Order Acceptance and Scheduling Problem in Two-machine Flow ...
Rasul Esmaeilbeigi
2014-07-29T23:59:59.000Z
Jul 29, 2014 ... Order Acceptance and Scheduling Problem in Two-machine Flow Shops: New Mixed Integer Programming Formulations.
second-order convex splitting schemes for gradient flows with ...
2011-11-08T23:59:59.000Z
Abstract. We construct unconditionally stable, unconditionally uniquely solvable, and second-order accurate (in time) schemes for gradient flows with energy of ...
Second-order Schemes for Steady Weakly Compressible Liquid Flows
Grant, P. W.
]. Under such circumstances, the speed of sound is much larger than the velocity of the liquid, resulting-differences, such flows may display compressibility effects. Mach number, the ratio of fluid velocity to speed of sound1 Second-order Schemes for Steady Weakly Compressible Liquid Flows I. J. Keshtiban , F. Belblidia
Phenomenological model for ordered onions under shear flow
Kenta Odagiri; Kazue Kudo
2011-09-02T23:59:59.000Z
We propose a phenomenological model for the multi-lamellar vesicles (onions) formation induced by shear flow. In a nonionic surfactant (C$_{12}$E$_4$) system, onion phases under a fixed shear flow within a certain range show the order-disorder transition accompanied with a size jump by changing temperature. Our model can simulate ordered and disordered onion phases with different onion sizes. We show numerical results of the onion formation simulated by the model and also discuss what factors in this system are critical to cause the transition between these two different onion phases.
Physics-Based, Reduced-Order Combustor Flow Modeling Sean D. Bradshaw
Peraire, Jaime
Physics-Based, Reduced-Order Combustor Flow Modeling by Sean D. Bradshaw B.S., Aeronautics-Based, Reduced-Order Combustor Flow Modeling by Sean D. Bradshaw Submitted to the Department of Aeronautics in Aeronautics And Astronautics Abstract A physics-based, reduced-order combustor flow model, CFLOW, is described
Order Acceptance and Scheduling Problem in Two-machine Flow ...
2014-07-30T23:59:59.000Z
Jul 30, 2014 ... Many manufacturing companies use Make-To-Order (MTO) production systems. .... complexity and the number of disjunctive constraints (meaning those with a big M ..... Therefore, setting xiq = 0 does not make the objective.
Hypersonic 3-D Blunt Body Equilibrium Air Flow Using High Order WENO Schemes II
Zha, Gecheng
Hypersonic 3-D Blunt Body Equilibrium Air Flow Using High Order WENO Schemes II Jaejin Lee , Manuel of Mach 12, 3D, hypersonic turbulent flows of air around blunt bodies with applied magnetic fields Hypersonic vehicles generate shocks that can heat the air sufficiently to partially ionize the air and create
Low Magnetic Reynolds Number Hypersonic MHD Flow Using High Order WENO Schemes
Zha, Gecheng
Low Magnetic Reynolds Number Hypersonic MHD Flow Using High Order WENO Schemes Jaejin Lee , Manuel diffusion scheme for 3D Navier-Stokes equa- tions. We present results for hypersonic laminar flows around. I. Introduction Hypersonic vehicles generate shocks that can heat the air sufficiently to partially
Low Rem 3D MHD Hypersonic Equilibrium Flow Using High Order WENO Schemes
Zha, Gecheng
Low Rem 3D MHD Hypersonic Equilibrium Flow Using High Order WENO Schemes Jaejin Lee , Manuel A. Huerta , and Gecheng Zha University of Miami Coral Gables, Florida 33124 We present work on 3D hypersonic our work beyond the results presented in our previous paper, Lee, Huerta, and Zha.2 Hypersonic
MatrixFree SecondOrder Methods in Implicit Time Integration for Compressible Flows Using
as a design tool reducing the number of expensive wind tunnel experiments. The threeÂdimensional simulation of the flow field around an aircraft requires accurate and e#cient numerical methods in order to resolve all of highÂcapacity aircraft in transonic conditions, such as deformation of airplane wings and wake vortices
Matrix-Free Second-Order Methods in Implicit Time Integration for Compressible Flows Using
as a design tool reducing the number of expensive wind tunnel experiments. The three-dimensional simulation of the flow field around an aircraft requires accurate and efficient numerical methods in order to resolve all of high-capacity aircraft in transonic conditions, such as deformation of airplane wings and wake vortices
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),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the ContributionsArms Control R&DNuclear fuelOPTICS FOR A PHOTOINJECTEDthe 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.
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
Moortgat, Joachim, E-mail: jmoortgat@rerinst.org; Firoozabadi, Abbas, E-mail: abbas.firoozabadi@yale.edu
2013-10-01T23:59:59.000Z
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 discontinuities in phase properties at the matrix-fracture interfaces and at phase boundaries. In this work, we account for gravity and Fickian diffusion. The modeling of capillary effects is discussed in a separate paper. We present the mathematical framework, using the implicit-pressure-explicit-composition (IMPEC) scheme, which facilitates rigorous thermodynamic stability analyses and the computation of phase behavior effects to account for transfer of species between the phases. A deceptively simple CFL condition is implemented to improve numerical stability and accuracy. We provide six numerical examples at both small and larger scales and in two and three dimensions, to demonstrate powerful features of the formulation.
Shang, Yu; Lin, Yu; Yu, Guoqiang, E-mail: guoqiang.yu@uky.edu [Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky 40506 (United States); Li, Ting [Department of Biomedical Engineering, University of Kentucky, Lexington, Kentucky 40506 (United States); State Key Laboratory for Electronic Thin Film and Integrated Device, University of Electronic Science and Technology of China, Chengdu 610054 (China); Chen, Lei; Toborek, Michal [Department of Neurosurgery, University of Kentucky, Lexington, Kentucky 40536 (United States)
2014-05-12T23:59:59.000Z
Conventional semi-infinite solution for extracting blood flow index (BFI) from diffuse correlation spectroscopy (DCS) measurements may cause errors in estimation of BFI (?D{sub B}) in tissues with small volume and large curvature. We proposed an algorithm integrating Nth-order linear model of autocorrelation function with the Monte Carlo simulation of photon migrations in tissue for the extraction of ?D{sub B}. The volume and geometry of the measured tissue were incorporated in the Monte Carlo simulation, which overcome the semi-infinite restrictions. The algorithm was tested using computer simulations on four tissue models with varied volumes/geometries and applied on an in vivo stroke model of mouse. Computer simulations shows that the high-order (N???5) linear algorithm was more accurate in extracting ?D{sub B} (errors?order linear algorithm shows the potential for the inter-subject comparison and longitudinal monitoring of absolute BFI in a variety of tissues/organs with different volumes/geometries.
Mittal, Rajat
generation and propagation in such complex geometries is a challenging proposition. Although sound wave of compressible conservation equations (see [10,11]). Computation of sound wave generation/propagation requiresA high-order immersed boundary method for acoustic wave scattering and low-Mach number flow
Kohley, Zachary Wayne
2011-10-21T23:59:59.000Z
. The distributions are shown for using 3 (Top), 4 (Middle), and 5 (Bottom) total bins. . . . . . . . 100 42 Same as Figure 41, except results are from the CoMD simulation. . . 101 43 Average in-plane momentum, ?Px/A?, for protons as a function of the reduced... was applied (stars). The CoMD 600 fm/c + Gemini results are shown as solid squares on the right side of the plot for comparison. . 143 66 Flow parameter for protons and alpha particles is shown as a func- tion of time from the AMD simulation. The flow...
Elliptic flow phenomenon at ATLAS
Martin Spousta
2014-06-20T23:59:59.000Z
We summarize measurements of elliptic flow and higher order flow harmonics performed by the ATLAS experiment at the LHC. Results on event-averaged flow measurements and event-plane correlations in Pb+Pb collisions are discussed along with the event-by-event flow measurements. Further, we summarize results on flow in p+Pb collisions.
Ali Ulas Ozgur Kisisel; Ozgur Sarioglu; Bayram Tekin
2008-06-17T23:59:59.000Z
Using the conformally invariant Cotton tensor, we define a geometric flow, the "Cotton flow", which is exclusive to three dimensions. This flow tends to evolve the initial metrics into conformally flat ones, and is somewhat orthogonal to the Yamabe flow, the latter being a flow within a conformal class. We define an entropy functional, and study the flow of nine homogeneous spaces both numerically and analytically. In particular, we show that the arbitrarily deformed homogeneous 3-sphere flows into the round 3-sphere. Two of the nine homogeneous geometries, which are degenerated by the Ricci flow, are left intact by the Cotton flow.
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'Surplus in the Domestic Oil Market . . . . . . . . . . . . . . . . . . . . . . . . . . 35 APPENDIX B: Data Sources
Evaluation of flow hood measurements for residential register flows
Walker, I.S.; Wray, C.P.; Dickerhoff, D.J.; Sherman, M.H.
2001-09-01T23:59:59.000Z
Flow measurement at residential registers using flow hoods is becoming more common. These measurements are used to determine if the HVAC system is providing adequate comfort, appropriate flow over heat exchangers and in estimates of system energy losses. These HVAC system performance metrics are determined by using register measurements to find out if individual rooms are getting the correct airflow, and in estimates of total air handler flow and duct air leakage. The work discussed in this paper shows that commercially available flow hoods are poor at measuring flows in residential systems. There is also evidence in this and other studies that flow hoods can have significant errors even when used on the non-residential systems they were originally developed for. The measurement uncertainties arise from poor calibrations and the sensitivity of exiting flow hoods to non-uniformity of flows entering the device. The errors are usually large--on the order of 20% of measured flow, which is unacceptably high for most applications. Active flow hoods that have flow measurement devices that are insensitive to the entering airflow pattern were found to be clearly superior to commercially available flow hoods. In addition, it is clear that current calibration procedures for flow hoods may not take into account any field application problems and a new flow hood measurement standard should be developed to address this issue.
Solving the viscous hydrodynamics order by order
Jian-Hua Gao; Shi Pu
2014-09-02T23:59:59.000Z
In this paper, we propose a method of solving the viscous hydrodynamics order by order in a derivative expansion. In such method, the zero order solution is just the one of the ideal hydrodynamics. All the other higher order corrections satisfy the same first-order partial differential equations but with different inhomogeneous terms. We therefore argue that our method could be easily extended to any orders. The problem of causality and stability will be released if the gradient expansion is guaranteed. This method might be of great help to both theoretical and numerical calculations of relativistic hydrodynamics.
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...
Publications Order Form Order by Mail
Borenstein, Elhanan
and Improving Nutrition and Growth of Western Forests Global Resources and Markets: Issues and Trends Mineral.00 $10.50 $5.00 $10.00 $35.00 $20.00 Quantity Total books Total $ $ $ $ $ $ $ $ $ $ $ $ $ $ Total Cost Washington State residents add sales tax of 9.0% Total Order with tax if applicable: Order Totals #12
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.
Povinelli, L.A.
1990-01-01T23:59:59.000Z
An overview is given of research activity on the application of computational fluid dynamics (CDF) for hypersonic propulsion systems. After the initial consideration of the highly integrated nature of air-breathing hypersonic engines and airframe, attention is directed toward computations carried out for the components of the engine. A generic inlet configuration is considered in order to demonstrate the highly three dimensional viscous flow behavior occurring within rectangular inlets. Reacting flow computations for simple jet injection as well as for more complex combustion chambers are then discussed in order to show the capability of viscous finite rate chemical reaction computer simulations. Finally, the nozzle flow fields are demonstrated, showing the existence of complex shear layers and shock structure in the exhaust plume. The general issues associated with code validation as well as the specific issue associated with the use of CFD for design are discussed. A prognosis for the success of CFD in the design of future propulsion systems is offered.
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.
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.
Ordered involutive operator spaces
Blecher, David P; Neal, Matthew; Werner, Wend
2007-01-01T23:59:59.000Z
This is a companion to recent papers of the authors; here we construct the `noncommutative Shilov boundary' of a (possibly nonunital) selfadjoint ordered space of Hilbert space operators. The morphisms in the universal property of the boundary preserve order. As an application, we consider `maximal' and `minimal' unitizations of such ordered operator spaces.
IMPRESS CONNECT DOCUMENT ORDERING
Asaithambi, Asai
IMPRESS CONNECT DOCUMENT ORDERING USER GUIDE FOR UNF August 2010 #12;OFFICEMAX IMPRESS CONNECT USERMax (case sensitive) Click on "Create New Custom Print Order" under Print & Document Services #12;The first landing page. You will see 3 options across the top of the landing page: Order Jobs, Track Jobs, Manage
Cooling Flows or Heating Flows?
James Binney
2003-10-08T23:59:59.000Z
It is now clear that AGN heat cooling flows, largely by driving winds. The winds may contain a relativistic component that generates powerful synchrotron radiation, but it is not clear that all winds do so. The spatial and temporal stability of the AGN/cooling flow interaction are discussed. Collimation of the winds probably provides spatial stability. Temporal stability may be possible only for black holes with masses above a critical value. Both the failure of cooling flows to have adiabatic cores and the existence of X-ray cavities confirm the importance of collimated outflows. I quantify the scale of the convective flow that the AGN Hydra would need to drive if it balanced radiative inward flow by outward flow parallel to the jets. At least in Virgo any such flow must be confined to r<~20 kpc. Hydrodynamical simulations suggest that AGN outbursts cannot last longer than ~25 Myr. Data for four clusters with well studied X-ray cavities suggests that heating associated with cavity formation approximately balances radiative cooling. The role of cosmic infall and the mechanism of filament formation are briefly touched on.
RETROSPECTIVE: Higher-order control-flow analysis in retrospect
Shivers, Olin
that the SSA revolution in the traditional com- piler community was essentially CPS in another guise [10 there are interesting program analyses and optimisations that require this kind of extra power. CPS as an intermediate representation based on continuation-passing style (CPS). This continued a line of work originating with Steele
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 ...
The Complexity of Flow Analysis in Higher-Order Languages
Strickland, Stevie
Smaragdakis. Thomas Reps. Assaf Kfoury. Jef- frey Mark Siskind. David Foster Wallace. Timothy J. Hickey. Myrna
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.
Constraints on low order models: The cost of simplicity
Lebovitz, Norman
the transition to turbulence and the coherent structures which form. The low order model on which the Self Sustaining Process [10] for turbulence in Couette flow is examined with respect to mean conservation laws
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.
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.
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.
Ordered transport and identification of particles
Shera, E. Brooks (Los Alamos, NM)
1993-01-01T23:59:59.000Z
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.
On ordered $?$-semigroups ($?$-semigroups)
Niovi Kehayopulu
2014-03-05T23:59:59.000Z
We add here some further characterizations to the characterizations of strongly regular ordered $\\Gamma$-semigroups already considered in Hacettepe J. Math. 42 (2013), 559--567. Our results generalize the characterizations of strongly regular ordered semigroups given in the Theorem in Math. Japon. 48 (1998), 213--215, in case of ordered $\\Gamma$-semigroups. The aim of writing this paper is not just to add a publication in $\\Gamma$-semigroups but, mainly, as a continuation of the paper "On regular duo $po$-$\\Gamma$-semigroups in Math. Slovaca 61 (2011), 871--884, to publish a paper which serves as an example to show what a $\\Gamma$-semigroup is and give the right information about this structure.
H. Bombin; M. A. Martin-Delgado
2008-03-30T23:59:59.000Z
We introduce the concept of nested topological order in a class of exact quantum lattice Hamiltonian models with non-abelian discrete gauge symmetry. The topological order present in the models can be partially destroyed by introducing a gauge symmetry reduction mechanism. When symmetry is reduced in several islands only, this imposes boundary conditions to the rest of the system giving rise to topological ground state degeneracy. This degeneracy is related to the existence of topological fluxes in between islands or, alternatively, hidden charges at islands. Additionally, island deformations give rise to an extension of topological quantum computation beyond quasiparticles.
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: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Flow Cell EMSL's Subsurface Flow and Transport Experimental Laboratory offers several meter-scale flow cells and columns for research in saturated and unsaturated porous media....
Constraints on flow regimes in wide-aperture fractures
Ghezzehei, Teamrat A.
2004-02-28T23:59:59.000Z
In recent years, significant advances have been made in our understanding of the complex flow processes in individual fractures, aided by flow visualization experiments and conceptual modeling efforts. These advances have led to the recognition of several flow regimes in individual fractures subjected to different initial and boundary conditions. Of these, the most important regimes are film flow, rivulet flow, and sliding of droplets. The existence of such significantly dissimilar flow regimes has been a major hindrance in the development of self-consistent conceptual models of flow for single fractures that encompass all the flow regimes. The objective of this study is to delineate the existence of the different flow regimes in individual fractures. For steady-state flow conditions, we developed physical constraints on the different flow regimes that satisfy minimum energy configurations, which enabled us to segregate the wide range of fracture transmissivity (volumetric flow rate per fracture width) into several flow regimes. These are, in increasing order of flow rate, flow of adsorbed films, flow of sliding drops, rivulet flow, stable film flow, and unstable (turbulent) film flow. The scope of this study is limited to wide-aperture fractures with the flow on the opposing sides of fracture being independent.
Accurate solution algorithms for incompressible multiphase flows
Rider, W.J.; Kothe, D.B.; Mosso, S.J.; Cerutti, J.H. [Los Alamos National Lab., NM (United States); Hochstein, J.I. [Memphis State Univ., TN (United States). Dept. of Mechanical Engineering
1994-10-19T23:59:59.000Z
A number of advances in modeling multiphase incompressible flow are described. These advances include high-order Godunov projection methods, piecewise linear interface reconstruction and tracking and the continuum surface force model. Examples are given.
Membrane-less hydrogen bromine flow battery
Braff, William A.
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 ...
Available transfer capability and first order sensitivity
Gravener, M.H. [PJM Interconnection, L.L.C., Valley Forge, PA (United States)] [PJM Interconnection, L.L.C., Valley Forge, PA (United States); Nwankpa, C. [Drexel Univ., Philadelphia, PA (United States)] [Drexel Univ., Philadelphia, PA (United States)
1999-05-01T23:59:59.000Z
A method of calculating Available Transfer Capability and the exploration of the first order effects of certain power system network variables are described. The Federal Energy Regulatory Commission has ordered that bulk electrical control areas must provide to market participants a ``commercially viable`` network transfer capability for the import, export, and through-put of energy. A practical method for deriving this transfer capability utilizing both linear and non-linear power flow analysis methods is developed that acknowledges both thermal and voltage system limitations. The Available Transfer Capability is the incremental transfer capability derived by the method reduced by margins. A procedure for quantifying the first order effect of network uncertainties such as load forecast error and simultaneous transfers on the calculated transfer capability of a power system snapshot are explored. The quantification of these network uncertainties can provide information necessary for system operation, planning, and energy market participation.
Electroosmotic flow pumps with polymer frits Shulin Zenga,*
Santiago, Juan G.
Electroosmotic flow pumps with polymer frits Shulin Zenga,* , Chuan-Hua Chena , Juan G. Santiagoa 11 November 2001 Abstract Electroosmotic flow (EOF) pumps with flow rates on the order of 1 ml/min have been designed and fabricated. These pumps use EOF to propel liquid solutions in a compact system
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).
Meixler, Lewis D. (East Windsor, NJ)
1993-01-01T23:59:59.000Z
The low flow monitor provides a means for determining if a fluid flow meets a minimum threshold level of flow. The low flow monitor operates with a minimum of intrusion by the flow detection device into the flow. The electrical portion of the monitor is externally located with respect to the fluid stream which allows for repairs to the monitor without disrupting the flow. The electronics provide for the adjustment of the threshold level to meet the required conditions. The apparatus can be modified to provide an upper limit to the flow monitor by providing for a parallel electronic circuit which provides for a bracketing of the desired flow rate.
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 ...
Cevik, Muhammet
2013-09-11T23:59:59.000Z
homogenized flow for several pipe diameters downstream of the plate. This characteristic provides a homogeneous mixture at the inlet of the swirl meter, and impedance probe for gas volume fraction measurement (GVF). In order to evaluate the performance...
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 ...
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 ...
Cofinal types of directed orders
MÃ¡trai, TamÃ¡s
, ) directed partial orders #12;Cofinal types (P, ), (Q, ) directed partial orders Tukey reducibility: (P orders Tukey reducibility: (P, ) T (Q, ) if f : P Q X P unbounded = f [X] Q unbounded g : Q P Y Q cofinal = g[Y ] P cofinal #12;Cofinal types (P, ), (Q, ) directed partial orders Tukey reducibility: (P
A survey of air flow models for multizone structures
Feustel, H.E.; Dieris, J.
1991-03-01T23:59:59.000Z
Air flow models are used to simulate the rates of incoming and outgoing air flows for a building with known leakage under given weather and shielding conditions. Additional information about the flow paths and air-mass flows inside the building can only by using multizone air flow models. In order to obtain more information on multizone air flow models, a literature review was performed in 1984. A second literature review and a questionnaire survey performed in 1989, revealed the existence of 50 multizone air flow models, all developed since 1966, two of which are still under development. All these programs use similar flow equations for crack flow but differ in the versatility to describe the full range of flow phenomena and the algorithm provided for solving the set of nonlinear equations. This literature review was found that newer models are able to describe and simulate the ventilation systems and interrelation of mechanical and natural ventilation. 27 refs., 2 figs., 1 tab.
Enciso, Juan; Santistevan, Dean; Hla, Aung K.
2007-10-01T23:59:59.000Z
Propeller flow meters are commonly used to measure water flow rate. They can also be used to estimate irrigation water use. This publication explains how to select, install, read and maintain propeller flow meters....
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 ...
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 ...
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.
Flow Distances on Open Flow Networks
Guo, Liangzhu; Shi, Peiteng; Wang, Jun; Huang, Xiaohan; Zhang, Jiang
2015-01-01T23:59:59.000Z
Open flow network is a weighted directed graph with a source and a sink, depicting flux distributions on networks in the steady state of an open flow system. Energetic food webs, economic input-output networks, and international trade networks, are open flow network models of energy flows between species, money or value flows between industrial sectors, and goods flows between countries, respectively. Flow distances (first-passage or total) between any given two nodes $i$ and $j$ are defined as the average number of transition steps of a random walker along the network from $i$ to $j$ under some conditions. They apparently deviate from the conventional random walk distance on a closed directed graph because they consider the openness of the flow network. Flow distances are explicitly expressed by underlying Markov matrix of a flow system in this paper. With this novel theoretical conception, we can visualize open flow networks, calculating centrality of each node, and clustering nodes into groups. We apply fl...
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.
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.
Flowing Liquid Crystal Simulating the Schwarzschild Metric
Erms R. Pereira; Fernando Moraes
2010-11-21T23:59:59.000Z
We show how to simulate the equatorial section of the Schwarzschild metric through a flowing liquid crystal in its nematic phase. Inside a liquid crystal in the nematic phase, a traveling light ray feels an effective metric, whose properties are linked to perpendicular and parallel refractive indexes, $n_o$ e $n_e$ respectively, of the rod-like molecule of the liquid crystal. As these indexes depend on the scalar order parameter of the liquid crystal, the Beris-Edwards hydrodynamic theory is used to connect the order parameter with the velocity of a liquid crystal flow at each point. This way we calculate a radial velocity profile that simulates the equatorial section of the Schwarzschild metric, in the region outside of Schwarzschild's radius, in the nematic phase of the liquid crystal. In our model, the higher flow velocity can be of the order of some meters per second.
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),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of EnergyEnergyENERGY TAXBalanced ScorecardReactor TechnologyOFFICE: NEPA REVIEWS:EnergyORAU
K-inflationary power spectra at second order
Martin, Jérôme; Vennin, Vincent [Institut d'Astrophysique de Paris, UMR 7095-CNRS, Université Pierre et Marie Curie, 98bis boulevard Arago, 75014 Paris (France); Ringeval, Christophe, E-mail: jmartin@iap.fr, E-mail: christophe.ringeval@uclouvain.be, E-mail: vennin@iap.fr [Centre for Cosmology, Particle Physics and Phenomenology, Institute of Mathematics and Physics, Louvain University, 2 Chemin du Cyclotron, 1348 Louvain-la-Neuve (Belgium)
2013-06-01T23:59:59.000Z
Within the class of inflationary models, k-inflation represents the most general single field framework that can be associated with an effective quadratic action for the curvature perturbations and a varying speed of sound. The incoming flow of high-precision cosmological data, such as those from the Planck satellite and small scale Cosmic Microwave Background (CMB) experiments, calls for greater accuracy in the inflationary predictions. In this work, we calculate for the first time the next-to-next-to-leading order scalar and tensor primordial power spectra in k-inflation needed in order to obtain robust constraints on the inflationary theory. The method used is the uniform approximation together with a second order expansion in the Hubble and sound flow functions. Our result is checked in various limits in which it reduces to already known situations.
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Management. 4. IMPLEMENTATION a. The requirements can be found in the document listed in Section 6 of this order. The Office of Institutional Operations through the Site...
Enhancing the Understanding and Importance of Granting Instream Flow
Fay, Noah
, meaning that the geomorphology, or shape of the stream, does not change through this legal use. One an executive order dealing with the importance of riparian areas in Arizona in 1991. The order recognized of Instream Flows In February of 1991 The Governor of Arizona Rose Mofford issued Executive Order No. 91
An Arnoldi Approach for Generation of ReducedOrder Models for Turbomachinery
Peraire, Jaime
An Arnoldi Approach for Generation of ReducedÂOrder Models for Turbomachinery Karen Willcox used for aeroelastic analyses of turbomachinery. The flow is usually assumed to be two
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.
