A fourth-order nonlinear PDE as gradient flow of the Fisher information in Wasserstein spaces
Savaré, Giuseppe
A fourth-order nonlinear PDE as gradient flow of the Fisher information in Wasserstein spaces://www.imati.cnr.it/savare A-HYKE2, april 2004 p.1 #12;Plan 1. The fourth order equation and its structure 2. Gradient flows. The fourth order equation and its structure 2. Gradient flows and Wasserstein distance 3. Main results
Model Order Reduction in Porous Media Flow Simulation and Optimization
Ghasemi, Mohammadreza
2015-05-06T23:59:59.000Z
Subsurface flow modeling and simulation is ubiquitous in many energy related processes, including oil and gas production. These models are usually large scale and simulating them can be very computationally demanding, particularly in work-flows...
Improving work flow management in an order fulfillment organization
Sandhu, Kuldip (Kuldip Kaur)
2011-01-01T23:59:59.000Z
Amazon.com is experiencing dramatic growth in customer demand through increasingly diversified product offerings and from introduction of Amazon Prime Shipping. As the volume of customer orders increases and a higher number ...
Impact of higher-order flows in the moment equations on Pfirsch-Schlüter friction coefficients
Honda, M., E-mail: honda.mitsuru@jaea.go.jp [Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 (Japan)
2014-09-15T23:59:59.000Z
The impact of the higher-order flows in the moment approach on an estimate of the friction coefficients is numerically examined. The higher-order flows are described by the lower-order hydrodynamic flows using the collisional plasma assumption. Their effects have not been consistently taken into account thus far in the widely used neoclassical transport codes based on the moment equations in terms of the Pfirsch-Schlüter flux. Due to numerically solving the friction-flow matrix without using the small-mass ratio expansion, it is clearly revealed that incorporating the higher-order flow effects is of importance especially for plasmas including multiple hydrogenic ions and other lighter species with similar masses.
A FIRST ORDER PROJECTIONBASED TIMESPLITTING SCHEME FOR COMPUTING CHEMICALLY REACTING FLOWS
A FIRST ORDER PROJECTIONBASED TIMESPLITTING SCHEME FOR COMPUTING CHEMICALLY REACTING FLOWS catalytic reactors for methane to methanol conversion and chemical vapor deposition (CVD) process modeling ANDREAS PROHL 1 Abstract. The simulation of chemically reacting flows in specific situations is a basic
Multigrid for Higher Order Discontinuous Galerkin Finite Elements Applied to Groundwater Flow
Bastian, Peter
Multigrid for Higher Order Discontinuous Galerkin Finite Elements Applied to Groundwater Flow Peter elements applied to the groundwater flow equation. It uses an incomplete LU decomposition on an element for diffusion problems has been formu- lated in [6]. 1.1 Notation In this paper we wish to solve the groundwater
Ligare, Martin
simply propagates at its reaction-diffusion (no flow) velocity minus the wind speed. If the same wind-dependent flows as well. In the absence of fluid flows, a front propagates with a reaction-diffusion (RD) velocityChemical Reaction Fronts in Ordered and Disordered Cellular Flows with Opposing Winds M. E
A FIRST ORDER PROJECTION-BASED TIME-SPLITTING SCHEME FOR COMPUTING CHEMICALLY REACTING FLOWS
A FIRST ORDER PROJECTION-BASED TIME-SPLITTING SCHEME FOR COMPUTING CHEMICALLY REACTING FLOWS, surface catalytic reactors for methane to methanol conversion and chemical vapor deposition (CVD) process ANDREAS PROHL1 Abstract. The simulation of chemically reacting ows in speci#12;c situations is a basic
Optimal investment on finite horizon with random discrete order flow in illiquid markets
Paris-Sud XI, Université de
both on trading and observation of the assets. For example, in power markets, trading occurs through at any time but trading occurs more frequently near a terminal horizon. The investor can observe and trade the risky asset only at exogenous random times corresponding to the order flow given
The Long Memory of Order Flow in the Foreign Exchange Spot Market
Gould, Martin D; Howison, Sam D
2015-01-01T23:59:59.000Z
We study the long memory of order flow for each of three liquid currency pairs on a large electronic trading platform in the foreign exchange (FX) spot market. Due to the extremely high levels of market activity on the platform, and in contrast to existing empirical studies of other markets, our data enables us to perform statistically stable estimation without needing to aggregate data from different trading days. We find strong evidence of long memory, with a Hurst exponent of approximately 0.7, for each of the three currency pairs and on each trading day in our sample. We repeat our calculations using data that spans different trading days, and we find no significant differences in our results. We test and reject the hypothesis that the apparent long memory of order flow is an artefact caused by structural breaks, in favour of the alternative hypothesis of true long memory. We therefore conclude that the long memory of order flow in the FX spot market is a robust empirical property that persists across dai...
Reduced Order Model and Uncertainty Quantification for Stochastic Porous Media Flows
Wei, Jia
2012-10-19T23:59:59.000Z
Subject: Mathematics iii ABSTRACT Reduced Order Model and Uncertainty Quanti cation for Stochastic Porous Media Flows. (August 2012) Jia Wei, B.S., Yunnan University, China; M.S., Nankai University, China Co-Chairs of Advisory Committee: Dr. Yalchin... w and o, respectively. We write Darcy’s law for each phase as vj = krj(S) j k(x; !)rp; (2.1) where vj is the phase velocity, k(x; !) is the permeability tensor, krj is the relative permeability to phase j (j = o; w), S is the water...
A reduced-order model based on proper orthogonal decomposition for non-isothermal two-phase flows
Richardson, Brian Ross
2009-05-15T23:59:59.000Z
This thesis presents a study of reduced-order models based on proper orthogonal decomposition applied to non-isothermal transport phenomena in °uidized beds. A numerical °ow solver called Multiphase Flow with Interphase eXchanges (MFIX) was used...
Chen, LW; Ko, Che Ming; Lin, ZW.
2004-01-01T23:59:59.000Z
Higher-order anisotropic flows v(4) and v(6) of charged hadrons in heavy-ion collisions at the Relativistic Heavy Ion Collider are studied in a multiphase transport model that has previously been used successfully for describing the elliptic flow v...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (Million Cubic Feet) Natural Gas DeliveredStents -(NEI)I REEECNO OF DOCUMENT BEINGthe YearORDER
Kallinderis, Yannis, E-mail: kallind@otenet.gr [Dept. of Mechanical and Aeronautical Engineering, University of Patras, Rio Patras 26504 (Greece)] [Dept. of Mechanical and Aeronautical Engineering, University of Patras, Rio Patras 26504 (Greece); Vitsas, Panagiotis A.; Menounou, Penelope [Dept. of Mechanical and Aeronautical Engineering, University of Patras, Rio Patras 26504 (Greece)] [Dept. of Mechanical and Aeronautical Engineering, University of Patras, Rio Patras 26504 (Greece)
2012-07-15T23:59:59.000Z
A low-order flow/acoustics interaction method for the prediction of sound propagation and diffraction in unsteady subsonic compressible flow using adaptive 3-D hybrid grids is investigated. The total field is decomposed into the flow field described by the Euler equations, and the acoustics part described by the Nonlinear Perturbation Equations. The method is shown capable of predicting monopole sound propagation, while employment of acoustics-guided adapted grid refinement improves the accuracy of capturing the acoustic field. Interaction of sound with solid boundaries is also examined in terms of reflection, and diffraction. Sound propagation through an unsteady flow field is examined using static and dynamic flow/acoustics coupling demonstrating the importance of the latter.
Moortgat, Joachim
2013-01-01T23:59:59.000Z
Numerical simulation of multiphase compositional flow in fractured porous media, when all the species can transfer between the phases, is a real challenge. Despite the broad applications in hydrocarbon reservoir engineering and hydrology, a compositional numerical simulator for three-phase flow in fractured media has not appeared in the literature, to the best of our knowledge. In this work, we present a three-phase fully compositional simulator for fractured media, based on higher-order finite element methods. To achieve computational efficiency, we invoke the cross-flow equilibrium (CFE) concept between discrete fractures and a small neighborhood in the matrix blocks. We adopt the mixed hybrid finite element (MHFE) method to approximate convective Darcy fluxes and the pressure equation. This approach is the most natural choice for flow in fractured media. The mass balance equations are discretized by the discontinuous Galerkin (DG) method, which is perhaps the most efficient approach to capture physical dis...
Reduced-Order Models of Zero-Net Mass-Flux Jets for Large-Scale Flow Control Simulations
Mittal, Rajat
Reduced-Order Models of Zero-Net Mass-Flux Jets for Large-Scale Flow Control Simulations Reni Raju computational tools are well suited for modeling the dynamics of zero-net mass-flux actuators, the computational vorticity, (s-1 ) I. Introduction ERO-net mass-flux (ZNMF) actuators or "synthetic jets" have potential
A high-order vertex-based central ENO finite-volume scheme for three-dimensional compressible flows
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Charest, Marc R.J.; Canfield, Thomas R.; Morgan, Nathaniel R.; Waltz, Jacob; Wohlbier, John G.
2015-07-01T23:59:59.000Z
High-order discretization methods offer the potential to reduce the computational cost associated with modeling compressible flows. However, it is difficult to obtain accurate high-order discretizations of conservation laws that do not produce spurious oscillations near discontinuities, especially on multi-dimensional unstructured meshes. A novel, high-order, central essentially non-oscillatory (CENO) finite-volume method that does not have these difficulties is proposed for tetrahedral meshes. The proposed unstructured method is vertex-based, which differs from existing cell-based CENO formulations, and uses a hybrid reconstruction procedure that switches between two different solution representations. It applies a high-order k-exact reconstruction in smooth regions and a limited linearmore »reconstruction when discontinuities are encountered. Both reconstructions use a single, central stencil for all variables, making the application of CENO to arbitrary unstructured meshes relatively straightforward. The new approach was applied to the conservation equations governing compressible flows and assessed in terms of accuracy and computational cost. For all problems considered, which included various function reconstructions and idealized flows, CENO demonstrated excellent reliability and robustness. Up to fifth-order accuracy was achieved in smooth regions and essentially non-oscillatory solutions were obtained near discontinuities. The high-order schemes were also more computationally efficient for high-accuracy solutions, i.e., they took less wall time than the lower-order schemes to achieve a desired level of error. In one particular case, it took a factor of 24 less wall-time to obtain a given level of error with the fourth-order CENO scheme than to obtain the same error with the second-order scheme.« less
Significant development pressure currently affects the flows of the Verde River. In order to protect
Fay, Noah
- informed water management. To understand conse- quences to the ecosystem of various water use scenari- os surface water flows required to support the Verde River ecosystem. The Ecosystem Flows ap- proach used the information needed to define rela- tionships between water supply conditions and the biological system
Jameson, Antony
High-order accurate simulation of low-Mach laminar flow past two side-by-side cylinders using applications on simulating laminar flow past two side-by-side cylinders at various spacings. The high-by-side cylinders Investigations of the fluid flow and vortex dynamics about sim- ple configurations of two
Physics-Based Low Order Galerkin Models in Fluid Dynamics & Flow Control
Gorban, Alexander N.
(Berlin Institute of Technology MB1, Germany) Marek Morzynski (Poznan University of Technology, Poland models of energy supply and consumption. Yet a third principle is the realization that governing flow to time-averaged energy dynamics of Galerkin modes, and gives rise to physically based, nonlinear sub
Completeness of first and second order ODE flows and of Euler-Lagrange equations
E. Minguzzi
2015-07-03T23:59:59.000Z
Two results on the completeness of maximal solutions to first and second order ordinary differential equations (or inclusions) over complete Riemannian manifolds, with possibly time-dependent metrics, are obtained. Applications to Lagrangian mechanics and gravitational waves are given.
Shang, Yu; Yu, Guoqiang, E-mail: guoqiang.yu@uky.edu [Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky 40506 (United States)
2014-09-29T23:59:59.000Z
Conventional semi-infinite analytical solutions of correlation diffusion equation may lead to errors when calculating blood flow index (BFI) from diffuse correlation spectroscopy (DCS) measurements in tissues with irregular geometries. Very recently, we created an algorithm integrating a Nth-order linear model of autocorrelation function with the Monte Carlo simulation of photon migrations in homogenous tissues with arbitrary geometries for extraction of BFI (i.e., ?D{sub B}). The purpose of this study is to extend the capability of the Nth-order linear algorithm for extracting BFI in heterogeneous tissues with arbitrary geometries. The previous linear algorithm was modified to extract BFIs in different types of tissues simultaneously through utilizing DCS data at multiple source-detector separations. We compared the proposed linear algorithm with the semi-infinite homogenous solution in a computer model of adult head with heterogeneous tissue layers of scalp, skull, cerebrospinal fluid, and brain. To test the capability of the linear algorithm for extracting relative changes of cerebral blood flow (rCBF) in deep brain, we assigned ten levels of ?D{sub B} in the brain layer with a step decrement of 10% while maintaining ?D{sub B} values constant in other layers. Simulation results demonstrate the accuracy (errors?order (N???5) linear algorithm in extracting BFIs in different tissue layers and rCBF in deep brain. By contrast, the semi-infinite homogenous solution resulted in substantial errors in rCBF (34.5%???errors???60.2%) and BFIs in different layers. The Nth-order linear model simplifies data analysis, thus allowing for online data processing and displaying. Future study will test this linear algorithm in heterogeneous tissues with different levels of blood flow variations and noises.
Measurements of Higher Order Flow Harmonics in Au + Au Collisions at s_NN = 200 GeV
Adare, A. [University of Colorado, Boulder; Awes, Terry C [ORNL; Cianciolo, Vince [ORNL; Efremenko, Yuri V [ORNL; Enokizono, Akitomo [Oak Ridge National Laboratory (ORNL); Read Jr, Kenneth F [ORNL; Silvermyr, David O [ORNL; Sorensen, Soren P [University of Tennessee, Knoxville (UTK); Stankus, Paul W [ORNL
2011-01-01T23:59:59.000Z
Flow coefficients v{sub n} for n = 2, 3, 4, characterizing the anisotropic collective flow in Au+Au collisions at {radical}s{sub NN} = 200 GeV, are measured relative to event planes {Psi}{sub n}, determined at large rapidity. We report v{sub n} as a function of transverse momentum and collision centrality, and study the correlations among the event planes of different order n. The v{sub n} are well described by hydrodynamic models which employ a Glauber Monte Carlo initial state geometry with fluctuations, providing additional constraining power on the interplay between initial conditions and the effects of viscosity as the system evolves. This new constraint can serve to improve the precision of the extracted shear viscosity to entropy density ratio {eta}/s.
Firoozabadi, Abbas
to approximate convective Darcy fluxes and the pressure equa- tion. This approach is the most natural choice for flow in fractured media. The mass balance equations are discretized by the discontinuous Galerkin (DG injection in oil reservoirs that have previously been water flooded. Another example is when gas is injected
Kohley, Zachary Wayne
2011-10-21T23:59:59.000Z
. . . . . . . . . . . . . . . . . . . . . . . . . . 1 A. Nuclear Equation of State . . . . . . . . . . . . . . . . . . 1 B. Transverse Collective Flow . . . . . . . . . . . . . . . . . . 7 C. Mid-Rapidity/Neck Emission . . . . . . . . . . . . . . . . . 15 D. Outline... . . . . . . . . . 21 2. TAMU Neutron Ball . . . . . . . . . . . . . . . . . . . 26 3. Electronics . . . . . . . . . . . . . . . . . . . . . . . . 29 C. Particle Identification . . . . . . . . . . . . . . . . . . . . . 42 1. CsI Fast Versus Slow (Fast...
A reduced-order model based on proper orthogonal decomposition for non-isothermal two-phase flows
Richardson, Brian Ross
2009-05-15T23:59:59.000Z
of computational costs. v NOMENCLATURE Cp ? Constant pressure speciflc heat dps ? Solid particle diameter Fgs ? Coe?cient for the interphase force between gas and solid phases g ? Gravity acceleration K ? Difiusivity coe?cient m ? Number of POD modes M ? Number... for the POD-based reduced-order mod- els. The conclusions and future work are presented in Chapter VIII. Appendix A describes the constitutive models used to close the transport equations. Appendix B presents the algorithm for calculating the convection...
Mittal, Rajat
Hopkins University, Baltimore, MD 21218, United States a r t i c l e i n f o Article history: Received 24 examples of this is the cabin noise in automobiles associated with external air-flow and another
Jun Xu; Che Ming Ko
2011-09-27T23:59:59.000Z
Using a multiphase transport model that includes both initial partonic and final hadronic scatterings, we have studied higher-order anisotropic flows as well as dihadron correlations as functions of pseudorapidity and azimuthal angular differences between trigger and associated particles in Pb-Pb collisions at $\\sqrt{s_{NN}}=2.76$ TeV. With parameters in the model determined previously from fitting the measured multiplicity density of mid-pseudorapidity charged particles in central collisions and their elliptic flow in mid-central collisions, the calculated higher-order anisotropic flows from the two-particle cumulant method reproduce approximately those measured by the ALICE Collaboration, except at small centralities where they are slightly overestimated. Similar to experimental results, the two-dimensional dihadron correlations at most central collisions show a ridge structure at the near side and a broad structure at the away side. The short- and long-range dihadron azimuthal correlations, corresponding to small and large pseudorapidity differences, respectively, are studied for triggering particles with different transverse momenta and are found to be qualitatively consistent with experimental results from the CMS Collaboration. The relation between the short-range and long-range dihadron correlations with that induced by back-to-back jet pairs produced from initial hard collisions is also discussed.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Aad, G.
2015-09-14T23:59:59.000Z
Correlations between the elliptic or triangular flow coefficients vm (m=2 or 3) and other flow harmonics vn (n=2 to 5) are measured using ?sNN=2.76 TeV Pb+Pb collision data collected in 2010 by the ATLAS experiment at the LHC, corresponding to an integrated luminosity of 7 ?b-1. The vm-vn correlations are measured in midrapidity as a function of centrality, and, for events within the same centrality interval, as a function of event ellipticity or triangularity defined in a forward rapidity region. For events within the same centrality interval, v3 is found to be anticorrelated with v2 and this anticorrelation is consistentmore »with similar anticorrelations between the corresponding eccentricities, ?2 and ?3. However, it is observed that v4 increases strongly with v2, and v5 increases strongly with both v2 and v3. The trend and strength of the vm-vn correlations for n=4 and 5 are found to disagree with ?m-?n correlations predicted by initial-geometry models. Instead, these correlations are found to be consistent with the combined effects of a linear contribution to vn and a nonlinear term that is a function of v22 or of v2v3, as predicted by hydrodynamic models. A simple two-component fit is used to separate these two contributions. The extracted linear and nonlinear contributions to v4 and v5 are found to be consistent with previously measured event-plane correlations.« less
Presidential Orders Executive Order 31
Yetisgen-Yildiz, Meliha
1 Presidential Orders Executive Order 31 Non-discrimination and Affirmative Action 1. Non. As permitted by applicable law, the University will take affirmative action to ensure equality of opportunity
S. A. Voloshin
2002-11-20T23:59:59.000Z
Recent experimental results on directed and elliptic flow, theoretical developments, and new techniques for anisotropic flow analysis are reviewed.
Higher order anisotropies in hydrodynamics
Csanad, M; Lokos, S; Bagoly, A
2015-01-01T23:59:59.000Z
In the last years it has been revealed that if measuring relative to higher order event planes $\\Psi_n$, higher order flow coefficients $v_n$ for $n>2$ can be measured. It also turned out that Bose-Einstein (HBT) correlation radii also show 3rd order oscillations if measured versus the third order event plane $\\Psi_3$. In this paper we investigate how these observables can be described via analytic hydro solutions and hydro parameterizations. We also investigate the time evolution of asymmetry coefficients and the mixing of velocity field asymmetries and density asymmetries.
Higher order anisotropies in hydrodynamics
M. Csanad; A. Szabo; S. Lokos; A. Bagoly
2015-04-29T23:59:59.000Z
In the last years it has been revealed that if measuring relative to higher order event planes $\\Psi_n$, higher order flow coefficients $v_n$ for $n>2$ can be measured. It also turned out that Bose-Einstein (HBT) correlation radii also show 3rd order oscillations if measured versus the third order event plane $\\Psi_3$. In this paper we investigate how these observables can be described via analytic hydro solutions and hydro parameterizations. We also investigate the time evolution of asymmetry coefficients and the mixing of velocity field asymmetries and density asymmetries.
Stochastic models for turbulent reacting flows
Kerstein, A. [Sandia National Laboratories, Livermore, CA (United States)
1993-12-01T23:59:59.000Z
The goal of this program is to develop and apply stochastic models of various processes occurring within turbulent reacting flows in order to identify the fundamental mechanisms governing these flows, to support experimental studies of these flows, and to further the development of comprehensive turbulent reacting flow models.
A bulk-flow model of angled injection Lomakin bearings
Soulas, Thomas Antoine Theo
2001-01-01T23:59:59.000Z
A bulk-flow model for determination of the leakage and dynamic force characteristics of angled injection Lomakin bearings is presented. Zeroth- and first-order equations describe the equilibrium flow for a centered bearing and the perturbed flow...
Conjugate flow action functionals
Venturi, Daniele, E-mail: daniele-venturi@brown.edu [Division of Applied Mathematics, Brown University, Rhode Island 02912 (United States)] [Division of Applied Mathematics, Brown University, Rhode Island 02912 (United States)
2013-11-15T23:59:59.000Z
We present a new general framework to construct an action functional for a non-potential field theory. The key idea relies on representing the governing equations relative to a diffeomorphic flow of curvilinear coordinates which is assumed to be functionally dependent on the solution field. Such flow, which will be called the conjugate flow, evolves in space and time similarly to a physical fluid flow of classical mechanics and it can be selected in order to symmetrize the Gâteaux derivative of the field equations with respect to suitable local bilinear forms. This is equivalent to requiring that the governing equations of the field theory can be derived from a principle of stationary action on a Lie group manifold. By using a general operator framework, we obtain the determining equations of such manifold and the corresponding conjugate flow action functional. In particular, we study scalar and vector field theories governed by second-order nonlinear partial differential equations. The identification of transformation groups leaving the conjugate flow action functional invariant could lead to the discovery of new conservation laws in fluid dynamics and other disciplines.
Publications Order Form Order by Mail
Brown, Sally
.S. Pacific Northwest Future Prospects for Western Washington's Timber Supply Forest Fertilization: Sustaining;Shipping Information US Postage: fee is $6.00 per order + $2.00 per book ordered Federal Express: charges vary according to weight and service level. If you wish to have your order shipped using this method
Constructing higher-order hydrodynamics: The third order
Sašo Grozdanov; Nikolaos Kaplis
2015-07-19T23:59:59.000Z
Hydrodynamics can be formulated as the gradient expansion of conserved currents in terms of the fundamental fields describing the near-equilibrium fluid flow. In the relativistic case, the Navier-Stokes equations follow from the conservation of the stress-energy tensor to first order in derivatives. In this paper, we go beyond the presently understood second-order hydrodynamics and discuss the systematisation of obtaining the hydrodynamic expansion to an arbitrarily high order. As an example of the algorithm that we present, we fully classify the gradient expansion at third order for neutral fluids in four dimensions, thus finding the most general next-to-leading-order corrections to the relativistic Navier-Stokes equations in curved space-time. In the process, we list $20$ new transport coefficients in the conformal and $68$ in the non-conformal case, without considering any constraints that could potentially arise from the entropy current analysis. We also obtain the third-order corrections to the linear dispersion relations that describe the propagation of diffusion and sound waves in relativistic fluids. We apply our results to the energy-momentum transport in the $\\mathcal{N}=4$ supersymmetric Yang-Mills fluid at infinite 't Hooft coupling and infinite number of colours, to find the values of two new conformal transport coefficients.
Constructing higher-order hydrodynamics: The third order
Grozdanov, Sašo
2015-01-01T23:59:59.000Z
Hydrodynamics can be formulated as the gradient expansion of conserved currents, in terms of the fundamental fields describing the near-equilibrium fluid flow. In the relativistic case, the Navier-Stokes equations follow from the conservation of the stress-energy tensor to first order in derivatives. In this paper, we go beyond the presently understood second-order hydrodynamics and discuss the systematisation of obtaining the hydrodynamic expansion to an arbitrarily high order. As an example, we fully classify the gradient expansion at third order for neutral fluids in four dimensions, thus finding the most general next-to-leading-order corrections to the relativistic Navier-Stokes equations. In the process, we list $20$ new transport coefficients in the conformal and $68$ in the non-conformal case. We also obtain the third-order corrections to the linear dispersion relations that describe the propagation of diffusion and sound waves in relativistic fluids. We apply our results to the energy-momentum transpo...
McEligot, D.M.; Condie, K.G.; Foust, T.D.; McCreery, G.E.; Pink, R.J.; Stacey, D.E. (INEEL); Shenoy, A.; Baccaglini, G. (General Atomics); Pletcher, R.H. (Iowa State U.); Wallace, J.M.; Vukoslavcevic, P. (U. Maryland); Jackson, J.D. (U. Manchester, UK); Kunugi, T. (Kyoto U., Japan); Satake, S.-i. (Tokyo U. Science, Japan)
2002-12-31T23:59:59.000Z
The ultimate goal of the study is the improvement of predictive methods for safety analyses and design of advanced reactors for higher efficiency and enhanced safety and for deployable reactors for electrical power generation, process heat utilization and hydrogen generation. While key applications would be advanced gas-cooled reactors (AGCRs) using the closed Brayton cycle (CBC) for higher efficiency (such as the proposed Gas Turbine - Modular Helium Reactor (GT-MHR) of General Atomics [Neylan and Simon, 1996]), results of the proposed research should also be valuable in reactor systems with supercritical flow or superheated vapors, e.g., steam. Higher efficiency leads to lower cost/kwh and reduces life-cycle impacts of radioactive waste (by reducing waters/kwh). The outcome will also be useful for some space power and propulsion concepts and for some fusion reactor concepts as side benefits, but they are not the thrusts of the investigation. The objective of the project is to provide fundamental thermal fluid physics knowledge and measurements necessary for the development of the improved methods for the applications.
Morozov, Victor (Manassas, VA)
2011-01-18T23:59:59.000Z
A flow chamber having a vacuum chamber and a specimen chamber. The specimen chamber may have an opening through which a fluid may be introduced and an opening through which the fluid may exit. The vacuum chamber may have an opening through which contents of the vacuum chamber may be evacuated. A portion of the flow chamber may be flexible, and a vacuum may be used to hold the components of the flow chamber together.
Liles, D.R.
1982-01-01T23:59:59.000Z
Internal boundaries in multiphase flow greatly complicate fluid-dynamic and heat-transfer descriptions. Different flow regimes or topological configurations can have radically dissimilar interfacial and wall mass, momentum, and energy exchanges. To model the flow dynamics properly requires estimates of these rates. In this paper the common flow regimes for gas-liquid systems are defined and the techniques used to estimate the extent of a particular regime are described. Also, the current computer-code procedures are delineated and introduce a potentially better method is introduced.
Yu. N. Bratkov
2008-11-19T23:59:59.000Z
In this paper geology and planetology are considered using new conceptual basis of high-speed flow dynamics. Recent photo technics allow to see all details of a flow, 'cause the flow is static during very short time interval. On the other hand, maps and images of many planets are accessible. Identity of geological flows and high-speed gas dynamics is demonstrated. There is another time scale, and no more. All results, as far as the concept, are new and belong to the author. No formulae, pictures only.
Sawan, Samuel P. (Tyngsborough, MA); Talhi, Abdelhafid (Rochester, MI); Taylor, Craig M. (Jemez Springs, NM)
1998-08-25T23:59:59.000Z
The invention features polymers with increased order, and methods of making them featuring a dense gas.
O RNL/TM -2000/152 Costs ofO ilD e pe nde nce
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1 EMPIRICAL ESTIMATES OF PRICE SLOPES AND ADJUSTMENT RATES OF OIL SUPPLY AND DEMAND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 #12;#12;v LIST O FFIGURES Figure 1. Oil Price and Economic Growth, 1970 Prices . . . . 18 Table 2. Estimates of the Price Elasticity of GDP with Respect to the Price of Crude
UNIFIED FINITE ELEMENT DISCRETIZATIONS OF COUPLED DARCY-STOKES FLOW
Winther, Ragnar
order elliptic equation derived form Darcy's law in the rest of the domain, and where the solutions. The term "coupled DarcyÂStokes flow" refers to a flow which is governed by the Stokes equations in one part of the domain, while the flow reduces to a standard second order elliptic equation, derived from Darcy's law
Charge flow model for atomic ordering in nonisovalent alloys (Journal
Office of Scientific and Technical Information (OSTI)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23TribalInformationConference: Catalytic Nanomotors andof HighNBG-18 (JournalArticle) | DOE
Second-order Schemes for Steady Weakly Compressible Liquid Flows
Grant, P. W.
for erosion in steam turbines. During recovery and exploration of petroleum, quantities extracted depend upon
Dynamic reduced order modeling of entrained flow gasifiers
Monaghan, Rory F. D. (Rory Francis Desmond)
2010-01-01T23:59:59.000Z
Gasification-based energy systems coupled with carbon dioxide capture and storage technologies have the potential to reduce greenhouse gas emissions from continued use of abundant and secure fossil fuels. Dynamic reduced ...
Order Acceptance and Scheduling Problem in Two-machine Flow ...
2014-07-30T23:59:59.000Z
Jul 30, 2014 ... We denote the net revenue, i.e., the difference between the revenue ... The net revenue of job i is ..... i , then its net revenue is zero, i.e., ?i = 0.
Microsoft Word - Wind Industry Work Order Information Flow Survey...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Sandia Jame MUIR DAT dust ation ems W a Natio es Parle, Jona 1 TA SYSTEMS try W n Flo Wind E onal La athan Gibson 1042013 S, INC. Wor ow Energy aborato n, Chad Reese rk O Sur y...
Van den Engh, G.
1995-11-07T23:59:59.000Z
A Faraday cage is described which encloses the flow chamber of a cytometer. Ground planes associated with each field deflection plate inhibit electric fields from varying the charge on designated events/droplets and further concentrates. They also increase forces applied to a passing charged event for accurate focus while concomitantly inhibiting a potential shock hazard. 4 figs.
Development of an Information Flow Mechanism for Commissioning
Miyata, M.; Yoshida, H.; Yoshida, H.
2008-01-01T23:59:59.000Z
The present paper proposes a new information flow mechanism for commissioning and develops tools to make the proposed information flow mechanism feasible. Although many technical tools have been developed in order to reduce the amount of labor...
Domain decomposition preconditioners for higher-order discontinuous Galerkin discretizations
Diosady, Laslo Tibor
2012-01-01T23:59:59.000Z
Aerodynamic flows involve features with a wide range of spatial and temporal scales which need to be resolved in order to accurately predict desired engineering quantities. While computational fluid dynamics (CFD) has ...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
69 Rate Order Western is proposing adjustments to the Salt Lake City Area Integrated Projects firm power rate and the Colorado River Storage Project Transmission and ancillary...
Structural power flow measurement
Falter, K.J.; Keltie, R.F.
1988-12-01T23:59:59.000Z
Previous investigations of structural power flow through beam-like structures resulted in some unexplained anomalies in the calculated data. In order to develop structural power flow measurement as a viable technique for machine tool design, the causes of these anomalies needed to be found. Once found, techniques for eliminating the errors could be developed. Error sources were found in the experimental apparatus itself as well as in the instrumentation. Although flexural waves are the carriers of power in the experimental apparatus, at some frequencies longitudinal waves were excited which were picked up by the accelerometers and altered power measurements. Errors were found in the phase and gain response of the sensors and amplifiers used for measurement. A transfer function correction technique was employed to compensate for these instrumentation errors.
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
1995-10-16T23:59:59.000Z
The order prescribes the process for development of Policy Statements, Orders, Notices, Manuals and Guides, which are intended to guide, inform, and instruct employees in the performance of their jobs, and enable them to work effectively within the Department and with agencies, contractors, and the public.
Recurrent flow analysis in spatiotemporally chaotic 2-dimensional Kolmogorov flow
Dan Lucas; Rich Kerswell
2015-04-01T23:59:59.000Z
Motivated by recent success in the dynamical systems approach to transitional flow, we study the efficiency and effectiveness of extracting simple invariant sets (recurrent flows) directly from chaotic/turbulent flows and the potential of these sets for providing predictions of certain statistics of the flow. Two-dimensional Kolmogorov flow (the 2D Navier-Stokes equations with a sinusoidal body force) is studied both over a square [0, 2{\\pi}]2 torus and a rectangular torus extended in the forcing direction. In the former case, an order of magnitude more recurrent flows are found than previously (Chandler & Kerswell 2013) and shown to give improved predictions for the dissipation and energy pdfs of the chaos via periodic orbit theory. Over the extended torus at low forcing amplitudes, some extracted states mimick the statistics of the spatially-localised chaos present surprisingly well recalling the striking finding of Kawahara & Kida (2001) in low-Reynolds-number plane Couette flow. At higher forcing amplitudes, however, success is limited highlighting the increased dimensionality of the chaos and the need for larger data sets. Algorithmic developments to improve the extraction procedure are discussed.
Smoothness monitors for compressible flow computation
Sjogreen, B; Yee, H C
2008-09-02T23:59:59.000Z
In [SY04, YS07] and references cited therein, the authors introduced the concept of employing multiresolution wavelet decomposition of computed flow data as smoothness monitors (flow sensors) to indicate the amount and location of built-in numerical dissipation that can be eliminated or further reduced in shock-capturing schemes. Studies indicated that this approach is able to limit the use of numerical dissipation with improved accuracy compared with standard shock-capturing methods. The studies in [SY04, YS07] were limited to low order multiresolution redundant wavelets with low level supports and low order vanishing moments. The objective of this paper is to expand the previous investigation to include higher order redundant wavelets with larger support and higher order vanishing moments for a wider spectrum of flow type and flow speed applications.
Membrane-less hydrogen bromine flow battery
Braff, William
In order for the widely discussed benefits of flow batteries for electrochemical energy storage to be applied at large scale, the cost of the electrochemical stack must come down substantially. One promising avenue for ...
Ordered transport and identification of particles
Shera, E.B.
1993-05-11T23:59:59.000Z
A method and apparatus are provided for application of electrical field gradients to induce particle velocities to enable particle sequence and identification information to be obtained. Particle sequence is maintained by providing electroosmotic flow for an electrolytic solution in a particle transport tube. The transport tube and electrolytic solution are selected to provide an electroosmotic radius of >100 so that a plug flow profile is obtained for the electrolytic solution in the transport tube. Thus, particles are maintained in the same order in which they are introduced in the transport tube. When the particles also have known electrophoretic velocities, the field gradients introduce an electrophoretic velocity component onto the electroosmotic velocity. The time that the particles pass selected locations along the transport tube may then be detected and the electrophoretic velocity component calculated for particle identification. One particular application is the ordered transport and identification of labeled nucleotides sequentially cleaved from a strand of DNA.
Superconductors with Topological Order
M. C. Diamantini; P. Sodano; C. A. Trugenberger
2005-11-18T23:59:59.000Z
We propose a mechanism of superconductivity in which the order of the ground state does not arise from the usual Landau mechanism of spontaneous symmetry breaking but is rather of topological origin. The low-energy effective theory is formulated in terms of emerging gauge fields rather than a local order parameter and the ground state is degenerate on topologically non-trivial manifolds. The simplest example of this mechanism of superconductivty is concretely realized as global superconductivty in Josephson junction arrays.
