon Fiber Technology Facility In order for the RECIPIENT to obtain materials, the RECIPIENT...

309

Tunable transfer | EMSL  

NLE Websites -- All DOE Office Websites (Extended Search)

to microbes by studying that transfer in a nature-inspired, protein and iron-based nanoparticle system. Iron plays a crucial role in environmental biogeochemistry. It readily...

310

Heat transfer dynamics  

SciTech Connect

As heat transfer technology increases in complexity, it becomes more difficult for those without thermal dynamics engineering training to choose between competitive heat transfer systems offered to meet their drying requirements. A step back to the basics of heat transfer can help professional managers and papermakers make informed decisions on alternative equipment and methods. The primary forms of heat and mass transfer are reviewed with emphasis on the basics, so a practical understanding of each is gained. Finally, the principles and benefits of generating infrared energy by combusting a gaseous hydrocarbon fuel are explained.

Smith, T.M. (Marsden, Inc., Pennsauken, NJ (United States))

1994-08-01T23:59:59.000Z

311

Equations shorten pipe collapse calculations  

SciTech Connect

The API suggests collapse pressure equations for long, perfectly round, steel oil field casing, tubing, drill pipe, and line pipe. Operating and service company engineers can substitute two pipe collapse pressure equations for the 12 API equations now in general use. The shorthand results are almost the same as those from the API equations. The shorthand method has the additional advantage of allowing units from any measurement system. The API equations restrict calculations to US units only. The equation box lists the API (Equations 1--12) and the shorthand (Equations 13--14) equations. The API equations are based on work started shortly after the turn of the century.

Avakov, V.A. [Halliburton Energy Services, Duncan, OK (United States)

1995-04-10T23:59:59.000Z

312

Reduced Braginskii equations  

SciTech Connect

A set of reduced Braginskii equations is derived without assuming flute ordering and the Boussinesq approximation. These model equations conserve the physical energy. It is crucial at finite {beta} that we solve the perpendicular component of Ohm`s law to conserve the physical energy while ensuring the relation {del} {center_dot} j = 0.

Yagi, M. [Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment; Horton, W. [Texas Univ., Austin, TX (United States). Inst. for Fusion Studies

1993-11-01T23:59:59.000Z

313

Reduced Braginskii equations  

SciTech Connect

A set of reduced Braginskii equations is derived without assuming flute ordering and the Boussinesq approximation. These model equations conserve the physical energy. It is crucial at finite [beta] that the perpendicular component of Ohm's law be solved to ensure [del][center dot][bold j]=0 for energy conservation.

Yagi, M.; Horton, W. (Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States))

1994-07-01T23:59:59.000Z

314

Acoustic horn reflectance: Equations and measurements  

Science Journals Connector (OSTI)

Reflectance is the transfer function between forward and reflected components of pressure waves that propagate in wave guides such as acoustic horns. Exact solutions to Webster's Horn Equation are only known for a few specific shapes including parabolic conical and exponential. Explicit equations for reflectance in these three horn shapes were recently published for infinite-length horns. Measured reflectance in 3D-printed finite-length examples of these horn shapes show no similarity in the frequency-domain to exact reflectance for infinite-length horns. The similarity improves after adjustments to both the equations and the measurements. New equations were derived for exact reflectance of finite-length horns. Measured reflectance was smoothed by time-domain windowing. In contrast to frequency-domain reflectance comparisons of time-domain reflectance prior to the time sound reaches the end of the horn were not much affected by these adjustments. Because exact equations are known and 3D-printed examples are easy to obtain these three horn shapes may be useful as standards for comparing different reflectance-measurement systems.

2014-01-01T23:59:59.000Z

315

new freshmen new transfers  

E-Print Network (OSTI)

for AP courses. Transfer GPA is based on a 4-point scale. #12;ETHNICITY African American/Black Am Indian% Number 48 81 GENDER Male Female ETHNICITY African American Am Indian/AK Native Asian Hispanic Pacificth %-ile 690 740 710 31 Transfers 3.67 Freshman GPA is calculated taking into account a 5-point scale

Koehler, Carla

316

RADIATION MAGNETOHYDRODYNAMIC SIMULATIONS OF PROTOSTELLAR COLLAPSE: PROTOSTELLAR CORE FORMATION  

SciTech Connect

We report the first three-dimensional radiation magnetohydrodynamic (RMHD) simulations of protostellar collapse with and without Ohmic dissipation. We take into account many physical processes required to study star formation processes, including a realistic equation of state. We follow the evolution from molecular cloud cores until protostellar cores are formed with sufficiently high resolutions without introducing a sink particle. The physical processes involved in the simulations and adopted numerical methods are described in detail. We can calculate only about one year after the formation of the protostellar cores with our direct three-dimensional RMHD simulations because of the extremely short timescale in the deep interior of the formed protostellar cores, but successfully describe the early phase of star formation processes. The thermal evolution and the structure of the first and second (protostellar) cores are consistent with previous one-dimensional simulations using full radiation transfer, but differ considerably from preceding multi-dimensional studies with the barotropic approximation. The protostellar cores evolve virtually spherically symmetric in the ideal MHD models because of efficient angular momentum transport by magnetic fields, but Ohmic dissipation enables the formation of the circumstellar disks in the vicinity of the protostellar cores as in previous MHD studies with the barotropic approximation. The formed disks are still small (less than 0.35 AU) because we simulate only the earliest evolution. We also confirm that two different types of outflows are naturally launched by magnetic fields from the first cores and protostellar cores in the resistive MHD models.

Tomida, Kengo [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)] [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States); Tomisaka, Kohji [Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), Osawa, Mitaka, Tokyo 181-8588 (Japan)] [Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), Osawa, Mitaka, Tokyo 181-8588 (Japan); Matsumoto, Tomoaki [Faculty of Humanity and Environment, Hosei University, Fujimi, Chiyoda-ku, Tokyo 102-8160 (Japan)] [Faculty of Humanity and Environment, Hosei University, Fujimi, Chiyoda-ku, Tokyo 102-8160 (Japan); Hori, Yasunori; Saigo, Kazuya [National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan)] [National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan); Okuzumi, Satoshi [Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602 (Japan)] [Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602 (Japan); Machida, Masahiro N., E-mail: tomida@astro.princeton.edu, E-mail: tomisaka@th.nao.ac.jp, E-mail: yasunori.hori@nao.ac.jp, E-mail: saigo.kazuya@nao.ac.jp, E-mail: matsu@hosei.ac.jp, E-mail: okuzumi@nagoya-u.jp, E-mail: machida.masahiro.018@m.kyushu-u.ac.jp [Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581 (Japan)

2013-01-20T23:59:59.000Z

317

Efficient Conservative Numerical Schemes for 1D Nonlinear Spherical Diffusion Equations with Applications in Battery Modeling  

E-Print Network (OSTI)

Mathematical models of batteries which make use of the intercalation of a species into a solid phase need to solve the corresponding mass transfer problem. Because solving this equation can significantly add to the ...

Zeng, Yi

318

Radiation dosimeter  

DOE Patents (OSTI)

A radiation detector readout circuit is provided which produces a radiation dose-rate readout from a detector even though the detector output may be highly energy dependent. A linear charge amplifier including an output charge pump circuit amplifies the charge signal pulses from the detector and pumps the charge into a charge storage capacitor. The discharge rate of the capacitor through a resistor is controlled to provide a time-dependent voltage which when integrated provides an output proportional to the dose-rate of radiation detected by the detector. This output may be converted to digital form for readout on a digital display.

Fox, Richard J. (Oak Ridge, TN)

1983-01-01T23:59:59.000Z

319

Radiation dosimeter  

DOE Patents (OSTI)

A radiation detector readout circuit is provided which produces a radiation dose-rate readout from a detector even through the detector output may be highly energy dependent. A linear charge amplifier including an output charge pump circuit amplifies the charge signal pulses from the detector and pumps the charge into a charge storage capacitor. The discharge rate of the capacitor through a resistor is controlled to provide a time-dependent voltage which when integrated provides an output proportional to the dose-rate of radiation detected by the detector. This output may be converted to digital form for readout on a digital display.

Fox, R.J.

1981-09-01T23:59:59.000Z

320

Transfers | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Transfers Transfers Transfers Transfer means a change of an employee, from one Federal government branch (executive, legislative, judicial) to another or from one agency to another without a break in service of 1 full work day. Below are a few tips to better assist you when you transer agencies: If you have any dependents you must complete a standard Form 2809 during new employee orientation as this information does not transfer over automatically. You will not be able to change your coverage until open season or a life changing event occurs. At the time of new employee orientation you must provide your most recent leave and earning statement (LES) so that your leave may be updated accordingly. If you do not provide us with this document it will take approximately 6 weeks before your annual and sick leave is updated.

Note: This page contains sample records for the topic "radiative transfer equation" 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
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321

Data Transfer Examples  

NLE Websites -- All DOE Office Websites (Extended Search)

» Data Transfer Examples » Data Transfer Examples Data Transfer Examples Moving data to Projectb Projectb is where data should be written from jobs running on the cluster or Gpints. There are intermediate files or bad results from a run that didn't work out that don't need to be saved. By running these jobs in the SCRATCH areas, these files will be deleted for you by the puge. If you run in the SANDBOX, you will have to clean up after yourselves. Batch Scheduled Transfers Use any queues to schedule jobs that move data to Projectb. A basic transfer script is here: kmfagnan@genepool12 ~ $ cat data_to_projb.sh #!/bin/bash -l #$ -N data2projb /projectb/scratch// kmfagnan@genepool12 ~ $ qsub data_to_projb.sh

322

E-Print Network 3.0 - astrophysical ionizing radiation Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

Perturbations and level splittings 8-3 Ionization and the Saha equation 2. Textbook Radiative processes... the following chapters: Chapter 1 Basic concepts 1-1 Radiative flux and...

323

European Journal of Mechanics B/Fluids 22 (2003) 391408 Heat transfer and evaporation/condensation problems based  

E-Print Network (OSTI)

European Journal of Mechanics B/Fluids 22 (2003) 391­408 Heat transfer and evaporation-sphere interactions, that describe heat transfer and/or evaporation­ condensation between two parallel surfaces Elsevier SAS. All rights reserved. Keywords: Boltzmann equation; Rarefied gas dynamics; Heat transfer

Siewert, Charles E.

324

E-Print Network 3.0 - anthropogenic radiation sources Sample...  

NLE Websites -- All DOE Office Websites (Extended Search)

: Ts F Equation 1 The largest radiative forcing is due to the anthropogenic greenhouse effect... impact" of an anthropogenic perturbation. This is defined as the difference...

325

Transient hydrodynamic, heat and mass transfer in a salinity gradient solar pond: A numerical study  

Science Journals Connector (OSTI)

Abstract The impoverishment of our planet in non-renewable energies has incited researchers to design salinity gradient solar ponds to collect and store solar energy at a lower cost. It is in this context that the present research work lies to focus on the numerical study of the transient hydrodynamic, heat and mass transfer in a salinity gradient solar pond. The problem is tackled using the dimensionless governing equations of NavierStokes, thermal energy and mass transfer, which are solved numerically by finite-volume method to provide the temperature, concentration and velocity fields in transient regime. The pond is filled with salty water of various salinities to form three zones of salty water: Upper Convective Zone (UCZ), Non-Convective Zone (NCZ) and Lower Convective Zone (LCZ). To prevent convective movements induced by the internal heating of salty water due to solar radiation absorption, a salinity gradient is used in the solar pond. Representative results illustrating the influence of internal Rayleigh number on the thermal performance of the pond and the effect of the aspect ratio on the distribution of temperature and velocity fields in the salinity gradient solar pond (SGSP) are discussed. In addition, results for the transient average temperature of UCZ and LCZ are presented and discussed for various parametric conditions.

Ridha Boudhiaf; Mounir Baccar

2014-01-01T23:59:59.000Z

326

SWAMI II technology transfer plan  

SciTech Connect

Thousands of drums of radioactive/hazardous/mixed waste are currently stored at DOE sites throughout US; they are stored in warehouse facilities on an interim basis, pending final disposition. Recent emphasis on anticipated decommissioning of facilities indicates that many more drums of waste will be generated, requiring additional storage. Federal and state regulations dictate that hazardous waste covered by RCRA be inspected periodically for container degradation and to verify inventories. All known DOE waste storage facilities are currently inspected manually. A system to perform robotic inspection of waste drums is under development by the SRTC Robotics Group of WSRC; it is called the Stored Waste Autonomous Mobile Inspector (SWAMI). The first version, SWAMI I, was developed by the Savannah River Technology Center (SRTC) as a proof of principle system for autonomous inspection of drums in a warehouse. SWAMI I was based on the Transitions Research Corporation (TRC) HelpMate mobile robot. TRC modified the Helpmate to navigate in aisles of drums. SRTC added subsystems to SWAMI I to determine its position in open areas, read bar code labels on the drums up to three levels high, capture images of the drums and perform a radiation survey of the floor in the aisles. The radiation survey was based on SRTC patented technology first implemented on the Semi-Intelligent Mobile Observing Navigator (SIMON). The radiation survey is not essential for the inspection of drums, but is an option that can increase the utility and effectiveness of SWAMI in warehouses with radioactive and/or mixed waste. All the sensors on SWAMI I were fixed on the vehicle. From the success of SWAMI I, a second version, SWAMI II, was developed; it will be evaluated at Fernald and tested with two other mobile robots. Intent is to transfer the technology developed for SWAMI I and II to industry so that it can supply additional units for purchase for drum inspection.

Ward, C.R.; Peterson, K.D.; Harpring, L.J.; Immel, D.M.; Jones, J.D.; Mallet, W.R.

1995-12-31T23:59:59.000Z

327

Fireball during combustion of hydrocarbon fueld releases II. Thermal radiation  

Science Journals Connector (OSTI)

The processes of radiative heat transfer in a fireball which develops upon ignition of a cloud of hydrocarbon fuel near the Earths surface are simulated numerically. The emissive characteristics of combustion pr...

G. M. Makhviladze; J. P. Roberts; S. E. Yakush

328

Truncated Moment Formalism for Radiation Hydrodynamics in Numerical Relativity  

Science Journals Connector (OSTI)

......closure relation among the radiation stress tensor, energy density, and energy flux, and a variable Eddington factor, which works...Transfer (1984) 31:149. 15) Gonzalez M. , Audit E., Huynh P. Astron. Astrophys. (2007) 464......

Masaru Shibata; Kenta Kiuchi; Yu-ichiro Sekiguchi; Yudai Suwa

2011-06-01T23:59:59.000Z

329

Heat transfer due to stagnation point flow of a non-Newtonian fluid  

Science Journals Connector (OSTI)

Heat transfer analysis for steady, laminar flow of an incompressible, homogeneous, non-Newtonian fluid of second grade at a stagnation point...K, of the fluid. The energy equation is discretized using central ......

V. K. Garg

1994-01-01T23:59:59.000Z

330

Heat and mass transfer of a viscous heat generating fluid with Hall currents  

Science Journals Connector (OSTI)

A study of natural convection in hydrodynamic flows of a viscous heat generating fluid in the presence of Hall currents and ... out. The governing equations for the magnetohydrodynamic fluid flow and heat transfer

P. C. Ram; S. S. Singh; R. K. Jain

331

Computational Analysis of Fluid Flow and Heat Transfer Characteristics of Obliquely Impinging Slot Jets  

Science Journals Connector (OSTI)

The skin friction and heat transfer characteristics due to a slot jet impinging obliquely on a flat plate are presented. The boundary layer equations are solved by a finite difference marching technique, detai...

