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Note: This page contains sample records for the topic "dispersion manifolds perforated" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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1

The Construction of Zonal Models of Dispersion in Channels via Matched Centre Manifolds  

E-Print Network (OSTI)

Taylor's model of dispersion simply describes the long-term spread of material along a pipe, channel or river. However, often we need multi-mode models to resolve finer details in space and time. Here we construct zonal models of dispersion via the new principle of matching their long-term evolution with that of the original problem. Using centre manifold techniques this is done straightforwardly and systematically. Furthermore, this approach provides correct initial and boundary conditions for the zonal models. We expect the proposed principle of matched centre manifold evolution to be useful in a wide range of modelling problems.

S. D. Watt; A. J. Roberts

1994-12-02T23:59:59.000Z

2

Perforated Patch Recording  

Science Journals Connector (OSTI)

Perforated patch recording is a special configuration in patch clamp recording that allows to measure whole?...

2006-01-01T23:59:59.000Z

3

Dispersal  

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

Dispersal Dispersal Nature Bulletin No. 675-A April 15, 1978 Forest Preserve District of Cook County George W. Dunne, President Roland F. Eisenbeis, Supt. of Conservation SEED DISPERSAL Plants that scatter their seeds widely have a better chance to survive than those which do not. Different kinds spread their seeds in various special ways. Many seeds ride the wind. Maple seeds spin away like little helicopters with a single wing. In a strong breeze they can travel a city block. Those of the elm are small papery disks with a seed in the center. The ash seed and its wing resembles a canoe paddle. In the basswood a few seeds are suspended beneath a large flat blade that glides through the air. Ripe, dry pine cones open and release winged seeds hidden between the cone scales.

4

Origami manifolds  

E-Print Network (OSTI)

An origami manifold is a manifold equipped with a closed 2-form which is symplectic everywhere except on a hypersurface, where it is a folded form whose kernel defines a circle fibration. In this thesis I explain how an ...

Pissarra Pires, Ana Rita

2010-01-01T23:59:59.000Z

5

Manifold Integration: Data Integration on Multiple Manifolds  

E-Print Network (OSTI)

In data analysis, data points are usually analyzed based on their relations to other points (e.g., distance or inner product). This kind of relation can be analyzed on the manifold of the data set. Manifold learning is an approach to understand...

Choi, Hee Youl

2011-08-08T23:59:59.000Z

6

High power laser perforating tools and systems  

DOE Patents (OSTI)

ystems devices and methods for the transmission of 1 kW or more of laser energy deep into the earth and for the suppression of associated nonlinear phenomena. Systems, devices and methods for the laser perforation of a borehole in the earth. These systems can deliver high power laser energy down a deep borehole, while maintaining the high power to perforate such boreholes.

Zediker, Mark S; Rinzler, Charles C; Faircloth, Brian O; Koblick, Yeshaya; Moxley, Joel F

2014-04-22T23:59:59.000Z

7

Oriented perforations -- A rock mechanics view  

SciTech Connect

Hydraulic fracture initiation dictates the communication path between the wellbore and fracture plane. Nonplanar fracture geometries such as multiple, T-Shaped, and reoriented fractures are not advantageous and they adversely affect the potential to achieve a desired stimulation treatment. Oriented perforations can be the solution to initiate a single wide fracture in vertical and deviated wells. Also oriented perforations may be used to create stable tunnels in poorly consolidated formations thus avoiding sand failure and consequently preventing sand production. This paper presents laboratory experimental results related to oriented perforations for hydraulic fracturing. It also discusses the use of oriented perforation for sand control. Experiments were designed to investigate the effect of perforation orientation in vertical and horizontal wells on hydraulic fracturing treatment.

Abass, H.H.; Meadows, D.L.; Brumley, J.L.; Hedayati, S.; Venditto, J.J.

1995-11-01T23:59:59.000Z

8

Edge compression manifold apparatus  

DOE Patents (OSTI)

A manifold for connecting external capillaries to the inlet and/or outlet ports of a microfluidic device for high pressure applications is provided. The fluid connector for coupling at least one fluid conduit to a corresponding port of a substrate that includes: (i) a manifold comprising one or more channels extending therethrough wherein each channel is at least partially threaded, (ii) one or more threaded ferrules each defining a bore extending therethrough with each ferrule supporting a fluid conduit wherein each ferrule is threaded into a channel of the manifold, (iii) a substrate having one or more ports on its upper surface wherein the substrate is positioned below the manifold so that the one or more ports is aligned with the one or more channels of the manifold, and (iv) device to apply an axial compressive force to the substrate to couple the one or more ports of the substrate to a corresponding proximal end of a fluid conduit.

Renzi, Ronald F. (Tracy, CA)

2007-02-27T23:59:59.000Z

9

Laser perforation of screen vacuum thermal insulation  

Science Journals Connector (OSTI)

This paper presents the results of the process of laser perforation of screen vacuum thermal insulation and shows that it has high efficiency. The use of various types of IR lasers...

Sysoev, V K; Vyatlev, P A; Zakharchenko, A V

2007-01-01T23:59:59.000Z

10

Manifold tool guide  

DOE Patents (OSTI)

A tool guide is described that makes possible the insertion of cleaning and/or inspection tools into a manifold pipe that will dislocate and extract the accumulated sediment in such manifold pipes. The tool guide basically comprises a right angled tube (or other angled tube as required) which can be inserted in a large tube and locked into a radially extending cross pipe by adjustable spacer rods and a spring-loaded cone, whereby appropriate cleaning tools can be inserted into the cross pipe for cleaning, inspection, etc. 3 figs.

Djordjevic, A.

1983-12-27T23:59:59.000Z

11

Manifold tool guide  

DOE Patents (OSTI)

A tool guide that makes possible the insertion of cleaning and/or inspection tools into a manifold pipe that will dislocate and extract the accumulated sediment in such manifold pipes. The tool guide basically comprises a right angled tube (or other angled tube as required) which can be inserted in a large tube and locked into a radially extending cross pipe by adjustable spacer rods and a spring-loaded cone, whereby appropriate cleaning tools can be inserted into to cross pipe for cleaning, inspection, etc.

Djordjevic, A.

1982-07-08T23:59:59.000Z

12

Manifold tool guide  

DOE Patents (OSTI)

A tool guide that makes possible the insertion of cleaning and/or inspection tools into a manifold pipe that will dislocate and extract the accumulated sediment in such manifold pipes. The tool guide basically comprises a right angled tube (or other angled tube as required) which can be inserted in a large tube and locked into a radially extending cross pipe by adjustable spacer rods and a spring-loaded cone, whereby appropriate cleaning tools can be inserted into to cross pipe for cleaning, inspection, etc.

Djordjevic, Aleksandar (Thousand Oaks, CA)

1983-12-27T23:59:59.000Z

13

Dual manifold heat pipe evaporator  

DOE Patents (OSTI)

An improved evaporator section for a dual manifold heat pipe. Both the upper and lower manifolds can have surfaces exposed to the heat source which evaporate the working fluid. The tubes in the tube bank between the manifolds have openings in their lower extensions into the lower manifold to provide for the transport of evaporated working fluid from the lower manifold into the tubes and from there on into the upper manifold and on to the condenser portion of the heat pipe. A wick structure lining the inner walls of the evaporator tubes extends into both the upper and lower manifolds. At least some of the tubes also have overflow tubes contained within them to carry condensed working fluid from the upper manifold to pass to the lower without spilling down the inside walls of the tubes.

Adkins, Douglas R. (Albuquerque, NM); Rawlinson, K. Scott (Albuquerque, NM)

1994-01-01T23:59:59.000Z

14

Dual manifold heat pipe evaporator  

DOE Patents (OSTI)

An improved evaporator section is described for a dual manifold heat pipe. Both the upper and lower manifolds can have surfaces exposed to the heat source which evaporate the working fluid. The tubes in the tube bank between the manifolds have openings in their lower extensions into the lower manifold to provide for the transport of evaporated working fluid from the lower manifold into the tubes and from there on into the upper manifold and on to the condenser portion of the heat pipe. A wick structure lining the inner walls of the evaporator tubes extends into both the upper and lower manifolds. At least some of the tubes also have overflow tubes contained within them to carry condensed working fluid from the upper manifold to pass to the lower without spilling down the inside walls of the tubes. 1 figure.

Adkins, D.R.; Rawlinson, K.S.

1994-01-04T23:59:59.000Z

15

Dispersant solutions for dispersing hydrocarbons  

DOE Patents (OSTI)

A dispersant solution includes a hydrocarbon dispersing solution derived from a bacterium from ATCC 75527, ATCC 75529, or ATCC 55638.

Tyndall, R.L.

1997-03-11T23:59:59.000Z

16

Perforation of thin unreinforced concrete slabs  

SciTech Connect

This report discusses fourteen tests which were conducted to investigate the perforation of thin unreinforced concrete slabs. The 4340-steel projectile used in the test series is 50.8 mm in diameter, 355.6 mm in length, has a mass of 2.34 kg. and an ogive nose with caliber radius head of 3. The slabs, contained within steel culverts, are 1.52 m in diameter and consist of concrete with a nominal unconfined compressive strength of 38.2 MPa and maxima aggregate size of 9.5 mm. Slab thicknesses are 284.4, 254.0, 215.9 and 127.0 mm. Tests were conducted at impact velocities of about 313 m/s on all slab thicknesses and about 379 and 471 m/s on the 254.0-mm-thick slab. All tests were conducted at normal incidence to the slab. All tests were conducted at normal incidence to the slab. Information obtained from the tests used to determine the loading (deceleration) on the projectile during the perforation process, the velocity-displacement of the projectile as it perforated the slab, and the projectile position as damage occurred on the backface of the slab. The test projectile behaved essentially as a rigid body for all of the tests.

Cargile, J.D. [Army Engineer Waterways Experiment Station, Vicksburg, MS (United States); Giltrud, M.E. [Defense Nuclear Agency, Washington, DC (United States); Luk, V.K. [Sandia National Labs., Albuquerque, NM (United States)

1993-10-01T23:59:59.000Z

17

The instrumented dynamic perforation test applied to a composite shell  

E-Print Network (OSTI)

The instrumented dynamic perforation test applied to a composite shell S. Pattofatto, H. Tsitsiris Wilson, F-94230 Cachan, France Abstract. Perforation tests are commonly used on composites but give limited results. In this study, a single layer of a thermoplastic woven composite is tested at high

Paris-Sud XI, Université de

18

Shelling in low dimensional manifolds  

E-Print Network (OSTI)

1974) William Owen Murray IV, B. S. , Southwest Texas State University Chairman of Advisory Committee: Dr. L. B. Treybig The main objective of this thesis is to present some results concerning shelling of 3-cells contained in triangulated 3...-manifolds. These results will include some extensions of a theorem by Treybig which states that every compact 3-manifold has a triangulation in which every 3-cell, which is the union of 3-simplexes of the tri- angulation, can be shelled, Also, a...

Murray, William Owen

2012-06-07T23:59:59.000Z

19

Evaluation of Perforated Carbonate Cores Under Acid Stimulation  

E-Print Network (OSTI)

-moving jet of particles, which is able to pass through the gun body, casing, cement and formation in the same way as conventional charges. Then the liner materials deposited in the perforation tunnels react exothermically, generating heat and pressure... generates a secondary reaction immediately after deployment. This exothermic reaction is driven by the liner metallurgic properties, resulting in an increase of 11 temperature and pressure in the perforation tunnels. The increase in pressure causes...

Diaz, Nerwing Jose

2011-10-21T23:59:59.000Z

20

Locating an atmospheric contamination source using slow manifolds Wenbo Tang,1  

E-Print Network (OSTI)

the origin of atmospheric particle pollution from dispersed particle positions, provided that diffusion efLocating an atmospheric contamination source using slow manifolds Wenbo Tang,1 George Haller,2,a-dimensional atmospheric wind field in an urban street canyon. © 2009 American Institute of Physics. DOI: 10

Tang, Wenbo

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


21

Subcritical Stein manifolds are split K. Cieliebak  

E-Print Network (OSTI)

Subcritical Stein manifolds are split K. Cieliebak April 30, 2002 1 Introduction This note concerns the following little observation. Theorem 1.1. Every subcritical Stein manifold (domain) is deformation equiv domains are compact, whereas Stein manifolds are noncompact. Subcritical. It is well

Cieliebak, Kai

22

Selectively fired, tubing-conveyed perforating guns save rig time  

SciTech Connect

Selective firing of tubing-conveyed perforating (TCP) guns during drill stem tests (DSTs) added flexibility and saved costs for Marathon Oil Co. As an example, in the Garland field in Wyoming, the guns allowed perforating multiple zones in one trip. This saved 1 1/2--2 days/well in rig time and $25,000--30,000/well in electric wire line and DST tool charges. For international offshore operations, savings of $200,000/well appear possible. Savings result not only from perforating multiple zones, but also from arbitrarily setting firing patterns with or without zone isolation. The paper describes the testing of equipment, the design of the guns, firing heads, crossover assembly, pressure isolation sub, control line, and select-fire sub, and applications for the guns.

Snider, P.M. (Marathon Oil Co., Houston, TX (United States)); Bond, P.L. (Halliburton Energy Services, Dallas, TX (United States))

1993-07-19T23:59:59.000Z

23

Characterization of cardiac lead perforation risk via a dynamic simulated environment  

E-Print Network (OSTI)

Delayed cardiac perforation is a serious medical condition where an implanted cardiac lead migrates through the heart wall, causing life-threatening complications. Where acute perforation occurs during implant, delayed ...

Rosario, Matthew J

2012-01-01T23:59:59.000Z

24

Measuring aerosols generated inside armoured vehicles perforated by depleted uranium ammunition  

Science Journals Connector (OSTI)

......armoured vehicles perforated by depleted uranium ammunition M. A. Parkhurst...significance of exposure to depleted uranium (DU), the US Department of...armoured vehicles perforated by depleted uranium ammunition. | In response to......

M. A. Parkhurst

2003-07-01T23:59:59.000Z

25

Tubing pressurized firing apparatus for a tubing conveyed perforating gun  

SciTech Connect

A tubing pressurized firing apparatus is shown for use with a tubing conveyed perforating gun of the type used to perforate a cased well bore. The firing apparatus has a tubular body with an upper end for connection in the well tubing string and with a lower end for connection to a well perforating gun. An inner mandrel is slidably mounted within the tubular body and has a ball seat formed in the interior bore thereof for receiving a ball dropped through the well tubing string. The ball and ball seat together form a pressure tight seal whereby tubing pressure in the well tubing string acts on the inner mandrel to slide the mandrel downwardly within the tubular body. A cocking mechanism located below the inner mandrel within the body includes a lockout member which is initially positioned between a detonating pin and a percussion detonator. The cocking mechanism is actuated by downward sliding movement of the inner mandrel to move the lockout member from between the detonating pin and percussion detonator whereby a subsequent release of tubing pressure and upward sliding movement of the inner mandrel exposes the detonating pin to the percussion detonator to actuate the detonator and fire the perforating gun.