Rajeev Singh; Subinay Dasgupta; Sitabhra Sinha
2010-11-23T23:59:59.000Z
Homogeneous populations of oscillators have recently been shown to exhibit stable coexistence of coherent and incoherent regions. Generalizing the concept of chimera states to the context of order-disorder transition in systems at thermal equilibrium, we show analytically that such complex ordering can appear in a system of Ising spins, possibly the simplest physical system exhibiting this phenomenon. We also show numerically the existence of chimera ordering in 3-dimensional spin systems that model layered magnetic materials, suggesting possible means of experimentally observing such states.
Amerikooler: Order (2013-CE-5307)
Broader source: Energy.gov [DOE]
DOE ordered Amerikooler, Inc. to pay a $8,000 civil penalty after finding Amerikooler had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Trastar: Order (2013-CE-49003)
Broader source: Energy.gov [DOE]
DOE ordered Trastar Inc. to pay a $8,000 civil penalty after finding Trastar had failed to certify that certain basic models of traffic signal modules and pedestrian modules comply with the applicable energy conservation standards.
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.
Broader source: Energy.gov [DOE]
DOE ordered Trojan, Inc. to pay a $6,000 civil penalty after finding Trojan had failed to certify that certain models of incandescent reflector lamps comply with the applicable energy conservation standards.
Broader source: Energy.gov [DOE]
DOE ordered Dacor to pay a $8,000 civil penalty after finding Dacor had failed to certify that certain models of cooking products comply with the applicable energy conservation standards.
Northland: Order (2014-CE-23002)
Broader source: Energy.gov [DOE]
DOE ordered Northland Corporation d/b/a AGA Marvel to pay a $16,000 civil penalty after finding Northland had failed to certify that certain models of cooking products comply with the applicable energy conservation standards.
PCV valve flutter : vibration characterization through pressure and flow
Gomez, Nicasio
2005-01-01T23:59:59.000Z
A Positive Crankcase Ventilation, or PCV, valve is required by internal combustion engines in order to regulate the flow of blow-by gases out of the crankcase and into the intake air stream. Fluctuations in the pressure ...
A New Aerosol Flow System for Photochemical and Thermal Studies...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
be applied simultaneously. The residence time is of the order of an hour, and sampling ports located along the length of the flow tube allow for time-resolved measurements of...
Parallel-Flow-Shear Driven Low-Frequency Plasma Instability
Ishiguro, Seiji [Theory and Computer Simulation Center, National Institute for Fusion Science, Toki-shi, Gifu 509-5292 (Japan); Matsumoto, Noriaki; Kaneko, Toshiro; Hatakeyama, Rikizo [Department of Electronic Engineering, Tohoku University, Sendai 980-8579 (Japan)
2004-12-01T23:59:59.000Z
Full three dimensional Particle-in-Cell (PIC) simulations are performed in order to investigate effects of field-aligned (parallel) ion flow shears on low-frequency plasma instabilities. It is shown that the parallel ion flow velocity shear can induce the ion-acoustic instability, even when the ion flow velocity is so small that the instability can not take place. Simulation results are consistent with the analysis based on the local theory.
A New Approach to Computing Max Flows using Electrical Flows
Rajamani, Sriram K.
A New Approach to Computing Max Flows using Electrical Flows Yin Tat Lee (MIT) Satish Rao (UC-Kelner-Madry-Spielman-Teng'11]: approximate flow in time Uses electrical flows. 7 #12;Electrical Flows 3 1 S t 8 #12;Electrical Flows Identify Graph with Resistor Network R(e)=1/w(e) 1/3 S t 1 9 #12;Electrical Flows Electrical flow
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.
Octupolar order in two dimensions
Epifanio G. Virga
2015-03-16T23:59:59.000Z
Octupolar order is described in two space dimensions in terms of the maxima (and conjugated minima) of the probability density associated with a third-rank, fully symmetric and traceless tensor. Such a representation is shown to be equivalent to diagonalizing the relevant third-rank tensor, an equivalence which however is only valid in the two-dimensional case.
Executive Order 1083 Attachment C
de Lijser, Peter
Rev 2/2013 Executive Order 1083 Attachment C California Child Abuse and Neglect Reporting Act Penal, an administrator, or an employee of a licensed community care or child day care facility. (11) A Head Start program in Section 11165.11. (13) A public assistance worker. (14) An employee of a child care institution, including
Executive Order 1083 Attachment C
Eirinaki, Magdalini
Executive Order 1083 Attachment C California Child Abuse and Neglect Reporting Act Penal Code, an administrator, or an employee of a licensed community care or child day care facility. (11) A Head Start program in Section 11165.11. (13) A public assistance worker. (14) An employee of a child care institution, including
Versonel: Order (2014-CE-21009)
Broader source: Energy.gov [DOE]
DOE ordered Smart Surplus, Inc. d/b/a Versonel to pay a $8,000 civil penalty after finding Versonel had failed to certify that certain models of refrigerators and residential clothes dryers comply with the applicable energy conservation standards.
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.
Modeling the influence of optic flow on grid cell firing in the absence of other cues1
Hasselmo, Michael
Modeling the influence of optic flow on grid cell firing in the absence of other cues1 Florian affect the firing of grid cells recorded in entorhinal cortex of rats. Optic flow provides information and superimposed with noise in order to model the optic flow that would be available to the rat. This optic flow
Isabelle Cantat; Renaud Delannay
2005-07-21T23:59:59.000Z
We analyze the flow of a liquid foam between two plates separated by a gap of the order of the bubble size (2D foam). We concentrate on the salient features of the flow that are induced by the presence, in an otherwise monodisperse foam, of a single large bubble whose size is one order of magnitude larger than the average size. We describe a model suited for numerical simulations of flows of 2D foams made up of a large number of bubbles. The numerical results are successfully compared to analytical predictions based on scaling arguments and on continuum medium approximations. When the foam is pushed inside the cell at a controlled rate, two basically different regimes occur: a plug flow is observed at low flux whereas, above a threshold, the large bubble migrates faster than the mean flow. The detailed characterization of the relative velocity of the large bubble is the essential aim of the present paper. The relative velocity values, predicted both from numerical and from analytical calculations that are discussed here in great detail, are found to be in fair agreement with experimental results.
Peraire, Jaime
Hypersonic Heat Transfer and Anisotropic Visualization with a Higher Order Discontinuous Galerkin;Hypersonic Heat Transfer and Anisotropic Visualization with a Higher Order Discontinuous Galerkin Finite used to predict heat transfer to a cylinder in a hypersonic flow. The strong shock is captured
Order is Power: Selective Packet Interleaving for Energy Efficient Networks-on-Chip
Ginosar, Ran
Order is Power: Selective Packet Interleaving for Energy Efficient Networks-on-Chip Amit Berman RanCs in order to supply higher throughput demands [26]. Each VC holds a buffer of flits pertaining to one flow of a certain output port. Each VC holds a packet consisting of four flits, and each flit consists of four bits
Atomic Ordering Enhanced Electrocatalytic Activity of Nanoalloys...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Ordering Enhanced Electrocatalytic Activity of Nanoalloys for Oxygen Reduction Reaction. Atomic Ordering Enhanced Electrocatalytic Activity of Nanoalloys for Oxygen Reduction...
Perturbative Gadgets at Arbitrary Orders
Stephen P. Jordan; Edward Farhi
2012-01-31T23:59:59.000Z
Adiabatic quantum algorithms are often most easily formulated using many-body interactions. However, experimentally available interactions are generally two-body. In 2004, Kempe, Kitaev, and Regev introduced perturbative gadgets, by which arbitrary three-body effective interactions can be obtained using Hamiltonians consisting only of two-body interactions. These three-body effective interactions arise from the third order in perturbation theory. Since their introduction, perturbative gadgets have become a standard tool in the theory of quantum computation. Here we construct generalized gadgets so that one can directly obtain arbitrary k-body effective interactions from two-body Hamiltonians. These effective interactions arise from the kth order in perturbation theory.
Mitchell, Randall J.
1 Productivity & Energy Flow Ecosystem approach, focuses: on flow of energy, water, and nutrients (capture) of energy by autotrophs Gross (total) Net (total Â costs) Secondary productivity- capture of energy by herbivores http://sciencebitz.com/?page_id=204 What Controls the Primary Productivity
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.
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 Leichta,b , Ralf Hartmann,a,b aInstitute of Aerodynamics and Flow Technology, DLR (German Aerospace Center-dimensional laminar aerodynamic flow simulations. The optimal order symmetric interior penalty discontinuous Galerkin
All Order Linearized Hydrodynamics from Fluid/Gravity Correspondence
Yanyan Bu; Michael Lublinsky
2014-11-02T23:59:59.000Z
Using fluid/gravity correspondence, we determine the (linearized) stress energy tensor of $\\mathcal{N}=4$ super-Yang-Mills theory at strong coupling with all orders in derivatives of fluid velocity included. We find that the dissipative effects are fully encoded in the shear term and a new one, which emerges starting from the third order. We derive, for the first time, closed linear holographic RG flow-type equations for (generalized) momenta-dependent viscosity functions. In the hydrodynamic regime, we obtain the stress tensor up to third order in derivative expansion analytically. We then numerically determine the viscosity functions up to large momenta. As a check of our results, we also derive the generalized Navier-Stokes equations from the Einstein equations in the dual gravity.
Public Order and Safety Buildings
U.S. Energy Information Administration (EIA) 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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2007 10,998 9,933 10,998 10,643 10,998throughThousand CubicWashington Natural Gas Exports2. TypesOrder and
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),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the ContributionsArms Control R&DNuclear fuelOPTICS FOR A PHOTOINJECTEDthe YearORDER2
Real-time planar flow velocity measurements using an optical flow algorithm implemented on GPU
Gautier, N
2013-01-01T23:59:59.000Z
This paper presents a high speed implementation of an optical flow algorithm which computes planar velocity fields in an experimental flow. Real-time computation of the flow velocity field allows the experimentalist to have instantaneous access to quantitative features of the flow. This can be very useful in many situations: fast evaluation of the performances and characteristics of a new setup, design optimization, easier and faster parametric studies, etc. It can also be a valuable measurement tool for closed-loop flow control experiments where fast estimation of the state of the flow is needed. The algorithm is implemented on a Graphics Processing Unit (GPU). The accuracy of the computation is shown. Computation speed and scalability are highlighted along with guidelines for further improvements. The system architecture is flexible, scalable and can be adapted on the fly in order to process higher resolutions or achieve higher precision. The set-up is applied on a Backward-Facing Step (BFS) flow in a hydro...
Shroud leakage flow discouragers
Bailey, Jeremy Clyde (Middle Grove, NY); Bunker, Ronald Scott (Niskayuna, NY)
2002-01-01T23:59:59.000Z
A turbine assembly includes a plurality of rotor blades comprising a root portion, an airfoil having a pressure sidewall and a suction sidewall, and a top portion having a cap. An outer shroud is concentrically disposed about said rotor blades, said shroud in combination with said tip portions defining a clearance gap. At least one circumferential shroud leakage discourager is disposed within the shroud. The leakage discourager(s) increase the flow resistance and thus reduce the flow of hot gas flow leakage for a given pressure differential across the clearance gap to improve overall turbine efficiency.
Richard Schultz
2011-09-01T23:59:59.000Z
The purpose of the fluid dynamics experiments in the MIR (Matched Index of-Refraction) flow system at Idaho National Laboratory (INL) is to develop benchmark databases for the assessment of Computational Fluid Dynamics (CFD) solutions of the momentum equations, scalar mixing, and turbulence models for the flow ratios between coolant channels and bypass gaps in the interstitial regions of typical prismatic standard fuel element (SFE) or upper reflector block geometries of typical Modular High-temperature Gas-cooled Reactors (MHTGR) in the limiting case of negligible buoyancy and constant fluid properties. The experiments use Particle Image Velocimetry (PIV) to measure the velocity fields that will populate the bypass flow study database.
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.
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.
A study of the coherent structures and installation effects in an orifice flow meter
Pattabhi, Srikanth
2012-06-07T23:59:59.000Z
. Errors on the order of approximately 250 millions of dollar per year have been estimated for the natural gas industry. The urgent need to improve the accuracy has fueled basic research in the area of orifice flow meters. The objectives of this present... study were to analyze the coherent structures present in an orifice flow meter, and to examine the effect of a flow conditioner placed upstream of the orifice plate on the flow meter's accuracy, The coherent structures were measured by performing...
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 ...
Neuenschwander, Ulrich
Handling hazardous multiphase reactions in flow brings not only safety advantages but also significantly improved performance, due to better mass transfer characteristics. In this paper, we present a continuous microreactor ...
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.
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.
Reduced order modeling of fluid/structure interaction.
Barone, Matthew Franklin; Kalashnikova, Irina; Segalman, Daniel Joseph; Brake, Matthew Robert
2009-11-01T23:59:59.000Z
This report describes work performed from October 2007 through September 2009 under the Sandia Laboratory Directed Research and Development project titled 'Reduced Order Modeling of Fluid/Structure Interaction.' This project addresses fundamental aspects of techniques for construction of predictive Reduced Order Models (ROMs). A ROM is defined as a model, derived from a sequence of high-fidelity simulations, that preserves the essential physics and predictive capability of the original simulations but at a much lower computational cost. Techniques are developed for construction of provably stable linear Galerkin projection ROMs for compressible fluid flow, including a method for enforcing boundary conditions that preserves numerical stability. A convergence proof and error estimates are given for this class of ROM, and the method is demonstrated on a series of model problems. A reduced order method, based on the method of quadratic components, for solving the von Karman nonlinear plate equations is developed and tested. This method is applied to the problem of nonlinear limit cycle oscillations encountered when the plate interacts with an adjacent supersonic flow. A stability-preserving method for coupling the linear fluid ROM with the structural dynamics model for the elastic plate is constructed and tested. Methods for constructing efficient ROMs for nonlinear fluid equations are developed and tested on a one-dimensional convection-diffusion-reaction equation. These methods are combined with a symmetrization approach to construct a ROM technique for application to the compressible Navier-Stokes equations.
called "artificial boundary conditions" to replace the boundary conditions at infinity. To solve this problem we construct -- by combining results from dynamical systems theory with matched asymptotic field depending explicitly on drag and lift and describing the solution to second and dominant third
International Refrigeration: Order (2012-CE-1510) | Department...
Broader source: Energy.gov (indexed) [DOE]
Refrigeration: Order (2012-CE-1510) July 20, 2012 DOE ordered International Refrigeration Products to pay an 8,000 civil penalty after finding International Refrigeration had...
Executive Order 13423: Strengthening Federal Environmental, Energy...
Broader source: Energy.gov (indexed) [DOE]
text of Executive Order 13423: Strengthening Federal Environmental, Energy, and Transportation Management. eo13423.pdf More Documents & Publications Executive Order 13423-...
these pages are in correct order
We ?rst list in alphabetical order 10 judg- ... We make angle judgments when we read a pie chart, but we ..... data range over several orders of magnitude.
Section 13: Flow control 1 Section 13: Flow control
Kohlenbach, Ulrich
Geometries for Energyefficient Flow Around Bodies Abstract 14:30 14:50: Elfriede Friedmann (Universität
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
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.
Trivializing maps, the Wilson flow and the HMC algorithm
Martin Lüscher
2009-12-03T23:59:59.000Z
In lattice gauge theory, there exist field transformations that map the theory to the trivial one, where the basic field variables are completely decoupled from one another. Such maps can be constructed systematically by integrating certain flow equations in field space. The construction is worked out in some detail and it is proposed to combine the Wilson flow (which generates approximately trivializing maps for the Wilson gauge action) with the HMC simulation algorithm in order to improve the efficiency of lattice QCD simulations.
Morozov, Victor (Manassas, VA)
2011-04-05T23:59:59.000Z
A flow cell for electrophoretically-assisted capturing analytes from a flow. The flow cell includes a specimen chamber, a first membrane, a second membrane, a first electrode chamber, and a second electrode chamber. The specimen chamber may have a sample inlet and a sample outlet. A first portion of the first membrane may be coupled to a first portion of the specimen chamber. A first portion of the second membrane may be coupled to a second portion of the specimen chamber. The first electrode chamber may be configured to accept a charge. A portion of the first electrode chamber may be coupled to a second portion of the first membrane. A second electrode chamber may be configured to accept an opposite charge. A portion of the second electrode chamber may be coupled to a second portion of the second membrane.
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.
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, 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.
James Binney
2001-03-23T23:59:59.000Z
For two decades the steady-state cooling-flow model has dominated the literature of cluster and elliptical-galaxy X-ray sources. For ten years this model has been in severe difficulty from a theoretical point of view, and it is now coming under increasing pressure observationally. For two decades the steady-state cooling-flow model has dominated the literature of cluster and elliptical-galaxy X-ray sources. For ten years this model has been in severe difficulty from a theoretical point of view, and it is now coming under increasing pressure observationally. A small number of enthusiasts have argued for a radically different interpretation of the data, but had little impact on prevailing opinion because the unsteady heating picture that they advocate is extremely hard to work out in detail. Here I explain why it is difficult to extract robust observational predictions from the heating picture. Major problems include the variability of the sources, the different ways in which a bi-polar flow can impact on X-ray emission, the weakness of synchrotron emission from sub-relativistic flows, and the sensitivity of synchrotron emission to a magnetic field that is probably highly localized.
Generalized structure of higher order nonclassicality
Amit Verma; Anirban Pathak
2009-01-21T23:59:59.000Z
A generalized notion of higher order nonclassicality (in terms of higher order moments) is introduced. Under this generalized framework of higher order nonclassicality, conditions of higher order squeezing and higher order subpoissonian photon statistics are derived. A simpler form of the Hong-Mandel higher order squeezing criterion is derived under this framework by using an operator ordering theorem introduced by us in [J. Phys. A. 33 (2000) 5607]. It is also generalized for multi-photon Bose operators of Brandt and Greenberg. Similarly, condition for higher order subpoissonian photon statistics is derived by normal ordering of higher powers of number operator. Further, with the help of simple density matrices, it is shown that the higher order antibunching (HOA) and higher order subpoissonian photon statistics (HOSPS) are not the manifestation of the same phenomenon and consequently it is incorrect to use the condition of HOA as a test of HOSPS. It is also shown that the HOA and HOSPS may exist even in absence of the corresponding lower order phenomenon. Binomial state, nonlinear first order excited squeezed state (NLESS) and nonlinear vacuum squeezed state (NLVSS) are used as examples of quantum state and it is shown that these states may show higher order nonclssical characteristics. It is observed that the Binomial state which is always antibunched, is not always higher order squeezed and NLVSS which shows higher order squeezing does not show HOSPS and HOA. The opposite is observed in NLESS and consequently it is established that the HOSPS and HOS are two independent signatures of higher order nonclassicality
Cvitanovc', Predrag
XXIII ICTAM, 19Â24 August 2012, Beijing, China REVEALING THE GEOMETRY OF TURBULENT PIPE FLOW GÃ¶ttingen, Germany Summary Symmetry reduction by the `method of slices' is applied to a pipe flow in order traveling wave solutions, and find, for the first time for pipe flows, relative periodic orbits
Colloidal particle deposition in turbulent flow
Morton, D.S.
1994-05-01T23:59:59.000Z
A theoretical analysis is presented which describes the initial deposition of monodispersed spherical colloidal particles from a steady fully developed turbulent flow onto conduit walls. When the net particle-conduit electrical interaction potential is attractive, particle deposition is shown to be often governed by turbulent hydrodynamics. When the net particle-conduit electrical interaction potential possess a repulsive maximum, particle deposition to first order is uniform and depends solely on electrical interaction effects. The developed theoretical model specialized to orifice deposition with the use of Harwell Flow3D turbulence modelling software qualitatively described the deposition of 0.5 {mu}m silica particles onto glass orifices from an aqueous suspension. The effect of the electrical double layer on the rate of colloidal particle deposition in laminar flow has been described by Spielman and Friedlander (1), Dahneke (2), Bowen et al. (3) and Bowen and Epstein (4). This article describes the extension of their work to colloidal particle deposition under steady fully developed turbulent flow conditions. This article also reports the results of orifice particle deposition experiments which were conducted to qualitatively investigate the developed theoretical model.
On the order of general linear methods.
Constantinescu, E. M.; Mathematics and Computer Science
2009-09-01T23:59:59.000Z
General linear (GL) methods are numerical algorithms used to solve ODEs. The standard order conditions analysis involves the GL matrix itself and a starting procedure; however, a finishing method (F) is required to extract the actual ODE solution. The standard order analysis and stability are sufficient for the convergence of any GL method. Nonetheless, using a simple GL scheme, we show that the order definition may be too restrictive. Specifically, the order for GL methods with low order intermediate components may be underestimated. In this note we explore the order conditions for GL schemes and propose a new definition for characterizing the order of GL methods, which is focused on the final result--the outcome of F--and can provide more effective algebraic order conditions.
Reduced Order Model and Uncertainty Quantification for Stochastic Porous Media Flows
Wei, Jia
2012-10-19T23:59:59.000Z
: : : : : : : : : : : : : : : : : : : : : : : : : : 51 4.1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 52 4.2. Motivation of the ensemble-level idea . . . . . . . . . . . 55 4.3. Ensemble-level MsFEM and ensemble-level preconditioner 57 4.3.1. MsFEM and preconditioner... . . . . . . . . . . . . . 57 4.3.2. Ensemble-level MsFEM and preconditioner . . . . 62 4.4. Numerical results . . . . . . . . . . . . . . . . . . . . . . 66 4.4.1. Ensemble-level multiscale and preconditioner . . . 66 4.4.2. Application in permeability sampling...
Bond-orientational order in sheared dense flows of inelastic hard spheres Piroz Zamankhana)
Tafreshi, Hooman Vahedi
Department of Energy Technology, Lappeenranta University of Technology, Lappeenranta, Finland Caroline L
Second-order Godunov-type scheme for reactive flow calculations on moving meshes
is not resolved by the grid points. Instead in [16] the chemical heat release is put into the Riemann problem of smoothness, written on the graph of the control function, is minimized. The grid-lines are condensed zone is resolved by putting there several grid points in the normal direction. This requires to use
Pauls, Mark
2014-03-18T23:59:59.000Z
multi-objective optimization model to characterize the tradeoffs between water supply shortages and fish 10 population capacity in a stream on the west-slope of the Sierra Nevada mountain range. Harman and Stewardson (2005) evaluated a range...
Executive Order 13423- Strengthening Federal Environmental, Energy...
423- Strengthening Federal Environmental, Energy, and Transportation Management Executive Order 13423- Strengthening Federal Environmental, Energy, and Transportation Management It...
President Truman Orders Development of Thermonuclear Weapon ...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Orders Development of Thermonuclear Weapon | National Nuclear Security Administration Facebook Twitter Youtube Flickr RSS People Mission Managing the Stockpile Preventing...
AIAA 99--1467 LOW ORDER AERODYNAMIC
Peraire, Jaime
AIAA 99--1467 LOW ORDER AERODYNAMIC MODELS FOR AEROELASTIC CONTROL OF TURBOMACHINES K.E. Willcox, J of Aeronautics and Astronautics 1801 Alexander Bell Drive, Suite 500, Reston, VA 22091 #12; LOW ORDER AERODYNAMIC order aerodynamic model is developed for aeroelastic analysis of turbomachines. The proper orÂ thogonal
Analysis of flow patterns and flow mechanisms in soils
Paris-Sud XI, UniversitÃ© de
Analysis of flow patterns and flow mechanisms in soils Dissertation Co-directed by the University of paths, varying flow mechanism or changing soil physical properties (stratification). Thus, in stratified-28Jan2010 #12;This doctoral thesis was prepared at the Department of Soil Physics, University
A void distribution model-flashing flow
Riznic, J.; Ishii, M.; Afgan, N.
1987-01-01T23:59:59.000Z
A new model for flashing flow based on wall nucleations is proposed here and the model predictions are compared with some experimental data. In order to calculate the bubble number density, the bubble number transport equation with a distributed source from the wall nucleation sites was used. Thus it was possible to avoid the usual assumption of a constant bubble number density. Comparisons of the model with the data shows that the model based on the nucleation site density correlation appears to be acceptable to describe the vapor generation in the flashing flow. For the limited data examined, the comparisons show rather satisfactory agreement without using a floating parameter to adjust the model. This result indicated that, at least for the experimental conditions considered here, the mechanistic predictions of the flashing phenomenon is possible on the present wall nucleation based model.
High-Order Accurate Implicit Scheme for Drift-Diffusion Equations and Application to Dielectric
D'Ambrosio, Domenic
and energy from charged particles to neutral ones, significant body forces and heating occurs in the bulk the Stoletov point,12 in order to maximize momentum transfer from charged particles to neutral gas while of separated flows. The dielectric insulator plays a key role in the plasma build-up process. It limits
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.