S. Jayaraj; Vijay K. Garg

1988-01-01T23:59:59.000Z

332

Second-order fluid flow past a stretching sheet with heat transfer  

Science Journals Connector (OSTI)

The heat transfer in the flow of a second-order fluid, obeying Coleman and Noll's constitutive equation...KC/v. The thermal boundary layer thickness decreases and the Nusselt numberNu x increases ...

N. M. Bujurke; S. N. Biradar; P. S. Hiremath

1987-07-01T23:59:59.000Z

333

Heat transfer in an MHD channel flow with boundary conditions of the third kind  

Science Journals Connector (OSTI)

The heat transfer equation for a two-dimensional magnetohydrodynamic channel flow has been solved using boundary conditions of the third kind considering a discontinuity in the ambient temperature. The bound...

Sergio Cuevas; Eduardo Ramos

1991-01-01T23:59:59.000Z

334

Appendix G. Radiation Appendix G. Radiation  

E-Print Network (OSTI)

-made sources. People are exposed to naturally occurring radiation constantly. For example, cosmic radiation of radiation and its effects on the environment and biological systems. Radiation comes from natural and humanAppendix G. Radiation #12;#12;Appendix G. Radiation This appendix presents basic facts about

Pennycook, Steve

335

The stochastic Mathieu's equation  

Science Journals Connector (OSTI)

...stochastic Mathieu's equation Francis J Poulin 1 * Glenn R Flierl 2 * Author for correspondence...1998). In geophysical fluid dynamics, Poulin et al. (2003) and Pedlosky Thomson...necessary condition (Van Kampen 2001; Poulin Scott 2005). A popular measure for the...

2008-01-01T23:59:59.000Z

336

Exact Lattice Boltzmann Equation  

Science Journals Connector (OSTI)

The lattice Boltzmann equation is derived from the Bhatnagar-Gross-Krook kinetic equation using the Euler-Maclaurin integration formula. Unlike previous attempts to connect the lattice Boltzmann method with the kinetic theory, the result is free of any relaxation-type approximation. It shows that the conventional lattice Bhatnagar-Gross-Krook simulations of hydrodynamics belong to a parameter domain which is disconnected from the kinetic theory domain.

F. Bsch and I. V. Karlin

2013-08-26T23:59:59.000Z

337

Design/installation and structural integrity assessment under the Federal Facility Agreement for Bethel Valley Low-Level Waste Collection and Transfer System upgrade for Building 2026 (High Radiation Level Analytical Laboratory) and Building 2099 (Monitoring and Control Station) at Oak Ridge National Laboratory  

SciTech Connect

This document presents a Design/Installation and Structural Integrity Assessment for a replacement tank system for portions of the Bethel Valley Low Level Waste (LLW) System, located at the Oak Ridge Reservation, Oak Ridge, Tennessee. This issue of the assessment covers the design aspects of the replacement tank system, and certifies that the design has sufficient structural integrity and is acceptable for the storing or treating of hazardous and/or radioactive substances. The present issue identifies specific activities that must be completed during the fabrication, installation, and testing of the replacement tank system in order to provide assurance that the final installation complies with governing requirements. Portions of the LLW system are several decades old, or older, and do not comply with current environmental protection regulations. Several subsystems of the LLW system have been designated to receive a state-of-the-art replacement and refurbishment. One such subsystem serves Building 2026, the High Radiation Level Analytical Laboratory. This assessment focuses on the scope of work for the Building 2026 replacement LLW Collection and Transfer System, including the provision of a new Monitoring and Control Station (Building 2099) to receive, store, and treat (adjust pH) low level radioactive waste.

Not Available

1994-10-01T23:59:59.000Z

338

Modelling of Heat Transfer in Single Crystal Growth  

E-Print Network (OSTI)

An attempt is made to review the heat transfer and the related problems encountered in the simulation of single crystal growth. The peculiarities of conductive, convective and radiative heat transfer in the different melt, solution, and vapour growth methods are discussed. The importance of the adequate description of the optical crystal properties (semitransparency, specular reflecting surfaces) and their effect on the heat transfer is stresses. Treatment of the unknown phase boundary fluid/crystal as well as problems related to the assessment of the quality of the grown crystals (composition, thermal stresses, point defects, disclocations etc.) and their coupling to the heat transfer/fluid flow problems is considered. Differences between the crystal growth simulation codes intended for the research and for the industrial applications are indicated. The problems of the code verification and validation are discussed; a brief review of the experimental techniques for the study of heat transfer and flow structu...

Zhmakin, Alexander I

2014-01-01T23:59:59.000Z

339

Technology Transfer Reporting Form | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Transfer Reporting Form Technology Transfer Reporting Form Technology Transfer Reporting Form More Documents & Publications Technology Partnership Ombudsman - Roles,...

340

VOLUNTARY LEAVE TRANSFER PROGRAM  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

VOLUNTARY LEAVE TRANSFER PROGRAM VOLUNTARY LEAVE TRANSFER PROGRAM (Eligible employees are listed at the end of this narrative) Under the Voluntary Leave Transfer Program you can apply, based on a medical emergency, to receive annual leave donated by other employees. A medical emergency is generally defined as a medical condition of the employee or family member that is likely to keep you (the employee) away from work and cause a loss of pay of at least 24 hours. You are required to submit an Office of Personnel Management (OPM) Form 630, Application to Become A Leave Recipient Under the Voluntary Leave Transfer Program, through your supervisor to be considered for the program. The application must include an explanation of the reason the donation is needed (including a brief description of the

Note: This page contains sample records for the topic "radiative transfer equation" 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.


341

Technology Transfer Summit  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Agenda as of April 9, 2012 Agenda as of April 9, 2012 Technology Transfer Summit April 16, 2012 IMC - Trinity Ballroom 4 8:00 - 8:10 Welcome & Introduction Pete Tseronis, DOE Chief Technology Officer 8:10 - 8:50 Accelerating Transfer Within an Innovation Ecosystem Debra M. Amidon, Founder and Chief Strategist, ENTOVATION International, and Author, The Innovation SuperHighway 8:50 - 9:20 Tech Transfer - Predicaments, Perplexities, and Possible Panaceas Rex Northen, Executive Director, Cleantech Open 9:20 - 9:50 A Systems Approach to Innovation Mike Schwenk, Vice President and Director Technology Deployment and Outreach, Pacific Northwest National Laboratory (PNNL) 9:50 - 10:15 DOE's Online Tech Transfer Ecosystem - aka...Stop Building Moai! Robert Bectel, Senior Policy Advisor / Chief Technology Officer

343

VOLUNTARY LEAVE TRANSFER PROGRAM  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

VOLUNTARY LEAVE TRANSFER PROGRAM LIST Name Organization Fairbanks, Mary H. AU Garnett-Harris, Deborah A. AU James, Debra A. AU Johnston, Robyne AU May, Melanie P. AU Pickens,...

344

Smoothness- transferred random field  

E-Print Network (OSTI)

We propose a new random field (RF) model, smoothness-transfer random field (ST-RF) model, for image modeling. In the objective function of RF models, smoothness energy is defined with compatibility function to capture the ...

Wei, Donglai

2013-01-01T23:59:59.000Z

345

Technology Transfer Office November 2009  

E-Print Network (OSTI)

Technology Transfer Office November 2009 INVENTION AGREEMENT In consideration of my employment in writing to Dartmouth through the Technology Transfer Office any such discovery or invention and identify

Myers, Lawrence C.

346

Sandia National Laboratories: technology transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

technology transfer Federal Laboratory Consortium Regional Technology-Transfer Awards Salute Innovation, Commercialization at Sandia On September 23, 2014, in Capabilities, Carbon...

347

Ames Lab 101: Technology Transfer  

SciTech Connect

Ames Laboratory Associate Laboratory Director, Sponsored Research Administration, Debra Covey discusses technology transfer. Covey also discusses Ames Laboratory's most successful transfer, lead-free solder.

Covey, Debra

2010-01-01T23:59:59.000Z

348

Ombuds Services for Technology Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

Tech Transfer Ombuds Ombuds Services for Technology Transfer Committed to the fair and equitable treatment of all employees, contractors, and persons doing business with the...

349

Heat Transfer Characteristics of a Generalized Divided Flow Heat Exchanger  

E-Print Network (OSTI)

The concept of a "Divided-flow" heat exchanger is generalized by locating the shell inlet (or outlet) nozzle off-center such that the two shell sub-streams are unequal and traverse unequal flow paths. The governing equations for heat transfer...

Singh, K. P.

1979-01-01T23:59:59.000Z

350

Radiation receiver  

DOE Patents (OSTI)

The apparatus for collecting radiant energy and converting same to alternate energy form includes a housing having an interior space and a radiation transparent window allowing, for example, solar radiation to be received in the interior space of the housing. Means are provided for passing a stream of fluid past said window and for injecting radiation absorbent particles in said fluid stream. The particles absorb the radiation and because of their very large surface area, quickly release the heat to the surrounding fluid stream. The fluid stream particle mixture is heated until the particles vaporize. The fluid stream is then allowed to expand in, for example, a gas turbine to produce mechanical energy. In an aspect of the present invention properly sized particles need not be vaporized prior to the entrance of the fluid stream into the turbine, as the particles will not damage the turbine blades. In yet another aspect of the invention, conventional fuel injectors are provided to inject fuel into the fluid stream to maintain the proper temperature and pressure of the fluid stream should the source of radiant energy be interrupted. In yet another aspect of the invention, an apparatus is provided which includes means for providing a hot fluid stream having hot particles disbursed therein which can radiate energy, means for providing a cooler fluid stream having cooler particles disbursed therein, which particles can absorb radiant energy and means for passing the hot fluid stream adjacent the cooler fluid stream to warm the cooler fluid and cooler particles by the radiation from the hot fluid and hot particles. 5 figs.

Hunt, A.J.

1983-09-13T23:59:59.000Z

351

Antecedents of knowledge transfer from consultants to clients in enterprise system implementations  

Science Journals Connector (OSTI)

Enterprise resource planning (ERP) systems and other complex information systems represent critical organizational resources. For such systems, firms typically use consultants to aid in the implementation process. Client firms expect consultants to transfer ... Keywords: ERP, consultants, enterprise systems, implementation, knowledge transfer, partial least squares, structural equation modeling

Dong-Gil Ko; Laurie J. Kirsch; William R. King

2005-03-01T23:59:59.000Z

352

Motion-induced radiation from electrons moving in Maxwell's fish-eye  

E-Print Network (OSTI)

In \\u{C}erenkov radiation and transition radiation, evanescent wave from motion of charged particles transfers into radiation coherently. However, such dissipative motion-induced radiations require particles to move faster than light in medium or to encounter velocity transition to pump energy. Inspired by a method to detect cloak by observing radiation of a fast-moving electron bunch going through it by Zhang {\\itshape et al.}, we study the generation of electron-induced radiation from electrons' interaction with Maxwell's fish-eye sphere. Our calculation shows that the radiation is due to a combination of \\u{C}erenkov radiation and transition radiation, which may pave the way to investigate new schemes of transferring evanescent wave to radiation.

Liu, Yangjie

2013-01-01T23:59:59.000Z

353

Proceedings of Heat Transfer 2003: ASME Summer Heat Transfer Conference  

E-Print Network (OSTI)

Proceedings of Heat Transfer 2003: ASME Summer Heat Transfer Conference Las Vegas, Nevada, USA July 21-23, 2003 HT2003-47449 HEAT TRANSFER FROM A MOVING AND EVAPORATING MENISCUS ON A HEATED SURFACE meniscus with complete evaporation of water without any meniscus break-up. The experimental heat transfer

Kandlikar, Satish

354

Relation between clinical and laboratory parameters with radiation dose rates from patients receiving iodine-131 therapy for thyroid carcinoma  

Science Journals Connector (OSTI)

......educate every patient on radiation safety procedures for the dosage...improvised containers; the safety officer transferred...origin of emission, and radiation detection survey metre...significant. SPSS for Windows software package (Release 11......

Isa Neshandar Asli; Nastaran Baharfard; Babak Shafiei; Faraj Tabei; Hamid Javadi; Mohammad Seyedabadi; Iraj Nabipour; Majid Assadi

2010-03-01T23:59:59.000Z

355

Nuclear equation of state  

Science Journals Connector (OSTI)

We present a discussion of the equation of state of cold nuclear matter predicted by our recently completed Thomas-Fermi model. The equation is in the form of a three-term polynomial in the cube root of the density, with coefficients that are functions of the relative neutron excess ?. The coefficients are tabulated in the range from ?=0 (standard nuclear matter) to ?=1 (neutron matter), making it very easy to calculate, for a given ?, the pressure, compressibility, saturation binding, and any other property of the Thomas-Fermi equation of state. We discuss the empirical information concerning abnormal densities and large neutron excess that is contained in the measured values of the surface energy, surface diffuseness, and the neutron skin.

W. D. Myers and W. J. ?wia?tecki

1998-06-01T23:59:59.000Z

356

Information Equation of State  

E-Print Network (OSTI)

Landauer's principle is applied to information in the universe. Once stars began forming, the increasing proportion of matter at high stellar temperatures compensated for the expanding universe to provide a near constant information energy density. The information equation of state was close to the dark energy value, w = -1, for a wide range of redshifts, 10> z >0.8, over one half of cosmic time. A reasonable universe information bit content of only 10^87 bits is sufficient for information energy to account for all dark energy. A time varying equation of state with a direct link between dark energy and matter, and linked to star formation in particular, is clearly relevant to the cosmic coincidence problem.In answering the "Why now?" question we wonder "What next?" as we expect the information equation of state to tend towards w = 0 in the future.

Paul Gough

2007-09-05T23:59:59.000Z

357

Energy transfer up-conversion in Tm3+ -doped silica fibre  

E-Print Network (OSTI)

1 Energy transfer up-conversion in Tm3+ - doped silica fibre D. A. Simpson, G. W. Baxter and S. F responsible for the up-conversion: excited state absorption and energy transfer up-conversion. The decay equations, the energy transfer up- conversion process (3 F4,3 F43 H4,3 H6) is established at Tm2O3

Paris-Sud XI, Université de

358

A new asymptotic preserving scheme based on micro-macro formulation for linear kinetic equations in the diffusion limit  

E-Print Network (OSTI)

of the particles is small, a macroscopic description--such as diffusion equation in neutron transport and radiative transport equations. It is based on a decomposition of the distribution function into equilibrium and non. transport equations, diffusion limit, asymptotic preserving schemes, stiff terms AMS subject classifications

Mieussens, Luc

359

Lattice Boltzmann equation hydrodynamics  

Science Journals Connector (OSTI)

By inserting position and time dependent source or forcing terms into the microscopic evolution equation of a lattice Boltzmann fluid and treating the generalized scheme within the usual Chapman-Enskog methodology, we show that the emergent dynamics of the lattice fluid may be usefully transformed. Our method of adjustment is demonstrated by implementing the cylindrical polar coordinate form of the continuity and momentum equations on a rectangular lattice and generating results for pipe flow. With straightforward systematic adjustment of the simulation, our approach produces results in excellent agreement with theory.

I. Halliday; L. A. Hammond; C. M. Care; K. Good; A. Stevens

2001-06-28T23:59:59.000Z

360

POSITION DESCRIPTION 2012 TRANSFER MENTOR  

E-Print Network (OSTI)

interest in the Transfer Mentor position with Orientation and Transition Programs' (OTP) Transfer Mentoring Program. The Transfer Mentor (TM) is a member of the Orientation and Transition Programs' staff to CSU including (but not limited to) helping transfer students explore study skills, time management

Note: This page contains sample records for the topic "radiative transfer equation" 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

Technology transfer @ VUB Hugo Loosvelt  

E-Print Network (OSTI)

13/12/2012 Technology transfer @ VUB Hugo Loosvelt #12;VUB in Brussels www.vub.ac.be including or conclude licensing contracts #12;Technology transfer TTI assists academics to realise knowledge transfer by needed for R&D collaboration, licensing and spin-out company formation Technology transfer is the process

Steels, Luc

362

E-Print Network 3.0 - absorption tissue distribution Sample Search...  