Davies, D. L.

1985-11-26T23:59:59.000Z

26

Construction of Conformally Compact Einstein Manifolds  

E-Print Network (OSTI)

We produce some explicit examples of conformally compact Einstein manifolds, whose conformal compactifications are foliated by Riemannian products of a closed Einstein manifold with the total space of a principal circle bundle over products of Kahler-Einstein manifolds. We compute the associated conformal invariants, i.e., the renormalized volume in even dimensions and the conformal anomaly in odd dimensions. As a by-product, we obtain some Riemannian products with vanishing Q-curvature.

Dezhong Chen

2009-08-11T23:59:59.000Z

27

Manifold seal for fuel cell stack assembly  

DOE Patents (OSTI)

An assembly for sealing a manifold to a stack of fuel cells includes a first resilient member for providing a first sealing barrier between the manifold and the stack. A second resilient member provides a second sealing barrier between the manifold and the stack. The first and second resilient members are retained in such a manner as to define an area therebetween adapted for retaining a sealing composition.

Schmitten, Phillip F. (N. Huntingdon, PA); Wright, Maynard K. (Bethel Park, PA)

1989-01-01T23:59:59.000Z

28

Hamilton Dynamics on Clifford Kaehler Manifolds  

E-Print Network (OSTI)

This paper presents Hamilton dynamics on Clifford Kaeler manifolds. In the end, the some results related to Clifford Kaehler dynamical systems are also discussed.

Mehmet Tekkoyun

2009-02-24T23:59:59.000Z

29

Seed Dispersal  

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

Seed Dispersal Seed Dispersal Nature Bulletin No. 35 October 6, 1945 Forest Preserve District of Cook County Clayton F, Smith, President Roberts Mann, Superintendent of Conservation SEED DISPERSAL Plants have various ways of spreading their seeds. Some have "fly-away" seeds. Included are the dandelion, thistle, tumbleweed, cattail, clematis, and many trees. The cottonwood, sycamore, aspen, linden, ailanthus, maple, box elder, birch and the pines are all trees having seeds with wings or with "down", that are carried by winds. Certain aquatic plants have seeds that sink to bury themselves in.the mud beneath the water. Others have seeds that float and are distributed by the winds and currents that carry them away. Many plants "shoot" their seeds, the seed pods popping open with sufficient force to throw the seeds many feet away, Notable in this group are knotgrass, lady slippers, violets, vetches, jewel weed, witch- hazel, and Heavea, the Para rubber tree, The witch-hazel may shoot its seeds 30 or 40 feet.

30

GEODESIC INTERSECTIONS IN ARITHMETIC HYPERBOLIC 3-MANIFOLDS  

E-Print Network (OSTI)

GEODESIC INTERSECTIONS IN ARITHMETIC HYPERBOLIC 3-MANIFOLDS Kerry N. Jones Alan W. Reid Abstract. It was shown by Chinburg and Reid that there exist closed hyperbolic 3-manifolds in which all closed geodesics closed geodesics simple and disjoint. The natural conjecture arose that the Chinburg-Reid examples also

Jones, Kerry N.

31

Optimal Transportation on Sub-Riemannian Manifolds  

E-Print Network (OSTI)

Optimal Transportation on Sub-Riemannian Manifolds Ludovic Rifford Universit´e de Nice - Sophia Antipolis (Joint work with A. Figalli) Ludovic Rifford Optimal Transportation on Sub-Riemannian Manifolds #12;Outline I. Statement of our optimal transportation problem II. Sketch of proof of the Mc

Rifford, Ludovic

32

Optimal Transportation on Sub-Riemannian Manifolds  

E-Print Network (OSTI)

Optimal Transportation on Sub-Riemannian Manifolds Ludovic Rifford Universit´e de Nice - Sophia Antipolis (Joint work with A. Figalli) Ludovic Rifford Optimal Transportation on Sub-Riemannian Manifolds #12;Monge's Optimal Transportation Problem Let M be a separable metric space equipped with its Borel

Rifford, Ludovic

33

Obstructions to Pin Structures on Kleinian Manifolds  

E-Print Network (OSTI)

We develop various topological notions on four-manifolds of Kleinian signature $(- - + +)$. In particular, we extend the concept of `Kleinian metric homotopy' to non-orientable manifolds. We then derive the topological obstructions to pin-Klein cobordism, for all of the pin groups. Finally, we discuss various examples and applications which arise from this work.

L. J. Alty; A. Chamblin

1995-05-03T23:59:59.000Z

34

Magnetic Resonance Imaging (MRI) of PEM Dehydration and Gas Manifold...  

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

Resonance Imaging (MRI) of PEM Dehydration and Gas Manifold Flooding During Continuous Fuel Cell Operation. Magnetic Resonance Imaging (MRI) of PEM Dehydration and Gas Manifold...

35

Application of High Powered Lasers to Perforated Completions  

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

Congress on Applications of Laser & Electro-Optics Congress on Applications of Laser & Electro-Optics October 13 - 16, 2003, Jacksonville, Florida Application of High Powered Lasers to Perforated Completions Zhiyue Xu, Claude B. Reed and Keng H. Leong Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 R. A. Parker Parker Geoscience Consulting, LLC, 6346 Secrest Street, Arvada, CO 80403 R. M. Graves, Petroleum Engineering Department, Colorado School of Mines, Golden, CO 80401 ABSTRACT As part of the process of drilling an oil or gas well, a steel production casing is often inserted to the bottom of the well and sealed with cement against the productive formation. Openings must be made through the steel casing wall and cement and into the rock formation to allow formation fluid to enter the well. Conventionally, a perforator is

36

Perforated plates for cryogenic regenerators and method of fabrication  

DOE Patents (OSTI)

Perforated plates (10) having very small holes (14) with a uniform diameter throughout the plate thickness are prepared by a "wire drawing" process in which a billet of sacrificial metal is disposed in an extrusion can of the plate metal, and the can is extruded and restacked repeatedly, converting the billet to a wire of the desired hole diameter. At final size, the rod is then sliced into wafers, and the wires are removed by selective etching. This process is useful for plate metals of interest for high performance regenerator applications, in particular, copper, niobium, molybdenum, erbium, and other rare earth metals. Er.sub.3 Ni, which has uniquely favorable thermophysical properties for such applications, may be incorporated in regions of the plates by providing extrusion cans (20) containing erbium and nickel metals in a stacked array (53) with extrusion cans of the plate metal, which may be copper. The array is heated to convert the erbium and nickel metals to Er.sub.3 Ni. Perforated plates having two sizes of perforations (38, 42), one of which is small enough for storage of helium, are also disclosed.

Hendricks, John B. (Huntsville, AL)

1994-01-01T23:59:59.000Z

37

Perforated plates for cryogenic regenerators and method of fabrication  

DOE Patents (OSTI)

Perforated plates having very small holes with a uniform diameter throughout the plate thickness are prepared by a [open quotes]wire drawing[close quotes] process in which a billet of sacrificial metal is disposed in an extrusion can of the plate metal, and the can is extruded and restacked repeatedly, converting the billet to a wire of the desired hole diameter. At final size, the rod is then sliced into wafers, and the wires are removed by selective etching. This process is useful for plate metals of interest for high performance regenerator applications, in particular, copper, niobium, molybdenum, erbium, and other rare earth metals. Er[sub 3]Ni, which has uniquely favorable thermophysical properties for such applications, may be incorporated in regions of the plates by providing extrusion cans containing erbium and nickel metals in a stacked array with extrusion cans of the plate metal, which may be copper. The array is heated to convert the erbium and nickel metals to Er[sub 3]Ni. Perforated plates having two sizes of perforations, one of which is small enough for storage of helium, are also disclosed. 10 figures.

Hendricks, J.B.

1994-03-29T23:59:59.000Z

38

Inflow performance relationship for perforated wells producing from solution gas drive reservoir  

SciTech Connect

The IPR curve equations, which are available today, are developed for open hole wells. In the application of Nodal System Analysis in perforated wells, an accurate calculation of pressure loss in the perforation is very important. Nowadays, the equation which is widely used is Blount, Jones and Glaze equation, to estimate pressure loss across perforation. This equation is derived for single phase flow, either oil or gas, therefore it is not suitable for two-phase production wells. In this paper, an IPR curve equation for perforated wells, producing from solution gas drive reservoir, is introduced. The equation has been developed using two phase single well simulator combine to two phase flow in perforation equation, derived by Perez and Kelkar. A wide range of reservoir rock and fluid properties and perforation geometry are used to develop the equation statistically.

Sukarno, P. [Inst. Teknologi Bandung (Indonesia); Tobing, E.L.

1995-10-01T23:59:59.000Z

39

E-Print Network 3.0 - acquired perforating dermatosis Sample...  

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

Biology and Medicine ; Environmental Sciences and Ecology 8 Managing Performance vs. Accuracy Trade-offs With Loop Perforation Summary: Managing Performance vs. Accuracy...

40

E-Print Network 3.0 - acute gallbladder perforation Sample Search...  

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

semantic searches, or searches based on concepts... in which the order of the search terms does not matter. For example, a search for "perforated gallbladder... " will match...

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


41

E-Print Network 3.0 - armoured vehicles perforated Sample Search...  

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

Powered by Explorit Topic List Advanced Search Sample search results for: armoured vehicles perforated Page: << < 1 2 3 4 5 > >> 1 Super Bainite (High Hardness) Steel Super...

42

Project Development Specification for Valve Pit Manifold  

SciTech Connect

Establishes the performance, design development, and test requirements for the valve pit manifolds. The system engineering approach was used to develop this document in accordance with the guidelines laid out in the Systems Engineering Management Plan for Project W-314.

MCGREW, D.L.

2000-09-28T23:59:59.000Z

43

Dispersed Indeterminacy  

E-Print Network (OSTI)

A state of a single particle can be represented by a quantum blob in the corresponding phase space, or by a cell in its 2-D subspace. Its area is frequently stated to be no less than one half of the Plank constant, implying that such a cell is an indivisible quantum of the 2-D phase space. But this is generally not true, as is evident, for instance, from representation of some states in the basis of innately discrete observables like angular momentum. Here we consider some dispersed states involving the evanescent waves (EW) different from that in the total internal reflection. Such states are represented by a set of separated point-like cells, but with a large total indeterminacy. An idealized model has a discrete Wigner function forming an infinite periodic array of dots on the phase plane. The question about the total momentum indeterminacy in such state is discussed. We argue that the transverse momentum eigenstates corresponding to the considered EW-s cannot be singled out by any known measurement procedure, and the whole infinite set of the corresponding eigenvalues can contribute only a certain fraction to the observed momentum indeterminacy which remains finite.

Moses Fayngold

2014-02-05T23:59:59.000Z

44

How perforation shot density affects gas well performance  

SciTech Connect

The single gas well model is formulated using the systems analysis approach and is composed of three main modules. The first module is the modified inflow performance relationship (IPR). This IPR accounts for pressure drops through the reservoir, laminar skin and damaged, compacted zone around casing perforations. The second module is the tubing outflow performance computed via the Cullender and Smith method. The third module is the gas material balance equation for computing average well pressure with a given gas production level. By coupling this equation with the computed inflow and outflow results, future gas deliverability and economic return of a gas well can then be projected.

Cheng, A.M.C.

1988-03-01T23:59:59.000Z

45

Chapter 12 - Dispersants  

Science Journals Connector (OSTI)

Three dispersants were prepared to address dispersancy concerns associated with conductive nanotubes, cement, and pigment colorants used in ink jets. In the first case conductive nanotubes were dispersed in water by ultrasounding a mixture of nanotubes with polymeric pyridinium ionic salts. A cement dispersant consisting of a polyether containing polyacrylic acid successfully passed the 15 Hit Flow Rate. Finally ink jet colorants Lithol Rubin and Phthalo were dispersed in water using ethylene-propylene oxide polymers with minimum viscosity increase.

Thomas F. DeRosa

2013-01-01T23:59:59.000Z

46

Mechanical seal having a single-piece, perforated mating ring  

DOE Patents (OSTI)

A mechanical seal (e.g., single mechanical seals, double mechanical seals, tandem mechanical seals, bellows, pusher mechanical seals, and all types of rotating and reciprocating machines) with reduced contact surface temperature, reduced contact surface wear, or increased life span. The mechanical seal comprises a rotating ring and a single-piece, perforated mating ring, which improves heat transfer by controllably channeling coolant flow through the single-piece mating ring such that the coolant is in substantially uniform thermal contact with a substantial portion of the interior surface area of the seal face, while maintaining the structural integrity of the mechanical seal and minimizing the potential for coolant flow interruptions to the seal face caused by debris or contaminants (e.g., small solids and trash) in the coolant.

Khonsari, Michael M. (Baton Rouge, LA); Somanchi, Anoop K. (Fremont, CA)

2007-08-07T23:59:59.000Z

47

Low temperature thermal transport in partially perforated silicon nitride membranes.  

SciTech Connect

The thermal transport in partially trenched silicon nitride membranes has been studied in the temperature range from 0.3 to 0.6 K, with the transition edge sensor (TES), the sole source of membrane heating. The test configuration consisted of Mo/Au TESs lithographically defined on silicon nitride membranes 1 {micro}m thick and 6 mm{sup 2} in size. Trenches with variable depth were incorporated between the TES and the silicon frame in order to manage the thermal transport. It was shown that sharp features in the membrane surface, such as trenches, significantly impede the modes of phonon transport. A nonlinear dependence of thermal resistance on trench depth was observed. Partial perforation of silicon nitride membranes to control thermal transport could be useful in fabricating mechanically robust detector devices.

Yefremenko, V.; Wang, G.; Novosad, V.; Datesman, A.; Pearson, J.; Divan, R.; Chang, C. L.; Downes, T. P.; Mcmahon, J. J.; Bleem, L. E.; Crites, A. T.; Meyer, S. S.; Carlstrom, J. E.; Univ. of Chicago

2009-05-04T23:59:59.000Z

48

Betti numbers of a class of barely G2 manifolds  

E-Print Network (OSTI)

We calculate explicitly the Betti numbers of a class of barely G2 manifolds - that is, G2 manifolds that are realised as a product of a Calabi-Yau manifold and a circle, modulo an involution. The particular class which we consider are those spaces where the Calabi-Yau manifolds are complete intersections of hypersurfaces in products of complex projective spaces and the involutions are free acting.