Implicit runge-kutta methods to simulate unsteady incompressible flows
Ijaz, Muhammad
2009-05-15T23:59:59.000Z
A numerical method (SIMPLE DIRK Method) for unsteady incompressible viscous flow simulation is presented. The proposed method can be used to achieve arbitrarily high order of accuracy in time-discretization which is otherwise limited to second order...
An arbitrarily high-order, unstructured, free-wake panel solver
Moore, John Pease, IV
2013-01-01T23:59:59.000Z
A high-order panel code capable of solving the potential flow equation about arbitrary curved geometries is presented. A new method for integrating curved, high-order panels using adaptive Gaussian quadrature is detailed. ...
Symmetry and Topological Order
Zohar Nussinov; Gerardo Ortiz
2014-10-22T23:59:59.000Z
We prove sufficient conditions for Topological Quantum Order at both zero and finite temperatures. The crux of the proof hinges on the existence of low-dimensional Gauge-Like Symmetries (that notably extend and differ from standard local gauge symmetries) and their associated defects, thus providing a unifying framework based on a symmetry principle. These symmetries may be actual invariances of the system, or may emerge in the low-energy sector. Prominent examples of Topological Quantum Order display Gauge-Like Symmetries. New systems exhibiting such symmetries include Hamiltonians depicting orbital-dependent spin exchange and Jahn-Teller effects in transition metal orbital compounds, short-range frustrated Klein spin models, and p+ip superconducting arrays. We analyze the physical consequences of Gauge-Like Symmetries (including topological terms and charges), discuss associated braiding, and show the insufficiency of the energy spectrum, topological entanglement entropy, maximal string correlators, and fractionalization in establishing Topological Quantum Order. General symmetry considerations illustrate that not withstanding spectral gaps, thermal fluctuations may impose restrictions on certain suggested quantum computing schemes and lead to "thermal fragility". Our results allow us to go beyond standard topological field theories and engineer systems with Topological Quantum Order.
Development of a model to predict flow oscillations in low-flow sodium boiling
Levin, Alan Edward
1980-01-01T23:59:59.000Z
An experimental and analytical program has been carried out in order to better understand the cause and effect of flow oscillations in boiling sodium systems. These oscillations have been noted in previous experiments with ...
High Order Upwind Schemes for Multidimensional Magnetohydrodynamics
P. Londrillo; L. Del Zanna
1999-10-05T23:59:59.000Z
A general method for constructing high order upwind schemes for multidimensional magnetohydrodynamics (MHD), having as a main built-in condition the divergence-free constraint $\\divb=0$ for the magnetic field vector $\\bb$, is proposed. The suggested procedure is based on {\\em consistency} arguments, by taking into account the specific operator structure of MHD equations with respect to the reference Euler equations of gas-dynamics. This approach leads in a natural way to a staggered representation of the $\\bb$ field numerical data where the divergence-free condition in the cell-averaged form, corresponding to second order accurate numerical derivatives, is exactly fulfilled. To extend this property to higher order schemes, we then give general prescriptions to satisfy a $(r+1)^{th}$ order accurate $\\divb=0$ relation for any numerical $\\bb$ field having a $r^{th}$ order interpolation accuracy. Consistency arguments lead also to a proper formulation of the upwind procedures needed to integrate the induction equations, assuring the exact conservation in time of the divergence-free condition and the related continuity properties for the $\\bb$ vector components. As an application, a third order code to simulate multidimensional MHD flows of astrophysical interest is developed using ENO-based reconstruction algorithms. Several test problems to illustrate and validate the proposed approach are finally presented.
Cumulant expansions for atmospheric flows
Ait-Chaalal, Farid; Meyer, Bettina; Marston, J B
2015-01-01T23:59:59.000Z
The equations governing atmospheric flows are nonlinear, and consequently the hierarchy of cumulant equations is not closed. But because atmospheric flows are inhomogeneous and anisotropic, the nonlinearity may manifests itself only weakly through interactions of mean fields with disturbances such as thermals or eddies. In such situations, truncations of the hierarchy of cumulant equations hold promise as a closure strategy. We review how truncations at second order can be used to model and elucidate the dynamics of turbulent atmospheric flows. Two examples are considered. First, we study the growth of a dry convective boundary layer, which is heated from below, leading to turbulent upward energy transport and growth of the boundary layer. We demonstrate that a quasilinear truncation of the equations of motion, in which interactions of disturbances among each other are neglected but interactions with mean fields are taken into account, can successfully capture the growth of the convective boundary layer. Seco...
Marcos, Ph.D. Massachusetts Institute of Technology
2011-01-01T23:59:59.000Z
Bacteria are ubiquitous and play a critical role in many contexts. Their environment is nearly always dynamic due to the prevalence of fluid flow: creeping flow in soil, highly sheared flow in bodily conduits, and turbulent ...
Yoder, Graydon L.
1980-01-01T23:59:59.000Z
Dispersed flow consists of small liquid droplets entrained in a flowing vapor. This flow regime can occur in cryogenic equipment, in steam generators, and during nuclear reactor loss of coolant accidents. A theoretical ...
FLOW-THROUGH POROUS ELECTRODES
Trainham, III, James Arthur
2011-01-01T23:59:59.000Z
porous electrodes A flow-redox battery using flow-by porousconfigurations for flow redox battery applications: (i) thetrue in battery applications, Flow..through porous
Multiphase flow calculation software
Fincke, James R. (Idaho Falls, ID)
2003-04-15T23:59:59.000Z
Multiphase flow calculation software and computer-readable media carrying computer executable instructions for calculating liquid and gas phase mass flow rates of high void fraction multiphase flows. The multiphase flow calculation software employs various given, or experimentally determined, parameters in conjunction with a plurality of pressure differentials of a multiphase flow, preferably supplied by a differential pressure flowmeter or the like, to determine liquid and gas phase mass flow rates of the high void fraction multiphase flows. Embodiments of the multiphase flow calculation software are suitable for use in a variety of applications, including real-time management and control of an object system.
Barter, Garrett Ehud
The accurate simulation of supersonic and hypersonic flows is well suited to higher-order (p > 1), adaptive computational fluid dynamics (CFD). Since these cases involve flow velocities greater than the speed of sound, an ...
Barter, Garrett E. (Garrett Ehud), 1979-
2008-01-01T23:59:59.000Z
The accurate simulation of supersonic and hypersonic flows is well suited to higher-order (p > 1), adaptive computational fluid dynamics (CFD). Since these cases involve flow velocities greater than the speed of sound, an ...
Higher--Order Lagrangian Perturbation Theory
T. Buchert
1994-03-11T23:59:59.000Z
Fundamental assumptions which form the basis of models for large-scale structure in the Universe are sketched in light of a Lagrangian description of inhomogeneities. This description is introduced for Newtonian self-gravitating flows. On its basis a Lagrangian perturbation approach is discussed and compared with the standard Eulerian theory of gravitational instability. The performance of Lagrangian perturbation solutions up to the third order is demonstrated in comparison with numerical N-body simulations. First results of this comparison are presented for large scales (PM-code) and for small scales (tree-code).
Kaiper, G V
2003-11-21T23:59:59.000Z
This report covers the following: (1) Explanation of Charts Showing Freshwater Flow in 1995; (2) Estimated U.S. Freshwater Flow in 1995 (chart); (3) Estimated California Freshwater Flow in 1995 (chart); (4) Estimated New Mexico Freshwater Flow in 1995 (chart); and (5) Web locations and credits.
Portable wastewater flow meter
Hunter, Robert M. (320 S. Wilson Ave., Bozeman, MT 59715)
1999-02-02T23:59:59.000Z
A portable wastewater flow meter particularly adapted for temporary use at a single location in measuring the rate of liquid flow in a circular entrance conduit of a sewer manhole both under free flow and submerged, open channel conditions and under fill pipe, surcharged conditions, comprising an apparatus having a cylindrical external surface and an inner surface that constricts the flow through the apparatus in such a manner that a relationship exists between (1) the difference between the static pressure head of liquid flowing through the entrance of the apparatus and the static pressure head of liquid flowing through the constriction, and (2) the rate of liquid flow through the apparatus.
Portable wastewater flow meter
Hunter, Robert M. (320 S. Wilson Ave., Bozeman, MT 59715)
1990-01-01T23:59:59.000Z
A portable wastewater flow meter particularly adapted for temporary use at a single location in measuring the rate of liquid flow in a circular entrance conduit of a sewer manhole both under free flow and submerged, open channel conditions and under full pipe, surcharged conditions, comprising an apparatus having a cylindrical external surface and an inner surface that constricts the flow through the apparatus in such a manner that a relationship exists between (1) the difference between the static pressure head of liquid flowing through the entrance of the apparatus and the static pressure head of liquid flowing through the constriction, and (2) the rate of liquid flow through the apparatus.
Automatic Linear Orders (Revised Version)
Stephan, Frank
CDMTCS Research Report Series Automatic Linear Orders and Trees (Revised Version) Bakhadyr; Automatic Linear Orders and Trees Bakhadyr Khoussainov, Sasha Rubin and Frank Stephan November 13, 2003 emphasis is on trees and linear orders. We study the relationship between automatic linear orders and trees
DFSP - a data flow signal processor
Hartimo, I.; Simula, O.; Skytta, J.; Kronlof, K.
1986-01-01T23:59:59.000Z
The concept of data flow computing is applied to digital signal processing (DSP). A data flow signal processor (DFSP) architecture is presented. The principles of data flow computing are carefully considered in order to conform with the special properties of DSP. The bus oriented architecture is easily configured to meet various performance requirements. The DFSP architecture is most suitable for nonrecursive algorithms. Typical tasks of this nature are transforms and FIR filters. A simulation model of the DFSP architecture has been developed. Simulation results of two application examples are given. 24 references.
Wet Sand flows better than dry sand
Jorge E. Fiscina; Christian Wagner
2007-11-19T23:59:59.000Z
We investigated the yield stress and the apparent viscosity of sand with and without small amounts of liquid. By pushing the sand through a tube with an enforced Poiseuille like profile we minimize the effect of avalanches and shear localization. We find that the system starts to flow when a critical shear of the order of one particle diameter is exceeded. In contrast to common believe, we observe that the resistance against the flow of wet sand is much smaller than that of dry sand. For the dissipative flow we propose a non-equilibrium state equation for granular fluids.
Package Order (ECC-C) 1 Package Order
Wagner, Stephan
Package Order (ECC-C) 1 Package Order for use with framework contracts based on the NEC3 ECC: Construction and refurbishment of buildings in the Tshimologong Precinct - Braamfontein Package Order No: 1 Title of Work Package: Tshimologong Precinct - Phase 1 Contract Data associated with a Work Package Part
Power plant degradation : a modular secondary plant and integral flow accelerated corrosion model
Van der Helm, Mark Johan, 1972-
2001-01-01T23:59:59.000Z
Flow Accelerated Corrosion (FAC) is the most prevalent material degradation mechanism for low carbon steel in steam-water flow systems. The band of uncertainty in predictions of wear rate due to FAC spans one to two orders ...
DNS of flow past a stationary and oscillating cylinder at Re ¼ 10 000
2005-06-01T23:59:59.000Z
Keywords: Flow structure interaction; Vortex induced vibration; Cylinder flow; High ... methods, and low-order upwind schemes are observed to fail to predict several .... overhead and enables the applications to scale to a large number of ...
A swirling jet under the influence of a coaxial flow
Giannadakis, A.; Perrakis, K.; Panidis, Th. [University of Patras, Department of Mechanical Engineering and Aeronautics, Laboratory of Applied Thermodynamics (Greece)
2008-09-15T23:59:59.000Z
The recirculating flow field generated by a swirling jet and a coaxial annular stream entering a pipe is investigated with the use of 2D-DPIV. Parametric change of inlet flow rates (constant tangential injection with change of annular flow and vice versa) is being considered in order to study the mean and turbulent flow field. A recirculation bubble stabilized close to the swirler exit is the dominating feature of the interaction between the inner swirling jet and the annular stream. Results are discussed in terms of bubble topology and dynamics on the basis of a modified Rossby number that appears to describe the trends of the complex flow field. (author)
Semjon Adlaj
2011-10-03T23:59:59.000Z
A formula expressing a point of order 8 on an elliptic curve, in terms of the roots of the associated cubic polynomial, is given. Doubling such a point yields a point of order 4 distinct from the well-known points of order 4 given in standard references such as "A course of Modern Analysis" by Whittaker and Watson.
Ultrasonic flow metering system
Gomm, Tyler J. (Meridian, ID); Kraft, Nancy C. (Idaho Falls, ID); Mauseth, Jason A. (Pocatello, ID); Phelps, Larry D. (Pocatello, ID); Taylor, Steven C. (Idaho Falls, ID)
2002-01-01T23:59:59.000Z
A system for determining the density, flow velocity, and mass flow of a fluid comprising at least one sing-around circuit that determines the velocity of a signal in the fluid and that is correlatable to a database for the fluid. A system for determining flow velocity uses two of the inventive circuits with directional transmitters and receivers, one of which is set at an angle to the direction of flow that is different from the others.
McFarland, Andrew R. (College Station, TX); Rodgers, John C. (Santa Fe, NM); Ortiz, Carlos A. (Bryan, TX); Nelson, David C. (Santa Fe, NM)
1994-01-01T23:59:59.000Z
Elbow mass flow meter. The present invention includes a combination of an elbow pressure drop generator and a shunt-type mass flow sensor for providing an output which gives the mass flow rate of a gas that is nearly independent of the density of the gas. For air, the output is also approximately independent of humidity.
Miles, Robin R. (Danville, CA); Benett, William J. (Livermore, CA); Coleman, Matthew A. (Oakland, CA); Pearson, Francesca S. (Livermore, CA); Nasarabadi, Shanavaz L. (Livermore, CA)
2011-03-08T23:59:59.000Z
A lateral flow strip assay apparatus comprising a housing; a lateral flow strip in the housing, the lateral flow strip having a receiving portion; a sample collection unit; and a reagent reservoir. Saliva and/or buccal cells are collected from an individual using the sample collection unit. The sample collection unit is immersed in the reagent reservoir. The tip of the lateral flow strip is immersed in the reservoir and the reagent/sample mixture wicks up into the lateral flow strip to perform the assay.
Aerothermodynamics and operation of turbine system under unsteady pulsating flow
Lee, Jinwook, S.M. Massachusetts Institute of Technology
2015-01-01T23:59:59.000Z
An assessment of a turbine system operating under highly pulsating flow environment typically found in vehicular turbochargers is made to: identify the key operating parameters, enable the formulation of a reduced order ...
Bell, Geoffrey C. (Pleasant Hill, CA); Feustel, Helmut E. (Albany, CA); Dickerhoff, Darryl J. (Berkeley, CA)
2002-01-01T23:59:59.000Z
A fume hood is provided having an adequate level of safety while reducing the amount of air exhausted from the hood. A displacement flow fume hood works on the principal of a displacement flow which displaces the volume currently present in the hood using a push-pull system. The displacement flow includes a plurality of air supplies which provide fresh air, preferably having laminar flow, to the fume hood. The displacement flow fume hood also includes an air exhaust which pulls air from the work chamber in a minimally turbulent manner. As the displacement flow produces a substantially consistent and minimally turbulent flow in the hood, inconsistent flow patterns associated with contaminant escape from the hood are minimized. The displacement flow fume hood largely reduces the need to exhaust large amounts of air from the hood. It has been shown that exhaust air flow reductions of up to 70% are possible without a decrease in the hood's containment performance. The fume hood also includes a number of structural adaptations which facilitate consistent and minimally turbulent flow within a fume hood.
Method and apparatus for controlling fluid flow
Miller, J.R.
1980-06-27T23:59:59.000Z
A method and apparatus for precisely controlling the rate (and hence amount) of fluid flow are given. The controlled flow rate is finely adjustable, can be extremely small (on the order of microliter-atmospheres per second), can be adjusted to zero (flow stopped), and is stable to better than 1% with time. The dead volume of the valve can be made arbitrarily small, in fact essentially zero. The valve employs no wearing mechanical parts (including springs, stems, or seals). The valve is finely adjustable, has a flow rate dynamic range of many decades, can be made compatible with any fluid, and is suitable for incorporation into an open or closed loop servo-control system.
Membrane-less hydrogen bromine flow battery
Braff, W A; Buie, C R
2014-01-01T23:59:59.000Z
In order for the widely discussed benefits of flow batteries for electrochemical energy storage to be applied at large scale, the cost of the electrochemical stack must come down substantially. One promising avenue for reducing stack cost is to increase the system power density while maintaining efficiency, enabling smaller stacks. Here we report on a membrane-less, hydrogen bromine laminar flow battery as a potential high power density solution. The membrane-less design enables power densities of 0.795 W cm$^{-2}$ at room temperature and atmospheric pressure, with a round-trip voltage efficiency of 92\\% at 25\\% of peak power. Theoretical solutions are also presented to guide the design of future laminar flow batteries. The high power density achieved by the hydrogen bromine laminar flow battery, along with the potential for rechargeable operation, will translate into smaller, inexpensive systems that could revolutionize the fields of large-scale energy storage and portable power systems.
SINGULARITIES IN HELESHAW FLOWS DRIVEN BY A MULTIPOLE
Nie, Qing
SINGULARITIES IN HELEÂSHAW FLOWS DRIVEN BY A MULTIPOLE QING NIE AND FEI-RAN TIAN SIAM J. APPL. MATH, analytically and numerically, singularity formation in an interface flow driven by a multipole for a two in the case of a dipole. For a multipole of a higher order, we show that the solution does not tend to any
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasma | Department ofEnergy 9 LehmanDepartment of EnergyOAHUensure that theORAU South Campus|
On the scalability of the Albany/FELIX first-order Stokes approximatio...
Office of Scientific and Technical Information (OSTI)
developed AlbanyFELIX finite-element based code for the first-order Stokes momentum balance equations for ice flow. We focus our analysis on the performance of two possible...
Exploration of Opportunities to Reduce Lead Times for Engineered-to-Order Products
Tommelein, Iris D.
for Engineered-To-Order (ETO) products. This research applies Transformation-Flow-Value (TFV) theory and lean not only in the procurement phase but also in the design and manufacturing phases, e.g., by forcing people
Two-Phase Flow Pressure Drop of High Quality Steam
Curtis, J. M.; Coffield, R. D.
2001-10-01T23:59:59.000Z
Two-phase pressure drop across a straight test pipe was experimentally determined for high Reynolds (Re) number steam flow for a flow quality range of 0.995 to 1.0. The testing described has been performed in order to reduce uncertainties associated with the effects of two-phase flow on pressure drop. Two-phase flow develops in steam piping because a small fraction of the steam flow condenses due to heat loss to the surroundings. There has been very limited two-phase pressure drop data in open literature for the tested flow quality range. The two-phase pressure drop data obtained in this test has enabled development of a correlation between friction factor, Reynolds number, and flow quality.
Flow patterns in vertical two-phase flow
McQuillan, K.W.; Whalley, P.B.
1985-03-01T23:59:59.000Z
This paper is concerned with the flow patterns which occur in upwards gas-liquid two-phase flow in vertical tubes. The basic flow patterns are described and the use of flow patter maps is discussed. The transition between plug flow and churn flow is modelled under the assumption that flooding of the falling liquid film limits the stability of plug flow. The resulting equation is combined with other flow pattern transition equations to produce theoretical flow pattern maps, which are then tested against experimental flow pattern data. Encouraging agreement is obtained.
High-order / low-order methods for ocean modeling
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Newman, Christopher; Womeldorff, Geoff; Chacón, Luis; Knoll, Dana A.
2015-01-01T23:59:59.000Z
We examine a High Order/Low Order (HOLO) approach for a z-level ocean model and show that the traditional semi-implicit and split-explicit methods, as well as a recent preconditioning strategy, can easily be cast in the framework of HOLO methods. The HOLO formulation admits an implicit-explicit method that is algorithmically scalable and second-order accurate, allowing timesteps much larger than the barotropic time scale. We show how HOLO approaches, in particular the implicit-explicit method, can provide a solid route for ocean simulation to heterogeneous computing and exascale environments.
Solids mass flow determination
Macko, Joseph E. (Hempfield Township, Westmoreland County, PA)
1981-01-01T23:59:59.000Z
Method and apparatus for determining the mass flow rate of solids mixed with a transport fluid to form a flowing mixture. A temperature differential is established between the solids and fluid. The temperature of the transport fluid prior to mixing, the temperature of the solids prior to mixing, and the equilibrium temperature of the mixture are monitored and correlated in a heat balance with the heat capacities of the solids and fluid to determine the solids mass flow rate.
Kumar S. Gupta; Siddhartha Sen
2010-06-05T23:59:59.000Z
We demonstrate the possibility of a turbulent flow of electrons in graphene in the hydrodynamic region, by calculating the corresponding turbulent probability density function. This is used to calculate the contribution of the turbulent flow to the conductivity within a quantum Boltzmann approach. The dependence of the conductivity on the system parameters arising from the turbulent flow is very different from that due to scattering.
Complex higher order derivative theories
Margalli, Carlos A.; Vergara, J. David [Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico, Apartado Postal 70-543, Mexico 04510 DF (Mexico)
2012-08-24T23:59:59.000Z
In this work is considered a complex scalar field theory with higher order derivative terms and interactions. A procedure is developed to quantize consistently this system avoiding the presence of negative norm states. In order to achieve this goal the original real scalar high order field theory is extended to a complex space attaching a complex total derivative to the theory. Next, by imposing reality conditions the complex theory is mapped to a pair of interacting real scalar field theories without the presence of higher derivative terms.
Resonant alignment of microswimmer trajectories in oscillatory shear flows
Alexander Hope; Ottavio A. Croze; Wilson C. K. Poon; Martin A. Bees; Mark D. Haw
2015-07-26T23:59:59.000Z
Oscillatory flows are common in the environment, industrial applications and rheological investigations. We experimentally characterise the response of the alga {\\it Dunaliella salina} to oscillatory shear and squeeze flows, and report the surprising discovery that algal swimming trajectories orient perpendicular to the flow-shear plane. The ordering has the characteristics of a resonance in the driving parameter space, which is qualitatively reproduced by a model accounting for helical swimming. Our discovery challenges current understanding of swimmers in flows and provides the foundations for the oscillatory rheology of active suspensions, of particular relevance to algal processing applications.
Resonant alignment of microswimmer trajectories in oscillatory shear flows
Hope, Alexander; Poon, Wilson C K; Bees, Martin A; Haw, Mark D
2015-01-01T23:59:59.000Z
Oscillatory flows are common in the environment, industrial applications and rheological investigations. We experimentally characterise the response of the alga {\\it Dunaliella salina} to oscillatory shear and squeeze flows, and report the surprising discovery that algal swimming trajectories orient perpendicular to the flow-shear plane. The ordering has the characteristics of a resonance in the driving parameter space, which is qualitatively reproduced by a model accounting for helical swimming. Our discovery challenges current understanding of swimmers in flows and provides the foundations for the oscillatory rheology of active suspensions, of particular relevance to algal processing applications.
2015 orders | Department of Energy
Office of Environmental Management (EM)
ord3675 ord3676 ord3677 ord3678 ord3679 ord3680 errata3487 tolling rehearing 12-97-NG Tolling Order 11-128-LNG ord3681 ord3682 More Documents & Publications CAMERON LNG, LLC...
Whirlpool: Order (2014-CE-21010)
Broader source: Energy.gov [DOE]
DOE ordered Whirlpool Corporation to pay a $8,000 civil penalty after finding Whirlpool had failed to certify that certain models of residential clothes dryers comply with the applicable energy conservation standards.
Broader source: Energy.gov [DOE]
DOE ordered TMP Manufacturing Company, Inc. to pay a $8,000 civil penalty after finding TMP had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Author Order and Research Quality
Kissan, Joseph; Laband, David N.; Patil, Vivek
2005-01-01T23:59:59.000Z
We observe a great deal of heterogeneity in the manner in which author orderings are assigned both across and within academic markets. To better understand this phenomenon, we develop and analyze a stochastic model of ...
Broader source: Energy.gov [DOE]
DOE ordered BSH Home Appliances Corp. to pay a $8,000 civil penalty after finding BSH had failed to certify that certain models of residential clothes washers comply with the applicable energy/water conservation standards.
Broader source: Energy.gov [DOE]
DOE ordered Almo Corporation to pay a $6,500 civil penalty after finding Almo had failed to certify that certain models of residential refrigerators comply with the applicable energy conservation standards.
VMI vs. order based fulfillment
Shen, Victoria W
2005-01-01T23:59:59.000Z
In this thesis, two inventory fulfillment methods are compared by evaluating the vendor managed inventory (VMI) fulfillment against the current order based fulfillment. Several forms of adaptation to VMI are described. The ...
Keystone: Order (2013-CE-2601)
Broader source: Energy.gov [DOE]
DOE ordered Keystone Technologies, LLC to pay a $8,000 civil penalty after finding Keystone had failed to certify that certain models of fluorescent lamp ballasts comply with the applicable energy conservation standards.
Angular Ordering in Gluon Radiation
Jong B. Choi; Byeong S. Choi; Su K. Lee
2002-01-28T23:59:59.000Z
The assumption of angular ordering in gluon radiation is essential to obtain quantitative results concerning gluonic behaviors. In order to prove the validity of this assumption, we have applied our momentum space flux-tube formalism to check out the angular dependences of gluon radiation. We have calculated the probability amplitudes to get new gluon, and have found that the new gluon is generally expected to have the maximum amplitude when it is produced between the momentum directions of the last two partons.
Error estimation and anisotropic mesh refinement for 3d laminar aerodynamic flow simulations
Hartmann, Ralf
Error estimation and anisotropic mesh refinement for 3d laminar aerodynamic flow simulations Tobias-dimensional laminar aerodynamic flow simulations. The optimal order symmetric interior penalty discontinuous Galerkin laminar flows, see Sections 2 and 3 for the governing equations and the discretization
McFarland, A.R.; Rodgers, J.C.; Ortiz, C.A.; Nelson, D.C.
1994-08-16T23:59:59.000Z
The present invention includes a combination of an elbow pressure drop generator and a shunt-type mass flow sensor for providing an output which gives the mass flow rate of a gas that is nearly independent of the density of the gas. For air, the output is also approximately independent of humidity. 3 figs.
Microelectromechanical flow control apparatus
Okandan, Murat (NE Albuquerque, NM)
2009-06-02T23:59:59.000Z
A microelectromechanical (MEM) flow control apparatus is disclosed which includes a fluid channel formed on a substrate from a first layer of a nonconducting material (e.g. silicon nitride). A first electrode is provided on the first layer of the nonconducting material outside the flow channel; and a second electrode is located on a second layer of the nonconducting material above the first layer. A voltage applied between the first and second electrodes deforms the fluid channel to increase its cross-sectional size and thereby increase a flow of a fluid through the channel. In certain embodiments of the present invention, the fluid flow can be decreased or stopped by applying a voltage between the first electrode and the substrate. A peristaltic pumping of the fluid through the channel is also possible when the voltage is applied in turn between a plurality of first electrodes and the substrate. A MEM flow control assembly can also be formed by providing one or more MEM flow control devices on a common substrate together with a submicron filter. The MEM flow control assembly can optionally include a plurality of pressure sensors for monitoring fluid pressure and determining flow rates through the assembly.
New patterns in high-speed granular flows
Nicolas Brodu; Renaud Delannay; Alexandre Valance; Patrick Richard
2015-03-04T23:59:59.000Z
We report on new patterns in high-speed flows of granular materials obtained by means of extensive numerical simulations. These patterns emerge from the destabilization of unidirectional flows upon increase of mass holdup and inclination angle, and are characterized by complex internal structures including secondary flows, heterogeneous particle volume fraction, symmetry breaking and dynamically maintained order. In particular, we evidenced steady and fully developed "supported" flows, which consist of a dense core surrounded by a highly energetic granular gas. Interestingly, despite their overall diversity, these regimes are shown to obey a scaling law for the mass flow rate as a function of the mass holdup. This unique set of 3D flow regimes raises new challenges for extending the scope of current granular rheological models.
Equal-order finite elements with local projection stabilization for the Darcy-Brinkman equations
Schieweck, Friedhelm
Equal-order finite elements with local projection stabilization for the Darcy-Brinkman equations M. Braack and F. Schieweck Mai 2010 Abstract For the Darcy-Brinkman equations, which model porous media: Porous media flow, Darcy-Brinkman equations, Stokes, equal-order finite elements, local projection
Navon, Michael
, Reduced order modelling, Shock wave. 1. Introduction Reduced Order Model (ROM) technology is a rapidly to extract a set of modes characteristic of the database which constitutes the optimal basis energy of the flow. The leading POD modes are not able to dissipate enough energy since the main amount
A hybrid Eulerian-Lagrangian flow solver
Palha, Artur; Ferreira, Carlos Simao; van Bussel, Gerard
2015-01-01T23:59:59.000Z
Currently, Eulerian flow solvers are very efficient in accurately resolving flow structures near solid boundaries. On the other hand, they tend to be diffusive and to dampen high-intensity vortical structures after a short distance away from solid boundaries. The use of high order methods and fine grids, although alleviating this problem, gives rise to large systems of equations that are expensive to solve. Lagrangian solvers, as the regularized vortex particle method, have shown to eliminate (in practice) the diffusion in the wake. As a drawback, the modelling of solid boundaries is less accurate, more complex and costly than with Eulerian solvers (due to the isotropy of its computational elements). Given the drawbacks and advantages of both Eulerian and Lagrangian solvers the combination of both methods, giving rise to a hybrid solver, is advantageous. The main idea behind the hybrid solver presented is the following. In a region close to solid boundaries the flow is solved with an Eulerian solver, where th...
International Refrigeration: Order (2012-CE-1510) | Department...
International Refrigeration: Order (2012-CE-1510) International Refrigeration: Order (2012-CE-1510) July 20, 2012 DOE ordered International Refrigeration Products to pay an 8,000...
Magnetically stimulated fluid flow patterns
Martin, Jim; Solis, Kyle
2014-03-06T23:59:59.000Z
Sandia National Laboratories' Jim Martin and Kyle Solis explain research on the effects of magnetic fields on fluid flows and how they stimulate vigorous flows. Fluid flow is a necessary phenomenon in everything from reactors to cooling engines in cars.
Magnetically stimulated fluid flow patterns
Martin, Jim; Solis, Kyle
2014-08-06T23:59:59.000Z
Sandia National Laboratories' Jim Martin and Kyle Solis explain research on the effects of magnetic fields on fluid flows and how they stimulate vigorous flows. Fluid flow is a necessary phenomenon in everything from reactors to cooling engines in cars.
Redox Flow Batteries, a Review
Weber, Adam Z.
2013-01-01T23:59:59.000Z
of a Vanadium Redox-Flow Battery to Maintain Power Quality,"Fuel System Using Redox Flow Battery," ed: WO Patentand D. B. Hickey, "Redox Flow Battery System for Distributed
Flow Effects on Jet Energy Loss with Detailed Balance
Luan Cheng; Jia Liu; Enke Wang
2014-06-03T23:59:59.000Z
In the presence of collective flow a new model potential describing the interaction of the hard jet with scattering centers is derived based on the static color-screened Yukawa potential. The flow effect on jet quenching with detailed balance is investigated in pQCD. It turns out, considering the collective flow with velocity $v_z$ along the jet direction, the collective flow decreases the LPM destructive interference comparing to that in the static medium. The gluon absorption plays a more important role in the moving medium. The collective flow increases the energy gain from gluon absorption, however, decreases the energy loss from gluon radiation, which is $(1 - v_z )$ times as that in the static medium to the first order of opacity. In the presence of collective flow, the second order in opacity correction is relatively small compared to the first order. So that the total effective energy loss is decreased. The flow dependence of the energy loss will affect the suppression of high $p_T$ hadron spectrum and anisotropy parameter $v_2$ in high-energy heavy-ion collisions.
Flow cytometer jet monitor system
Van den Engh, Ger (Seattle, WA)
1997-01-01T23:59:59.000Z
A direct jet monitor illuminates the jet of a flow cytometer in a monitor wavelength band which is substantially separate from the substance wavelength band. When a laser is used to cause fluorescence of the substance, it may be appropriate to use an infrared source to illuminate the jet and thus optically monitor the conditions within the jet through a CCD camera or the like. This optical monitoring may be provided to some type of controller or feedback system which automatically changes either the horizontal location of the jet, the point at which droplet separation occurs, or some other condition within the jet in order to maintain optimum conditions. The direct jet monitor may be operated simultaneously with the substance property sensing and analysis system so that continuous monitoring may be achieved without interfering with the substance data gathering and may be configured so as to allow the front of the analysis or free fall area to be unobstructed during processing.
Watermark: Order (2011-SW-2908)
Broader source: Energy.gov [DOE]
DOE ordered Watermark Designs, Ltd. to pay a $4,200 civil penalty after finding Watermark Designs, Ltd. had manufactured and distributed in commerce in the U.S. sixty-three units of basic model SH-FAL90, a noncompliant showerhead.
Broader source: Energy.gov [DOE]
DOE ordered Topaz Lighting Corp. to pay a $8,000 civil penalty after finding Topaz had failed to certify that certain basic models of medium base compact fluorescent lamps, general service fluorescent lamps, and illuminated exit signs comply with the applicable energy conservation standards.
Whirlpool: Order (2013-SE-1420)
Broader source: Energy.gov [DOE]
DOE ordered Whirlpool Corporation to pay a $5,329,800 civil penalty after finding Whirlpool had manufactured and distributed in commerce in the U.S. at least 26,649 units of basic model 8TAR81 noncompliant refrigerator-freezer.
Chan, Vincent W. S.
Present-day networks are being challenged by dramatic increases in bandwidth demand of emerging applications. We will explore a new transport, ldquooptical flow switchingrdquo, that will enable significant growth and ...
Parallel flow diffusion battery
Yeh, Hsu-Chi (Albuquerque, NM); Cheng, Yung-Sung (Albuquerque, NM)
1984-08-07T23:59:59.000Z
A parallel flow diffusion battery for determining the mass distribution of an aerosol has a plurality of diffusion cells mounted in parallel to an aerosol stream, each diffusion cell including a stack of mesh wire screens of different density.
Parallel flow diffusion battery
Yeh, H.C.; Cheng, Y.S.
1984-01-01T23:59:59.000Z
A parallel flow diffusion battery for determining the mass distribution of an aerosol has a plurality of diffusion cells mounted in parallel to an aerosol stream, each diffusion cell including a stack of mesh wire screens of different density.
None
2012-05-01T23:59:59.000Z
This report documents findings from a workshop on the impacts of complex wind flows in and out of wind turbine environments, the research needs, and the challenges of meteorological and engineering modeling at regional, wind plant, and wind turbine scales.
Orderly Spectra from Random Interactions
Johnson, C.W. [Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001 (United States)] [Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001 (United States); Bertsch, G.F. [Department of Physics, FM-15, University of Washington, Seattle, Washington 98195 (United States)] [Department of Physics, FM-15, University of Washington, Seattle, Washington 98195 (United States); Dean, D.J.; Dean, D.J. [Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States) [Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States); Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001 (United States)
1998-03-01T23:59:59.000Z
We investigate the low-lying spectra of many-body systems with random two-body interactions, specifying that the ensemble be invariant under particle-hole conjugation. Surprisingly we find patterns reminiscent of more orderly interactions, such as a predominance of J=0 ground states separated by a gap from the excited states, and evidence of phonon vibrations in the low-lying spectra. {copyright} {ital 1998} {ital The American Physical Society}
Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I.Skillicorn 1 Azimuthal asymmetry
Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I.Skillicorn 1 Azimuthal asymmetry using energy flow method Azimuthal angle distribution at Q2 >100 GeV2 Energy flow method.Ukleja on behalf of the ZEUS Collaboration #12; Energy Flow Energy Flow Energy Flow A.Ukleja, T.Tymieniecka, I
Hanold, R.J.