NLE Websites -- All DOE Office Websites (Extended Search)

tomography with the frequency domain equation of radiative transfer Summary: of radiative transfer. Transport properties of tissue become significant when strong light...

363

Importance of Compton scattering for radiation spectra of isolated neutron stars with weak magnetic fields  

E-Print Network (OSTI)

Emergent model spectra of neutron star atmospheres are widely used to fit the observed soft X-ray spectra of different types of isolated neutron stars. We investigate the effect of Compton scattering on the emergent spectra of hot (T_eff > 10^6 K) isolated neutron stars with weak magnetic fields. In order to compute model atmospheres in hydrostatic and radiative equilibrium we solve the radiation transfer equation with the Kompaneets operator. We calculate a set of models with effective temperatures in the range 1 - 5 * 10^6 K, with two values of surface gravity (log g = 13.9 and 14.3) and different chemical compositions. Radiation spectra computed with Compton scattering are softer than those computed without Compton scattering at high energies (E > 5 keV) for light elements (H or He) model atmospheres. The Compton effect is more significant in H model atmospheres and models with low surface gravity. The emergent spectra of the hottest (T_eff > 3 * 10^6 K) model atmospheres can be described by diluted blackbody spectra with hardness factors ~ 1.6 - 1.9. Compton scattering is less important in models with solar abundance of heavy elements.

V. Suleimanov; K. Werner

2007-02-15T23:59:59.000Z

364

Radiation Protection Act (Pennsylvania)  

Energy.gov (U.S. Department of Energy (DOE))

This Act combines the radiation safety provisions of The Atomic Energy Development and Radiation Control Act and the Environmental Radiation Protection Act, and empowers the Department of...

365

7th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics  

E-Print Network (OSTI)

i #12;ExHFT-7 7th World Conference on Experimental Heat Transfer, Fluid Mechanics Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics 28 June ­ 03 July 2009, Krakow environment of high surface and volumetric heating, intense radiation fluxes, strong 3-component magnetic

Abdou, Mohamed

366

POISSON'S PARTIAL DIFFERENCE EQUATION  

Science Journals Connector (OSTI)

......concerning the steadyflowof electric currents in conducting...the conservation of electric current, we get a partial...element of which has resistance R, with current I entering...integrations are all elementary. 3. The equation in...we can speak of the resistance between a grid point......

H. DAVIES

1955-01-01T23:59:59.000Z

367

Low Dose Radiation Research Program: Research Institutions  

NLE Websites -- All DOE Office Websites (Extended Search)

Institutions Institutions Lovelace Respiratory Research Institute Biological Bases for Radiation Adaptive Responses in the Lung-Lovelace Respiratory Research Institute, Albuquerque, NM USA Contact: Dr. Bobby R. Scott Program Objective Our research focuses on elucidating the biological bases for radiation adaptive responses in the lung and for suppressing lung cancer, and to use the knowledge gained to produce an improved systems-biology-based, risk model for lung cancer induction by low-dose, low linear-energy-transfer (LET) radiation. Research was initiated in October 2009. This research should help foster a new era of low-dose radiation risk/benefit assessment. It will have important implications for possible use of low-dose diagnostic radiation (e.g., X-rays) in cancer therapy. It

368

NREL: Technology Transfer - Webmaster  

NLE Websites -- All DOE Office Websites (Extended Search)

Webmaster Webmaster To report any problems on or ask a question about the NREL Technology Transfer Web site, you may contact the Webmaster using the online form below. If you have a question or concern that's not related to this Web site, please see our list of contacts for assistance. To contact the Webmaster, please provide your name, e-mail address, and message below. When you are finished, click "Send Message." NOTE: If you enter your e-mail address incorrectly, we will be unable to reply. Your name: Your email address: Your message: Send Message Printable Version Technology Transfer Home About Technology Transfer Technology Partnership Agreements Licensing Agreements Nondisclosure Agreements Research Facilities Commercialization Programs Success Stories News

369

NREL: Technology Transfer - Ombuds  

NLE Websites -- All DOE Office Websites (Extended Search)

Technology Transfer Ombuds Technology Transfer Ombuds NREL's Technology Transfer Ombuds offers an informal process to help resolve issues and concerns regarding the laboratory's technology partnership, patent, and licensing activities. As a designated neutral party, our ombuds provides confidential, resolution-focused services. Through the ombuds process, we encourage collaborative techniques such as mediation to facilitate the speedy and low-cost resolution of complaints and disputes, when appropriate. The NREL Ombuds does not: Handle contract negotiation or other legal issues Act as a decision maker or draw conclusions Investigate or make formal recommendations on findings of fact. The ombuds also does not replace, override, or influence formal review or appeal mechanisms, or serve as an intermediary when legal action is

370

Partnerships and Technology Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

Cooperative Research and Development Agreement Cooperative Research and Development Agreement visualization scientist A Cooperative Research and Development Agreement (CRADA) is a mechanism whereby non-federal entities (industry, universities, non-profits, etc.) can collaborate with federal laboratories on research and development projects. CRADAs are specifically technology transfer agreements; technologies developed under CRADAs are expected to be transferred to the private sector for commercial exploitation, either by the non-federal partner or another licensee of such technologies. CRADAs were authorized by the Stevenson-Wydler Technology Innovation Act of 1980 (Public Law 96-480); the authority for government-owned, contractor-operated laboratories such as ORNL to enter into CRADAs was granted by the National Competitiveness Technology Transfer Act of 1989

371

Technology Transfer: Available Technologies  

NLE Websites -- All DOE Office Websites (Extended Search)

Software and Information Technologies Software and Information Technologies Algorithm for Correcting Detector Nonlinearites Chatelet: More Accurate Modeling for Oil, Gas or Geothermal Well Production Collective Memory Transfers for Multi-Core Processors Energy Efficiency Software EnergyPlus:Energy Simulation Software for Buildings Tools, Guides and Software to Support the Design and Operation of Energy Efficient Buildings Flexible Bandwidth Reservations for Data Transfer Genomic and Proteomic Software LABELIT - Software for Macromolecular Diffraction Data Processing PHENIX - Software for Computational Crystallography Vista/AVID: Visualization and Allignment Software for Comparative Genomics Geophysical Software Accurate Identification, Imaging, and Monitoring of Fluid Saturated Underground Reservoirs

372

Radiation protection: Natural radiation risks  

Science Journals Connector (OSTI)

... radiation to which humans are exposed consists of four components - cosmic, gamma, internal, radon. The relative contribution that each makes to the sum is shown in the chart. ... but exposure of the whole body to terrestrial gamma rays and of the lungs to radon daughters are influenced by the nature and location of housing. Gamma rays are emitted ...

M. C. O'Riordan

1983-11-17T23:59:59.000Z

373

Quasipotential Equation Corresponding to the Relativistic Eikonal Approximation  

Science Journals Connector (OSTI)

A three-dimensional Lippmann-Schwinger-type equation for the elastic scattering amplitude and the corresponding homogeneous Schrdinger equation for the two-particle bound states are studied. The potential is defined as an infinite power series in the coupling constant which fits the perturbative expansion of the on-energy-shell scattering amplitude. The approximate equation obtained by keeping only the lowest-order term in the potential is local and has the following properties: (i) The scattering amplitude yields the relativistic eikonal approximation for large energies or small exchanged mass and momentum transfer; (ii) for the Coulomb problem the approximate equation is exactly soluble and leads to a relativistic Balmer formula including the fine-structure splitting.

I. T. Todorov

1971-05-15T23:59:59.000Z

374

Simulating corrosion-erosion mass transfer using plaster models  

SciTech Connect

Corrosion-erosion is a term that covers a variety of processes leading to the removal of metal in low-carbon steel piping conveying water or steam/water mixtures at a temperature of 150 {+-} 50{degree}C. One of the most important of these processes is corrosion-dissolution. This is most likely to occur where disturbances or fittings cause local high velocities and thus high mass transfer coefficients. The wear equation, which requires the local mass transfer coefficient, is presented. This paper presents a way of determining the local mass transfer coefficient. This paper reports measurements of both local and nominal mass transfer coefficients on a plaster model of a defective weld in a pipe. Welds are particularly important because they are often the place where wear is the greatest and the pipe is most severely thinned.

Griffith, P.; de Freitas, G.

1989-01-01T23:59:59.000Z

375

SRNL - Technology Transfer - Ombudsman  

NLE Websites -- All DOE Office Websites (Extended Search)

Ombudsman Ombudsman Ombudsman Program Policy The Department of Energy and its management and operating contractors (M & O Contractors) engaging in technology partnership activities, share a mutual objective to ensure complete fairness in the transfer of federally funded technologies into the marketplace for the benefit of the U.S. economy. This includes an interest in open lines of communication and the early identification of issues, complaints and disputes between contractors and their existing or potential partners. The Technology Transfer Ombudsman Program provides an independent point of contact for concerns about technology transfer i SRS Sign ssues, complaints and disputes. The mission of the Ombudsman Program is to elevate to the appropriate SRNS officials the information needed to identify and resolve problems thereby improving satisfaction with SRNS practices and reducing the occasion for formal disputes and litigation. The Ombudsman will not be involved in the merits of cases that are the subject of ongoing dispute resolution or litigation, or investigation incidents thereto. The Ombudsman is not established to be a super-administrator, re-doing what specialized officials have already done. Rather, the Ombudsman is to ensure that appropriate SRNS officials consider all pertinent information when deciding the company's position on a technology transfer complaint. To request forms or acquire additional information contact: Michael Wamstad, 803-725-3751 or mike.wamstad@srs.gov.

376

Technology Transfer Overview  

Energy.gov (U.S. Department of Energy (DOE))

DOE's capabilities, and the innovations it supports, help ensure the country's role as a leader in science and technology. In particular, technology transfer supports the maturation and deployment of DOE discoveries, providing ongoing economic, security and environmental benefits for all Americans.

377

Feed tank transfer requirements  

SciTech Connect

This document presents a definition of tank turnover; DOE responsibilities; TWRS DST permitting requirements; TWRS Authorization Basis (AB) requirements; TWRS AP Tank Farm operational requirements; unreviewed safety question (USQ) requirements; records and reporting requirements, and documentation which will require revision in support of transferring a DST in AP Tank Farm to a privatization contractor for use during Phase 1B.

Freeman-Pollard, J.R.

1998-09-16T23:59:59.000Z

378

Radiative Heat Transfer in Enhanced Hydrogen Outgassing of Glass  

E-Print Network (OSTI)

Vie, and . Ulleberg, Hydrogen Production and Storage - R&Dfor production. The procedure for hydrogen storage and

Kitamura, Rei; Pilon, Laurent

2009-01-01T23:59:59.000Z

379

Uncertainty of microwave radiative transfer computations in rain  

E-Print Network (OSTI)

retrieval using new thermodynamic observations; and 3) to investigate the characteristics of four different RT codes. Firstly, a plane-parallel RT Model (RTM) of n layers in light rainfall was used for the analytical and computational derivation...

Hong, Sung Wook

2009-06-02T23:59:59.000Z

380

Radiative Heat Transfer in Enhanced Hydrogen Outgassing of Glass  

E-Print Network (OSTI)

and J.A. Lercher, Hydrogen Storage in Microspheres - FinalHydrogen Program Review Hydrogen Storage, U.S. DepartmentAn overview of hydrogen storage methods, in Hydro- gen

Kitamura, Rei; Pilon, Laurent

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

Influence of Infrared Radiation on Attic Heat Transfer  

E-Print Network (OSTI)

roof temperatures. It was found that a radiant barrier such as aluminum foil can reduce the heat flux significantly. Experimental results were compared to a Three-Region approximate solution developed at Oak Ridge National Laboratories (ORNL). The model...

Katipamula, S.; Turner, W. D.; Murphy, W. E.; O'Neal, D. L.

1985-01-01T23:59:59.000Z

382

Journal of Quantitative Spectroscopy & Radiative Transfer 103 (2007) 168174  

E-Print Network (OSTI)

.05.010 ?Corresponding author. Tel.: +1 303 871 2897; fax: +1 303 871 4405. E-mail addresses: agoldman@du.edu, goldman

383

Validation of the community radiative transfer model Shouguo Ding a  

E-Print Network (OSTI)

changing weather conditions, a rational and computationally efficient method to use satellite cloud of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, USA b Satellite Meteorology and Climatology Division, Center for Satellite Applications and Research, NOAA/NESDIS, Camp Springs, MD 20746, USA

Li, Jun

384

Radiative Heat Transfer in Enhanced Hydrogen Outgassing of Glass  

E-Print Network (OSTI)

samples are exposed to an incandescent lamp. Acknowledgmentin a furnace or by an incandescent lamp. It was observedwhen heated by an incandescent lamp than within furnace.

Kitamura, Rei; Pilon, Laurent

2009-01-01T23:59:59.000Z

385

Radiative Heat Transfer in Enhanced Hydrogen Outgassing of Glass  

E-Print Network (OSTI)

Energy, O?ce of Hydrogen, Fuel Cells and Infrastructurefuel cells, (d) the large amount of energy required to compress hydrogen

Kitamura, Rei; Pilon, Laurent

2009-01-01T23:59:59.000Z

386

Radiative Heat Transfer in Enhanced Hydrogen Outgassing of Glass  

E-Print Network (OSTI)

transport in a machinable glass-ceramic, Journal of Non-in soda-lime-silicate glasses by reaction with hydrogen,1971. [16] I. Fanderlik, Glass Science and Technology, Vol.

Kitamura, Rei; Pilon, Laurent

2009-01-01T23:59:59.000Z

387

Journal of Quantitative Spectroscopy & Radiative Transfer 104 (2007) 384399  

E-Print Network (OSTI)

). #12;where I is the intensity in the ^s-direction and c is the speed of light in the medium. The linear and scattering coefficients as well as the scattering phase function consist of measuring

Pilon, Laurent

388

Brookhaven National Laboratory technology transfer report, fiscal year 1986  

SciTech Connect

An increase in the activities of the Office of Research and Technology Applications (ORTA) is reported. Most of the additional effort has been directed to the regional electric utility initiative, but intensive efforts have been applied to the commercialization of a compact synchrotron storage ring for x-ray lithography applications. At least six laboratory technologies are reported as having been transferred or being in the process of transfer. Laboratory accelerator technology is being applied to study radiation effects, and reactor technology is being applied for designing space reactors. Technologies being transferred and emerging technologies are described. The role of the ORTA and the technology transfer process are briefly described, and application assessment records are given for a number of technologies. A mini-incubator facility is also described. (LEW)

Not Available

1986-01-01T23:59:59.000Z

389

Mass Transfer between Double White Dwarfs  

E-Print Network (OSTI)

Three periodically variable stars have recently been discovered (V407 Vul, P=9.5 min; ES Cet, P=10.3 min; RX J0806.3+1527, P=5.3 min) with properties that suggest that their photometric periods are also their orbital periods, making them the most compact binary stars known. If true, this might indicate that close, detached, double white dwarfs are able to survive the onset of mass transfer caused by gravitational wave radiation and emerge as the semi-detached, hydrogen-deficient stars known as the AM CVn stars. The accreting white dwarfs in such systems are large compared to the orbital separations. This has two effects: first it makes it likely that the mass transfer stream can hit the accretor directly, and second it causes a loss of angular momentum from the orbit which can destabilise the mass transfer unless the angular momentum lost to the accretor can be transferred back to the orbit. The effect of the destabilisation is to reduce the number of systems which survive mass transfer by as much as one hundred-fold. In this paper we analyse this destabilisation and the stabilising effect of a dissipative torque between the accretor and the binary orbit. We obtain analytic criteria for the stability of both disc-fed and direct impact accretion, and carry out numerical integrations to assess the importance of secondary effects, the chief one being that otherwise stable systems can exceed the Eddington accretion rate. We show that to have any effect upon survival rates, the synchronising torque must act on a timescale of order 1000 years or less. If synchronisation torques are this strong, then they will play a significant role in the spin rates of white dwarfs in cataclysmic variable stars as well.