Sergey Grigorian

2009-09-25T23:59:59.000Z

49

SYMPLECTIC TOPOLOGY ON SUBCRITICAL MANIFOLDS PAUL BIRAN AND KAI CIELIEBAK  

E-Print Network (OSTI)

SYMPLECTIC TOPOLOGY ON SUBCRITICAL MANIFOLDS PAUL BIRAN AND KAI CIELIEBAK 1. Introduction The study of the symplectic topology of Stein manifolds leads naturally to two distinct subclasses: subcritical and critical. A Stein manifold is called subcritical if it admits a plurisubharmonic function which has only critical

Cieliebak, Kai

50

Connections on statistical manifolds of density operators by geometry of  

E-Print Network (OSTI)

of statistical manifolds, that is of manifolds whose points can be identified with density functions with respect to a certain measure µ. The classical references for the theory can be found in the books [1, 2, 4Connections on statistical manifolds of density operators by geometry of noncommutative Lp -spaces

Isola, Tommaso

51

Reflection of Waterborne acoustic waves from a viscoelastic layer on a rigid hacking with perforations  

Science Journals Connector (OSTI)

The reflection coefficient is calculated for a plane acoustic wave normally incident on a viscoelasticrubber cover layer submerged in water. The rubber layer is mounted on a rigid backing with air?filled cylindrical perforations. Acoustical losses are attributed to motion of the layer over the perforations. This motion is calculated by treating the layer above each perforation as a vibrating circular viscoelastic plate. Different boundary conditions are assumed and in each case the soundreflection coefficient is calculated. The results are compared with the experimental data of R. Lane [Ultrason. 19 2830 (1981)].

J. Jarzynski

1982-01-01T23:59:59.000Z

52

Measuring aerosols generated inside armoured vehicles perforated by depleted uranium ammunition  

Science Journals Connector (OSTI)

......War about the health significance of exposure to depleted uranium (DU), the...perforated by depleted uranium ammunition...War about the health significance of exposure to depleted uranium (DU), the......

M. A. Parkhurst

2003-07-01T23:59:59.000Z

53

A study of the effects of casing perforations on the production rates of wells  

E-Print Network (OSTI)

, Analogy Between Electrical and Pluid Syntone. . . . . 14 2A Diagran of Electrolytic Tash , 2B Diagrsn of Cased Role 2C Radial Distribution of Perforations ~ ~ 15 16 2D Vertical Distribution of Perforations . . . ~ The Effect of Well Sore Resistance... on tha Relative Productivity of a Well Using the Electric Analog Nodal ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ '16 The Ratio of Non-Steady State Plow ro Steady Stats Plow Versus Relative Depletion Tine for Various Well Bore Resistances...

Sanderlin, James Lewis

2012-06-07T23:59:59.000Z

54

Energy-momentum balance in particle - domain wall perforating collision  

E-Print Network (OSTI)

We investigate the energy-momentum balance in the perforating collision of a point particle with an infinitely thin planar domain wall within the linearized gravity in arbitrary dimensions. Since the metric of the wall increases with distance, the wall and the particle are never free, and their energy-momentum balance involves not only the instantaneous kinetic momenta, but also the non-local contribution of gravitational stresses. However, careful analysis shows that the stresses can be unambiguously divided between the colliding objects leading to definition of the gravitationally dressed momenta. These take into account for gravity in the same way as the potential energy does in the non-relativistic theory, but our treatment is fully relativistic. Another unusual feature of our problem is the non-vanishing flux of the total energy-momentum tensor through the lateral surface of the world tube. In this case the zero divergence of the energy-momentum tensor does not imply conservation of the total momentum de...

Gal'tsov, D V; Spiirin, P A

2014-01-01T23:59:59.000Z

55

Energy-momentum balance in particle - domain wall perforating collision  

E-Print Network (OSTI)

We investigate the energy-momentum balance in the perforating collision of a point particle with an infinitely thin planar domain wall within the linearized gravity in arbitrary dimensions. Since the metric of the wall increases with distance, the wall and the particle are never free, and their energy-momentum balance involves not only the instantaneous kinetic momenta, but also the non-local contribution of gravitational stresses. However, careful analysis shows that the stresses can be unambiguously divided between the colliding objects leading to definition of the gravitationally dressed momenta. These take into account for gravity in the same way as the potential energy does in the non-relativistic theory, but our treatment is fully relativistic. Another unusual feature of our problem is the non-vanishing flux of the total energy-momentum tensor through the lateral surface of the world tube. In this case the zero divergence of the energy-momentum tensor does not imply conservation of the total momentum defined as the integral over the space-like section of the tube. But one can still define the conservation low infinitesimally, passing to time derivatives of the momenta. Using this definition we establish the momentum balance in terms of the dressed particle and wall momenta.

D. V. Gal'tsov; E. Yu. Melkumova; P. A. Spiirin

2014-11-01T23:59:59.000Z

56

Port-Hamiltonian systems on discrete manifolds  

E-Print Network (OSTI)

This paper offers a geometric framework for modeling port-Hamiltonian systems on discrete manifolds. The simplicial Dirac structure, capturing the topological laws of the system, is defined in terms of primal and dual cochains related by the coboundary operators. This finite-dimensional Dirac structure, as discrete analogue of the canonical Stokes-Dirac structure, allows for the formulation of finite-dimensional port-Hamiltonian systems that emulate the behaviour of the open distributed-parameter systems with Hamiltonian dynamics.

Marko Seslija; Jacquelien M. A. Scherpen; Arjan van der Schaft

2012-01-27T23:59:59.000Z

57

THE GEOMETRIES OF 3-MANIFOLDS PETER SCOTT  

E-Print Network (OSTI)

that each smooth path on S2 has a length, namely its length as a path in £3 . (I shall consistently use ETHE GEOMETRIES OF 3-MANIFOLDS PETER SCOTT Page §1. The 2-dimensional geometries 405 §2. Geometric. The eight 3-dimensional geometries 441 E3 443 H3 448 S3 449 S2 x U 457 fPxM 459 SL2U 462 Nil 467 Sol 470 §5

Schleimer, Saul

58

Simultaneous Learning of Nonlinear Manifolds Based on the Bottleneck Neural Network  

Science Journals Connector (OSTI)

Manifold learning methods are important techniques for nonlinear extraction of high-dimensional data structures. These methods usually extract a global manifold for data. However, in many real-world problems, there is not only one global manifold, but ... Keywords: Deep structure, Manifold learning, Manifold separation, Multitask learning, Neural network, Virtual pattern

Seyyede Zohreh Seyyedsalehi, Seyyed Ali Seyyedsalehi

2014-10-01T23:59:59.000Z

59

Dispersion strengthened copper  

DOE Patents (OSTI)

A composition of matter is described which is comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide. A method for making this composition of matter is also described. This invention relates to the art of powder metallurgy and, more particularly, it relates to dispersion strengthened metals.

Sheinberg, H.; Meek, T.T.; Blake, R.D.

1990-01-09T23:59:59.000Z

60

How to project `circular' manifolds using geodesic distances?  

E-Print Network (OSTI)

How to project `circular' manifolds using geodesic distances? John Aldo Lee, Michel Verleysen,verleysen}@dice.ucl.ac.be Abstract. Recent papers have clearly shown the advantage of using the geodesic distance instead strongly crumpled manifolds have to be un- folded. Nevertheless, neither the Euclidean nor the geodesic

Verleysen, Michel

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


61

Geodesic Regression on Riemannian Manifolds P. Thomas Fletcher  

E-Print Network (OSTI)

Geodesic Regression on Riemannian Manifolds P. Thomas Fletcher School of Computing, University a manifold-valued random variable and a real-valued independent parameter. The principle is to fit a geodesic is evaluated as the sum-of-squared geodesic distances from the model to the data, and this provides

Boyer, Edmond

62

Geometric integration: numerical solution of differential equations on manifolds  

Science Journals Connector (OSTI)

...such as rigid bodies and the Solar System. Conserved quantities...long-term integration of the solar system by Wisdom & Holman...investigate the stability of the solar system, it was essential to...manifold invariant is greatly assisted when M is a homogeneous manifold...

1999-01-01T23:59:59.000Z

63

Heat Kernel for Open Manifolds Trevor H. Jones  

E-Print Network (OSTI)

Heat Kernel for Open Manifolds Trevor H. Jones 22nd July, 2010 Abstract It is known that for open manifolds with bounded geometry, the differential form heat kernel exists and is unique. Furthermore, it has been shown that the components of the differential form heat kernel are related via the exterior

Jones, Trevor H.

64

GRASSMANN MANIFOLDS OF JORDAN ALGEBRAS Abstract. We show that, in a JB-algebra, the projections form a Banach manifold  

E-Print Network (OSTI)

GRASSMANN MANIFOLDS OF JORDAN ALGEBRAS Cho-Ho Chu Abstract. We show that, in a JB symmetric space of compact type, for n N {0}. 1. Introduction The close connection between Jordan algebras is to address these issues, and indeed, we study manifolds of projections in JB-algebras using only real Jordan

65

Dispersed flow film boiling  

E-Print Network (OSTI)

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 ...

Yoder, Graydon L.

1980-01-01T23:59:59.000Z

66

Dispersion strengthened copper  

DOE Patents (OSTI)

A composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide, and a method for making this composition of matter.

Sheinberg, Haskell (Los Alamos, NM); Meek, Thomas T. (Knoxville, TN); Blake, Rodger D. (Santa Fe, NM)

1990-01-01T23:59:59.000Z

67

Dispersion strengthened copper  

DOE Patents (OSTI)

A composition of matter comprised of copper and particles which are dispersed throughout the copper, where the particles are comprised of copper oxide and copper having a coating of copper oxide, and a method for making this composition of matter.

Sheinberg, Haskell (Los Alamos, NM); Meek, Thomas T. (Knoxville, TN); Blake, Rodger D. (Santa Fe, NM)

1989-01-01T23:59:59.000Z

68

Smith theory and irreducible holomorphic symplectic manifolds  

E-Print Network (OSTI)

We study the cohomological properties of the fixed locus $X^G$ of an automorphism group $G$ of prime order $p$ acting on a variety $X$ whose integral cohomology is torsion-free. We obtain an precise relation between the mod $p$ cohomology of $X^G$ and natural invariants for the action of $G$ on the integral cohomology of $X$. We apply these results to irreducible holomorphic symplectic manifolds of deformation type of the Hilbert scheme of two points on a K3 surface: the main result of this paper is a formula relating the dimension of the mod $p$ cohomology of $X^G$ with the rank and the discriminant of the invariant lattice in the second cohomology space with integer coefficients of $X$.

Boissiere, Samuel; Sarti, Alessandra

2012-01-01T23:59:59.000Z

69

Well-productivity improvement by use of rapid overpressured perforation extension: Case history  

SciTech Connect

This paper describes an overbalance perforating and surging technique used as a pretreatment to hydraulic fracturing of the Romeo interval at Prudhoe Bay. Operation conditions, surface and bottomhole pressure (BHP) measurements, and modeling results are presented and discussed. Well productivity and the amount of proppant placed are compared with results in offset wells where the technique was not used.

Coueet, B.; Petitjean, L.M. [Schlumberger-Doll Research, Ridgefield, CT (United States); Abel, J.C.; Schmidt, J.H.; Ferguson, K.R.

1996-02-01T23:59:59.000Z

70

Heat transfer and thermodynamic performance of a parabolic trough receiver with centrally placed perforated plate inserts  

Science Journals Connector (OSTI)

Abstract In this paper, a numerical investigation of thermal and thermodynamic performance of a receiver for a parabolic trough solar collector with perforated plate inserts is presented. The analysis was carried out for different perforated plate geometrical parameters including dimensionless plate orientation angle, the dimensionless plate spacing, and the dimensionless plate diameter. The Reynolds number varies in the range 1.02נ104?Re?7.38נ105 depending on the heat transfer fluid temperature. The fluid temperatures used are 400K, 500K, 600K and 650K. The porosity of the plate was fixed at 0.65. The study shows that, for a given value of insert orientation, insert spacing and insert size, there is a range of Reynolds numbers for which the thermal performance of the receiver improves with the use of perforated plate inserts. In this range, the modified thermal efficiency increases between 1.2% and 8%. The thermodynamic performance of the receiver due to inclusion of perforated plate inserts is shown to improve for flow rates lower than 0.01205m3/s. Receiver temperature gradients are shown to reduce with the use of inserts. Correlations for Nusselt number and friction factor were also derived and presented.

Aggrey Mwesigye; Tunde Bello-Ochende; Josua P. Meyer

2014-01-01T23:59:59.000Z

71

Eulerian simulation of the perforation of aluminum plates by nondeforming projectiles  

SciTech Connect

A new algorithm for the treatment of sliding interfaces between solids with or without friction in an Eulerian wavecode is described. The algorithm has been implemented in the two-dimensional version of the CTH code. The code was used to simulate penetration and perforation of aluminum plates by rigid, conical-nosed tungsten projectiles. Comparison with experimental data is provided.

Silling, S.A.

1992-03-01T23:59:59.000Z

72

KISMET tungsten dispersal experiment  

SciTech Connect

Results of the KISMET tungsten dispersal experiment indicate a relatively small degree of wall-rock contamination caused by this underground explosive experiment. Designed as an add-on to the KISMET test, which was performed in the U-1a.02 drift of the LYNER facility at Nevada Test Site on 1 March 1995, this experiment involved recovery and analysis of wall-rock samples affected by the high- explosive test. The chemical, high-explosive blast drove tungsten powder, placed around the test package as a plutonium analog, into the surrounding wall- rock alluvium. Sample analyses by an analytical digital electron microscope (ADEM) show tungsten dispersed in the rock as tiny (<10 {mu}m) particles, agglomerates, and coatings on alluvial clasts. Tungsten concentrations, measured by energy dispersive spectral analysis on the ADEM, indicate penetration depths less than 0.1 m and maximum concentrations of 1.5 wt % in the alluvium.

Wohletz, K.; Kunkle, T.; Hawkins, W.

1996-12-01T23:59:59.000Z

73

Fixed points, stable manifolds, weather regimes, and their predictability  

In a simple, one-layer atmospheric model, we study the links between low-frequency variability and the models fixed points in phase space. The model dynamics is characterized by the coexistence of multiple weather regimes. To investigate the transitions from one regime to another, we focus on the identification of stable manifolds associated with fixed points. We show that these manifolds act as separatrices between regimes. We track each manifold by making use of two local predictability measures arising from the meteorological applications of nonlinear dynamics, namely, bred vectors and singular vectors. These results are then verified in the framework of ensemble forecasts issued from clouds (ensembles) of initial states. The divergence of the trajectories allows us to establish the connections between zones of low predictability, the geometry of the stable manifolds, and transitions between regimes.