1983-12-01T23:59:59.000Z
The two-phase flow program is directed at understanding the hydrodynamics of two-phase flows. The two-phase flow regime is characterized by a series of flow patterns that are designated as bubble, slug, churn, and annular flow. Churn flow has received very little scientific attention. This lack of attention cannot be justified because calculations predict that the churn flow pattern will exist over a substantial portion of the two-phase flow zone in producing geothermal wells. The University of Houston is experimentally investigating the dynamics of churn flow and is measuring the holdup over the full range of flow space for which churn flow exists. These experiments are being conducted in an air/water vertical two-phase flow loop. Brown University has constructed and is operating a unique two-phase flow research facility specifically designed to address flow problems of relevance to the geothermal industry. An important feature of the facility is that it is dedicated to two-phase flow of a single substance (including evaporation and condensation) as opposed to the case of a two-component two-phase flow. This facility can be operated with horizontal or vertical test sections of constant diameter or with step changes in diameter to simulate a geothermal well profile.
Flow Batteries A Historical Perspective
Flow Batteries A Historical Perspective Robert F. Savinell Case Western Reserve University Department of Chemical Engineering DOE Flow Battery Workshop March 2012 #12;2 OUTLINE ·The first flow cell? ·Review articles- documented progress ·Early NASA Work- some learning ·Fuel Cell and Flow Battery
Piezoelectric axial flow microvalve
Gemmen, Randall; Thornton, Jimmy; Vipperman, Jeffrey S.; Clark, William W.
2007-01-09T23:59:59.000Z
This invention is directed to a fuel cell operable with a quantity of fuel and a quantity of an oxidizer to produce electrical power, the fuel cell including a fuel cell body including a labyrinth system structured to permit the fuel and the oxidizer to flow therethrough; at least a first catalyst in fluid communication with the labyrinth; and at least a first microvalve operably disposed within at least a portion of the labyrinth. The microvalve utilizes a deflectable member operable upon the application of a voltage from a voltage source. The microvalve includes an elongated flow channel formed therein and extending substantially longitudinally between the first and second ends to permit substantially longitudinal flow of the fluid therethrough and between the first and second ends; and the deflectable member disposed on the valve body, the deflectable member including at least a first piezoelectric portion that is piezoelectrically operable to deflect the deflectable member between an open position and a closed position upon the application of a voltage, the deflectable member in the closed position being operable to resist the flow of the fluid through the flow channel.
ORDER FOR SUPPLIES OR SERVICES
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (Million Cubic Feet) Natural Gas DeliveredStents -(NEI)I REEECNO OF DOCUMENT BEINGthe YearORDER2
ORDER FOR SUPPLIES OR SERVICES
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (Million Cubic Feet) Natural Gas DeliveredStents -(NEI)I REEECNO OF DOCUMENT BEINGthe YearORDER23
Battelle Energy Alliance Consent Order
Office of Environmental Management (EM)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362 of Thomas P. D'Agostino2015 GTODesierto SA deAugust 5, 2010Order
Bechtel National, Inc. Consent Order
Office of Environmental Management (EM)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362 of Thomas P. D'Agostino2015 GTODesierto SA deAugust 5, 2010OrderBatteries
Public Order and Safety Buildings
Gasoline and Diesel Fuel Update (EIA)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362 334 318 706Production% of Total2003Year Jan88ThousandCubic Feet)1 436 EnergyOrder and Safety
Interplay between geometry and flow distribution in an airway tree
Mauroy, B; Sapoval, B
2003-01-01T23:59:59.000Z
Uniform fluid flow distribution in a symmetric volume can be realized through a symmetric branched tree. It is shown here, however, that the flow partitioning can be highly sensitive to deviations from exact symmetry if inertial effects are present. This is found by direct numerical simulation of the Navier-Stokes equations in a 3D tree geometry. The flow asymmetry is quantified and found to depend on the Reynolds number. Moreover, for a given Reynolds number, we show that the flow distribution depends on the aspect ratio of the branching elements as well as their angular arrangement. Our results indicate that physiological variability should be severely restricted in order to ensure uniform fluid distribution in a tree. This study suggests that any non-uniformity in the air flow distribution in human lungs should be influenced by the respiratory conditions, rest or hard exercise.
Flow Effects on Jet quenching with Detailed Balance
Luan Cheng; Enke Wang
2011-02-01T23:59:59.000Z
A new model potential in the presence of collective flow describing the interaction of the hard jet with scattering centers is derived based on the static color-screened Yukawa potential. The flow effect on jet quenching with detailed balance is investigated in pQCD. It turns out that the collective flow changes the emission current and the LPM destructive interference comparing to that in the static medium. Considering the collective flow with velocity v_z along the jet direction, the energy loss is (1 - v_z) times that in the static medium to the first order of opacity. The flow dependence of the energy loss will affect the suppression of high p_T hadron spectrum and anisotropy parameter v_2 in high-energy heavy-ion collisions.
Fast-flowing outlet glaciers on Svalbard ice caps
Dowdeswell, J.A. (Univ. of Cambridge (England)); Collin, R.L. (University College of Wales, Aberystwyth (England))
1990-08-01T23:59:59.000Z
Four well-defined outlet glaciers are present on the 2510 km{sup 2} cap of Vestfonna in Nordaustlandet, Svalbard. Airborne radio echo sounding and aerial-photograph and satellite-image analysis methods are used to analyze the morphology and dynamics of the ice cap and its component outlet glaciers. The heavily crevassed outlets form linear depressions in the ice-cap surface and flow an order of magnitude faster than the ridges of uncrevassed ice between them. Ice flow on the ridges is accounted for by internal deformation alone, whereas rates of outlet glacier flow require basal motion. One outlet has recently switched into and out of a faster mode of flow. Rapid terminal advance, a change from longitudinal compression to tension, and thinning in the upper basin indicate surge behavior. Observed outlet glacier discharge is significantly greater than current inputs of mass of the ice cap, indicating that present rates of flow cannot be sustained under the contemporary climate.
F. Combes
2007-09-02T23:59:59.000Z
The gas component plays a major role in the dynamics of spiral galaxies, because of its dissipative character, and its ability to exchange angular momentum with stars in the disk. Due to its small velocity dispersion, it triggers gravitational instabilities, and the corresponding non-axisymmetric patterns produce gravity torques, which mediate these angular momentum exchanges. When a srong bar pattern develops with the same pattern speed all over the disk, only gas inside corotation can flow towards the center. But strong bars are not long lived in presence of gas, and multiple-speed spiral patterns can develop between bar phases, and help the galaxy to accrete external gas flowing from cosmic filaments. The gas is then intermittently driven to the galaxy center, to form nuclear starbursts and fuel an active nucleus. The various time-scales of these gaseous flows are described.
Analysis of the velocity field of granular hopper flow
F. G. R. Magalhães; A. P. F. Atman; J. G. Moreira; H. J. Herrmann
2015-07-22T23:59:59.000Z
We report the analysis of radial characteristics of the flow of granular material through a conical hopper. The discharge is simulated for various orifice sizes and hopper opening angles. Velocity profiles are measured along two radial lines from the hopper cone vertex: along the main axis of the cone and along its wall. An approximate power law dependence on the distance from the orifice is observed for both profiles, although differences between them can be noted. In order to quantify these differences, we propose a Local Mass Flow index that is a promising tool in the direction of a more reliable classification of the flow regimes in hoppers.
Variable Refrigerant Flow HVAC
Jones, S.
2013-01-01T23:59:59.000Z
Variable refrigerant flow technology HVAC CATEE 2013 San Antonio, TX ESL-KT-13-12-33 CATEE 2013: Clean Air Through Energy Efficiency Conference, San Antonio, Texas Dec. 16-18 What is the acronym VRF? ? Variable Refrigerant Flow Operates like a... heat pump utilizing VFD Inverter Compressors and LEV’s Unlike conventional commercial and residential HVAC systems in the USA The predominate method of cooling and heating in the world ESL-KT-13-12-33 CATEE 2013: Clean Air Through Energy Efficiency...
Peter A. Thomas
1996-08-20T23:59:59.000Z
I discuss the multiphase nature of the intracluster medium whose neglect can lead to overestimates of the baryon fraction of clusters by up to a factor of two. The multiphase form of the cooling flow equations are derived and reduced to a simple form for a wide class of self-similar density distributions. It is shown that steady-state cooling flows are \\emph{not} consistent with all possible emissivity profiles which can therefore be used as a test of the theory. In combination, they provide strong constraints on the mass distribution within the cooling radius.
Jacobs, Gustaaf "Guus"
Computation of Normal Shocks Running into a Cloud of Particles using a High-Order Particle are studied with bronze particle cloud in the accelerated flow behind a running shock. The forty thousands particle clouds are arranged initially in a rectangular, triangular and circular shape. The flows
Pinkel, Daniel (Walnut Creek, CA)
1991-01-01T23:59:59.000Z
An obstruction across the flow chamber creates a one dimensional convergence of a sheath fluid. A passageway in the construction directs flat cells near to the area of one dimensional convergence in the sheath fluid to provide proper orientation of flat cells at fast rates.
Schwartz, Stephen E.
ENERGY FLOWS FORCINGS CLIMATE CHANGE A REALLY TOUGH PROBLEM Stephen E. Schwartz, BNL, 7-20-11 www average temperature 15Â°C or 59Â°F #12;ATMOSPHERIC RADIATION Power per area Energy per time per area Unit" temperature to radiative flux. #12;GLOBAL ENERGY BALANCE Global and annual average energy fluxes in watts per
Pinkel, D.
1987-11-30T23:59:59.000Z
An obstruction across the flow chamber creates a one-dimensional convergence of a sheath fluid. A passageway in the obstruction directs flat cells near to the area of one-dimensional convergence in the sheath fluid to provide proper orientation of flat cells at fast rates. 6 figs.
Recent advances in ordered intermetallics
Liu, C.T.
1992-12-31T23:59:59.000Z
This paper briefly summarizes recent advances in intermetallic research and development. Ordered intermetallics based on aluminides and silicides possess attractive properties for structural applications at elevated temperatures in hostile environments; however, brittle fracture and poor fracture resistance limit their use as engineering materials in many cases. In recent years, considerable efforts have been devoted to the study of the brittle fracture behavior of intermetallic alloys; as a result, both intrinsic and extrinsic factors governing brittle fracture have been identified. Recent advances in first-principles calculations and atomistic simulations further help us in understanding atomic bonding, dislocation configuration, and alloying effects in intermetallics. The basic understanding has led to the development of nickel, iron, and titanium aluminide alloys with improved mechanical and metallurgical properties for structural use. Industrial interest in ductile intermetallic alloys is high, and several examples of industrial involvement are mentioned.
Confetti Ordering by Polymer Brushes
Galen T. Pickett
2015-05-23T23:59:59.000Z
I consider the ordering of dilute platelet additives when incorporated into an end-grafted polymer brush. The competition between wetting interactions and the anisotropic stress environment of the interior of the brush causes these platelet additives to either remain suspended at the outer edge of the brush laying flat against the brush surface (as bits of confetti at rest on the ground), or to invade the interior of the brush in which case the platelets stand end-on and in some cases protrude above the outer edge of the brush. The orientation of the additives is controlled by the ratio of the diameter of the additive to the thickness of the bare brush, as well as the ratio of solvent-monomer and solvent-platelet interactions.
Robust adaptive high-order RANS methods
Kudo, Jun, S.M. Massachusetts Institute of Technology
2014-01-01T23:59:59.000Z
The ability to achieve accurate predictions of turbulent flow over arbitrarily complex geometries proves critical in the advancement of aerospace design. However, quantitatively accurate results from modern Computational ...
Chen, Shu-Hua
Effects of Moist Froude Number and CAPE on a Conditionally Unstable Flow over a Mesoscale Mountain- dimensional mountain ridge in order to investigate the propagation and types of cloud precipitation systems unstable flow passing over a two-dimensional mesoscale mountain ridge. The characteristics of these flow
Performance of Particle Flow Calorimetry at CLIC
J. S. Marshall; A. Münnich; M. A. Thomson
2012-09-18T23:59:59.000Z
The particle flow approach to calorimetry can provide unprecedented jet energy resolution at a future high energy collider, such as the International Linear Collider (ILC). However, the use of particle flow calorimetry at the proposed multi-TeV Compact Linear Collider (CLIC) poses a number of significant new challenges. At higher jet energies, detector occupancies increase, and it becomes increasingly difficult to resolve energy deposits from individual particles. The experimental conditions at CLIC are also significantly more challenging than those at previous electron-positron colliders, with increased levels of beam-induced backgrounds combined with a bunch spacing of only 0.5 ns. This paper describes the modifications made to the PandoraPFA particle flow algorithm to improve the jet energy reconstruction for jet energies above 250 GeV. It then introduces a combination of timing and p_T cuts that can be applied to reconstructed particles in order to significantly reduce the background. A systematic study is performed to understand the dependence of the jet energy resolution on the jet energy and angle, and the physics performance is assessed via a study of the energy and mass resolution of W and Z particles in the presence of background at CLIC. Finally, the missing transverse momentum resolution is presented, and the fake missing momentum is quantified. The results presented in this paper demonstrate that high granularity particle flow calorimetry leads to a robust and high resolution reconstruction of jet energies and di-jet masses at CLIC.
Coupling free flow / porous-medium flow General idea
Cirpka, Olaf Arie
equation t (v) + div (vv ) - div(v) + p - g - qv = 0 Darcy flow equation t (S) - div K (p - g) - qpmT transport equation t (X) + div (vX - DsteamX) = qsteam 16/14 #12;Backup additional Darcy flow equations-Stokes 1 phase, 2 components, temperature sharp interface porous-medium / Darcy flow 2 phases, 2 component
Nematic ordering of topological defects in active liquid crystals
Oza, Anand U
2015-01-01T23:59:59.000Z
Identifying the ordering principles of intracellular matter is key to understanding the physics of microbiological systems. Recent experiments show that ATP-driven microtubule-kinesin bundles can form non-equilibrium networks of liquid-crystalline order when trapped in an oil-water interface near a solid boundary. At high densities, the bundles realize a 2D active nematic phase characterized by spontaneous creation and annihilation of topological defects, reminiscent of particle-pair production processes in quantum systems. This remarkable discovery sparked considerable theoretical interest, yet a satisfactory mathematical description has remained elusive, primarily for the following two reasons. First, prevailing multi-component theories feature a large number of unknown parameters that make quantitative comparison with experiment infeasible. Second, the currently favored hydrodynamic models assume divergence-free 2D interfacial flow, thereby promoting turbulent pattern formation through upward cascades. Suc...
Boundary Degeneracy of Topological Order
Juven Wang; Xiao-Gang Wen
2015-01-15T23:59:59.000Z
We introduce the concept of boundary degeneracy of topologically ordered states on a compact orientable spatial manifold with boundaries, and emphasize that the boundary degeneracy provides richer information than the bulk degeneracy. Beyond the bulk-edge correspondence, we find the ground state degeneracy of the fully gapped edge modes depends on boundary gapping conditions. By associating different types of boundary gapping conditions as different ways of particle or quasiparticle condensations on the boundary, we develop an analytic theory of gapped boundaries. By Chern-Simons theory, this allows us to derive the ground state degeneracy formula in terms of boundary gapping conditions, which encodes more than the fusion algebra of fractionalized quasiparticles. We apply our theory to Kitaev's toric code and Levin-Wen string-net models. We predict that the $Z_2$ toric code and $Z_2$ double-semion model (more generally, the $Z_k$ gauge theory and the $U(1)_k \\times U(1)_{-k}$ non-chiral fractional quantum Hall state at even integer $k$) can be numerically and experimentally distinguished, by measuring their boundary degeneracy on an annulus or a cylinder.
VanOsdol, John G.
2013-06-25T23:59:59.000Z
The disclosure provides a pulse jet mixing vessel for mixing a plurality of solid particles. The pulse jet mixing vessel is comprised of a sludge basin, a flow surface surrounding the sludge basin, and a downcoming flow annulus between the flow surface and an inner shroud. The pulse jet mixing vessel is additionally comprised of an upper vessel pressurization volume in fluid communication with the downcoming flow annulus, and an inner shroud surge volume separated from the downcoming flow annulus by the inner shroud. When the solid particles are resting on the sludge basin and a fluid such as water is atop the particles and extending into the downcoming flow annulus and the inner shroud surge volume, mixing occurs by pressurization of the upper vessel pressurization volume, generating an inward radial flow over the flow surface and an upwash jet at the center of the sludge basin.
Flow (2008) Director: Irena Salina
Hemmers, Oliver
2008-01-01T23:59:59.000Z
Flow (2008) Director: Irena Salina Run Time: 93 min. Summary: ,Irena Salina's documentary film://documentaryfilms.suite101.com/article.cfm/desperate_for_water_irena_salinas_movie_flow No Dumb Questions (2001) Director
HYDROLYZED WOOD SLURRY FLOW MODELING
Wrathall, Jim
2012-01-01T23:59:59.000Z
LBL-10090 UC-61 HYDROLYZED WOOD SLURRY FLOW MODELING JimLBL-10090 HYDROLYZED WOOD SLURRY FLOW MODELING Jim Wrathallconversion of hydrolyzed wood slurry to fuel oil, Based on
Message Flow Modulator Final Report
Boyer, Robert Stephen
operational environment at the Patuxent River Naval Air Test Center with scenarios developed by an independent in testing and demonstrating the flow modulator at the Patuxent River Naval Air Test Center. #12;MESSAGE FLOW
Robert Carroll
2007-11-05T23:59:59.000Z
We show some relations between Ricci flow and quantum theory via Fisher information and the quantum potential.
Experimental and theoretical studies of isothermal upward gas-liquid flows in vertical tubes
Fernandes, R.C.
1981-01-01T23:59:59.000Z
In two-phase flow technolgy, two important problems exist which must be solved as a function of the various physical and system parameters associated with the phenomenon, and which stand as prerequisites for proper modelling of two-phase processes: Prediction of the flow pattern under existing operating conditions and prediction of the holdup for each given flow pattern. Modelling studies of steady isothermal upward gas-liquid flows in vertical pipes, at low pressures, were undertaken. Experimental data on liquid holdup over a wide range of flow rates were taken for all observed flow patterns-bubbly, slug, churn, and annular - by means of a specially designed Quick-Closing Valves System. This technique also allowed the detection of a unique phenomenon occurring in the form of fast-flowing slugs of gas-liquid mixture, in both the churn and annular flow patterns, which was called the lump phenomenon. The lump holdup was measured and a qualitative theory regarding the nature, formation and propagation of these structures was proposed. A photographic method was applied to the slug flow pattern in order to determine both the rise velocity and length of Taylor bubbles and liquid slugs characteristic of this flow regime. Assisted by the measured data, flow pattern-based physical models were developed for predicting holdup of bubbly flows and the detailed structure of slug flows. The latter was accomplished by means of a fairly complete analysis which enabled the prediction of several variables of interest such as void fractions, velocities, film thicknesses and the length ratio between Taylor bubbles and liquid slugs. The average holdup for churn flow was predicted by directly applying the slug flow model to that flow pattern. A simplified framework for calculating the holdup in annular flows was also proposed. The comparison between theory and experiment showed that for bubbly, slug and churn flows the predicted results are in good agreement with the data.
Progress in Grid Scale Flow Batteries
2011Year #12;Flow Battery Research at PNNL and Sandia #12 with industries and universities New Generation Redox Flow Batteries, PNNL Developed new generation redox flow
FLOW CONDITIONING DESIGN IN TURBULENT
near the nozzle exit influenced by different flow conditioner (vs. nozzle) designs? How are velocity in the flow conditioner? Will more screens reduce free-surface fluctuations? #12;4 Objectives · Quantify effect of flow conditioner designs in terms of mean velocity and turbulence intensity just upstream
Microgravity Flow Regime Transition Modeling
Shephard, Adam M.
2010-07-14T23:59:59.000Z
Flow regime transitions and the modeling thereof underlie the design of microgravity two-phase systems. Through the use of the zero-g laboratory, microgravity two-phase flows can be studied. Because microgravity two-phase flows exhibit essentially...
Dunn, J.C.; Hardee, H.C.; Striker, R.P.
1984-01-09T23:59:59.000Z
A convective heat flow probe device is provided which measures heat flow and fluid flow magnitude in the formation surrounding a borehole. The probe comprises an elongate housing adapted to be lowered down into the borehole; a plurality of heaters extending along the probe for heating the formation surrounding the borehole; a plurality of temperature sensors arranged around the periphery of the probe for measuring the temperature of the surrounding formation after heating thereof by the heater elements. The temperature sensors and heater elements are mounted in a plurality of separate heater pads which are supported by the housing and which are adapted to be radially expanded into firm engagement with the walls of the borehole. The heat supplied by the heater elements and the temperatures measured by the temperature sensors are monitored and used in providing the desired measurements. The outer peripheral surfaces of the heater pads are configured as segments of a cylinder and form a full cylinder when taken together. A plurality of temperature sensors are located on each pad so as to extend along the length and across the width thereof, with a heating element being located in each pad beneath the temperature sensors. An expansion mechanism driven by a clamping motor provides expansion and retraction of the heater pads and expandable packet-type seals are provided along the probe above and below the heater pads.
Tatsuya Higuchi; Akimaro Kawahara; Michio Sadatomi; Hiroyuki Kudo [Kumamoto University, 39-1, Kurokami 2-chome, Kumamoto 860-8555 (Japan)
2006-07-01T23:59:59.000Z
Single- and two-phase diversion cross-flows arising from the pressure difference between tight lattice subchannels are our concern in this study. In order to obtain a correlation of the diversion cross-flow, we conducted adiabatic experiments using a vertical multiple-channel with two subchannels simplifying the triangle tight lattice rod bundle for air-water flows at room temperature and atmospheric pressure. In the experiments, data were obtained on the axial variations in the pressure difference between the subchannels, the ratio of flow rate in one subchannel to the whole channel, the void fraction in each subchannel for slug-churn and annular flows in two-phase flow case. These data were analyzed by use of a lateral momentum equation based on a two-fluid model to determine both the cross-flow resistance coefficient between liquid phase and channel wall and the gas-liquid interfacial friction coefficient. The resulting coefficients have been correlated in a way similar to that developed for square lattice subchannel case by Kano et al. (2002); the cross-flow resistance coefficient data can be well correlated with a ratio of the lateral velocity due to the cross-flow to the axial one irrespective of single- and two-phase flows; the interfacial friction coefficient data were well correlated with a Reynolds number, which is based on the relative velocity between gas and liquid cross-flows as the characteristic velocity. (authors)
California energy flow in 1992
Borg, I.Y.; Briggs, C.K.
1994-04-01T23:59:59.000Z
For the past 16 years energy flow diagrams for the State of California have been prepared from available data by members of the Lawrence Livermore National Laboratory. They have proven to be useful tools in graphically expressing energy supply and use in the State as well as illustrating the difference between particular years and between the State and the US as a whole. As far as is possible, similar data sources have been used to prepare the diagrams from year to year and identical assumptions{sup la-le} concerning conversion efficiencies have been made in order to minimize inconsistencies in the data and analyses. Sources of data used in this report are given in Appendix B and C; unavoidably the sources used over the 1976--1993 period have varied as some data bases are no longer available. In addition, we continue to see differences in specific data reported by different agencies for a given year. In particular, reported data on supply and usage in industrial/commercial/residential end-use categories have shown variability amongst the data gathering agencies, which bars detailed comparisons from year to year. Nonetheless, taken overall, valid generalizations can be made concerning gross trends and changes.
Nematic ordering of topological defects in active liquid crystals
Anand U. Oza; Jörn Dunkel
2015-07-15T23:59:59.000Z
Identifying the ordering principles of intracellular matter is key to understanding the physics of microbiological systems. Recent experiments show that ATP-driven microtubule-kinesin bundles can form non-equilibrium networks of liquid-crystalline order when trapped in an oil-water interface near a solid boundary. At high densities, the bundles realize a 2D active nematic phase characterized by spontaneous creation and annihilation of topological defects, reminiscent of particle-pair production processes in quantum systems. This remarkable discovery sparked considerable theoretical interest, yet a satisfactory mathematical description has remained elusive, primarily for the following two reasons. First, prevailing multi-component theories feature a large number of unknown parameters that make quantitative comparison with experiment infeasible. Second, the currently favored hydrodynamic models assume divergence-free 2D interfacial flow, thereby promoting turbulent pattern formation through upward cascades. Such cascades are unlikely to occur in experiments, where interface and bulk fluid can continuously exchange matter. Here, we propose a compact alternative continuum theory for dense active liquid crystals by merging ideas from the Landau-de Gennes and Swift-Hohenberg theories. The resulting fourth-order model agrees quantitatively with experimental data, correctly predicts a regime of long-range nematic alignment of defects, and manifests an analogy with a generalized Gross-Pitaevskii quantum theory. Generally, our results suggest that universal ordering principles may govern a wide range of active materials.
Overland flow hydrograph synthesis by digital computer
Wei, Tsong C.
1966-01-01T23:59:59.000Z
and dx dx (for i'orward characteristics) or dv v(x - IIx t) - v x t) hx 5x (for backward characteristics) for the numerical analysis, where v(x, t) is the flow velocity at point (x, t) of the x, t-plane and II is the increment. t+ gt t - dt x- Qx... a stable solution. Schreiber used the implicit method. The advantage of the implicit method is that the solution is always stable regardless of' the ratio of bx and dt. But in order to solve the numerical equations using the implicit method...
Microphase transitions of block copolymer/homopolymer under shear flow
Y. Guo; J. Zhang; B. Wang; H. Wu; M. Sun; J. Pan
2015-06-26T23:59:59.000Z
Cell dynamics simulation is used to investigate the phase behavior of block copolymer/homopolymer mixture subjected to a steady shear flow. Phase transitions occur from transverse to parallel and then to perpendicular lamellar structure with an increase of shear rate and this is the result of interaction between the shear flow and the concentration fluctuation. Rheological properties, such as normal stress differences and shear viscosity, are all closely related with the direction of the lamellae. Furthermore, we specifically explore the phase behavior and the order parameter under weak and strong shear of two different initial states, and realize the importance of the thermal history. It is necessary to apply the shear field at the appropriate time if we want to get what we want. These results provide an easy method to create ordered, defect-free materials in experiment and engineering technology through imposing shear flow.
Equivalent roughness height for plane bed under oscillatory flow
Paris-Sud XI, Université de
, the bed roughness height of a flat and fixed bed is given in terms of the Nikuradse roughness height (ks may be several orders of magnitude larger than for a fixed bed. This is probably causedEquivalent roughness height for plane bed under oscillatory flow Beno^it Camenen , Magnus Larson
Equivalent Roughness Height for Plane Bed under Steady Flow
US Army Corps of Engineers
current conditions. In general, owing to dimensional reasons, the bed roughness height of a flat and fixed orders of magnitude larger than for a fixed bed. This is probably caused by the increased energyEquivalent Roughness Height for Plane Bed under Steady Flow Benoît Camenen, Ph.D.1 ; Atilla Bayram
Power flow analysis for amplifier design and energy harvesting
Lindner, Douglas K.
. In order to improve the efficiency of an active isolation system we analyze different feedback control energy on a active vibration isolation system it is important to understand the influence of the existingPower flow analysis for amplifier design and energy harvesting Nikola Vujica, Donald J. Leoa
Microgravity flow pattern identification using void fraction signals
Valota, Luca
2005-08-29T23:59:59.000Z
, there is need for a better, objective flow regime identification. The void fraction is a key parameter in monitoring the operating state of a two-phase system and several tools have been developed in order to measure it. The purpose of this study is to use...
Microsoft Word - Wind Industry Work Order Information Flow Survey__WithSNLMarkings_Final.docx
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41clothThe Bonneville PowerTariff Pages default SignEnergy4 3. EFFECTIVE DATE (M/D/Y) See9,4/201341,C I T u thGWave PA In
An order flow model and a liquidity measure of financial markets
Kim, Adlar Jeewook
2008-01-01T23:59:59.000Z
The thesis seeks a better understanding of liquidity generation process of financial markets and attempts to find a quantitative measure of market liquidity. Various statistical modeling techniques are introduced to model ...
Pauls, Mark
2014-03-18T23:59:59.000Z
-step versions of the authorized use scenario water availability models using existing and recently added features of the Water Rights Analysis Package (WRAP). Various metrics are developed by this research to characterize the degree to which the environmental...
Large-scale experimental investigation of flow characteristics in labyrinth seal geometries
Younger, James Stanton
1994-01-01T23:59:59.000Z
order to determine the flow characteristics and leakage resistance properties of advanced labyrinth seals. A unique water test facility is used to acquire leakage resistance measurements for two-dimensional, planar models of multi-cavity, stepped...
Nguyen, Ngoc Thanh
2011-02-22T23:59:59.000Z
current single-phase systems due to reductions in system size, weight and power consumption. The mechanisms of pressure drop, heat transfer coefficients, void fractions, and flow regimes must be well understood under microgravity conditions in order...
Weak-strong clustering transition in renewing compressible flows
Dhanagare, Ajinkya; Vincenzi, Dario
2014-01-01T23:59:59.000Z
We investigate the statistical properties of Lagrangian tracers transported by a time-correlated compressible renewing flow. We show that the preferential sampling of the phase space performed by tracers yields significant differences between the Lagrangian statistics and its Eulerian counterpart. In particular, the effective compressibility experienced by tracers has a non-trivial dependence on the time correlation of the flow. We examine the consequence of this phenomenon on the clustering of tracers, focusing on the transition from the weak- to the strong-clustering regime. We find that the critical compressibility at which the transition occurs is minimum when the time correlation of the flow is of the order of the typical eddy turnover time. Further, we demonstrate that the clustering properties in time-correlated compressible flows are non-universal and are strongly influenced by the spatio-temporal structure of the velocity field.
Weak-strong clustering transition in renewing compressible flows
Ajinkya Dhanagare; Stefano Musacchio; Dario Vincenzi
2014-11-01T23:59:59.000Z
We investigate the statistical properties of Lagrangian tracers transported by a time-correlated compressible renewing flow. We show that the preferential sampling of the phase space performed by tracers yields significant differences between the Lagrangian statistics and its Eulerian counterpart. In particular, the effective compressibility experienced by tracers has a non-trivial dependence on the time correlation of the flow. We examine the consequence of this phenomenon on the clustering of tracers, focusing on the transition from the weak- to the strong-clustering regime. We find that the critical compressibility at which the transition occurs is minimum when the time correlation of the flow is of the order of the typical eddy turnover time. Further, we demonstrate that the clustering properties in time-correlated compressible flows are non-universal and are strongly influenced by the spatio-temporal structure of the velocity field.
Numerical simulation of air/water multiphase flows for ceramic sanitary ware design by multiple GPUs
8 Numerical simulation of air/water multiphase flows for ceramic sanitary ware design by multiple and manufacturing of plumbing products such as ceramic sanitary wares. In order to re-produce the complex/water multiphase flows for ceramic sanitary ware design by multiple GPUs Being a world-wide leading company, TOTO
Utrecht, Universiteit
is currently the norm in order to ensure that the calculated mean paleointensity does not differ significantly from the true flow mean. Furthermore, they indicate that a low measured dispersion for a small number flows to avoid biasing of the mean. INDEX TERMS: 1533 Geomagnetism and Paleomagnetism: Remagnetization
Apte, Sourabh V.
and dispersion of particles due to fluctuations in the fluid flow is important to develop reduced-ordered models and engineering involve two-phase flows where solid particles of arbitrary shape and sizes are dispersed sediment transport in rivers, fluidized beds, coal-based oxy-fuel combustion chambers, biomass gasifiers
Flow Imaging Using MRI: Quantification and Analysis
Jiraraksopakun, Yuttapong
2010-07-14T23:59:59.000Z
A complex and challenging problem in flow study is to obtain quantitative flow information in opaque systems, for example, blood flow in biological systems and flow channels in chemical reactors. In this regard, MRI is superior to the conventional...
A stabilized stochastic finite element second-order projection method for modeling
Zabaras, Nicholas J.
of freedom. Because of the porosity dependence of the pressure gradient term in the governing flow equations-order projection method is presented based on a pressure gradient projection. A two- dimensional stochastic problem occurring in var- ious applications such as fluidized beds, solidification of alloys, geothermal energy
A mechanical picture of fractional-order Darcy equation Luca Deseri a,b,c,d
Deseri, Luca
A mechanical picture of fractional-order Darcy equation Luca Deseri a,b,c,d , Massimiliano Zingales: Anomalous diffusion Porous media Darcy equation Fractional derivatives Anomalous scaling a b s t r a c of the particle flow. The transport equation, formally analogous to the Fick relation is the so-called Darcy
Broader source: Energy.gov (indexed) [DOE]
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362Transmission: CommentsVirginia. DOCUMENTSDEA has deployed aMeetingsAWhileY-12 NationalComplex Flow
Higher order integral stark-type conjectures
Emmons, Caleb J.
2006-01-01T23:59:59.000Z
D . Popescu. Rubin's integral refinement of the abelianS A N DIEGO Higher Order Integral Stark-Type Conjectures ADISSERTATION Higher Order Integral Stark-Type Conjectures by
Spiral Laminar Flow: A revolution in understanding?
Greenaway, Alan
Blood Flow Spiral laminar flow #12;Spiral flow in the Aorta (MRI) Computational Fluid Dynamics 0 10 20Spiral Laminar Flow: A revolution in understanding? Reintroduction of natural blood flow Laminar Flow through Runoff (3months) Proximal Anastomosis SLF TM Graft Distal Anastomosis Post-op Angios
Tunable fractional-order Fourier transformer
Malyutin, A A [A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
2006-01-31T23:59:59.000Z
A fractional two-dimensional Fourier transformer whose orders are tuned by means of optical quadrupoles is described. It is shown that in the optical scheme considered, the Fourier-transform order a element of [0,1] in one of the mutually orthogonal planes corresponds to the transform order (2-a) in another plane, i.e., to inversion and inverse Fourier transform of the order a. (laser modes and beams)
President Truman Orders Development of Thermonuclear Weapon ...
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Orders Development of Thermonuclear Weapon | National Nuclear Security Administration Facebook Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing...
Second order noncommutative corrections to gravity
Calmet, Xavier [Universite Libre de Bruxelles, Service de Physique Theorique, CP225 Boulevard du Triomphe (Campus plaine), B-1050 Brussels (Belgium); Kobakhidze, Archil [Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 (United States)
2006-08-15T23:59:59.000Z
In this work, we calculate the leading order corrections to general relativity formulated on a canonical noncommutative spacetime. These corrections appear in the second order of the expansion in theta. First order corrections can only appear in the gravity-matter interactions. Some implications are briefly discussed.
TIGHT BOUNDS ON EXPECTED ORDER STATISTICS
Bertsimas, Dimitris
TIGHT BOUNDS ON EXPECTED ORDER STATISTICS DIIIMMMIIITTTRRRIIISSS BEEERRRTTTSSSIIIMMMAAASSS Sloan@nus.edu.sg In this article, we study the problem of finding tight bounds on the expected value of the kth-order statistic E of the highest-order statistic E @Xn:n# can be computed with a bisection search algo- rithm+ An extremal discrete
McKay, M.D.; Sweeney, C.E.; Spangler, B.S. Jr.