T. R. Marsh; G. Nelemans; D. Steeghs

2003-12-22T23:59:59.000Z

390

Exact solution to the Landau-Lifshitz equation in a constant electromagnetic field  

E-Print Network (OSTI)

We are interested in the motion of a classical charge acted upon an external constant electromagnetic field where the back reaction of the particle's own field is taken into account. The Landau-Lifshitz approximation to the Lorentz-Abraham-Dirac equation is solved exactly and in closed form. It is shown that the ultrarelativistic limit of the Landau-Lifshitz equation for a radiating charge is the equation for eigenvalues and eigenvectors of the external electromagnetic field tensor.

Yurij Yaremko

2014-12-04T23:59:59.000Z

391

A Coupled Model for Laplace's Tidal Equations in a Fluid with One Horizontal Dimension and Variable Depth  

Science Journals Connector (OSTI)

Tidetopography interactions dominate the transfer of tidal energy from large to small scales. At present, it is poorly understood how low-mode internal tides reflect and scatter along the continental margins. Here, the coupling equations for ...

Samuel M. Kelly; Nicole L. Jones; Jonathan D. Nash

2013-08-01T23:59:59.000Z

392

FACILITY SURVEY & TRANSFER Facility Survey & Transfer Overview  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

SURVEY & TRANSFER SURVEY & TRANSFER Facility Survey & Transfer Overview Transfer Activities Checklist Pre-Survey Information Request Survey Report Content Detailed Walkdown Checklist Walkdown Checklist Clipboard Aids S & M Checklist Survey Report Example - Hot Storage Garden Survey Report Example - Tritium System Test Assembly Survey Report Example - Calutron Overview As DOE facilities become excess, many that are radioactively and/or chemically contaminated will become candidate for transfer to DOE-EM for deactivation and decommissioning. Requirements and guidance for such transfers are contained in:  DOE Order 430.1B Chg. 2, REAL PROPERTY & ASSET MANAGEMENT  DOE Guide 430.1-5, TRANSITION IMPLEMENTATION GUIDE The transfer process is illustrated in the Transfer Process figure. The purpose here is to provide examples of methods and

393

Heat Transfer -2 A pure platinum wire with diameter D = 3 mm and length L = 20 mm is placed outside on a day when air temperature  

E-Print Network (OSTI)

Heat Transfer - 2 A pure platinum wire with diameter D = 3 mm and length L = 20 mm is placed outside on a day when air temperature T = 10o C. The heat transfer coefficient at the wire's surface h equation that includes all heat transfer mechanisms involved in this problem. Write this energy balance

Virginia Tech

394

Approved Module Information for ME3013, 2014/5 Module Title/Name: Heat Transfer and Turbomachinery Module Code: ME3013  

E-Print Network (OSTI)

Approved Module Information for ME3013, 2014/5 Module Title/Name: Heat Transfer and Turbomachinery Outcomes: The students will have developed an understanding of a range of advanced heat transfer and turbo-machinery. * Unsteady heat transfer Turbomachinery: * Momentum and energy equations for turbo-machines * Radial, axial

Neirotti, Juan Pablo

395

Urban Sewage Delivery Heat Transfer System (2): Heat Transfer  

E-Print Network (OSTI)

The thimble delivery heat-transfer (TDHT) system is one of the primary modes to utilize the energy of urban sewage. Using the efficiency-number of transfer units method ( ), the heat-transfer efficiencies of the parallel-flow and reverse-flow TDTH...

Zhang, C.; Wu, R.; Li, X.; Li, G.; Zhuang, Z.; Sun, D.

2006-01-01T23:59:59.000Z

396

Heat Transfer and Convection Currents  

Science Journals Connector (OSTI)

...October 1965 research-article Heat Transfer and Convection Currents D. C...convection in a medium with internal heat generation is discussed semi-quantitatively...States English United Kingdom 1966 Heat transfer and convection currents Tozer D...

1965-01-01T23:59:59.000Z

397

Faculty Positions Heat Transfer and  

E-Print Network (OSTI)

Faculty Positions Heat Transfer and Thermal/Energy Sciences Naval Postgraduate School Monterey-track faculty position at the assistant professor level in the areas of Heat Transfer and Thermal/Fluid Sciences

398

Phase-Transfer-Catalyzed Reductions  

Science Journals Connector (OSTI)

Phase-transfer catalysis (PTC) procedures that have been developed for use with sodium borohydride, lithium aluminum hydride, and several other reducing agents involving anion transfer to organic media are des...

Charles M. Starks; Charles L. Liotta; Marc E. Halpern

1994-01-01T23:59:59.000Z

399

Technology Transfer Reports  

NLE Websites -- All DOE Office Websites (Extended Search)

Advanced Research Projects Agency-Energy (ARPA-E) Advanced Research Projects Agency-Energy (ARPA-E) Oil & Gas Technology Transfer Initiatives USEFUL LINKS Association of University Technology Managers (AUTM) Federal Laboratory Consortium (FLC) FLC Technology Locator Feedback Contact us about Tech Transfer: Mary.McManmon@science.doe.gov Mary McManmon, 202-586-3509 link to Adobe PDF Reader link to Adobe Flash player Reports Navigate Home About Us Contact Information Hide Thumbs First Previous Pause Next Last Set Speed Slideshow speed: 5 seconds Move Autoinduction system New Image Set Autoinduction Autoinduction System The award winning Overnight Express(tm) Autoinduction System developed at BNL simplifies protein production in the widely used T7 gene expression system. Decontamination Foam-based decontamination

400

NREL: Technology Transfer - Events  

NLE Websites -- All DOE Office Websites (Extended Search)

Events Events February 2014 NASEO Energy Outlook Conference February 4 - 7, 2014 Washington , DC Add to calendar Printable Version Technology Transfer Home About Technology Transfer Technology Partnership Agreements Licensing Agreements Nondisclosure Agreements Research Facilities Commercialization Programs Success Stories News Contacts Did you find what you needed? Yes 1 No 0 Thank you for your feedback. Would you like to take a moment to tell us how we can improve this page? Submit We value your feedback. Thanks! We've received your feedback. Something went wrong. Please try again later. NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. NREL U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Alliance for Sustainable Energy, LLC

Note: This page contains sample records for the topic "radiative transfer equation" 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

Efficient Data Transfer Protocols  

NLE Websites -- All DOE Office Websites (Extended Search)

Efficient Efficient Data Transfer Protocols for Big Data Brian Tierney ∗ , Ezra Kissel † , Martin Swany † , Eric Pouyoul ∗ ∗ Lawrence Berkeley National Laboratory, Berkeley, CA 94270 † School of Informatics and Computing, Indiana University, Bloomington, IN 47405 Abstract-Data set sizes are growing exponentially, so it is important to use data movement protocols that are the most efficient available. Most data movement tools today rely on TCP over sockets, which limits flows to around 20Gbps on today's hardware. RDMA over Converged Ethernet (RoCE) is a promising new technology for high-performance network data movement with minimal CPU impact over circuit-based infrastructures. We compare the performance of TCP, UDP, UDT, and RoCE over high latency 10Gbps and 40Gbps network paths, and show that RoCE-based data transfers can fill a 40Gbps path using much less CPU than other protocols.

402

Technology Transfer: Site Map  

NLE Websites -- All DOE Office Websites (Extended Search)

Site Map Site Map About Us About Technology Transfer Contact Us Available Technologies Advanced Materials Biofuels Biotechnology and Medicine Developing World Energy Environmental Technologies Imaging and Lasers Ion Sources and Beam Technologies Nanotechnology and Microtechnology Software and Information Technology For Industry Licensing Overview Frequently Asked Questions Partnering with Berkeley Lab Licensing Interest Form Receive New Tech Alerts For Researchers What You Need to Know and Do The Tech Transfer Process Forms Record of Invention (Word doc -- please do not use earlier PDF version of the form) Software Disclosure and Abstract (PDF, use Adobe Acrobat or Adobe Reader 9 and up ONLY to complete the form) Policies Conflict of Interest Outside Empolyment Export Control FAQs for Researchers

403

Feed tank transfer requirements  

SciTech Connect

This document presents a definition of tank turnover. Also, DOE and PC responsibilities; TWRS DST permitting requirements; TWRS Authorization Basis (AB) requirements; TWRS AP Tank Farm operational requirements; unreviewed safety question (USQ) requirements are presented for two cases (i.e., tank modifications occurring before tank turnover and tank modification occurring after tank turnover). Finally, records and reporting requirements, and documentation which will require revision in support of transferring a DST in AP Tank Farm to a privatization contractor are presented.

Freeman-Pollard, J.R.

1998-09-16T23:59:59.000Z

404

Measuring Information Transfer  

Science Journals Connector (OSTI)

An information theoretic measure is derived that quantifies the statistical coherence between systems evolving in time. The standard time delayed mutual information fails to distinguish information that is actually exchanged from shared information due to common history and input signals. In our new approach, these influences are excluded by appropriate conditioning of transition probabilities. The resulting transfer entropy is able to distinguish effectively driving and responding elements and to detect asymmetry in the interaction of subsystems.

Thomas Schreiber

2000-07-10T23:59:59.000Z

405

Natural and Radiation Carcinogenesis in Man. III. Radiation Carcinogenesis  

Science Journals Connector (OSTI)

...mice. NATURAL AND RADIATION CARCINOGENESIS IN MAN. 3. RADIATION CARCINOGENESIS. | Journal Article | Japan Neoplasms etiology Neoplasms, Radiation-Induced Radiation Genetics | JAPAN NEOPLASM ETIOLOGY NEOPLASMS, RADIATION-INDUCED RADIATION...

1965-01-01T23:59:59.000Z

406

Application of Improved Radiation Modeling to General Circulation Models  

SciTech Connect

This research has accomplished its primary objectives of developing accurate and efficient radiation codes, validating them with measurements and higher resolution models, and providing these advancements to the global modeling community to enhance the treatment of cloud and radiative processes in weather and climate prediction models. A critical component of this research has been the development of the longwave and shortwave broadband radiative transfer code for general circulation model (GCM) applications, RRTMG, which is based on the single-column reference code, RRTM, also developed at AER. RRTMG is a rigorously tested radiation model that retains a considerable level of accuracy relative to higher resolution models and measurements despite the performance enhancements that have made it possible to apply this radiation code successfully to global dynamical models. This model includes the radiative effects of all significant atmospheric gases, and it treats the absorption and scattering from liquid and ice clouds and aerosols. RRTMG also includes a statistical technique for representing small-scale cloud variability, such as cloud fraction and the vertical overlap of clouds, which has been shown to improve cloud radiative forcing in global models. This development approach has provided a direct link from observations to the enhanced radiative transfer provided by RRTMG for application to GCMs. Recent comparison of existing climate model radiation codes with high resolution models has documented the improved radiative forcing capability provided by RRTMG, especially at the surface, relative to other GCM radiation models. Due to its high accuracy, its connection to observations, and its computational efficiency, RRTMG has been implemented operationally in many national and international dynamical models to provide validated radiative transfer for improving weather forecasts and enhancing the prediction of global climate change.

Michael J Iacono

2011-04-07T23:59:59.000Z

407

Low Dose Radiation Research Program: Radiation-Induced Nuclear Factor kB  

NLE Websites -- All DOE Office Websites (Extended Search)

Radiation-Induced Nuclear Factor kB mediates survival advantage by Radiation-Induced Nuclear Factor kB mediates survival advantage by Telomerase Activation. Authors: Natarajan M.,1 Mohan S.,2 Pandeswara, S.L.,1 and Herman T.S.1 Institutions: Departments of 1Radiation Oncology and 2Pathology, The University of Texas Health Science Center, San Antonio, Texas Activation of NF-kB in response to low doses of ionizing radiation was first shown in our laboratory. Although studies have shown that NF-kB plays an important role in anti-apoptotic function, little has been done to understand the molecular link between the activation of NF-kB and cellular outcome such as enhanced cell survival after low dose low-linear transfer (LET) radiation. Because upregulation of telomerase activity is associated with longevity and allows cells to escape from senescence, we hypothesize

408

Adaptors for radiation detectors  

DOE Patents (OSTI)

Described herein are adaptors and other devices for radiation detectors that can be used to make accurate spectral measurements of both small and large bulk sources of radioactivity, such as building structures, soils, vessels, large equipment, and liquid bodies. Some exemplary devices comprise an adaptor for a radiation detector, wherein the adaptor can be configured to collimate radiation passing through the adapter from an external radiation source to the radiation detector and the adaptor can be configured to enclose a radiation source within the adapter to allow the radiation detector to measure radiation emitted from the enclosed radiation source.

Livesay, Ronald Jason

2014-04-22T23:59:59.000Z

409

Radiation Safety  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Brotherhood of Locomotive Brotherhood of Locomotive Engineers & Trainmen Scott Palmer BLET Radiation Safety Officer New Hire Training New Hire study topics * GCOR * ABTH * SSI * Employee Safety * HazMat * Railroad terminology * OJT * 15-week class * Final test Hazardous Materials * Initial new-hire training * Required by OSHA * No specified class length * Open book test * Triennial module Locomotive Engineer Training A little bit older...a little bit wiser... * Typically 2-4 years' seniority * Pass-or-get-fired promotion * Intensive program * Perpetually tested to a higher standard * 20 Weeks of training * 15 of that is OJT * General Code of Operating Rules * Air Brake & Train Handling * System Special Instructions * Safety Instructions * Federal Regulations * Locomotive Simulators * Test Ride * Pass test with 90% Engineer Recertification

410

Standard electrode potential, Tafel equation, and the solvation thermodynamics  

Science Journals Connector (OSTI)

Equilibrium in the electronic subsystem across the solution-metal interface is considered to connect the standard electrode potential to the statistics of localized electronic states in solution. We argue that a correct derivation of the Nernst equation for the electrode potential requires a careful separation of the relevant time scales. An equation for the standard metal potential is derived linking it to the thermodynamics of solvation. The AndersonNewns model for electronic delocalization between the solution and the electrode is combined with a bilinear model of solute-solvent coupling introducing nonlinear solvation into the theory of heterogeneous electron transfer. We therefore are capable of addressing the question of how nonlinear solvation affects electrochemical observables. The transfer coefficient of electrode kinetics is shown to be equal to the derivative of the free energy or generalized force required to shift the unoccupied electronic level in the bulk. The transfer coefficient thus directly quantifies the extent of nonlinear solvation of the redox couple. The current model allows the transfer coefficient to deviate from the value of 0.5 of the linear solvation models at zero electrode overpotential. The electrode current curves become asymmetric in respect to the change in the sign of the electrode overpotential.