Deremble, Bruno; D'Andrea, Fabio; Ghil, Michael [Univ. of California, Los Angeles, CA (United Staes). Atmospheric and Oceanic Sciences and Institute of Geophysics and Planetary Physics

2009-10-27T23:59:59.000Z

74

Modified Curvatures on Manifolds with Boundary and Applications  

Science Journals Connector (OSTI)

To study the reflecting diffusion processes on manifolds with boundary, some new curvature operators are introduced by using the Bakry-Emery curvature and the second fundamental form. As applications, the grad...

Feng-Yu Wang

2014-10-01T23:59:59.000Z

75

The Slow Manifold of a Five-Mode Model  

Science Journals Connector (OSTI)

The slow manifold of an inviscid five-mode model introduced by Lorenz is investigated. When the influence of the gravity modes on the Rossby modes is neglected, the analytical solution given by Lorenz and Krishnamurthy is generalized. When ...

John P. Boyd

1994-04-01T23:59:59.000Z

76

On the ultraviolet behaviour of quantum fields over noncommutative manifolds  

E-Print Network (OSTI)

By exploiting the relation between Fredholm modules and the Segal-Shale-Stinespring version of canonical quantization, and taking as starting point the first-quantized fields described by Connes' axioms for noncommutative spin geometries, a Hamiltonian framework for fermion quantum fields over noncommutative manifolds is introduced. We analyze the ultraviolet behaviour of second-quantized fields over noncommutative 3-tori, and discuss what behaviour should be expected on other noncommutative spin manifolds.

Varilly, J C; Varilly, Joseph C.; Gracia-Bondia, Jose M.

1999-01-01T23:59:59.000Z

77

Renormalization, unstable manifolds, and the fractal structure of mode locking  

SciTech Connect

The apparent universality of the fractal dimension of the set of quasiperiodic windings at the onset of chaos in a wide class of circle maps is described by construction of a universal one-parameter family of maps which lies along the unstable manifold of the renormalization group. The manifold generates a universal ''devil's staircase'' whose dimension agrees with direct numerical calculations. Applications to experiments are discussed.

Cvitanovic, P.; Jensen, M.H.; Kadanoff, L.P.; Procaccia, I.

1985-07-22T23:59:59.000Z

78

The presence of perforated synapses in the striatum after dopamine depletion, is this a sign of maladaptive brain plasticity?  

Science Journals Connector (OSTI)

......depletion, is this a sign of maladaptive brain plasticity? Veronica Anaya-Martinez...number of perforated synapses, suggesting brain plasticity that might be deleterious for...both during development and in the mature brain, is thus based upon the strengthening......

Vernica Anaya-Martnez; Ana Luisa Gutierrez-Valdez; Jose Luis Ordoez-Librado; Enrique Montiel-Flores; Javier Snchez-Betancourt; Csar Snchez Vzquez del Mercado; Leonardo Reynoso-Erazo; Roco Tron-Alvarez; Maria Rosa Avila-Costa

2014-12-01T23:59:59.000Z

79

An elastic-perfectly plastic flow model for finite element analysis of perforated materials  

SciTech Connect

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.

Jones, D.P.; Gordon, J.L.; Hutula, D.N.; Banas, D.; Newman, J.B.

1999-02-01T23:59:59.000Z

80

Tympanic-Membrane Perforation as a Marker of Concussive Brain Injury in Iraq  

Science Journals Connector (OSTI)

...principally in the form of roadside improvised explosive devices (IEDs), continues to be the signature mechanism of injury for coalition forces in Iraq. In 2005, the U.S. military reported 10,953 IED attacks, at an average of 30 per day. Combat body armor provides soldiers with considerable protection... This study evaluated 210 U.S. soldiers after blast injury in Iraq. There was a significant association between tympanic-membrane perforation and concussive brain injury.

2007-08-23T23:59:59.000Z

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


81

Determination of dispersivities from a natural-gradient dispersion test  

E-Print Network (OSTI)

, and radioactive wastes. Contaminant hydrogeology is presently a focal point in the realm of hydrologic modeling. Generally, models are designed to represent simplified versions of reality and The style and format of this document was taken from the Journal... dispersivities, v ia a graphical approach, from a natural-gradient dispersion test in which artificial pollution was injected into an aquifer. The dispersion test was conducted by Sud icky et al. (1983) in order to characterize the dispersive properties...

Hoover, Caroline Marie

1985-01-01T23:59:59.000Z

82

3, 895923, 2006 Dispersivity behavior  

E-Print Network (OSTI)

in ground-water remediation or protection work. Dispersivity is established as one of the key uncertain

Paris-Sud XI, Université de

83

Nozzle for electric dispersion reactor  

DOE Patents (OSTI)

A nozzle for an electric dispersion reactor includes two concentric electrodes, the inner one of the two delivering disperse phase fluid into a continuous phase fluid. A potential difference generated by a voltage source creates a dispersing electric field at the end of the inner electrode.

Sisson, Warren G. (Oak Ridge, TN); Basaran, Osman A. (Oak Ridge, TN); Harris, Michael T. (Knoxville, TN)

1998-01-01T23:59:59.000Z

84

Nozzle for electric dispersion reactor  

DOE Patents (OSTI)

A nozzle for an electric dispersion reactor includes two concentric electrodes, the inner one of the two delivering disperse phase fluid into a continuous phase fluid. A potential difference generated by a voltage source creates a dispersing electric field at the end of the inner electrode. 4 figs.

Sisson, W.G.; Basaran, O.A.; Harris, M.T.

1998-04-14T23:59:59.000Z

85

Closed manifolds with transcendental L2-Betti numbers.  

E-Print Network (OSTI)

In this paper, we show how to construct examples of closed manifolds with explicitly computed irrational, even transcendental L2 Betti numbers, defined via the universal covering. We show that every non-negative real number shows up as an L2-Betti number of some covering of a compact manifold, and that many computable real numbers appear as an L2-Betti number of a universal covering of a compact manifold (with a precise meaning of computable given below). In algebraic terms, for many given computable real numbers (in particular for many transcendental numbers) we show how to construct a finitely presented group and an element in the integral group ring such that the L2-dimension of the kernel is the given number. We follow the method pioneered by Austin in "Rational group ring elements with kernels having irrational dimension" arXiv:0909.2360) but refine it to get very explicit calculations which make the above statements possible.

Mikal Pichot (University of Tokyo (IPMU)); Thomas Schick (Georg-August-Universitt Gttingen); Andrzej Zuk (Paris 7)

86

The Conjugate Linearized Ricci Flow on Closed 3-Manifolds  

E-Print Network (OSTI)

We characterize the conjugate linearized Ricci flow and the associated backward heat kernel on closed three--manifolds of bounded geometry. We discuss their properties, and introduce the notion of Ricci flow conjugated constraint sets which characterizes a way of Ricci flow averaging metric dependent geometrical data. We also provide an integral representation of the Ricci flow metric itself and of its Ricci tensor in terms of the heat kernel of the conjugate linearized Ricci flow. These results, which readily extend to closed n-dimensional manifolds, yield for various conservation laws, monotonicity and asymptotic formulas for the Ricci flow and its linearization.

Mauro Carfora

2007-10-17T23:59:59.000Z

87

Phonon dispersion in graphene  

E-Print Network (OSTI)

Taking into account the constraints imposed by the lattice symmetry, the phonon dispersion is calculated for graphene with interactions between the first and second nearest neighbors in the framework of the Born-von Karman model. Analytical expressions are obtained for the out-of-plane (bending) modes determined only by two force constants as well as for the in-plane modes with four force constants. Values of the force constants are found in fitting to elastic constants and Raman frequencies observed in graphite.

L. A. Falkovsky

2007-02-17T23:59:59.000Z

88

A Family of Discriminative Manifold Learning Algorithms and Their Application to Speech Recognition  

Science Journals Connector (OSTI)

This paper presents a family of discriminative manifold learning approaches to feature space dimensionality reduction in noise robust automatic speech recognition (ASR). The specific goal of these techniques is to preserve local manifold structure in ...

Vikrant Singh Tomar; Richard C. Rose

2014-01-01T23:59:59.000Z

89

Phonon dispersion in graphene  

Science Journals Connector (OSTI)

Taking into account constraints imposed by the lattice symmetry we calculate analytically [1] the phonon dispersion for graphene with interactions between first and second neighbors. We find that the out?of?plane (bending) modes are not coupled with in?plane modes and described only with two force constants one of which is determined by the corresponding Raman frequency and another by the smallest elastic constant C44. In contrast to calculations by Saito et al we find the linear dispersion of the bending (out?of?plane) mode around the ? point with a small but finite sound velocity =1.57 km/s. The sound velocity of this mode is very sensitive to small variations of the force constants. The sound velocities of in?plane modes are = 20.3 km/s and =13.1 km/s. Because of the lack of information for graphene we compare the present theory with experiments on graphite. The low phonon frequencies in the critical points turn out less than their values in graphite since the atoms in graphene are more free to move in the out?of?plane direction in comparison with graphite. Accuracy of the comparison can be estimated using the value of the observed splitting of the ZA and ZO' modes in graphite which is around 130 1/cm. [1] L.A. Falkovsky cond?mat/0702409.

Leonid A. Falkovsky

2008-01-01T23:59:59.000Z

90

Intrinsic Mean Shift for Clustering on Stiefel and Grassmann Manifolds Hasan Ertan C etingul Rene Vidal  

E-Print Network (OSTI)

Intrinsic Mean Shift for Clustering on Stiefel and Grassmann Manifolds Hasan Ertan C¸ eting¨ul Ren

91

Performance characteristics of a perforated shadow band under clear sky conditions  

SciTech Connect

A perforated, non-rotating shadow band is described for separating global solar irradiance into its diffuse and direct normal components using a single pyranometer. Whereas shadow bands are normally solid so as to occult the sensor of a pyranometer throughout the day, the proposed band has apertures cut from its circumference to intermittently expose the instrument sensor at preset intervals. Under clear sky conditions the device produces a saw tooth waveform of irradiance data from which it is possible to reconstruct separate global and diffuse curves. The direct normal irradiance may then be calculated giving a complete breakdown of the irradiance curves without need of a second instrument or rotating shadow band. This paper describes the principle of operation of the band and gives a mathematical model of its shading mask based on the results of an optical ray tracing study. An algorithm for processing the data from the perforated band system is described and evaluated. In an extended trial conducted at NREL's Solar Radiation Research Laboratory, the band coupled with a thermally corrected Eppley PSP produced independent curves for diffuse, global and direct normal irradiance with low mean bias errors of 5.6 W/m{sup 2}, 0.3 W/m{sup 2} and -2.6 W/m{sup 2} respectively, relative to collocated reference instruments. Random uncertainties were 9.7 W/m{sup 2} (diffuse), 17.3 W/m{sup 2} (global) and 19.0 W/m{sup 2} (direct). When the data processing algorithm was modified to include the ray trace model of sensor exposure, uncertainties increased only marginally, confirming the effectiveness of the model. Deployment of the perforated band system can potentially increase the accuracy of data from ground stations in predominantly sunny areas where instrumentation is limited to a single pyranometer. (author)

Brooks, Michael J. [School of Mechanical Engineering, University of KwaZulu-Natal, Durban (South Africa)

2010-12-15T23:59:59.000Z

92

The Complexity of Geodesic Voronoi Diagrams on Triangulated 2-Manifold Surfaces  

E-Print Network (OSTI)

The Complexity of Geodesic Voronoi Diagrams on Triangulated 2-Manifold Surfaces Yong-Jin Liu1 , Kai 2-manifold surface, based on the geodesic metric. Given a triangulated 2-manifold T of n faces T, the Voronoi diagram of a set of point sites based on the geodesic metric (called below geodesic

Tang, Kai

93

A MANIFOLD THAT DOES NOT CONTAIN A COMPACT CORE Gerard A. Venema  

E-Print Network (OSTI)

A MANIFOLD THAT DOES NOT CONTAIN A COMPACT CORE Gerard A. Venema June 2, 1997 A b s t r ac t . A core of a (noncompact) manifold is a submanifold with the property that the inclusion to contain a compact core even though the manifold has the homotopy type of a finite complex. 1. Introduction

Venema, Gerard

94

VOLUMES OF HYPERBOLIC 3MANIFOLDS OF BETTI NUMBER AT LEAST 3  

E-Print Network (OSTI)

VOLUMES OF HYPERBOLIC 3­MANIFOLDS OF BETTI NUMBER AT LEAST 3 ANDREW PRZEWORSKI Abstract. We provide a new, simpler proof of the fact that the smallest volume hyperbolic 3­manifold has betti number­manifold has betti number at least 3, then its volume is at least 0.94689 and hence it is not the smallest

Przeworski, Andrew

95

White noise analysis on manifolds and the energy representation of a gauge group  

E-Print Network (OSTI)

The energy representation of a gauge group on a Riemannian manifold has been discussed by several authors. Y. Shimada has shown the irreducibility for compact Riemannian manifold, using white noise analysis. In this paper we extend its technique to noncompact Riemannian manifolds which have differential operators satisfying some conditions.

Takahiro Hasebe

2011-01-15T23:59:59.000Z

96

Generic measures for geodesic flows on nonpositively curved manifolds  

E-Print Network (OSTI)

Generic measures for geodesic flows on nonpositively curved manifolds Yves Coud`ene, Barbara the generic invariant probability measures for the geodesic flow on connected complete nonpositively curved subset of the set of all probability measures invariant by the geodesic flow. The proof of K. Sigmund

Paris-Sud XI, Université de

97

INTEGRABILITY OF GEODESIC FLOWS AND ISOSPECTRALITY OF RIEMANNIAN MANIFOLDS  

E-Print Network (OSTI)

INTEGRABILITY OF GEODESIC FLOWS AND ISOSPECTRALITY OF RIEMANNIAN MANIFOLDS DOROTHEE SCHUETH are isospectral for the Laplace operator on functions and such that M has completely integrable geodesic flow of the submanifolds of the unit tangent bundle given by two maximal continuous families of closed geodesics

Schüth, Dorothee

98

TOPOLOGICAL PROPERTIES OF ESCHENBURG SPACES AND 3-SASAKIAN MANIFOLDS  

E-Print Network (OSTI)

, AND WOLFGANG ZILLER Riemannian manifolds with positive sectional curvature have been a frequent topic of global by (a, b, c) = (2279, 1603, 384) and (2528, 939, 799) with r = 5143925. The two 3-Sasakian metrics sectional curvature, although the 3-Sasakian metric never has positive curvature. They are special cases

Ziller, Wolfgang

99

Manifold Identification in Dual Averaging for Regularized Stochastic ...  