1993-11-30T23:59:59.000Z
A flow meter and temperature measuring device are described comprising a tube with a body centered therein for restricting flow and a sleeve at the upper end of the tube to carry several channels formed longitudinally in the sleeve to the appropriate axial location where they penetrate the tube to allow pressure measurements and temperature measurements with thermocouples. The high pressure measurement is made using a channel penetrating the tube away from the body and the low pressure measurement is made at a location at the widest part of the body. An end plug seals the end of the device and holes at its upper end allow fluid to pass from the interior of the tube into a plenum. The channels are made by cutting grooves in the sleeve, the grooves widened at the surface of the sleeve and then a strip of sleeve material is welded to the grooves closing the channels. Preferably the sleeve is packed with powdered graphite before cutting the grooves and welding the strips. 7 figures.
McKay, Mark D. (1426 Socastee Dr., North Augusta, SC 29841); Sweeney, Chad E. (3600 Westhampton Dr., Martinez, GA 30907-3036); Spangler, Jr., B. Samuel (2715 Margate Dr., Augusta, GA 30909)
1993-01-01T23:59:59.000Z
A flow meter and temperature measuring device comprising a tube with a body centered therein for restricting flow and a sleeve at the upper end of the tube to carry several channels formed longitudinally in the sleeve to the appropriate axial location where they penetrate the tube to allow pressure measurements and temperature measurements with thermocouples. The high pressure measurement is made using a channel penetrating the tube away from the body and the low pressure measurement is made at a location at the widest part of the body. An end plug seals the end of the device and holes at its upper end allow fluid to pass from the interior of the tube into a plenum. The channels are made by cutting grooves in the sleeve, the grooves widened at the surface of the sleeve and then a strip of sleeve material is welded to the grooves closing the channels. Preferably the sleeve is packed with powdered graphite before cutting the grooves and welding the strips.
Valenzuela, Javier (Hanover, NH)
2001-01-01T23:59:59.000Z
A radial flow heat exchanger (20) having a plurality of first passages (24) for transporting a first fluid (25) and a plurality of second passages (26) for transporting a second fluid (27). The first and second passages are arranged in stacked, alternating relationship, are separated from one another by relatively thin plates (30) and (32), and surround a central axis (22). The thickness of the first and second passages are selected so that the first and second fluids, respectively, are transported with laminar flow through the passages. To enhance thermal energy transfer between first and second passages, the latter are arranged so each first passage is in thermal communication with an associated second passage along substantially its entire length, and vice versa with respect to the second passages. The heat exchangers may be stacked to achieve a modular heat exchange assembly (300). Certain heat exchangers in the assembly may be designed slightly differently than other heat exchangers to address changes in fluid properties during transport through the heat exchanger, so as to enhance overall thermal effectiveness of the assembly.
Representations of the groups of order 24
Strange, John Billy
1967-01-01T23:59:59.000Z
: MATHEMATICS REPRESENTATIONS OF THE GROUPS OF ORDER 24 A Thesis By JOHN BILLY STRANGE Approved as to style and content by: I tl ~Chairman of Commrtteeg YMe ber C o QH d I D p ~t'Dt May l967 ACKNOWLEDGMENT During the past eighteen months it has been... cyclic group of order i. 1 The remaining groups with symbols are listed below. 10. 12 (Dihedral of order 24) 11. 12. Q] 2 13. (4, 2 l 2, 2) (Symmetric of order 24) (Quaternion of order 24) 14. &-2, 2, 3& 15. &2, 3, 3& 10 A recent discovery by D...
Active combustion flow modulation valve
Hensel, John Peter; Black, Nathaniel; Thorton, Jimmy Dean; Vipperman, Jeffrey Stuart; Lambeth, David N; Clark, William W
2013-09-24T23:59:59.000Z
A flow modulation valve has a slidably translating hollow armature with at least one energizable coil wound around and fixably attached to the hollow armature. The energizable coil or coils are influenced by at least one permanent magnet surrounding the hollow armature and supported by an outer casing. Lorentz forces on the energizable coils which are translated to the hollow armature, increase or decrease the flow area to provide flow throttling action. The extent of hollow armature translation depends on the value of current supplied and the direction of translation depends on the direction of current flow. The compact nature of the flow modulation valve combined with the high forces afforded by the actuator design provide a flow modulation valve which is highly responsive to high-rate input control signals.
Subsurface Flow and Transport | EMSL
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
subsurface related to contaminant transport, carbon cycling, enhanced oil recovery and carbon dioxide sequestration. See a complete list of Subsurface Flow and Transport...
Torczynski, John R. (Albuquerque, NM)
2001-02-27T23:59:59.000Z
A module bay requires less cleanroom airflow. A shaped gas inlet passage can allow cleanroom air into the module bay with flow velocity preferentially directed toward contaminant rich portions of a processing module in the module bay. Preferential gas flow direction can more efficiently purge contaminants from appropriate portions of the module bay, allowing a reduced cleanroom air flow rate for contaminant removal. A shelf extending from an air inlet slit in one wall of a module bay can direct air flowing therethrough toward contaminant-rich portions of the module bay, such as a junction between a lid and base of a processing module.
Non--Atomic Components of Data Flow Diagrams: Stores, Persistent Flows,
Symanzik, Jürgen
Non--Atomic Components of Data Flow Diagrams: Stores, Persistent Flows, and Tests for Empty Flows J NON--ATOMIC COMPONENTS OF DATA FLOW DIAGRAMS: STORES, PERSISTENT FLOWS, AND TESTS FOR EMPTY FLOWS of these common features of traditional Data Flow Diagrams elevates the expressive power of FDFD's, or whether
L. Ma; G. L. Ma; Y. G. Ma
2014-04-23T23:59:59.000Z
Anisotropic flow coefficients and their fluctuations are investigated for Au+Au collisions at center of mass energy $\\sqrt{s_{NN}}$ = 200 GeV by using a multi-phase transport model with string melting scenario. Experimental results of azimuthal anisotropies by means of the two- and four-particle cumulants are generally well reproduced by the model including both parton cascade and hadronic rescatterings. Event-by-event treatments of the harmonic flow coefficients $v_n$ (for n = 2, 3 and 4) are performed, in which event distributions of $v_n$ for different orders are consistent with Gaussian shapes over all centrality bins. Systematic studies on centrality, transverse momentum ($p_{T}$) and pseudo-rapidity ($\\eta$) dependencies of anisotropic flows and quantitative estimations of the flow fluctuations are presented. The $p_{T}$ and $\\eta$ dependencies of absolute fluctuations for both $v_2$ and $v_3$ follow similar trends as their flow coefficients. Relative fluctuation of triangular flow $v_3$ is slightly centrality-dependent, which is quite different from that of elliptic flow $v_2$. It is observed that parton cascade has a large effect on the flow fluctuations, but hadronic scatterings make little contribution to the flow fluctuations, which indicates flow fluctuations are mainly modified during partonic evolution stage.
3-D laser Doppler velocimetry study of incompressible flow through an orifice plate
Panak, David Leo
1990-01-01T23:59:59.000Z
on the velocity field, turbulent kinetic energies, and Reynolds stresses. The main characteristic of orifice flow is the separated flow regime and associated recirculation zones. As far as detailed flow field measurements are concerned (e. g. the ReynoMs stress... in accordance with orifice metering standards given in the American Gas Association's (AGA) rifi e Me rin f N [22]. Slight alterations were made on the orifice meter facility in order for the 3-D LDV system to make velocity measurements in the flow field...
Rényi entropy flows from quantum heat engines
Mohammad H. Ansari; Yuli V. Nazarov
2015-03-20T23:59:59.000Z
We evaluate Renyi entropy flows from generic quantum heat engines (QHE) to a weakly-coupled probe environment kept in thermal equilibrium. We show that the flows are determined not only by heat flow but also by a quantum coherent flow that can be separately measured in experiment apart from the heat flow measurement. The same pertains to Shanon entropy flow. This appeals for a revision of the concept of entropy flows in quantum nonequlibrium thermodynamics.
Efficiency of initiating cell adhesion in hydrodynamic flow
C. Korn; U. S. Schwarz
2006-09-05T23:59:59.000Z
We theoretically investigate the efficiency of initial binding between a receptor-coated sphere and a ligand-coated wall in linear shear flow. The mean first passage time for binding decreases monotonically with increasing shear rate. Above a saturation threshold of the order of a few 100 receptor patches, the binding efficiency is enhanced only weakly by increasing their number and size, but strongly by increasing their height. This explains why white blood cells in the blood flow adhere through receptor patches localized to the tips of microvilli, and why malaria-infected red blood cells form elevated receptor patches (knobs).
Liquid chromatography/Fourier transform IR spectrometry interface flow cell
Johnson, Charles C. (Fairfield, OH); Taylor, Larry T. (Blacksburg, VA)
1986-01-01T23:59:59.000Z
A zero dead volume (ZDV) microbore high performance liquid chromatography (.mu.HPLC)/Fourier transform infrared (FTIR) interface flow cell includes an IR transparent crystal having a small diameter bore therein through which a sample liquid is passed. The interface flow cell further includes a metal holder in combination with a pair of inner, compressible seals for directly coupling the thus configured spectrometric flow cell to the outlet of a .mu.HPLC column end fitting to minimize the transfer volume of the effluents exiting the .mu.HPLC column which exhibit excellent flow characteristics due to the essentially unencumbered, open-flow design. The IR beam passes transverse to the sample flow through the circular bore within the IR transparent crystal, which is preferably comprised of potassium bromide (KBr) or calcium fluoride (CaF.sub.2), so as to minimize interference patterns and vignetting encountered in conventional parallel-plate IR cells. The long IR beam pathlength and lensing effect of the circular cross-section of the sample volume in combination with the refractive index differences between the solvent and the transparent crystal serve to focus the IR beam in enhancing sample detection sensitivity by an order of magnitude.
Liquid chromatography/Fourier transform IR spectrometry interface flow cell
Johnson, C.C.; Taylor, L.T.
1985-01-04T23:59:59.000Z
A zero dead volume (ZDV) microbore high performance liquid chromatography (..mu.. HPLC)/Fourier transform infrared (FTIR) interface flow cell includes an IR transparent crystal having a small diameter bore therein through which a sample liquid is passed. The interface flow cell further includes a metal holder in combination with a pair of inner, compressible seals for directly coupling the thus configured spectrometric flow cell to the outlet of a ..mu.. HPLC column end fitting to minimize the transfer volume of the effluents exiting the ..mu.. HPLC column which exhibit excellent flow characteristics due to the essentially unencumbered, open-flow design. The IR beam passes transverse to the sample flow through the circular bore within the IR transparent crystal, which is preferably comprised of potassium bromide (KBr) or calcium fluoride (CaF/sub 2/), so as to minimize interference patterns and vignetting encountered in conventional parallel-plate IR cells. The long IR beam pathlength and lensing effect of the circular cross-section of the sample volume in combination with the refractive index differences between the solvent and the transparent crystal serve to focus the IR beam in enhancing sample detection sensitivity by an order of magnitude.
A preliminary study to Assess Model Uncertainties in Fluid Flows
Marc Oliver Delchini; Jean C. Ragusa
2009-09-01T23:59:59.000Z
The goal of this study is to assess the impact of various flow models for a simplified primary coolant loop of a light water nuclear reactor. The various fluid flow models are based on the Euler equations with an additional friction term, gravity term, momentum source, and energy source. The geometric model is purposefully chosen simple and consists of a one-dimensional (1D) loop system in order to focus the study on the validity of various fluid flow approximations. The 1D loop system is represented by a rectangle; the fluid is heated up along one of the vertical legs and cooled down along the opposite leg. A pressurizer and a pump are included in the horizontal legs. The amount of energy transferred and removed from the system is equal in absolute value along the two vertical legs. The various fluid flow approximations are compressible vs. incompressible, and complete momentum equation vs. Darcy’s approximation. The ultimate goal is to compute the fluid flow models’ uncertainties and, if possible, to generate validity ranges for these models when applied to reactor analysis. We also limit this study to single phase flows with low-Mach numbers. As a result, sound waves carry a very small amount of energy in this particular case. A standard finite volume method is used for the spatial discretization of the system.
Marketing Milk Under Federal Orders in Texas.
Stelly, Randall
1960-01-01T23:59:59.000Z
.8 billion pounds of milk, which was more than 72 percent of the whole milk delivered to plants and dealers by Texas dairy farmers. Federal orders define the terms under which dairymen sell their milk to handlers. The pur- pose of the orders... and the dependability of its production. Orderly marketing is sought by defining in advance the terms for both buyers and sellers. These terms are developed largely through public hearings where producers, handlers and consum- ers have an opportunity to participate...
Redox Flow Batteries, a Review
U. Tennessee Knoxville; U. Texas Austin; McGill U; Weber, Adam Z.; Mench, Matthew M.; Meyers, Jeremy P.; Ross, Philip N.; Gostick, Jeffrey T.; Liu, Qinghua
2011-07-15T23:59:59.000Z
Redox flow batteries are enjoying a renaissance due to their ability to store large amounts of electrical energy relatively cheaply and efficiently. In this review, we examine the components of redox flow batteries with a focus on understanding the underlying physical processes. The various transport and kinetic phenomena are discussed along with the most common redox couples.
Network Flow Optimization under Uncertainty
Tesfatsion, Leigh
, production, generation, transportation, trade, storage injections and withdrawals of coal, gas?) xij is flow along arc (i, j), from node i to node j cij is cost per unit of flow along (i, j Network model in words Minimize the cost of satisfying demands for electric energy By: imports, exports
Engineered Solutions: Order (2010-CE-2112)
Broader source: Energy.gov [DOE]
DOE issued an Order after entering into a Compromise Agreement with Engineered Solutions, Inc. to resolve a case involving the failure to certify dehumidifier basic model SD109.
ESPC Task Order Face Page Template
Broader source: Energy.gov [DOE]
Document provides a face page template for a U.S. Department of Energy task order as part of an energy savings performance contract (ESPC).
Resonant radiation from oscillating higher order solitons
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Driben, R.; Yulin, A. V.; Efimov, A.
2015-07-15T23:59:59.000Z
We present radiation mechanism exhibited by a higher order soliton. In a course of its evolution the higher-order soliton emits polychromatic radiation resulting in formation of multipeak frequency comb-like spectral band. The shape and spectral position of this band can be effectively controlled by the relative strength of the third order dispersion. An analytical description is corroborated by numerical simulations. Research showed that for longer pulses the described effect persists also under the action of higher order perturbations such as Raman and self-steepening.
Generalized Reduced Order Modeling of Aeroservoelastic Systems
Gariffo, James Michael
2013-01-01T23:59:59.000Z
Aeroelasticity, Dover, 1996. [7] Dowell, E. , Crawley, E. ,Engineering, 2010. [13] Dowell, E. , “Some Recent AdvancesFL, 2010. [14] Attar, P. and Dowell, E. , “A Reduced Order
Optical method of atomic ordering estimation
Prutskij, T. [Instituto de Ciencias, BUAP, Privada 17 Norte, No 3417, col. San Miguel Huyeotlipan, Puebla, Pue. (Mexico); Attolini, G. [IMEM/CNR, Parco Area delle Scienze 37/A - 43010, Parma (Italy); Lantratov, V.; Kalyuzhnyy, N. [Ioffe Physico-Technical Institute, 26 Polytekhnicheskaya, St Petersburg 194021, Russian Federation (Russian Federation)
2013-12-04T23:59:59.000Z
It is well known that within metal-organic vapor-phase epitaxy (MOVPE) grown semiconductor III-V ternary alloys atomically ordered regions are spontaneously formed during the epitaxial growth. This ordering leads to bandgap reduction and to valence bands splitting, and therefore to anisotropy of the photoluminescence (PL) emission polarization. The same phenomenon occurs within quaternary semiconductor alloys. While the ordering in ternary alloys is widely studied, for quaternaries there have been only a few detailed experimental studies of it, probably because of the absence of appropriate methods of its detection. Here we propose an optical method to reveal atomic ordering within quaternary alloys by measuring the PL emission polarization.
Adaptive LES Methodology for Turbulent Flow Simulations
Oleg V. Vasilyev
2008-06-12T23:59:59.000Z
Although turbulent flows are common in the world around us, a solution to the fundamental equations that govern turbulence still eludes the scientific community. Turbulence has often been called one of the last unsolved problem in classical physics, yet it is clear that the need to accurately predict the effect of turbulent flows impacts virtually every field of science and engineering. As an example, a critical step in making modern computational tools useful in designing aircraft is to be able to accurately predict the lift, drag, and other aerodynamic characteristics in numerical simulations in a reasonable amount of time. Simulations that take months to years to complete are much less useful to the design cycle. Much work has been done toward this goal (Lee-Rausch et al. 2003, Jameson 2003) and as cost effective accurate tools for simulating turbulent flows evolve, we will all benefit from new scientific and engineering breakthroughs. The problem of simulating high Reynolds number (Re) turbulent flows of engineering and scientific interest would have been solved with the advent of Direct Numerical Simulation (DNS) techniques if unlimited computing power, memory, and time could be applied to each particular problem. Yet, given the current and near future computational resources that exist and a reasonable limit on the amount of time an engineer or scientist can wait for a result, the DNS technique will not be useful for more than 'unit' problems for the foreseeable future (Moin & Kim 1997, Jimenez & Moin 1991). The high computational cost for the DNS of three dimensional turbulent flows results from the fact that they have eddies of significant energy in a range of scales from the characteristic length scale of the flow all the way down to the Kolmogorov length scale. The actual cost of doing a three dimensional DNS scales as Re{sup 9/4} due to the large disparity in scales that need to be fully resolved. State-of-the-art DNS calculations of isotropic turbulence have recently been completed at the Japanese Earth Simulator (Yokokawa et al. 2002, Kaneda et al. 2003) using a resolution of 40963 (approximately 10{sup 11}) grid points with a Taylor-scale Reynolds number of 1217 (Re {approx} 10{sup 6}). Impressive as these calculations are, performed on one of the world's fastest super computers, more brute computational power would be needed to simulate the flow over the fuselage of a commercial aircraft at cruising speed. Such a calculation would require on the order of 10{sup 16} grid points and would have a Reynolds number in the range of 108. Such a calculation would take several thousand years to simulate one minute of flight time on today's fastest super computers (Moin & Kim 1997). Even using state-of-the-art zonal approaches, which allow DNS calculations that resolve the necessary range of scales within predefined 'zones' in the flow domain, this calculation would take far too long for the result to be of engineering interest when it is finally obtained. Since computing power, memory, and time are all scarce resources, the problem of simulating turbulent flows has become one of how to abstract or simplify the complexity of the physics represented in the full Navier-Stokes (NS) equations in such a way that the 'important' physics of the problem is captured at a lower cost. To do this, a portion of the modes of the turbulent flow field needs to be approximated by a low order model that is cheaper than the full NS calculation. This model can then be used along with a numerical simulation of the 'important' modes of the problem that cannot be well represented by the model. The decision of what part of the physics to model and what kind of model to use has to be based on what physical properties are considered 'important' for the problem. It should be noted that 'nothing is free', so any use of a low order model will by definition lose some information about the original flow.
Vertical flow chemical detection portal
Linker, Kevin L. (Albuquerque, NM); Hannum, David W. (Albuquerque, NM); Conrad, Frank James (Russellville, SC)
1999-01-01T23:59:59.000Z
A portal apparatus for screening objects or persons for the presence of trace amounts of chemical substances such as illicit drugs or explosives. The apparatus has a test space, in which a person may stand, defined by two generally upright sides spanned by a horizontal transom. One or more fans in the transom generate a downward air flow (uni-directional) within the test space. The air flows downwardly from a high pressure upper zone, past the object or person to be screened. Air moving past the object dislodges from the surface thereof both volatile and nonvolatile particles of the target substance. The particles are entrained into the air flow which continues flowing downward to a lower zone of reduced pressure, where the particle-bearing air stream is directed out of the test space and toward preconcentrator and detection components. The sides of the portal are specially configured to partially contain and maintain the air flow.
Vertical flow chemical detection portal
Linker, K.L.; Hannum, D.W.; Conrad, F.J.
1999-06-22T23:59:59.000Z
A portal apparatus is described for screening objects or persons for the presence of trace amounts of chemical substances such as illicit drugs or explosives. The apparatus has a test space, in which a person may stand, defined by two generally upright sides spanned by a horizontal transom. One or more fans in the transom generate a downward air flow (uni-directional) within the test space. The air flows downwardly from a high pressure upper zone, past the object or person to be screened. Air moving past the object dislodges from the surface thereof both volatile and nonvolatile particles of the target substance. The particles are entrained into the air flow which continues flowing downward to a lower zone of reduced pressure, where the particle-bearing air stream is directed out of the test space and toward preconcentrator and detection components. The sides of the portal are specially configured to partially contain and maintain the air flow. 3 figs.
Orders Granting Natural Gas, LNG & CNG Authorizations Issued...
Orders Granting Natural Gas, LNG & CNG Authorizations Issued in 2014 Orders Granting Natural Gas, LNG & CNG Authorizations Issued in 2014 Order 3378 - Encana Natural Gas Inc. Order...
Wavy flow cooling concept for turbine airfoils
Liang, George (Palm City, FL)
2010-08-31T23:59:59.000Z
An airfoil including an outer wall and a cooling cavity formed therein. The cooling cavity includes a leading edge flow channel located adjacent a leading edge of the airfoil and a trailing edge flow channel located adjacent a trailing edge of the airfoil. Each of the leading edge and trailing edge flow channels define respective first and second flow axes located between pressure and suction sides of the airfoil. A plurality of rib members are located within each of the flow channels, spaced along the flow axes, and alternately extending from opposing sides of the flow channels to define undulating flow paths through the flow channels.
Briggs, C.K.; Borg, I.Y.
1985-07-01T23:59:59.000Z
The 1984 energy flow diagram for the USA has been constructed using Department of Energy data. It is a convenient graphical device to show supply and demand as well as the size of end-use sectors. A 4% increase in overall energy consumption represented a reversal in a downward trend started in 1979. All indicators pointed to more healthy industrial and farm economies in 1984 than in the previous two years, which accounted for some part of the increase in energy use. While domestic crude oil production remained stable, oil imports rose eight percent also reversing a long-standing trend. Seventy-two million barrels of oil primarily from Mexico and the United Kingdom were added to the Strategic Petroleum Reserve bringing the total oil stored at year end to 451 million barrels. At the same time 49 million barrels of oil were produced from the government-owned Naval Petroleum Reserve No. 1 (Elk Hills, CA). Energy use in all end-use sectors grew in 1984 which is in keeping with increases in use of all types of fossil fuels as well as electricity. Increase in electrical power demand continued to exceed forecasts, and during 1984 contracts for imports to the northeast US were negotiated with Canada. Nuclear power contributed 15% of total power generated in the US. At year end there were 86 licensed reactors and 44 in either start-up or construction stages. Six were canceled or abandoned during construction during the year. 11 refs., 4 figs., 3 tabs.
Flow Rate Measurements Using Flow-Induced Pipe Vibration
R. P. Evans; Jonathan D. Blotter; Alan G. Stephens
2004-03-01T23:59:59.000Z
This paper focuses on the possibility of a non-intrusive, low cost, flow rate measurement technique. The technique is based on signal noise from an accelerometer attached to the surface of the pipe. The signal noise is defined as the standard deviation of the frequency averaged time series signal. Experimental results are presented that indicate a nearly quadratic relationship between the signal noise and mass flow rate in the pipe. It is also shown that the signal noise - flow rate relationship is dependant on the pipe material and diameter.
AIAA 99--1467 LOW ORDER AERODYNAMIC
Peraire, Jaime
. The technique is ap plicable to viscous and threedimensional problems as well as multistage problems the stable operating range, potentially leading to better compressor performance. In addition, understanding. with permission. Various possible flow control methods for extending the stable operating range of compressors
Construction of Higher Order Finite Element with
Kern, Michel
' & $ % Construction of Higher Order Finite Element with Mass Lumping Using Computer Algebra. (3D, combinatorial analysis, new third order element) 2 #12; ' & $ % Guidelines for the construction of nodes must be ~ P k unisolvent. 2. Finite element must be continuous. 3. Quadrature formula must satisfy
Program Termination and Well Partial Orderings
Blass, Andreas R.
Program Termination and Well Partial Orderings Andreas Blass Yuri Gurevich Abstract The following observation may be useful in establishing program termination: if a transitive relation R is covered of the stature P of a well partial ordering P and show that |R| 1 × · · · × n and that this bound is tight
Order, chaos and nuclear dynamics: An introduction
Swiatecki, W.J.
1990-08-01T23:59:59.000Z
This is an introductory lecture illustrating by simple examples the anticipated effect on collective nuclear dynamics of a transition from order to chaos in the motions of nucleons inside an idealized nucleus. The destruction of order is paralleled by a transition from a rubber-like to a honey-like behaviour of the independent-particle nuclear model. 10 refs., 6 figs.
Entomology 201 Identification of Insecta orders
Eubanks, Micky
Bedbugs (Hemiptera): -head tucked back in pronotum -antennae w/ 4-5 long (moniliform) segments #12;Order Hemiptera True bugs, cicadas & hoppers, aphids & scale bugs Piercing-sucking mouthparts! #12;· Unique) Order Hemiptera True bugs, cicadas & hoppers, aphids & scale bugs #12;Know the Suborders
Texas Union Pizza Order Form ROOM RESERVED ______________________________________________________
Jefferys, William
: ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ ________________________________________________________________________________________________ Pick-up All orders are to be picked up at the Texas Union Hospitality Center desk in the south end West#12;#12;Texas Union Pizza Order Form ROOM RESERVED with the Texas Union Policies and Procedures. I understand that I will be held responsible for any debts incurred
Order Effects in Incremental Learning 1. Introduction
Langley, Pat
of incremental learning and introducing some distinctions among types of order effects. We then turn to a moreOrder Effects in Incremental Learning 1. Introduction Intelligent agents, including humans, exist in an environment that changes over time. Thus, it seems natural that models of learning in such agents take
Mutiscale Modeling of Segregation in Granular Flows
Jin Sun
2007-08-03T23:59:59.000Z
Modeling and simulation of segregation phenomena in granular flows are investigated. Computational models at different scales ranging from particle level (microscale) to continuum level (macroscale) are employed in order to determine the important microscale physics relevant to macroscale modeling. The capability of a multi-fluid model to capture segregation caused by density difference is demonstrated by simulating grain-chaff biomass flows in a laboratory-scale air column and in a combine harvester. The multi-fluid model treats gas and solid phases as interpenetrating continua in an Eulerian frame. This model is further improved by incorporating particle rotation using kinetic theory for rapid granular flow of slightly frictional spheres. A simplified model is implemented without changing the current kinetic theory framework by introducing an effective coefficient of restitution to account for additional energy dissipation due to frictional collisions. The accuracy of predicting segregation rate in a gas-fluidized bed is improved by the implementation. This result indicates that particle rotation is important microscopic physics to be incorporated into the hydrodynamic model. Segregation of a large particle in a dense granular bed of small particles under vertical. vibration is studied using molecular dynamics simulations. Wall friction is identified as a necessary condition for the segregation. Large-scale force networks bearing larger-than-average forces are found with the presence of wall friction. The role of force networks in assisting rising of the large particle is analyzed. Single-point force distribution and two-point spatial force correlation are computed. The results show the heterogeneity of forces and a short-range correlation. The short correlation length implies that even dense granular flows may admit local constitutive relations. A modified minimum spanning tree (MST) algorithm is developed to asymptotically recover the force statistics in the force networks. This algorithm provides a possible route to constructing a continuum model with microstructural information supplied from it. Microstructures in gas fluidized beds are also analyzed using a hybrid method, which couples the discrete element method (DEM) for particle dynamics with the averaged two-fluid (TF) equations for the gas phase. Multi-particle contacts are found in defluidized regions away from bubbles in fluidized beds. The multi-particle contacts invalidate the binary-collision assumption made in the kinetic theory of granular flows for the defluidized regions. Large ratios of contact forces to drag forces are found in the same regions, which confirms the relative importance of contact forces in determining particle dynamics in the defluidized regions.
Odd orders in Shor's factoring algorithm
Thomas Lawson
2015-01-13T23:59:59.000Z
Shor's factoring algorithm (SFA) finds the prime factors of a number, $N=p_1 p_2$, exponentially faster than the best known classical algorithm. Responsible for the speed-up is a subroutine called the quantum order finding algorithm (QOFA) which calculates the order -- the smallest integer, $r$, satisfying $a^r \\mod N =1$, where $a$ is a randomly chosen integer coprime to $N$ (meaning their greatest common divisor is one, $\\gcd(a, N) =1$). Given $r$, and with probability not less than $1/2$, the factors are given by $p_1 = \\gcd (a^{\\frac{r}{2}} - 1, N)$ and $p_2 = \\gcd (a^{\\frac{r}{2}} + 1, N)$. For odd $r$ it is assumed the factors cannot be found (since $a^{\\frac{r}{2}}$ is not generally integer) and the QOFA is relaunched with a different value of $a$. But a recent paper [E. Martin-Lopez: Nat Photon {\\bf 6}, 773 (2012)] noted that the factors can sometimes be found from odd orders if the coprime is square. This raises the question of improving SFA's success probability by considering odd orders. We show that an improvement is possible, though it is small. We present two techniques for retrieving the order from apparently useless runs of the QOFA: not discarding odd orders; and looking out for new order finding relations in the case of failure. In terms of efficiency, using our techniques is equivalent to avoiding square coprimes and disregarding odd orders, which is simpler in practice. Even still, our techniques may be useful in the near future, while demonstrations are restricted to factoring small numbers. The most convincing demonstrations of the QOFA are those that return a non-power-of-two order, making odd orders that lead to the factors attractive to experimentalists.
Turbine blade tip flow discouragers
Bunker, Ronald Scott (Niskayuna, NY)
2000-01-01T23:59:59.000Z
A turbine assembly comprises a plurality of rotating blade portions in a spaced relation with a stationery shroud. The rotating blade portions comprise a root section, a tip portion and an airfoil. The tip portion has a pressure side wall and a suction side wall. A number of flow discouragers are disposed on the blade tip portion. In one embodiment, the flow discouragers extend circumferentially from the pressure side wall to the suction side wall so as to be aligned generally parallel to the direction of rotation. In an alternative embodiment, the flow discouragers extend circumferentially from the pressure side wall to the suction side wall so as to be aligned at an angle in the range between about 0.degree. to about 60.degree. with respect to a reference axis aligned generally parallel to the direction of rotation. The flow discouragers increase the flow resistance and thus reduce the flow of hot gas flow leakage for a given pressure differential across the blade tip portion so as to improve overall turbine efficiency.
Mobile monolithic polymer elements for flow control in microfluidic devices
Hasselbrink, Jr., Ernest F. (Saline, MI); Rehm, Jason E. (Alameda, CA); Shepodd, Timothy J. (Livermore, CA); Kirby, Brian J. (San Francisco, CA)
2005-11-11T23:59:59.000Z
A cast-in-place and lithographically shaped mobile, monolithic polymer element for fluid flow control in microfluidic devices and method of manufacture. Microfluid flow control devices, or microvalves that provide for control of fluid or ionic current flow can be made incorporating a cast-in-place, mobile monolithic polymer element, disposed within a microchannel, and driven by fluid pressure (either liquid or gas) against a retaining or sealing surface. The polymer elements are made by the application of lithographic methods to monomer mixtures formulated in such a way that the polymer will not bond to microchannel walls. The polymer elements can seal against pressures greater than 5000 psi, and have a response time on the order of milliseconds. By the use of energetic radiation it is possible to depolymerize selected regions of the polymer element to form shapes that cannot be produced by conventional lithographic patterning and would be impossible to machine.
Mobile monolithic polymer elements for flow control in microfluidic devices
Hasselbrink, Jr., Ernest F.; Rehm, Jason E.; Shepodd, Timothy J.
2004-08-31T23:59:59.000Z
A cast-in-place and lithographically shaped mobile, monolithic polymer element for fluid flow control in microfluidic devices and method of manufacture. Microfluid flow control devices, or microvalves that provide for control of fluid or ionic current flow can be made incorporating a cast-in-place, mobile monolithic polymer element, disposed within a microchannel, and driven by either fluid or gas pressure against a retaining or sealing surface. The polymer elements are made by the application of lithographic methods to monomer mixtures formulated in such a way that the polymer will not bond to microchannel walls. The polymer elements can seal against pressures greater than 5000 psi, and have a response time on the order of milliseconds. By the use of energetic radiation it is possible to depolymerize selected regions of the polymer element to form shapes that cannot be produced by conventional lithographic patterning and would be impossible to machine.
Ballooning instabilities in tokamaks with sheared toroidal flows
Waelbroeck, F.L.; Chen, L.
1990-11-01T23:59:59.000Z
The stability of ballooning modes in the presence of sheared toroidal flows is investigated. The eigenmodes are shown to be related by a Fourier transformation to the non-exponentially growing Floquet solutions found by Cooper. It is further shown that the problem cannot be reduced further than to a two dimensional partial differential equation. Next, the generalized ballooning equation is solved analytically for a circular tokamak equilibrium with sonic flows, but with a small rotation shear compared to the sound speed. With this ordering, the centrifugal forces are comparable to the pressure gradient forces driving the instability, but coupling of the mode with the sound wave is avoided. A new stability criterion is derived which explicitly demonstrates that flow shear is stabilizing at constant centrifugal force gradient. 34 refs.
Mobile Monolith Polymer Elements For Flow Control In Microfluidic Systems
Hasselbrink, Jr., Ernest F. (Saline, MI); Rehm, Jason E. (Alameda, CA); Shepodd, Timothy J. (Livermore, CA); Kirby, Brian J. (San Francisco, CA)
2006-01-24T23:59:59.000Z
A cast-in-place and lithographically shaped mobile, monolithic polymer element for fluid flow control in microfluidic devices and method of manufacture. Microfluid flow control devices, or microvalves that provide for control of fluid or ionic current flow can be made incorporating a cast-in-place, mobile monolithic polymer element, disposed within a microchannel, and driven by fluid pressure (either liquid or gas) against a retaining or sealing surface. The polymer elements are made by the application of lithographic methods to monomer mixtures formulated in such a way that the polymer will not bond to microchannel walls. The polymer elements can seal against pressures greater than 5000 psi, and have a response time on the order of milliseconds. By the use of energetic radiation it is possible to depolymerize selected regions of the polymer element to form shapes that cannot be produced by conventional lithographic patterning and would be impossible to machine.
On O($a^2$) effects in gradient flow observables
Alberto Ramos; Stefan Sint
2015-04-18T23:59:59.000Z
In lattice gauge theories, the gradient flow has been used extensively both, for scale setting and for defining finite volume renormalization schemes for the gauge coupling. Unfortunately, rather large cutoff effects have been observed in some cases. We here investigate these effects to leading order in perturbation theory, considering various definitions of the lattice observable, the lattice flow equation and the Yang Mills lattice action. These considerations suggest an improved set- up for which we perform a scaling test in the pure SU(3) gauge theory, demonstrating strongly reduced cutoff effects. We then attempt to obtain a more complete understanding of the structure of O($a^2$) effects by applying Symanzik's effective theory approach to the 4+1 dimensional local field theory with flow time as the fifth dimension. From these considerations we are led to a fully O($a^2$) improved set-up the study of which is left to future work.