P. Sikivie
2001-12-04T23:59:59.000Z
The late infall of cold dark matter onto an isolated galaxy, such as our own, produces streams and caustics in its halo. The outer caustics are topological spheres whereas the inner caustics are rings. The self-similar model of galactic halo formation predicts that the caustic ring radii $a_n$ follow the approximate law $a_n \\sim 1/n$. In a study of 32 extended and well-measured external galactic rotation curves evidence was found for this law. In the case of the Milky Way, the locations of eight sharp rises in the rotation curve fit the prediction of the self-similar model at the 3% level. Moreover, a triangular feature in the IRAS map of the galactic plane is consistent with the imprint of a ring caustic upon the baryonic matter. These observations imply that the dark matter in our neighborhood is dominated by a single flow. Estimates of that flow's density and velocity vector are given.
Neutrino Factory Mercury Flow Loop
McDonald, Kirk
Neutrino Factory Mercury Flow Loop V. GravesV. Graves C. Caldwell IDS-NF Videoconference March 9, 2010 #12;Flow Loop Review Â· 1 cm dia nozzle, 20 m/s jet requires 1.57 liter/sec mercury flow (94 2 liter/min 24 9 gpm)mercury flow (94.2 liter/min, 24.9 gpm). Â· MERIT experiment showed that a pump
Orifice flow measurement uncertainty
Samples, C.R.
1984-04-01T23:59:59.000Z
A computer program is now available from Union Carbide that evaluates the total flow uncertainty of orifice flowmeter systems. Tolerance values for every component in the system and the sensitivity of the measured flowrate to each component can be established using historical data and published hardware specifications. Knowing the tolerance and sensitivity values, a total measurement uncertainty can be estimated with a 95% confidence level. This computer program provides a powerful design tool to ensure correct component matching and total metering system optimization.
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.
Order Module--NNSA Orders Self-Study Program Safety Basis Documentatio...
Broader source: Energy.gov (indexed) [DOE]
NNSA Orders Self-Study Program Safety Basis Documentation Order Module--NNSA Orders Self-Study Program Safety Basis Documentation The familiar level of this module is divided into...
Wanakule, Nisita S.; Panday, Ashoutosh; Mullin, Scott A.; Gann, Eliot; Hexemer, Alex; Balsara, Nitash P.; (UCB); (LBNL)
2009-09-15T23:59:59.000Z
Order-order and order-disorder phase transitions in mixtures of poly(styrene-block-ethylene oxide) (SEO) copolymers and lithium bis(trifluoromethylsulfonimide) (LiTFSI), a common lithium salt used in polymer electrolytes, were studied using a combination of small-angle X-ray scattering (SAXS), birefringence, and ac impedance spectroscopy. The SEO/LiTFSI mixtures exhibit lamellar, hexagonally packed cylinders, and gyroid microphases. The molecular weight of the blocks and the salt concentration was adjusted to obtain order-order and order-disorder transition temperatures within the available experimental window. The ionic conductivities of the mixtures, normalized by the ionic conductivity of a 20 kg/mol homopolymer PEO sample at the salt concentration and temperature of interest, were independent of temperature, in spite of the presence of the above-mentioned phase transitions.
Numerical Investigations of Magnetohydrodynamic Hypersonic Flows.
Guarendi, Andrew N
2013-01-01T23:59:59.000Z
??Numerical simulations of magnetohydrodynamic (MHD) hypersonic flow are presented for both laminar and turbulent flow over a cylinder and flow entering a scramjet inlet. ANSYS… (more)
C. B. Das; L. Shi; S. Das Gupta
2004-07-20T23:59:59.000Z
The Lattice Gas Model was extended to incorporate the effect of radial flow. Contrary to popular belief, radial flow has little effect on the clusterization process in intermediate energy heavy-ion collisions except adding an ordered motion to the particles in the fragmentation source. We compared the results from the lattice gas model with and without radial flow to experimental data. We found that charge yields from central collisions are not significantly affected by inclusion of any reasonable radial flow.
Flow Beneath a Ship at Small Underkeel Clearance Tim Gourlay
the leading order squat and wave resistance of a ship traveling in calm water, in the case where the water in this case) kinematic viscosity of the fluid (we will consider salt water at 20 deg C, for which 1.04 Ã? 10 THEORETICAL RESEARCH has been done into the flow around a ship operating in shallow water, using Prandtl
Analysis of Transient Processes in a Radiophysical Flow System
E. N. Egorov; A. A. Koronovskii; A. E. Hramov
2006-01-31T23:59:59.000Z
Transient processes in a third-order radiophysical flow system are studied and a map of the transient process duration versus initial conditions is constructed and analyzed. The results are compared to the arrangement of submanifolds of the stable and unstable cycles in the Poincare section of the system studied.
Direct numerical simulation of turbulent Taylor–Couette flow
2007-08-23T23:59:59.000Z
the flow is characterized by the radius ratio, ? = R1/R2, where R1 and R2 are the radii ... vortices at the critical onset Taylor number Tc (defined as the Taylor number at which ... Beyond 5 × 105Tc these turbulent vortices became fragmented and lost .... employ a stiffly stable velocity-correction-type scheme with a third-order ...
Computational methods for several models of ice stream flow
Brown, Jed
on any grid Shallow ice approximation produces oscillatory solutions Nonlinear and linear solvers haveComputational methods for several models of ice stream flow Jed Brown Laboratory of Hydrology transition at ice stream margins Bed slope is discontinuous and of order 1. Taylor expansions no longer valid
Post processing large integer programming problems in air traffic flow management
Gangadharan, Rajesh
1994-01-01T23:59:59.000Z
The Federal Aviation Administration is keen to develop new strategies for air traffic control, in order to better tackle the numerous problems arising due to increasing traffic in the national air space. The Traffic Flow Management (TFM) problem...
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...
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.
Word Order Variables in Patzun Kaqchikel
Kim, Sok-Ju
2011-10-03T23:59:59.000Z
with the previous analysis of word orders in (Patzicia) Kaqchikel by Broadwell (2000).2 In Patzun Kaqchikel, in intransitive clauses, either SV word order or VS word order is possible in statements and questions. (1) a. ri n...-tz’ih n-anin3 def poss.1sg-dog inc.3sA-run “My dog runs.” SV+statement “Does my dog run?” SV+question b. n-anin ri n-tz’ih inc.3s...
Rousculp, Christopher L [Los Alamos National Laboratory
2011-01-12T23:59:59.000Z
Task Order 10 formalizes a collaboration in high explosive pulsed power (HEPP) experiments between LANL and VNIIEF. The focus is the VNIIEF disk explosive magnetic generator (DEMG) technology. The task order outlines a sequence of tasks and deliverables culminating in an experiment which takes place in the US utilizing US explosives and a Russian DEMG. This talk summarizes task order 10. It gives a brief history and present status in terms of the proposed high pressure EOS experiment (ALT-3).
Experimental study of the MHD flow in a prototypic inlet manifold section of the DCLL blanket
Abdou, Mohamed
. The MHD flow patterns and their associated transport properties that result from the interaction between Lithium (DCLL) blanket concept. A series of experiments is carried out in order to understand stacked in the direction the magnetic field lines. For values of the interaction parameter , the flow
Flow and sediment processes in a cutoff meander of the Danube Delta during episodic flooding
Flow and sediment processes in a cutoff meander of the Danube Delta during episodic flooding Laura as sediment storage locations, essentially removing channel and point bar sediments from the active sediment) in order to investigate the distribution of the flow and sediment and his impact on sedimentation
Asymptotical Computations for a Model of Flow in Saturated Porous Media
WeinmÃ¼ller, Ewa B.
a variably saturated porous medium with exponential diffusivity, such as soil, rock or concrete is given by uAsymptotical Computations for a Model of Flow in Saturated Porous Media P. Amodio a , C.J. Budd b for an implicit second order ordinary differential equation which arises in models of flow in saturated porous
Y. Wu
2004-11-01T23:59:59.000Z
The purpose of this report is to document the unsaturated zone (UZ) flow models and submodels, as well as the flow fields that have been generated using the UZ flow model(s) of Yucca Mountain, Nevada. In this report, the term ''UZ model'' refers to the UZ flow model and the several submodels, which include tracer transport, temperature or ambient geothermal, pneumatic or gas flow, and geochemistry (chloride, calcite, and strontium) submodels. The term UZ flow model refers to the three-dimensional models used for calibration and simulation of UZ flow fields. This work was planned in the ''Technical Work Plan (TWP) for: Unsaturated Zone Flow Analysis and Model Report Integration'' (BSC 2004 [DIRS 169654], Section 1.2.7). The table of included Features, Events, and Processes (FEPs), Table 6.2-11, is different from the list of included FEPs assigned to this report in the ''Technical Work Plan for: Unsaturated Zone Flow Analysis and Model Report Integration'' (BSC 2004 [DIRS 169654], Table 2.1.5-1), as discussed in Section 6.2.6. The UZ model has revised, updated, and enhanced the previous UZ model (BSC 2001 [DIRS 158726]) by incorporating the repository design with new grids, recalibration of property sets, and more comprehensive validation effort. The flow fields describe fracture-fracture, matrix-matrix, and fracture-matrix liquid flow rates, and their spatial distributions as well as moisture conditions in the UZ system. These three-dimensional UZ flow fields are used directly by Total System Performance Assessment (TSPA). The model and submodels evaluate important hydrogeologic processes in the UZ as well as geochemistry and geothermal conditions. These provide the necessary framework to test hypotheses of flow and transport at different scales, and predict flow and transport behavior under a variety of climatic conditions. In addition, the limitations of the UZ model are discussed in Section 8.11.
Antonio Leon
2006-08-14T23:59:59.000Z
Hilbert's machine is a supertask machine inspired by Hilbert's Hotel whose functioning leads to a contradictory result involving w-ordering.
Intertwined Orders in High Temperature Superconductors
Ostoja-Starzewski, Martin
Intertwined Orders in High Temperature Superconductors ! Eduardo Fradkin University of Illinois Â· Electronic liquid crystal phases have also been seen heavy fermions and iron superconductors 7 #12
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.
Second Order Geodesic Corrections to Cosmic Shear
S. Dodelson; E. W. Kolb; S. Matarrese; A. Riotto; P. Zhang
2005-03-07T23:59:59.000Z
We consider the impact of second order corrections to the geodesic equation governing gravitational lensing. We start from the full second order metric, including scalar, vector and tensor perturbations, and retain all relevant contributions to the cosmic shear corrections that are second order in the gravitational potential. The relevant terms are: the nonlinear evolution of the scalar gravitational potential, the Born correction, and lens-lens coupling. No other second order terms contribute appreciably to the lensing signal. Since ray-tracing algorithims currently include these three effects, this derivation serves as rigorous justification for the numerical predictions.
High-Order Energy Stable WENO Schemes
A third-order Energy Stable Weighted Essentially Non--Oscillatory (ESWENO) finite difference scheme developed by the authors of the paper [N. K. Yamaleev ...
Ordered nanostructures through colloidal self assembly.
Koh, Yaw Koon.
2008-01-01T23:59:59.000Z
??The fabrication of ordered nanostructures plays an important role in the realization of the potential of nanotechnology and consequently, it has become an intense field… (more)
Numerical simulation of laminar flow in a curved duct
Lopez, A.R.; Oberkampf, W.L.
1995-01-01T23:59:59.000Z
This paper describes numerical simulations that were performed to study laminar flow through a square duct with a 900 bend. The purpose of this work was two fold. First, an improved understanding was desired of the flow physics involved in the generation of secondary vortical flows in three-dimensions. Second, adaptive gridding techniques for structured grids in three- dimensions were investigated for the purpose of determining their utility in low Reynolds number, incompressible flows. It was also of interest to validate the commercial computer code CFD-ACE. Velocity predictions for both non-adaptive and adaptive grids are compared with experimental data. Flow visualization was used to examine the characteristics of the flow though the curved duct in order to better understand the viscous flow physics of this problem. Generally, moderate agreement with the experimental data was found but shortcomings in the experiment were demonstrated. The adaptive grids did not produce the same level of accuracy as the non-adaptive grid with a factor of four more grid points.
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.
Rider, Robert L. (Walkersville, MD)
1980-01-01T23:59:59.000Z
A valve for diverting flow from the center of two concentric tubes to the annulus between the tubes or, operating in the reverse direction, for mixing fluids from concentric tubes into a common tube and for controlling the volume ratio of said flow consists of a toroidal baffle disposed in sliding engagement with the interior of the inner tube downstream of a plurality of ports in the inner tube, a plurality of gates in sliding engagement with the interior of the inner tube attached to the baffle for movement therewith, a servomotor having a bullet-shaped plug on the downstream end thereof, and drive rods connecting the servomotor to the toroidal baffle, the servomotor thereby being adapted to move the baffle into mating engagement with the bullet-shaped plug and simultaneously move the gates away from the ports in the inner tube and to move the baffle away from the bullet-shaped plug and simultaneously move the gates to cover the ports in the inner tube.
THE TUKEY ORDER FOR GRAPHS 1. Introduction
Nyikos, Peter J.
THE TUKEY ORDER FOR GRAPHS 1. Introduction Given a graph G, we let VG stand for the vertex set of G. For graphs G without isolated vertices, the Tukey order can be characterized thus: () G H iff there exist) is called a (generalized) Galois-Tukey connection (abbreviated GT-connection) from R to S if the following
Sandholm, Tuomas W.
the order of universal quantifiers does not change the meaning: (Ax)(Ay)P(x,y) is logically equivalent of universals and existentials does change meaning: -- Everyone likes someone: (Ax)(Ey)likes(x,y) -- SomeoneFirstÂOrder Logic (FOL) aka. predicate calculus Tuomas Sandholm CarnegieMellon University Computer
Constraints on topological order in Mott Insulators
Michael P. Zaletel; Ashvin Vishwanath
2015-04-18T23:59:59.000Z
We point out certain symmetry induced constraints on topological order in Mott Insulators (quantum magnets with an odd number of spin $\\tfrac{1}{2}$ per unit cell). We show, for example, that the double semion topological order is incompatible with time reversal and translation symmetry in Mott insulators. This sharpens the Hastings-Oshikawa-Lieb-Schultz-Mattis theorem for 2D quantum magnets, which guarantees that a fully symmetric gapped Mott insulator must be topologically ordered, but is silent on which topological order is permitted. An application of our result is the Kagome lattice quantum antiferromagnet where recent numerical calculations of entanglement entropy indicate a ground state compatible with either toric code or double semion topological order. Our result rules out the latter possibility.
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.
Differential probes aid flow measurement
Mesnard, D.R.
1982-07-01T23:59:59.000Z
Nonconstricting differential pressure flow probes which help solve the problems of clogging, wear, and pressure loss at the Seawater Filtration Facility in Saudi Arabia are described. Treated seawater is pumped into oil-bearing formations for secondary recovery. Figures showing principle of operation for probes, installation schematic and long-term accuracy results (flow probes vs. orifice meters) are presented. The new diamond-shaped design flow sensor offers accurate flow measurement with low permanent pressure loss, which translates into cost savings for the operator.
Simulations of Turbulent Flows with Strong Shocks and Density Variations
Zhong, Xiaolin
2012-12-13T23:59:59.000Z
In this report, we present the research efforts made by our group at UCLA in the SciDAC project Ã?Â?Ã?Â¢Ã?Â?Ã?Â?Ã?Â?Ã?Â?Simulations of turbulent flows with strong shocks and density variationsÃ?Â?Ã?Â¢Ã?Â?Ã?Â?Ã?Â?Ã?Â. We use shock-fitting methodologies as an alternative to shock-capturing schemes for the problems where a well defined shock is present. In past five years, we have focused on development of high-order shock-fitting Navier-Stokes solvers for perfect gas flow and thermochemical non-equilibrium flow and simulation of shock-turbulence interaction physics for very strong shocks. Such simulation has not been possible before because the limitation of conventional shock capturing methods. The limitation of shock Mach number is removed by using our high-order shock-fitting scheme. With the help of DOE and TeraGrid/XSEDE super computing resources, we have obtained new results which show new trends of turbulence statistics behind the shock which were not known before. Moreover, we are also developing tools to consider multi-species non-equilibrium flows. The main results are in three areas: (1) development of high-order shock-fitting scheme for perfect gas flow, (2) Direct Numerical Simulation (DNS) of interaction of realistic turbulence with moderate to very strong shocks using super computing resources, and (3) development and implementation of models for computation of mutli-species non-quilibrium flows with shock-fitting codes.
Section 11: Interfacial flows 1 Section 11: Interfacial flows
Kohlenbach, Ulrich
Abstract 15:10 Â 15:30: Martin LÃ¼bke, Olaf WÃ¼nsch (UniversitÃ¤t Kassel): Two-Phase Flow in Single- Screw Extruders Abstract S11.4: Capillary Flows Wed, 16:00Â18:00 Chair: Dieter Bothe S1|03Â123 16:00 Â 16:20: K
Analysis of flow patterns and flow mechanisms in soils
Avignon et des Pays de Vaucluse, UniversitÃ© de
Analysis of flow patterns and flow mechanisms in soils Dissertation Co-directed by the University mechanism or changing soil physical properties (stratification). Thus, in stratified soil, we restricted was prepared at the Department of Soil Physics, University of Bayreuth, and at the Hydrogeological Laboratory
Effect of flow fluctuations and nonflow on elliptic flow methods
Ollitrault, Jean-Yves; Poskanzer, Arthur M.; Voloshin, Sergei A.
2009-04-16T23:59:59.000Z
We discuss how the different estimates of elliptic flow are influenced by flow fluctuations and nonflow effects. It is explained why the event-plane method yields estimates between the two-particle correlation methods and the multiparticle correlation methods. It is argued that nonflow effects and fluctuations cannot be disentangled without other assumptions. However, we provide equations where, with reasonable assumptions about fluctuations and nonflow, all measured values of elliptic flow converge to a unique mean v_2,PP elliptic flow in the participant plane and, with a Gaussian assumption on eccentricity fluctuations, can be converted to the mean v_2,RP in the reaction plane. Thus, the 20percent spread in observed elliptic flow measurements from different analysis methods is no longer mysterious.
National Comfort Products: Order (2010-SE-0307)
Broader source: Energy.gov [DOE]
DOE ordered National Comfort Products to pay an $8,000 civil penalty after finding NCP had failed to conduct the required testing to certify that certain models of central air conditioners comply with the applicable energy conservation standard.
Minka-Aire: Order (2014-CE-32018)
Broader source: Energy.gov [DOE]
DOE ordered Minka Lighting Inc. to pay a $8,000 civil penalty after finding Minka had failed to certify that certain models of ceiling fans comply with the applicable energy 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.
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.
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.
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.
Polar King: Order (2013-CE-5328)
Broader source: Energy.gov [DOE]
DOE ordered Polar King International Inc. to pay a $8,000 civil penalty after finding Polar King had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Goodman Manufacturing: Order (2012-CE-1509)
Broader source: Energy.gov [DOE]
DOE ordered Goodman Manufacturing Company L.P. to pay an $8,000 civil penalty after finding Goodman Manufacturing had failed to certify that certain room air conditioners comply with the applicable energy 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.
Order-Sorted Dependency Pairs Salvador Lucas
Lucas, Salvador
Order-Sorted Dependency Pairs Salvador Lucas DSIC, Universidad PolitÂ´ecnica de Valencia, Spain modeled as many-sorted or, more Salvador Lucas was partially supported by the EU (FEDER) and the Spanish
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.
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...
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.
On perfect order subsets in finite groups
Tuan, Nguyen Trong
2010-01-01T23:59:59.000Z
If $G$ is a finite group and $x\\in G$ then the set of all elements of $G$ having the same order as $x$ is called {\\em an order subset of $G$ determined by $x$} (see [2]). We say that $G$ is a {\\em group with perfect order subsets} or briefly, $G$ is a {\\em $POS$-group} if the number of elements in each order subset of $G$ is a divisor of $|G|$. In this paper we prove that for any $n\\geq 4$, the symmetric group $S_n$ is not $POS$-group. This gives the positive answer to one of two questions rising from Conjecture 5.2 in [3].
Fagor America: Order (2013-CEW-19001)
Broader source: Energy.gov [DOE]
DOE ordered Fagor America, Inc. to pay a $13,000 civil penalty after finding Fagor America had failed to certify that certain models of residential refrigerator-freezers and dishwashers comply with the applicable energy and water conservation standards.
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.
Barclay Products: Order (2013-CW-3005)
Broader source: Energy.gov [DOE]
DOE ordered Barclay Products, Ltd. to pay a $8,000 civil penalty after finding Barclay Products had failed to certify that certain models of water closets comply with the applicable water conservation standards.
Commercial Cooler: Order (2013-CE-5343)
Broader source: Energy.gov [DOE]
DOE ordered Commercial Cooler, Inc. to pay a $8,000 civil penalty after finding Commercial Cooler had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Southeast Cooler: Order (2013-CE-5331)
Broader source: Energy.gov [DOE]
DOE ordered Southeast Cooler Corp. to pay a $8,000 civil penalty after finding Southeast Cooler had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Golden Cooler: Order (2013-CE-5345)
Broader source: Energy.gov [DOE]
DOE ordered Golden Cooler to pay a $8,000 civil penalty after finding Golden Cooler had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Custom Coolers: Order (2013-CE-5315)
Broader source: Energy.gov [DOE]
DOE ordered Custom Coolers, LLC to pay a $8,000 civil penalty after finding Custom Coolers had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Topstar International: Order (2011-CE-2703)
Broader source: Energy.gov [DOE]
DOE ordered Topstar International, Inc. to pay a $6,000 civil penalty after finding Topstar International had failed to certify that certain models of incandescent reflector lamps comply with the applicable energy conservation standards.
Broader source: Energy.gov [DOE]
DOE ordered EiKO Ltd. - North America to pay a $6,000 civil penalty after finding EiKO had failed to certify that certain models of incandescent reflector lamps comply with the applicable energy conservation standards.
National Comfort Products: Order (2014-SE-16014)
Broader source: Energy.gov [DOE]
DOE ordered National Comfort Products to pay a $16,000 civil penalty after finding National Comfort Products had failed to certify that certain models of central air conditioners and heat pumps 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.
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 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.
Peerless-Premier: Order (2014-CE-23007)
Broader source: Energy.gov [DOE]
DOE ordered Peerless-Premier Appliance Co. to pay a $8,000 civil penalty after finding Peerless-Premier had failed to certify that certain models of cooking products comply with the applicable energy conservation standards.
Nostalgia Products: Order (2014-CE-14017)
Broader source: Energy.gov [DOE]
DOE ordered Nostalgia Products Group, LLC to pay a $8,000 civil penalty after finding Nostalgia Products had failed to certify that certain models of refrigerators and refrigerator-freezers comply with the applicable energy conservation standards.
MC Appliance: Order (2014-CE-20002)
Broader source: Energy.gov [DOE]
DOE ordered MC Appliance Corporation to pay a $16,000 civil penalty after finding MC Appliance had failed to certify that certain models of residential clothes washers and residential clothes dryers 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.
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.
Ordered bed modular reactor design proposal
Tian, J. [Inst. of Nuclear Energy Technology, Tsinghua Univ., Beijing 100084 (China)
2006-07-01T23:59:59.000Z
The Ordered Bed Modular Reactor (OBMR) is a design as an advanced modular HTGR in which the annular reactor core is filled with an ordered bed of fuel spheres. This arrangement allows fuel elements to be poured into the core cavity which is shaped so that an ordered bed is formed and to be discharged from the core through the opening holes in the reactor top. These operations can be performed in a shutdown shorter time. The OBMR has the most of advantages from both the pebble bed reactor and block type reactor. Its core has great structural flexibility and stability, which allow increasing reactor output power and outlet gas temperature as well as decreasing core pressure drop. This paper introduces ordered packing bed characteristics, unloading and loading technique of the fuel spheres and predicted design features of the OBMR. (authors)
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.
Mackle Company: Order (2010-SE-0106)
Broader source: Energy.gov [DOE]
DOE ordered Mackle Company, Inc. to pay a $27,200 civil penalty after finding the company had failed to certify that a variety of refrigerators, refrigerator-freezers, and freezers comply with the applicable energy conservation standards.
Hunter Fan: Order (2014-CE-32008)
Broader source: Energy.gov [DOE]
DOE ordered Hunter Fan Company to pay a $8,000 civil penalty after finding Hunter Fan had failed to certify that certain models of ceiling fans comply with the applicable energy conservation standards.
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.
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.
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.
The planar X-junction flow: stability analysis and control
Lashgari, Iman; Tammisola, Outi; Citro, Vincenzo; Juniper, Matthew P.; Brandt, Luca
2014-07-29T23:59:59.000Z
and ? is the kinematic viscosity. The velocity ratio is defined as Vr = U2 U1 , (2.2) where U2 is the maximum inflow velocity of the side channels. In this paper, we study the stability of the X-junction flow in the Reynolds number regime 60 waves, and the lift-up effect. To determine the instability mechanism in our flow, we note that the present instability is stationary, the mode shape streamwise elon- gated, and the streamwise velocity component order of magnitude larger than...