E-Print Network (OSTI)

dimensional manifold of parameter space along which the regularizer is smooth. (When an ?1 ...... Proof To measure the cardinality of the complement of St, that is, Sc t := {1,2,...,t}\\St, ..... the median (rather than the mean) and the standard deviation. The table also ...... Statistics and its Interface, 1:137153, 2008. I. Vaisman.

2012-06-01T23:59:59.000Z

100

Data assimilation on the exponentially accurate slow manifold  

Science Journals Connector (OSTI)

...Michael K. Davey and John M. Huthnance Data assimilation on the exponentially accurate...climate system . I describe an approach to data assimilation making use of an explicit...conditions near the slow manifold, allowing data assimilation to be performed without introducing...

2013-01-01T23:59:59.000Z

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


101

Heat kernel on connected sums of Riemannian manifolds  

E-Print Network (OSTI)

Heat kernel on connected sums of Riemannian manifolds@math.cornell.edu May 1999 1 Introduction This note is about the heat kernel on a connected sum M of non-compact man- ifolds M1, M2, ..., Mk assuming that one knows enough about the heat kernels for each Mi

Grigor'yan, Alexander

102

Nano dispersion amplified waveguide structures  

Science Journals Connector (OSTI)

A highly dispersive waveguide structure is proposed tocefficiently compress and expand ultra short pulses in a package forming a sufficiently small footprint. A sub-wavelength...

Brown, J; Johnson, Eric; Moharam, M

2004-01-01T23:59:59.000Z

103

Environmental Pollution Air Pollution Dispersion Practical Air Pollution Dispersion  

E-Print Network (OSTI)

Environmental Pollution Air Pollution Dispersion 1 of 5 Practical ­ Air Pollution Dispersion in the lectures how such models can be used to explain observed concentrations of air pollutants in an area and to test `what-if' scenarios for pollution control and reduction. You will use the Gaussian Plume Model

Moncrieff, John B.

104

First laboratory perforating tests in coal show lower-than-expected penetration  

SciTech Connect

Worldwide Coal Bed Methane (CBM) resources are huge, estimated at 3,000 to 9,000 Tcf. The production rate from CBM reservoirs is low, perhaps 50-100 mcf/day. Various completion methods are being evaluated and new technologies are being developed with the aim of increasing production rates. Considering this interest and activity level, little attention has been paid to the CBM completion fundamentals. Perforating is a critical part of this process, especially considering the PRB development migration from single-coal, open-hole completions into multi-zone, cased-hole completions. This paper describes the first known laboratory-testing program to investigate shaped charge penetration in coal targets. We describe mechanical properties of the coals tested, and penetration results for different shaped charges (of different designs), shot at various stress conditions. CT scan and cutaway imaging of the perforation tunnels are also discussed. Tests were conducted under dry and saturated conditions. The preliminary experiments reported here indicate that shaped charge penetration in coal is significantly less than expected, considering the target's density and strength. The authors provide insight into what may be the reasons for these unexpected results and recommend a path forward for shaped charge testing, designs, predictive tools, and how to optimize CBM completions.

Snider, P.M.; Walton, I.C.; Skinner, T.K.; Atwood, D.C.; Grove, B.M.; Graham, C.

2008-06-15T23:59:59.000Z

105

Well productivity improvement using extreme overbalanced perforating and surging-case history  

SciTech Connect

This paper describes overbalanced perforating and surging operations as a pretreatment to hydraulic fracturing for the Romeo interval at Prudhoe Bay. Operation conditions are presented and discussed, as well as surface and bottomhole pressure measurements. Well productivity and the amount of proppant placed are compared to results in offset wells where the technique was not applied. The paper shows how the use of the technique allows placement of small, highly conductive fractures in intervals that were not previously considered fracturing candidates due to the close proximity to the gas/oil contact (GOC). The paper also shows pressure transient analysis affirming the technique as a stand-alone stimulation. It is shown that the use of extreme overbalanced perforating and surging treatments prior to hydraulic fracturing produces a substantial increase both in the success rate and the efficiency of the hydraulic fracturing operation and in the production rate of the wells that are pretreated. Finally, a comparison between pressure data and a new radial fracture propagation model shows a good match. The model demonstrates that high-energy treatment can significantly increase the extension and the height of the fracture; this was corroborated by downhole pressure measurements recorded during one overbalance treatment and by well logs.

Petitjean, L.; Coueet, B.; Abel, J.C. [and others

1995-12-31T23:59:59.000Z

106

Design of compact micro-perforated membrane absorbers for polycarbonate pane in automobile  

Science Journals Connector (OSTI)

Polycarbonate (PC) laminate is gradually substituted for the glass as window pane in automobile. Absorption performance of PC pane is poor using resin membrane between two folders of pane because of the low acoustic impedance of membrane. Micro-perforated absorbers can provide high absorption coefficients. However, the depths of air cavity were all over the 50mm in past studies. In this paper, a compact and efficient micro-perforated membrane (MPM) absorber is designed as a combination of baffle-resonator and Helmholtz-resonator with sub-millimeter holes backed by an air space. Absorption coefficients of MPM absorbers are predicted by equivalent electric-acoustic circuit analysis method. This paper presents three different MPM materials of polypropylene, polyethylene, and carbon polyester respectively. The numerical results shows that absorption performance of PC pane can be improved using double layer MPM absorber and the whole thickness of MPM absorber is not exceed 10mm to meet the structural requirement of PC pane application in automobile.

Shen Min; Kazuteru Nagamura; Noritoshi Nakagawa; Masaharu Okamura

2013-01-01T23:59:59.000Z

107

Modeling volcanic ash dispersal  

ScienceCinema (OSTI)

Explosive volcanic eruptions inject into the atmosphere large amounts of volcanic material (ash, blocks and lapilli). Blocks and larger lapilli follow ballistic and non-ballistic trajectories and fall rapidly close to the volcano. In contrast, very fine ashes can remain entrapped in the atmosphere for months to years, and may affect the global climate in the case of large eruptions. Particles having sizes between these two end-members remain airborne from hours to days and can cover wide areas downwind. Such volcanic fallout entails a serious threat to aircraft safety and can create many undesirable effects to the communities located around the volcano. The assessment of volcanic fallout hazard is an important scientific, economic, and political issue, especially in densely populated areas. From a scientific point of view, considerable progress has been made during the last two decades through the use of increasingly powerful computational models and capabilities. Nowadays, models are used to quantify hazard scenarios and/or to give short-term forecasts during emergency situations. This talk will be focused on the main aspects related to modeling volcanic ash dispersal and fallout with application to the well known problem created by the Eyjafjll volcano in Iceland. Moreover, a short description of the main volcanic monitoring techniques is presented.

None

2011-10-06T23:59:59.000Z

108

Single-trip tubing-conveyed perforating, production testing, and pressure-buildup testing in nonflowing wells  

SciTech Connect

This paper describes tools and procedures for tubing-conveyed perforating (TCP) and subsequent production testing of a well with a reverse-flow jet pump with a specially designed blanking sleeve. A downhole shut-in pressure buildup is also obtained and all equipment is pressure-actuated, eliminating the use of wireline.

Barnes, J.A.; Snider, P.M. (Marathon Oil Co. (US)); Swafford, C.V. (BST Lift Systems (US))

1991-05-01T23:59:59.000Z

109

Interference Fracturing: Non-Uniform Distributions of Perforation Clusters that Promote Simultaneous Growth of Multiple Hydraulic Fractures  

E-Print Network (OSTI)

Simultaneous Growth of Multiple Hydraulic Fractures A.P. Peirce, University of British Columbia and A.P. Bunger in horizontal well stimulation is the generation of hydraulic fractures (HFs) from all perforation clusters shadowing" that refers to suppression of some hydraulic fractures by the compressive stresses exerted

Peirce, Anthony

110

Influence of gas flow rate on liquid distribution in trickle-beds using perforated plates as liquid distributors  

E-Print Network (OSTI)

" the distribution imposed at the top of the reactor. Finally, a comparison between the two measuring techniques-beds reactors, the second will directly affect its performances. Indeed, a bad liquid distribution will not only distribution when fluids distribution on top of the reactor is ensured by a perforated plate. In opposition

Paris-Sud XI, Université de

111

Mapping the surgery exact sequence for topological manifolds to analysis.  

E-Print Network (OSTI)

In this paper we prove the existence of a natural mapping from the surgery exact sequence for topological manifolds to the analytic surgery exact sequence of N. Higson and J. Roe. This generalizes the theorem of N. Higson and J. Roe, that is developed in the smooth setting, using the Lipschitz signature operator of Teleman and the methods elaborated by P. Piazza and T. Schick.

Vito Felice Zenobi

112

Finite Action Yang-Mills Solutions on the Group Manifold  

E-Print Network (OSTI)

We demonstrate that the left (and right) invariant Maurer-Cartan forms for any semi-simple Lie group enable one to construct solutions of the Yang-Mills equations on the group manifold equipped with the natural Cartan-Killing metric. For the unitary unimodular groups the Yang-Mills action integral is finite for such solutions. This is explicitly exhibited for the case of $SU(3)$.

T Dereli; J Schray; Robin W Tucker

1996-05-17T23:59:59.000Z

113

Evaluation of selective vs. point-source perforating for hydraulic fracturing  

SciTech Connect

This paper is a case history comparing and evaluating the effects of fracturing the Reef Ridge Diatomite formation in the Midway-Sunset Field, Kern County, California, using {open_quotes}select-fire{close_quotes} and {open_quotes}point-source{close_quotes} perforating completions. A description of the reservoir, production history, and fracturing techniques used leading up to this study is presented. Fracturing treatment analysis and production history matching were used to evaluate the reservoir and fracturing parameters for both completion types. The work showed that single fractures were created with the point-source (PS) completions, and multiple fractures resulted from many of the select-fire (SF) completions. A good correlation was developed between productivity and the product of formation permeability, net fracture height, bottomhole pressure, and propped fracture length. Results supported the continued development of 10 wells using the PS concept with a more efficient treatment design, resulting in substantial cost savings.

Underwood, P.J.; Kerley, L.

1996-12-31T23:59:59.000Z

114

Measuring Aerosols Generated Inside Armoured Vehicles Perforated by Depleted Uranium Ammunition  

SciTech Connect

In response to questions raised after the Gulf War about the health significance of exposure to depleted uranium (DU), a study was initiated to provide an improved scientific basis for assessment of possible health effects of soldiers in vehicles struck by these munitions. As part of this experimental study, a series of DU penetrators were fired at an Abrams tank and a Bradley fighting vehicle, and the aerosols generated by vehicle perforation were collected and characterized. The aerosol sampling system designed for these tests consisted of filter cassettes, cascade impactors, a five-stage cyclone, and a moving filter. Aerosols collected were analyzed for uranium concentration and particle size distribution as a function of time. The aerosol samples were also analyzed for uranium oxide phases, particle morphology, and in vitro solubility. These data will provide input for use in future prospective and retrospective dose and health risk assessments of DU aerosols.

Parkhurst, MaryAnn

2003-01-01T23:59:59.000Z

115

Ballistic dispersion in temperature gradient focusing  

E-Print Network (OSTI)

regime is the most familiar regime in microfluidic systems, an oft-overlooked regime is that of purely kinematic (or ballistic) dispersion. In most microfluidic systems, this dispersion regime is transient systems. Keywords: microfluidics; temperature gradient focusing; kinematic dispersion; Taylor

Santiago, Juan G.

116

Thermal Ordering in Mixed Nanoclay Dispersions  

Science Journals Connector (OSTI)

This chapter investigates the temperature induced orientational ordering in 1:1 Laponite-MMT dispersion. This dispersion showed thermally activated irreversible conformational phase transition from mostly isot...

Ravi Kumar Pujala

2014-01-01T23:59:59.000Z

117

Controlling particle dispersion in latex paints containing associative thickeners  

Science Journals Connector (OSTI)

Dispersantshigh carboxylate dispersant (polyacrylic acid), a range of dispersants with varying amounts of carboxylate (i.e ... monomer), a hydrophobic dispersant (olefin/maleic acid copo...

Edward Kostansek

2007-12-01T23:59:59.000Z

118

Milnor-Wood inequalities for manifolds locally isometric to a product of hyperbolic planes  

E-Print Network (OSTI)

This note describes sharp Milnor--Wood inequalities for the Euler number of flat oriented vector bundles over closed Riemannian manifolds locally isometric to products of hyperbolic planes. One consequence is that such manifolds do not admit an affine structure, confirming Chern--Sullivan's conjecture in this case. The manifolds under consideration are of particular interest, since in contrary to many other locally symmetric spaces they do admit flat vector bundle of the corresponding dimension. When the manifold is irreducible and of higher rank, it is shown that flat oriented vector bundles are determined completely by the sign of the Euler number.

Bucher, Michelle

2008-01-01T23:59:59.000Z

119

Induced matter: Curved N-manifolds encapsulated in Riemann-flat N+1 dimensional space  

E-Print Network (OSTI)

Liko and Wesson have recently introduced a new 5-dimensional induced matter solution of the Einstein equations, a negative curvature Robertson-Walker space embedded in a Riemann flat 5-dimensional manifold. We show that this solution is a special case of a more general theorem prescribing the structure of certain N+1-dimensional Riemann flat spaces which are all solutions of the Einstein equations. These solutions encapsulate N-dimensional curved manifolds. Such spaces are said to "induce matter" in the sub-manifolds by virtue of their geometric structure alone. We prove that the N-manifold can be any maximally symmetric space.

Harry I. Ringermacher; Lawrence R. Mead

2005-11-02T23:59:59.000Z

120

Special Killing forms on toric Sasaki-Einstein manifolds  

E-Print Network (OSTI)

In this paper we study the interplay between complex coordinates on the Calabi-Yau metric cone and the special Killing forms on the toric Sasaki-Einstein manifold. In the general case we give a procedure to locally construct the special Killing forms. In the final part we exemplify the general scheme in the case of the $5-$dimensional $Y^{p,q}$ spaces, identifying the additional special Killing 2-forms which were previously obtained by the second author of the present paper, but with a different method, in [Mod. Phys. Lett. A 27 (2012) 1250217].