Dmitry V. Matyushov

2009-01-01T23:59:59.000Z

411

Standard electrode potential, Tafel equation, and the solvation thermodynamics  

SciTech Connect

Equilibrium in the electronic subsystem across the solution-metal interface is considered to connect the standard electrode potential to the statistics of localized electronic states in solution. We argue that a correct derivation of the Nernst equation for the electrode potential requires a careful separation of the relevant time scales. An equation for the standard metal potential is derived linking it to the thermodynamics of solvation. The Anderson-Newns model for electronic delocalization between the solution and the electrode is combined with a bilinear model of solute-solvent coupling introducing nonlinear solvation into the theory of heterogeneous electron transfer. We therefore are capable of addressing the question of how nonlinear solvation affects electrochemical observables. The transfer coefficient of electrode kinetics is shown to be equal to the derivative of the free energy, or generalized force, required to shift the unoccupied electronic level in the bulk. The transfer coefficient thus directly quantifies the extent of nonlinear solvation of the redox couple. The current model allows the transfer coefficient to deviate from the value of 0.5 of the linear solvation models at zero electrode overpotential. The electrode current curves become asymmetric in respect to the change in the sign of the electrode overpotential.

Matyushov, Dmitry V. [Center for Biological Physics, Arizona State University, P.O. Box 871504, Tempe, Arizona 85287-1504 (United States)

2009-06-21T23:59:59.000Z

412

Wireless Power Transfer  

ScienceCinema (OSTI)

Wireless Power Transfer is an innovative approach using magnetic resonance coupling of air core transformers designed for today's growing plug-in electric vehicle market. This technology can provide a convenient, safe and flexible means to charge electric vehicles under stationary and dynamic conditions. Plug-in Electric Vehicles (PEV) are burdened by the need for cable and plug charger, galvanic isolation of the on-board electronics, bulk and cost of this charger and the large energy storage system (ESS) packs needed. With a system where you have to physically plug in there are a number of occasions where the owner could very well forget to charge the vehicle. For stationary applications (like charging of a PHEV at home), ORNL's innovative wireless power transfer technology adds a convenience factor compared to actually plugging in which will mean that the vehicle will have a full charge every morning. Electric vehicle charging must be safe, compact and efficient in order to be convenient for customers. By reconfiguring the transformer and altering the resonance frequency, energy is transferred to the battery with lower energy losses and with fewer demands on the primary circuit by the rest of the transformer system. The ORNL discovery shows that sufficient power for the battery can be transferred from the primary to secondary circuits without significant energy losses if the operating frequency is set at 50% to 95% of the resonance frequency of the circuit. The electrical power is then transmitted to the chargeable battery, which is electrically coupled to the secondary circuit through the air core transformer. Some advantages include: Reduced energy losses during transfer of energy to the battery; A charge potential that is relatively unaffected by up to 25% misalignment of vehicle; and Other receiving components draw less power from the primary circuit. These advantages allow wireless power technology applications to expand at the workplace and beyond as the demand for EV rises. For vehicles that operate over a fixed route such as busses and shuttle vehicles, Wireless Power Transfer (WPT) means that a smaller battery pack can be used. In the traditional system, the battery pack is designed to accommodate the needs of the entire route or shift. With WPT the battery can be downsized because it can be charged when the vehicle stops on its route (a rental car shuttle bus, for example, can charge when it waits in the terminal and again when it waits at the rental car place. Thus the battery only needs enough charge to get to the next stop. This decrease in battery size means significant cost savings to electrify the vehicle. This technology enables efficient "opportunity charging stations" for predefined routes and planned stops reducing down time. Charging can occur in minutes. This improvement also eliminates the harmful emissions that occur in garages while buses are at idle during charging. In larger cities, dynamic charging offers an even greater impact utilizing existing infrastructure. As vehicles travel along busy freeways and interstate systems, wireless charging can occur while the vehicle is in motion. With this technology a vehicle essentially has unlimited electric range while using a relatively small battery pack. In-motion charging stations use vehicle sensors to alert the driver. Traveling at normal speeds, sensors establish in-motion charging. WPT transmit pads sequentially energize to the negotiated power level based on vehicle speed and its requested charging energy. Lower power when vehicle speed is slow and much higher power for faster moving vehicles. Vehicle to Infrastructure communications (V2I) coordinates WPT charging level according to on-board battery pack state-of-charge. V2I activates the roadway transmit pads placing them in standby mode and negotiates charging fee based on prevailing grid rate and vehicle energy demand. Dynamic charging would allow electricity to supply a very large fraction of the energy for the transportation sector and reduce greatly petroleum consump

None

2013-11-19T23:59:59.000Z

413

A phase-field method for 3D simulation of two-phase heat transfer , H. Babaee a  

E-Print Network (OSTI)

the efficiency of the new method in simulating 3D multi-phase convective heat transfer on stationary gridsA phase-field method for 3D simulation of two-phase heat transfer X. Zheng a , H. Babaee a , S Keywords: Spectral element Non-moving grid Cahn­Hilliard equation Large thermal conductivity ratio a b

Dong, Suchuan "Steven"

414

Coherent Synchrotron Radiation: Theory and Simulations.  

SciTech Connect

The physics of coherent synchrotron radiation (CSR) emitted by ultra-relativistic electron bunches, known since the last century, has become increasingly important with the development of high peak current free electron lasers and shorter bunch lengths in storage rings. Coherent radiation can be described as a low frequency part of the familiar synchrotron radiation in bending magnets. As this part is independent of the electron energy, the fields of different electrons of a short bunch can be in phase and the total power of the radiation will be quadratic with the number of electrons. Naturally the frequency spectrum of the longitudinal electron distribution in a bunch is of the same importance as the overall electron bunch length. The interest in the utilization of high power radiation from the terahertz and far infrared region in the field of chemical, physical and biological processes has led synchrotron radiation facilities to pay more attention to the production of coherent radiation. Several laboratories have proposed the construction of a facility wholly dedicated to terahertz production using the coherent radiation in bending magnets initiated by the longitudinal instabilities in the ring. Existing synchrotron radiation facilities also consider such a possibility among their future plans. There is a beautiful introduction to CSR in the 'ICFA Beam Dynamics Newsletter' N 35 (Editor C. Biscari). In this paper we recall the basic properties of CSR from the theory and what new effects, we can get from the precise simulations of the coherent radiation using numerical solutions of Maxwell's equations. In particular, transverse variation of the particle energy loss in a bunch, discovered in these simulations, explains the slice emittance growth in bending magnets of the bunch compressors and transverse de-coherence in undulators. CSR may play same the role as the effect of quantum fluctuations of synchrotron radiation in damping rings. It can limit the minimum achievable emittance in the synchrotron light sources for short bunches.

Novokhatski, Alexander; /SLAC

2012-03-29T23:59:59.000Z

415

Manipulator mounted transfer platform  

DOE Patents (OSTI)

A transfer platform for the conveyance of objects by a manipulator includes a bed frame and saddle clamp secured along an edge of the bed frame and adapted so as to secure the bed frame to a horizontal crosspiece of the manipulator. The platform may thus move with the manipulator in a reciprocal linear path defined by a guide rail. A bed insert may be provided for the support of conveyed objects and a lifting bail may be provided to permit the manipulator arm to install the bed frame upon the crosspiece under remote control.

Dobbins, James C. (Idaho Falls, ID); Hoover, Mark A. (Idaho Falls, ID); May, Kay W. (Idaho Falls, ID); Ross, Maurice J. (Pocatello, ID)

1990-01-01T23:59:59.000Z

416

The Schroedinger equation with friction from the quantum trajectory perspective  

SciTech Connect

Similarity of equations of motion for the classical and quantum trajectories is used to introduce a friction term dependent on the wavefunction phase into the time-dependent Schroedinger equation. The term describes irreversible energy loss by the quantum system. The force of friction is proportional to the velocity of a quantum trajectory. The resulting Schroedinger equation is nonlinear, conserves wavefunction normalization, and evolves an arbitrary wavefunction into the ground state of the system (of appropriate symmetry if applicable). Decrease in energy is proportional to the average kinetic energy of the quantum trajectory ensemble. Dynamics in the high friction regime is suitable for simple models of reactions proceeding with energy transfer from the system to the environment. Examples of dynamics are given for single and symmetric and asymmetric double well potentials.

Garashchuk, Sophya; Dixit, Vaibhav; Gu Bing; Mazzuca, James [Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208 (United States)

2013-02-07T23:59:59.000Z

417

Design considerations for a ceramic fabric radiator  

SciTech Connect

The design of an Advanced Ceramic Fabric (ACF) thermal management device for use in both interplanetary and near-earth space must consider several important aspects of the environment. First, the radiation field at various locations is dominated by a proton component which deposits its energy on the surface of the device. Second, the ACF materials, as well as pressure liner materials, must also be compatible with the working fluids selected for the system. Third, the fluid dynamics and heat transfer characteristics of this device should be adequately characterized. With the proper consideration of materials and operating conditions, the Bubble Membrane Radiator (BMR) may be utilized for several advanced space missions. 17 refs.

Pauley, K.A.; Webb, B.J. (Pacific Northwest Lab., Richland, WA (USA)); Klein, A.C. (Oregon State Univ., Corvallis, OR (USA). Dept. of Nuclear Engineering)

1990-04-01T23:59:59.000Z

418

NREL: Technology Transfer - NREL, Collaborators Complete Gearbox...  

NLE Websites -- All DOE Office Websites (Extended Search)

technical innovation within the global wind energy industry. Printable Version Technology Transfer Home About Technology Transfer Technology Partnership Agreements Licensing...

419

Near-field heat transfer between gold nanoparticle arrays  

SciTech Connect

The radiative heat transfer between gold nanoparticle layers is presented using the coupled dipole method. Gold nanoparticles are modelled as effective electric and magnetic dipoles interacting via electromagnetic fluctuations. The effect of higher-order multipoles is implemented in the expression of electric polarizability to calculate the interactions at short distances. Our findings show that the near-field radiation reduces as the radius of the nanoparticles is increased. Also, the magnetic dipole contribution to the heat exchange becomes more important for larger particles. When one layer is displayed in parallel with respect to the other layer, the near-field heat transfer exhibits oscillatory-like features due to the influence of the individual nanostructures. Further details about the effect of the nanoparticles size are also discussed.

Phan, Anh D., E-mail: anhphan@mail.usf.edu [Department of Physics, University of South Florida, Tampa, Florida 33620 (United States); Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Hanoi 10000 (Viet Nam); Phan, The-Long, E-mail: ptlong2512@yahoo.com [Department of Physics, Chungbuk National University, Cheongju 361-763 (Korea, Republic of); Woods, Lilia M. [Department of Physics, University of South Florida, Tampa, Florida 33620 (United States)

2013-12-07T23:59:59.000Z

420

Aachen Institute for Advanced Study in Computational Engineering Science Preprint: AICES-2010/12-2  

E-Print Network (OSTI)

. Introduction The radiative transfer equation is a basic model for the transport of non-interacting particles09. Key words and phrases. linear Boltzmann equation, neutron transport equation, radiative transfer/12-2 16/December/2010 A Mixed Variational Framework for the Radiative Transfer Equation H. Egger and M

Rheinisch-Westfälische Technische Hochschule Aachen (RWTH)

Note: This page contains sample records for the topic "radiative transfer equation" 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

Polarization transfer NMR imaging  

DOE Patents (OSTI)

A nuclear magnetic resonance (NMR) image is obtained with spatial information modulated by chemical information. The modulation is obtained through polarization transfer from a first element representing the desired chemical, or functional, information, which is covalently bonded and spin-spin coupled with a second element effective to provide the imaging data. First and second rf pulses are provided at first and second frequencies for exciting the imaging and functional elements, with imaging gradients applied therebetween to spatially separate the nuclei response for imaging. The second rf pulse is applied at a time after the first pulse which is the inverse of the spin coupling constant to select the transfer element nuclei which are spin coupled to the functional element nuclei for imaging. In a particular application, compounds such as glucose, lactate, or lactose, can be labeled with .sup.13 C and metabolic processes involving the compounds can be imaged with the sensitivity of .sup.1 H and the selectivity of .sup.13 C.

Sillerud, Laurel O. (Los Alamos, NM); van Hulsteyn, David B. (Santa Fe, NM)

1990-01-01T23:59:59.000Z

422

MODELING OF HEAT TRANSFER IN ROOMS IN THE MODELICA  

NLE Websites -- All DOE Office Websites (Extended Search)

MODELING MODELING OF HEAT TRANSFER IN ROOMS IN THE MODELICA "BUILDINGS" LIBRARY Michael Wetter, Wangda Zuo, Thierry Stephane Nouidui Simulation Research Group, Building Technologies Department Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory Berkeley, CA 94720, USA ABSTRACT This paper describes the implementation of the room heat transfer model in the free open-source Modelica "Buildings" library. The model can be used as a single room or to compose a multizone building model. We discuss how the model is de- composed into submodels for the individual heat transfer phenomena. We also discuss the main physical assumptions. The room model can be parameterized to use di↵erent modeling assump- tions, leading to linear or non-linear di↵erential algebraic systems of equations. We present nu- merical experiments that show

423

On the Classical Radiation of Accelerated Electrons  

Science Journals Connector (OSTI)

This paper is concerned with the properties of the radiation from a high energy accelerated electron, as recently observed in the General Electric synchrotron. An elementary derivation of the total rate of radiation is first presented, based on Larmor's formula for a slowly moving electron, and arguments of relativistic invariance. We then construct an expression for the instantaneous power radiated by an electron moving along an arbitrary, prescribed path. By casting this result into various forms, one obtains the angular distribution, the spectral distribution, or the combined angular and spectral distributions of the radiation. The method is based on an examination of the rate at which the electron irreversibly transfers energy to the electromagnetic field, as determined by half the difference of retarded and advanced electric field intensities. Formulas are obtained for an arbitrary charge-current distribution and then specialized to a point charge. The total radiated power and its angular distribution are obtained for an arbitrary trajectory. It is found that the direction of motion is a strongly preferred direction of emission at high energies. The spectral distribution of the radiation depends upon the detailed motion over a time interval large compared to the period of the radiation. However, the narrow cone of radiation generated by an energetic electron indicates that only a small part of the trajectory is effective in producing radiation observed in a given direction, which also implies that very high frequencies are emitted. Accordingly, we evaluate the spectral and angular distributions of the high frequency radiation by an energetic electron, in their dependence upon the parameters characterizing the instantaneous orbit. The average spectral distribution, as observed in the synchrotron measurements, is obtained by averaging the electron energy over an acceleration cycle. The entire spectrum emitted by an electron moving with constant speed in a circular path is also discussed. Finally, it is observed that quantum effects will modify the classical results here obtained only at extraordinarily large energies.

Julian Schwinger

1949-06-15T23:59:59.000Z

424

Nuclear radiation electronic gear  

Science Journals Connector (OSTI)

Nuclear radiation electronic gear ... Examines the line of nuclear radiation instrumentation offered by Nuclear-Chicago Corporation and Victoreen Instrument Company. ... Nuclear / Radiochemistry ...

S. Z. Lewin

1961-01-01T23:59:59.000Z

425

Radiation Control (Virginia)  

Energy.gov (U.S. Department of Energy (DOE))

The Department of Health is responsible for regulating radiation and radioactive materials in the Commonwealth of Virginia. Although the Department's Radiation Control Program primarily focuses on...

426

Solar radiation on variously oriented sloping surfaces  

SciTech Connect

Monthly average daily irradiation on surfaces tilted towards the equator and also inclined at various azimuth angles are estimated for two locations in Lesotho and the results are presented. The isotropic model suggested by Liu and Jordan (Trans. of Ashrae, 526, 1962) along with the modified equation of Klein (Solar Energy, 19, 4, 1977) are employed for the estimation purposes. Surface orientations are selected at three inclinations for six different azimuth angles. Conclusions are reached for optimum tilt and orientation for summer, winter and annual collection. Total annual radiation values are computed for all the slopes and orientations.