Propagation Plane waves -High order Modes
Berlin,Technische UniversitÃ¤t
1 Propagation Â· Plane waves - High order Modes y x a One wave: p(x,y,t)=p0 cos(k y)e-jk x e j t vy(y,t)= 0 ; y=0,a xy } ky = n a Propagation Â· Plane waves - High order Modes x n a p(x,y,t)=pn cos( y + - +- + + - +- + - + + +- - - (m,n) #12;4 Propagation Â· Circular duct Â Helical waves (spiralling waves) kc=m/a kz k
Propagation Plane waves -High order Modes
Berlin,Technische UniversitÃ¤t
1 Propagation Â· Plane waves - High order Modes y x a ky = n a One wave: p(x,y,t)=p0 cos(k y)e-jk x e j t vy(y,t)= 0 ; y=0,a xy } Propagation Â· Plane waves - High order Modes x n a p(x,y,t)=pn cos( y;4 Propagation Â· Circular duct Â Helical waves (spiralling waves) kc=m/a kz kH Projection: Propagation #12
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
The magnetic flywheel flow meter: Theoretical and experimental contributions
Buchenau, D., E-mail: d.buchenau@hzdr.de; Galindo, V.; Eckert, S. [Helmholtz-Zentrum Dresden-Rossendorf, Institute of Fluid Dynamics, Bautzner Landstraße 400, 01328 Dresden (Germany)
2014-06-02T23:59:59.000Z
The development of contactless flow meters is an important issue for monitoring and controlling of processes in different application fields, like metallurgy, liquid metal casting, or cooling systems for nuclear reactors and transmutation machines. Shercliff described in his book “The Theory of Electromagnetic Flow Measurement, Cambridge University Press, 1962” a simple and robust device for contact-less measurements of liquid metal flow rates which is known as magnetic flywheel. The sensor consists of several permanent magnets attached on a rotatable soft iron plate. This arrangement will be placed closely to the liquid metal flow to be measured, so that the field of the permanent magnets penetrates into the fluid volume. The flywheel will be accelerated by a Lorentz force arising from the interaction between the magnetic field and the moving liquid. Steady rotation rates of the flywheel can be taken as a measure for the mean flow rate inside the fluid channel. The present paper provides a detailed theoretical description of the sensor in order to gain a better insight into the functional principle of the magnetic flywheel. Theoretical predictions are confirmed by corresponding laboratory experiments. For that purpose, a laboratory model of such a flow meter was built and tested on a GaInSn-loop under various test conditions.
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.
Membranes and separators for flowing electrolyte batteries-a review
Arnold, C.; Assink, R.A.
1983-01-01T23:59:59.000Z
Flowing electrolyte batteries are rechargeable electrochemical storage devices in which externally stored electrolytes are circulated through the cell stack during charge or discharge. The potential advantages that flow batteries offer compared to other secondary batteries include: 1) ease of thermal and electrolyte management, 2) simple electrochemistry, 3) deep cycling capability, and 4) minimal loss of capacity with cycling. However, flow batteries are more complex than other secondary batteries and consequently may cost more and may be less reliable. Flow batteries are being developed for utility load leveling, electric vehicles, solar photovoltaic and wind turbine application. The status of flow batteries has recently been reviewed by Clark et al. The flowing electrolyte batteries place rigorous demands on the performance of separators and membranes. The operating characteristics of the iron/chromium redox battery were changed in order to accommodate the limitations in membrane performance. Low cost alternatives to the presently used membrane must be found before the zinc/ferricyanide battery can be economically feasible. The zinc/bromine battery's efficiency could be improved if a suitably selective membrane were available. It is anticipated that better and less costly membranes to meet these needs will be developed as more is learned about their preparation and performance.
Network Flow Optimization under Uncertainty
Tesfatsion, Leigh
Network model in words Minimize the cost of satisfying demands for electric energy By: imports, exports and electricity Subject to: conservation of energy flows (net after losses), lower and upper bounds on flows is a reactive approach: how would the optimal solution have changed if I'd only known? Â· Proactive approaches
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.
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, 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.
Analytical and numerical Gubser solutions of the second-order hydrodynamics
Long-Gang Pang; Yoshitaka Hatta; Xin-Nian Wang; Bo-Wen Xiao
2014-12-10T23:59:59.000Z
Evolution of quark-gluon plasma (QGP) near equilibrium can be described by the second-order relativistic viscous hydrodynamic equations. Consistent and analytically verifiable numerical solutions are critical for phenomenological studies of the collective behavior of QGP in high-energy heavy-ion collisions. A novel analytical solution based on the conformal Gubser flow which is a boost-invariant solution with transverse fluid velocity is presented. It is used to verify with high precision the numerical solution with a newly developed $(3+1)$-dimensional second-order viscous hydro code (CLVisc). The perfect agreement between the analytical and numerical solutions demonstrates the reliability of the numerical simulations with the second-order viscous corrections. This lays the foundation for future phenomenological studies that allow one to gain access to the second-order transport coefficients.
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.
Shull, Kenneth R.
Close Order, Inventory, Recycle Non-Preferred Vendor/Non-Catalog REQuisition Approver(s) receive or service by an external company For purchases of goods over $5000, follow inventory process Ready to dispose or recycle? See Equipment Inventory & Disposal policy Yes Requestor creates a non
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.
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.
An order-theoretic quantification of contextuality
Ian T. Durham
2014-09-23T23:59:59.000Z
In this essay, I develop order-theoretic notions of determinism and contextuality on domains and topoi. In the process, I develop a method for quantifying contextuality and show that the order-theoretic sense of contextuality is analogous to the sense embodied in the topos-theoretic statement of the Kochen-Specker theorem. Additionally, I argue that this leads to a relation between the entropy associated with measurements on quantum systems and the second law of thermodynamics. The idea that the second law has its origin in the ordering of quantum states and processes dates to at least 1958 and possibly earlier. The suggestion that the mechanism behind this relation is contextuality, is made here for the first time.
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.
Filiform Lie algebras of order 3
Rosa Navarro
2014-04-03T23:59:59.000Z
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 (Vergne, 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.
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.
Smectic Order in Double-Twist Cylinders
Randall D. Kamien
1996-11-04T23:59:59.000Z
I propose a double-twist texture with local smectic order, which may have been seen in recent experiments. As in the Renn-Lubensky TGB phase, the smectic order is broken only through a lattice of screw dislocations. A melted lattice of screw dislocations can produce a double-twist texture as can an unmelted lattice. In the latter case I show that geometry only allows for certain angles between smectic regions. I discuss the possibility of connecting these double-twist tubes together to form a smectic blue phase.
Representations of the groups of order 64
Hansen, Roger Finn
1967-01-01T23:59:59.000Z
-seven groups of order 64 are divided into twenty-seven families, . The families are denoted by 0, i = 1 2, . . . , 27. 1 Definition 2. 9. Two groups belong to the same ~famil if they are isoclinic. Definition 2. 10. The groups of lowest order in a family.... Then Z (G) = C 0( C and G/Z (G) = 16 I'2 al. As in the previous example G/2 (G) consists of the following cosets: g ' = (1, 2, 3, 4) g ' = (5678) 16' = (61, 62, 63, 64) 15 The following table was calculated using a representative ele- ment from...
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 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.
Turbulence transition and the edge of chaos in pipe flow
Tobias M Schneider; Bruno Eckhardt; James A Yorke
2007-03-30T23:59:59.000Z
The linear stability of pipe flow implies that only perturbations of sufficient strength will trigger the transition to turbulence. In order to determine this threshold in perturbation amplitude we study the \\emph{edge of chaos} which separates perturbations that decay towards the laminar profile and perturbations that trigger turbulence. Using the lifetime as an indicator and methods developed in (Skufca et al, Phys. Rev. Lett. {\\bf 96}, 174101 (2006)) we show that superimposed on an overall $1/\\Re$-scaling predicted and studied previously there are small, non-monotonic variations reflecting folds in the edge of chaos. By tracing the motion in the edge we find that it is formed by the stable manifold of a unique flow field that is dominated by a pair of downstream vortices, asymmetrically placed towards the wall. The flow field that generates the edge of chaos shows intrinsic chaotic dynamics.
Plastic flow of foams and emulsions in a channel
Dollet, B; Sbragaglia, M
2014-01-01T23:59:59.000Z
In order to understand the flow profiles of complex fluids, a crucial issue concerns the emergence of spatial correlations among plastic rearrangements exhibiting cooperativity flow behaviour at the macroscopic level. In this paper, the rate of plastic events in a Poiseuille flow is experimentally measured on a confined foam in a Hele-Shaw geometry. The correlation with independently measured velocity profiles is quantified. To go beyond a limitation of the experiments, namely the presence of wall friction which complicates the relation between shear stress and shear rate, we compare the experiments with simulations of emulsion droplets based on the lattice-Boltzmann method, which are performed both with, and without, wall friction. Our results indicate a correlation between the localisation length of the velocity profiles and the localisation length of the number of plastic events. Finally, unprecedented results on the distribution of the orientation of plastic events show that there is a non-trivial correla...
Lumiram Electric: Order (2010-CE-1014) | Department of Energy
Broader source: Energy.gov (indexed) [DOE]
Lumiram Electric: Order (2010-CE-1014) Lumiram Electric: Order (2010-CE-1014) November 23, 2010 DOE issued an Order and entered into a Compromise Agreement with Lumiram Electric...
Multiscale Simulations for Polymeric Flow
Takahiro Murashima; Takashi Taniguchi; Ryoichi Yamamoto; Shugo Yasuda
2011-01-06T23:59:59.000Z
Multiscale simulation methods have been developed based on the local stress sampling strategy and applied to three flow problems with different difficulty levels: (a) general flow problems of simple fluids, (b) parallel (one-dimensional) flow problems of polymeric liquids, and (c) general (two- or three-dimensional) flow problems of polymeric liquids. In our multiscale methods, the local stress of each fluid element is calculated directly by performing microscopic or mesoscopic simulations according to the local flow quantities instead of using any constitutive relations. For simple fluids (a), such as the Lenard-Jones liquid, a multiscale method combining MD and CFD simulations is developed based on the local equilibrium assumption without memories of the flow history. (b), the multiscale method is extended to take into account the memory effects that arise in hydrodynamic stress due to the slow relaxation of polymer-chain conformations. The memory of polymer dynamics on each fluid element is thus resolved by performing MD simulations in which cells are fixed at the mesh nodes of the CFD simulations.For general (two- or three-dimensional) flow problems of polymeric liquids (c), it is necessary to trace the history of microscopic information such as polymer-chain conformation, which carries the memories of past flow history, along the streamline of each fluid element. A Lagrangian-based CFD is thus implemented to correctly advect the polymer-chain conformation consistently with the flow. On each fluid element, coarse-grained polymer simulations are carried out to consider the dynamics of entangled polymer chains that show extremely slow relaxation compared to microscopic time scales.
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 ...
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.
Tivanov, G.; Rom, J. [Technion-Israel Inst. of Tech., Haifa (Israel)] [Technion-Israel Inst. of Tech., Haifa (Israel)
1995-12-01T23:59:59.000Z
The stability characteristics of the reacting hypersonic flow of the fuel/oxidizer mixture in the stagnation region of a blunt body are studied. The conditions for oscillations of the combustion front are assumed to be determined mainly by the flow conditions at the stagnation region. The density at the stagnation region is assumed to be constant at hypersonic flow conditions. By assuming a simplified flow model, the time dependent flow equations, including the heat addition due to the chemical reactions, are reduced to a second-order nonlinear differential equation for the instantaneous temperature. The solutions are analyzed assuming a one-step chemical reaction with zero-order and first-order processes using dynamical systems methods. These methods are used to determine the stability boundaries in terms of the flow and chemical reaction parameters. It is shown that the zero-order reaction has nonperiodic solutions that may lead to explosion whereas the first-order and higher-order reactions may have periodic solutions indicating oscillations. The zero-order analysis also reaffirms the requirements for a minimum size blunt body for the establishment of a detonation (in agreement with classical detonation theory) and the first-order analysis indicates a minimum body size for establishment of oscillations. The oscillation frequencies are calculated using the small perturbation approximation for the temperature oscillations. These frequencies are compared with results from published data on spheres and hemisphere cylindrical bodies fired into hydrogen-oxygen and acetylene oxygen mixtures. Very good agreement is found between the measured and calculated results.
Gas flow characterization of restrictive flow orifice devices
Shrouf, R.G. [Sandia National Labs., Albuquerque, NM (United States). Safety Engineering Dept.; Page, S.R. [Albuquerque Valve and Fitting Co., NM (United States)
1997-07-01T23:59:59.000Z
A restrictive flow orifice (RFO) can be used to limit the uncontrolled release of system media upon component or line failure in a gas handling system and can thereby enhance the system safety. This report describes a new RFO product available from the Swagelok Companies and specifies the gas flow characteristics of this device. A family of four different sizes of RFO devices is documented.
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.
Topological Order in Frustrated Josephson Junction Arrays
M. C. Diamantini; P. Sodano; C. A. Trugenberger
2008-06-02T23:59:59.000Z
We show that electrically and magnetically frustrated Josephson junction arrays (JJAs) realize topological order with a non-trivial ground state degeneracy on manifolds with non-trivial topology. The low-energy theory has the same gauge dynamics of the unfrustrated JJAs but for different, "fractional" degrees of freedom, a principle reminescent of Jain's composite electrons in the fractional quantum Hall effect.
Sanner, Scott
, truck2}, City = {paris, berlin, rome} Â· Ground Fluents(i.e., binary statevariables): Â BoxIn: {BoxFirst-order MDPs Scott Sanner NICTA / ANU Motivation #12;FOMDP Tutorial Outline Â· Motivation... Â Refer to relational fluents: Â· e.g., BIn(?b,?c), OnTable(?b) Â· specify relations between objects
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.
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.
Side Orders Potato Wedges 1.60
Dixon, Peter
Side Orders Potato Wedges Â£1.60 Choose your dip from: Soured Cream, Spicy Salsa or Barbecue Potato Wedges topped with Cheese Â£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 Â£5.25 Refried beans, onions
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.
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.
General Restaurant Equipment: Order (2013-CE-5344)
Broader source: Energy.gov [DOE]
DOE ordered General Restaurant Equipment Co. to pay a $8,000 civil penalty after finding General Restaurant Equipment had failed to certify that certain models of walk-in cooler and freezer components comply with the applicable energy conservation standards.
Metl-Span: Order (2013-CE-5352)
Broader source: Energy.gov [DOE]
DOE ordered Metl-Span LLC to pay a $8,000 civil penalty after finding Metl-Span had failed to certify that any basic models of walk-in cooler and freezer components 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.
Matthews Fan: Order (2014-CE-32012)
Broader source: Energy.gov [DOE]
DOE ordered Matthews-Gerbar, Ltd. d/b/a Matthews Fan Company to pay a $8,000 civil penalty after finding Matthews had failed to certify that certain models of ceiling fans 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.
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.
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.
On Programs with Linearly Ordered Multiple Preferences
Vermeir, Dirk
programs allows for the defeat of rules to resolve contradictions. We propose a refinement of these se the following extended answer sets: N 1 = {local , politics} N 2 = {local , sports} N 3 = {national , economy} N 4 = {international , economy} . The redaction wishes to order them according to their preferences
Numerical study of the effects of upstream flow condition upon orifice flow meter performance
Morrison, G.L.; Panak, D.L.; DeOtte, R.E. Jr. (Texas A and M Univ., College Station, TX (United States). Mechanical Engineering Dept.)
1993-11-01T23:59:59.000Z
Recent experimental work has shown that when the mean velocity profile upstream of an orifice plate has a deficit on the centerline and higher velocities at the outer edges of the pipe, the pressure drop across the orifice is greater than if the flow upstream is fully developed. It is proposed that this increase in [Delta]P is directly correlated with the radial distribution of momentum upstream of the orifice plate. In an effort to investigate how the upstream flow condition affects the pressure distribution along the pipe wall and to determine if the hypothesis is correct, Creare.X Inc. 's FLUENT numerical analysis program was used to simulate the effects. Two [beta] ratios (0.50 and 0.75) have been considered with various mean velocity inlet profiles. Inlet profiles include the 1/16th, 1/7th, 1/8th, 1/9th and 1/10th power law power law, uniform flow, and two linear distributions. The results indicate that there is a correlation between the second and third-order moments of momentum and the value of the discharge coefficient. This empirical correlation, after being fully verified by experimental data, can be used to estimate the change in the coefficient of discharge given the inlet velocity profile.
Wessels, J.P.; Zhang, Yingchao; E877 Collaboration
1994-12-31T23:59:59.000Z
We have employed the nearly 4{pi}-calorimetric coverage of the E877 apparatus in order to determine flow in different regions of pseudo-rapidity from the measured transverse energy in Au+Au collisions at 11.4 A{center_dot}GeV/c. Signatures for the side-splash in the reaction plane at forward and backward rapidities have been established. Indications of a non-zero eccentricity of particles in the reaction plane at mid-rapidity are also found. These observations complement analyses deriving collective longitudinal motion from dN/dy-spectra of protons, kaons, and pions as well as collective transverse motion of the same particles from m{sub t}-spectra at midrapidity.
Centrality dependence of elliptic flow and QGP viscosity
A. K. Chaudhuri
2010-03-30T23:59:59.000Z
In the Israel-Stewart's theory of second order hydrodynamics, we have analysed the recent PHENIX data on charged particles elliptic flow in Au+Au collisions. PHENIX data demand more viscous fluid in peripheral collisions than in central collisions. Over a broad range of collision centrality (0-10%- 50-60%), viscosity to entropy ratio ($\\eta/s$) varies between 0-0.17.
VISCOUS CORRECTIONNS TO SPECTRA, ELLIPTIC FLOW, AND HBT RADII.
TEANEY,D.
2002-07-18T23:59:59.000Z
I compute the first viscous correction to the thermal distribution function. With this correction, I calculate the effect of viscosity on spectra, elliptic flow, and HBT radii. Indicating the breakdown of hydrodynamics, viscous corrections become of order one for 1.5GeV. Viscous corrections to HBT radii are particularly large and reduce the outward and longitudinal radii. This reduction is a direct consequence of the reduction in longitudinal pressure.
Decay of swirl in turbulent two phase flow
Neeley, Patrick Foster
2012-06-07T23:59:59.000Z
decrease in Reynolds number. Also, it was found that within experimental accuracy the decay was independent of initial swirl intensity. Their theoretical analysis of swirl decay characteristics in turbulent flow and the experiments conducted were... concentrations of the Polyox were put into the water in a uniform procedure in order to obtain consist. ent results. A venturi mixer was designed and used to di perse the polymer particles into the water in the mixing tank. The vigorous stir- ring bv the jet...
Order acceptance and scheduling at a make-to-order system using revenue management
Jalora, Anshu
2006-10-30T23:59:59.000Z
opportunity cost for processing the order. Discrete time formulations based on stochastic dynamic programming (SDP) approach are common in RM literature [14]. The way this approach is executed is as follows. Under the assumptions of a Poisson arrival process... is rejected and is 21 accepted is compared with the profits earned by processing the order at hand. If the comparison is in favor of the order, the order is accepted, otherwise it is rejected. Following this general approach, we develop SDP formulation for our...
Capillary flows in flexible structures
Hoberg, Theresa B. (Theresa Blinn)
2013-01-01T23:59:59.000Z
Interactions between capillary and elastic effects are relevant to a variety of applications, from micro- and nano-scale manufacturing to biological systems. In this thesis, we investigate capillary flows in extremely ...
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.
particle flow for nonlinear filters
Dobigeon, Nicolas
particle flow for nonlinear filters Fred Daum 19 June 2012 Copyright Â© 2012 Raytheon Company. All rights reserved. Customer Success Is Our Mission is a trademark of Raytheon Company. 1 #12;discrete time
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, ...
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 ...
Cahn, Robert N.
2010-01-01T23:59:59.000Z
Field Flows of Dark Energy Robert N. Cahn, Roland de Putter,July 8, 2008) Scalar ?eld dark energy evolving from a longthe key aspects of the dark energy evolution during much of
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 ...
Clement, Prabhakar
numbers #12;Pipe Flow System Form #12;Components Form Fitting Loss Coefficient, k Globe valve, fully open 10 Angle valve, fully open 5 Swing check valve, fully open 2.5 Gate valve, fully open .2 Shortradius
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 ...
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 ...
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...
Automation of radiochemical analysis by applying flow
Sánchez, David
of detection systems, including scintillation counting, a-spectrometers, proportional counters, mass spectrometry and spectrophotometry. ª 2010 Published by Elsevier Ltd. Keywords: Flow-analysis technique; Flow
MODERN DEVELOPMENTS IN MULTIPHASE FLOW & HEAT TRANSFER
Lahey, Richard T.
MODERN DEVELOPMENTS IN MULTIPHASE FLOW & HEAT TRANSFER "ENGINEERING APPLICATIONS OF FRACTAL and multiphase flow & heat transfer will be stressed. This paper will begin by reviewing some important concepts
Colorado: Isothermal Battery Calorimeter Quantifies Heat Flow...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Isothermal Battery Calorimeter Quantifies Heat Flow, Helps Make Safer, Longer-lasting Batteries Colorado: Isothermal Battery Calorimeter Quantifies Heat Flow, Helps Make Safer,...
Equidistribution results for geodesic flows
Abdelhamid Amroun
2011-09-15T23:59:59.000Z
Using the works of Ma\\~n\\'e \\cite{Ma} and Paternain \\cite{Pat} we study the distribution of geodesic arcs with respect to equilibrium states of the geodesic flow on a closed manifold, equipped with a $\\mathcal{C}^{\\infty}$ Riemannian metric. We prove large deviations lower and upper bounds and a contraction principle for the geodesic flow in the space of probability measures of the unit tangent bundle. We deduce a way of approximating equilibrium states for continuous potentials.
McManamay, Ryan A [ORNL; Bevelhimer, Mark S [ORNL; Frimpong, Dr. Emmanuel A, [Virginia Polytechnic Institute and State University
2014-01-01T23:59:59.000Z
Classification systems are valuable to ecological management in that they organize information into consolidated units thereby providing efficient means to achieve conservation objectives. Of the many ways classifications benefit management, hypothesis generation has been discussed as the most important. However, in order to provide templates for developing and testing ecologically relevant hypotheses, classifications created using environmental variables must be linked to ecological patterns. Herein, we develop associations between a recent US hydrologic classification and fish traits in order to form a template for generating flow ecology hypotheses and supporting environmental flow standard development. Tradeoffs in adaptive strategies for fish were observed across a spectrum of stable, perennial flow to unstable intermittent flow. In accordance with theory, periodic strategists were associated with stable, predictable flow, whereas opportunistic strategists were more affiliated with intermittent, variable flows. We developed linkages between the uniqueness of hydrologic character and ecological distinction among classes, which may translate into predictions between losses in hydrologic uniqueness and ecological community response. Comparisons of classification strength between hydrologic classifications and other frameworks suggested that spatially contiguous classifications with higher regionalization will tend to explain more variation in ecological patterns. Despite explaining less ecological variation than other frameworks, we contend that hydrologic classifications are still useful because they provide a conceptual linkage between hydrologic variation and ecological communities to support flow ecology relationships. Mechanistic associations among fish traits and hydrologic classes support the presumption that environmental flow standards should be developed uniquely for stream classes and ecological communities, therein.
Subcritical dynamos in shear flows
F. Rincon; G. I. Ogilvie; M. R. E. Proctor; C. Cossu
2008-05-09T23:59:59.000Z
Identifying generic physical mechanisms responsible for the generation of magnetic fields and turbulence in differentially rotating flows is fundamental to understand the dynamics of astrophysical objects such as accretion disks and stars. In this paper, we discuss the concept of subcritical dynamo action and its hydrodynamic analogue exemplified by the process of nonlinear transition to turbulence in non-rotating wall-bounded shear flows. To illustrate this idea, we describe some recent results on nonlinear hydrodynamic transition to turbulence and nonlinear dynamo action in rotating shear flows pertaining to the problem of turbulent angular momentum transport in accretion disks. We argue that this concept is very generic and should be applicable to many astrophysical problems involving a shear flow and non-axisymmetric instabilities of shear-induced axisymmetric toroidal velocity or magnetic fields, such as Kelvin-Helmholtz, magnetorotational, Tayler or global magnetoshear instabilities. In the light of several recent numerical results, we finally suggest that, similarly to a standard linear instability, subcritical MHD dynamo processes in high-Reynolds number shear flows could act as a large-scale driving mechanism of turbulent flows that would in turn generate an independent small-scale dynamo.
Implementation of Executive Order 13514, Federal Leadership in...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
of Executive Order 13514, Federal Leadership in Environmental, Energy, and Economic Performance Implementation of Executive Order 13514, Federal Leadership in...
Pressure and flow characteristics of restrictive flow orifice devices.
Shrouf, Roger D.
2003-06-01T23:59:59.000Z
A Restrictive Flow Orifice (RFO) can be used to enhance the safe design of a pressure system in several ways. Pressure systems frequently incorporate a regulator and relief valve to protect the downstream equipment from accidental overpressure caused by regulator failure. Analysis frequently shows that in cases of high-flow regulator failure, the downstream pressure may rise significantly above the set pressure of the relief valve. This is due to limited flow capacity of the relief valve. A different regulator or relief valve may need to be selected. A more economical solution to this problem is to use an RFO to limit the maximum system flow to acceptable limits within the flow capacity of the relief valve, thereby enhancing the overpressure protection of laboratory equipment. An RFO can also be used to limit the uncontrolled release of system fluid (gas or liquid) upon component or line failure. As an example, potential asphyxiation hazards resultant from the release of large volumes of inert gas from a 'house' nitrogen system can be controlled by the use of an RFO. This report describes a versatile new Sandia-designed RFO available from the Swagelok Company and specifies the gas flow characteristics of this device. Two sizes, 0.010 and 0.020 inch diameter RFOs are available. These sizes will allow enhanced safety for many common applications. This new RFO design are now commercially available and provide advantages over existing RFOs: a high pressure rating (6600 psig); flow through the RFO is equal for either forward or reverse directions; they minimize the potential for leakage by incorporating the highest quality threaded connections; and can enhance the safety of pressure systems.