Vladimir Slesar; Mihai Visinescu; Gabriel Eduard Vilcu

2014-03-05T23:59:59.000Z

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


121

Changes in Perforation-Induced Formation Damage With Degree of Underbalance: Comparison of Sandstone and Limestone Formations  

SciTech Connect

Field data and recently developed models provide some guidance for estimating the underbalance needed to obtain fully functional perforations, but there are little data available that relate flow efficiency to lower underbalances in different rock types. To improve understanding of the surge cleanup process, we have performed two series of perforation flow tests in Berea Sandstone and in Bedford Limestone cores at increasing levels of underbalance. Flow tests were performed according to modified API RP43, section 4 test procedures. At the conclusion of the tests, the cores were analyzed using high-resolution X-ray CT techniques. The shape, dimensions and total volumes of both the open tunnel and the remaining embedded liner metal were extracted from the CT data and correlated with the underbalance and with the flow test results. Open tunnel diameters and volumes are much lower in the limestone samples. While the amount of metal remaining in the tunnel and at the perforation tip decreases dramatically with underbalance in Berea Sandstone cores, the amount of metal is nearly constant in the limestone cores. Conversely, the tunnel volume increases with underbalance in the Sandstone cores but stays constant in the limestone. Core flow efficiency results correlate with these observations. There is a sharp increase in CFE in the sandstone samples as the tunnel volumes increase and little change in CFE in the limestone samples corresponding to unchanging tunnel volume. The tests also offer some evidence of the cleanup mechanism at the perforation tip, at least in the sandstone cores. Samples at intermediate underbalance levels show evidence of open tunnel space in an annulus surrounding the metal slug at the tip. This suggests that cleanup may proceed at least partially by axial flow through crushed rock surrounding the metal. As this material erodes away, the metal is loosened and is flushed from the tunnel. Existing models for cleanup are based primarily on radial flow.

Detwiler, R; Halleck, P M; Karacan, C O; Hardesty, J

2003-10-22T23:59:59.000Z

122

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other. 5 figures.

Ikezi, H.; Lin-Liu, Y.R.; DeGrassie, J.S.

1991-08-27T23:59:59.000Z

123

Printed circuit dispersive transmission line  

DOE Patents (OSTI)

A printed circuit dispersive transmission line structure is disclosed comprising an insulator, a ground plane formed on one surface of the insulator, a first transmission line formed on a second surface of the insulator, and a second transmission line also formed on the second surface of the insulator and of longer length than the first transmission line and periodically intersecting the first transmission line. In a preferred embodiment, the transmission line structure exhibits highly dispersive characteristics by designing the length of one of the transmission line between two adjacent periodic intersections to be longer than the other.

Ikezi, Hiroyuki (Rancho Santa Fe, CA); Lin-Liu, Yuh-Ren (San Diego, CA); DeGrassie, John S. (Encinitas, CA)

1991-01-01T23:59:59.000Z

124

A Collapse Surface for Perforated Plates with Triangular Patterns for Ligament Efficiencies Between 0.05 and 0.50  

SciTech Connect

Collapse surfaces are developed for thick perforated plates containing a triangular penetration pattern with ligament efficiencies of 0.05, 0.10, 0.15, 0.2, 0.3, and 0.5 using elastic-perfectly plastic FEA analysis. The FEA data was fit to a fourth-order collapse function which is appropriate for the development of an equivalent solid elastic-perfectly plastic plasticity model for perforated plates with triangular penetration patterns. This type of model can be conveniently used to develop a limit load capability for perforated plate analysis. It was shown that the fourth-order function is reasonable for ligament efficiencies between 0.15 to 0.5. Comparing the fourth-order collapse function to FEA data suggests that an alternate collapse function is needed for ligament efficiencies less than 0.15. A linear interpolation method was shown to be appropriate for ligament efficiencies between 0.15 and 0.5.

D.P. Jones and J.L. Gordon

2000-12-14T23:59:59.000Z

125

Simultaneously enhanced transmission and artificial optical activity in gold film perforated with chiral hole array  

Science Journals Connector (OSTI)

We propose a simple two-dimensional metallic periodic chiral structure (PCS) consisting of a dielectric substrate and a thin gold film perforated with gammadion-shaped chiral hole array, in which the transmittance and artificial optical activity can be simultaneously enhanced. The principle and optical performance of the PCS are demonstrated through the experimental realization of a PCS sample, from numerical design, fabrication, to optical characterization. Good agreement between theory and experiment has been obtained. The PCS sample shows an enhanced transmittance of 53% at wavelength 1168 nm, accompanied nearby by a polarization rotation peak with the effective specific rotatory power up to 105?deg/mm. The enhancement mechanism of the dual effect is thoroughly studied by investigating the optical anomalies (i.e., Rayleigh anomalies, surface plasmon polaritons, and localized surface plasmons) in the PCS and their roles in the light-matter interaction. Several light-anomaly coupling regimes have been revealed. The single-layer metallic PCS is relatively easy to realize in optical frequencies by using mature microfabrication techniques such as electron-beam lithography and lift-off technique. The physical insight into the enhancement mechanism provides guidelines to develop more complicated PCS, such as multilayer PCS with metal and dielectric inclusions, which can produce stronger optical activity and better optical performance.

Benfeng Bai; Janne Laukkanen; Anni Lehmuskero; Jari Turunen

2010-03-15T23:59:59.000Z

126

Measuring Aerosols Generated Inside Armoured Vehicles Perforated by Depleted Uranium Ammunition  

SciTech Connect

In response to questions raised after the Gulf War about the health significance of exposure to depleted uranium (DU), the U.S. Department of Defense initiated a study designed to provide an improved scientific basis for assessment of possible health effects of soldiers in vehicles struck by these munitions. As part of this study, a series of DU penetrators were fired at an Abrams tank and a Bradley fighting vehicle, and the aerosols generated by vehicle perforation were collected and characterized. A robust sampling system was designed to collect aerosols in this difficult environment and to monitor continuously the sampler flow rates. Interior aerosols collected were analyzed for uranium concentration and particle size distribution as a function of time. They were also analyzed for uranium oxide phases, particle morphology, and dissolution in vitro. These data will provide input for future prospective and retrospective dose and health risk assessments of inhaled or ingested DU aerosols. This paper briefly discusses the target vehicles, firing trajectories, aerosol samplers and instrumentation control systems, and the types of analyses conducted on the samples.

Parkhurst, MaryAnn (BATTELLE (PACIFIC NW LAB))

2003-01-01T23:59:59.000Z

127

Time Step Expansions and the Invariant Manifold Approach to Lattice Boltzmann  

E-Print Network (OSTI)

Time Step Expansions and the Invariant Manifold Approach to Lattice Boltzmann Models D.J. Packwood dynamics of a lattice Boltzmann system is to use a combination of different approximations and expan- sions, common to all lattice Boltzmann schemes, give rise to a slow invariant manifold. We perform a time step

Gorban, Alexander N.

128

Projective metric realizations of cone-manifolds with singularities along 2-bridge knots and links  

E-Print Network (OSTI)

Projective metric realizations of cone-manifolds with singularities along 2-bridge knots and links. In particular, for some cone-manifolds with singularities along 2-bridge knots and links we give explicit homogeneous 3-geometries, which are also referred as Thurston geometries: E3 , S3 , H3 , S2 ? R, H2 ? R, SL2(R

129

L-THEORY OF 3-MANIFOLDS WITH NON-VANISHING FIRST BETTI NUMBER  

E-Print Network (OSTI)

L-THEORY OF 3-MANIFOLDS WITH NON-VANISHING FIRST BETTI NUMBER Sayed K. Roushon Abstract;rst Betti number can be computed in terms of a generalized homology theory. A consequence compact irreducible 3-manifold M with nonempty boundary has nonzero #12;rst Betti number, it is natural

Roushon, S. K.

130

VOLUMES OF HYPERBOLIC 3-MANIFOLDS OF BETTI NUMBER AT LEAST 3  

E-Print Network (OSTI)

VOLUMES OF HYPERBOLIC 3-MANIFOLDS OF BETTI NUMBER AT LEAST 3 that the smallest volume hyperbolic 3-manifold has betti number at least 3. In the process, we improve betti number at least 3, then its volume is at least 0.94689 and hence it is not the smallest

Przeworski, Andrew

131

Hamilton-Jacobi Equations on a Manifold and Applications to Grid Generation or Re nement.  

E-Print Network (OSTI)

Hamilton-Jacobi Equations on a Manifold and Applications to Grid Generation or Re#28;nement. Ph Hamilton-Jacobi equations on a manifold, typically on the graph of some previously computed function z method. Keywords: Hamilton-Jacobi equations, viscosity solutions, level set method, adaptative meshes

132

Analytical invariant manifolds near unstable points and the structure of chaos  

E-Print Network (OSTI)

It is known that the asymptotic invariant manifolds around an unstable periodic orbit in conservative systems can be represented by convergent series (Cherry 1926, Moser 1956, 1958, Giorgilli 2001). The unstable and stable manifolds intersect at an infinity of homoclinic points, generating a complicated homoclinic tangle. In the case of simple mappings it was found (Da Silva Ritter et al. 1987) that the domain of convergence of the formal series extends to infinity along the invariant manifolds. This allows in practice to study the homoclinic tangle using only series. However in the case of Hamiltonian systems, or mappings with a finite analyticity domain,the convergence of the series along the asymptotic manifolds is also finite. Here, we provide numerical indications that the convergence does not reach any homoclinic points. We discuss in detail the convergence problem in various cases and we find the degree of approximation of the analytical invariant manifolds to the real (numerical) manifolds as i) the order of truncation of the series increases, and ii) we use higher numerical precision in computing the coefficients of the series. Then we introduce a new method of series composition, by using action-angle variables, that allows the calculation of the asymptotic manifolds up to an a arbitrarily large extent. This is the first case of an analytic development that allows the computation of the invariant manifolds and their intersections in a Hamiltonian system for an extent long enough to allow the study of homoclinic chaos by analytical means.

C. Efthymiopoulos; G. Contopoulos; M. Katsanikas

2014-04-30T23:59:59.000Z

133

Nonlinear dispersion and compact structures  

SciTech Connect

Relaxing the distinguished ordering underlying the derivation of soliton supporting equations leads to new equations endowed with nonlinear dispersion crucial for the formation and coexistence of compactons, solitons with a compact support, and conventional solitons. Vibrations of the anharmonic mass-spring chain lead to a new Boussinesq equation admitting compactons and compact breathers. The model equation [ital u][sub [ital t

Rosenau, P. (Technion, Haifa 32000 (Israel) Center For Nonlinear Studies, MS-B258 Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States))

1994-09-26T23:59:59.000Z

134

Multiple overseas dispersal in amphibians  

Science Journals Connector (OSTI)

...other islands in the western Indian Ocean have been subject to intense...amphibians, which in the western Indian Ocean region are mostly rep...further used as a new calibration point of a molecular clock. We thereby...amphibian overseas dispersal in the Indian Ocean region and the origin...

2003-01-01T23:59:59.000Z

135

5, 1196512030, 2005 Dispersion on  

E-Print Network (OSTI)

ACPD 5, 11965­12030, 2005 Dispersion on complex terrain under winter conditions J. L. Palau et al-resolution mesoscale and Lagrangian particle models J. L. Palau1 , G. P´erez-Landa1 , J. Meli´a2 , D. Segarra2 , and M November 2005 ­ Published: 22 November 2005 Correspondence to: J. L. Palau (jlp@confluencia.biz) © 2005

Paris-Sud XI, Université de

136

Shear dispersion in dense granular flows  

E-Print Network (OSTI)

We formulate and solve a model problem of dispersion of dense granular materials in rapid shear flow down an incline. The effective dispersivity of the depth-averaged concentration of the dispersing powder is shown to vary as the P\\'eclet number squared, as in classical Taylor--Aris dispersion of molecular solutes. An extensions to generic shear profiles is presented, and possible applications to industrial and geological granular flows are noted.

Christov, Ivan C

2014-01-01T23:59:59.000Z

137

Gravitational dispersion in a torsional wave machine  

E-Print Network (OSTI)

We demonstrate that mechanical waves traveling in a torsional, mechanical wave machine exhibit dispersion due to gravity and the discreteness of the medium. We also show that although the dispersion due to discreteness is negligible, the dispersion due to gravity can be easily measured, and can be shown to disappear in a zero-gravity environment.

Rafael de la Madrid; Alejandro Gonzalez; George Irwin

2014-09-01T23:59:59.000Z

138

Milnor-Wood inequalities for manifolds which are locally a product of surfaces  

E-Print Network (OSTI)

The classical Milnor-Wood inequalities for the Euler number of flat oriented vector bundles over surfaces are generalized for higher dimensional closed manifolds that admit a local structure of products of planes. These include products of surfaces as well as closed Hilbert-Blumenthal modular varieties. As a consequence, the Chern Conjecture is confirmed for such manifolds. For manifolds admitting a rigid locally symmetric structure, a complete classification is given for the flat vector bundles with nonzero Euler number. Some of the main results were announced in C.R. Acad. Sci. Paris, Ser. I 346 (2008) 661-666.

Bucher, Michelle

2009-01-01T23:59:59.000Z

139

Variable geometry exhaust manifold turbocharging system for an 8-cylinder marine diesel engine  

Science Journals Connector (OSTI)

The variable geometry exhaust manifold (VGEM) turbocharging system can realize the switch between two charging modes by the switching valve, and it can give a good performance both at the high load operation and ...

Lei Shi; Shaoming Wang; Kangyao Deng; Yi Cui

2012-06-01T23:59:59.000Z

140

Mechanical Systems on an almost Khler model of a Finsler Manifold  

E-Print Network (OSTI)

In this study, we present a new analogue of Euler-Lagrange and Hamilton equations on an almost K\\"ahler model of a Finsler manifold. Also, we give some corollories about the related mechanical systems and equations.

Mehmet Tekkoyun; O?uzhan elik

2012-11-06T23:59:59.000Z

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


141

Quaternionic Bundles and Betti Numbers of Symplectic 4-Manifolds with Kodaira Dimension Zero  

E-Print Network (OSTI)

Symplectic 4-manifolds with Kodaira dimension zero can be viewed as symplectic Calabi-Yau surfaces. We are able to completely determine their Betti numbers by proving two general results on quaternionic vector bundles.