A viscous instability in axially symmetric laminar shear flows
Shakura, Nikolai
2015-01-01T23:59:59.000Z
A viscous instability in shearing laminar axisymmetric hydrodynamic flows around a gravitating center is described. In the linearized hydrodynamic equations written in the Boussinesq approximation with microscopic molecular transport coefficients, the instability arises when the viscous dissipation is taken into account in the energy equation. Using the local WKB approximation, we derive a third-order algebraic dispersion equation with two modes representing the modified Rayleigh modes R+ and R-, and the third X-mode. We show that in thin accretion flows the viscosity destabilizes one of the Rayleigh modes in a wide range of wavenumbers, while the X-mode always remains stable. In Keplerian flows, the instability increment is found to be a few Keplerian rotational periods at wavelengths with $kr\\sim 10-50$. This instability may cause turbulence in astrophysical accretion discs even in the absence of magnetic field.
Two-dimensional AMR simulations of colliding flows
Niklaus, Markus; Niemeyer, Jens C
2009-01-01T23:59:59.000Z
Colliding flows are a commonly used scenario for the formation of molecular clouds in numerical simulations. Due to the thermal instability of the warm neutral medium, turbulence is produced by cooling. We carry out a two-dimensional numerical study of such colliding flows in order to test whether statistical properties inferred from adaptive mesh refinement (AMR) simulations are robust with respect to the applied refinement criteria. We compare probability density functions of various quantities as well as the clump statistics and fractal dimension of the density fields in AMR simulations to a static-grid simulation. The static grid with 2048^2 cells matches the resolution of the most refined subgrids in the AMR simulations. The density statistics is reproduced fairly well by AMR. Refinement criteria based on the cooling time or the turbulence intensity appear to be superior to the standard technique of refinement by overdensity. Nevertheless, substantial differences in the flow structure become apparent. In...
Flow distribution channels to control flow in process channels
Tonkovich, Anna Lee; Arora, Ravi; Kilanowski, David
2014-10-28T23:59:59.000Z
The invention describes features that can be used to control flow to an array of microchannels. The invention also describes methods in which a process stream is distributed to plural microchannels.
Section 13: Flow control 1 Section 13: Flow control
Kohlenbach, Ulrich
Abstract 14:50 15:10: Sebastian Türk, Gerti Daschiel, Yosuke Hasegawa, Bettina Frohnapfel (TU Darmstadt:10: Gerti Daschiel, Tobias Baier, Jürgen Saal, Bettina Frohnapfel (TU Darmstadt): On the flow resistance
The transition from two phase bubble flow to slug flow
Radovcich, Nick A.
1962-01-01T23:59:59.000Z
The process of transition from bubble to slug flow in a vertical pipe has been studied analytically and experimentally. An equation is presented which gives the agglomeration time as a function of void fraction, channel ...
Insertable fluid flow passage bridgepiece and method
Jones, Daniel O. (Glenville, NV)
2000-01-01T23:59:59.000Z
A fluid flow passage bridgepiece for insertion into an open-face fluid flow channel of a fluid flow plate is provided. The bridgepiece provides a sealed passage from a columnar fluid flow manifold to the flow channel, thereby preventing undesirable leakage into and out of the columnar fluid flow manifold. When deployed in the various fluid flow plates that are used in a Proton Exchange Membrane (PEM) fuel cell, bridgepieces of this invention prevent mixing of reactant gases, leakage of coolant or humidification water, and occlusion of the fluid flow channel by gasket material. The invention also provides a fluid flow plate assembly including an insertable bridgepiece, a fluid flow plate adapted for use with an insertable bridgepiece, and a method of manufacturing a fluid flow plate with an insertable fluid flow passage bridgepiece.
Cash Flow Projection for Operating Loan Determination
Klinefelter, Danny A.; McCorkle, Dean
2009-02-04T23:59:59.000Z
A cash flow statement is simply a record of the dollars coming in and the dollars going out of a business. This publication briefly discusses cash flow and gives a cash flow projection for operating loan determination.
Two phase flow in capillary tubes
Suo, Mikio
1963-01-01T23:59:59.000Z
The flow of two phases, gas and liquid, has been studied in horizontal tubes of capillary diameter. The flow has been primarily studied in the regime where the gas flows as long bubbles separated from the wall of the tube ...
Thermocapillary Flow on Superhydrophobic Surfaces
Baier, Tobias; Hardt, Steffen
2010-01-01T23:59:59.000Z
A liquid in Cassie-Baxter state above a structured superhydrophobic surface is ideally suited for surface driven transport due to its large free surface fraction in close contact to a solid. We investigate thermal Marangoni flow over a superhydrophobic array of fins oriented parallel or perpendicular to an applied temperature gradient. In the Stokes limit we derive an analytical expression for the bulk flow velocity above the surface and compare it with numerical solutions of the Navier-Stokes equation. Even for moderate temperature gradients comparatively large flow velocities are induced, suggesting to utilize this principle for microfluidic pumping.
Research on stochastic power-flow study methods. Final report
Heydt, G. T. [ed.] [ed.
1981-01-01T23:59:59.000Z
A general algorithm to determine the effects of uncertainty in bus load and generation on the output of conventional power flow analysis is presented. The use of statistical moments is presented and developed as a means for representing the stochastic process. Statistical moments are used to describe the uncertainties, and facilitate the calculations of single and multivarlate probability density functions of input and output variables. The transformation of the uncertainty through the power flow equations is made by the expansion of the node equations in a multivariate Taylor series about an expected operating point. The series is truncated after the second order terms. Since the power flow equations are nonlinear, the expected values of output quantities is in general not the solution to the conventional load flow problem using expected values of input quantities. The second order transformation offers a correction vector and allows the consideration of larger uncertainties which have caused significant error in the current linear transformation algorithms. Voltage controlled busses are included with consideration of upper and lower limits. The finite reactive power available at generation sites, and fixed ranges of transformer tap movement may have a significant effect on voltage and line power flow statistics. A method is given which considers limitation constraints in the evaluation of all output quantities. The bus voltages, line power flows, transformer taps, and generator reactive power requirements are described by their statistical moments. Their values are expressed in terms of the probability that they are above or below specified limits, and their expected values given that they do fall outside the limits. Thus the algorithm supplies information about severity of overload as well as probability of occurrence. An example is given for an eleven bus system, evaluating each quantity separately. The results are compared with Monte Carlo simulation.
Unstable periodic orbits in a chaotic meandering jet flow
Uleysky, M Yu; Prants, S V; 10.1088/1751-8113/41/21/215102
2012-01-01T23:59:59.000Z
We study the origin and bifurcations of typical classes of unstable periodic orbits in a jet flow that was introduced before as a kinematic model of chaotic advection, transport and mixing of passive scalars in meandering oceanic and atmospheric currents. A method to detect and locate the unstable periodic orbits and classify them by the origin and bifurcations is developed. We consider in detail period-1 and period-4 orbits playing an important role in chaotic advection. We introduce five classes of period-4 orbits: western and eastern ballistic ones, whose origin is associated with ballistic resonances of the fourth order, rotational ones, associated with rotational resonances of the second and fourth orders, and rotational-ballistic ones associated with a rotational-ballistic resonance. It is a new kind of nonlinear resonances that may occur in chaotic flow with jets and/or circulation cells. Varying the perturbation amplitude, we track out the origin and bifurcations of the orbits for each class.
Unstable periodic orbits in a chaotic meandering jet flow
M. Yu. Uleysky; M. V. Budyansky; S. V. Prants
2007-12-25T23:59:59.000Z
We study the origin and bifurcations of typical classes of unstable periodic orbits in a jet flow that was introduced before as a kinematic model of chaotic advection, transport and mixing of passive scalars in meandering oceanic and atmospheric currents. A method to detect and locate the unstable periodic orbits and classify them by the origin and bifurcations is developed. We consider in detail period-1 and period-4 orbits playing an important role in chaotic advection. We introduce five classes of period-4 orbits: western and eastern ballistic ones, whose origin is associated with ballistic resonances of the fourth order, rotational ones, associated with rotational resonances of the second and fourth orders, and rotational-ballistic ones associated with a rotational-ballistic resonance. It is a new kind of nonlinear resonances that may occur in chaotic flow with jets and/or circulation cells. Varying the perturbation amplitude, we track out the origin and bifurcations of the orbits for each class.
Thermal Conductivity of Ordered Molecular Water
W Evans; J Fish; P Keblinski
2006-02-16T23:59:59.000Z
We use molecular dynamics simulation to investigate thermal transport characteristics of water with various degree of orientational and translational order induced by the application of an electric field. We observe that orientational ordering of the water dipole moments has a minor effect on the thermal conductivity. However, electric-field induced crystallization and associated translational order results in approximately a 3-fold increase of thermal conductivity with respect to the base water, i.e., to values comparable with those characterizing ice crystal structures.
'Tilting' the Universe with the Landscape Multiverse: The 'Dark' Flow
L. Mersini-Houghton; R. Holman
2008-10-30T23:59:59.000Z
The theory for the selection of the initial state of the universe from the landscape multiverse predicts superhorizon inhomogeneities induced by nonlocal entanglement of our Hubble volume with modes and domains beyond the horizon. Here we show these naturally give rise to a bulk flow with correlation length of order horizon size. The modification to the gravitational potential has a characteristic scale $L_{1} \\simeq 10^{3} H^{-1}$, and it originates from the preinflationary remnants of the landscape. The 'tilt' in the potential induces power to the lowest CMB multipoles, with the dominant contribution being the dipole and next, the quadrupole. The induced multipoles $l \\le 2$ are aligned with an axis normal to their alignment plane being oriented along the preferred frame determined by the dipole. The preferred direction is displayed by the velocity field of the bulk flow relative to the expansion frame of the universe. The parameters are tightly constrained thus the derived modifications lead to robust predictions for testing our theory. The 'dark' flow was recently discovered by Kashlinsky et al. to be about $700 km/s$ which seems in good agreement with our predictions for the induced dipole of order $3 \\mu K$. Placed in this context, the discovery of the bulk flow by Kashlinsky et al. becomes even more interesting as it may provide a probe of the preinflationary physics and a window onto the landscape multiverse.
Exploring multi-layer flow network of international trade based on flow distances
Shen, Bin; Zheng, Qiuhua
2015-01-01T23:59:59.000Z
Based on the approach of flow distances, the international trade flow system is studied from the perspective of multi-layer flow network. A model of multi-layer flow network is proposed for modelling and analyzing multiple types of flows in flow systems. Then, flow distances are introduced, and symmetric minimum flow distance is presented. Subsequently, we discuss the establishment of the multi-layer flow networks of international trade from two coupled viewpoints, i.e., the viewpoint of commodity flow and that of money flow. Thus, the multi-layer flow networks of international trade is explored. First, trading "trophic levels" are adopted to depict positions that economies occupied in the flow network. We find that the distributions of trading "trophic levels" have the similar clustering pattern for different types of commodity, and there are some regularities between money flow network and commodity flow network. Second, we find that active and competitive countries trade a wide spectrum of products, while ...
Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Nozzle Flow, Spray, Combustion, & Emission Modeling using KH-ACT Primary Breakup Model & Detailed Chemistry Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling using...
Acoustic concentration of particles in fluid flow
Ward, Michael D. (Los Alamos, NM); Kaduchak, Gregory (Los Alamos, NM)
2010-11-23T23:59:59.000Z
An apparatus for acoustic concentration of particles in a fluid flow includes a substantially acoustically transparent membrane and a vibration generator that define a fluid flow path therebetween. The fluid flow path is in fluid communication with a fluid source and a fluid outlet and the vibration generator is disposed adjacent the fluid flow path and is capable of producing an acoustic field in the fluid flow path. The acoustic field produces at least one pressure minima in the fluid flow path at a predetermined location within the fluid flow path and forces predetermined particles in the fluid flow path to the at least one pressure minima.
Colorado: Isothermal Battery Calorimeter Quantifies Heat Flow...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Colorado: Isothermal Battery Calorimeter Quantifies Heat Flow, Helps Make Safer, Longer-lasting Batteries Colorado: Isothermal Battery Calorimeter Quantifies Heat Flow, Helps Make...
Bubbles as tracers of heat input to cooling flows
J. Binney; F. Alouani Bibi; H. Omma
2007-01-31T23:59:59.000Z
We examine the distribution of injected energy in three-dimensional, adaptive-grid simulations of the heating of cooling flows. We show that less than 10 percent of the injected energy goes into bubbles. Consequently, the energy input from the nucleus is underestimated by a factor of order 6 when it is taken to be given by PVgamma/(gamma-1), where P and V are the pressure and volume of the bubble, and gamma the ratio of principal specific heats.
Transonic throat flow in radial or nearly radial supersonic nozzles
Carroll, Bruce Frederick
1984-01-01T23:59:59.000Z
(member) Jose Porteiro (Nember) 8 Alter ( In eri D artment Head) Nay 1984 ABSTRACT Transonic Throat Flow in Radial or Nearly Radial Supersonic Nozzles. (Nay 1984) Bruce Frederick Carroll, B. S. , Texas ASS University Chairman of Advisory... ANALYSIS A. Problem Formulation B. Solution Procedure C. Solution Checks 25 D. Parametric Study of Solution Behavior . 35 CHAPTER IV ~ CONCLUSIONS AND RECOMMENDATIONS 68 REFERENCES 71 APPENDIX A. ORDER OF' MAGNITUDE ASSUMPTIONS APPENDIX B. SOLUTION...
Longitudinal dispersion in vegetated flow
Murphy, Enda
2006-01-01T23:59:59.000Z
Vegetation is ubiquitous in rivers, estuaries and wetlands, strongly influencing both water conveyance and mass transport. The plant canopy affects both mean and turbulent flow structure, and thus both advection and ...
2007 Estimated International Energy Flows
Smith, C A; Belles, R D; Simon, A J
2011-03-10T23:59:59.000Z
An energy flow chart or 'atlas' for 136 countries has been constructed from data maintained by the International Energy Agency (IEA) and estimates of energy use patterns for the year 2007. Approximately 490 exajoules (460 quadrillion BTU) of primary energy are used in aggregate by these countries each year. While the basic structure of the energy system is consistent from country to country, patterns of resource use and consumption vary. Energy can be visualized as it flows from resources (i.e. coal, petroleum, natural gas) through transformations such as electricity generation to end uses (i.e. residential, commercial, industrial, transportation). These flow patterns are visualized in this atlas of 136 country-level energy flow charts.
Miniaturized flow injection analysis system
Folta, J.A.
1997-07-01T23:59:59.000Z
A chemical analysis technique known as flow injection analysis is described, wherein small quantities of chemical reagents and sample are intermixed and reacted within a capillary flow system and the reaction products are detected optically, electrochemically, or by other means. A highly miniaturized version of a flow injection analysis system has been fabricated utilizing microfabrication techniques common to the microelectronics industry. The microflow system uses flow capillaries formed by etching microchannels in a silicon or glass wafer followed by bonding to another wafer, commercially available microvalves bonded directly to the microflow channels, and an optical absorption detector cell formed near the capillary outlet, with light being both delivered and collected with fiber optics. The microflow system is designed mainly for analysis of liquids and currently measures 38{times}25{times}3 mm, but can be designed for gas analysis and be substantially smaller in construction. 9 figs.
Miniaturized flow injection analysis system
Folta, James A. (Livermore, CA)
1997-01-01T23:59:59.000Z
A chemical analysis technique known as flow injection analysis, wherein small quantities of chemical reagents and sample are intermixed and reacted within a capillary flow system and the reaction products are detected optically, electrochemically, or by other means. A highly miniaturized version of a flow injection analysis system has been fabricated utilizing microfabrication techniques common to the microelectronics industry. The microflow system uses flow capillaries formed by etching microchannels in a silicon or glass wafer followed by bonding to another wafer, commercially available microvalves bonded directly to the microflow channels, and an optical absorption detector cell formed near the capillary outlet, with light being both delivered and collected with fiber optics. The microflow system is designed mainly for analysis of liquids and currently measures 38.times.25.times.3 mm, but can be designed for gas analysis and be substantially smaller in construction.
Minimum Stream Flow Standards (Connecticut)
Broader source: Energy.gov [DOE]
These regulations apply to all dams and structures which impound or divert waters on rivers or their tributaries, with some exceptions. The regulations set standards for minimum flow (listed in the...
Multiscale modeling in granular flow
Rycroft, Christopher Harley
2007-01-01T23:59:59.000Z
Granular materials are common in everyday experience, but have long-resisted a complete theoretical description. Here, we consider the regime of slow, dense granular flow, for which there is no general model, representing ...
Karniadakis, G.E.; Orszag, S.A. (Princeton Univ., NJ (United States))
1993-03-01T23:59:59.000Z
Computational fluid dynamics and the numerical prediction of fluid flow in the understanding and modeling of turbulence is discussed with emphasis on the development of direct numerical simulation (DNS) of high-Reynolds number turbulent flows. Recent advances in computer systems and their use in turbulence simulation are reviewed and the need for parallel processing to achieve teraflop speeds necessary for DNS is discussed. Computer system architectures, nodes, and parallel computers currently in use are reviewed. Spectral, spectral-element, particle, and hybrid difference methods of solving incompressible- and compressible-flow problems are examined. Four applications of parallel computers to turbulent flow problems are presented and future developments in computer systems are discussed. 24 refs.
Message Flow Modulator Final Report
Boyer, Robert Stephen
operational environment at the Patuxent River Naval Air Test Center with scenarios developed by an independent in testing and demonstrating the flow modulator at the Patuxent River Naval Air Test Center. #12; MESSAGE
Mechanical design of flow batteries
Hopkins, Brandon J. (Brandon James)
2013-01-01T23:59:59.000Z
The purpose of this research is to investigate the design of low-cost, high-efficiency flow batteries. Researchers are searching for next-generation battery materials, and this thesis presents a systems analysis encompassing ...
Fluid Flow Modeling in Fractures
Sarkar, Sudipta
2004-01-01T23:59:59.000Z
In this paper we study fluid flow in fractures using numerical simulation and address the challenging issue of hydraulic property characterization in fractures. The methodology is based on Computational Fluid Dynamics, ...
Subcooled flow boiling of fluorocarbons
Murphy, Richard Walter
1971-01-01T23:59:59.000Z
A study was conducted of heat transfer and hydrodynamic behavior for subcooled flow boiling of Freon-113, one of a group of fluorocarbons suitable for use in cooling of high-power-density electronic components. Problems ...
Lee, Shan-Hu
loss can be expressed with the first order rate constant, k, in a9 fast flow reactor:10 [H2SO4]t= [H2SO as the nucleation reactor. Ball et al.21 (1999) used a fast flow reactor in their H2SO4-H2O BHN experiments generator, a fast-flow nucleation46 reactor, an atmospheric pressure chemical ionization mass spectrometer
Danby Products: Order (2012-CE-1415)
Broader source: Energy.gov [DOE]
DOE ordered Danby Products to pay a $9,900 civil penalty after finding Danby had failed to certify that certain models of refrigerators and freezers comply with the applicable energy conservation standard.
Refrigerator Manufacturers: Order (2013-CE-5341)
Broader source: Energy.gov [DOE]
DOE ordered Refrigerator Manufacturers, LLC to pay a $8,000 civil penalty after finding Refrigerator Manufacturers had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
International Refrigeration: Order (2012-CE-1510)
Broader source: Energy.gov [DOE]
DOE ordered International Refrigeration Products to pay an $8,000 civil penalty after finding International Refrigeration had failed to certify that certain room air conditioners comply with the applicable energy conservation standard.
Cospolich Refrigerator: Order (2013-CE-5314)
Broader source: Energy.gov [DOE]
DOE ordered Cospolich Refrigerator Co, Inc. to pay a $8,000 civil penalty after finding Cospolich Refrigerator had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Proof Transformations in Higher-Order Logic
Spirtes, Peter
is given and its partial correctness is proven. Strong termination of this al- gorithm remains a conjectureProof Transformations in Higher-Order Logic Frank Pfenning January 1987 Submitted in partial
USA Manufacturing: Order (2013-CE-5336)
Broader source: Energy.gov [DOE]
DOE ordered USA Manufacturing to pay a $8,000 civil penalty after finding USA Manufacturing had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Hisense USA: Order (2010-CE-1211)
Broader source: Energy.gov [DOE]
DOE issued an Order after entering into a Compromise Agreement with Hisense USA Corp. after finding Hisense USA had failed to certify that certain models of residential refrigerators, refrigerator-freezers, and freezers comply with the applicable energy conservation standards.
Euro Chef USA: Order (2014-CE-23004)
Broader source: Energy.gov [DOE]
DOE ordered Euro Chef USA Inc. to pay a $8,000 civil penalty after finding Euro Chef USA had failed to certify that certain models of cooking products comply with the applicable energy conservation standards.
American Valve: Order (2010-CW-1411)
Broader source: Energy.gov [DOE]
DOE ordered American Valve, Inc. to pay a $5,000 civil penalty after finding American Valve had failed to certify that certain showerhead models comply with the applicable water conservation standards.
Kold Pack: Order (2013-CE-5323)
Broader source: Energy.gov [DOE]
DOE ordered Kold Pack, Inc. to pay a $8,000 civil penalty after finding Kold Pack had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Artisan Manufacturing: Order (2010-CW-0712)
Broader source: Energy.gov [DOE]
DOE ordered Artisan Manufacturing Company, Inc., to pay a $5,000 civil penalty after finding Artisan Manufacturing had failed to certify that certain models of faucets comply with the applicable water conservation standard.
Midea Washing Appliance: Order (2011-CE-1903)
Broader source: Energy.gov [DOE]
DOE ordered Midea Washing Appliance Mfg. Co., Ltd. to pay a $6,000 civil penalty after finding Midea Washing Appliance had failed to certify that certain models of dishwashers comply with the applicable energy conservation standards.
AM Conservation: Order (2010-CW-1415)
Broader source: Energy.gov [DOE]
DOE ordered AM Conservation Group, Inc. to pay a $5,000 civil penalty after finding AM Conservation had failed to certify that certain models of showerheads comply with the applicable water conservation standards.
Heat Controller: Order (2011-CE-1507)
Broader source: Energy.gov [DOE]
DOE ordered Heat Controller, Inc. to pay a $6,000 civil penalty after finding Heat Controller had failed to certify that certain models of room air conditioners comply with the applicable energy conservation standards.
EFFICIENT FIRST-ORDER METHODS FOR LINEAR ...
2014-10-06T23:59:59.000Z
Sep 19, 2014 ... EFFICIENT FIRST-ORDER METHODS FOR LP AND SDP. 3. Theorem 2.2. Let val be any value satisfying val < (C, I) . If X? solves max ?min(X).
Cal Flame: Order (2015-CE-14015)
Broader source: Energy.gov [DOE]
DOE ordered Cal Flame to pay a $8,000 civil penalty after finding Cal Flame had failed to certify that refrigerator basic model BBQ09849P-H complies with the applicable energy conservation standards.
Capital Cooking: Order (2014-CE-23008)
Broader source: Energy.gov [DOE]
DOE ordered Capital Cooking Equipment, Inc. to pay a $8,000 civil penalty after finding Capital Cooking had failed to certify that certain models of cooking products comply with the applicable energy conservation standards.
Copyright: The Copyright (International Conventions) Order, 1957
Agnew, W.G.
1957-01-01T23:59:59.000Z
This Order applies the main provisions of the Copyright Act, 1956, for the benefit of the countries mentioned in the First Schedule. The countries mentioned in Part I of that Schedule are members of tbe Berne Copyright ...
Acme Kitchenettes: Order (2011-CE-1406)
Broader source: Energy.gov [DOE]
DOE ordered Acme Kitchenettes Corp. to pay a $6,000 civil penalty after finding Acme Kitchenettes had failed to certify that certain models of refrigerators comply with the applicable energy conservation standards.
Hayward Industries: Order (2010-CE-1110)
Broader source: Energy.gov [DOE]
DOE ordered Hayward Industries, Inc. to pay a $10,000 civil penalty after finding Hayward Industries had failed to certify that certain models of pool heaters comply with the applicable energy conservation standards.
Seismic Attribute Analysis Using Higher Order Statistics
Greenidge, Janelle Candice
2009-05-15T23:59:59.000Z
Seismic data processing depends on mathematical and statistical tools such as convolution, crosscorrelation and stack that employ second-order statistics (SOS). Seismic signals are non-Gaussian and therefore contain information beyond SOS. One...
Aero-Tech: Order (2010-CE-1012)
Broader source: Energy.gov [DOE]
DOE issued an Order and closed this case against Aero-Tech Light Bulb Co., without civil penalty, after DOE found that Aero-Tech manufactured and/or privately labeled incandescent reflector lamps, but did not violate DOE regulations.
A. METHOD OF PAYMENT: B. ORDERING
Palmeri, Thomas
A. METHOD OF PAYMENT: B. ORDERING: Unit Price Quantity Total Price $44 $15 Limit of 5 UPS UPS of projecting lessons included in the Kindergarten Manual (e.g., using an Elmo document camera with projector
A fourth order [Sigma] [Delta] bandpass modulator
Hsu, Stephanie C
2009-01-01T23:59:59.000Z
A fourth order bandpass [Sigma] [Delta] modulator is proposed to digitize signals from a MEMS gyroscope. The modulator samples the amplitude-modulated signal at eight times the carrier frequency and achieves an SNR of 82dB ...
Engineered Products: Order (2012-SE-5401)
Broader source: Energy.gov [DOE]
DOE ordered Engineered Products Company to pay a $480 civil penalty after finding EPCO had manufactured/privately labeled and distributed in commerce in the U.S. 19 units of basic model 15701, a metal halide lamp fixture.
Dade Engineering: Order (2013-CE-5316)
Broader source: Energy.gov [DOE]
DOE ordered Dade Engineering Corp. to pay a $8,000 civil penalty after finding Dade Engineering had failed to certify that certain models of walk-in cooler and freezer (WICF) components comply with the applicable energy conservation standards.
Order and chaos : articulating support, housing transformation
Boehm, William Hollister
1990-01-01T23:59:59.000Z
This thesis presents an exploration on the theme of order and chaos, as a formal and social phenomenon, particularly as it relates to housing. The work stems from an attraction to the messy vitality we find in certain ...
Royal Centurion: Order (2012-CE-3608)
Broader source: Energy.gov [DOE]
DOE ordered Royal Centurion, Inc., to pay a $8,000 civil penalty after finding Royal Centurion had failed to certify that certain models of dehumidifiers comply with the applicable energy conservation standards.
Lumiram Electric: Order (2010-CE-1014)
Broader source: Energy.gov [DOE]
DOE issued an Order and entered into a Compromise Agreement with Lumiram Electric Corporation after finding Lumiram Electric had failed to certify that certain models of incandescent reflector lamps comply with the applicable energy conservation standards.
Anthony International: Order (2013-CE-5357)
Broader source: Energy.gov [DOE]
DOE ordered Anthony International to pay a $8,000 civil penalty after finding Anthony International had failed to certify that any basic models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Stiebel Eltron: Order (2010-CE-1711)
Broader source: Energy.gov [DOE]
DOE ordered Stiebel Eltron, Inc. to pay a $5,000 civil penalty after finding Stiebel Eltron had failed to certify that certain models of water heaters comply with the applicable energy conservation standards.
Prizer-Painter: Order (2014-CE-23005)
Broader source: Energy.gov [DOE]
DOE ordered Prizer-Painter Stove Works, Inc. to pay a $8,000 civil penalty after finding Prizer-Painter had failed to certify that certain models of cooking products comply with the applicable energy conservation standards.
Elmira Stove Works: Order (2011-CE-1407)
Broader source: Energy.gov [DOE]
DOE ordered Elmira Stove Works to pay a $6,000 civil penalty after finding Elmira Stove Works had failed to certify that certain models of refrigerator-freezers comply with the applicable energy conservation standard.
GE Appliances: Order (2010-CE-2113)
Broader source: Energy.gov [DOE]
DOE issued an Order after entering into a Compromise Agreement with General Electric Appliances after finding GE Appliances had failed to certify that certain models of dehumidifiers comply with the applicable energy conservation standards.
Viking Range: Order (2014-CE-23014)
Broader source: Energy.gov [DOE]
DOE ordered Viking Range, LLC to pay a $8,000 civil penalty after finding Viking Range had failed to certify that certain models of cooking products comply with the applicable energy conservation standards.
American Range: Order (2014-CE-23006)
Broader source: Energy.gov [DOE]
DOE ordered American Range Corporation to pay a $8,000 civil penalty after finding American Range had failed to certify that certain models of cooking products comply with the applicable energy conservation standards.
Explosive Safety Manual, to a New Order
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2010-12-02T23:59:59.000Z
This memorandum provides justification for the conversion of Department of Energy (DOE) Manual (M) 440.1-1A, DOE Explosives Safety Manual, dated 1-9-06, into a new DOE Order.
An Economic Evaluation of the Hass Avocado Promotion Order’s First Five Years
Carman, Hoy; Li, Lan; Sexton, Richard J.
2009-01-01T23:59:59.000Z
An Economic Evaluation of the Hass Avocado Promotion Order’s19 ii An Economic Evaluation of the Hass Avocado Promotionand R.K. Craft. An Economic Evaluation of California Avocado
General Nth order integrals of the motion
S. Post; P. Winternitz
2015-02-11T23:59:59.000Z
The general form of an integral of motion that is a polynomial of order N in the momenta is presented for a Hamiltonian system in two-dimensional Euclidean space. The classical and the quantum cases are treated separately, emphasizing both the similarities and the differences between the two. The main application will be to study Nth order superintegrable systems that allow separation of variables in the Hamilton-Jacobi and Schr\\"odinger equations, respectively.
Unstructured spectral element methods of simulation of turbulent flows
Henderson, R.D. [California Inst. of Technology, Pasadena, CA (United States)] [California Inst. of Technology, Pasadena, CA (United States); Karniadakis, G.E. [Brown Univ., Providence, RI (United States)] [Brown Univ., Providence, RI (United States)
1995-12-01T23:59:59.000Z
In this paper we present a spectral element-Fourier algorithm for simulating incompressible turbulent flows in complex geometries using unstructured quadrilateral meshes. To this end, we compare two different interface formulations for extending the conforming spectral element method in order to allow for surgical mesh refinement and still retain spectral accuracy: the Zanolli iterative procedure and variational patching based on auxiliary {open_quotes}mortar{close_quotes} functions. We present an interpretation of the original mortar element method as a patching scheme and develop direct and iterative solution techniques that make the method efficient for simulations of turbulent flows. The properties of the new method are analyzed in detail by studying the eigenspectra of the advection and diffusion operators. We then present numerical results that illustrate the flexibility as well as the exponential convergence of the new algorithm for nonconforming discretizations. We conclude with simulation studies of the turbulent cylinder wake at Re = 1000 (external flow) and turbulent flow over riblets at Re = 3280 (internal flow). 36 refs., 29 figs., 7 tabs.
Electro-osmotic flow in coated nanocapillaries: a theoretical investigation
Umberto Marini Bettolo Marconi; Michele Monteferrante; Simone Melchionna
2015-07-16T23:59:59.000Z
Motivated by recent experiments, we present a theoretical investigation of how the electro-osmotic flow occurring in a capillary is modified when its charged surfaces are coated by charged polymers. The theoretical treatment is based on a three dimensional model consisting of a ternary fluid-mixture, representing the solvent and two species for the ions, confined between two parallel charged plates decorated by a fixed array of scatterers representing the polymer coating. The electro-osmotic flow, generated by a constant electric field applied in a direction parallel to the plates, is studied numerically by means of Lattice Boltzmann simulations. In order to gain further understanding we performed a simple theoretical analysis by extending the Stokes-Smoluchowski equation to take into account the porosity induced by the polymers in the region adjacent the walls. We discuss the nature of the velocity profiles by focusing on the competing effects of the polymer charges and the frictional forces they exert. We show evidence of the flow reduction and of the flow inversion phenomenon when the polymer charge is opposite to the surface charge. By using the density of polymers and the surface charge as control variables, we propose a phase diagram that discriminates the direct and the reversed flow regimes and determine its dependence on the ionic concentration.
Stochastic dynamics of active swimmers in linear flows
Mario Sandoval; Navaneeth K. M.; Ganesh Subramanian; Eric Lauga
2014-06-17T23:59:59.000Z
Most classical work on the hydrodynamics of low-Reynolds-number swimming addresses deterministic locomotion in quiescent environments. Thermal fluctuations in fluids are known to lead to a Brownian loss of the swimming direction. As most cells or synthetic swimmers are immersed in external flows, we consider theoretically in this paper the stochastic dynamics of a model active particle (a self-propelled sphere) in a steady general linear flow. The stochasticity arises both from translational diffusion in physical space, and from a combination of rotary diffusion and run-and-tumble dynamics in orientation space. We begin by deriving a general formulation for all components of the long-time mean square displacement tensor for a swimmer with a time-dependent swimming velocity and whose orientation decorrelates due to rotary diffusion alone. This general framework is applied to obtain the convectively enhanced mean-squared displacements of a steadily-swimming particle in three canonical linear flows (extension, simple shear, and solid-body rotation). We then show how to extend our results to the case where the swimmer orientation also decorrelates on account of run-and-tumble dynamics. Self-propulsion in general leads to the same long-time temporal scalings as for passive particles in linear flows but with increased coefficients. In the particular case of solid-body rotation, the effective long-time diffusion is the same as that in a quiescent fluid, and we clarify the lack of flow-dependence by briefly examining the dynamics in elliptic linear flows. By comparing the new active terms with those obtained for passive particles we see that swimming can lead to an enhancement of the mean-square displacements by orders of magnitude, and could be relevant for biological organisms or synthetic swimming devices in fluctuating environmental or biological flows.
Higher-Order, Space-Time Adaptive Finite Volume Methods: Algorithms, Analysis and Applications
Minion, Michael
2014-04-29T23:59:59.000Z
The four main goals outlined in the proposal for this project were: 1. Investigate the use of higher-order (in space and time) finite-volume methods for fluid flow problems. 2. Explore the embedding of iterative temporal methods within traditional block-structured AMR algorithms. 3. Develop parallel in time methods for ODEs and PDEs. 4. Work collaboratively with the Center for Computational Sciences and Engineering (CCSE) at Lawrence Berkeley National Lab towards incorporating new algorithms within existing DOE application codes.
ORIGINAL PAPER Redox flow batteries: a review
Mench, Matthew M.