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
Camci, Cengiz
DEVELOPMENT OF TIP CLEARANCE FLOW DOWNSTREAM OF A ROTOR BLADE WITH COOLANT INJECTION FROM A TIP Rotor blade height Um Mean wheel speed, i.e. midspan rotor speed Absolute flow angle measured from the nozzle guide vane and the rotor blade need to be cooled adequately in order to maintain the 1 #12
Paris-Sud XI, UniversitÃ© de
Piping flow erosion in water retaining structures: inferring erosion rates from hole erosion tests-en-Provence Cedex 5, France E-mail: stephane.bonelli@cemagref.fr Abstract The piping flow erosion process, involving structures. Such a pipe can be imputed to roots or burrows. The coefficient of erosion must be known in order
Large elliptic flow in low multiplicity pp collisions at LHC energy $\\sqrt{s}$=14 TeV
A. K. Chaudhuri
2010-06-25T23:59:59.000Z
We explore the possibility of observing elliptic flow in low multiplicity events in central pp collisions at LHC energy, $\\sqrt{s}$=14 TeV. It is assumed that the initial interactions produces a number of hot spots. Hydrodynamical evolution of two or more hot spots can generate sufficiently large elliptic flow to be accessible experimentally in 4-th order cumulant analysis.
Effects of the primary passage on the flow through the secondary passage of a shrouded-impeller pump
Wyman, Nicholas James
1994-01-01T23:59:59.000Z
is then solved utilizing a non-segregated finite element approach. Results of this analysis are compared to those of a lower-order analysis utilizing a simplified flow domain consisting of only the secondary flow passage. The model upgrade facilitates a thorough...
Finsler geometric perspective on the bulk flow in the universe
Zhe Chang; Ming-Hua Li; Sai Wang
2013-03-07T23:59:59.000Z
Astronomical observations showed that there may exist a bulk flow with peculiar velocities in the universe, which contradicts with the (\\Lambda)CDM model. The bulk flow reveals that the observational universe is anisotropic at large scales. In fact, a more reliable observation on the anisotropy of spacetime comes from the CMB power spectra. The WMAP and Planck satellites both show that there is a hemispherical power asymmetry at large-angular scales. In this paper, we propose a "wind" scenario to the bulk flow (or the anisotropy of spacetime). Under the influence of the "wind", the spacetime metric could become a Finsler structure. By resolving the null geodesic equation, we obtain the modified luminosity distance, which has a dipolar form at the leading order. Thus, the "wind" describes well the bulk flow. In addition, we perform a least-(\\chi^2) fit to the data of type Ia supernovae (SNe Ia) in the Union2.1 compilation. The peculiar velocity of the bulk flow has an upper limit (v_{bulk}\\lesssim 4000 \\rm{km/s}), which is compatible with all the existing observational values.
Intermittent dry granular flow in a vertical pipe
Yann Bertho; Frederique Giorgiutti-Dauphine; Jean-Pierre Hulin
2005-08-12T23:59:59.000Z
The intermittent compact flow of glass beads in a vertical glass pipe of small diameter is studied experimentally by combining particle fraction, pressure, and air and grain flow rates measurements with a spatio-temporal analysis of the flow. At the onset of the flow, a decompaction front is observed to propagate from the bottom to the top of the tube at a velocity much larger than that of the grains. The blockage front also propagates upwards and at a still higher velocity. The decompaction induces a decreasing pressure wave strongly amplified as it propagates upwards towards the top of the tube. Pressure variations of 3000 Pa or more are detected in this region while particle fraction variations are of the order of 0.02. Grain velocities during the flow period also increase strongly at the top of the tube while the corresponding fraction of total time decreases. A 1D numerical model based on a simple relation between the effective acceleration of the grains and the particle fraction variations reproduces the amplification effect and provides predictions for its dependence on the permeability of the packing.
Modeling for Free Surface Flow with Phase Change
Luo Xiaoyong; Ni Mingjiu; Ying, Alice; Abdou, M. [University of California, Los Angeles (United States)
2005-05-15T23:59:59.000Z
The development of predictive capability for free surface flow with phase change is essential to evaluate liquid wall protection schemes for various fusion chambers in IFE and MFE. This paper presents a numerical methodology for free surface flow with heat and mass transfer to help resolve feasibility issues encountered in the aforementioned fusion engineering fields. The numerical methodology is conducted within the framework of the incompressible flow with the heat and mass transfer model. We present a new second-order projection method, in conjunction with Approximate-Factorization techniques (AF method) for incompressible Navier-Stokes equations. The level set method was used to capture the free surface of the flow and the deformation of the droplets accurately. This numerical investigation identifies the physics characterizing transient heat and mass transfer of the droplet and the free surface flow. The preliminary results show that the numerical methodology is successful in modeling the free surface with heat and mass transfer, though some severe deformation such as breaking and merging occurs. The versatility of the numerical methodology shows that the work can easily handle complex physical conditions in fusion science and engineering.
Environmental embrittlement in ordered intermetallic alloys
Liu, C.T. [Oak Ridge National Lab., TN (United States); Stoloff, N.S. [Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Materials Engineering
1992-12-31T23:59:59.000Z
Ordered intermetallics based on aluminides and silicides possess many promising properties for elevated-temperature applications; however, poor fracture resistance and limited fabricability restrict their use as engineering material. Recent studies have shown that environmental embrittlement is a major cause of low ductility and brittle fracture in many ordered intermetallic alloys. There are two types of environmental embrittlement observed in intermetallic alloys. One is hydrogen-induced embrittlement occurring at ambient temperatures in air. The other is oxygen-induced embrittlement in oxidizing atmospheres at elevated temperatures. In most cases, the embrittlements are due to a dynamic effect involving generation and penetration of embrittling agents (i.e., hydrogen or oxygen ) during testing. Diffusion of embrittling agents plays a dominant role in fracture of these intermetallic alloys. This chapter summarizes recent progress in understanding and reducing environmental embrittlement in these alloys.
Growing quantum states with topological order
Letscher, Fabian; Fleischhauer, Michael
2015-01-01T23:59:59.000Z
We discuss a protocol for growing states with topological order in interacting many-body systems using a sequence of flux quanta and particle insertion. We first consider a simple toy model, the superlattice Bose Hubbard model, to explain all required ingredients. Our protocol is then applied to fractional quantum Hall systems in both, continuum and lattice. We investigate in particular how the fidelity, with which a topologically ordered state can be grown, scales with increasing particle number N. For small systems exact diagonalization methods are used. To treat large systems with many particles, we introduce an effective model based on the composite fermion description of the fractional quantum Hall effect. This model also allows to take into account the effects of dispersive bands and edges in the system, which will be discussed in detail.
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.
Revising partial pre-orders with partial pre-orders: A unit-based revision framework
Liu, Weiru
Revising partial pre-orders with partial pre-orders: A unit-based revision framework Jianbing Ma1, Queen's University Belfast, Belfast BT9 5BN, UK, email: {jma03, w.liu}@qub.ac.uk 2 CRIL-CNRS, UMR 8188@cril.fr Abstract Belief revision studies strategies about how agents revise their belief states when receiving new
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.
Gradual Ordering in Red Abalone Nacre
Gilbert, P. U. P. A.; Metzler, Rebecca A.; Zhou, Dong; Scholl, Andreas; Doran, Andrew; Young, Anthony; Kunz, Martin; Tamura, Nobumichi; Coppersmith, Susan N.
2008-09-03T23:59:59.000Z
Red abalone (Haliotis rufescens) nacre is a layered composite biomineral that contains crystalline aragonite tablets confined by organic layers. Nacre is intensely studied because its biologically controlled microarchitecture gives rise to remarkable strength and toughness, but the mechanisms leading to its formation are not well understood. Here we present synchrotron spectromicroscopy experiments revealing that stacks of aragonite tablet crystals in nacre are misoriented with respect to each other. Quantitative measurements of crystal orientation, tablet size, and tablet stacking direction show that orientational ordering occurs not abruptly but gradually over a distance of 50 {micro}m. Several lines of evidence indicate that different crystal orientations imply different tablet growth rates during nacre formation. A theoretical model based on kinetic and gradual selection of the fastest growth rates produces results in qualitative and quantitative agreement with the experimental data and therefore demonstrates that ordering in nacre is a result of crystal growth kinetics and competition either in addition or to the exclusion of templation by acidic proteins as previously assumed. As in other natural evolving kinetic systems, selection of the fastest-growing stacks of tablets occurs gradually in space and time. These results suggest that the self-ordering of the mineral phase, which may occur completely independently of biological or organic-molecule control, is fundamental in nacre formation.
Flow Duration Curve Load Duration Curve
Flow Duration Curve Load Duration Curve 1. Develop Flow Duration Curve 2. Estimate load given flow and concentration data--select appropriate conversion factors 3. Develop Load Duration Curve 4. Plot observed data with Load Duration Curve What are they? How do you make one? Describes the percent of time a flow rate
SHORT-TUBE SUBCRITICAL FLOW Enerag Division
Oak Ridge National Laboratory
#12;SHORT-TUBE SUBCRITICAL FLOW Y. C. Mei Enerag Division Oak Ridge National Laboratory Oak Ridge-tube subcritical flow. For short tubes used as refrigerant expansion devices, the orifice model is found inadequate-TUBE SUBCRITICAL FLOW INTRODUCTION Much theoretical and experimental work regarding short tube fluid flow has
Mach flow angularity probes for scramjet engine flow path diagnostics
Jalbert, P.A.; Hiers, R.S. Jr. [Sverdrup Technology, Inc., Arnold AFS, TN (United States)
1993-12-31T23:59:59.000Z
Mach-flow angularity (MFA) probes were developed for use in scramjet flow path probe rakes. Prototype probes were fabricated to demonstrate the assembly processes (numerical control machining, furnace brazing, and electron beam welding). Tests of prototype probes confirmed the thermal durability margins and life cycle. Selected probes were calibrated in air at Mach numbers from 1.75 to 6.0. Acceptance criteria for the production probes stressed thermal durability and pressure (and, consequently, Mach number) measurement quality. This new water-cooled MFA probe has 0.397-cm shaft diameter and is capable of withstanding heat fluxes of 2.724 kW/sq cm.
Why Insertion Turbine Meters are Replacing Orifice Plates for Steam Flow Measurement
Rusnak, J. J.
1983-01-01T23:59:59.000Z
WHY INSERTION TURBINE MBTBRS A E REPLACING ORIFICE PLATES FOR STEAM FLOW MEASURE ENT J. J. Rusnak Engineering Measurements Company Longmont, Colorado ABSTRACT Flow measurement is a complex and application related discipline. It borders... to be instrumented quickly, economically and without dis rupting production; and further, these meters had to be accurate in order to be useful in making energy saving decisions. Thus, the entry of the insertion turbine meter for steam in 1975. Since then it has...
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.
QCD as a topologically ordered system
Zhitnitsky, Ariel R., E-mail: arz@physics.ubc.ca
2013-09-15T23:59:59.000Z
We argue that QCD belongs to a topologically ordered phase similar to many well-known condensed matter systems with a gap such as topological insulators or superconductors. Our arguments are based on an analysis of the so-called “deformed QCD” which is a weakly coupled gauge theory, but nevertheless preserves all the crucial elements of strongly interacting QCD, including confinement, nontrivial ? dependence, degeneracy of the topological sectors, etc. Specifically, we construct the so-called topological “BF” action which reproduces the well known infrared features of the theory such as non-dispersive contribution to the topological susceptibility which cannot be associated with any propagating degrees of freedom. Furthermore, we interpret the well known resolution of the celebrated U(1){sub A} problem where the would be ?{sup ?} Goldstone boson generates its mass as a result of mixing of the Goldstone field with a topological auxiliary field characterizing the system. We then identify the non-propagating auxiliary topological field of the BF formulation in deformed QCD with the Veneziano ghost (which plays the crucial role in resolution of the U(1){sub A} problem). Finally, we elaborate on relation between “string-net” condensation in topologically ordered condensed matter systems and long range coherent configurations, the “skeletons”, studied in QCD lattice simulations. -- Highlights: •QCD may belong to a topologically ordered phase similar to condensed matter (CM) systems. •We identify the non-propagating topological field in deformed QCD with the Veneziano ghost. •Relation between “string-net” condensates in CM systems and the “skeletons” in QCD lattice simulations is studied.
Location of laccase in ordered mesoporous materials
Mayoral, Álvaro [Laboratorio de Microscopias Avanzadas, Instituto de Nanociencia de Aragon, Universidad de Zaragoza, Edificio I - D, Mariano Esquillor, 50018 Zaragoza (Spain); Gascón, Victoria; Blanco, Rosa M.; Márquez-Álvarez, Carlos; Díaz, Isabel, E-mail: idiaz@icp.csic.es [Instituto de Catálisis y Petroleoquímica, CSIC, c/Marie Curie 2, 28049 Madrid (Spain)
2014-11-01T23:59:59.000Z
The functionalization with amine groups was developed on the SBA-15, and its effect in the laccase immobilization was compared with that of a Periodic Mesoporous Aminosilica. A method to encapsulate the laccase in situ has now been developed. In this work, spherical aberration (C{sub s}) corrected scanning transmission electron microscopy combined with high angle annular dark field detector and electron energy loss spectroscopy were applied to identify the exact location of the enzyme in the matrix formed by the ordered mesoporous solids.
Seismic imaging using higher order statistics
Srinivasan, Karthik
1999-01-01T23:59:59.000Z
weather, Gaussian noise example: (a) measurement x(t), (b) measurement y(t), (c) cross-correlation, (d) coherence-correlation, (e) bispectral-correlation, (f) bicoherence-correlation . . 21 Non-Gaussian noise example: (a) measurement x(t), (b... in the later sections. 2. SECOND ORDER STATISTICS 2. 1. Cross-correlation Given two real random signals x(t), y(t), and their Fourier transforms X(tu), Y(tu), the cross-correlation is given by v (r) = E[x(t)y(t+r)] = F '[P (m)], where F' is the Fourier...
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),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of EnergyEnergyENERGY TAXBalanced ScorecardReactor Technology SubcommitteeWilliamsOn April 1, Order No.CMS
Linearized fluid/gravity correspondence: from shear viscosity to all order hydrodynamics
Yanyan Bu; Michael Lublinsky
2014-11-02T23:59:59.000Z
In ref.~\\cite{1406.7222}, we reported a construction of all order linearized fluid dynamics with strongly coupled $\\mathcal{N}=4$ super-Yang-Mills theory as underlying microscopic description. The linearized fluid/gravity correspondence makes it possible to resum all order derivative terms in the fluid stress tensor. Dissipative effects are fully encoded by the shear term and a new one, emerging starting from third order in hydrodynamic derivative expansion. In this work, we provide all computational details omitted in~\\cite{1406.7222} and present additional results. We derive closed-form linear holographic RG flow-type equations for momenta-dependent transport coefficient functions. Generalized Navier-Stokes equations are shown to emerge from the constraint components of the bulk Einstein equations. We perturbatively solve the RG equations for the viscosity functions, up to third order in derivative expansion, and up to this order compute spectrum of small fluctuations. Finally, we solve the RG equations numerically, thus accounting for all order derivative terms in the boundary stress tensor.
Mirrored serpentine flow channels for fuel cell
Rock, Jeffrey Allan (Rochester, NY)
2000-08-08T23:59:59.000Z
A PEM fuel cell having serpentine flow field channels wherein the input/inlet legs of each channel border the input/inlet legs of the next adjacent channels in the same flow field, and the output/exit legs of each channel border the output/exit legs of the next adjacent channels in the same flow field. The serpentine fuel flow channels may be longer, and may contain more medial legs, than the serpentine oxidant flow channels.
Pressure compensated flow control valve
Minteer, Daniel J. (West Richland, WA)
1999-01-01T23:59:59.000Z
The invention is an air flow control valve which is capable of maintaining a constant flow at the outlet despite changes in the inlet or outlet pressure. The device consists of a shell assembly with an inlet chamber and outlet chamber separated by a separation plate. The chambers are connected by an orifice. Also located within the inlet chamber is a port controller assembly. The port controller assembly consists of a differential pressure plate and port cap affixed thereon. The cap is able to slide in and out of the orifice separating the inlet and outlet chambers. When the pressure differential is sufficient, the differential pressure plate rises or falls to maintain a constant air flow. Movement of the port controller assembly does not require the use of seals, diaphragms, tight tolerances, bushings, bearings, hinges, guides, or lubricants.
Kaplan, C. Nadir
For a variety of quenched random spin systems on an Apollonian network, including ferromagnetic and antiferromagnetic bond percolation and the Ising spin glass, we find the persistence of ordered phases up to infinite ...
Time integration for diffuse interface models for two-phase flow
Aland, Sebastian, E-mail: sebastian.aland@tu-dresden.de
2014-04-01T23:59:59.000Z
We propose a variant of the ?-scheme for diffuse interface models for two-phase flow, together with three new linearization techniques for the surface tension. These involve either additional stabilizing force terms, or a fully implicit coupling of the Navier–Stokes and Cahn–Hilliard equation. In the common case that the equations for interface and flow are coupled explicitly, we find a time step restriction which is very different to other two-phase flow models and in particular is independent of the grid size. We also show that the proposed stabilization techniques can lift this time step restriction. Even more pronounced is the performance of the proposed fully implicit scheme which is stable for arbitrarily large time steps. We demonstrate in a Taylor-flow application that this superior coupling between flow and interface equation can decrease the computation time by several orders of magnitude.
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.
Dissolution of ordered precipitates under ion irradiation
Camus, E.; Bourdeau, F.; Abromeit, C.; Wanderka, N.; Wollenberger, H. [Hahn-Meitner-Institut Berlin GmbH (Germany)
1995-09-01T23:59:59.000Z
The stability of the ordered {gamma}{prime} precipitates under 300-keV Ni{sup +} irradiation was investigated between room temperature and 623 K. The two competing mechanisms of destabilization by cascade producing irradiation, i.e. disordering and dissolution of the {gamma}{prime} precipitates in Nimonic PE16 alloy, has been studied separately by electron microscopy and field-ion microscopy with atom probe. At high temperatures, the precipitates are stable. At intermediate temperatures, the precipitates dissolve by ballistic mixing into the matrix, but the interface is restored by the radiation-enhanced atomic jumps. The order in the precipitates remains stable. At low temperatures, the precipitates are dissolved by atomic mixing. The dissolution proceeds in a diffusional manner with a diffusion coefficient normalized by the displacement rate D/K = 0.75 nm{sup 2}dpa{sup {minus}1}. The precipitates become disordered by a fluence of 0.1 dpa, whereas precipitate dissolution needs much higher fluences.
Weiler, Markus
feedback, flow through the fractured bedrock, kinematic wave routing and flow through discrete preferentialConnectivity due to preferential flow controls water flow and solute transport at the hillslope the major controls on water flow and solute transport at the hillslope scale remains a major topic
Rheo-optical determination of flow birefringence and flow dichroism with the pulsed laser method
Rheo-optical determination of flow birefringence and flow dichroism with the pulsed laser method online 29 August 2006 Rheo-optical measurements of the flow birefringence, flow dichroism systems under flow. However, the standard setup of an optical train, using phase modulation for the rheo-optical
Interfacial flows in corrugated microchannels: flow regimes, transitions and hysteresis
Feng, James J.
, 1266-1276 (2011), doi:10.1016/j.ijmultiphaseflow.2011.08.003 #12;model, microfluidics, porous media 1 of displacing oil by water in enhanced oil recovery (Marle, 1981; Lenormand et al., 1988). More recently on hy- drodynamic principles and concrete flow mechanisms. In fact, conflicting assumptions have been
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.
Bolton, R.D.; Bounds, J.A.; Rawool-Sullivan, M.W.
1996-05-07T23:59:59.000Z
An alpha detector for application in areas of high velocity gas flows, such as smokestacks and air vents. A plurality of spaced apart signal collectors are placed inside an enclosure, which would include smokestacks and air vents, in sufficient numbers to substantially span said enclosure so that gas ions generated within the gas flow are electrostatically captured by the signal collector means. Electrometer means and a voltage source are connected to the signal collectors to generate an electrical field between adjacent signal collectors, and to indicate a current produced through collection of the gas ions by the signal collectors. 4 figs.
Bolton, Richard D. (Los Alamos, NM); Bounds, John A. (Los Alamos, NM); Rawool-Sullivan, Mohini W. (Los Alamos, NM)
1996-01-01T23:59:59.000Z
An alpha detector for application in areas of high velocity gas flows, such as smokestacks and air vents. A plurality of spaced apart signal collectors are placed inside an enclosure, which would include smokestacks and air vents, in sufficient numbers to substantially span said enclosure so that gas ions generated within the gas flow are electrostatically captured by the signal collector means. Electrometer means and a voltage source are connected to the signal collectors to generate an electrical field between adjacent signal collectors, and to indicate a current produced through collection of the gas ions by the signal collectors.
Osinski, Charles Anthony
1963-01-01T23:59:59.000Z
zero and unity. The Ostwald- de Waele Equation (4), commonly known as the power law, is sometimes used to describe fluid behavior of this type. The rheological equation is (4) where the parameters "k" and "n" are constant for a particular fluid... be extended to include Reynolds numbers and the type of flow determined to be laminar and/or turbulent. It is assumed that the transition from laminar to turbulent flow occurs at a Reynolds number of 2100, the numeric distribution of Reynolds numbers...
Li, Yi
Dynamo action in flows with cat's eyes A l i c e C o u r v o i s i e r A n d r e w G i l b e r t Y of k for R = 500 and the flow (2.4) and (2.5). nts k = 2.5 and k = 5 are highlighted. Magnetic field). In (a) k = 2.5 and we have 0.5 max Bz (with max Bz 0.6 max |B|), and in (b) k = 5 and the levels .65 max
Modified Knudsen ansatz and elliptic flow in $\\sqrt{s}$=14 TeV pp collisions
Chaudhuri, A K
2011-01-01T23:59:59.000Z
Assuming that hot spots are formed in initial pp collisions, in a modified Knudsen ansatz, which accounts for the entropy generation in viscous fluid evolution, we have given predictions for elliptic flow in $\\sqrt{s}$=14 TeV pp collisions. Predicted flow depends on the number of hot spots and hot spot sizes. If two to four hot spots of size $\\approx$0.1 fm are formed in initial pp collisions, in events with multiplicity $n_ {mult}\\approx$10-15, modified Knudsen ansatz predicted flow is accessible experimentally in 4th order cumulant method.
Modified Knudsen ansatz and elliptic flow in $\\sqrt{s}$=14 TeV pp collisions
A. K. Chaudhuri
2011-05-16T23:59:59.000Z
Assuming that hot spots are formed in initial pp collisions, in a modified Knudsen ansatz, which accounts for the entropy generation in viscous fluid evolution, we have given predictions for elliptic flow in $\\sqrt{s}$=14 TeV pp collisions. Predicted flow depends on the number of hot spots and hot spot sizes. If two to four hot spots of size $\\approx$0.1 fm are formed in initial pp collisions, in events with multiplicity $n_ {mult}\\approx$10-15, modified Knudsen ansatz predicted flow is accessible experimentally in 4th order cumulant method.
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.
Ordered dust structures in a glow discharge
Karasev, V. Yu., E-mail: plasmadust@yandex.ru; Ivanov, A. Yu.; Dzlieva, E. S.; Eikhval'd, A. I. [St. Petersburg State University, Institute of Physics (Russian Federation)
2008-02-15T23:59:59.000Z
Highly ordered three-dimensional dust structures are created in a striated glow discharge, and their horizontal cross-sectional images are analyzed. Calculated correlation functions, local correlation parameters, and corresponding approximations are used to classify the state of a structure according to the Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) two-dimensional melting theory and a phenomenological approach. An orientational map based on an orientational parameter is proposed to expose domains in a cross section of a structure. It is shown that a plasma crystal is a polycrystal consisting of hexagonal domains (crystallites). Thermophoretic forces are used to create corners of various angles in the perimeter of the structure. Transition between hexagonal and square cell shapes is observed.
Modulated order in classical magnetoelastic chains
Marchand, M.; Caille, A.
1988-09-01T23:59:59.000Z
We investigate the nature of modulated lattice distortions that can occur in a two-dimensional array of classical magnetoelastic chains coupled together by elastic interactions only. The phase diagram for the lattice structure is obtained by numerically minimizing a one-dimensional, temperature-dependent, effective-free-energy functional of the elastic variables. At zero temperature, only phases where the winding number is uniquely defined are found, and the transitions among these phases are suggestive of a complete devil's-staircase behavior. These numerical results are consistent with N. Ishimura's analytic demonstration that such a staircase exists (J. Phys. Soc. Jpn. 54, 4752 (1985)). At finite temperatures, phases where the winding number is not uniquely defined are found and, in addition, first- and second-order transitions appear. Also of interest are superdegenerate lines where the equilibrium phase is composed of noninteracting solitons of zero energy.
Theoretical description of laser melt pool dynamics, Task order number B239634, Quarter 3 report
Dykhne, A.