Tian-Jun Li

2006-12-07T23:59:59.000Z

142

Charting a manifold Matthew Brand, MERL (draft revised Oct 2002 to appear NIPS'02)  

E-Print Network (OSTI)

Charting a manifold Matthew Brand, MERL (draft revised Oct 2002 to appear NIPS'02) Abstract We to untie knots, unroll and untwist sheets, and visualize/compress high-dimensional biomechanical and image

Roberts, Stephen

143

"Stable Prime Decompositions of Four-Manifolds" Matthias Kreck, Wolfgang Luck  

E-Print Network (OSTI)

Mi with i = 1(Mi). Stably means that one allows additional connected sums with some copies of S2 ? S2 is oriented diffeomorphic to a connected sum n i=1Mi of oriented manifolds Mi which are prime, i.e. if Mi is diffeomorphic to Mi Mi then Mi or Mi is oriented diffeomorphic to S3 . The manifolds Mi are unique up to order

Teichner, Peter

144

Thermal Ion Dispersion | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Thermal Ion Dispersion Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Thermal Ion Dispersion Details Activities (1) Areas (1) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geochemical Techniques Exploration Sub Group: Geochemical Data Analysis Parent Exploration Technique: Geochemical Data Analysis Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Thermal: Dictionary.png Thermal Ion Dispersion: Thermal Ion Dispersion (TID) is a method used by the precious-metals industry to determine the movement of hot, mineral-bearing waters through rocks, gravels, and soils. The survey involves collection of soil samples

145

PRICE LEVELS AND DISPERSION WITH ASYMMETRIC INFORMATION.  

E-Print Network (OSTI)

??In the extensive literature on price dispersions that exists to date, there is a gap in the analysis of how market structure affects prices as (more)

Bhattacharya, Tanmoy

2011-01-01T23:59:59.000Z

146

Dispersivity as an oil reservoir rock characteristic  

SciTech Connect

The main objective of this research project is to establish dispersivity, {alpha}{sub d}, as an oil reservoir rock characteristic and to use this reservoir rock property to enhance crude oil recovery. A second objective is to compare the dispersion coefficient and the dispersivity of various reservoir rocks with other rock characteristics such as: porosity, permeability, capillary pressure, and relative permeability. The dispersivity of a rock was identified by measuring the physical mixing of two miscible fluids, one displacing the other in a porous medium. 119 refs., 27 figs., 12 tabs.

Menzie, D.E.; Dutta, S.

1989-12-01T23:59:59.000Z

147

Enhanced dispersion in cylindrical packed beds  

Science Journals Connector (OSTI)

...method dispersivity geometry ground water heterogeneity hydrodynamics numerical models pollution pore water porosity remediation simulation tracers 2001 07...processes including groundwater remediation, secondary oil recovery...

2002-01-01T23:59:59.000Z

148

Dispersion compensation for attosecond electron pulses  

SciTech Connect

We propose a device to compensate for the dispersion of attosecond electron pulses. The device uses only static electric and magnetic fields and therefore does not require synchronization to the pulsed electron source. Analogous to the well-known optical dispersion compensator, an electron dispersion compensator separates paths by energy in space. Magnetic fields are used as the dispersing element, while a Wien filter is used for compensation of the electron arrival times. We analyze a device with a size of centimeters, which can be applied to ultrafast electron diffraction and microscopy, and fundamental studies.

Hansen, Peter; Baumgarten, Cory; Batelaan, Herman; Centurion, Martin [Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588 (United States)

2012-08-20T23:59:59.000Z

149

Quantifying The Complexity Of Geodesic Paths On Curved Statistical Manifolds Through Information Geometric Entropies and Jacobi Fields  

E-Print Network (OSTI)

We characterize the complexity of geodesic paths on a curved statistical manifold M_{s} through the asymptotic computation of the information geometric complexity V_{M_{s}} and the Jacobi vector field intensity J_{M_{s}}. The manifold M_{s} is a 2l-dimensional Gaussian model reproduced by an appropriate embedding in a larger 4l-dimensional Gaussian manifold and endowed with a Fisher-Rao information metric g_{{\\mu}{\

Carlo Cafaro; Stefano Mancini

2010-11-25T23:59:59.000Z

150

Dissociations of the Medial and Lateral Perforant Path Projections Into Dorsal DG, CA3, and CA1 for Spatial and Nonspatial (Visual Object)  

E-Print Network (OSTI)

-amino-5-phosphonovaleric acid (APV) infusions, whereas lateral perforant path plasticity can be attenuated by naloxone infusions. The present experiment was designed to evaluate the role of each entorhinal) changes in the overall configuration of environmental stimuli. Dorsal dentate gyrus infusions of either

Wagner, Anthony

151

A review of dispersion modelling and its application to the dispersion of particles: An overview of different dispersion models available  

Science Journals Connector (OSTI)

This paper provides the first review of the application of atmospheric models for particle dispersion. The different types of dispersion models available, from simple box type models to complex fluid dynamics models are outlined and the suitability of the different approaches to dispersion modelling within different environments, in regards to scale, complexity of the environment and concentration parameters is assessed. Finally, several major commercial and non-commercial particle dispersion packages are reviewed, detailing which processes are included and advantages and limitations of their use to modelling particle dispersion. The models reviewed included: Box models (AURORA, CPB and PBM), Gaussian models (CALINE4, HIWAY2, CAR-FMI, OSPM, CALPUFF, AEROPOL, AERMOD, UK-ADMS and SCREEN3), Lagrangian/Eulerian Models (GRAL, TAPM, ARIA Regional), CFD models (ARIA Local, MISKAM, MICRO-CALGRID) and models which include aerosol dynamics (GATOR, MONO32, UHMA, CIT, AERO, RPM, AEROFOR2, URM-1ATM, MADRID, CALGRID and UNI-AERO).

N.S. Holmes; L. Morawska

2006-01-01T23:59:59.000Z

152

Coherent quantum dynamics in steady-state manifolds of strongly dissipative systems  

E-Print Network (OSTI)

It has been recently realized that dissipative processes can be harnessed and exploited to the end of coherent quantum control and information processing. In this spirit we consider strongly dissipative quantum systems admitting a non-trivial manifold of steady states. We show how one can enact adiabatic coherent unitary manipulations e.g., quantum logical gates, inside this steady-state manifold by adding a weak, time-rescaled, Hamiltonian term into the system's Liouvillian. The effective long-time dynamics is governed by a Fermi golden rule type Hamiltonian which results from the interplay between the weak unitary control and the fast relaxation process. The leakage outside the steady-state manifold entailed by the Hamiltonian term is suppressed by an environment-induced symmetrization of the dynamics. We present applications to quantum-computation in decoherence-free subspaces and noiseless subsystems and numerical analysis of non-adiabatic errors.

Paolo Zanardi; Lorenzo Campos Venuti

2014-04-18T23:59:59.000Z

153

The abstract boundary---a new approach to singularities of manifolds  

E-Print Network (OSTI)

A new scheme is proposed for dealing with the problem of singularities in General Relativity. The proposal is, however, much more general than this. It can be used to deal with manifolds of any dimension which are endowed with nothing more than an affine connection, and requires a family \\calc\\ of curves satisfying a {\\em bounded parameter property} to be specified at the outset. All affinely parametrised geodesics are usually included in this family, but different choices of family \\calc\\ will in general lead to different singularity structures. Our key notion is the {\\em abstract boundary\\/} or {\\em $a$-boundary\\/} of a manifold, which is defined for any manifold \\calm\\ and is independent of both the affine connection and the chosen family \\calc\\ of curves. The $a$-boundary is made up of equivalence classes of boundary points of \\calm\\ in all possible open embeddings. It is shown that for a pseudo-Riemannian manifold $(\\calm,g)$ with a specified family \\calc\\ of curves, the abstract boundary points can then be split up into four main categories---regular, points at infinity, unapproachable points and singularities. Precise definitions are also provided for the notions of a {\\em removable singularity} and a {\\em directional singularity}. The pseudo-Riemannian manifold will be said to be singularity-free if its abstract boundary contains no singularities. The scheme passes a number of tests required of any theory of singularities. For instance, it is shown that all compact manifolds are singularity-free, irrespective of the metric and chosen family \\calc.

Susan M. Scott; Peter Szekeres

1994-05-26T23:59:59.000Z

154

Dictionary learning on the manifold of square root densities and application to reconstruction of diffusion propagator fields  

Science Journals Connector (OSTI)

In this paper, we present a novel dictionary learning framework for data lying on the manifold of square root densities and apply it to the reconstruction of diffusion propagator (DP) fields given a multi-shell diffusion MRI data set. Unlike most of ... Keywords: DW-MRI, dictionary learning, diffusion propagator reconstruction, manifold

Jiaqi Sun; Yuchen Xie; Wenxing Ye; Jeffrey Ho; Alireza Entezari; Stephen J. Blackband; Baba C. Vemuri

2013-06-01T23:59:59.000Z

155

Manifold modeling for brain population analysis Samuel Gerber *, Tolga Tasdizen, P. Thomas Fletcher, Sarang Joshi, Ross Whitaker, and the Alzheimers  

E-Print Network (OSTI)

Manifold modeling for brain population analysis Samuel Gerber *, Tolga Tasdizen, P. Thomas Fletcher Brain MRI Manifold learning Computer aided clinical diagnosis a b s t r a c t This paper describes a method for building efficient representations of large sets of brain images. Our hypothesis

Utah, University of

156

Reversible chemisorption on highly dispersed Ru catalysts  

SciTech Connect

Hydrogen and carbon monoxide adsorptions have been studied by static gas volumetric measurement on a range of highly dispersed Y-zeolite-supported ruthenium catalysts prepared by ion exchange. At ambient temperature, the absorption isotherms indicated two distinct types of adsorption - reversible (composed of both physisorption and weak chemisorption) and irreversible (strongly chemisorbed). The catalysts were highly dispersed and had average particle diameters ranging from 0.9 to 1.6 nm. Reversible hydrogen chemisorption was found to be a function of average particle diameter and dispersion. On the other hand, reversible carbon monoxide chemisorption seemed to be mainly due to interaction with the support.

Yang, C.H.; Goodwin, J.G. Jr.

1982-11-01T23:59:59.000Z

157

Definition: Thermal Ion Dispersion | Open Energy Information  

Open Energy Info (EERE)

Dispersion Dispersion Jump to: navigation, search Dictionary.png Thermal Ion Dispersion Thermal Ion Dispersion (TID) is a method used by the precious-metals industry to determine the movement of hot, mineral-bearing waters through rocks, gravels, and soils. The survey involves collection of soil samples and analyses of ions by an enzyme leach process done by commercial laboratories. The method utilizes the property of elements to be dissolved, transported, or deposited depending on the temperature of the thermal waters.{{#tag:ref|[[Final Technical Report}}[1][2][3][4] Also Known As enzyme leach References ↑ Geothermal Resource Evaluation And Definitioni (Gred) Program-Phases I ↑ Ii ↑ And Iii For The Animas Valley ↑ Nm Geothermal Resource]] {{#set:Reference URI={{#explode:{{#replace:[[Final Technical Report|[|}}|

158

Dispersed Project Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Dispersed Project Wind Farm Dispersed Project Wind Farm Jump to: navigation, search Name Dispersed Project Wind Farm Facility Dispersed Project Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Developer Northern Alternative Energy Energy Purchaser Xcel Energy Location Lincoln County MN Coordinates 44.4039°, -96.2646° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":44.4039,"lon":-96.2646,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

159

The High Shear Rheological Properties of Dispersions  

Science Journals Connector (OSTI)

Extremely high shear rates are applied to pigment dispersions during various scale-up and manufactring processes in several industries. As reported in ... responsible for failures in coating processes. Several additives

V. Ribitsch; J. Pfragner

1995-01-01T23:59:59.000Z

160

Polariton dispersion of periodic quantum well structures  

Science Journals Connector (OSTI)

We studied the polariton dispersion relations of a periodic quantum-well structure with a period in the vicinity of half the exciton resonance wavelength, i.e., the Bragg structure. We classified polariton mod...

A. V. Mintsev; L. V. Butov; C. Ell; S. Mosor

2002-11-01T23:59:59.000Z

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


161

Transport and Dispersion in Complex Terrain  

Science Journals Connector (OSTI)

......recently along the mountain-plains interface near DOE's Rocky Flats Plant in Colorado. ASCOT meteorological experiments in January and February 1991 were coordinated with Rocky Flats tracer releases for airflow and dispersion model evaluations......

C.E. Elderkin; P.H. Gudiksen

1993-12-01T23:59:59.000Z

162

Energy Dispersion in African Easterly Waves  

Science Journals Connector (OSTI)

The existence of an upstream (eastward) group velocity for African easterly waves (AEWs) is shown based on single-point lag regressions using gridded reanalysis data from 1990 to 2010. The eastward energy dispersion is consistent with the ...

Michael Diaz; Anantha Aiyyer

2013-01-01T23:59:59.000Z

163

Invariant Manifolds for the Station Keeping of Solar Sails Ariadna Farres, AJ  

E-Print Network (OSTI)

Invariant Manifolds for the Station Keeping of Solar Sails Ariadna Farr´es, AJ Universitat de 2 / 45 inria-00585612,version1-14Apr2011 #12;Background What is a Solar Sail ? Solar Sails are a new concept of spacecraft propulsion that takes ad- vantage of the Solar radiation pressure to propel

Boyer, Edmond

164

SHORT GEODESIC SEGMENTS BETWEEN TWO POINTS ON A CLOSED RIEMANNIAN MANIFOLD  

E-Print Network (OSTI)

SHORT GEODESIC SEGMENTS BETWEEN TWO POINTS ON A CLOSED RIEMANNIAN MANIFOLD Alexander Nabutovsky there exist at least k distinct geodesics of length at most 20k!d between these points for every positive that for any pair of points on a closed Riemannian man- ifold Mn there exist infinitely many geodesics

Nabutovsky, Alexander

165

Multi-robot Coverage and Exploration on Riemannian Manifolds with Boundary  

E-Print Network (OSTI)

Multi-robot Coverage and Exploration on Riemannian Manifolds with Boundary Subhrajit Bhattacharya Robert Ghrist Vijay Kumar Abstract Multi-robot coverage and exploration are fundamental problems in robotics. A widely-used, efficient and distributable algorithm for achieving coverage of a convex

Ghrist, Robert W.

166

Integral manifolding structure for fuel cell core having parallel gas flow  

DOE Patents (OSTI)

Disclosed herein are manifolding means for directing the fuel and oxidant gases to parallel flow passageways in a fuel cell core. Each core passageway is defined by electrolyte and interconnect walls. Each electrolyte and interconnect wall consists respectively of anode and cathode materials layered on the opposite sides of electrolyte material, or on the opposite sides of interconnect material. A core wall projects beyond the open ends of the defined core passageways and is disposed approximately midway between and parallel to the adjacent overlaying and underlying interconnect walls to define manifold chambers therebetween on opposite sides of the wall. Each electrolyte wall defining the flow passageways is shaped to blend into and be connected to this wall in order to redirect the corresponding fuel and oxidant passageways to the respective manifold chambers either above or below this intermediate wall. Inlet and outlet connections are made to these separate manifold chambers respectively, for carrying the fuel and oxidant gases to the core, and for carrying their reaction products away from the core.