Gopinathan, K.K. (National Univ. of Lesotho, Roma (South Africa))

1991-01-01T23:59:59.000Z

427

Scattering by an electromagnetic radiation field  

E-Print Network (OSTI)

Motion of test particles in the gravitational field associated with an electromagnetic plane wave is investigated. The interaction with the radiation field is modeled by a force term {\\it \\`a la} Poynting-Robertson entering the equations of motion given by the 4-momentum density of radiation observed in the particle's rest frame with a multiplicative constant factor expressing the strength of the interaction itself. Explicit analytical solutions are obtained. Scattering of fields by the electromagnetic wave, i.e., scalar (spin 0), massless spin $\\frac12$ and electromagnetic (spin 1) fields, is studied too.

Donato Bini; Andrea Geralico

2014-08-21T23:59:59.000Z

428

Low Dose Radiation Program: Radiation Biology and the Radiation Research  

NLE Websites -- All DOE Office Websites (Extended Search)

Biology and the Radiation Research Program Biology and the Radiation Research Program The Department of Energy (DOE) and its predecessor organizations, Energy Research and Development Agency (ERDA) and Atomic Energy Commission (AEC), always have been concerned about the health effects of ionizing radiation. Extensive research has been conducted under their sponsorship at all levels of biological organization from molecules to man. Over the past 60 years, studies using every type of radiation source have included exposure to both external radiation sources and to internally deposited radioactive materials. These exposures used different dose patterns and distributions delivered over a wide range of experimental times. This extensive research provided the basis for the new Low Dose Radiation Research Program, linking

429

Technology Transfer Reporting Form  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

form is to be completed by the TTO for individual inquiry/case activity during the quarter as required form is to be completed by the TTO for individual inquiry/case activity during the quarter as required by the Technology Transfer Commercialization Act of 2000. Mouse over definitions and descriptions appear over text/check boxes where appropriate. After completing this form, click on the submit button. *If you have no TTO activity for the quarter, please fill in your name, FY and quarter, lab or facility and check the box "No Quarterly Activity". Initial Ombuds Contact: ____________________ Type: Inquiry Case Ombuds Name: __________________________ Time Spent: (Hours) ______________ Final Ombuds Involvement: _________________ Laboratory or Facility: AMES ANL BNL LBNL INL KCP LANL NREL LLNL NBL NETL PNNL NNSS ORNL PXSO SRNL

430

NREL: Technology Transfer - Contacts  

NLE Websites -- All DOE Office Websites (Extended Search)

Contacts Contacts Here you'll find contact information and resources to help answer any questions you may have about NREL's technology transfer and commercialization opportunities. Agreement for Commercializing Technology For more information about NREL's agreements for commercializing technology, contact Anne Miller, 303-384-7353. Financial and Funding Assistance NREL does not provide financial or funding assistance for any research projects. If you're a startup company, small business, or an inventor, visit the following Web sites: Grants.gov Small Business Administration. Industry Growth Forum Visit the NREL Industry Growth Forum website or contact Kate Cheesbrough for more information about this event. Investors and Entrepreneurs For more information about NREL's Innovation and Entrepreneurship Center,

431

Transfer and Archive Data  

NLE Websites -- All DOE Office Websites (Extended Search)

Data Management Please remove ALL data from /house! Do you still have data in /house/homedirs? Do you know if you have data in /house/homedirs? Please check now and make a plan for moving that data to the archiver or one of the NERSC file systems (for more information on these filesystems go to File storage and I/O). Moving data from house to DnA The DnA file system is primarily for finished projects, data that is ready to be archived, or data that is shared between groups. It is mounted read-only on the cluster, but you can write to directories on this file system in a few ways: Data Transfer Nodes until December 1, 2013 (examples here) xfer queue on the Genepool cluster until December 1, 2013 (examples here) Moving data from house to Projectb Projectb is where compute jobs run and output both intermediate files as

432

Frame Heat Transfer Research  

NLE Websites -- All DOE Office Websites (Extended Search)

Developing Low-Conductance Window Frames: Capabilities and Developing Low-Conductance Window Frames: Capabilities and Limitations of Current Window Heat Transfer Design Tools Arild Gustavsen 1,* , Dariush Arasteh 2 , Bjørn Petter Jelle 3,4 , Charlie Curcija 5 and Christian Kohler 2 1 Department of Architectural Design, History and Technology, Norwegian University of Science and Technology, Alfred Getz vei 3, NO-7491 Trondheim, Norway 2 Windows and Daylighting Group, Lawrence Berkeley National Laboratory, 1 Cyclotron Road Mail Stop 90R3111, Berkeley, CA 94720- 8134, USA 3 Department of Civil and Transport Engineering, Norwegian University of Science and Technology, Høgskoleringen 7A, NO-7491 Trondheim, Norway 4 Department of Building Materials and Structures, SINTEF Building and Infrastructure, Høgskoleringen 7B,NO-7465 Trondheim, Norway

433

Working with SRNL - Technology Transfer  

NLE Websites -- All DOE Office Websites (Extended Search)

SRNL GO Tech Briefs Contacts Ombudsman Tech Home SRNL Home Working with SRNL Technology Transfer 2014 SRNL Research and Technology Recognition Reception Click to view the 2014...

434

Education and Research Transfer Program  

NLE Websites -- All DOE Office Websites (Extended Search)

Transferring and donating education-related Federal equipment to the education and non-profit science and research sectors. Skip Navigation Links Home Newsroom About INL Careers...

435

Phase-Transfer-Catalyzed Oxidations  

Science Journals Connector (OSTI)

Phase-transfer catalysis (PTC) offers many excellent opportunities for conducting oxidation reactions using inexpensive primary oxidants such as oxygen, sodium hypochlorite, hydrogen peroxide, electrooxidation...

Charles M. Starks; Charles L. Liotta; Marc E. Halpern

1994-01-01T23:59:59.000Z

436

Study of cloud properties from single-scattering, radiative forcing, and retrieval perspectives  

E-Print Network (OSTI)

This dissertation reports on three different yet related topics in light scattering computation, radiative transfer simulation, and remote sensing implementation, regarding the cloud properties and the retrieval of cloud properties from satellite...

Lee, Yong-Keun

2009-06-02T23:59:59.000Z

437

Biological Basis for Radiation Adaptive Responses that Protect Against  

NLE Websites -- All DOE Office Websites (Extended Search)

Basis for Radiation Adaptive Responses that Protect Against Basis for Radiation Adaptive Responses that Protect Against Bronchial Epithelial Cell Transformation Wenshu Chen Lovelace Respiratory Research Institute Abstract The major hypothesis in this project is that low-dose, low linear-energy-transfer (LET) radiation stimulates an adaptive response that protects cells from neoplastic transformation involving modulation of paracrine factors (e.g., cytokines), cell survival/death signaling pathways, and reprogramming of the epigenome. To test this hypothesis, a validated, sensitive in vitro transformation model and a media transfer method were used to study the mechanisms of low-LET gamma radiation activated natural protection (ANP) against chemical carcinogen-induced bronchial cell transformation. Immortalized human bronchial epithelial cell

438

ARM - Evaluation Product - Radiatively Important Parameters Best Estimate  

NLE Websites -- All DOE Office Websites (Extended Search)

ProductsRadiatively Important Parameters Best ProductsRadiatively Important Parameters Best Estimate (RIPBE) Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Radiatively Important Parameters Best Estimate (RIPBE) 2002.03.01 - 2007.06.30 Site(s) SGP General Description The Radiatively Important Parameters Best Estimate (RIPBE) VAP combines multiple input datastreams, each with their own temporal and vertical resolution, to create a complete set of radiatively important parameters on a uniform vertical and temporal grid with quality control and source information for use as input to a radiative transfer model. One of the main drivers for RIPBE was to create input files for the BroadBand Heating Rate Profiles (BBHRP) VAP, but we also envision use of RIPBE files for user-run

439

of MATHEMATICS AcademyofSciences  

E-Print Network (OSTI)

by the radiative transfer equation: a linear transport equation with a (non linear) source term and the fluid-radiation-Stokes- Fourier system coupled to a stationary radiative transfer equation. 1 Introduction We revisit a model interaction appears through radiative sources in the momentum and energy equations.The system under study

Krejcí, Pavel

440

radiation.p65  

Office of Legacy Management (LM)

5 5 United States Department of Energy This fact sheet explains the potential health hazards associated with the radioactive decay of uranium and other radioactive elements found in ore and mill tailings. Potential Health Hazards of Radiation Man-made sources of radiation, most notably from medical uses and consumer products, contribute to the remaining radiation dose that individuals receive. A few household products, including smoke detectors, micro- wave ovens, and color televisions, emit small amounts of radiation. For most people, the benefits from using such products far outweigh the radiation risks. Radiation Dose Radiation is measured in various units. Individuals who have been exposed to radiation have received a radiation dose. Radiation dose to people is expressed in

Note: This page contains sample records for the topic "radiative transfer equation" 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

Photon rockets and gravitational radiation  

E-Print Network (OSTI)

The absence of gravitational radiation in Kinnersley's ``photon rocket'' solution of Einstein's equations is clarified by studying the mathematically well-defined problem of point-like photon rockets in Minkowski space (i.e. massive particles emitting null fluid anisotro\\-pically and accelerating because of the recoil). We explicitly compute the (uniquely defined) {\\it linearized} retarded gravitational waves emitted by such objects, which are the coherent superposition of the gravitational waves generated by the motion of the massive point-like rocket and of those generated by the energy-momentum distribution of the photon fluid. In the special case (corresponding to Kinnersley's solution) where the anisotropy of the photon emission is purely dipolar we find that the gravitational wave amplitude generated by the energy-momentum of the photons exactly cancels the usual $1/r$ gravitational wave amplitude generated by the accelerated motion of the rocket. More general photon anisotropies would, however, generate genuine gravitational radiation at infinity. Our explicit calculations show the compatibility between the non-radiative character of Kinnersley's solution and the currently used gravitational wave generation formalisms based on post-Minkowskian perturbation theory.

T. Damour

1994-12-21T23:59:59.000Z

442

Comparisons Between Different Forward Models For Light Transport In Tissues  

E-Print Network (OSTI)

The radiative transfer equation to describe the laser radiation transport in scattering, absorbing and emitting the radiative heat transfer equation, which can be applied to almost all the electromagnetic radiation. The diffusion approximation method is controlled by a differential equation, which is derived from radiative

Guo, Zhixiong "James"

443

Coherence Transfer in Magnetic Fields  

Science Journals Connector (OSTI)

Some results recently discussed by Chiu for interatomic coherence transfer are shown to have a simple physical interpretation, to be independent of collision model assumed, and to be applicable also to intra -atomic coherence transfer. A derivation using density matrices is presented which takes both depolarizing collisions and backtransfer of coherence into account.

W. E. Baylis

1973-03-01T23:59:59.000Z

444

BNL Photo- and Radiation Chemistry Group Members  

NLE Websites -- All DOE Office Websites (Extended Search)

and Radiation Chemistry Group and Radiation Chemistry Group Chemistry Department, Brookhaven National Laboratory Staff Diane E. Cabelli Redox chemistry of high oxidation state transition-metal complexes, particularly CuIII, MnIII/MnIV; Superoxide chemistry in aqueous solutions: dismutation of superoxide radical; copper-zinc superoxide dismutase and model compounds. Andrew R. Cook Excited state structure, dynamics and electron transfer reactions of a variety of organic radicals in both low temperature matrices and room temperature solutions using radiation chemistry techniques. Robert A. Crowell Ultrafast reaction phenomena. Etsuko Fujita Photochemistry of transition-metal complexes, small molecule activation by high- and low-oxidation state metal complexes; and biomimetic chemistry of porphyrins and enzymes.

445

Radiative Heating in Underexplored Bands Campaign (RHUBC)  

NLE Websites -- All DOE Office Websites (Extended Search)

Bands Campaign (RHUBC) D. Turner and E. Mlawer RHUBC Breakout Session 2008 ARM Science Team Meeting 13 March, 2008 Norfolk, Virginia Motivation * Radiative heating/cooling in the mid-troposphere modulate the vertical motions of the atmosphere - This heating/cooling occurs primarily in water vapor absorption bands that are opaque at the surface * Approximately 40% of the OLR comes from the far-IR * Until recently, the observational tools were not available to evaluate the accuracy of the far-IR radiative transfer models - Spectrally resolved far-IR radiances, accurate PWV * Need to validate both clear sky (WV) absorption and cirrus scattering properties in these normally opaque bands Scientific Objectives * Conduct clear sky radiative closure studies in order to reduce uncertainties

446

Argonne TDC: Material Transfer Agreements  

NLE Websites -- All DOE Office Websites (Extended Search)

Material Transfer Agreements Material Transfer Agreements Materials produced by researchers at Argonne National Laboratory are often of interest to the private sector. Depending on the circumstances under which the material was developed, such material may be transferred to industry for a number of reasons (e.g., testing, feasibility studies, etc.). This transfer is usually temporary and can initiate a more formal working arrangement. At this time, TDC, in conjunction with Argonne's Legal Department, provides such agreements on an as-needed basis. If you would like to acquire material produced by Argonne researchers during the course of a federally funded research project, please contact TDC or fill out a Material Transfer Agreement request form. Printed or electronically downloaded copies may become obsolete. Before using such a copy for work direction, employees must verify that it is current by comparing its revision number with that of the online version. Obsolete forms will be rejected.

447

Time-resolved energy transfer from single chloride-terminated nanocrystals to graphene  

SciTech Connect

We examine the time-resolved resonance energy transfer of excitons from single n-butyl amine-bound, chloride-terminated nanocrystals to two-dimensional graphene through time-correlated single photon counting. The radiative biexponential lifetime kinetics and blinking statistics of the individual surface-modified nanocrystal elucidate the non-radiative decay channels. Blinking modification as well as a 4 reduction in spontaneous emission were observed with the short chloride and n-butylamine ligands, probing the energy transfer pathways for the development of graphene-nanocrystal nanophotonic devices.

Ajayi, O. A., E-mail: oaa2114@columbia.edu, E-mail: cww2104@columbia.edu; Wong, C. W., E-mail: oaa2114@columbia.edu, E-mail: cww2104@columbia.edu [Optical Nanostructures Laboratory, Center for Integrated Science and Engineering, Solid-State Science and Engineering, Columbia University, New York, New York 10027 (United States); Department of Mechanical Engineering, Columbia University, New York, New York 10027 (United States); Anderson, N. C.; Wolcott, A.; Owen, J. S. [Department of Chemistry, Columbia University, New York, New York 10027 (United States); Cotlet, M. [Brookhaven National Laboratory, Upton, New York, New York 11973 (United States); Petrone, N.; Hone, J. [Department of Mechanical Engineering, Columbia University, New York, New York 10027 (United States); Gu, T.; Gesuele, F. [Optical Nanostructures Laboratory, Center for Integrated Science and Engineering, Solid-State Science and Engineering, Columbia University, New York, New York 10027 (United States)

2014-04-28T23:59:59.000Z

448

University of Iowa Carver College of Medicine Baccalaureate Degree, Radiation Sciences  

E-Print Network (OSTI)

, Radiation Sciences Interest · Follow applicable instructions for First-Year , Transfer, or International applicable instructions for Transfer or International Students · Apply to and rank order the following.medicine.uiowa.edu/radsci PH: 319-353-8388 Radiologic Technology Tracks Admission and Degree Requirements Admission

449

Charge transfer effects in surface?enhanced Raman scatteringa)  

Science Journals Connector (OSTI)

Surface?enhanced Raman scattering(SERS) due to charge?transferinteractions between the adsorbed molecule and the metal surface is analyzed using the semiempirical WolfsbergHelmholz method to relate the moleculesurface interactions and the resulting charge?transfer states to the overlap integrals between the metal conduction?band orbitals and an acceptor or donor molecular orbital of the molecule. Calculations for the model system of ethylene adsorbed on silver with charge?transfer excitation of an electron from the metal to the antibonding etylene ? orbital show that charge?transfer Raman enhancements of the order of 10 to 1000 are possible if the charge?transfer band is partially resonant with the exciting radiation. Symmetric vibrations usually will be enhanced substantially more than nonsymmetric ones by this mechanism because the vibrational coupling is primarily FranckCondon rather than HerzbergTeller. The presence of overtone and combination bands in charge?transfer?enhanced Raman spectra is also possible.