ORIGINAL PAPER Redox flow batteries: a review Adam Z. Weber · Matthew M. Mench · Jeremy P. Meyers with the most common redox couples. Keywords Flow battery Á Redox Á Regenerative fuel cell Á Flow cell Á The Author(s) 2011. This article is published with open access at Springerlink.com Abstract Redox flow
Methods for Numerical Flow Simulation Rolf Rannacher
models of laminar hemodynamical flows. We discuss space and time dis- cretization with emphasis as flow control and model calibration. We concen- trate on laminar flows in which all relevant spatial-Stokes equations The continuum mechanical model of the flow of a viscous Newtonian fluid is the system
CE 576 Environmental Flows Spring 2012
Rehmann, Chris
.1. Conservation of mass 1.2. Conservation of momentum 2. Channel flows 2.1. Laminar flow 2.1.1. Flow in a tubeCE 576 Environmental Flows Spring 2012 Course information Instructor: Prof. Chris Rehmann rehmann in environmental fluid mechanics Prerequisites: Elementary fluid mechanics, calculus, differential equations
Filiform Lie algebras of order 3
Navarro, R. M., E-mail: rnavarro@unex.es [Rosa María Navarro. Dpto. de Matemáticas, Universidad de Extremadura, Cáceres (Spain)
2014-04-15T23:59:59.000Z
The aim of this work is to generalize a very important type of Lie algebras and superalgebras, i.e., filiform Lie (super)algebras, into the theory of Lie algebras of order F. Thus, the concept of filiform Lie algebras of order F is obtained. In particular, for F = 3 it has been proved that by using infinitesimal deformations of the associated model elementary Lie algebra it can be obtained families of filiform elementary lie algebras of order 3, analogously as that occurs into the theory of Lie algebras [M. Vergne, “Cohomologie des algèbres de Lie nilpotentes. Application à l’étude de la variété des algèbres de Lie nilpotentes,” Bull. Soc. Math. France 98, 81–116 (1970)]. Also we give the dimension, using an adaptation of the sl(2,C)-module Method, and a basis of such infinitesimal deformations in some generic cases.
Conformal higher-order viscoelastic fluid mechanics
Masafumi Fukuma; Yuho Sakatani
2012-05-28T23:59:59.000Z
We present a generally covariant formulation of conformal higher-order viscoelastic fluid mechanics with strain allowed to take arbitrarily large values. We give a general prescription to determine the dynamics of a relativistic viscoelastic fluid in a way consistent with the hypothesis of local thermodynamic equilibrium and the second law of thermodynamics. We then elaborately study the transient time scales at which the strain almost relaxes and becomes proportional to the gradients of velocity. We particularly show that a conformal second-order fluid with all possible parameters in the constitutive equations can be obtained without breaking the hypothesis of local thermodynamic equilibrium, if the conformal fluid is defined as the long time limit of a conformal second-order viscoelastic system. We also discuss how local thermodynamic equilibrium could be understood in the context of the fluid/gravity correspondence.
ESPC Task Order Schedules and Placement of Pricing Information...
Office of Environmental Management (EM)
Task Order Schedules and Placement of Pricing Information ESPC Task Order Schedules and Placement of Pricing Information Document provides task order (TO) schedule descriptions and...
Resource convertibility and ordered commutative monoids
Tobias Fritz
2015-07-02T23:59:59.000Z
Resources and their use and consumption form a central part of our life. Many branches of science and engineering are concerned with the question of which given resource objects can be converted into which target resource objects. For example, information theory studies the conversion of a noisy communication channel instance into an exchange of information. Inspired by work in quantum information theory, we develop a general mathematical toolbox for this type of question. The convertibility of resources into other ones and the possibility of combining resources is accurately captured by the mathematics of ordered commutative monoids. As an intuitive example, we consider chemistry, where chemical reaction equations such as \\[ \\mathrm{2H_2 + O_2} \\to \\mathrm{2H_2O} \\] are concerned both with a convertibility relation "$\\to$" and a combination operation "$+$". We study ordered commutative monoids from an algebraic and functional-analytic perspective and derive a wealth of results which should have applications to concrete resource theories, such as a formula for rates of conversion. As a running example showing that ordered commutative monoids are also of purely mathematical interest, we exemplify our results with the ordered commutative monoid of graphs. While closely related to both Girard's linear logic and to Deutsch's constructor theory, our framework also produces results very reminiscent of the utility theorem of von Neumann and Morgenstern in decision theory and of a theorem of Lieb and Yngvason on thermodynamics. Concerning pure algebra, our observation is that some pieces of algebra can be developed in a context in which equality is not necessarily symmetric, i.e. in which the equality relation is replaced by an ordering relation. For example, notions like cancellativity or torsion-freeness are still sensible and very natural concepts in our ordered setting.
Marketing Milk Under Federal Orders in Texas.
Stelly, Randall
1960-01-01T23:59:59.000Z
SUMMARY Some Texas dairy farmers have been market- ing milk under federal orders since October 1951. In December 1959, 5,270, or 68 percent of Texas producers sold milk under the seven federal or- ders. In 1959 these producers marketed more than 1... is to maintain marketing con- ditions which will assure consumers a dependable supply of pure) and wholesome milk and which will be in the public interest. Federal orders stabilize market conditions for fluid milk and make the buying and selling of fluid...
Universality in higher order spin noise spectroscopy
Li, Fuxiang
2015-01-01T23:59:59.000Z
Higher order time-correlators of spontaneous spin fluctuations reveal the information about spin interactions. We argue that in a broad class of spin systems one can justify a phenomenological approach to explore such correlators. Thus, we predict that the 3rd and 4th order spin cumulants are described by a universal function that can be parametrized by a small set of parameters. We show that the fluctuation theorem constrains this function so that such correlators are fully determined by lowest nonlinear corrections to the free energy and the mean and variance of microscopic spin currents. We also provide an example of microscopic calculations for conduction electrons.
Word Order Variables in Patzun Kaqchikel
Kim, Sok-Ju
2011-10-03T23:59:59.000Z
clauses as in (1), transitive clauses with two DPs show SVO, VOS, and VSO word order. Consider the following sentences. (2) a. ri acin x-u-p’en ri c’aket def man com-3sE-make def chair...+statement In (2), the possibility of statement and question interpretations depends on SVO, VOS, and VSO word orders. In (2a), both statements and questions are possible in SVO clauses. In the verb- initial clauses as in (2b-c), if two DPs are definite...
Stoddard, Philip
Two orders of teleost fish, the Gymnotiformes from South America and the Mormyroidei in Africa flowing through sensory electroreceptor organs in the fish's skin. Electric fish can locate and identify been made in studies of electric fish and the central neurophysiology of electrosensory systems
Navon, Michael
. Introduction Reduced order model (ROM) technology is a rapidly growing discipline, with significant potential technique, it is possible to extract a set of modes characteristic of the database which constitutes of the kinetic energy of the flow. The leading POD modes are not able to dissipate enough energy since the main
Hollerbach, John M.
Abstract--This paper develops a static observer for estimating wind speed in order to control wind speed and angle control at a user position in a submersive virtual environment. Addition of wind display Active Wind Tunnel (TPAWT). Experiments on a scaled model of the TPAWT show that headwind flow stream
A study on the flow of molten iron in the hearth of blast furnace
Suh, Y.K.; Lee, Y.J.; Baik, C.Y. [Pohang Iron and Steel Co., Ltd. (Korea, Republic of). Technical Research Labs.
1996-12-31T23:59:59.000Z
The flow of molten iron in the hearth of blast furnace was investigated by using a water model test and a numerical simulation. The water model apparatus was set up in order to evaluate the effects of coke size, coke bed structure, drain rate, and coke free space on the fluidity of molten iron through measurement of residence time and visualization of flow pattern. In addition, the flow was calculated by solving momentum equation in porous media using finite element method. The residence time increased with the coke size decrease, but decreased with the drain rate increase. If small coke was placed in the center of deadman, peripheral flow was enhanced. The flow path was changed due to the coke free space.
Monitoring probe for groundwater flow
Looney, Brian B. (Aiken, SC); Ballard, Sanford (Albuquerque, NM)
1994-01-01T23:59:59.000Z
A monitoring probe for detecting groundwater migration. The monitor features a cylinder made of a permeable membrane carrying an array of electrical conductivity sensors on its outer surface. The cylinder is filled with a fluid that has a conductivity different than the groundwater. The probe is placed in the ground at an area of interest to be monitored. The fluid, typically saltwater, diffuses through the permeable membrane into the groundwater. The flow of groundwater passing around the permeable membrane walls of the cylinder carries the conductive fluid in the same general direction and distorts the conductivity field measured by the sensors. The degree of distortion from top to bottom and around the probe is precisely related to the vertical and horizontal flow rates, respectively. The electrical conductivities measured by the sensors about the outer surface of the probe are analyzed to determine the rate and direction of the groundwater flow.
Monitoring probe for groundwater flow
Looney, B.B.; Ballard, S.
1994-08-23T23:59:59.000Z
A monitoring probe for detecting groundwater migration is disclosed. The monitor features a cylinder made of a permeable membrane carrying an array of electrical conductivity sensors on its outer surface. The cylinder is filled with a fluid that has a conductivity different than the groundwater. The probe is placed in the ground at an area of interest to be monitored. The fluid, typically saltwater, diffuses through the permeable membrane into the groundwater. The flow of groundwater passing around the permeable membrane walls of the cylinder carries the conductive fluid in the same general direction and distorts the conductivity field measured by the sensors. The degree of distortion from top to bottom and around the probe is precisely related to the vertical and horizontal flow rates, respectively. The electrical conductivities measured by the sensors about the outer surface of the probe are analyzed to determine the rate and direction of the groundwater flow. 4 figs.
The effects between two slotted plate flow meter under single, two, three components flow condition
Park, Sang Hyan
2005-02-17T23:59:59.000Z
of Sparks and Brewer, only two kinds of flow patterns were found-stratified with wavy flow or annular-mist flow. In Kadambi?s work, these flow patterns were predicted via Figure 12. The transition between straified and annular flow occurs over the curve...
van de Meent, Jan-Willem; Somfai, Ellak; Sultan, Eric; van Saarloos, Wim
2008-01-01T23:59:59.000Z
We present simulations of coherent structures in compressible flows near the transition to turbulence using the Dissipative Particle Dynamics (DPD) method. The structures we find are remarkably consistent with experimental observations and DNS simulations of incompressible flows, despite a difference in Mach number of several orders of magnitude. The bifurcation from the laminar flow is bistable and shifts to higher Reynolds numbers when the fluid becomes more compressible. This work underlines the robustness of coherent structures in the transition to turbulence and illustrates the ability of particle-based methods to reproduce complex non-linear instabilities.
Nuclear reactor downcomer flow deflector
Gilmore, Charles B. (Greensburg, PA); Altman, David A. (Pittsburgh, PA); Singleton, Norman R. (Murrysville, PA)
2011-02-15T23:59:59.000Z
A nuclear reactor having a coolant flow deflector secured to a reactor core barrel in line with a coolant inlet nozzle. The flow deflector redirects incoming coolant down an annulus between the core barrel and the reactor vessel. The deflector has a main body with a front side facing the fluid inlet nozzle and a rear side facing the core barrel. The rear side of the main body has at least one protrusion secured to the core barrel so that a gap exists between the rear side of the main body adjacent the protrusion and the core barrel. Preferably, the protrusion is a relief that circumscribes the rear side of the main body.
Upstream swimming in microbiological flows
Mathijssen, Arnold J T M; Yeomans, Julia M; Doostmohammadi, Amin
2015-01-01T23:59:59.000Z
Interactions between microorganisms and their complex flowing environments are essential in many biological systems. We develop a model for microswimmer dynamics in non-Newtonian Poiseuille flows. We predict that swimmers in shear-thickening (-thinning) fluids migrate upstream more (less) quickly than in Newtonian fluids and demonstrate that viscoelastic normal stress differences reorient swimmers causing them to migrate upstream at the centreline, in contrast to well-known boundary accumulation in quiescent Newtonian fluids. Based on these observations, we suggest a sorting mechanism to select microbes by swimming speed.
Side Orders Potato Wedges 1.60
Dixon, Peter
Side Orders Potato Wedges £1.60 Choose your dip from: Soured Cream, Spicy Salsa or Barbecue Potato Wedges topped with Cheese £2.00 Choose your dip from: Soured Cream, Spicy Salsa or Barbecue Potato Wedges leaf salad, potato wedges and a soured cream dip. Refried Bean Burrito £5.25 Refried beans, onions
North Star Refrigerator: Order (2013-CE-5355)
Broader source: Energy.gov [DOE]
DOE ordered North Star Refrigerator Co., Inc. to pay a $8,000 civil penalty after finding North Star Refrigerator had failed to certify that any basic models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Commercial Refrigerator Door: Order (2013-CE-5351)
Broader source: Energy.gov [DOE]
DOE ordered Commercial Refrigerator Door Company, Inc. to pay a $8,000 civil penalty after finding Commercial Refrigerator Door had failed to certify that a variety of models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Duracold Refrigeration Manufacturing: Order (2013-CE-5342)
Broader source: Energy.gov [DOE]
DOE ordered Duracold Refrigeration Manufacturing Company, LLC to pay a $8,000 civil penalty after finding Duracold Refrigeration Manufacturing had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
MC Appliance: Order (2012-CE-1508)
Broader source: Energy.gov [DOE]
DOE ordered CNA International Inc. d/b/a MC Appliance Corporation to pay a $8,000 civil penalty after finding MC Appliance had failed to certify that certain models of room air conditioners comply with the applicable energy conservation standards.
Online Advertising Insertion Order Form Company name
McReynolds, Ben
Online Advertising Insertion Order Form Advertiser Company name: Address: City: State: Zip: Contact: Billing Instructions Gross Amount : $ Net Amount: $ Please refer to 2014 Advertising Rate Sheet Less 15% agency discount or other applicable discount (please specify below): Send invoices to: Advertiser
Lutron Electronics: Order (2012-SE-3796)
Broader source: Energy.gov [DOE]
DOE ordered Lutron Electronics Co., Inc. to pay a $13,000 civil penalty after finding Lutron Electronics had manufactured and distributed in commerce in the U.S. at least 79,000 units of various basic models, noncompliant Class A external power supplies.
A. METHOD OF PAYMENT: B. ORDERING
Palmeri, Thomas
Manual with NEW CD version of Student Materials. We provide one FREE shipping transaction via UPS Ground effective 5/8/13PALS Order Form With New Grades 2-6. With student materials CD. Without Brochure Option for training, please indicate training date: Grades 2 - 6 Student Materials DVD DVD with Student Materials ONLY
Thermo Products: Order (2011-SE-1603)
Broader source: Energy.gov [DOE]
DOE ordered Thermo Products, LLC, to pay a $6,000 civil penalty after finding Thermo Products had failed to conduct the required testing to certify that certain models of central air conditioning heat pumps comply with the applicable energy conservation standard.
Pseudo Boolean Programming for Partially Ordered Genomes
Fertin, Guillaume
Pseudo Boolean Programming for Partially Ordered Genomes SÃ©bastien Angibaud1 , Guillaume Fertin1.Angibaud,Guillaume.Fertin}@univ-nantes.fr, thevenin@lri.fr, vialette@univ-mlv.fr Abstract. Comparing genomes of different species is a crucial problem in comparative genomics. Different measures have been proposed to com- pare two genomes: number of common
American Cooler Technologies: Order (2013-CE-5305)
Broader source: Energy.gov [DOE]
DOE ordered American Cooler Technologies to pay a $8,000 civil penalty after finding American Cooler Technologies had failed to certify that certain models of walk-in coolers or freezers (WICF) components comply with the applicable energy conservation standards.
Equivalence and Order Section 1: Equivalence
Bernstein, Daniel
Unit EO Equivalence and Order Section 1: Equivalence The concept of an equivalence relation to us, as "equivalence relation" turns out to be just another name for "partition of a set." Our start with the definition. Definition 1 (Equivalence relation) An equivalence relation on a set
Royal Pacific: Order (2013-SE-33004)
Broader source: Energy.gov [DOE]
DOE ordered Royal Pacific, Ltd. to pay a $8,000 civil penalty after finding Royal Pacific had failed to certify that various basic models of medium base compact fluorescent lamps, ceiling fans, ceiling fan light kits, and illuminated exit signs comply with the applicable energy conservation standards.
Kingspan Insulated Panels: Order (2013-CE-5353)
Broader source: Energy.gov [DOE]
DOE ordered Kingspan Insulated Panels, Inc. to pay a $8,000 civil penalty after finding Kingspan Insulated Panels had failed to certify that any basic models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
GE Lighting Solutions: Order (2013-SE-4901)
Broader source: Energy.gov [DOE]
DOE ordered General Electric Lighting Solutions, LLC to pay a $5,360 civil penalty after finding GE Lighting Solutions had manufactured and distributed in commerce in the U.S. 30 units of basic model DR4-RTFB-23B and 177 units (of which 85 units remain in inventory) of basic model DR4-RTFB-77A-002, noncompliant traffic signal modules.
Broader source: Energy.gov [DOE]
DOE ordered R-Cold, Inc. to pay a $8,000 civil penalty after finding R-Cold had failed to certify that any basic models of walk-in cooler or freezer components comply with the applicable energy conservation standards.
Exploring intertwined orders in cuprate superconductors
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Tranquada, John M.
2015-03-01T23:59:59.000Z
The concept of intertwined orders has been introduced to describe the cooperative relationship between antiferromagnetic spin correlations and electron (or hole) pair correlations that develop in copper-oxide superconductors. This contrasts with systems in which, for example, charge-density-wave (CDW) order competes for Fermi surface area with superconductivity. La2-xBaxCuO4 with x = 0.125 provides an example in which the ordering of spin stripes coincides with the onset of two-dimensional superconducting correlations. The apparent frustration of the interlayer Josephson coupling has motivated the concept of the pair-density-wave superconductor, a state that theoretical calculations show to be energetically competitive with the uniform d-wave superconductor.more »Even at x = 0.095, where there is robust superconductivity below 32 K in zero field, the coexistence of strong, low-energy, incommensurate spin excitations implies a spatially modulated and intertwined pair wave function. Recent observations of CDW order in YBa2Cu3O6+x and other cuprate families have raised interesting questions regarding the general role of charge modulations and the relation to superconductivity. While there are differences in the doping dependence of the modulation wave vectors in YBa2Cu3O6+x and La2-xBaxCuO4, the maximum ordering strength is peaked at the hole concentration of 1/8 in both cases. There are also possible connections with the quantum oscillations that have been detected about the same hole concentration but at high magnetic fields. Resolving these relationships remains a research challenge.« less
Exploring intertwined orders in cuprate superconductors
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Tranquada, John M. [Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics & Materials Science Dept.
2015-03-01T23:59:59.000Z
The concept of intertwined orders has been introduced to describe the cooperative relationship between antiferromagnetic spin correlations and electron (or hole) pair correlations that develop in copper-oxide superconductors. This contrasts with systems in which, for example, charge-density-wave (CDW) order competes for Fermi surface area with superconductivity. La2-xBaxCuO4 with x = 0.125 provides an example in which the ordering of spin stripes coincides with the onset of two-dimensional superconducting correlations. The apparent frustration of the interlayer Josephson coupling has motivated the concept of the pair-density-wave superconductor, a state that theoretical calculations show to be energetically competitive with the uniform d-wave superconductor. Even at x = 0.095, where there is robust superconductivity below 32 K in zero field, the coexistence of strong, low-energy, incommensurate spin excitations implies a spatially modulated and intertwined pair wave function. Recent observations of CDW order in YBa2Cu3O6+x and other cuprate families have raised interesting questions regarding the general role of charge modulations and the relation to superconductivity. While there are differences in the doping dependence of the modulation wave vectors in YBa2Cu3O6+x and La2-xBaxCuO4, the maximum ordering strength is peaked at the hole concentration of 1/8 in both cases. There are also possible connections with the quantum oscillations that have been detected about the same hole concentration but at high magnetic fields. Resolving these relationships remains a research challenge.
The conformation change of model polymers in stochastic flow fields: Flow through fixed beds
Shaqfeh, Eric
The conformation change of model polymers in stochastic flow fields: Flow through fixed beds Alisa that as a polymer solution flows through a fixed bed, the pressure drop neces- sary to pump the solution may
Collective flow in small systems
Piotr Bozek; Wojciech Broniowski
2014-07-24T23:59:59.000Z
The large density of matter in the interaction region of the proton-nucleus or deuteron-nucleus collisions enables the collective expansion of the fireball. Predictions of the hydrodynamic model for the asymmetric transverse flow are presented and compared to experimental data.
Superconducting flux flow digital circuits
Hietala, V.M.; Martens, J.S.; Zipperian, T.E.
1995-02-14T23:59:59.000Z
A NOR/inverter logic gate circuit and a flip flop circuit implemented with superconducting flux flow transistors (SFFTs) are disclosed. Both circuits comprise two SFFTs with feedback lines. They have extremely low power dissipation, very high switching speeds, and the ability to interface between Josephson junction superconductor circuits and conventional microelectronics. 8 figs.
Neutrino Factory Mercury Flow Loop
McDonald, Kirk
Could require double containment of mercury Chase will certainly have a drain back into hot cell Decay 2010 #12;Hg Flow Overflow · Minimize pressure drops through piping Overflow Mercury Drain drops Gravity Drain Beam Dumptransitioning to 1 cm nozzle · Actual NF Hg inventory may reach SNS Gravity Drain
Message Flow Modeling Oscar Nierstrasz
Nierstrasz, Oscar
Message Flow Modeling Oscar Nierstrasz and Dennis Tsichritzis Computer Systems Research Group University of Toronto ABSTRACT A message management system provides users with a facility for automatically handling messages. This paper describes a technique for characterizing the behaviour of such a system
Rinse trough with improved flow
O`Hern, T.J.; Grasser, T.W.
1998-08-11T23:59:59.000Z
Novel rinse troughs accomplish thorough uniform rinsing. The troughs are suitable for one or more essentially planar objects having substantially the same shape. The troughs ensure that each surface is rinsed uniformly. The new troughs provide uniform rinse fluid flow over the objects` surfaces to accomplish a more thorough rinse than prior art troughs. 5 figs.
TCP Flow Controls Matthew Roughan
Roughan, Matthew
connections Much is known about the qualitative performance of the Internet the Internet works! Little is known about the quantitative performance of the TCP flow controls mostly by simulation, few analytic Paxson, "Measurements and Analysis of End-to-End Internet Dynamics" PhD Thesis Van Jacobson, "Congestion
Flow assurance and multiphase pumping
Nikhar, Hemant G.
2009-05-15T23:59:59.000Z
-in-Pipe?????????????????????????????????????. 42 Non-Jacketed Insulation Systems?????????????????????????? 42 Syntactic Insulation?????????????????????????????????. 42 Heating?????????????????????????????????????????? 43 Pipeline Configurations for Heating????????????????????????? 45 Subsea... Various Chemicals Used in Oil and Gas Production Operations????????. 38 15 Seawater Temperature Gradients???????????????????????.. 43 16 Flow Model Schematic?????????????????????????????.. 44 17 Deliverability Affected by Cooling Effect of Pipeline...
Comments on "Microscale flow visualization"
A. Kwang-Hua Chu
2005-10-22T23:59:59.000Z
We make comments on the presentation of Sinton's paper (Microfluidics and Nanofluidics {\\bf 1}: 2, 2004) about the microscale flow visualization since the effects of the roughness along the microfabricated wall upon the current macroflow visualization methods could be significant and cannot be neglected in microdomain and even nanodomain.
Fluid flow effects on electroplating
Kirkpatrick, J.R.
1990-09-01T23:59:59.000Z
The effects of fluid flow patterns on the electroplating of rotating cylindrically symmetric objects are examined. Ways are outlined for preventing undesirable spiral patterns on the plated surface. Estimates are given for the diffusion boundary later thickness for cylinders, disks, spheres, and cones. 16 refs., 7 figs., 1 tab.
Stopping Cooling Flows with Jets
Fabrizio Brighenti; William G. Mathews
2006-01-24T23:59:59.000Z
We describe 2D gasdynamical models of jets that carry mass as well as energy to the hot gas in galaxy clusters. These flows have many attractive attributes for solving the galaxy cluster cooling flow problem: Why the hot gas temperature and density profiles resemble cooling flows but show no spectral evidence of cooling to low temperatures. Using an approximate model for the cluster A1795, we show that mass-carrying jets can reduce the overall cooling rate to or below the low values implied by X-ray spectra. Biconical subrelativistic jets, described with several ad hoc parameters, are assumed to be activated when gas flows toward or cools near a central supermassive black hole. As the jets proceed out from the center they entrain more and more ambient gas. The jets lose internal pressure by expansion and are compressed by the ambient cluster gas, becoming rather difficult to observe. For a wide variety of initial jet parameters and several feedback scenarios the global cooling can be suppressed for many Gyrs while maintaining cluster temperature profiles similar to those observed. The intermittancy of the feedback generates multiple generations of X-ray cavities similar to those observed in the Perseus Cluster and elsewhere.
WENO schemes on arbitrary unstructured meshes for laminar, transitional and turbulent flows
Tsoutsanis, Panagiotis, E-mail: panagiotis.tsoutsanis@cranfield.ac.uk; Antoniadis, Antonios Foivos, E-mail: a.f.antoniadis@cranfield.ac.uk; Drikakis, Dimitris, E-mail: d.drikakis@cranfield.ac.uk
2014-01-01T23:59:59.000Z
This paper presents the development and implementation of weighted-essentially-non-oscillatory (WENO) schemes for viscous flows on arbitrary unstructured grids. WENO schemes up to fifth-order accurate have been implemented in conjunction with hybrid and non-hybrid unstructured grids. The schemes are investigated with reference to numerical and experimental results for the Taylor–Green vortex, as well as for laminar and turbulent flows around a sphere, and the turbulent shock-wave boundary layer interaction flow problem. The results show that the accuracy of the schemes depends on the arbitrariness of shape and orientation of the unstructured mesh elements, as well as the compactness of directional stencils. The WENO schemes provide a more accurate numerical framework compared to second-order and third-order total variation diminishing (TVD) methods, however, the fifth-order version of the schemes is computationally too expensive to make the schemes practically usable. On the other hand, the third-order variant offers an excellent numerical framework in terms of accuracy and computational cost compared to the fifth-order WENO and second-order TVD schemes. Parallelisation of the CFD code (henceforth labelled as UCNS3D), where the schemes have been implemented, shows that the present methods offer very good scalable performance.
SYMMETRY CHANGES AND DIPOLE ORDERINGS IN THE SMECTIC A TO C PHASE TRANSITIONS OF SECOND ORDER
Paris-Sud XI, Université de
exhibiting dipole ordering. A simple argument based on a mean-field calculation of the dipole- dipole energy phase. Recently the interest in this question was renewed by the first clear-cut evidence of dipole ordering in liquid crystals has not been studied from a general Article published online by EDP Sciences
Stephane Courteau; Avishai Dekel
2001-06-03T23:59:59.000Z
We give a brief review of recent developments in the study of the large-scale velocity field of galaxies since the international workshop on Cosmic Flows held in July 1999 in Victoria, B.C. Peculiar velocities (PVs) yield a tight and unique constraint on cosmological characteristics, independent of Lambda and biasing, such as the cosmological matter density parameter Omega_m and the convergence of bulk flows on large scales. Significant progress towards incorporating non-linear dynamics and improvements of velocity field reconstruction techniques have led to a rigorous control of errors and much refined cosmic flow analyses. Current investigations favor low-amplitude (< 250 km/s) bulk flows on the largest scales (< ~100 Mpc/h) probed reliably by existing redshift-distance surveys, consistent with favored LambdaCDM cosmogonies. Tidal field analyses also suggest that the Shapley Concentration, located behind the Great Attractor (GA), might play an important dynamical role, even at the Local Group. Low-amplitude density fluctuations on very large scales generate the overall large-scale streaming motions while massive attractors like the GA, and Perseus-Pisces account for smaller scale motions which are superposed on the large-scale flow. Likelihood analyses of galaxy PVs, in the framework of flat CDM cosmology, now provide tight constraints of Omega_m = 0.35 +/- 0.05. A four-fold size increase of our data base is expected in the next 4-5 years with the completion of next generation FP/TF surveys and automated supernovae searches within 20,000 km/s.
Court finds implied power to order refunds
Not Available
1993-02-01T23:59:59.000Z
The Oregon Court of Appeals has ruled that the state Public Utility Commission may require refunds of excess revenues collected under temporary rates that are subsequently found illegal, and that such refunds do not violate the rule against retroactive ratemaking. The case involved a 1989 order directing Pacific Northwest Bell Telephone Co. to refund a $10 million over-collection to customers. The Commission had defended its authority to force refunds of interim rates. The appeals court rejected the Commission's rationale, but upheld the refund order. It explained that Pacific Northwest was not entitled to keep excess revenues collected under an interim rate schedule that did not comply with its authorized revenue level. One judge dissented.
Next-to-Leading-Order Event Generators
Paolo Nason; Bryan Webber
2012-02-06T23:59:59.000Z
We review the methods developed for combining the parton shower approximation to QCD with fixed-order perturbation theory, in such a way as to achieve next-to-leading-order (NLO) accuracy for inclusive observables. This has made it possible to generate fully-simulated hadronic final states with the precision and stability of NLO calculations. We explain the underlying theory of the existing methods, MC@NLO and POWHEG, together with their similarities, differences, achievements and limitations. For illustration we mainly compare results on Higgs boson production at the LHC, with particular emphasis on the residual uncertainties arising from the different treatment of effects beyond NLO. We also briefly summarize the difference between these NLO + parton shower methods and matrix-element + parton shower matching, and current efforts to combine the two approaches.
Cooperativity and Contact Order in Protein Folding
Marek Cieplak
2004-01-11T23:59:59.000Z
The effects of cooperativity are studied within Go-Lennard-Jones models of proteins by making the contact interactions dependent on the proximity to the native conformation. The kinetic universality classes are found to remain the same as in the absence of cooperativity. For a fixed native geometry, small changes in the effective contact map may affect the folding times in a chance way and to the extent that is comparable to the shift in the folding times due to cooperativity. The contact order controlls folding scenarios: the average times necessary to bring pairs of amino acids into their near native separations depend on the sequential distances within the pairs. This dependence is largely monotonic, regardless of the cooperativity, and the dominant trend could be described by a single parameter like the average contact order. However, it is the deviations from the trend which are usually found to set the net folding times.
Liquid metal Flow Meter - Final Report
Andersen, C.; Hoogendoom, S.; Hudson, B.; Prince, J.; Teichert, K.; Wood, J.; Chase, K.
2007-01-30T23:59:59.000Z
Measuring the flow of liquid metal presents serious challenges. Current commercially-available flow meters use ultrasonic, electromagnetic, and other technologies to measure flow, but are inadequate for liquid metal flow measurement because of the high temperatures required by most liquid metals. As a result of the reactivity and high temperatures of most liquid metals, corrosion and leakage become very serious safety concerns. The purpose of this project is to develop a flow meter for Lockheed Martin that measures the flow rate of molten metal in a conduit.
AeroSys: Order (2011-SCE-1624)
Broader source: Energy.gov [DOE]
DOE ordered AeroSys, Inc. (AeroSys) to pay a $100,000 civil penalty after finding AeroSys had (1) failed to certify that certain models of space-constrained central air conditioners and air conditioning heat pumps comply with the applicable energy conservation standards; and (2) manufactured and distributed in commerce in the U.S. units of noncompliant models of space-constrained central air conditioners and air conditioning heat pumps.
Optical waveguides having flattened high order modes
Messerly, Michael Joseph; Beach, Raymond John; Heebner, John Edward; Dawson, Jay Walter; Pax, Paul Henry
2014-08-05T23:59:59.000Z
A deterministic methodology is provided for designing optical fibers that support field-flattened, ring-like higher order modes. The effective and group indices of its modes can be tuned by adjusting the widths of the guide's field-flattened layers or the average index of certain groups of layers. The approach outlined here provides a path to designing fibers that simultaneously have large mode areas and large separations between the propagation constants of its modes.
First Order Inflation in General Relativity
David Wands
1994-07-20T23:59:59.000Z
I give a general formulation of the constraints on models of inflation ended by a first order phase transition arising from the requirement that they do not produce too many large (observable) true vacuum voids -- the `big bubble problem'. It is shown that this constraint can be satisfied by a simple model in Einstein gravity -- a variant of `hybrid' or `false vacuum' inflation. (Talk presented at `Birth of the Universe' workshop Rome, May 1994)
Order in vertically aligned carbon nanotube arrays
Wang, Hsin [ORNL; Xu, Z [Michigan State University, East Lansing; Eres, Gyula [ORNL
2006-01-01T23:59:59.000Z
We report the direct measurements on the bulk morphology of vertically aligned multiwalled carbon nanotube (CNT) arrays using small angle neutron scattering (SANS). SANS measurements at different heights of CNT arrays corresponding to different stages of the growth reveal increasing alignment order along the thickness and two distinctly different CNT morphologies. The observations suggest that the evolution of the macroscopic CNT morphologies be driven by competing collective growth and spatial constraints.
Order of wetting transitions in electrolyte solutions
Ibagon, Ingrid, E-mail: ingrid@is.mpg.de; Bier, Markus, E-mail: bier@is.mpg.de; Dietrich, S. [Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, Germany and IV. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart (Germany)] [Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, Germany and IV. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart (Germany)
2014-05-07T23:59:59.000Z
For wetting films in dilute electrolyte solutions close to charged walls we present analytic expressions for their effective interface potentials. The analysis of these expressions renders the conditions under which corresponding wetting transitions can be first- or second-order. Within mean field theory we consider two models, one with short- and one with long-ranged solvent-solvent and solvent-wall interactions. The analytic results reveal in a transparent way that wetting transitions in electrolyte solutions, which occur far away from their critical point (i.e., the bulk correlation length is less than half of the Debye length) are always first-order if the solvent-solvent and solvent-wall interactions are short-ranged. In contrast, wetting transitions close to the bulk critical point of the solvent (i.e., the bulk correlation length is larger than the Debye length) exhibit the same wetting behavior as the pure, i.e., salt-free, solvent. If the salt-free solvent is governed by long-ranged solvent-solvent as well as long-ranged solvent-wall interactions and exhibits critical wetting, adding salt can cause the occurrence of an ion-induced first-order thin-thick transition which precedes the subsequent continuous wetting as for the salt-free solvent.
Jet Veto Clustering Logarithms Beyond Leading Order
Simone Alioli; Jonathan R. Walsh
2014-11-23T23:59:59.000Z
Many experimental analyses separate events into exclusive jet bins, using a jet algorithm to cluster the final state and then veto on jets. Jet clustering induces logarithmic dependence on the jet radius R in the cross section for exclusive jet bins, a dependence that is poorly controlled due to the non-global nature of the clustering. At jet radii of experimental interest, the leading order (LO) clustering effects are numerically significant, but the higher order effects are currently unknown. We rectify this situation by calculating the most important part of the next-to-leading order (NLO) clustering logarithms of R for any 0-jet process, which enter as $O(\\alpha_s^3)$ corrections to the cross section. The calculation blends subtraction methods for NLO calculations with factorization properties of QCD and soft-collinear effective theory (SCET). We compare the size of the known LO and new NLO clustering logarithms and find that the impact of the NLO terms on the 0-jet cross section in Higgs production is small. This brings clustering effects under better control and may be used to improve uncertainty estimates on cross sections with a jet veto.
A Simple Heat-Flow Quality Function And Appraisal Of Heat-Flow...
And Heat-Flow Estimates From The Uk Geothermal Catalogue Abstract A comprehensive database of temperature, heat flow, thermal conductivity and geochemistry is the basis of...
Structure of processes in flow reactor and closed reactor: Flow reactor
Greifswald, Ernst-Moritz-Arndt-UniversitÃ¤t
Structure of processes in flow reactor and closed reactor: Flow reactor Closed reactor Active Zone -- chemical quasi- equilibria, similarity principles and macroscopic kinetics", in: Lectures on Plasma Physics
Soluble Lead Flow Battery: Soluble Lead Flow Battery Technology
None
2010-09-01T23:59:59.000Z
GRIDS Project: General Atomics is developing a flow battery technology based on chemistry similar to that used in the traditional lead-acid battery found in nearly every car on the road today. Flow batteries store energy in chemicals that are held in tanks outside the battery. When the energy is needed, the chemicals are pumped through the battery. Using the same basic chemistry as a traditional battery but storing its energy outside of the cell allows for the use of very low cost materials. The goal is to develop a system that is far more durable than today’s lead-acid batteries, can be scaled to deliver megawatts of power, and which lowers the cost of energy storage below $100 per kilowatt hour.