1995-05-10T23:59:59.000Z
Melting of solid matter under laser radiation is realized in almost every process of laser technology. The present paper addresses melted material flows in cases when melt zones are shallow, i.e., the zone width is appreciably greater than or of the same order as its depth. Such conditions are usually realized when hardening, doping or perforating thin plates or when using none-deep penetration. Melted material flowing under conditions of deep penetration, drilling of deep openings and cutting depends on a number of additional factors (as compared to the shallow-pool case), namely, formation of a vapor and gas cavern in the sample and propagation of the laser beam through the cavern. These extra circumstances complicate hydrodynamic consideration of the liquid bath and will be addressed is the paper to follow.
American Power: Order (2010-CE-0911) | Department of Energy
Broader source: Energy.gov (indexed) [DOE]
Power: Order (2010-CE-0911) American Power: Order (2010-CE-0911) October 5, 2010 DOE issued an Order and entered into a Compromise Agreement with American Power Solutions, Inc....
Holography as a highly efficient RG flow : Part 1
Behr, Nicolas; Mukhopadhyay, Ayan
2015-01-01T23:59:59.000Z
We investigate how the holographic correspondence can be reconstructed as a special RG flow in a strongly interacting large $N$ field theory. We firstly define a "highly efficient RG flow" as one in which the cut-off in momentum space can be adjusted as a functional of the elementary fields, and of the external sources and of the background metric in order to be compatible with the following requirement: the Ward identities for single-trace operators involving conservation of energy, momentum and global charges must preserve the same form at every scale. In order to absorb the contributions of the multi-trace operators to these effective Ward identities, the external sources and the background metric need to be redefined at each scale, and thus they become dynamical as in the dual gravity equations. We give a schematic construction of such highly efficient RG flows using appropriate collective variables, leaving a more explicit construction in certain limits to the second part of this work. We find that all h...
Data Flow Testing Neelam Gupta
Gupta, Rajiv
Data Flow Testing Neelam Gupta The University of Arizona, Tucson, Arizona and Rajiv Gupta The University of Arizona, Tucson, Arizona Software testing techniques are designed to execute a program on a set of test cases that provide suÃ?cient coverage under some speci#12;c well-de#12;ned test coverage criterion
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.
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.
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.
Superconducting flux flow digital circuits
Hietala, Vincent M. (Placitas, NM); Martens, Jon S. (Sunnyvale, CA); Zipperian, Thomas E. (Albuquerque, NM)
1995-01-01T23:59:59.000Z
A NOR/inverter logic gate circuit and a flip flop circuit implemented with superconducting flux flow transistors (SFFTs). 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.
Flow preconditioner for electrostatic precipitator
Honacker, H.; Drlik, R.J.
1980-01-01T23:59:59.000Z
A flow preconditioner for an electrostatic precipitator removes particulate matter from a stream of polluted gas immediately after it passes through a tangential inlet at the lower end of a vertical cylindrical housing and straightens and divides the stream into laminations parallel to the axis of the housing. It comprises an annular ledge or choke ring extending inwardly from said housing above the inlet and an assembly of vanes above said ledge extending radially from the axis of the housing and angularly spaced apart. Each of said vanes has a flow receiving edge directed toward said inlet, a curved portion extending upwardly and away from said inlet, and a flat portion extending upwardly from said curved portion in a plane parallel to the housing axis. The curved portion of each vane defines a trough having a camber which gradually decreases along its span from the outer end of the vane towards the axis of the housng, together with means to vary the centrifugal flow distribution relative to the housing to render the preconditioner adjustable for various flow capacities.
A Simple Heat-Flow Quality Function And Appraisal Of Heat-Flow...
Simple Heat-Flow Quality Function And Appraisal Of Heat-Flow Measurements And Heat-Flow Estimates From The Uk Geothermal Catalogue Jump to: navigation, search OpenEI Reference...
Flow Analysis on a Limited Volume Chilled Water System
Zheng, Lin [Los Alamos National Laboratory
2012-07-31T23:59:59.000Z
LANL Currently has a limited volume chilled water system for use in a glove box, but the system needs to be updated. Before we start building our new system, a flow analysis is needed to ensure that there are no high flow rates, extreme pressures, or any other hazards involved in the system. In this project the piping system is extremely important to us because it directly affects the overall design of the entire system. The primary components necessary for the chilled water piping system are shown in the design. They include the pipes themselves (perhaps of more than one diameter), the various fitting used to connect the individual pipes to form the desired system, the flow rate control devices (valves), and the pumps that add energy to the fluid. Even the most simple pipe systems are actually quite complex when they are viewed in terms of rigorous analytical considerations. I used an 'exact' analysis and dimensional analysis considerations combined with experimental results for this project. When 'real-world' effects are important (such as viscous effects in pipe flows), it is often difficult or impossible to use only theoretical methods to obtain the desired results. A judicious combination of experimental data with theoretical considerations and dimensional analysis are needed in order to reduce risks to an acceptable level.
INITIAL -COMPACTNESS IN LINEARLY ORDERED SPACES PAOLO LIPPARINI
Lipparini, Paolo
equipped with a linear order and with a base of order-convex sets. See, e. g., Bennet and Lutzer [BL
Energy Department Awards First Major Task Order Under Streamlined...
First Major Task Order Under Streamlined Contracting System Energy Department Awards First Major Task Order Under Streamlined Contracting System October 17, 2005 - 11:59am Addthis...
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...
President Issues Executive Order Aimed at Preparing for the Impacts...
Broader source: Energy.gov (indexed) [DOE]
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...
OVERVIEW OF EXECUTIVE ORDER 13XXX Federal Leadership in Environmental...
Office of Environmental Management (EM)
OVERVIEW OF EXECUTIVE ORDER 13XXX Federal Leadership in Environmental, Energy and Economic Performance OVERVIEW OF EXECUTIVE ORDER 13XXX Federal Leadership in Environmental, Energy...
FY 2006 Executive Order 13101 Report: Department of Energy Affirmative...
Broader source: Energy.gov (indexed) [DOE]
6 Executive Order 13101 Report: Department of Energy Affirmative Procurement and Recycling Fiscal Year 2006 Report, 31207 FY 2006 Executive Order 13101 Report: Department of...
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.
Second order multidimensional sign-preserving remapping for ALE methods
Hill, Ryan N [Los Alamos National Laboratory; Szmelter, J. [LOUGHBOROUGH UNIV.
2010-12-15T23:59:59.000Z
A second-order conservative sign-preserving remapping scheme for Arbitrary Lagrangian-Eulerian (ALE) methods is developed utilising concepts of the Multidimensional Positive Definite Advection Transport Algorithm (MPDATA). The algorithm is inherently multidimensional, and so does not introduce splitting errors. The remapping is implemented in a two-dimensional, finite element ALE solver employing staggered quadrilateral meshes. The MPDATA remapping uses a finite volume discretization developed for volume coordinates. It is applied for the remapping of density and internal energy arranged as cell centered, and velocity as nodal, dependent variables. In the paper, the advection of scalar fields is examined first for test cases with prescribed mesh movement. A direct comparison of MPDATA with the performance of the van Leer MUSCL scheme indicates advantages of a multidimensional approach. Furthermore, distinctly different performance between basic MPDATA and the infinite gauge option is illustrated using benchmarks involving transport of a sign changing velocity field. Further development extends the application of MPDATA remapping to the full ALE solver with a staggered mesh arrangement for density, internal energy and momentum using volume coordinates. At present, two options of the algorithm - basic and infinite gauge - are implemented. To ensure a meaningful assessment, an identical Lagrangian solver and computational mesh update routines are used with either MPDATA or van Leer MUSCL remapping. The evaluation places particular focus on the abilities of both schemes to accurately model multidimensional problems. Theoretical considerations are supported with numerical examples. In addition to the prescribed mesh movement cases for advection of scalars, the demonstrations include two-dimensional Eulerian and ALE flow simulations on quadrilateral meshes with both fixed and variable timestep control. The key comparisons include the standard test cases of Sod and Noh for single material problems. The results demonstrate that the MPDATA gauge option is suitable for providing accurate ALE remapping and preserves the multidimensionality and sign of both scalar and vector fields.
A Semidefinite Optimization Approach to the Parallel Row Ordering ...
2015-03-17T23:59:59.000Z
problem in which one wishes to minimize the total material flow cost. .... ing system [33], balancing hydraulic turbine runners [39], numerical analysis [14], optimal ...
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.
High-order ENO schemes for unstructured meshes based on least-squares reconstruction
Ollivier-Gooch, C.F.
1997-03-01T23:59:59.000Z
High-order accurate schemes for conservation laws for unstructured meshes are not nearly so well advanced as such schemes for structured meshes. Consequently, little or nothing is known about the possible practical advantages of high-order discretization on unstructured meshes. This article is part of an ongoing effort to develop high-order schemes for unstructured meshes to the point where meaningful information can be obtained about the trade-offs involved in using spatial discretizations of higher than second-order accuracy on unstructured meshes. This article describes a high-order accurate ENO reconstruction scheme, called DD-L{sub 2}-ENO, for use with vertex-centered upwind flow solution algorithms on unstructured meshes. The solution of conservation equations in this context can be broken naturally into three phases: (1) solution reconstruction, in which a polynomial approximation of the solution is obtained in each control volume. (2) Flux integration around each control volume, using an appropriate flux function and a quadrature rule with accuracy commensurate with that of the reconstruction. (3) Time evolution, which may be implicit, explicit, multigrid, or some hybrid.
Anirban Pathak
2007-02-24T23:59:59.000Z
Interaction of intense laser beam with an inversion symmetric third order nonlinear medium is modeled as a quartic anharmonic oscillator. A first order operator solution of the model Hamiltonian is used to study the possibilities of generation of higher order nonclassical states. It is found that the higher order squeezed and higher order antibunched states can be produced by this interaction. It is also shown that the higher order nonclassical states may appear separately, i.e. a higher order antibunched state is not essentially higher order squeezed state and vice versa.
Water and Mercury Pipe Flow Simulation in FLUENTSimulation in FLUENT
McDonald, Kirk
Water and Mercury Pipe Flow Simulation in FLUENTSimulation in FLUENT Yan Zhan, Foluso Ladeinde Stony Brook University thSep.21th , 2010 #12;OutlineOutline Â· Straight Pipe flowStraight Pipe flow Â· Curved pipe flow #12;OutlineOutline Â· Straight Pipe flowStraight Pipe flow Â· Curved pipe flow #12
Higher Order Squeezing and Higher Order Subpoissonian Photon Statistics in Intermediate States
Amit Verma; Anirban Pathak
2010-04-10T23:59:59.000Z
Recently simpler criteria for the Hong-Mandel higher order squeezing (HOS) and higher order subpossonian photon statistics (HOSPS) are provided by us [Phys. Lett. A 374 (2010) 1009]. Here we have used these simplified criteria to study the possibilities of observing HOSPS and HOS in different intermediate states, such as generalized binomial state, hypergeometric state, negative binomial state and photon added coherent state. It is shown that these states may satisfy the condition of HOS and HOSPS. It is also shown that the depth and region of nonclassicality can be controlled by controlling various parameters related to intermediate states. Further, we have analyzed the mutual relationship between different signatures of higher order nonclassicality with reference to these intermediate states. We have observed that the generalized binomial state may show signature of HOSPS in absence of HOS. Earlier we have shown that NLVSS shows HOS in absence of HOSPS. Consequently it is established that the HOSPS and HOS of same order are independent phenomenon.
Analysis of oscillating flow cooled SMA actuator
Pachalla Seshadri, Rajagopal
2005-11-01T23:59:59.000Z
literature, most of the cooling mechanisms involve unidirectional forced convection. This may not be the most effective method. Oscillating flow in a channel can sometimes enhance heat transfer over a unidirectional flow. One possible explanation...
A quasionedimensional approach for hypersonic stagnationpoint flows
A quasiÂonedimensional approach for hypersonic stagnationÂpoint flows Arno Klomfass 1 LehrÂ und An approximate method for the efficient calculation of stagnation streamline quantities in hypersonic flows about
GUI for Hypersonic flow solver Master Project
Diggavi, Suhas
GUI for Hypersonic flow solver Master Project Student : Enrique Guzman concerns the design of a GUI for commanding hypersonic flow applications using CFD techniques, as well as its potential applications. These problems are quite complex, since the called hypersonic regime
Smokeless Control of Flare Steam Flow Rate
Agar, J.; Balls, B. W.
1979-01-01T23:59:59.000Z
measurement of mass flow rate of flare gas, in spite of the hostile environment. Its use for initiating control of flare steam flow rate and the addition of molecular weight compensation, using specific gravity (relative density) measurement to achieve...
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 ...
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...
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.
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 ...
Purchase Requisition & Purchase Order Approval Process Office of Research Administration
Purchase Requisition & Purchase Order Approval Process Office of Research Administration Purchase are sent to the Office of Research Administration as part of the approval for setting up a Purchase Order Requisition & Purchase Order Approval Process 1. Overview Purchase Requisitions and Field Purchase orders
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.
Sormani, Mattia C; Magorrian, John
2015-01-01T23:59:59.000Z
We use a Cartesian grid to simulate the flow of gas in a barred Galactic potential and investigate the effects of varying the sound speed in the gas and the resolution of the grid. For all sound speeds and resolutions, streamlines closely follow closed orbits at large and small radii. At intermediate radii shocks arise and the streamlines shift between two families of closed orbits. The point at which the shocks appear and the streamlines shift between orbit families depends strongly on sound speed and resolution. For sufficiently large values of these two parameters, the transfer happens at the cusped orbit as hypothesised by Binney et al. over two decades ago. For sufficiently high resolutions the flow downstream of the shocks becomes unsteady. If this unsteadiness is physical, as appears to be the case, it provides a promising explanation for the asymmetry in the observed distribution of CO.
Zonal Flow as Pattern Formation
Parker, Jeffrey B
2015-01-01T23:59:59.000Z
In this section, we examine the transition from statistically homogeneous turbulence to inhomogeneous turbulence with zonal flows. Statistical equations of motion can be derived from the quasilinear approximation to the Hasegawa-Mima equation. We review recent work that finds a bifurcation of these equations and shows that the emergence of zonal flows mathematically follows a standard type of pattern formation. We also show that the dispersion relation of modulational instability can be extracted from the statistical equations of motion in a certain limit. The statistical formulation can thus be thought to offer a more general perspective on growth of coherent structures, namely through instability of a full turbulent spectrum. Finally, we offer a physical perspective on the growth of large-scale structures.
Flow Imaging Using MRI: Quantification and Analysis
Jiraraksopakun, Yuttapong
2010-07-14T23:59:59.000Z
&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, Jim Ji Committee Members, Andrew K. Chan Deepa Kundur Yoonsuck Choe Mary P. McDougall Head of Department, Costas N... Committee: Dr. Jim Ji 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...
A theory for radial jet reattachment flow
Hadden, Lynne Loise
2012-06-07T23:59:59.000Z
, the velocity profile and mass entrainment are given accordrng to Goertler's t. wo- dimensional free jet theory. His analysrs of a free jet also assumes that. the turbulent eddy viscosity is constant ar ross the jet. (6) For the case of laminar flow... of total jet momentum. Laminar jet flow is approximated using Schlichting's velocity profile, whereas turbulent flow calculations are made assuming Goertler's velocity profile. Momentum integral principles are applied to the flow at reattachment...
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.
Building up the elliptic flow: analytical insights
Yoshitaka Hatta; Bo-Wen Xiao
2014-07-15T23:59:59.000Z
In this paper, we present a fully analytical description of the early-stage formation of elliptic flow in relativistic viscous hydrodynamics. We first construct an elliptic deformation of Gubser flow which is a boost invariant solution of the Navier-Stokes equation with a nontrivial transverse profile. We then analytically calculate the momentum anisotropy of the flow as a function of time and discuss the connection with the empirical formula by Bhalerao {\\it et al.} regarding the viscosity dependence of elliptic flow.
The Cotton tensor and the Ricci flow
Mantegazza, Carlo
2012-01-01T23:59:59.000Z
We compute the evolution equation of the Cotton tensor under the Ricci flow of a three dimensional Riemannian manifold.
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.
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.
Microgravity Flow Regime Transition Modeling
Shephard, Adam M.
2010-07-14T23:59:59.000Z
apparatus have been used in past flow regime mapping experiments such as Venturi, perforated pipe, annular, and t-junction mixers. The mixing apparatus used in a particular experiment determines the bubble size distribution at the inlet... pressure of 80 kPa was reported, however, the temperature was not. The orientation and location of the test section with respect to the aircraft are unknown. The mixing apparatus used in the experiment was a Venturi mixer. This data set does...
Incompressible flow over delta wings
Nathman, James Kirwin
1976-01-01T23:59:59.000Z
&M University. vi TABLE OF CONTENTS ~Pa e INTRODUCTION REVIEW OF LITERATURE THEORY 12 NUMERICAL APPLICATIONS AND RESULTS Attached Flow Model Calculation of Pressure Distribution Fixed-Wake Model Free-Wake Model CONCLUSIONS 21 21 24 26 32 52...- lation. This theory has been expanded to include spanwise velocity effects and the leading-edge separation associated with delta wings. The numerical technique has made use of both fixed and free wakes. In the fixed-wake model the analytical results...
Cyclotron resonance in plasma flow
Artemyev, A. V.; Agapitov, O. V.; Krasnoselskikh, V. V. [LPC2E/CNRS-University of Orleans, Orleans (France)] [LPC2E/CNRS-University of Orleans, Orleans (France)
2013-12-15T23:59:59.000Z
This paper is devoted to the mechanism of particle acceleration via resonant interaction with the electromagnetic circular wave propagating along the inhomogeneous background magnetic field in the presence of a plasma flow. We consider the system where the plasma flow velocity is large enough to change the direction of wave propagation in the rest frame. This system mimics a magnetic field configuration typical for inner structure of a quasi-parallel shock wave. We consider conditions of gyroresonant interaction when the force corresponding to an inhomogeneity of the background magnetic field is compensated by the Lorentz force of the wave-magnetic field. The wave-amplitude is assumed to be about 10% of the background magnetic field. We show that particles can gain energy if kv{sub sw}>?>kv{sub sw}??{sub c} where k is the wave number, v{sub sw} is a plasma flow velocity, and ? and ?{sub c} are the wave frequency and the particle gyrofrequency, respectively. This mechanism of acceleration resembles the gyrosurfing mechanism, but the effect of the electrostatic field is replaced by the effect of the magnetic field inhomogeneity.
Structural stability of cooling flows
Henrik Omma; James Binney
2003-12-31T23:59:59.000Z
Three-dimensional hydrodynamical simulations are used to investigate the structural stability of cooling flows that are episodically heated by jets from a central AGN. The radial profile of energy deposition is controlled by (a) the power of the jets, and (b) the pre-outburst density profile. A delay in the ignition of the jets causes more powerful jets to impact on a more centrally concentrated medium. The net effect is a sufficient increase in the central concentration of energy deposition to cause the post-outburst density profile to be less centrally concentrated than that of an identical cluster in which the outburst happened earlier and was weaker. These results suggest that the density profiles of cooling flows oscillate around an attracting profile, thus explaining why cooling flows are observed to have similar density profiles. The possibility is raised that powerful FR II systems are ones in which this feedback mechanism has broken down and a runaway growth of the source parameters has occurred.
[Investigation of transitions from order to chaos in dynamical systems
Not Available
1992-01-01T23:59:59.000Z
This report briefly discusses the following topics on chaotic systems; numerical investigations of fast dynamo problem for stationary space-periodic flows with chaotic streamlines; analytical and numerical investigations of magnetic field generation by conducting flows with finite resistivity; and emittance growth in charged particle beams.
DESIGN AND IMPLEMENTATION OF AN ORDERED MEMORY ACCESS ARCHITECTURE1
Data Flow (SDF) refers to a sub- class of data flow graphs where the actors lack data depen- dency in their firing patterns [5]. Thus in SDF graphs the number of tokens produced and consumed in each of the output of DSP algorithms fall into the SDF paradigm. In our group at Berkeley, we have imple- mented Gabriel
Flow Duration Curve Load Duration Curve
#12;Flow Duration Curve Load Duration Curve #12;1. Develop Flow Duration Curve 2. Estimate load given flow and concentration data--select appropriate conversion factors 3. Develop Load Duration Curve 4. Plot observed data with Load Duration Curve #12;What are they? How do you make one? #12;Describes
A quasionedimensional approach for hypersonic stagnationpoint flows
A quasiÂonedimensional approach for hypersonic stagnationÂpoint flows Arno Klomfass 1 LehrÂ und An approximate method for the efficient calculation of stagnation streamline quantities in hypersonic flows aboutÂconduction coefficient [W=mK] 2 Introduction The hypersonic flow about a spacecraft entering the atmosphere at orbital
Optimal Power Flow Incorporating Voltage Collapse Constraints
CaÃ±izares, Claudio A.
Optimal Power Flow Incorporating Voltage Collapse Constraints William Rosehart Claudio Ca on the current operating con- ditions is presented. Second, an Optimal Power Flow formulation that incorporates: Voltage Collapse, Optimal Power Flow, Bifur- cations. I. Introduction As open-access market principles
(Preview Draft) Chapter 3. Stocks and Flows
Ford, Andrew
the state over time. It will take some time for the flows to have their effect on the stocks, so the stocks(Preview Draft) Chapter 3. Stocks and Flows: The Building Blocks of System Dynamics Models The best way to construct a model is to start with the stocks, add the flows and then use converters to explain
Progress in Grid Scale Flow Batteries
Progress in Grid Scale Flow Batteries IMRE GYUK, PROGRAM MANAGER ENERGY STORAGE RESEARCH, DOE Flow;LogMW Renewables (not capacity factor adjusted) 9 8 7 6 5 4 3 Wind Wind (proj) Solar PV Solar PV 2011Year #12;Flow Battery Research at PNNL and Sandia #12
Managing talent flow. 2006 Energy and Resources
Managing talent flow. 2006 Energy and Resources Talent Pulse Survey Report Consulting #12;Executive ................................................................ 13 Contents #12;1 Managing talent flow 2006 Energy and Resources Talent Pulse Survey Report 2006 strategy. 1 #12;2 Managing talent flow 2006 Energy and Resources Talent Pulse Survey Report Key findings
SEISMIC MONITORING OF CARBON DIOXIDE FLUID FLOW
Santos, Juan
SEISMIC MONITORING OF CARBON DIOXIDE FLUID FLOW J. E. Santos1, G. B. Savioli2, J. M. Carcione3, DÂ´e, Argentina SEISMIC MONITORING OF CARBON DIOXIDE FLUID FLOW Â p. #12;Introduction. I Storage of CO2). SEISMIC MONITORING OF CARBON DIOXIDE FLUID FLOW Â p. #12;Introduction. II CO2 is separated from natural
Setup of Particle Image Velocimetry (PIV) in Hypersonic Flows.
Anwar, Moazzam
2008-01-01T23:59:59.000Z
??The accuracy of numerical methods in calculating the flow of backward facing steps in turbulent hypersonic flows is limited due to a lack of flow… (more)
WHICH HYDRAULIC MODEL TO USE IN VERTICAL FLOW CONSTRUCTED WETLANDS?
Paris-Sud XI, UniversitÃ© de
WHICH HYDRAULIC MODEL TO USE IN VERTICAL FLOW CONSTRUCTED WETLANDS? Ania Morvannoua , Nicolas-equilibrium model, preferential flow path, vertical flow constructed wetlands INTRODUCTION Constructed wetlands (CWs
Groth, Clinton P. T.
in propulsion systems (e.g., gas turbine engines and solid propellant rocket motors). Nonetheless, computational
Chen, LW; Ko, Che Ming; Lin, ZW.
2004-01-01T23:59:59.000Z
. Zhang, M. Gyulassy, and C. M. Ko, Phys. Lett. B 455, 45 (1999). [8] Y. Zheng, C. M. Ko, B. A. Li, and B. Zhang, Phys. Rev. Lett. 83, 2534 (1999). [9] S. A. Voloshin, Nucl. Phys. A715, 379c (2003). [10] P. F. Kolb, J. Sollfrank, and U. Heinz, Phys.... Adler et al., STAR Collaboration, Phys. Rev. Lett. 87, 082301 (2001). [32] Z. W. Lin and C. M. Ko, J. Phys. G 30, S263 (2004). [33] A. M. Poskanzer and S. A. Voloshin, Phys. Rev. C 58, 1671 (1998). [34] D. Molnar and M. Gyulassy, Nucl. Phys. A697...
Fontenot, Raymond Lee
2012-02-14T23:59:59.000Z
, and turbomachinery seals. The results of this investigation show that all of the important features are extracted without loss in accuracy. v To My Family vi ACKNOWLEDGMENTS I would rst like to thank my advisor, Dr. Cizmas, for his patience and advice through...