Frank J. Adrian

1982-01-01T23:59:59.000Z

450

Low-Dose/Dose-Rate Low-LET Radiation Protects Us from Cancer  

NLE Websites -- All DOE Office Websites (Extended Search)

Dose/Dose-Rate Low-LET Radiation Protects Us from Cancer Dose/Dose-Rate Low-LET Radiation Protects Us from Cancer Bobby R. Scott, Ph.D. and Jennifer D. Di Palma Lovelace Respiratory Research Institute, 2425 Ridgecrest Drive SE Albuquerque, NM 87108 USA Life on earth evolved in a low-level ionizing radiation environment comprised of terrestrial radiation and cosmic rays. Today we all reside in an ionizing radiation environment comprised of both natural background radiation and radiation from human activities (e.g., Chernobyl accident). An evolutionary benefit of the interaction of low-level, low linear-energy-transfer (LET) ionizing radiation with mammalian life forms on earth is adapted protection. Adapted protection involves low-dose/dose-rate, low-LET radiation induced high-fidelity DNA repair in cooperation with normal apoptosis (presumed p53

451

Proton-Coupled Electron Transfer  

SciTech Connect

Proton-Coupled Electron Transfer (PCET) describes reactions in which there is a change in both electron and proton content between reactants and products. It originates from the influence of changes in electron content on acid?base properties and provides a molecular-level basis for energy transduction between proton transfer and electron transfer. Coupled electron?proton transfer or EPT is defined as an elementary step in which electrons and protons transfer from different orbitals on the donor to different orbitals on the acceptor. There is (usually) a clear distinction between EPT and H-atom transfer (HAT) or hydride transfer, in which the transferring electrons and proton come from the same bond. Hybrid mechanisms exist in which the elementary steps are different for the reaction partners. EPT pathways such as PhO/PhOH exchange have much in common with HAT pathways in that electronic coupling is significant, comparable to the reorganization energy with H{sub DA} ~ ?. Multiple-Site Electron?Proton Transfer (MS-EPT) is an elementary step in which an electron?proton donor transfers electrons and protons to different acceptors, or an electron?proton acceptor accepts electrons and protons from different donors. It exploits the long-range nature of electron transfer while providing for the short-range nature of proton transfer. A variety of EPT pathways exist, creating a taxonomy based on what is transferred, e.g., 1e{sup -}/2H{sup +} MS-EPT. PCET achieves redox potential leveling between sequential couples and the buildup of multiple redox equivalents, which is of importance in multielectron catalysis. There are many examples of PCET and pH-dependent redox behavior in metal complexes, in organic and biological molecules, in excited states, and on surfaces. Changes in pH can be used to induce electron transfer through films and over long distances in molecules. Changes in pH, induced by local electron transfer, create pH gradients and a driving force for long-range proton transfer in Photosysem II and through other biological membranes. In EPT, simultaneous transfer of electrons and protons occurs on time scales short compared to the periods of coupled vibrations and solvent modes. A theory for EPT has been developed which rationalizes rate constants and activation barriers, includes temperature- and driving force (?G)-dependences implicitly, and explains kinetic isotope effects. The distance-dependence of EPT is dominated by the short-range nature of proton transfer, with electron transfer being far less demanding.Changes in external pH do not affect an EPT elementary step. Solvent molecules or buffer components can act as proton donor acceptors, but individual H2O molecules are neither good bases (pK{sub a}(H{sub 3}O{sup +}) = ?1.74) nor good acids (pK{sub a}(H{sub 2}O) = 15.7). There are many examples of mechanisms in chemistry, in biology, on surfaces, and in the gas phase which utilize EPT. PCET and EPT play critical roles in the oxygen evolving complex (OEC) of Photosystem II and other biological reactions by decreasing driving force and avoiding high-energy intermediates.

Weinberg, Dave; Gagliardi, Christopher J.; Hull, Jonathan F; Murphy, Christine Fecenko; Kent, Caleb A.; Westlake, Brittany C.; Paul, Amit; Ess, Daniel H; McCafferty, Dewey Granville; Meyer, Thomas J

2012-01-01T23:59:59.000Z

452

THE UNLV FOUNDATION MONETARY TRANSFER FORM  

E-Print Network (OSTI)

THE UNLV FOUNDATION MONETARY TRANSFER FORM (Use one form for each account) Date Department Amount Transfer from Foundation Account Name UNLV Foundation Foundation Account Number Transfer to University contributions to this fund were accepted. Multiple Transfer A monetary transfer from the UNLV Foundation

Hemmers, Oliver

453

Radiation Protection and Safety Training | Environmental Radiation...  

NLE Websites -- All DOE Office Websites (Extended Search)

The objective of this course is to provide students with an introduction to the fundamentals of ionizing radiation protection and safety. The course curriculum combines...

454

Atmospheric Radiation Measurement Radiative Atmospheric Divergence...  

NLE Websites -- All DOE Office Websites (Extended Search)

radiation emitted by the earth. This instrument is onboard a European Union geostationary weather satellite launched in December 2005; it is collecting data over Niamey and the...

455

Development of a radiative transport based, fluorescence-enhanced, frequency-domain small animal imaging system  

E-Print Network (OSTI)

% intralipid solutions. Through collaboration with Transpire, Inc., a fluorescence-enhanced, frequency-domain, radiative transport equation (RTE) solver was developed. This solver incorporates the discrete ordinates, source iteration with diffusion synthetic...

Rasmussen, John C.

2009-05-15T23:59:59.000Z

456

radiation.cdr  

Office of Legacy Management (LM)

Radiation-It's a Fact of Life Radiation-It's a Fact of Life It has been with us since the beginning of time. Everyone who has ever walked on this planet has been exposed to radiation. For the most part, nature is the largest source of exposure. It's in the air we breathe, the ground we walk on, and even the food we eat. The radiation we receive from all natural and some man-made sources is called "background radiation." The millirem (mrem) is a unit used for measuring radiation received by a person. The total average background for radiation received by people living in the United States is 360 millirem per year (mrem/yr), of which 300 mrem/yr is from natural sources, and 60 mrem/yr is man-made. Cosmic Radiation from the sun and stars Internal Radiation from naturally radioactive

457

Radiative Hydrodynamic Models of the Optical and Ultraviolet Emission from Solar Flares  

E-Print Network (OSTI)

We report on radiative hydrodynamic simulations of moderate and strong solar flares. The flares were simulated by calculating the atmospheric response to a beam of non-thermal electrons injected at the apex of a one-dimensional closed coronal loop, and include heating from thermal soft X-ray, extreme ultraviolet and ultraviolet (XEUV) emission. The equations of radiative transfer and statistical equilibrium were treated in non-LTE and solved for numerous transitions of hydrogen, helium, and Ca II allowing the calculation of detailed line profiles and continuum emission. This work improves upon previous simulations by incorporating more realistic non-thermal electron beam models and includes a more rigorous model of thermal XEUV heating. We find XEUV backwarming contributes less than 10% of the heating, even in strong flares. The simulations show elevated coronal and transition region densities resulting in dramatic increases in line and continuum emission in both the UV and optical regions. The optical continuum reaches a peak increase of several percent which is consistent with enhancements observed in solar white light flares. For a moderate flare (~M-class), the dynamics are characterized by a long gentle phase of near balance between flare heating and radiative cooling, followed by an explosive phase with beam heating dominating over cooling and characterized by strong hydrodynamic waves. For a strong flare (~X-class), the gentle phase is much shorter, and we speculate that for even stronger flares the gentle phase may be essentially non-existent. During the explosive phase, synthetic profiles for lines formed in the upper chromosphere and transition region show blue shifts corresponding to a plasma velocity of ~120 km/s, and lines formed in the lower chromosphere show red shifts of ~40 km/s.

J. C. Allred; S. L. Hawley; W. P. Abbett; M. Carlsson

2005-07-13T23:59:59.000Z

458

TECH TRANSFER TECHNOLOGY TRANSFER PROGRAM INSTITUTE OF TRANSPORTATION STUDIES UNIVERSITY OF CALIFORNIA, BERKELEY  

E-Print Network (OSTI)

TECH TRANSFER TECHNOLOGY TRANSFER PROGRAM · INSTITUTE OF TRANSPORTATION STUDIES · UNIVERSITY THURSDAY SATURDAYFRIDAYWEDNESDAYTUESDAY TECHNOLOGY TRANSFER PROGRAM · INSTITUTE OF TRANSPORTATION STUDIES's to another year of working safer and smarter. Laura Melendy Director, Technology Transfer Program #12;AUGUST

California at Berkeley, University of

459

A Two Level Finite Difference Scheme for One Dimensional Pennes' Bioheat Equation \\Lambda  

E-Print Network (OSTI)

by exposing human body to heat in a flash fire or being in contact with hot substances are some of the most for a skin heating model are conducted. Key words: bioheat transfer, Pennes' equation, finite difference.S. Department of Energy Office of Science under grant DE­FG02­02ER45961, by the Japanese Research Organization

Zhang, Jun

460

Evaluation of GCM Column Radiation Models Under Cloudy Conditions with The Arm BBHRP Value Added Product  

SciTech Connect

The overarching goal of the project was to improve the transfer of solar and thermal radiation in the most sophisticated computer tools that are currently available for climate studies, namely Global Climate Models (GCMs). This transfer can be conceptually separated into propagation of radiation under cloudy and under cloudless conditions. For cloudless conditions, the factors that affect radiation propagation are gaseous absorption and scattering, aerosol particle absorption and scattering and surface albedo and emissivity. For cloudy atmospheres the factors are the various cloud properties such as cloud fraction, amount of cloud condensate, the size of the cloud particles, and morphological cloud features such as cloud vertical location, cloud horizontal and vertical inhomogeneity and cloud shape and size. The project addressed various aspects of the influence of the above contributors to atmospheric radiative transfer variability. In particular, it examined: (a) the quality of radiative transfer for cloudless and non-complex cloudy conditions for a substantial number of radiation algorithms used in current GCMs; (b) the errors in radiative fluxes from neglecting the horizontal variabiity of cloud extinction; (c) the statistical properties of cloud horizontal and vertical cloud inhomogeneity that can be incorporated into radiative transfer codes; (d) the potential albedo effects of changes in the particle size of liquid clouds; (e) the gaseous radiative forcing in the presence of clouds; and (f) the relative contribution of clouds of different sizes to the reflectance of a cloud field. To conduct the research in the various facets of the project, data from both the DOE ARM project and other sources were used. The outcomes of the project will have tangible effects on how the calculation of radiative energy will be approached in future editions of GCMs. With better calculations of radiative energy in GCMs more reliable predictions of future climate states will be attainable, thus affecting public policy decisions with great impact to public life.

Dr. Lazaros Oreopoulos and Dr. Peter M. Norris

2010-03-14T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

Plutonium radiation surrogate  

DOE Patents (OSTI)

A self-contained source of gamma-ray and neutron radiation suitable for use as a radiation surrogate for weapons-grade plutonium is described. The source generates a radiation spectrum similar to that of weapons-grade plutonium at 5% energy resolution between 59 and 2614 keV, but contains no special nuclear material and emits little .alpha.-particle radiation. The weapons-grade plutonium radiation surrogate also emits neutrons having fluxes commensurate with the gamma-radiation intensities employed.

Frank, Michael I. (Dublin, CA)

2010-02-02T23:59:59.000Z

462

Master Equation for Ising Model  

Science Journals Connector (OSTI)

A spin system with unperturbed Hamiltonian H0=12??Bjk?xj?xk-?H??xj relaxing via the spin-lattice coupling G=12??Cjk?xj(?yk+?zk) is studied by means of the general density-matrix theory of magnetic relaxation. By making some assumptions about the magnitude and time constants of the lattice correlation functions ?Cij(t) Ckl(0)?, a master equation is obtained. It agrees at high temperatures with a master equation previously suggested by Glauber for the one-dimensional nearest-neighbor case. At high temperatures the magnetic moment relaxes with a single relaxation time, and the spin pair-correlation functions satisfy a closed set of equations. At low temperatures, however, the equations for the magnetization and the correlation functions are coupled to higher-order moments.

S. P. Heims

1965-04-19T23:59:59.000Z

463

Symmetries of the Einstein Equations  

E-Print Network (OSTI)

Generalized symmetries of the Einstein equations are infinitesimal transformations of the spacetime metric that formally map solutions of the Einstein equations to other solutions. The infinitesimal generators of these symmetries are assumed to be local, \\ie at a given spacetime point they are functions of the metric and an arbitrary but finite number of derivatives of the metric at the point. We classify all generalized symmetries of the vacuum Einstein equations in four spacetime dimensions and find that the only generalized symmetry transformations consist of: (i) constant scalings of the metric (ii) the infinitesimal action of generalized spacetime diffeomorphisms. Our results rule out a large class of possible ``observables'' for the gravitational field, and suggest that the vacuum Einstein equations are not integrable.

C. G. Torre; I. M. Anderson

1993-02-23T23:59:59.000Z

464

On Degenerate Partial Differential Equations  

E-Print Network (OSTI)

Some of recent developments, including recent results, ideas, techniques, and approaches, in the study of degenerate partial differential equations are surveyed and analyzed. Several examples of nonlinear degenerate, even mixed, partial differential equations, are presented, which arise naturally in some longstanding, fundamental problems in fluid mechanics and differential geometry. The solution to these fundamental problems greatly requires a deep understanding of nonlinear degenerate partial differential equations. Our emphasis is on exploring and/or developing unified mathematical approaches, as well as new ideas and techniques. The potential approaches we have identified and/or developed through these examples include kinetic approaches, free boundary approaches, weak convergence approaches, and related nonlinear ideas and techniques. We remark that most of the important problems for nonlinear degenerate partial differential equations are truly challenging and still widely open, which require further new ideas, techniques, and approaches, and deserve our special attention and further efforts.

Gui-Qiang G. Chen

2010-05-15T23:59:59.000Z

465

NREL: Technology Transfer Home Page  

NLE Websites -- All DOE Office Websites (Extended Search)

Technology Transfer Technology Transfer Search More Search Options Site Map The National Renewable Energy Laboratory (NREL) works with industry and organizations to transfer renewable energy and energy efficiency technologies into the marketplace. Working with Us We offer many opportunities and ways for you to partner with us. Learn more about our technology partnership agreements and services: Agreements for Commercializing Technology Cooperative Research and Development Agreements Technologies Available for Licensing Technology Partnerships Work for Others Research Facilities NREL follows its principles for establishing mutually beneficial technology partnerships. Through our commercialization programs, we work to stimulate the market for clean energy technologies and foster the growth of clean energy start-ups.