Experimental investigation and CFD analysis on cross flow in the core of PMR200
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Lee, Jeong -Hun; Yoon, Su -Jong; Cho, Hyoung -Kyu; Jae, Moosung; Park, Goon -Cherl
2015-09-01T23:59:59.000Z
The Prismatic Modular Reactor (PMR) is one of the major Very High Temperature Reactor (VHTR) concepts, which consists of hexagonal prismatic fuel blocks and reflector blocks made of nuclear gradegraphite. However, the shape of the graphite blocks could be easily changed by neutron damage duringthe reactor operation and the shape change can create gaps between the blocks inducing the bypass flow.In the VHTR core, two types of gaps, a vertical gap and a horizontal gap which are called bypass gap and cross gap, respectively, can be formed. The cross gap complicates the flow field in the reactor core by connectingmore »the coolant channel to the bypass gap and it could lead to a loss of effective coolant flow in the fuel blocks. Thus, a cross flow experimental facility was constructed to investigate the cross flow phenomena in the core of the VHTR and a series of experiments were carried out under varying flow rates and gap sizes. The results of the experiments were compared with CFD (Computational Fluid Dynamics) analysis results in order to verify its prediction capability for the cross flow phenomena. Fairly good agreement was seen between experimental results and CFD predictions and the local characteristics of the cross flow was discussed in detail. Based on the calculation results, pressure loss coefficient across the cross gap was evaluated, which is necessary for the thermo-fluid analysis of the VHTR core using a lumped parameter code.« less
Wang, Z J
2012-12-06T23:59:59.000Z
The overriding objective for this project is to develop an efficient and accurate method for capturing strong discontinuities and fine smooth flow structures of disparate length scales with unstructured grids, and demonstrate its potentials for problems relevant to DOE. More specifically, we plan to achieve the following objectives: 1. Extend the SV method to three dimensions, and develop a fourth-order accurate SV scheme for tetrahedral grids. Optimize the SV partition by minimizing a form of the Lebesgue constant. Verify the order of accuracy using the scalar conservation laws with an analytical solution; 2. Extend the SV method to Navier-Stokes equations for the simulation of viscous flow problems. Two promising approaches to compute the viscous fluxes will be tested and analyzed; 3. Parallelize the 3D viscous SV flow solver using domain decomposition and message passing. Optimize the cache performance of the flow solver by designing data structures minimizing data access times; 4. Demonstrate the SV method with a wide range of flow problems including both discontinuities and complex smooth structures. The objectives remain the same as those outlines in the original proposal. We anticipate no technical obstacles in meeting these objectives.
Self-heating in kinematically complex magnetohydrodynamic flows
Osmanov, Zaza; Poedts, Stefaan
2012-01-01T23:59:59.000Z
The non-modal self-heating mechanism driven by the velocity shear in kinematically complex magnetohydrodynamic (MHD) plasma flows is considered. The study is based on the full set of MHD equations including dissipative terms. The equations are linearized and unstable modes in the flow are looked for. Two different cases are specified and studied: (a) the instability related to an exponential evolution of the wave vector; and (b) the parametric instability, which takes place when the components of the wave vector evolve in time periodically. By examining the dissipative terms, it is shown that the self-heating rate provided by viscous damping is of the same order of magnitude as that due to the magnetic resistivity. It is found that the heating efficiency of the exponential instability is higher than that of the parametric instability.
Model Reduction of Turbulent Fluid Flows Using the Supply Rate
Sharma, A S
2013-01-01T23:59:59.000Z
A method for finding reduced-order approximations of turbulent flow models is presented. The method preserves bounds on the production of turbulent energy in the sense of the $\\curly{L}_2$ norm of perturbations from a notional laminar profile. This is achieved by decomposing the Navier-Stokes system into a feedback arrangement between the linearised system and the remaining, normally neglected, nonlinear part. The linear system is reduced using a method similar to balanced truncation, but preserving bounds on the supply rate. The method involves balancing two algebraic Riccati equations. The bounds are then used to derive bounds on the turbulent energy production. An example of the application of the procedure to flow through a long straight pipe is presented. Comparison shows that the new method approximates the supply rate at least as well as, or better than, canonical balanced truncation.
N site ordering effect on partially ordered Fe{sub 16}N{sub 2}
Ji Nian; Wang Jianping [Department of Electrical and Computer Engineering, The Center for Micromagnetics and Information Technologies (MINT), University of Minnesota, 200 Union St SE, 4-174 EE/CSci, Minneapolis, Minnesota 55455 (United States); Allard, Lawrence F.; Lara-Curzio, Edgar [High Temperature Materials Laboratory, Materials Science and Technology Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831 (United States)
2011-02-28T23:59:59.000Z
Partially ordered Fe{sub 16}N{sub 2} thin films have been fabricated on Fe (001)-buffered GaAs (001) single-crystal substrates by a facing target sputtering process. The saturation magnetization has been systematically investigated as a function of N site ordering in partially ordered Fe{sub 16}N{sub 2} thin films, which is found to be increased monotonically with the increase in the N site ordering parameter, reaching up to 2.68 T at high ordering case. A model discussion is provided based on the partial localization of 3d electron states in this material system, which successfully rationalizes the formation of the giant saturation magnetization in chemically ordered Fe{sub 16}N{sub 2}. We further demonstrate that the average magnetic moment of partially ordered Fe{sub 16}N{sub 2} sensitively depends on the special arrangement of Fe{sub 6}N clusters, which is the key to realize high magnetic moment in this material system.
Electromagnetically Induced Flows Michiel de Reus
Vuik, Kees
Electromagnetically Induced Flows in Water Michiel de Reus 8 maart 2013 () Electromagnetically Conclusion and future research () Electromagnetically Induced Flows 2 / 56 #12;1 Introduction 2 Maxwell Navier Stokes equations 5 Simulations 6 Conclusion and future research () Electromagnetically Induced
Numerical simulation of electrokinetically driven micro flows
Hahm, Jungyoon
2005-11-01T23:59:59.000Z
Spectral element based numerical solvers are developed to simulate electrokinetically driven flows for micro-fluidic applications. Based on these numerical solvers, basic phenomena and devices for electrokinetic applications in micro and nano flows...
Decentralized information flow control on a cluster
Cliffer, Natan Tsvi Cohen
2007-01-01T23:59:59.000Z
Information flow control security models can prevent programs from divulging sensitive information in unexpected ways. There has been significant work on tracking information flow between processes in the same computer at ...
Hingeless flow control over delta wing planforms
Moeller, Edward Brian
1999-01-01T23:59:59.000Z
An experimental investigation of hingeless flow control by vortex breakdown manipulation over a delta wing is described. Employed as a method of longitudinal control for slender wing platforms, the performance of this active flow control technique...
Numerical simulation of electrokinetically driven micro flows
Hahm, Jungyoon
2005-11-01T23:59:59.000Z
to control mixed electroosmotic/pressure driven flow in the grooved micro-channel. The controlled flow pattern enables entrapment and release of prescribed amounts of scalar species in the grooves. As another application, hydrodynamic/ electrokinetic focusing...
Broader source: Energy.gov [DOE]
This simple spreadsheet model estimates either the flow rate required to produce a specified level of power output, or the power output that can be produced from a specified flow rate.
An optical investigation of air particle flows.
McCluskey, Denise R
This thesis is a fundamental study of air-particle flow fields where the experimental parameters are characteristics of coal-fired electricity generating stations. The optical flow field measurement technique Particle Image Velocimetry (PIV...
Competition between s-wave order and d-wave order in holographic superconductors
Li-Fang Li; Rong-Gen Cai; Li Li; Yong-Qiang Wang
2014-08-12T23:59:59.000Z
We study competition between s-wave order and d-wave order through two holographic superconductor models. We find that once the coexisting phase appears, it is always thermodynamically favored, and that the coexistence phase is narrow and one condensate tends to kill the other. The phase diagram is constructed for each model in terms of temperature and the ratio of charges of two orders. We further compare the behaviors of some thermodynamic quantities, and discuss the different aspects and identical ones between two models.
A theory for radial jet reattachment flow
Hadden, Lynne Loise
1987-01-01T23:59:59.000Z
An approximate analysis for determining the flow field characteristics of laminar and turbulent radial jet reattachment flow was carried out, The objective of this research was to investigate and report the influence of the geometry and flow rate.... Mixing at the boundary of the jet combined with the reattachment phenomenon results in a relatively low pressure in the recirculation region of the jet flow. The coefficient of pressure, reattachment angle, and reattachment radius are shown...
Anisotropic collective flow of a Lorentz gas
Nicolas Borghini; Clement Gombeaud
2011-06-30T23:59:59.000Z
Analytical results for the anisotropic collective flow of a Lorentz gas of massless particles scattering on fixed centres are presented.
Symanzik flow on HISQ ensembles
The MILC Collaboration; A. Bazavov; C. Bernard; N. Brown; C. DeTar; J. Foley; Steven Gottlieb; U. M. Heller; J. E. Hetrick; J. Laiho; L. Levkova; M. Oktay; R. L. Sugar; D. Toussaint; R. S. Van de Water; R. Zhou
2013-11-06T23:59:59.000Z
We report on a scale determination with gradient-flow techniques on the $N_f = 2 + 1 + 1$ HISQ ensembles generated by the MILC collaboration. The lattice scale $w_0/a$, originally proposed by the BMW collaboration, is computed using Symanzik flow at four lattice spacings ranging from 0.15 to 0.06 fm. With a Taylor series ansatz, the results are simultaneously extrapolated to the continuum and interpolated to physical quark masses. We give a preliminary determination of the scale $w_0$ in physical units, along with associated systematic errors, and compare with results from other groups. We also present a first estimate of autocorrelation lengths as a function of flowtime for these ensembles.
Cascade redox flow battery systems
Horne, Craig R.; Kinoshita, Kim; Hickey, Darren B.; Sha, Jay E.; Bose, Deepak
2014-07-22T23:59:59.000Z
A reduction/oxidation ("redox") flow battery system includes a series of electrochemical cells arranged in a cascade, whereby liquid electrolyte reacts in a first electrochemical cell (or group of cells) before being directed into a second cell (or group of cells) where it reacts before being directed to subsequent cells. The cascade includes 2 to n stages, each stage having one or more electrochemical cells. During a charge reaction, electrolyte entering a first stage will have a lower state-of-charge than electrolyte entering the nth stage. In some embodiments, cell components and/or characteristics may be configured based on a state-of-charge of electrolytes expected at each cascade stage. Such engineered cascades provide redox flow battery systems with higher energy efficiency over a broader range of current density than prior art arrangements.
Supercritical flow in rectangular expansions
Walsh, Peter.
1968-01-01T23:59:59.000Z
is the differential element of length along C. Equations [7] and [8] may be rearranged in the following manner: du = ? dx + ? dy du Qu gx ay dv = ? dx + ? dy 3v av 'bx Py [10] where du = (3u/Bs)ds, dv = (pv/3s)ds, dx = (3x/as)ds, and dy = (s y/p s) ds. The four... common tangent A P . Since a disturbance travels from A to P in n 1 the same time that a particle moves from A to A it follows that n A P = sin S =? A A v 1 n where I9 is the angle between the shock wave and the direction of flow. When the flow...
Characterizing flow fluctuations with moments
Rajeev S. Bhalerao; Jean-Yves Ollitrault; Subrata Pal
2015-01-22T23:59:59.000Z
We present a complete set of multiparticle correlation observables for ultrarelativistic heavy-ion collisions. These include moments of the distribution of the anisotropic flow in a single harmonic, and also mixed moments, which contain the information on correlations between event planes of different harmonics. We explain how all these moments can be measured using just two symmetric subevents separated by a rapidity gap. This presents a multi-pronged probe of the physics of flow fluctuations. For instance, it allows to test the hypothesis that event-plane correlations are generated by non-linear hydrodynamic response. We illustrate the method with simulations of events in A MultiPhase Transport (AMPT) model.
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasma | Department ofEnergy 9 LehmanDepartment of Energy NuclearSplit Rock EnergyBRITISHSales Order
Administrative Order, June 13, 2000 Summary
Office of Environmental Management (EM)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362 334 318CubicCommercial Markets | Department ofAGA10 AcquisitionAdministrative Order No.
Representations of groups of order 16
McCarthy, Edmond Robert
1966-01-01T23:59:59.000Z
, 16) K - {10, 14) The analysis al. so shows that G contains three subgroups H. of order 2; only one of which is normal. This is the i subgroup consisting of the elements (1, 5}. The factor group G/H is isomorphic to C 4 C2. Since the Cayley table..., 13 10, 14 11, 15 37 With this correspondence established we need only refer back to Table II, the character table of C 4 C2, to begin writing out representations of Group Six. For example, in Table II we find D&(3) = -1. If TK...
Battelle Consent Order (WCO-2014-01)
Office of Environmental Management (EM)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362 of Thomas P. D'Agostino2015 GTODesierto SA deAugust 5, 2010Order (2013-CE-48004)NE-ID-1122620585
Mapping topological order in coordinate space
Bianco, Raffaello; Resta, Raffaele [Dipartimento di Fisica, Universita di Trieste (Italy) and DEMOCRITOS National Simulation Center, IOM-CNR, Trieste (Italy)
2011-12-15T23:59:59.000Z
The organization of the electrons in the ground state is classified by means of topological invariants, defined as global properties of the wave function. Here we address the Chern number of a two-dimensional insulator and we show that the corresponding topological order can be mapped by means of a ''topological marker'', defined in r space, and which may vary in different regions of the same sample. Notably, this applies equally well to periodic and open boundary conditions. Simulations over a model Hamiltonian validate our theory.
Near approximations via general ordered topological spaces
M. Abo-Elhamayel
2014-12-27T23:59:59.000Z
Rough set theory is a new mathematical approach to imperfect knowledge. The notion of rough sets is generalized by using an arbitrary binary relation on attribute values in information systems, instead of the trivial equality relation. The topology induced by binary relations is used to generalize the basic rough set concepts. This paper studies near approximation via general ordered topological approximation spaces which may be viewed as a generalization of the study of near approximation from the topological view. The basic concepts of some increasing (decreasing) near approximations, increasing (decreasing) near boundary regions and increasing (decreasing) near accuracy were introduced and sufficiently illustrated. Moreover, proved results, implications and add examples.
Energy flows : empowering New Orleans
Guiraud, Florence Nathalie
2012-01-01T23:59:59.000Z
This thesis claims to develop alternative energy-harvesting systems by looking at their implementation at the residential scale in order to facilitate the economical autonomy of a community and thus improve its living ...
Countercurrent flow absorber and desorber
Wilkinson, William H. (Columbus, OH)
1984-01-01T23:59:59.000Z
Countercurrent flow absorber and desorber devices are provided for use in absorption cycle refrigeration systems and thermal boosting systems. The devices have increased residence time and surface area resulting in improved heat and mass transfer characteristics. The apparatuses may be incorporated into open cycle thermal boosting systems in which steam serves both as the refrigerant vapor which is supplied to the absorber section and as the supply of heat to drive the desorber section of the system.
Countercurrent flow absorber and desorber
Wilkinson, W.H.
1984-10-16T23:59:59.000Z
Countercurrent flow absorber and desorber devices are provided for use in absorption cycle refrigeration systems and thermal boosting systems. The devices have increased residence time and surface area resulting in improved heat and mass transfer characteristics. The apparatuses may be incorporated into open cycle thermal boosting systems in which steam serves both as the refrigerant vapor which is supplied to the absorber section and as the supply of heat to drive the desorber section of the system. 9 figs.
Microgravity Flow Regime Transition Modeling
Shephard, Adam M.
2010-07-14T23:59:59.000Z
by Ghrist (2008) where an existing computer code, RELAP 5-3D, demonstrated the limitations of currently available computational modeling when applied to zero-g conditions. 1.2.2 EXPERIMENTAL APPARATUS All flow regime mapping experiments consist of a... ............................................................... 9 2.3 Dukler et al. 1988/Janicot 1988 ............................................. 9 2.4 Colin et al. 1991 .................................................................... 11 2.5 Huckerby and Rezkallah 1992...
Hoepffner, Jérôme
60 0 10 20 30 40 50 60 0 0.5 1 1.5 2 Model parameters r1 r2 #12;Optimisation : the Lagrange · Covariance and energy · Disturbances · Optimization · Time varying gains · Steady state kernels #12;Flow(f)H Energy E[E(q(t))] = Tr(E[q(t)q(t) ] #12;Linear filtering Propagation of the estimation error ~q ~q = (A
Geothermal Heat Flow and Existing Geothermal Plants | Department...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Geothermal Heat Flow and Existing Geothermal Plants Geothermal Heat Flow and Existing Geothermal Plants Geothermal Heat Flow and Existing Plants With plants in development. Click...
Automatic Control Flow Generation from Software Architectures
Lau, Kung-Kiu
-time automatically. To achieve this we take a different approach to system construction. We take control out.-K. Lau and V. Ukis generic connectors, and generate control flow of the system automatically at run in different systems with different control flows. Our automatic runtime control flow generation not only
Duncan, D.B.
1992-11-24T23:59:59.000Z
A method and laser apparatus are disclosed which provide for a cross-flow of gas near one end of a laser discharge tube. The cross-flow of gas causes a concentration gradient which affects diffusion of contaminants in the discharge tube towards the cross-flow of the gas, which contaminants are then withdrawn from the discharge tube. 1 figure.
Liquid cooled counter flow turbine bucket
Dakin, James T. (Schenectady, NY)
1982-09-21T23:59:59.000Z
Means and a method are provided whereby liquid coolant flows radially outward through coolant passages in a liquid cooled turbine bucket under the influence of centrifugal force while in contact with countercurrently flowing coolant vapor such that liquid is entrained in the flow of vapor resulting in an increase in the wetted cooling area of the individual passages.
General Message Flow Modulator Ann E. Siebert
Boyer, Robert Stephen
General Message Flow Modulator Ann E. Siebert Donald I. Good Technical Report #42 March 1984 (512) 471-1901 #12;Abstract The general message flow modulator is a high level design of a family of mechanisms for controlling the flow of messages from a source to a destination. This family of mechanisms has
Flow and Plate Motion in Compressor Valves
Twente, Universiteit
Flow and Plate Motion in Compressor Valves #12;Flow and Plate Motion in Compressor Valves R.A. Habing Cover Image: 4-stage reciprocating compressor system, Courtesy of Ariel Corporation Thesis.A. Habing, Enschede, The Netherlands #12;FLOW AND PLATE MOTION IN COMPRESSOR VALVES PROEFSCHRIFT ter
Dissecting the pressure field in tidal flow
Dissecting the pressure field in tidal flow past a headland: When is form drag "real?" Sally Warner of oscillating flow H L HL velocity form drag power average power floodslack work done on system #12;0 0 0 0 90 180 270 360 90 180 270 360 0 degrees Drag of oscillating flow H L HL velocity form drag power average
Development of a diffraction imaging flow cytometer
, of the laminar flow and the sheath fluid usually has a large curvature and refrac- tive index difference. Often morphology of a particle. We present a jet-in-fluid design of flow chamber for acquisition of clear diffraction images in a laminar flow. Diffraction images of polystyrene spheres of different diameters were
Numerical Methods for Incompressible Viscous Flow
Frey, Pascal
. The simplest viscous flow problems involve just one fluid in the laminar regime. The governing equations in nature and technological devices are turbulent. The tran- sition from laminar to turbulent flow phenomena, laminar or turbulent viscous flow is coupled with other processes, such as heat tra
Generalized correlation for foam flow in tubes
Cotter, Carol Lynnette
1996-01-01T23:59:59.000Z
with respect to foam in the laminar flow region. A semi-automated system to collect pressure drop-flow rate data for gas in liquid foams was constructed in which foam is created by a foam generator and the pressure drop resulting from the foam flow is measured...
Secured Information Flow for Asynchronous Sequential Processes
Paris-Sud XI, Université de
Secured Information Flow for Asynchronous Sequential Processes Isabelle Attali, Denis Caromel for unauthorized information flows. As a final result, all authorized communication paths are secure: no disclosure a new issue in data confidentiality: authorization of secured information flow transiting (by the mean
Non-equilibrium first order transition marks the mechanical failure of glasses
D. V. Denisov; M. T. Dang; B. Struth; A. Zaccone; G. H. Wegdam; P. Schall
2015-07-16T23:59:59.000Z
Glasses acquire their solid-like properties by cooling from the supercooled liquid via a continuous transition known as the glass transition. Recent research on soft glasses indicates that besides temperature, another route to liquify glasses is by application of stress that forces relaxation and flow. Here we provide experimental evidence that the stress-induced onset of flow of glasses occurs via a sharp first order-like transition. Using simultaneous x-ray scattering during the oscillatory rheology of a colloidal glass, we identify a sharp symmetry change from anisotropic solid to isotropic liquid structure at the transition from the linear to the nonlinear regime. Concomitantly, intensity fluctuations sharply acquire liquid distributions. These observations identify the yielding of glasses to increasing stress as sharp affine-to-nonaffine transition, providing a new conceptual paradigm of the yielding of this technologically important class of materials, and offering new perspectives on the glass transition.
First-Order System Least Squares for Second-Order Partial ...
Dec 6, 2003 ... mixed ?nite element spaces from {27} in order to approximate H (div). However, any ..... Let s : min(k, r) and assume that p E HS+1(Q) and u E.
Order acceptance and scheduling at a make-to-order system using revenue management
Jalora, Anshu
2006-10-30T23:59:59.000Z
Make-to-order (MTO) systems have been traditionally popular in manufacturing industries that either seek to provide greater variety to their customers or make products that are unique to their customers. More recently, ...
FOURTH ORDER ACCURACY FOR A CUBIC SPLINE COLLOCATION METHOD
FOURTH ORDER ACCURACY FOR A CUBIC SPLINE COLLOCATION METHOD CHARLES A. McCARTHY* This note. Agreement of U with u to fourth order is perhaps not so surprising { Gaussian quadrature of this order is, after all, fourth order accurate and one could well expect this order of accuracy to be re ected
FOURTH ORDER ACCURACY FOR A CUBIC SPLINE COLLOCATION METHOD
FOURTH ORDER ACCURACY FOR A CUBIC SPLINE COLLOCATION METHOD CHARLES A. McCARTHY* This note to order h 4 with u x , u y , and u xy in two dimensions. Agreement of U with u to fourth order is perhaps not so surprising -- Gaussian quadrature of this order is, after all, fourth order accurate and one could
Optic Flow Sensor Objective: Using optic flow sensors, detect and track
Wirthlin, Michael J.
Optic Flow Sensor Objective: Using optic flow sensors, detect and track the walls of a rural or urban terrain. Principle Investigators: Tim McLain, Randy Beard Optic Flow Sensor · Computationally factor 1" x 1" x 1.5" · Inexpensive $80 including optics · Fast computes optic flow at 2300 fps2006
The Two Way Flow of Wood Carbon vs the One-Way Flow
Brown, Sally
Use Life cycle Assessment to Understand Alternatives Use Life cycle Assessment to UnderstandThe Two Way Flow of Wood Carbon vs the One-Way Flow of Fossil Emissions The Two Way Flow of Wood Carbon vs the One-Way Flow of Fossil Emissions Elaine Oneil Executive Director, CORRIM & Research
Elongational-flow-induced scission of DNA nanotubes in laminar flow Rizal F. Hariadi*
Winfree, Erik
-induced scission are pro- foundly affected by the fluid flow and the polymer bond strengths. In this paper, laminarElongational-flow-induced scission of DNA nanotubes in laminar flow Rizal F. Hariadi* Department libraries in shotgun ge- nome sequencing 24 . The fluid-flow-induced mechanical shearing of prion fibrils
Review and selection of unsaturated flow models
NONE
1993-09-10T23:59:59.000Z
Under the US Department of Energy (DOE), the Civilian Radioactive Waste Management System Management and Operating Contractor (CRWMS M&O) has the responsibility to review, evaluate, and document existing computer ground-water flow models; to conduct performance assessments; and to develop performance assessment models, where necessary. In the area of scientific modeling, the M&O CRWMS has the following responsibilities: To provide overall management and integration of modeling activities. To provide a framework for focusing modeling and model development. To identify areas that require increased or decreased emphasis. To ensure that the tools necessary to conduct performance assessment are available. These responsibilities are being initiated through a three-step process. It consists of a thorough review of existing models, testing of models which best fit the established requirements, and making recommendations for future development that should be conducted. Future model enhancement will then focus on the models selected during this activity. Furthermore, in order to manage future model development, particularly in those areas requiring substantial enhancement, the three-step process will be updated and reported periodically in the future.
Exact Convex Relaxation of Optimal Power Flow in Radial Networks
Gan, LW; Li, N; Topcu, U; Low, SH
2015-01-01T23:59:59.000Z
The optimal power flow (OPF) problem determines a network operating point that minimizes a certain objective such as generation cost or power loss. It is nonconvex. We prove that a global optimum of OPF can be obtained by solving a second-order cone program, under a mild condition after shrinking the OPF feasible set slightly, for radial power networks. The condition can be checked a priori, and holds for the IEEE 13, 34, 37, 123-bus networks and two real-world networks.
Collective flow of photons in strongly coupled gauge theories
Yang, Di-Lun
2015-01-01T23:59:59.000Z
We investigate the shear viscosity of photons in a strongly coupled quark gluon plasma (QGP). We find that the shear viscosity due to the photon-parton scattering up to the leading order of electromagnetic coupling is suppressed when the coupling of the QGP is increased, which stems from the blue-shift of the thermal-photon spectrum at strong coupling. In addition, the shear viscosity rapidly increases near the deconfinement transition. We argue that the suppression of the photon shear viscosity in the QGP phase could lead to an enhancement of the anisotropic flow of direct photons in heavy ion collisions.
Vesicle dynamics in elongation flow: Wrinkling instability and bud formation
Vasiliy Kantsler; Enrico Segre; Victor Steinberg
2007-04-30T23:59:59.000Z
We present experimental results on the relaxation dynamics of vesicles subjected to a time-dependent elongation flow. We observed and characterized a new instability, which results in the formation of higher order modes of the vesicle shape (wrinkles), after a switch in the direction of the gradient of the velocity. This surprising generation of membrane wrinkles can be explained by the appearance of a negative surface tension during the vesicle deflation, due to compression in a sign-switching transient. Moreover, the formation of buds in the vesicle membrane has been observed in the vicinity of the dynamical transition point.
Vesicle dynamics in elongation flow: Wrinkling instability and bud formation
Kantsler, Vasiliy; Steinberg, Victor; 10.1103/PhysRevLett.99.178102
2011-01-01T23:59:59.000Z
We present experimental results on the relaxation dynamics of vesicles subjected to a time-dependent elongation flow. We observed and characterized a new instability, which results in the formation of higher order modes of the vesicle shape (wrinkles), after a switch in the direction of the gradient of the velocity. This surprising generation of membrane wrinkles can be explained by the appearance of a negative surface tension during the vesicle deflation, due to compression in a sign-switching transient. Moreover, the formation of buds in the vesicle membrane has been observed in the vicinity of the dynamical transition point.
Bixler, N.E.; Eaton, R.R.
1985-12-31T23:59:59.000Z
Permeability and moisture content curves for partially saturated, fractured, welded tuffs, such as those found near the site of a prospective nuclear waste repository at Yucca Mountain, Nevada, are highly nonlinear. We illustrate, by means of one-dimensional infiltration in multilayered fractured tuff, the numerical instabilities that can arise when analyzing the flow in such porous materials. We compare the results obtained using two numerical schemes for treating the nonlinearities: the first uses a first-order Piccard iteration scheme to attain convergence at each time step; the second uses a second-order Newton-Raphson iteration procedure to attain convergence. The Piccard scheme converges when flow through the rock matrix dominates but does not converge when flow through fractures dominates. On the other hand, the Newton-Raphson scheme converges in both situations. 6 refs., 10 figs.
Bixler, N.E.; Eaton, R.R.
1986-08-01T23:59:59.000Z
Permeability and moisture content curves for partially saturated, fractured, welded tuffs, such as those found near the site of a prospective nuclear waste repository at Yucca Mountain, Nevada, are highly nonlinear. The authors illustrate, by means of a one-dimensional problem of infiltration into multilayered fractured tuff, the numerical instabilities that can arise when analyzing the flow in such porous materials. The authors compare the results obtained using two numerical schemes for treating the nonlinearities: the first uses a first-order Piccard iteration scheme to attain convergence at each time step; the second uses a second-order Newton-Raphson iteration procedure to attain convergence. The Piccard scheme converges when flow through the rock matrix dominates but does not converge when flow through fractures dominates. On the other hand, the Newton-Raphson scheme converges in both situations.
Viscous corrections to anisotropic flow and transverse momentum spectra from transport theory
Plumari, Salvatore; Greco, Vincenzo; Ollitrault, Jean-Yves
2015-01-01T23:59:59.000Z
Viscous hydrodynamics is commonly used to model the evolution of the matter created in an ultra-relativistic heavy-ion collision. It provides a good description of transverse momentum spectra and anisotropic flow. These observables, however, cannot be consistently derived using viscous hydrodynamics alone, because they depend on the microscopic interactions at freeze-out. We derive the ideal hydrodynamic limit and the first-order viscous correction to anisotropic flow ($v_2$, $v_3$ and $v_4$) and momentum spectrum using a transport calculation. The linear response coefficient to the initial anisotropy, $v_n(p_T)/\\varepsilon_n$, depends little on $n$ in the ideal hydrodynamic limit. The viscous correction to the spectrum depends not only on the differential cross section, but also on the initial momentum distribution. This dependence is not captured by standard second-order viscous hydrodynamics. The viscous correction to anisotropic flow increases with $p_T$, but this increase is slower than usually assumed i...
Self-regulating flow control device
Humphreys, Duane A. (Pittsburgh, PA)
1984-01-01T23:59:59.000Z
A variable, self-regulating valve having a hydraulic loss coefficient proportional to a positive exponential power of the flow rate. The device includes two objects in a flow channel and structure which assures that the distance between the two objects is an increasing function of the flow rate. The range of spacing between the objects is such that the hydraulic resistance of the valve is an increasing function of the distance between the two objects so that the desired hydraulic loss coefficient as a function of flow rate is obtained without variation in the flow area.
Performance mapping studies in Redox flow cells
Hoberecht, M.A.; Thaller, L.H.
1981-09-01T23:59:59.000Z
Pumping power requirements in any flow battery system constitute a direct parasitic energy loss. It is therefore useful to determine the practical lower limit for reactant flow rates. Through the use of a theoretical framework based on electrochemical first principles, two different experimental flow mapping techniques are developed to evaluate and compare electrodes as a function of flow rate. For the carbon felt electrodes presently used in NASA-Lewis Redox cells, a flow rate 1.5 times greater than the stoichiometric rate seems to be the required minimum.
Chemical preconcentrator with integral thermal flow sensor
Manginell, Ronald P. (Albuquerque, NM); Frye-Mason, Gregory C. (Cedar Crest, NM)
2003-01-01T23:59:59.000Z
A chemical preconcentrator with integral thermal flow sensor can be used to accurately measure fluid flow rate in a microanalytical system. The thermal flow sensor can be operated in either constant temperature or constant power mode and variants thereof. The chemical preconcentrator with integral thermal flow sensor can be fabricated with the same MEMS technology as the rest of the microanlaytical system. Because of its low heat capacity, low-loss, and small size, the chemical preconcentrator with integral thermal flow sensor is fast and efficient enough to be used in battery-powered, portable microanalytical systems.
Hartmann, Ralf
Flows, Error Estimation, Mesh Adaptation PACS: 02.60, 47.27, 47.11.Fg, 47.85.Gj 1. Introduction adaptation and efficient parallelization on modern distributed-memory computer architectures. While first of the European ADIGMA project [3], a coordinated European effort in advancing higher-order dis- cretization
Modeling and applications of two-phase flow distribution in manifolds under microgravity conditions
Young, Cale Hollis
1998-01-01T23:59:59.000Z
calculations for fluids and geometries of interest were performed in order to evaluate the performance of the code and design an experiment for code validation. Only one applicable microgravity two-phase flow experiment exists in the literature, and its results...
APS/123-QED Hydraulic Flow through a Channel Contraction: Multiple Steady States
Al Hanbali, Ahmad
APS/123-QED Hydraulic Flow through a Channel Contraction: Multiple Steady States Benjamin Akers with a complex hydraulic jump in the contraction occurring in a small section of the bc/b0 and Froude number parameter plane. One- dimensional hydraulic theory provides a comprehensive leading-order approximation
APS/123-QED Hydraulic Flow through a Contraction: Multiple Steady States
Al Hanbali, Ahmad
APS/123-QED Hydraulic Flow through a Contraction: Multiple Steady States Benjamin Akers Department states, as well as a steady reservoir with a two-dimensional hydraulic jump in the contraction occur-dimensional hydraulic theory provides a comprehensive leading-order explanation, but quadratic friction is re- quired
Physica D 209 (2005) 245259 On undercompressive shocks in constrained two-layer flows
Kondic, Lou
2005-01-01T23:59:59.000Z
the upper fluid, making this configuration relevant to air-water systems. Flow is driven by an imposed the interfacial shape separating the two fluids and the leading-order pressure. This system includes the physical such as the design and operation of spacecraft environmental systems, storage and transfer of cryogenic fluids
Towards an Integrated BPM Schema: Control Flow Heterogeneity of PNML and BPEL4WS
Zdun, Uwe
Towards an Integrated BPM Schema: Control Flow Heterogeneity of PNML and BPEL4WS Jan Mendling1 to identify extensions to the schema integration process in order to capture such specifics of BPM schemas. 1 Introduction Heterogeneity of Business Process Modelling (BPM) schemas is a notorious prob- lem for business
The structural sensitivity of open shear flows calculated with a local stability analysis
Juniper, Matthew P.; Pier, Benoit
2014-01-01T23:59:59.000Z
calculated with 2D or 3D global stability analyses, which can be very computationally expensive. For weakly non-parallel flows the direct global mode can also be calculated with a local stability analysis, which is orders of magnitude cheaper...