Sibille, Etienne
New Ethanol Ordering Process Effective March 11, 2013, Ethanol must be ordered through an Ethanol Services will accept faxed orders for Ethanol. Â· Monday, March 11, 2013 is the first day the PantherExpress System will accept orders for Ethanol. Requirements Â· Your PantherExpress System account must be properly
A Genetic Algorithm based Approach for Multi-Objective Data-Flow Graph Optimization
Coello, Carlos A. Coello
that the correct- ness of algebraic transformations realized by the underlying genetic operators selection shown for power optimization. In order to avoid inferior results caused by the counteracting demandsA Genetic Algorithm based Approach for Multi-Objective Data-Flow Graph Optimization Birger Landwehr
Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed Generator Units with
Chaudhary, Sanjay
of virtual impedance parameters and (ii) higher accuracy in reactive power flow calculation. The improved With larger portion of growing electricity demand which is being fed through distributed generation (DG, in order to decouple real and reactive power, to increase the stability margin and also to improve
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
Investigation of Flow Characteristics in an Airlift-Driven Raceway Reactor for Algae Cultivation
Investigation of Flow Characteristics in an Airlift-Driven Raceway Reactor for Algae Cultivation are the most common choice for outdoor algae cultivation due to their low cost relative to enclosed. Algae require adequate mixing in order to maximize exposure to essential nutrients for growth
A Hamilton-Jacobi approach to junction problems and application to traffic flows
Paris-Sud XI, UniversitÃ© de
A Hamilton-Jacobi approach to junction problems and application to traffic flows C. Imbert , R of a model case of first order Hamilton-Jacobi equations posed on a "junction", that is to say the union of such problems. Keywords: Hamilton-Jacobi equations, discontinuous Hamiltonians, viscosity solutions, optimal
of the project. Construction documents include final detailed drawings, specifications, material lists and all the project will be constructed, schedules work with his subcontractors, and orders materials. BuildingSignificant Project Flow Chart (for Board Approved Capital Construction Projects 2 million
Measurements of ship-induced flow and its effect on bank erosion
Yu, Hongbin
2012-06-07T23:59:59.000Z
for prediction of drawdown and return velocity. The ship induced waves model is verified with field measurements. The method of energy computation for ship induced flow is developed in order to determine its relative contribution to bank erosion. In this study...
Modeling complex biological flows in multi-scale systems using the APDEC framework
Modeling complex biological flows in multi-scale systems using the APDEC framework David Trebotich methods are based on higher-order finite difference methods in complex geometry with adaptivity-mail: trebotich1@llnl.gov Abstract. We have developed advanced numerical algorithms to model biological fluids
European Research Community On Flow Turbulence And Combustion ERCOFTAC Bulletin 30 45
Gui, Lichuan
systems. Reported examples of applications include the measurements of droplets in a spray jet [1], bubbles in water flow [2], cavitation bubbles [3], solid particles in a mixing tank [4]. Such experiments require a sufficiently high degree of transparency of the multiphase system in order to allow illumination
Blade tip clearance effect on the performance and flow field of a three stage axial turbine
Abdel-Fattah, Sharef Aly
2012-06-07T23:59:59.000Z
rate was also measured using a venturi flow meter in order to discern the effect the blade tip clearance has on the engine efficiency and performance. Results have shown that the blade tip clearance losses appear to play a smaller role when compared...
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
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.
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.
Doppler-shifted fluorescence imaging of velocity fields in supersonic reacting flows
Allen, M.G.; Davis, S.J.; Kessler, W.J.; Sonnenfroh, D.M. (Physical Sciences, Inc., Andover, MA (United States))
1992-07-01T23:59:59.000Z
The application of Doppler-shifted fluorescence imaging of velocity fields in supersonic reacting flows is analyzed. Focussing on fluorescence of the OH molecule in typical H2-air Scramjet flows, the effects of uncharacterized variations in temperature, pressure, and collisional partner composition across the measurement plane are examined. Detailed measurements of the (1,0) band OH lineshape variations in H2-air combustions are used, along with single-pulse and time-averaged measurements of an excimer-pumped dye laser, to predict the performance of a model velocimeter with typical Scramjet flow properties. The analysis demonstrates the need for modification and control of the laser bandshape in order to permit accurate velocity measurements in the presence of multivariant flow properties. 13 refs.
Transport in a slowly perturbed convective cell flow. A. P. Itin 1 , R. de la Llave 2 , A. I in such flows may be very sensitive to initial conditions, making possible chaotic advection [6] of passiveÂscales (of order # # -3 ln#). In case of a generic perturbation, a drop of passive impurity (e.g. dye) put
Kudrolli, Arshad
through fractured rock in aquifers and oil reservoirs to small-scale flows in natural and artificially,8] scales that involve both unconsolidated and consolidated media [9Â13]. Dissolution and liquefaction can over many orders of magnitude in length scale with applications that range from large-scale flow
Evolution of flow disturbances in cocurrent gas-liquid flows
McCready, M.J.
1992-10-01T23:59:59.000Z
Studies of interfacial waves in horizontal gas-liquid flows, close to neutral stability, suggest that the rate of evolution of the interface may be linked to nonlinear interactions between the fundamental mode and the subharmonic -- even if the subharmonic is linearly stable. The rate of evolution increases as the subharmonic becomes more unstable. A comparison of linear stability techniques used to predict the initial behavior of waves reveals similar predictions of growth rates and almost identical speeds between a two layer laminar Orr-Sommerfeld theory and an Orr-Sommerfeld theory when the effect of the (turbulent) gas flow enters as boundary conditions on the liquid layer. However, there is disagreement at small wavenumbers as to the point at which the growth curve crosses 0. This is a significant problem because longwave disturbances, in our case roll waves, form by growth of (initially) small amplitude waves that have frequencies which are 0.5 to 1 Hz, which is in the range where the two theories disagree about the sign of the growth rate. While nonlinear effects are probably involved in the formation of the peak (at least while its amplitude is small), the linear growth rate must play an important role when the amplitude is small.
Guide to good practices for timely orders to operators
NONE
1998-12-01T23:59:59.000Z
This Guide to Good Practices is written to enhance understanding of, and provide direction for, Timely Orders to Operators, Chapter XV of Department of Energy (DOE) Order 5480.19, Conduct of Operations Requirements for DOE Facilities. The practices in this guide should be considered when planning or reviewing Timely Orders to Operators programs. Contractors are advised to adopt procedures that meet the intent of DOE Order 5480.19. Timely Orders to Operators is an element of an effective Conduct of Operations program. The complexity and array of activities performed in DOE facilities dictate the necessity for timely orders to operators to promote safe and efficient operations.
Effects of time ordering in quantum nonlinear optics
Nicolás Quesada; J. E. Sipe
2014-07-25T23:59:59.000Z
We study time ordering corrections to the description of spontaneous parametric down-conversion (SPDC), four wave mixing (SFWM) and frequency conversion (FC) using the Magnus expansion. Analytic approximations to the evolution operator that are unitary are obtained. They are Gaussian preserving, and allow us to understand order-by-order the effects of time ordering. We show that the corrections due to time ordering vanish exactly if the phase matching function is sufficiently broad. The calculation of the effects of time ordering on the joint spectral amplitude of the photons generated in spontaneous SPDC and SFWM are reduced to quadrature.
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.
A new precision flow calorimeter
Johnson, Mark Gezer
1984-01-01T23:59:59.000Z
differences. With no sample fluid flowing, a supply of electrical power is fed to the inner calorimeter. The reference fluid is evaporated with this electrical power and the thermo-syphon system is brought to controlled steady-state conditions of pressure... calorimeter is kept cooler than the inner calorimeter for reasons discussed in chapter 4. Thus the above mentioned procedure is essential to avoid condensation in Freon@-11 vapor lines. The thermo-syphon ensures a saturated Freon&-11 vapor phase in the top...
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
Flow shop scheduling with peak power consumption constraints
K. Fang
2012-03-29T23:59:59.000Z
Mar 29, 2012 ... Flow shop scheduling with peak power consumption constraints ... Keywords: scheduling, flow shop, energy, peak power consumption, integer ...
Controlling the Delay of Small Flows in Datacenters
Carra, Damiano
and CAPEX and ignore designs which could help reduce delay of delay sensitive flows. The flow routing
Second-Order Accurate Method for Solving Radiation-Hydrodynamics
Edwards, Jarrod Douglas
2013-11-12T23:59:59.000Z
Second-order discretization for radiation-hydrodynamics is currently an area of great interest. Second-order methods used to solve the respective single-physics problems often differ fundamentally, making it difficult to combine them in a second...
Under(lining) Leh : the order of consciousness
Bagai, Radhika
1994-01-01T23:59:59.000Z
"Because it is beautiful, there must be a formal order." - Leonardo Da Vinci. The thesis is an investigation into the idea that nothing built evolves naturally, that there is an explicit or implicit structure and an order ...
Direct Evidence of Lithium-Induced Atomic Ordering in Amorphous...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Evidence of Lithium-Induced Atomic Ordering in Amorphous TiO2 Nanotubes . Direct Evidence of Lithium-Induced Atomic Ordering in Amorphous TiO2 Nanotubes . Abstract: In this paper,...
Secretary Bodman Signs Order to Help Restore Electricity to East...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Signs Order to Help Restore Electricity to East Texas More Quickly Secretary Bodman Signs Order to Help Restore Electricity to East Texas More Quickly September 28, 2005 - 10:58am...
Nanoscale Phase Separation, Cation Ordering, and Surface Oxygen...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Separation, Cation Ordering, and Surface Oxygen Chemistry in Pristine Li1.2Ni0.2Mn0.6O2 for Li-Ion Batteries. Nanoscale Phase Separation, Cation Ordering, and Surface Oxygen...
COMPUTATIONAL FLUID DYNAMICS INCOMPRESSIBLE FLOW
McDonough, James M.
to numerically solve the Euler equations in order to predict effects of bomb blast waves following WW IIÂ71, and was published the following year [1]. Computing power at that time was still grossly inadequate for what we.S., in Europe (especially France, Great Britain and Sweden) and in the (former) Soviet Union. Today
Process for retarding fluid flow
Sandford, B.B.; Zillmer, R.C.
1989-01-10T23:59:59.000Z
A process is described for retarding the flow of fluid in a subterranean formation, comprising: (a) introducing an effective amount of a gel-forming composition into a subterranean formation, the gel-forming composition being operable when gelled in the formation for retarding the flow of fluid therein. The gel-forming composition consists of: i. a first substance dissolved in water to form an aqueous solution, the first substance being selected from the group consisting of polyvivyl alcohols, and mixtures thereof, wherein the gel-forming composition contains an amount of the first substance of from about 0.5 to about 5 weight percent of the gel-forming composition, and ii. an effective amount of glutaraldehyde which is operable for forming a weakly acidic condition having a pH from about 5.5 to less than 7 in the gel-forming composition and also operable for promoting crosslinking of the first substance and glutaraldehyde and for forming a gel from the gel-forming composition under the weakly acidic condition within a period of time no greater than about 5 days without adding an acidic catalyst to the gel-forming composition to lower the pH of the gel-forming composition below about 5.5.
Proximal bodies in hypersonic flow
Deiterding, Ralf [ORNL; Laurence, Stuart J [California Institute of Technology, Pasadena; Hornung, Hans G [California Institute of Technology, Pasadena
2007-01-01T23:59:59.000Z
Hypersonic flows involving two or more bodies travelling in close proximity to one another are encountered in several important situations, both natural and man-made. The present work seeks to investigate one aspect of the resulting flow problem by exploring the forces experienced by a secondary body when it is within the domain of influence of a primary body travelling at hypersonic speeds. An analytical methodology based on the blast wave analogy is developed and used to predict the secondary force coefficients for simple geometries in both two and three dimensions. When the secondary body is entirely inside the primary shocked region, the nature of the lateral force coefficient is found to depend strongly on the relative size of the two bodies. For two spheres, the methodology predicts that the secondary body will experience an exclusively attractive lateral force if the secondary diameter is larger than one-sixth the primary diameter. The analytical results are compared with those from numerical simulations and reasonable agreement is observed if an appropriate normalization for the lateral displacement is used. Results from a series of experiments in the T5 hypervelocity shock tunnel are also presented and compared with perfect-gas numerical simulations, with good agreement. A new force-measurement technique for short-duration hypersonic facilities, enabling the experimental simulation of the proximal bodies problem, is described. This technique provides two independent means of measurement, and the agreement observed between the two gives a further degree of confidence in the results obtained.
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.
Comment on "Dynamics of Weak First Order Phase Transitions"
G. Harris; G. Jungman
1995-11-08T23:59:59.000Z
We comment on an earlier paper of M. Gleiser, regarding mechanisms of first-order phase transitions.
Energy and Eigenstate Using First Order Perturbation Theory
Raghu Ramachandran; Rama Komaragiri
2009-10-30T23:59:59.000Z
The first order estimate of energy and eigenstate of a perturbed system are found by summation over its basis.
Higher order antibunching is not a rare phenomenon
Prakash Gupta; Pratap Narayan Pandey; Anirban Pathak
2005-08-08T23:59:59.000Z
Since the introduction of higher order nonclassical effects, higher order squeezing has been reported in a number of different physical systems but higher order antibunching is predicted only in three particular cases. In the present work, we have shown that the higher order antibunching is not a rare phenomenon rather it can be seen in many simple optical processes. To establish our claim, we have shown it in six wave mixing process, four wave mixing process and in second harmonic generation process.
Particle filter based on thermophoretic deposition from natural convection flow
Sasse, A.G.B.M.; Nazaroff, W.W. (Univ. of California, Berkeley, CA (United States)); Gadgil, A.J. (Lawrence Berkeley Lab., CA (United States))
1994-04-01T23:59:59.000Z
We present an analysis of particle migration in a natural convection flow between parallel plates and within the annulus of concentric tubes. The flow channel is vertically oriented with one surface maintained at a higher temperature than the other. Particle migration is dominated by advection in the vertical direction and thermophoresis in the horizontal direction. From scale analysis it is demonstrated that particles are completely removed from air flowing through the channel if its length exceeds L[sub c] = (b[sup 4]g/24K[nu][sup 2]), where b is the width of the channel, g is the acceleration of gravity, K is a thermophoretic coefficient of order 0.5, and [nu] is the kinematic viscosity of air. Precise predictions of particle removal efficiency as a function of system parameters are obtained by numerical solution of the governing equations. Based on the model results, it appears feasible to develop a practical filter for removing smoke particles from a smoldering cigarette in an ashtray by using natural convection in combination with thermophoresis. 22 refs., 8 figs., 1 tab.
Progress in Creating Stabilized Gas Layers in Flowing Liquid Mercury
Wendel, Mark W [ORNL; Felde, David K [ORNL; Riemer, Bernie [ORNL; Abdou, Ashraf A [ORNL; D'Urso, Brian R [ORNL; West, David L [ORNL
2009-01-01T23:59:59.000Z
The Spallation Neutron Source (SNS) facility in Oak Ridge, Tennessee uses a liquid mercury target that is bombarded with protons to produce a pulsed neutron beam for materials research and development. In order to mitigate expected cavitation damage erosion (CDE) of the containment vessel, a two-phase flow arrangement of the target has been proposed and was earlier proven to be effective in significantly reducing CDE in non-prototypical target bodies. This arrangement involves covering the beam "window", through which the high-energy proton beam passes, with a protective layer of gas. The difficulty lies in establishing a stable gas/liquid interface that is oriented vertically with the window and holds up to the strong buoyancy force and the turbulent mercury flow field. Three approaches to establishing the gas wall have been investigated in isothermal mercury/gas testing on a prototypical geometry and flow: (1) free gas layer approach, (2) porous wall approach, and (3) surface-modified approach. The latter two of these approaches show success in that a stabilized gas layer is produced. Both of these successful approaches capitalize on the high surface energy of liquid mercury by increasing the surface area of the solid wall, thus increasing gas hold up at the wall. In this paper, a summary of these experiments and findings is presented as well as a description of the path forward toward incorporating the stabilized gas layer approach into a feasible gas/mercury SNS target design.
M.A. Plummer
2013-09-01T23:59:59.000Z
Wells in traditional hydrothermal reservoirs are used to extract heat and to dispose of cooled water. In the first case, high productivity (the ratio of production flow rate to the pressure differential required to produce that rate) to is preferred in order to maximize power generation, while minimizing the parasitic energy loss of pumping. In the second case, high injectivity (the ratio of injection flow rate to the pressure differential required to produce that rate) is preferred, in order to reduce pumping costs. In order to improve productivity or injectivity, cold water is sometimes injected into the reservoir in an attempt to cool and contract the surrounding rock matrix and thereby induce dilation and/or extension of existing fractures or to generate new fractures. Though the increases in permeability associated with these changes are likely localized, by improving connectivity to more extensive high-permeability fractures they can at least temporarily provide substantially improved productivity or injectivity.
An elastic-perfectly plastic flow model for finite element analysis of perforated materials
Jones, D.P.; Gordon, J.L.; Hutula, D.N.; Banas, D.; Newman, J.B.
1999-02-01T23:59:59.000Z
This paper describes the formulation of an elastic-perfectly plastic flow theory applicable to equivalent solid [EQS] modeling of perforated materials. An equilateral triangular array of circular penetrations is considered. The usual assumptions regarding geometry and loading conditions applicable to the development of elastic constants for EQS modeling of perforated plates are considered to apply here. An elastic-perfectly plastic [EPP] EQS model is developed for a collapse surface that includes fourth-order stress terms. The fourth order yield function has been shown to be appropriate for plates with a triangular array of circular holes. A complete flow model is formulated using the consistent tangent modulus approach based on the fourth order yield function.
QUEST FOR THE CONTROL ON THE SECOND ORDER ...
2010-10-08T23:59:59.000Z
Oct 8, 2010 ... on the second order derivatives of the field solution, in addition to zero and first order ones ... However, most of the physical phenomena are spatial second order in nature. This means ...... SIAM Review, 41(2):199–235, 1999.
Higher-order corrections to electron-scattering multipoles
J. Grineviciute; Dean Halderson
2014-04-10T23:59:59.000Z
A procedure is suggested for calculating electro-excitation multipoles to order $1/M^{2}_{N}$ with only the operators required in the calculations to order $1/M_{N}$. It is also shown that calculations to order $1/M^{2}_{N}$ cannot account for the contributions of a fully relativistic calculation of the transverse response.
ON HIGHER ORDER BOURGAIN ALGEBRAS OF A NEST ALGEBRA
Feeman, Timothy
ON HIGHER ORDER BOURGAIN ALGEBRAS OF A NEST ALGEBRA TIMOTHY G. FEEMAN Abstract. Following earlier algebras, as well as the second order Bourgain algebras, associated with a nest algebra, we herein demonstrate that a given nest algebra has (essentially) at most six different third order Bourgain algebras
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.
Flow characteristics in underground coal gasification
Chang, H.L.; Himmelblau, D.M.; Edgar, T.F.
1982-01-01T23:59:59.000Z
During the Hoe Creek No. 2 (Wyoming) underground-coal-gasification field test, researchers introduced helium pulses to characterize the flow field and to estimate the coefficients in dispersion models of the flow. Flow models such as the axial-dispersion and parallel tanks-in-series models allowed interpretation of the in situ combustion flow field from the residence time distribution of the tracer gas. A quantitative analysis of the Hoe Creek tracer response curves revealed an increasing departure from a plug-flow regime with time, which was due to the combined effects of the free and forced convection in addition to the complex nonuniformity of the flow field. The Peclet number was a function of temperature, pressure, gas recovery, and characteristic velocity, as well as the split of the gas between the parallel streams in the model.
Dissipation flow-frames: particle, energy, thermometer
Ván, P
2013-01-01T23:59:59.000Z
We associate the following physical co-mover conditions of to different frame choices: i) Eckart: particle flow, ii) Landau-Lifshitz: energy flow, iii) J\\"uttner: moving thermometer frame. The role of fixing a flow-frame is analysed with respect to local equilibrium concentrating on dissipative currents and forces in single component relativistic fluids. The special role of a "J\\"uttner frame" is explored and contrasted to the more common Eckart and Landau-Lifshitz choices.
Dissipation flow-frames: particle, energy, thermometer
P. Ván; T. S. Biró
2013-05-14T23:59:59.000Z
We associate the following physical co-mover conditions of to different frame choices: i) Eckart: particle flow, ii) Landau-Lifshitz: energy flow, iii) J\\"uttner: moving thermometer frame. The role of fixing a flow-frame is analysed with respect to local equilibrium concentrating on dissipative currents and forces in single component relativistic fluids. The special role of a "J\\"uttner frame" is explored and contrasted to the more common Eckart and Landau-Lifshitz choices.
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.
A New Aerosol Flow System for Photochemical and Thermal Studies of Tropospheric Aerosols
Ezell, Michael J.; Johnson, Stanley N.; Yu, Yong; Perraud, Veronique; Bruns, Emily; Alexander, M. L.; Zelenyuk, Alla; Dabdub, Donald; Finlayson-Pitts, Barbara J.
2010-05-01T23:59:59.000Z
For studying the formation and photochemical/thermal reactions of aerosols relevant to the troposphere, a unique, high-volume, slow-flow, stainless steel aerosol flow system equipped with 5 UV lamps has been constructed and characterized experimentally. The total flow system length 6 is 8.5 m and includes a 1.2 m section used for mixing, a 6.1 m reaction section and a 1.2 m 7 transition cone at the end. The 45.7 cm diameter results in a smaller surface to volume ratio than is found in many other flow systems and thus reduces the potential contribution from wall reactions. The latter are also reduced by frequent cleaning of the flow tube walls which is made feasible by the ease of disassembly. The flow tube is equipped with ultraviolet lamps for photolysis. This flow system allows continuous sampling under stable conditions, thus increasing the amount of sample available for analysis and permitting a wide variety of analytical techniques to be applied simultaneously. The residence time is of the order of an hour, and sampling ports located along the length of the flow tube allow for time-resolved measurements of aerosol and gas-phase products. The system was characterized using both an inert gas (CO2) and particles (atomized NaNO3). Instruments interfaced directly to this flow system include a NOx analyzer, an ozone analyzer, relative humidity and temperature probes, a scanning mobility particle sizer spectrometer, an aerodynamic particle sizer spectrometer, a gas chromatograph-mass spectrometer, an integrating nephelometer, and a Fourier transform infrared spectrophotometer equipped with a long path (64 m) cell. Particles collected with impactors and filters at the various sampling ports can be analyzed subsequently by a variety of techniques. Formation of secondary organic aerosol from ?-pinene reactions (NOx photooxidation and ozonolysis) are used to demonstrate the capabilities of this new system.
Inertial particle trapping in an open vortical flow
Jean-Regis Angilella; Rafael D. Vilela; Adilson E. Motter
2014-03-28T23:59:59.000Z
Recent numerical results on advection dynamics have shown that particles denser than the fluid can remain trapped indefinitely in a bounded region of an open fluid flow. Here, we investigate this counterintuitive phenomenon both numerically and analytically to establish the conditions under which the underlying particle-trapping attractors can form. We focus on a two-dimensional open flow composed of a pair of vortices and its specular image, which is a system we represent as a vortex pair plus a wall along the symmetry line. Considering particles that are much denser than the fluid, we show that two point attractors form in the neighborhood of the vortex pair provided that the particle Stokes number is smaller than a critical value of order unity. In the absence of the wall, the boundaries of the basins of the attracting points are smooth. When the wall is present, the point attractors describe counter-rotating ellipses in this frame, with a period equal to half the period of one isolated vortex pair. However, their boundaries are shown to become fractal if the distance to the wall is smaller than a critical distance that scales with the inverse square root of the Stokes number. This transformation is related to the breakdown of a separatrix that gives rise to a heteroclinic tangle close to the vortices, which we describe using a Melnikov function. For an even smaller distance to the wall, we demonstrate that a second separatrix breaks down and a new heteroclinic tangle forms farther away from the vortices. Particles released in the open part of the flow can approach the attractors and be trapped permanently provided that they cross the two separatrices. Furthermore, the trapping of heavy particles from the open flow is shown to be robust to the presence of gravity, viscosity, and noise.
Organized Oscillations of Initially-Turbulent Flow Past a Cavity
J.C. Lin; D. Rockwell
2002-09-17T23:59:59.000Z
Flow past an open cavity is known to give rise to self-sustained oscillations in a wide variety of configurations, including slotted-wall, wind and water tunnels, slotted flumes, bellows-type pipe geometries, high-head gates and gate slots, aircraft components and internal piping systems. These cavity-type oscillations are the origin of coherent and broadband sources of noise and, if the structure is sufficiently flexible, flow-induced vibration as well. Moreover, depending upon the state of the cavity oscillation, substantial alterations of the mean drag may be induced. In the following, the state of knowledge of flow past cavities, based primarily on laminar inflow conditions, is described within a framework based on the flow physics. Then, the major unresolved issues for this class of flows will be delineated. Self-excited cavity oscillations have generic features, which are assessed in detail in the reviews of Rockwell and Naudascher, Rockwell, Howe and Rockwell. These features, which are illustrated in the schematic of Figure 1, are: (i) interaction of a vorticity concentration(s) with the downstream corner, (ii) upstream influence from this corner interaction to the sensitive region of the shear layer formed from the upstream corner of the cavity; (iii) conversion of the upstream influence arriving at this location to a fluctuation in the separating shear layer; and (iv) amplification of this fluctuation in the shear layer as it develops in the streamwise direction. In view of the fact that inflow shear-layer in the present investigation is fully turbulent, item (iv) is of particular interest. It is generally recognized, at least for laminar conditions at separation from the leading-corner of the cavity, that the disturbance growth in the shear layer can be described using concepts of linearized, inviscid stability theory, as shown by Rockwell, Sarohia, and Knisely and Rockwell. As demonstrated by Knisely and Rockwell, on the basis of experiments interpreted with the aid of linearized theory, not only the fundamental component of the shear layer instability may be present, but a number of additional, primarily lower frequency components can exist as well. In fact, the magnitude of these components can be of the same order as the fundamental component. These issues have not been addressed for the case of a fully-turbulent in-flow and its separation from the leading corner of the cavity.