466

Entropic corrections to Einstein equations  

SciTech Connect

Considering the general quantum corrections to the area law of black hole entropy and adopting the viewpoint that gravity interprets as an entropic force, we derive the modified forms of Modified Newtonian dynamics (MOND) theory of gravitation and Einstein field equations. As two special cases we study the logarithmic and power-law corrections to entropy and find the explicit form of the obtained modified equations.

Hendi, S. H. [Physics Department, College of Sciences, Yasouj University, Yasouj 75914 (Iran, Islamic Republic of); Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), Maragha (Iran, Islamic Republic of); Sheykhi, A. [Research Institute for Astronomy and Astrophysics of Maragha (RIAAM), Maragha (Iran, Islamic Republic of); Department of Physics, Shahid Bahonar University, P.O. Box 76175-132, Kerman (Iran, Islamic Republic of)

2011-04-15T23:59:59.000Z

467

Optical Properties and Radiation-Enhanced Evaporation of Nanofluid Fuels Containing Carbon-Based Nanostructures  

E-Print Network (OSTI)

and thermal systems as an advanced heat-transfer fluid, e.g., advanced cooling of electronics systemsOptical Properties and Radiation-Enhanced Evaporation of Nanofluid Fuels Containing Carbon characteristics of nanofluid fuels with stable suspension of carbon-based nanostructures under radiation

Qiao, Li

468

Turbulence radiation interaction in Reynolds-averaged Navier-Stokes simulations of nonpremixed piloted turbulent laboratory-scale flames  

SciTech Connect

Numerical simulation results are presented for two axisymmetric, nonluminous turbulent piloted jet diffusion flames: Sandia Flame D (SFD) and Delft Flame III (DFIII). Turbulence is represented by a Reynolds stress transport model, while chemistry is modeled by means of steady laminar flamelets. We use the preassumed PDF approach for turbulence-chemistry interaction. A weighted sum of gray gases model is used for the gas radiative properties. The radiative transfer equation is solved using the discrete ordinates method in the conservative finite-volume formulation. The radiative loss leads to a decrease in mean temperature, but does not significantly influence the flow and mixing fields, in terms either of mean values or of rms values of fluctuations. A systematic analysis of turbulence-radiation interaction (TRI) is carried out. By considering five different TRI formulations, and comparing also with a simple optically thin model, individual TRI contributions are isolated and quantified. For both flames, effects are demonstrated of (1) influence of temperature fluctuations on the mean Planck function, (2) temperature and composition fluctuations on the mean absorption coefficient, and (3) correlation between absorption coefficient and Planck function. The strength of the last effect is stronger in DFIII than in SFD, because of stronger turbulence-chemistry interaction and lower mean temperature in DFIII. The impact of the choice of TRI model on the prediction of the temperature-sensitive minor species NO is determined in a postprocessing step with fixed flow and mixing fields. Best agreement for NO is obtained using the most complete representation of TRI. (author)

Habibi, A.; Merci, B. [Department of Flow, Heat and Combustion Mechanics, Ghent University, B-9000 Ghent (Belgium); Roekaerts, D. [Delft University of Technology, Delft (Netherlands)

2007-10-15T23:59:59.000Z

469

Summary Report on Federal Laboratory Technology Transfer  

E-Print Network (OSTI)

Summary Report on Federal Laboratory Technology Transfer Agency Approaches; FY 2001 Activity Metrics and Outcomes 2002 Report to the President and the Congress under the Technology Transfer: FEDERAL LAB TECHNOLOGY TRANSFER TABLE OF CONTENTS LIST OF FIGURES AND TABLES

Perkins, Richard A.

470

Heat Transfer from a Rotating Disk  

Science Journals Connector (OSTI)

...August 1956 research-article Heat Transfer from a Rotating Disk E. C. Cobb...little has been published on the heat transfer. For laminar conditions theoretical...experimental investigation of the heat transfer for a range of conditions from...

1956-01-01T23:59:59.000Z

471

Coordination of Transmission Line Transfer Capabilities  

E-Print Network (OSTI)

Coordination of Transmission Line Transfer Capabilities Final Project Report Power Systems since 1996 PSERC #12;Power Systems Engineering Research Center Coordination of Transmission Line Summary The maximum power that can be transferred over any transmission line, called the transfer capacity

472

Heat and moisture transfer through clothing  

E-Print Network (OSTI)

Mathematical simulation of heat and moisture transfer in aand R. C. Eberhart (ed), Heat transfer in medicine andFan, J. 2008. Study of heat and moisture transfer within

Voelker, Conrad; Hoffmann, Sabine; Kornadt, Oliver; Arens, Edward; Zhang, Hui; Huizenga, Charlie

2009-01-01T23:59:59.000Z

473

Exponential Attractor for a Nonlinear Boussinesq Equation  

Science Journals Connector (OSTI)

This paper is devoted to prove the existence of an exponential attractor for the semiflow generated by a nonlinear Boussinesq equation. We formulate the Boussinesq equation as an abstract equation in the... ...

Ahmed Y. Abdallah

2006-07-01T23:59:59.000Z

474

Lattice Boltzmann equation for relativistic quantum mechanics  

Science Journals Connector (OSTI)

...V. Coveney and S. Succi Lattice Boltzmann equation for relativistic quantum...Relativistic versions of the quantum lattice Boltzmann equation are discussed. It...by a multicomponent complex lattice Boltzmann equation. Lattice Boltzmann...

2002-01-01T23:59:59.000Z

475

Radiation Safety Program Annual Review  

E-Print Network (OSTI)

........................................................................10 AREA RADIATION SURVEYS AND CONTAMINATION CONTROL...........................................11.....................................................................................................13 RADIOACTIVE WASTE MANAGEMENT meetings of the Radiation Safety Committee where new users and uses of radioactive materials, radiation

Lyubomirsky, Ilya

476

Data Transfer Nodes Yield Results!  

NLE Websites -- All DOE Office Websites (Extended Search)

DTN DTN Data Transfer Nodes Yield Results August 1, 2011 | Tags: Accelerator Science, Data Transfer, ESnet Linda Vu, +1 510 495 2402, lvu@lbl.gov The ability to reliably move and share data around the globe is essential to scientific collaboration, that's why three Department of Energy (DOE) Scientific Computing Centers-Argonne and Oak Ridge Leadership Computing Facilities, and the National Energy Research Scientific Computing Center (NERSC)-have teamed up to focus on optimizing wide area network (WAN) transfers. This ongoing effort began several years ago when each site deployed dedicated transfer nodes (DTNs), optimized for carrying data between the DOE facilities. Today, engineers from each site continue to meet regularly with DOE's Energy Sciences Network staff (ESnet) to develop strategies

477

Heat transfer in microsphere insulation  

Science Journals Connector (OSTI)

The results of an investigation of heat transfer in a new type of insulation (microsphere insulation) are presented. The effects of the ... gas pressure on the thermal conductivity of the insulation were investig...

R. Wawryk; J. Rafa?owicz

478

Preparing for Transfer Biological Engineering  

E-Print Network (OSTI)

Environmental Engineering Game Design Industrial Systems & Information Technology Information Science MaterialsPreparing for Transfer Majors: Biological Engineering Chemical Engineering Civil Engineering Computer Science Electrical & Computer Engineering Engineering Physics Environmental Engineering

Walter, M.Todd

479

Electrohydrodynamically enhanced condensation heat transfer  

E-Print Network (OSTI)

In a condenser the thickness of the liquid condensate film covering the cooled surface constitutes a resistance to the heat transfer. By establishing a non uniform electric field in the vicinity of the condensation surface the extraction of liquid...

Wawzyniak, Markus

2012-06-07T23:59:59.000Z

480

Insoluble Phase-Transfer Catalysts  

Science Journals Connector (OSTI)

An important problem facing the designer of industrial phase-transfer catalysis (PTC) processes using soluble PTC catalysts concerns the removal of the catalyst from the reaction mixture, and its economic recy...

Charles M. Starks; Charles L. Liotta; Marc E. Halpern

1994-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "radiative transfer equation" 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

Radiation Dose Estimates from  

E-Print Network (OSTI)

Summary: Radiation Dose Estimates from Hanford Radioactive Material Releases to the Air- tantly, what radiation dose people may have received. An independent Technical Steering Panel (TSP, additionalProjectworkcouldresultin revisions of these dose estimates. April 21, 1994 Companion

482

Maryland Radiation Act (Maryland)  

Energy.gov (U.S. Department of Energy (DOE))

The policy of the state is to provide for the constructive use of radiation and control radiation emissions. This legislation authorizes the Department of the Environment to develop comprehensive...

483

WI Radiation Protection  

Energy.gov (U.S. Department of Energy (DOE))

This statute seeks to regulate radioactive materials, to encourage the constructive uses of radiation, and to prohibit and prevent exposure to radiation in amounts which are or may be detrimental...

484

Technology_Transfer_Memo.pdf | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

TechnologyTransferMemo.pdf TechnologyTransferMemo.pdf TechnologyTransferMemo.pdf More Documents & Publications PolicyStatementonTechnologyTransfer.pdf...

485

Method Of Transferring Strained Semiconductor Structures  

NLE Websites -- All DOE Office Websites (Extended Search)

Of Transferring Strained Semiconductor Structures Of Transferring Strained Semiconductor Structures Method Of Transferring Strained Semiconductor Structures The transfer of strained semiconductor layers from one substrate to another substrate involves depositing a multilayer structure on a substrate having surface contaminants. June 25, 2013 Method Of Transferring Strained Semiconductor Structures The transfer of strained semiconductor layers from one substrate to another substrate involves depositing a multilayer structure on a substrate having surface contaminants. Available for thumbnail of Feynman Center (505) 665-9090 Email Method Of Transferring Strained Semiconductor Structures The transfer of strained semiconductor layers from one substrate to another substrate involves depositing a multilayer structure on a substrate having

486

Transferring Data from Batch Jobs at NERSC  

NLE Websites -- All DOE Office Websites (Extended Search)

Transferring Data from Batch Jobs Transferring Data from Batch Jobs Examples Once you are set up for automatic authentication (see HPSS Passwords) you can access HPSS within batch...

487

Sandia National Laboratories: Small Business Technology Transfer...  

NLE Websites -- All DOE Office Websites (Extended Search)

Business Technology Transfer Research program JBEI Research Receives Strong Industry Interest in DOE Technology Transfer Call On September 18, 2013, in Biofuels, Biomass, Energy,...

488

Secretary Bodman Announces DOE Technology Transfer Coordinator...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

DOE Technology Transfer Coordinator Secretary Bodman Announces DOE Technology Transfer Coordinator June 29, 2007 - 2:36pm Addthis Establishes Policy Board; Strengthens DOE Efforts...

489

PAVEMENT TECHNOLOGY UPDATE This Technology Transfer Program  

E-Print Network (OSTI)

PAVEMENT TECHNOLOGY UPDATE This Technology Transfer Program publication is funded by the Division to them in California. TECHNOLOGY TRANSFER PROGRAM MAY 2011, VOL. 3, NO. 1 California's Transition

California at Berkeley, University of

490

Heat Transfer Enhancement in Thermoelectric Power Generation.  

E-Print Network (OSTI)

??Heat transfer plays an important role in thermoelectric (TE) power generation because the higher the heat-transfer rate from the hot to the cold side of (more)

Hu, Shih-yung

2009-01-01T23:59:59.000Z

491

Heat Transfer Fluids Containing Nanoparticles | Argonne National...  

NLE Websites -- All DOE Office Websites (Extended Search)

Heat Transfer Fluids Containing Nanoparticles Technology available for licensing: A stable, nonreactive nanofluid that exhibits enhanced heat transfer properties with only a...

492

17. Helmholtz Equation The Helmholtz equation, or reduced wave equation, has the form  

E-Print Network (OSTI)

-frequency or time-harmonic solutions to the wave equation (! ref ). If u(x;t) = v(x)e i!t satis es utt = c2 u

Trefethen, Nick

493

Nonlinear State Space Model of a Hydraulic Wind Power Transfer Masoud Vaezi1  

E-Print Network (OSTI)

Nonlinear State Space Model of a Hydraulic Wind Power Transfer Masoud Vaezi1 , Majid Deldar1 1, IUPUI. Gearless hydraulic wind power systems are considered as nonlinear models because of some discrete nonlinear governing equations for the elements in the proposed hydraulic wind power configuration. Nonlinear

Zhou, Yaoqi

494

A numerical study of heat and momentum transfer over a bank of flat tubes  

E-Print Network (OSTI)

), Prandtl number (Pr), length ratio (L/Da), and height ratio (H/Da), on the pressure drop and heat transfer were studied. A finite volume based FORTRAN code was developed to solve the governing equations. The scalar and velocity variables were stored...

Bahaidarah, Haitham M. S.

2005-11-01T23:59:59.000Z

495

Contact NETL Technology Transfer Group  

NLE Websites -- All DOE Office Websites (Extended Search)

NETL Technology Transfer Group techtransfer@netl.doe.gov May 2012 Significance * Applicable to subcritical and supercritical air-fired boiler designs * Eliminates the need to mimic air-fired heat transfer characteristics in order to meet existing dry steam load demands * Reduces retrofit complexity, time, and cost Applications * Retrofitting of conventional air-fired boilers Opportunity Research is active on the patent-pending technology, titled "Temperature

496

Spring 2014 Heat Transfer -2  

E-Print Network (OSTI)

Spring 2014 Heat Transfer - 2 A thin electronic chip is in the shape of a square wafer, b = 1 cm surface of the chip with a heat transfer coefficient of h = 100 W/m2 -K. Assume the chip has a uniform per side with a mass of m = 0.3 grams and specific heat of C = 103 J/kg-K. The chip is mounted

Virginia Tech

497

Energy Cost of Information Transfer  

Science Journals Connector (OSTI)

From thermodynamic and causality considerations a general upper bound on the rate at which information can be transferred in terms of the message energy is inferred. This bound is consistent with Shannon's bounds for a band-limited channel. It prescribes the minimum energy cost for information transferred over a given time interval. As an application, a fundamental upper bound of 1015 operations/sec on the speed of an ideal digital computer is established.

Jacob D. Bekenstein

1981-03-09T23:59:59.000Z

498

ARM - Field Campaign - Routine AAF CLOWD Optical Radiative Observations  

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govCampaignsRoutine AAF CLOWD Optical Radiative Observations (RACORO) govCampaignsRoutine AAF CLOWD Optical Radiative Observations (RACORO) Campaign Links RACORO Website Related Campaigns Surface Radiation Comparison Transfer Measurements for RACORO 2009.01.20, Long, SGP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Routine AAF CLOWD Optical Radiative Observations (RACORO) 2009.01.22 - 2009.06.30 Website : http://acrf-campaign.arm.gov/racoro/ Lead Scientist : Andrew Vogelmann For data sets, see below. Description The ARM Aerial Facility (AAF) supported the Routine AAF Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations (RACORO) field campaign, led by principal investigator Andrew Vogelmann. During this long-term campaign, the AAF conducted routine flights at the ACRF Southern

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304 MATLAB.7 Partial Differential Equations  

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304. MATLAB.7. Partial Differential Equations. Solving the Heat Equation . Consider the problem. The Fourier sine coefficients for f are b (m) = (cos (m*pi/ 2) -cos...

500

IOP PUBLISHING JOURNAL OF PHYSICS A: MATHEMATICAL AND THEORETICAL J. Phys. A: Math. Theor. 40 (2007) 50255044 doi:10.1088/1751-8113/40/19/007  

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of paraxial waves in the radiative transfer limits. The scaling limits give rises to deterministic transport 5025 #12;5026 A C Fannjiang equation. In other words, in radiative transfer, the whole hierarchy of two-frequency moment equations is reduced to a single radiative-transfer-like equation. Let Lz and Lx be, respectively

Fannjiang, Albert