An Evaluation of Data Costs for Optical Flow Christoph Vogel 1
Schindler, Konrad
of the continuous energy minimization framework of [14], i.e. they formulate an energy that aggregates data efficient. Moreover, other algorithmic advances, such as pre-filtering or outlier removal [26], have further- sistent framework, in order to isolate the contribution of the data cost. We focus on global optical flow
Assessing Non-Normal Effects in Thermoacoustic Systems with Mean Flow. K. Wieczorek,1, a)
Nicoud, Franck
Assessing Non-Normal Effects in Thermoacoustic Systems with Mean Flow. K. Wieczorek,1, a) C this paper, non-normal interactions in a thermoacoustic system are studied, using a low-order expansion. INTRODUCTION Over the last decades, thermoacoustic instabilities have been the subject of intense re- search
Multiphase flow and Encapsulation simulations using the moment of fluid method 1
Sussman, Mark
in order to demonstrate its capabilities. Examples are given in 2D, 3D axisymmetric (R-Z), and 3D (X Corporation, for the U. S. Department of Energy's National Nuclear Security Administration under contract DE. Introduction Multiphase flow plays an important role in many technical applications including ink-jet printing
DARCY'S FLOW WITH PRESCRIBED CONTACT ANGLE WELL-POSEDNESS AND LUBRICATION APPROXIMATION
DARCY'S FLOW WITH PRESCRIBED CONTACT ANGLE Â WELL-POSEDNESS AND LUBRICATION APPROXIMATION HANS KN on a solid sub- strate. We use a model for viscous fluids where evolution is governed by Darcy's Law converge to the solutions of a one-dimensional degenerate parabolic fourth order equation which belongs
Vinyasa Flow Awaken your inner warrior! This dynamic flow infuses
-1pm Informal Recreation Open Gym Basketball-6/17-8/14 Gym 147 Monday's and Wednesdays: 12-1pm #12;.sfsu.edu/~recsport Gentle Hatha Yoga 12-1pm (BH6) -Jacalyn Dance-Begins 6/17 12-1pm (Gym 100J) -Mo PIYO® 12-1pm (Gym 149) -Adair 6/10-7/23 Vinyasa Flow 12-1pm (BH6) -Jeff ZUMBA®-Begins 6/18 12-1pm (Gym 100) -Erika- XL Strength
Dynamical Topological Order Parameters far from Equilibrium
Jan Carl Budich; Markus Heyl
2015-09-21T23:59:59.000Z
We report the discovery of a novel topological quantum number, represented by a momentum space winding number of the Pancharatnam geometric phase, that is dynamically defined and can change its integer value at discrete times where so called dynamical quantum phase transitions (DQPTs) occur. By contrast, straightforward non-equilibrium generalizations of conventional topological invariants are well known to be constants of motion under coherent time evolution. DQPTs have been recently introduced as a non-equilibrium analog in quantum real-time evolution of conventional phase transitions, where increasing time replaces the notion of conventional control parameters such as temperature. Here, studying quantum quenches in two-banded Bogoliubov de Gennes models, we identify for the first time a quantity that can be seen as the dynamical analog of an order parameter which changes its topologically quantized value at DQPTs.
Cosmology of modified (but second order) gravity
Tomi S. Koivisto
2009-10-21T23:59:59.000Z
This is a brief review of modified gravity cosmologies. Generically extensions of gravity action involve higher derivative terms, which can result in ghosts and instabilities. There are three ways to circumvent this: Chern-Simons terms, first order variational principle and nonlocality. We consider recent cosmological applications of these three classes of modified gravity models, in particular to the dark energy problem. The viable parameter spaces can be very efficiently constrained by taking into account cosmological data from all epochs in addition to Solar system tests and stability considerations. We make some new remarks concerning so called algebraic scalar-tensor theories, biscalar reformulation of nonlocal actions involving the inverse d'Alembertian, and a possible covariant formulation holographic cosmology with nonperturbative gravity.
Design and construction of an experiment for two-phase flow in fractured porous media
Ayala, R.E.G.; Aziz, K.
1993-08-01T23:59:59.000Z
In numerical reservoir simulation naturally fractured reservoirs are commonly divided into matrix and fracture systems. The high permeability fractures are usually entirely responsible for flow between blocks and flow to the wells. The flow in these fractures is modeled using Darcy`s law and its extension to multiphase flow by means of relative permeabilities. The influence and measurement of fracture relative permeability for two-phase flow in fractured porous media have not been studied extensively, and the few works presented in the literature are contradictory. Experimental and numerical work on two-phase flow in fractured porous media has been initiated. An apparatus for monitoring this type of flow was designed and constructed. It consists of an artificially fractured core inside an epoxy core holder, detailed pressure and effluent monitoring, saturation measurements by means of a CT-scanner and a computerized data acquisition system. The complete apparatus was assembled and tested at conditions similar to the conditions expected for the two-phase flow experiments. Fine grid simulations of the experimental setup-were performed in order to establish experimental conditions and to study the effects of several key variables. These variables include fracture relative permeability and fracture capillary pressure. The numerical computations show that the flow is dominated by capillary imbibition, and that fracture relative permeabilities have only a minor influence. High oil recoveries without water production are achieved due to effective water imbibition from the fracture to the matrix. When imbibition is absent, fracture relative permeabilities affect the flow behavior at early production times.
Gradient Flow of O(N) nonlinear sigma model at large N
Sinya Aoki; Kengo Kikuchi; Tetsuya Onogi
2015-05-03T23:59:59.000Z
We study the gradient flow equation for the O(N) nonlinear sigma model in two dimensions at large N. We parameterize solution of the field at flow time t in powers of bare fields by introducing the coefficient function X_n for the n-th power term (n=1,3,...). Reducing the flow equation by keeping only the contributions at leading order in large N, we obtain a set of equations for X_n's, which can be solved iteratively starting from n=1. For n=1 case, we find an explicit form of the exact solution. Using this solution, we show that the two point function at finite flow time t is finite. As an application, we obtain the non-perturbative running coupling defined from the energy density. We also discuss the solution for n=3 case.
Executive Order -- Preparing the United States for the Impacts...
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President Issues Executive Order Aimed at Preparing for the Impacts...
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President Issues Executive Order Aimed at Preparing for the Impacts of Climate Change; Tribal Leaders to Serve on Task Force President Issues Executive Order Aimed at Preparing for...
FY 2006 Executive Order 13101 Report: Department of Energy Affirmative...
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White House Announces New Executive Order To Reduce Greenhouse...
White House Announces New Executive Order To Reduce Greenhouse Gas Emissions in the Federal Government White House Announces New Executive Order To Reduce Greenhouse Gas Emissions...
Technical Standards, DOE Orders and Applicable CFRs/DEAR Crosswalk...
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New Executive Order Establishes a Federal Flood Risk Management...
New Executive Order Establishes a Federal Flood Risk Management Standard New Executive Order Establishes a Federal Flood Risk Management Standard February 5, 2015 - 10:55am Addthis...
Vacancies Ordered in Screw Form (VOSF) and Layered Indium Selenide...
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Ordered in Screw Form (VOSF) and Layered Indium Selenide Thin Film Deposition by Laser Back Ablation. Vacancies Ordered in Screw Form (VOSF) and Layered Indium Selenide Thin Film...
Orbiting binary black hole evolutions with a multipatch high order finite-difference approach
Pazos, Enrique [Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States); Center for Scientific Computation and Mathematical Modeling, University of Maryland, College Park, Maryland 20742 (United States); Departamento de Matematica, Universidad de San Carlos de Guatemala, Edificio T4, Facultad de Ingenieria, Ciudad Universitaria Z. 12 (Guatemala); Tiglio, Manuel [Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States); Center for Scientific Computation and Mathematical Modeling, University of Maryland, College Park, Maryland 20742 (United States); Duez, Matthew D.; Kidder, Lawrence E.; Teukolsky, Saul A. [Center for Radiophysics and Space Research, Cornell University, Ithaca, New York, 14853 (United States)
2009-07-15T23:59:59.000Z
We present numerical simulations of orbiting black holes for around 12 cycles, using a high order multipatch approach. Unlike some other approaches, the computational speed scales almost perfectly for thousands of processors. Multipatch methods are an alternative to adaptive mesh refinement, with benefits of simplicity and better scaling for improving the resolution in the wave zone. The results presented here pave the way for multipatch evolutions of black hole-neutron star and neutron star-neutron star binaries, where high resolution grids are needed to resolve details of the matter flow.
Potential Flow Calculations of Axisymmetric Ducted Wind Turbines
Widnall, Sheila
2009-09-02T23:59:59.000Z
An incompressible potential-flow vortex method has been constructed to analyze the flow field of a ducted
Jet quenching and elliptic flow
A. K. Chaudhuri
2007-08-29T23:59:59.000Z
In jet quenching, a hard QCD parton, before fragmenting into a jet of hadrons, deposits a fraction of its energy in the medium, leading to suppressed production of high-$p_T$ hadrons. Assuming that the deposited energy quickly thermalizes, we simulate the subsequent hydrodynamic evolution of the QGP fluid. Explicit simulation of Au+Au collision with and without a quenching jet indicate that elliptic flow is greatly reduced in a jet event. The result can be used to identify the jet events in heavy ion collisions.
Flow Phenomena at AGS Energies
J. P. Wessels
1997-04-07T23:59:59.000Z
In this talk some of the latest data on directed sideward, elliptic, radial, and longitudinal flow at AGS energies will be reviewed. A method to identify the reaction plane event by event and the measurement of its resolution will be discussed. The distributions of global observables (transverse energy E_T and charged particle multiplicity N_c), as well as those of identified particles will be shown. Finally, the data will be put in context with measurements at other beam energies. These systematics will then be discussed in terms of possible signatures of the QCD phase transition.
Continuous flow dielectrophoretic particle concentrator
Cummings, Eric B. (Livermore, CA)
2007-04-17T23:59:59.000Z
A continuous-flow filter/concentrator for separating and/or concentrating particles in a fluid is disclosed. The filter is a three-port device an inlet port, an filter port and a concentrate port. The filter separates particles into two streams by the ratio of their dielectrophoretic mobility to their electrokinetic, advective, or diffusive mobility if the dominant transport mechanism is electrokinesis, advection, or diffusion, respectively.Also disclosed is a device for separating and/or concentrating particles by dielectrophoretic trapping of the particles.
Supercritical flow in rectangular expansions
Walsh, Peter.
1968-01-01T23:59:59.000Z
SUPERCRITICAL FLOW IN RECTANGULAR EXPANSIONS A Thesis By PETER WALSH Submitted to the Graduate College of the Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Augu st I 9 68 Major Subject... and actual center line profiles for velocity of 5. 8 ft. /sec, slope l. 3%, angle of expansion . 1 radian. 51 19. Comparison of predicted and actual center line profiles for velocity of 3. 8 ft. /sec, slope 5%, angle of expansion . 1 radian. 52 20...
A new precision flow calorimeter
Johnson, Mark Gezer
1984-01-01T23:59:59.000Z
. THE REFERENCE FLUID CIRCUIT (The Thermo-Syphon System) 2. THE SAMPLE FLUID CIRCUIT 11 17 CALORIMETER AUXILIARY EQUIPMENT 1. BAYONET SYSTEM 2. MATCHING HEATER 3. PRESSURE TRANSDUCER 4. VACUUM SYSTEM 5. MAGNETIC STIRRER 6. METERING PUMP 20 25 25 31... Circuit (Thermo-Syphon System) Detail 12 4 A Typical Cycle of Thermo-Syphon System on a PT Diagram of Freon&-11 13 5 The Reference Fluid Circuit Simplified 14 6 The Sample Fluid Flow System 7 Calorimeter Detail 21 8 Bayonet System Detail 9 Copper...
DYNAMIC MODELING STRATEGY FOR FLOW REGIME TRANSITION IN GAS-LIQUID TWO-PHASE FLOWS
X. Wang; X. Sun; H. Zhao
2011-09-01T23:59:59.000Z
In modeling gas-liquid two-phase flows, the concept of flow regime has been used to characterize the global interfacial structure of the flows. Nearly all constitutive relations that provide closures to the interfacial transfers in two-phase flow models, such as the two-fluid model, are often flow regime dependent. Currently, the determination of the flow regimes is primarily based on flow regime maps or transition criteria, which are developed for steady-state, fully-developed flows and widely applied in nuclear reactor system safety analysis codes, such as RELAP5. As two-phase flows are observed to be dynamic in nature (fully-developed two-phase flows generally do not exist in real applications), it is of importance to model the flow regime transition dynamically for more accurate predictions of two-phase flows. The present work aims to develop a dynamic modeling strategy for determining flow regimes in gas-liquid two-phase flows through the introduction of interfacial area transport equations (IATEs) within the framework of a two-fluid model. The IATE is a transport equation that models the interfacial area concentration by considering the creation and destruction of the interfacial area, such as the fluid particle (bubble or liquid droplet) disintegration, boiling and evaporation; and fluid particle coalescence and condensation, respectively. For the flow regimes beyond bubbly flows, a two-group IATE has been proposed, in which bubbles are divided into two groups based on their size and shape (which are correlated), namely small bubbles and large bubbles. A preliminary approach to dynamically identifying the flow regimes is provided, in which discriminators are based on the predicted information, such as the void fraction and interfacial area concentration of small bubble and large bubble groups. This method is expected to be applied to computer codes to improve their predictive capabilities of gas-liquid two-phase flows, in particular for the applications in which flow regime transition occurs.
Gering, Jon C.
TRUMAN LOGO NAME BADGE ORDER FORM To place an order for Truman Logo name badges, please complete-mailed list. Price includes 2-color Truman State University logo badge, up to three lines of engraving (36
Order Module--DOE Order 422.1, CONDUCT OF OPERATIONS | Department of Energy
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a g e OctoberEnergy FormerSitesof Energy Financing forWebinar |Order Module--DOE Order 422.1,
INVARIANTS OF TWISTWISE FLOW EQUIVALENCE MICHAEL C. SULLIVAN
Sullivan, Michael
equivalent suspension flows. The suspension flow is a onedimension flow obtained by taking the cross product an example. The map is just the horseshoe map. A piece of an orbit of a suspension flow is shown. The sectionINVARIANTS OF TWISTWISE FLOW EQUIVALENCE MICHAEL C. SULLIVAN Abstract. Flow equivalence
A constitutive law for dense granular flows
Pierre Jop; Yoël Forterre; Olivier Pouliquen
2006-12-05T23:59:59.000Z
A continuum description of granular flows would be of considerable help in predicting natural geophysical hazards or in designing industrial processes. However, the constitutive equations for dry granular flows, which govern how the material moves under shear, are still a matter of debate. One difficulty is that grains can behave like a solid (in a sand pile), a liquid (when poured from a silo) or a gas (when strongly agitated). For the two extreme regimes, constitutive equations have been proposed based on kinetic theory for collisional rapid flows, and soil mechanics for slow plastic flows. However, the intermediate dense regime, where the granular material flows like a liquid, still lacks a unified view and has motivated many studies over the past decade. The main characteristics of granular liquids are: a yield criterion (a critical shear stress below which flow is not possible) and a complex dependence on shear rate when flowing. In this sense, granular matter shares similarities with classical visco-plastic fluids such as Bingham fluids. Here we propose a new constitutive relation for dense granular flows, inspired by this analogy and recent numerical and experimental work. We then test our three-dimensional (3D) model through experiments on granular flows on a pile between rough sidewalls, in which a complex 3D flow pattern develops. We show that, without any fitting parameter, the model gives quantitative predictions for the flow shape and velocity profiles. Our results support the idea that a simple visco-plastic approach can quantitatively capture granular flow properties, and could serve as a basic tool for modelling more complex flows in geophysical or industrial applications.
Zonal flow dynamics in the double tearing mode with antisymmetric shear flows
Mao, Aohua [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China) [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China); Graduate School of Energy Science, Kyoto University, Uji, Kyoto 6110011 (Japan); Li, Jiquan, E-mail: lijq@energy.kyoto-u.ac.jp [Graduate School of Energy Science, Kyoto University, Uji, Kyoto 6110011 (Japan)] [Graduate School of Energy Science, Kyoto University, Uji, Kyoto 6110011 (Japan); Liu, Jinyuan, E-mail: jyliu@dlut.edu.cn [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)] [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China); Kishimoto, Yasuaki [Graduate School of Energy Science, Kyoto University, Uji, Kyoto 6110011 (Japan) [Graduate School of Energy Science, Kyoto University, Uji, Kyoto 6110011 (Japan); Institude of Advanced Energy, Kyoto University, Uji, Kyoto 6110011 (Japan)
2014-05-15T23:59:59.000Z
The generation dynamics and the structural characteristics of zonal flows are investigated in the double tearing mode (DTM) with antisymmetric shear flows. Two kinds of zonal flow oscillations are revealed based on reduced resistive magnetohydrodynamics simulations, which depend on the shear flow amplitudes corresponding to different DTM eigen mode states, elaborated by Mao et al. [Phys. Plasmas 20, 022114 (2013)]. For the weak shear flows below an amplitude threshold, v{sub c}, at which two DTM eigen states with antisymmetric or symmetric magnetic island structure are degenerated, the zonal flows grow oscillatorily in the Rutherford regime during the nonlinear evolution of the DTMs. It is identified that the oscillation mechanism results from the nonlinear interaction between the distorted islands and the zonal flows through the modification of shear flows. However, for the medium shear flows above v{sub c} but below the critical threshold of the Kelvin-Helmholtz instability, an oscillatory growing zonal flow occurs in the linear phase of the DTM evolution. It is demonstrated that the zonal flow oscillation originates from the three-wave mode coupling or a modulation instability pumped by two DTM eigen modes with the same frequency but opposite propagating direction. With the shear flows increasing, the amplitude of zonal flow oscillation increases first and then decreases, whilst the oscillation frequency as twice of the Doppler frequency shift increases. Furthermore, impacts of the oscillatory zonal flows on the nonlinear evolution of DTM islands and the global reconnection are also discussed briefly.
Chen, LW; Ko, Che Ming; Lin, ZW.
2004-01-01T23:59:59.000Z
. Nucl. Part. Sci. 47, 663 (1997). [2] J. Barrette et al., E877 Collaboration, Phys. Rev. Lett. 73, 2532 (1994). [3] H. Appelshauser et al., NA49 Collaboration, Phys. Rev. Lett. 80, 4136 (1998). [4] J. Y. Ollitrault, Phys. Rev. D 46, 229 (1992). [5...] H. Sorge, Phys. Lett. B 402, 251 (1997); Phys. Rev. Lett. 78, 2309 (1997); 82, 2048 (1999). [6] P. Danielewicz, R. A. Lacey, P. B. Gossiaux, C. Pinkenburg, P. Chung, J. M. Alexander, and R. L. McGrath, Phys. Rev. Lett. 81, 2438 (1998). [7] B...
Kohley, Zachary Wayne
2011-10-21T23:59:59.000Z
1. Coulomb Trajectory . . . . . . . . . . . . . . . . . . . 188 2. Classical Molecular Dynamics (CMD) . . . . . . . . . 191 3. Antisymmetrized Molecular Dynamics (AMD) . . . . 193 4. Constrained Molecular Dynamics (CoMD) . . . . . . . 197 5... from the Coulomb trajectory calculations in which the initial dis- tance of the PLF and TLF was 25 fm from the mid-rapidity par- ticle. The initial position of the PLF (TLF) is shown as the black filled (open) circles and the solid black lines...
Triple-decker: Interfacing atomistic-mesoscopic-continuum flow regimes
Fedosov, Dmitry A. [Division of Applied Mathematics, Brown University, 182 George St., Box F, Providence, RI 02912 (United States); Karniadakis, George Em [Division of Applied Mathematics, Brown University, 182 George St., Box F, Providence, RI 02912 (United States)], E-mail: gk@dam.brown.edu
2009-03-01T23:59:59.000Z
Multiscale flow phenomena in microfluidic and biomedical applications require the use of heterogeneous modeling approaches. In this paper we present a hybrid method based on coupling the Molecular Dynamics (MD) method, the Dissipative Particle Dynamics (DPD) method, and the incompressible Navier-Stokes (NS) equations. MD, DPD, and NS are formulated in separate subdomains and are coupled via an overlapping region by communicating state information at the subdomain boundaries. Imposition of boundary conditions in the MD and DPD systems involves particle insertion and deletion, specular wall reflection and body force terms. The latter includes a boundary pressure force in order to minimize near-boundary density fluctuations, and an adaptive shear force which enforces the tangential velocity component of boundary conditions. The triple-decker algorithm is verified for prototype flows, including simple and multi-layer fluids (Couette, Poiseuille, and lid-driven cavity), using highly accurate reference solutions. A zero-thickness interface is also possible if it is aligned with the flow streamlines.
Spatial and temporal resolution of fluid flows: LDRD final report
Tieszen, S.R.; O`Hern, T.J.; Schefer, R.W.; Perea, L.D.
1998-02-01T23:59:59.000Z
This report describes a Laboratory Directed Research and Development (LDRD) activity to develop a diagnostic technique for simultaneous temporal and spatial resolution of fluid flows. The goal is to obtain two orders of magnitude resolution in two spatial dimensions and time simultaneously. The approach used in this study is to scale up Particle Image Velocimetry (PIV) and Planar Laser Induced Fluorescence (PLIF) to acquire meter-size images at up to 200 frames/sec. Experiments were conducted in buoyant, fully turbulent, non-reacting and reacting plumes with a base diameter of one meter. The PIV results were successful in the ambient gas for all flows, and in the plume for non-reacting helium and reacting methane, but not reacting hydrogen. No PIV was obtained in the hot combustion product region as the seed particles chosen vaporized. Weak signals prevented PLIF in the helium. However, in reacting methane flows, PLIF images speculated to be from Poly-Aromatic-Hydrocarbons were obtained which mark the flame sheets. The results were unexpected and very insightful. A natural fluorescence from the seed particle vapor was also noted in the hydrogen tests.
Flow of suspensions in pipelines
Nasr-El-Din, H.A. [Laboratory R& D Center, Saudi Aramco, Dhahran (Saudi Arabia)
1996-12-31T23:59:59.000Z
Slurry pipelines are used in many industrial applications. Several parameters are often needed by the operator, including critical deposit velocity, solids concentration, and particle velocity profiles. This chapter first reviews important formulas used to predict critical deposit velocity both in Newtonian and non-Newtonian (power-law) carrier fluids. Various methods to measure local velocity and solids concentration profiles in slurry pipelines are discussed. Local solids concentration can be measured by sample withdrawal technique. However, the sample should be withdrawn at isokinetic conditions. Sampling downstream of tees and elbows can result in significant errors in measuring solids concentration. Gamma-ray absorption methods can be used; however, two scans are needed to obtain local solids concentration. Bulk velocity of conductive slurries can be obtained using magnetic flow meters mounted on a vertical section of the pipe. Local particle velocity can be obtained using conductivity probes. NMR methods can be used to measure concentration and particle velocity profiles but are limited to small-diameter pipes. Vertical solids concentration of coarse slurries flowing in a horizontal pipeline exhibits a positive gradient near the bottom of the pipe. Traditional models to predict these profiles are given, and new mathematical models and computer software to determine these profiles are introduced. 104 refs., 31 figs., 1 tab.
Executive Order 13423: Strengthening Federal Environmental, Energy, and Transportation Management
Office of Energy Efficiency and Renewable Energy (EERE)
Full text of Executive Order 13423: Strengthening Federal Environmental, Energy, and Transportation Management.
Gradual Variation Analysis for Groundwater Flow
Chen, Li
2010-01-01T23:59:59.000Z
Groundwater flow in Washington DC greatly influences the surface water quality in urban areas. The current methods of flow estimation, based on Darcy's Law and the groundwater flow equation, can be described by the diffusion equation (the transient flow) and the Laplace equation (the steady-state flow). The Laplace equation is a simplification of the diffusion equation under the condition that the aquifer has a recharging boundary. The practical way of calculation is to use numerical methods to solve these equations. The most popular system is called MODFLOW, which was developed by USGS. MODFLOW is based on the finite-difference method in rectangular Cartesian coordinates. MODFLOW can be viewed as a "quasi 3D" simulation since it only deals with the vertical average (no z-direction derivative). Flow calculations between the 2D horizontal layers use the concept of leakage. In this project, we have established a mathematical model based on gradually varied functions for groundwater data volume reconstruction. T...
Multicommodity Flows and Cuts in Polymatroidal Networks
Chekuri, Chandra; Raja, Adnan; Viswanath, Pramod
2011-01-01T23:59:59.000Z
We consider multicommodity flow and cut problems in {\\em polymatroidal} networks where there are submodular capacity constraints on the edges incident to a node. Polymatroidal networks were introduced by Lawler and Martel and Hassin in the single-commodity setting and are closely related to the submodular flow model of Edmonds and Giles; the well-known maxflow-mincut theorem holds in this more general setting. Polymatroidal networks for the multicommodity case have not, as far as the authors are aware, been previously explored. Our work is primarily motivated by applications to information flow in wireless networks. We also consider the notion of undirected polymatroidal networks and observe that they provide a natural way to generalize flows and cuts in edge and node capacitated undirected networks. We establish poly-logarithmic flow-cut gap results in several scenarios that have been previously considered in the standard network flow models where capacities are on the edges or nodes. Our results have alread...
CFD analysis of laminar oscillating flows
Booten, C. W. Charles W.); Konecni, S. (Snezana); Smith, B. L. (Barton L.); Martin, R. A. (Richard A.)
2001-01-01T23:59:59.000Z
This paper describes a numerical simulations of oscillating flow in a constricted duct and compares the results with experimental and theoretical data. The numerical simulations were performed using the computational fluid dynamics (CFD) code CFX4.2. The numerical model simulates an experimental oscillating flow facility that was designed to test the properties and characteristics of oscillating flow in tapered ducts, also known as jet pumps. Jet pumps are useful devices in thermoacoustic machinery because they produce a secondary pressure that can counteract an unwanted effect called streaming, and significantly enhance engine efficiency. The simulations revealed that CFX could accurately model velocity, shear stress and pressure variations in laminar oscillating flow. The numerical results were compared to experimental data and theoretical predictions with varying success. The least accurate numerical results were obtained when laminar flow approached transition to turbulent flow.
Berejnov, Viatcheslav; Sinton, David; Djilali, Ned
2009-01-01T23:59:59.000Z
Experimental two-phase invasion percolation flow patterns were observed in hydrophobic micro-porous networks designed to model fuel cell specific porous media. In order to mimic the operational conditions encountered in the porous electrodes of polymer electrolyte membrane fuel cells (PEMFCs), micro-porous networks were fabricated with corresponding microchannel size distributions. The inlet channels were invaded homogeneously with flow rates corresponding to fuel cell current densities of 1.0 to 0.1 A/cm2 (Ca 10e-7-10e-8). A variety of fractal breakthrough patterns were observed and analyzed to quantify flooding density and geometrical diversity in terms of the total saturation, St, local saturations, s, and fractal dimension, D. It was found that St increases monotonically during the invasion process until the breakthrough point is reached, and s profiles indicate the dynamic distribution of the liquid phase during the process. Fractal analysis confirmed that the experiments fall within the flow regime of i...
Oosterhuis, Joris P; Wilcox, Douglas; van der Meer, Theo
2015-01-01T23:59:59.000Z
A two-dimensional computational fluid dynamics model is used to predict the oscillatory flow through a tapered cylindrical tube section (jet pump) placed in a larger outer tube. Due to the shape of the jet pump, there will exist an asymmetry in the hydrodynamic end effects which will cause a time-averaged pressure drop to occur that can be used to cancel Gedeon streaming in a closed-loop thermoacoustic device. The performance of two jet pump geometries with different taper angles is investigated. A specific time-domain impedance boundary condition is implemented in order to simulate traveling acoustic wave conditions. It is shown that by scaling the acoustic displacement amplitude to the jet pump dimensions, similar minor losses are observed independent of the jet pump geometry. Four different flow regimes are distinguished and the observed flow phenomena are related to the jet pump performance. The simulated jet pump performance is compared to an existing quasi-steady approximation which is shown to only be ...
Mare, Thierry; Voicu, Ionut; Miriel, Jacques [Laboratoire de Genie Civil et de Genie Mecanique (LGCGM), INSA de Rennes, IUT Saint Malo, 35043 Rennes (France); Galanis, Nicolas [Faculte de genie, Universite de Sherbrooke, Sherbrooke, QC (Canada); Sow, Ousmane [Laboratoire d'Energie Appliquee, Ecole superieure Polytechnique, Dakar (Senegal)
2008-04-15T23:59:59.000Z
Velocity vectors in a vertical coaxial double-duct heat exchanger for parallel ascending flow of water under conditions of laminar mixed convection have been determined experimentally using the particle image velocimetry technique. The measured velocity distributions for large annular flow rates, resulting in an essentially isothermal environment for the stream in the inner tube, are in very good agreement with corresponding numerical predictions. For flow rates of the same order of magnitude in the inner tube and the annulus, and corresponding temperature differences of about 20 C, experimental observations show that flow reversal occurs simultaneously in both streams over large axial distances for both heating and cooling of the flow in the inner tube. (author)
Flow distribution analysis on the cooling tube network of ITER thermal shield
Nam, Kwanwoo; Chung, Wooho; Noh, Chang Hyun; Kang, Dong Kwon; Kang, Kyoung-O; Ahn, Hee Jae; Lee, Hyeon Gon [ITER Korea, National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)
2014-01-29T23:59:59.000Z
Thermal shield (TS) is to be installed between the vacuum vessel or the cryostat and the magnets in ITER tokamak to reduce the thermal radiation load to the magnets operating at 4.2K. The TS is cooled by pressurized helium gas at the inlet temperature of 80K. The cooling tube is welded on the TS panel surface and the composed flow network of the TS cooling tubes is complex. The flow rate in each panel should be matched to the thermal design value for effective radiation shielding. This paper presents one dimensional analysis on the flow distribution of cooling tube network for the ITER TS. The hydraulic cooling tube network is modeled by an electrical analogy. Only the cooling tube on the TS surface and its connecting pipe from the manifold are considered in the analysis model. Considering the frictional factor and the local loss in the cooling tube, the hydraulic resistance is expressed as a linear function with respect to mass flow rate. Sub-circuits in the TS are analyzed separately because each circuit is controlled by its own control valve independently. It is found that flow rates in some panels are insufficient compared with the design values. In order to improve the flow distribution, two kinds of design modifications are proposed. The first one is to connect the tubes of the adjacent panels. This will increase the resistance of the tube on the panel where the flow rate is excessive. The other design suggestion is that an orifice is installed at the exit of tube routing where the flow rate is to be reduced. The analysis for the design suggestions shows that the flow mal-distribution is improved significantly.
Islands in the stream: The effect of plasma flow on tearing stability
La Haye, R. J.; Buttery, R. J. [General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States); Brennan, D. P. [University of Tulsa, Tulsa, Oklahoma 74104 (United States); Gerhardt, S. P. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540 (United States)
2010-05-15T23:59:59.000Z
Reducing plasma flow clearly decreases the stability of tearing modes in multiple regimes (sawtooth, hybrid) in both high- and low-aspect-ratio tokamaks (DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)], Joint European Torus [M. Keilhacker and the JET Team, Plasma Phys. Controlled Fusion 41, 301 (1999)], National Spherical Torus Experiment [M. Ono, S. M. Kaye, Y.-K. M. Peng, Nucl. Fusion 40, 557 (2000)], each with distinct means of lessening rotation). Further, reducing flow makes pre-existing 'saturated' islands larger at the same beta (beta). Thus lower plasma flow impairs high-beta operation owing both to the destabilization and to the impact of tearing-mode islands. Experimental results suggest that flow shear (not flow) at the tearing rational surface is classically stabilizing, making the effective tearing stability index DELTA{sup '} of the total current density profile more negative (more stable). In this picture, with profiles and all else the same, the minimum metastable beta at which neoclassical tearing modes (NTMs) can destabilize is proportional to -DELTA{sup '} and hence lower flow and flow shear lead to possible destabilization (depending on seeding) at lower beta. Similarly, if destabilized, the saturated NTM island width is proportional to -beta/DELTA{sup '} and thus increases as flow and flow shear are reduced. A working model gives a significant level of stabilizing shear if the plasma toroidal angular flow shear -dOMEGA{sub p}hi/dr at a given rational surface is of order of the inverse of the product of the local values of the parallel magnetic shear length L{sub s} and the Alfven time tau{sub A}. Experimental data are fitted for the effect of this normalization of flow shear in a simple empirical model for both onset and saturation of tearing modes. Most theoretical literature is on the consequence of flow shear on tearing stability at zero beta; tokamaks at high beta have large magnetic Prandtl number (an issue for the sign of the flow effect) and very large Lundquist number. It is in this regime that theory will be compared with experimentally based empirical models. The consequence for future tokamaks with low rotation may be lower tearing stability than now expected.
Nonlinear dynamics of Kelvin-Helmholtz instability in a finite-width plasma flow
Shevelev, M. M.; Burinskaya, T. M., E-mail: tburinsk@iki.rssi.ru [Russian Academy of Sciences, Space Research Institute (Russian Federation)
2013-06-15T23:59:59.000Z
The nonlinear stage of Kelvin-Helmholtz (KH) instability in a finite-width plane-parallel plasma flow is analyzed. The analysis is performed by means of two-dimensional numerical simulations with the use of ideal magnetohydrodynamic equations describing isothermal plasma flows propagating along the magnetic field. The influence of the magnetic field strength, the plasma temperature, and the ratio of the flow width to the width of the transition layer on the formation of vortex layers and large-scale flow perturbations is investigated. It is shown that, if the wavelength of periodic perturbations is shorter than the flow width, the symmetric and antisymmetric modes develop in a qualitatively similar manner. For waves with wavelengths longer than the flow width, the development of such modes is very different due to the mutual influence of the flow boundaries. Analysis of the development of instability at different values of the Alfven Mach number M{sub A} shows that long-lived vortices with a characteristic scale length on the order of the flow width appear in a weak magnetic field for both symmetric and antisymmetric modes; however, the vortex geometries for these modes are different. In a strong magnetic field, M{sub A} {approx} 5, the phase of vortex decay for both types of modes occurs faster than in a weak field; however, in the case of an antisymmetric mode, large-scale perturbations of the flow boundary are retained for a longer time. Analysis of the evolution of the initial disturbance produced by an ensemble of random small perturbations (noise) at different plasma temperatures shows that, for a flow width comparable with the width of the transition region, the development of KH instability is always antisymmetric in character and leads to well-developed large-scale perturbations of the flow as a whole. For a cold plasma with C{sub S} < 0.5U (where C{sub S} is the speed of sound and U is the flow velocity), in contrast to hot plasma with C{sub S} > 0.5U, the development of KH instability leads to the growth of the antisymmetric mode even if the flow width is much larger than the width of the transition region.
Flow of wet granular materials: a numerical study
Saeed Khamseh; Jean-Noël Roux; François Chevoir
2015-04-15T23:59:59.000Z
We simulate dense assemblies of frictional spherical grains in steady shear flow under controlled normal stress $P$ in the presence of a small amount of an interstitial liquid, which gives rise to capillary menisci, assumed isolated (pendular regime), and to attractive forces. The system behavior depends on two dimensionless control parameters: inertial number $I$ and reduced pressure $P^*=aP/(\\pi\\Gamma)$, comparing confining forces $\\sim a^2P$ to meniscus tensile strength $F_0=\\pi\\Gamma a$, for grains of diameter $a$ joined by menisci with surface tension $\\Gamma$. We pay special attention to the quasi-static limit of slow flow and observe systematic, enduring strain localization in some of the cohesion-dominated ($P^*\\sim 0.1$) systems. Homogeneous steady flows are characterized by the dependence of internal friction coefficient $\\mu^*$ and solid fraction $\\Phi$ on $I$ and $P^*$. We record fairly small but not negligible normal stress differences and the moderate sensitivity of the system to saturation within the pendular regime. Capillary forces have a significant effect on the macroscopic behavior of the system, up to $P^*$ values of several units. The concept of effective pressure may be used to predict an order of magnitude for the strong increase of $\\mu^*$ as $P^*$ decreases but such a crude approach is unable to account for the complex structural changes induced by capillary cohesion. Likewise, the Mohr-Coulomb criterion for pressure-dependent critical states is, at best, an approximation valid within a restricted range of pressures, with $P^*\\ge 1$. At small enough $P^*$, large clusters of interacting grains form in slow flows, in which liquid bonds survive shear strains of several units. This affects the anisotropies associated to different interactions, and the shape of function $\\mu^*(I)$, which departs more slowly from its quasistatic limit than in cohesionless systems.