SOLVENT DISPERSION AND FLOW METER CALCULATION RESULTS
Nash, C.; Fondeur, F.; Peters, T.
2013-06-21T23:59:59.000Z
Savannah River National Laboratory (SRNL) found that the dispersion numbers for the six combinations of CSSX:Next Generation Solvent (NGS) “blend” and pure NGS versus salt solution, caustic wash, and strip aqueous solutions are all good. The dispersion numbers are indications of processability with centrifugal contactors. A comparison of solvent physical and thermal properties shows that the Intek™ solvent flow meter in the plant has a reading biased high versus calibrated flow when NGS is used, versus the standard CSSX solvent. The flow meter, calibrated for CSSX solvent, is predicted to read 2.8 gpm of NGS in a case where the true flow of NGS is 2.16 gpm.
Applications in MPC and Network Flows
2013-05-08T23:59:59.000Z
This allows for improvement in communication-efficiency. We apply our algorithm to model predictive control (MPC) and to network flow problems and show, ...
Radionuclide Sensors for Environmental Monitoring: From Flow...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
to Equilibration-Based Radionuclide Sensors for Environmental Monitoring: From Flow Injection Solid-Phase Absorptiometry to Equilibration-Based Abstract: The development...
Flow visualisation in inclined louvered fins
T'Joen, C.; De Paepe, M. [Department of Flow, Heat and Combustion Mechanics, Ghent University-UGent, Sint-Pietersnieuwstraat 41, 9000 Gent (Belgium); Jacobi, A. [Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801 (United States)
2009-04-15T23:59:59.000Z
In this study the flow within an interrupted fin design, the inclined louvered fin, is investigated experimentally through visualisation. The inclined louvered fin is a hybrid of the offset strip fin and standard louvered fin, aimed at improved performance at low Reynolds numbers for compact heat exchangers. The flow behaviour is studied in six geometrically different configurations over a range of Reynolds numbers and quantified using the concept of 'fin angle alignment factor'. The transition from steady laminar to unsteady flow was studied in detail. The fin geometry had a very large impact on the transitional flow behaviour, especially on vortex shedding. (author)
Microsphere estimates of blood flow: Methodological considerations
von Ritter, C.; Hinder, R.A.; Womack, W.; Bauerfeind, P.; Fimmel, C.J.; Kvietys, P.R.; Granger, D.N.; Blum, A.L. (Univ. of the Witwatersrand, Johannesburg (South Africa) Louisianna State Univ. Medical Center, Shreveport (USA) Universitaire Vaudois (Switzerland))
1988-02-01T23:59:59.000Z
The microsphere technique is a standard method for measuring blood flow in experimental animals. Sporadic reports have appeared outlining the limitations of this method. In this study the authors have systematically assessed the effect of blood withdrawals for reference sampling, microsphere numbers, and anesthesia on blood flow estimates using radioactive microspheres in dogs. Experiments were performed on 18 conscious and 12 anesthetized dogs. Four blood flow estimates were performed over 120 min using 1 {times} 10{sup 6} microspheres each time. The effects of excessive numbers of microspheres pentobarbital sodium anesthesia, and replacement of volume loss for reference samples with dextran 70 were assessed. In both conscious and anesthetized dogs a progressive decrease in gastric mucosal blood flow and cardiac output was observed over 120 min. This was also observed in the pancreas in conscious dogs. The major factor responsible for these changes was the volume loss due to the reference sample withdrawals. Replacement of the withdrawn blood with dextran 70 led to stable blood flows to all organs. The injection of excessive numbers of microspheres did not modify hemodynamics to a greater extent than did the injection of 4 million microspheres. Anesthesia exerted no influence on blood flow other than raising coronary flow. The authors conclude that although blood flow to the gastric mucosa and the pancreas is sensitive to the minor hemodynamic changes associated with the microsphere technique, replacement of volume loss for reference samples ensures stable blood flow to all organs over a 120-min period.
SEISMIC MONITORING OF CARBON DIOXIDE FLUID FLOW
santos
SEISMIC MONITORING OF. CARBON DIOXIDE FLUID FLOW. J. E. Santos. 1. , G. B. Savioli. 2. , J. M. Carcione. 3. , D. Gei. 3. 1. CONICET, IGPUBA, Fac.
Measurement of thermodynamics using gradient flow
Masakiyo Kitazawa; Masayuki Asakawa; Tetsuo Hatsuda; Takumi Iritani; Etsuko Itou; Hiroshi Suzuki
2014-12-15T23:59:59.000Z
We analyze bulk thermodynamics and correlation functions of the energy-momentum tensor in pure Yang-Mills gauge theory using the energy-momentum tensor defined by the gradient flow and small flow time expansion. Our results on thermodynamic observables are consistent with those obtained by the conventional integral method. The analysis of the correlation function of total energy supports the energy conservation. It is also addressed that these analyses with gradient flow require less statistics compared with the previous methods. All these results suggest that the energy-momentum tensor can be successfully defined and observed on the lattice with moderate numerical costs with the gradient flow.
Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling...
Broader source: Energy.gov (indexed) [DOE]
Spray, Combustion, & Emission Modeling using KH-ACT Primary Breakup Model & Detailed Chemistry Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling using KH-ACT Primary...
Fluid Gravity Engineering Rocket motor flow analysis
Anand, Mahesh
Fluid Gravity Engineering Capability Â· Rocket motor flow analysis -Internal (performance) -External young scientists/engineers Fluid Gravity Engineering Ltd #12;
Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling...
Broader source: Energy.gov (indexed) [DOE]
Technologies Program Office Program Manager: Mr. Gurpreet Singh Petrodiesel vs. Biodiesel 2 Primary Breakup Inner Nozzle Flow Influence of Physical and Chemical properties of...
Flow characteristics in underground coal gasification
Chang, H.L.; Himmelblau, D.M.; Edgar, T.F.
1982-01-01T23:59:59.000Z
During the underground coal gasification field test at the Hoe Creek site No. 2, Wyoming, helium pulses were introduced to develop information to characterize the flow field, and to estimate the coefficients in dispersion models of the flow. Quantitative analysis of the tracer response curves shows an increasing departure from a plug flow regime with time because of the combined effects of the free and forced convection in addition to the complex non-uniformity of the flow field. The Peclet number was a function of temperature, pressure, gas recovery and characteristic velocity, as well as the split of the gas between the parallel streams in the model. 17 refs.
Theoretical uncertainty of orifice flow measurement
Husain, Z.D. [Daniel Flow Products, Inc., Houston, TX (United States)
1995-12-01T23:59:59.000Z
Orifice meters are the most common meters used for fluid flow measurement, especially for measuring hydrocarbons. Meters are rugged, mechanically simple, and well suited for field use under extreme weather conditions. Because of their long history of use and dominance in the fluid flow measurement, their designs, installation requirements, and equations for flow rate calculation have been standardized by different organizations in the United States and internationally. These standards provide the guideline for the users to achieve accurate flow measurement. and minimize measurement uncertainty. This paper discusses different factors that contribute to the measurement inaccuracy and provide an awareness to minimize or eliminate these errors. Many factors which influence the overall measurement uncertainty are associated with the orifice meter application. Major contributors to measurement uncertainty include the predictability of flow profile, fluid properties at flowing condition, precision of empirical equation for discharge coefficient, manufacturing tolerances in meter components, and the uncertainty associated with secondary devices monitoring the static line pressure, differential pressure across the orifice plate, flowing temperature, etc. Major factors contributing to the measurement uncertainty for a thin, concentric, square-edged orifice flowmeter are as follows: (a) Tolerances in prediction of coefficient of discharge, (b) Predictability in defining the physical properties of the flowing fluid, (c) Fluid flow condition, (d) Construction tolerances in meter components, (e) Uncertainty of secondary devices/instrumentation, and (f) Data reduction and computation. Different factors under each of the above areas are discussed with precautionary measures and installation procedures to minimize or eliminate measurement uncertainty.
Hypercritical Advection Dominated Accretion Flow
G. E. Brown; C. -H. Lee; H. A. Bethe
2000-04-24T23:59:59.000Z
In this note we study the accretion disc that arises in hypercritical accretion of $\\dot M\\sim 10^8 M_{\\rm Edd}$ onto a neutron star while it is in common envelope evolution with a massive companion. In order to raise the temperature high enough that the disc might cool by neutrino emission, Chevalier found a small value of the $\\alpha$-parameter, where the kinematic coefficient of shear viscosity is $\
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.
The transition from the annular to the slug flow regime in two-phase flow
Haberstroh, Robert D.
1964-01-01T23:59:59.000Z
Experiments were conducted to determine the transition from annular to semiannular flow regimes for two-phase, gas-liquid upflow in vertical tubes. The influencesof liquid flow rate, tube diameter, liquid viscosity, surface ...
Tritium flow through a non-symmetrical source. Simulation of gas flow through an injection hole
Sharipov, Felix
Tritium flow through a non-symmetrical source. Simulation of gas flow through an injection hole of source in injection rarefaction parameter Âµ0 viscosity of tritium at T0 Pa s 2 #12;Ll = 5074.5 Lr = 5007
Laser Sheet Light Flow Visualization For Evaluating Room Air Flows From
LBNL-56483 Laser Sheet Light Flow Visualization For Evaluating Room Air Flows From Registers Iain S using a Planar Laser-Induced Fluorescence (PLIF) measurement technique. Water marked with fluorescent
Dispersion equation for water waves with vorticity and Stokes waves on flows with counter-currents
Vladimir Kozlov; Nikolay Kuznetsov
2014-06-05T23:59:59.000Z
The two-dimensional free-boundary problem of steady periodic waves with vorticity is considered for water of finite depth. We investigate how flows with small-amplitude Stokes waves on the free surface bifurcate from a horizontal parallel shear flow in which counter-currents may be present. Two bifurcation mechanisms are described: for waves with fixed Bernoulli's constant and fixed wavelength. In both cases the corresponding dispersion equations serve for defining wavelengths from which Stokes waves bifurcate. Sufficient conditions guaranteeing the existence of roots of these equations are obtained. Two particular vorticity distributions are considered in order to illustrate general results.
Comparison of the gradient flow with cooling in $SU(3)$ pure gauge theory
Claudio Bonati; Massimo D'Elia
2014-05-13T23:59:59.000Z
The gradient (Wilson) flow has been introduced recently in order to provide a solid theoretical framework for the smoothing of ultraviolet noise in lattice gauge configurations. It is interesting to ask how it compares with other, more heuristic and numerically cheaper smoothing techniques, such as standard cooling. In this study we perform such a comparison, focusing on observables related to topology. We show that, already for moderately small lattice spacings, standard cooling and the gradient flow lead to equivalent results, both for average quantities and configuration by configuration.
Site-Scale Saturated Zone Flow Model
G. Zyvoloski
2003-12-17T23:59:59.000Z
The purpose of this model report is to document the components of the site-scale saturated-zone flow model at Yucca Mountain, Nevada, in accordance with administrative procedure (AP)-SIII.lOQ, ''Models''. This report provides validation and confidence in the flow model that was developed for site recommendation (SR) and will be used to provide flow fields in support of the Total Systems Performance Assessment (TSPA) for the License Application. The output from this report provides the flow model used in the ''Site-Scale Saturated Zone Transport'', MDL-NBS-HS-000010 Rev 01 (BSC 2003 [162419]). The Site-Scale Saturated Zone Transport model then provides output to the SZ Transport Abstraction Model (BSC 2003 [164870]). In particular, the output from the SZ site-scale flow model is used to simulate the groundwater flow pathways and radionuclide transport to the accessible environment for use in the TSPA calculations. Since the development and calibration of the saturated-zone flow model, more data have been gathered for use in model validation and confidence building, including new water-level data from Nye County wells, single- and multiple-well hydraulic testing data, and new hydrochemistry data. In addition, a new hydrogeologic framework model (HFM), which incorporates Nye County wells lithology, also provides geologic data for corroboration and confidence in the flow model. The intended use of this work is to provide a flow model that generates flow fields to simulate radionuclide transport in saturated porous rock and alluvium under natural or forced gradient flow conditions. The flow model simulations are completed using the three-dimensional (3-D), finite-element, flow, heat, and transport computer code, FEHM Version (V) 2.20 (software tracking number (STN): 10086-2.20-00; LANL 2003 [161725]). Concurrently, process-level transport model and methodology for calculating radionuclide transport in the saturated zone at Yucca Mountain using FEHM V 2.20 are being carried out in the model report, ''Site-Scale Saturated Zone Transport'', MDL-NBS-HS-000010 Rev 01 (BSC 2003 [162419]). The velocity fields are calculated by the flow model, described herein, independent of the transport processes, and are then used as inputs to the transport model. Justification for this abstraction is presented in the model report, ''Saturated Zone Flow and Transport Model Abstraction'', MDL-NBS-HS-000021 (BSC 2003 [164870]).
The effects between two slotted plate flow meter under single, two, three components flow condition
Park, Sang Hyan
2005-02-17T23:59:59.000Z
THE INTERACTION BETWEEN A TWO SLOTTED PLATE FLOW METER UNDER ONE, TWO, OR THREE COMPONENT FLOW CONDITIONS A Thesis by SANG HYUN PARK Submitted to the Office of Graduate Studies of Texas A&M University in partial... fulfillment of the requirements for the degree of MASTER OF SCIENCE December 2004 Major Subject: Mechanical Engineering THE INTERACTION BETWEEN A TWO SLOTTED PLATE FLOW METER UNDER ONE, TWO, OR THREE COMPONENT FLOW...
Evaluation of a slotted orifice plate flow meter using horizontal two phase flow
Flores, Anita Elena
2000-01-01T23:59:59.000Z
EVALUATION OF A SLOTTED ORIFICE PLATE FLOW METER USING HORIZONTAL TWO PHASE FLOW A Thesis by ANITA ELENA FLORES Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE December 2000 Major Subject: Mechanical Engineering EVALUATION OF A SLOTTED ORIFICE PLATE FLOW METER USING HORIZONTAL TWO PHASE FLOW A Thesis by ANITA ELENA FLORES Submitted to Texas A&M University in partial fulfillment...
Fluctuating initial conditions and fluctuations in elliptic and triangular flow
A. K. Chaudhuri
2012-02-24T23:59:59.000Z
In heavy ion collisions, event-by-event fluctuations in participating nucleon positions can lead to triangular flow. With fluctuating initial conditions, flow coefficients will also fluctuate. In a hydrodynamic model, we study the fluctuations in elliptic and triangular flow, due to fluctuating initial conditions. Both elliptic and triangular flow fluctuates strongly, triangular flow more strongly than the elliptic flow. Strong fluctuations greatly reduce the sensitivity of elliptic and triangular flow to viscosity.
The effect of diamagnetic flows on turbulent driven ion toroidal rotation
Lee, J. P. [Courant Institute of Mathematical Sciences, New York University, New York, New York 10003 (United States)] [Courant Institute of Mathematical Sciences, New York University, New York, New York 10003 (United States); Barnes, M. [Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States)] [Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States); Parra, F. I. [Rudolf Peierls Centre for Theoretical Physics, Oxford University, Oxford OX1 3NP (United Kingdom)] [Rudolf Peierls Centre for Theoretical Physics, Oxford University, Oxford OX1 3NP (United Kingdom); Belli, E. A.; Candy, J. [General Atomics, San Diego, California 92121 (United States)] [General Atomics, San Diego, California 92121 (United States)
2014-05-15T23:59:59.000Z
Turbulent momentum redistribution determines the radial profile of rotation in a tokamak. The momentum transport driven by diamagnetic flow effects is an important piece of the radial momentum transport for sub-sonic rotation, which is often observed in experiments. In a non-rotating state, the diamagnetic flow and the E × B flow must cancel. The diamagnetic flow and the E × B flow have different effects on the turbulent momentum flux, and this difference in behavior induces intrinsic rotation. The momentum flux is evaluated using gyrokinetic equations that are corrected to higher order in the ratio of the poloidal Larmor radius to the minor radius, which requires evaluation of the diamagnetic corrections to Maxwellian equilibria. To study the momentum transport due to diamagnetic flow effects, three experimental observations of ion rotation are examined. First, a strong pressure gradient at the plasma edge is shown to result in a significant inward momentum transport due to the diamagnetic effect, which may explain the observed peaking of rotation in a high confinement mode. Second, the direction of momentum transport is shown to change as collisionality increases, which is qualitatively consistent with the observed reversal of intrinsic rotation by varying plasma density and current. Last, the dependence of the intrinsic momentum flux on the magnetic shear is found, and it may explain the observed rotation changes in the presence of lower hybrid current drive.
Geodesic deviation at higher orders via covariant bitensors
Justin Vines
2014-07-25T23:59:59.000Z
We review a simple but instructive application of the formalism of covariant bitensors, to use a deviation vector field along a fiducial geodesic to describe a neighboring worldline, in an exact and manifestly covariant manner, via the exponential map. Requiring the neighboring worldline to be a geodesic leads to the usual linear geodesic deviation equation for the deviation vector, plus corrections at higher order in the deviation and relative velocity. We show how these corrections can be efficiently computed to arbitrary orders via covariant bitensor expansions, deriving a form of the geodesic deviation equation valid to all orders, and producing its explicit expanded form through fourth order. We also discuss the generalized Jacobi equation, action principles for the higher-order geodesic deviation equations, results useful for describing accelerated neighboring worldlines, and the formal general solution to the geodesic deviation equation through second order.
Application of Mass Lumped Higher Order Finite Elements
Chen, J.; Strauss, H. R.; Jardin, S. C.; Park, W.; Sugiyama, L. E.; Fu., G.; Breslau, J.
2005-11-01T23:59:59.000Z
There are many interesting phenomena in extended-MHD such as anisotropic transport, mhd, 2-fluid effects stellarator and hot particles. Any one of them challenges numerical analysts, and researchers are seeking for higher order methods, such as higher order finite difference, higher order finite elements and hp/spectral elements. It is true that these methods give more accurate solution than their linear counterparts. However, numerically they are prohibitively expensive. Here we give a successful solution of this conflict by applying mass lumped higher order finite elements. This type of elements not only keep second/third order accuracy but also scale closely to linear elements by doing mass lumping. This is especially true for second order lump elements. Full M3D and anisotropic transport models are studied.
Synchronization of piece-wise continuous systems of fractional order
Marius-F. Danca
2014-08-19T23:59:59.000Z
The aim of this study is to prove analytically that synchronization of a piece-wise continuous class of systems of fractional order can be achieved. Based on our knowledge, there are no numerical methods to integrate differential equations with discontinuous right hand side of fractional order which model these systems. Therefore, via Filippov's regularization [1] and Cellina's Theorem [2,3], we prove that the initial value problem can be converted into a continuous problem of fractional-order, to which numerical methods for fractional orders apply. In this way, the synchronization problem transforms into a standard problem for continuous systems of fractional order. Three examples of fractional-order piece-wise systems are considered: Sprott system, Chen and Shimizu-Morioka system.
Solyndra Facts vs. Fiction: Cash Flow Modeling
Broader source: Energy.gov [DOE]
Questions have been raised about a quote selectively pulled from an Aug. 20, 2009 email to make it look like Solyndra would run out of cash by Sept. 2011. To be clear, the analysis addressed in that email did not refer to Solyndra’s corporate cash flow, but rather the cash flow for a subsidiary of Solyndra – the “Fab 2 Project Company.
HYPERSONIC FLOW COMPUTATIONS ON UNSTRUCTURED MESHES
Peraire, Jaime
97--0625 HYPERSONIC FLOW COMPUTATIONS ON UNSTRUCTURED MESHES K. L. Bibb \\Lambda NASA Langley hypersonic flow over complex configurations using unstructured meshes is presented. The unstructured grid for a sphereÂcone configuration at Mach numbers of 5.25 and 10.6, and a complex hypersonic reÂentry vehicle
Non-Darcy flow in geothermal reservoirs
Zyvoloski, G.
1982-01-01T23:59:59.000Z
The effects of non-Darcy flow laws are investigated for two geothermal reservoir types: multiphase and Hot Dry Rock (HDR). Long-term thermal behavior is emphasized as short-term pressure transient behavior is addressed in the oil field literature. Comparisons of Darcy and non-Darcy flow laws are made.
Scaling bounds on dissipation in turbulent flows
Seis, Christian
2015-01-01T23:59:59.000Z
We present a new rigorous method for estimating statistical quantities in fluid dynamics such as the (average) energy dissipation rate directly from the equations of motion. The method is tested on shear flow, channel flow, Rayleigh--B\\'enard convection and porous medium convection.
Integrable magnetic geodesic flows on Lie groups
Alexey A. Magazev; Igor V. Shirokov; Yuriy Y. Yurevich
2011-11-03T23:59:59.000Z
Right-invariant geodesic flows on manifolds of Lie groups associated with 2-cocycles of corresponding Lie algebras are discussed. Algebra of integrals of motion for magnetic geodesic flows is considered and necessary and sufficient condition of integrability in quadratures is formulated. Canonic forms for 2-cocycles of all 4-dimensional Lie algebras are given and integrable cases among them are separated.
Conservation Law Models for Traffic Flow
Bressan, Alberto
Conservation Law Models for Traffic Flow Alberto Bressan Mathematics Department, Penn State University http://www.math.psu.edu/bressan/ Alberto Bressan (Penn State) Scalar Conservation Laws 1 / 117 #12;Review of hyperbolic conservation laws Models of traffic flow, on a single road and on a network of roads
Flow Split Venturi, Axially-Rotated Valve
Walrath, David E. (Laramie, WY); Lindberg, William R. (Laramie, WY); Burgess, Robert K. (Sheridan, WY); LaBelle, James (Murrieta, CA)
2000-02-22T23:59:59.000Z
The present invention provides an axially-rotated valve which permits increased flow rates and lower pressure drop (characterized by a lower loss coefficient) by using an axial eccentric split venturi with two portions where at least one portion is rotatable with respect to the other portion. The axially-rotated valve typically may be designed to avoid flow separation and/or cavitation at full flow under a variety of conditions. Similarly, the valve is designed, in some embodiments, to produce streamlined flow within the valve. An axially aligned outlet may also increase the flow efficiency. A typical cross section of the eccentric split venturi may be non-axisymmetric such as a semicircular cross section which may assist in both throttling capabilities and in maximum flow capacity using the design of the present invention. Such a design can include applications for freeze resistant axially-rotated valves and may be fully-opened and fully-closed in one-half of a complete rotation. An internal wide radius elbow typically connected to a rotatable portion of the eccentric venturi may assist in directing flow with lower friction losses. A valve actuator may actuate in an axial manner yet be uniquely located outside of the axial flow path to further reduce friction losses. A seal may be used between the two portions that may include a peripheral and diametrical seal in the same plane. A seal separator may increase the useful life of the seal between the fixed and rotatable portions.
DIFFERENTIAL EQUATIONS FOR FLOW IN RESERVOIRS By ...
2008-08-23T23:59:59.000Z
Darcy's law for each phase with a simple differential material balance for each phase. In this first ... that the pressure declines in the direction of flow. .... lies within some closed curve C across which there is no flow, and fluid injec- tion and ...
Quantitative supersonic flow visualization by hydraulic analogy
Rani, Sarma Laxminarasimha
1998-01-01T23:59:59.000Z
The hydraulic analogy, which forms the basis for the phics. current investigation, can be used to study supersonic gas flows with great ease by means of a water table. As a result of the analogy, water heights in free surface water flow correspond...
Second-Order Fermions and the Standard Model
Espin, Johnny
2015-01-01T23:59:59.000Z
We present a construction of a non-hermitian fermionic Lagrangian which has a second-order kinetic term. Despite the non-hermicity of the latter, the theory is unitary and the perturbation theory that can be derived is equivalent to the usual one derived from a first-order formalism. Having this in mind, the construction of a second-order Standard Model allows a more compact description of the theory. This work is based on [1, 2] and citations therein.
Projective synchronization in fractional order chaotic systems and its control
Chunguang Li
2006-04-24T23:59:59.000Z
The chaotic dynamics of fractional (non-integer) order systems have begun to attract much attention in recent years. In this paper, we study the projective synchronization in two coupled fractional order chaotic oscillators. It is shown that projective synchronization can also exist in coupled fractional order chaotic systems. A simple feedback control method for controlling the scaling factor onto a desired value is also presented.
Task Order Price Evaluation Worksheet for SUPER ESPC | Department...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Document provides a worksheet for evaluating price for a task order as part of a Super Energy Savings Performance Contract (ESPC). priceevalworksheet.doc More Documents &...
Executive Order 13592: Improving American Indian and Alaska Native...
Office of Environmental Management (EM)
America, I hereby order as follows: Section 1. Policy. The United States has a unique political and legal relation- ship with the federally recognized American Indian and Alaska...
American Indian Policy and Relevant DOE and Executive Orders...
Services Communication & Engagement Tribal Programs American Indian Policy and Relevant DOE and Executive Orders American Indian Policy and Relevant DOE and Executive...
The Constant Rank Condition and Second Order Constraint ...
2009-11-13T23:59:59.000Z
Nov 13, 2009 ... The Constant Rank condition for feasible points of nonlinear ... stant Rank condition is, in addition, a second order constraint qualification.