Herceg, Joseph E. (Naperville, IL)

1984-01-01T23:59:59.000Z

167

Integral manifolding structure for fuel cell core having parallel gas flow  

DOE Patents (OSTI)

Disclosed herein are manifolding means for directing the fuel and oxidant gases to parallel flow passageways in a fuel cell core. Each core passageway is defined by electrolyte and interconnect walls. Each electrolyte and interconnect wall consists respectively of anode and cathode materials layered on the opposite sides of electrolyte material, or on the opposite sides of interconnect material. A core wall projects beyond the open ends of the defined core passageways and is disposed approximately midway between and parallel to the adjacent overlaying and underlying interconnect walls to define manifold chambers therebetween on opposite sides of the wall. Each electrolyte wall defining the flow passageways is shaped to blend into and be connected to this wall in order to redirect the corresponding fuel and oxidant passageways to the respective manifold chambers either above or below this intermediate wall. Inlet and outlet connections are made to these separate manifold chambers respectively, for carrying the fuel and oxidant gases to the core, and for carrying their reaction products away from the core.

Herceg, J.E.

1983-10-12T23:59:59.000Z

168

"Stable Prime Decompositions of Four-Manifolds" Matthias Kreck, Wolfgang Luck  

E-Print Network (OSTI)

Mi with i = 1(Mi). Stably means that one allows additional connected sums with some copies of S2 ? S2 de- composition. Namely, M is oriented diffeomorphic to a connected sum n i=1Mi of oriented manifolds Mi which are prime, i.e. if Mi is diffeomorphic to Mi Mi , then Mi or Mi is oriented diffeomorphic

Lück, Wolfgang

169

Motion Tasks and Force Control for Robot Manipulators on Embedded 2-D Manifolds  

E-Print Network (OSTI)

a challenging problem of the robotics field with many appli- cations including robotic surface painting, surfaceMotion Tasks and Force Control for Robot Manipulators on Embedded 2-D Manifolds Xanthi Papageorgiou the end effector of a robotic manipulator across the surface of an object in the workspace

Loizou, Savvas G.

170

Motion Tasks for Robot Manipulators on Embedded 2-D Manifolds under Input Constraints  

E-Print Network (OSTI)

a task along a particular surface, such as robotic surface painting, surface cleaning, and surfaceMotion Tasks for Robot Manipulators on Embedded 2-D Manifolds under Input Constraints Xanthi the end effector of a robotic manipulator, which is constrained in terms of joint rates, on the surface

Tanner, Herbert G.

171

Manifold-based starting point generation and its application to distillation  

E-Print Network (OSTI)

Manifold-based starting point generation and its application to distillation Ali Baharev*, Ferenc-states in homogeneous azeotropic distillation . . . . . . . . . . 11 5.2 Multiple steady-states in ideal two-product distillation . . . . . . . . . . . . . . 11 6 Conclusion 13 A Ordering sparse matrices 14 A.1 Ordering to block

Neumaier, Arnold

172

Symmetry operators for Dirac's equation on two-dimensional spin manifolds  

E-Print Network (OSTI)

It is shown that the second order symmetry operators for the Dirac equation on a general two-dimensional spin manifold may be expressed in terms of Killing vectors and valence two Killing tensors. The role of these operators in the theory of separation of variables for the Dirac equation is studied.

Lorenzo Fatibene; Raymond G. McLenaghan; Giovanni Rastelli; Shane N. Smith

2008-12-11T23:59:59.000Z

173

A NOTE ON THE GROWTH OF BETTI NUMBERS AND RANKS OF 3-MANIFOLD GROUPS  

E-Print Network (OSTI)

A NOTE ON THE GROWTH OF BETTI NUMBERS AND RANKS OF 3-MANIFOLD GROUPS STEFAN FRIEDL Abstract. Let N with `fast' growth of Betti numbers as well as a cofinal filtration of 1(N) with `slow' growth of ranks. 1 it is of interest to study how the following measures of `complexity' grow: (1) the first Betti number b1(i) = dim H

Friedl, Stefan

174

ESTIMATION OF EXHAUST MANIFOLD PRESSURE IN TURBOCHARGED GASOLINE ENGINES WITH VARIABLE VALVE TIMING  

E-Print Network (OSTI)

ESTIMATION OF EXHAUST MANIFOLD PRESSURE IN TURBOCHARGED GASOLINE ENGINES WITH VARIABLE VALVE TIMING in turbocharged gasoline engines with variable valve timing requires knowledge of exhaust mani- fold pressure, Pe control systems for gasoline engines rely heavily on feedforward air-fuel ratio (A/F) control to meet

Grizzle, Jessy W.

175

A landscape of non-supersymmetric AdS vacua on coset manifolds  

E-Print Network (OSTI)

We construct new families of non-supersymmetric sourceless type IIA AdS4 vacua on those coset manifolds that also admit supersymmetric solutions. We investigate the spectrum of left-invariant modes and find that most, but not all, of the vacua are stable under these fluctuations. Generically, there are also no massless moduli.

Paul Koerber; Simon Kors

2010-05-10T23:59:59.000Z

176

HEAT KERNEL ON A NON-COMPACT RIEMANNIAN MANIFOLD Alexander Grigor'yan  

E-Print Network (OSTI)

HEAT KERNEL ON A NON-COMPACT RIEMANNIAN MANIFOLD Alexander Grigor'yan Dedicated to E.M.Landis 0. Introduction This paper is a survey of some recent results on the heat kernel of a non-compact complete of properties of the heat kernel in different contexts. In the present paper, we are mainly concerned with a new

Grigor'yan, Alexander

177

Role of polymeric dispersant functional groups in the dispersion behaviour of titania pigment particles  

Science Journals Connector (OSTI)

The adsorption of polymeric dispersants onto titania pigment particles has been investigated ... the type of polymer functional group, using polyacrylic acid and modified polyacrylamides. The polyacrylamides incl...

S. Farrokhpay; G. Morris; D. Fornasiero; P. Self

2004-01-01T23:59:59.000Z

178

Dispersion Tolerance Enhancement in Electronic Dispersion Compensation Using Full Optical-Field Reconstruction  

Science Journals Connector (OSTI)

We experimentally verify the feasibility of receiver-side electronic dispersion compensation using optical-field reconstruction, and theoretically increase the fundamental limit of...

Zhao, Jian; McCarthy, Mary E; Gunning, Paul; Ellis, Andrew D

179

Non-streaming high-efficiency perforated semiconductor neutron detectors, methods of making same and measuring wand and detector modules utilizing same  

DOE Patents (OSTI)

Non-streaming high-efficiency perforated semiconductor neutron detectors, method of making same and measuring wands and detector modules utilizing same are disclosed. The detectors have improved mechanical structure, flattened angular detector responses, and reduced leakage current. A plurality of such detectors can be assembled into imaging arrays, and can be used for neutron radiography, remote neutron sensing, cold neutron imaging, SNM monitoring, and various other applications.

McGregor, Douglas S. (Riley, KS); Shultis, John K. (Manhattan, KS); Rice, Blake B. (Manhattan, KS); McNeil, Walter J. (Winnfield, KS); Solomon, Clell J. (Wichita, KS); Patterson, Eric L. (Manhattan, KS); Bellinger, Steven L. (Manhattan, KS)

2010-12-21T23:59:59.000Z

180

Quantifying seed dispersal kernels from truncated seed-tracking data  

E-Print Network (OSTI)

have lower survival than those that disperse further away from conspecifics (Janzen 1970; Comita et al

Bermingham, Eldredge

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


181

Instability of nonlinear dispersive solitary waves  

Science Journals Connector (OSTI)

We consider linear instability of solitary waves of several classes of dispersive long wave models. They include generalizations of KDV, BBM, regularized Boussinesq equations, with general dispersive operators and nonlinear terms. We obtain criteria for the existence of exponentially growing solutions to the linearized problem. The novelty is that we dealt with models with nonlocal dispersive terms, for which the spectra problem is out of reach by the Evans function technique. For the proof, we reduce the linearized problem to study a family of nonlocal operators, which are closely related to properties of solitary waves. A continuation argument with a moving kernel formula is used to find the instability criteria. These techniques have also been extended to study instability of periodic waves and of the full water wave problem.

Zhiwu Lin

2008-01-01T23:59:59.000Z

182

Instability of nonlinear dispersive solitary waves  

E-Print Network (OSTI)

We consider linear instability of solitary waves of several classes of dispersive long wave models. They include generalizations of KDV, BBM, regularized Boussinesq equations, with general dispersive operators and nonlinear terms. We obtain criteria for the existence of exponentially growing solutions to the linearized problem. The novelty is that we dealt with models with nonlocal dispersive terms, for which the spectra problem is out of reach by the Evans function technique. For the proof, we reduce the linearized problem to study a family of nonlocal operators, which are closely related to properties of solitary waves. A continuation argument with a moving kernel formula are used to find the instability criteria. Recently, these techniques have also been extended to study instability of periodic waves and to the full water wave problem.

Lin, Zhiwu

2008-01-01T23:59:59.000Z

183

Ceramics containing dispersants for improved fracture toughness  

DOE Patents (OSTI)

The invention is a ceramic composition containing a new class of dispersant for hindering crack propagation by means of one or more energy-dissipative mechanisms. The composition is composed of a ceramic matrix with dispersed particles of a transformation-prone rare-earth niobate, tantalate or mixtures of these with each other and/or with a rare-earth vanadate. The dispersants, having a generic composition tRMO.sub.4, where R is a rare-earth element, B is Nb or Ta and O is oxygen, are mixed in powder form with a powder of the matrix ceramic and sintered to produce a ceramic form or body. The crack-hindering mechanisms operates to provide improved performance over a wide range of temperature and operating conditions.

Nevitt, Michael V. (Wheaton, IL); Aldred, Anthony T. (Wheaton, IL); Chan, Sai-Kit (Darien, IL)

1987-01-01T23:59:59.000Z

184

Casimir energy, dispersion, and the Lifshitz formula  

SciTech Connect

Despite suggestions to the contrary, we show in this paper that the usual dispersive form of the electromagnetic energy density must be used to derive the Lifshitz force between parallel dielectric media. This conclusion follows from the general form of the quantum vacuum energy, which is the basis of the multiple-scattering formalism. As an illustration, we explicitly derive the Lifshitz formula for the interaction between parallel dielectric semispaces, including dispersion, starting from the expression for the total energy of the system. The issues of constancy of the energy between parallel plates and of the observability of electrostrictive forces are briefly addressed.

Milton, Kimball A.; Wagner, Jef; Parashar, Prachi; Brevik, Iver [Oklahoma Center for High Energy Physics and Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019-2061 (United States); Department of Energy and Process Engineering, Norwegian University of Science and Technology, N-7491 Trondheim (Norway)

2010-03-15T23:59:59.000Z

185

Nonlinear time-fractional dispersive equations  

E-Print Network (OSTI)

In this paper we study some cases of time-fractional nonlinear dispersive equations (NDEs) involving Caputo derivatives, by means of the invariant subspace method. This method allows to find exact solutions to nonlinear time-fractional partial differential equations by separating variables. We first consider a third order time-fractional NDE that admits a four-dimensional invariant subspace and we find a similarity solution. We also study a fifth order NDE. In this last case we find a solution involving Mittag-Leffler functions. We finally observe that the invariant subspace method permits to find explicit solutions for a wide class of nonlinear dispersive time-fractional equations.

P. Artale Harris; R. Garra

2014-10-29T23:59:59.000Z

186

Method of dispersing particulate aerosol tracer  

DOE Patents (OSTI)

A particulate aerosol tracer which comprises a particulate carrier of sheet silicate composition having a particle size up to one micron, and a cationic dopant chemically absorbed in solid solution in the carrier. The carrier is preferably selected from the group consisting of natural mineral clays such as bentonite, and the dopant is selected from the group consisting of rare earth elements and transition elements. The tracers are dispersed by forming an aqueous salt solution with the dopant present as cations, dispersing the carriers in the solution, and then atomizing the solution under heat sufficient to superheat the solution droplets at a level sufficient to prevent reagglomeration of the carrier particles.

O'Holleran, Thomas P. (Belleville, MI)

1988-01-01T23:59:59.000Z

187

Effects of dispersants and soluble counter-ions on aqueous dispersibility of nano-sized zirconia powder  

Science Journals Connector (OSTI)

The effect of different dispersants and water leaching on aqueous dispersibility of zirconia powder was studied. Zeta potentials of aqueous solutions containing nano-sized zirconia powder and different dispersants, such as ammonium polyacrylic acid (PAA-NH4) and tetramethyl ammonium hydroxide (TMAH) and water leaching were characterized. Better dispersion of nano-sized zirconia powder in aqueous solutions was achieved with the addition of dispersant and water leaching.

Zhipeng Xie; Jingtao Ma; Qing Xu; Yong Huang; Yi-Bing Cheng

2004-01-01T23:59:59.000Z

188

A method to extend flamelet manifolds for prediction of NOx and long time scale species with tabulated chemistry  

Science Journals Connector (OSTI)

Numerical simulation is currently used to help design low NOx devices for aircraft engines. In order to improve the prediction of pollutant species, combustion models based on tabulated chemistry have been commonly used in recent years. However, the short time scales of usual flamelet manifolds can lead to errors concerning the NO prediction in post flame area, as shown in this paper. Thus, a new method is proposed to extend the manifold in order to describe the evolution of species with a long characteristic time. This method is tested in the framework of 0D-1D computations. The use of the extended manifold is shown to be necessary to correctly predict the evolution of NO concentration in burnt gases. As an example, the extended and classical manifolds were compared in the framework of 2D simulations of an industrial-like combustor, showing an evident difference on the NO levels predicted in the outlet section.

Aymeric Boucher; Nicolas Bertier; Francis Dupoirieux

2014-01-01T23:59:59.000Z

189

On the counting function of the embedded eigenvalues for some manifold with cusps, and magnetic Laplacian  

E-Print Network (OSTI)

We consider a non compact, complete manifold {\\bf{M}} of finite area with cuspidal ends. The generic cusp is isomorphic to ${\\bf{X}}\\times ]1,+\\infty [$ with metric $ds^2=(h+dy^2)/y^{2\\delta}.$ {\\bf{X}} is a compact manifold with nonzero first Betti number equipped with the metric $h.$ For a one-form $A$ on {\\bf{M}} such that in each cusp $A$ is a non exact one-form on the boundary at infinity, we prove that the magnetic Laplacian $-\\Delta_A=(id+A)^\\star (id+A)$ satisfies the Weyl asymptotic formula with sharp remainder. We deduce an upper bound for the counting function of the embedded eigenvalues of the Laplace-Beltrami operator $-\\Delta =-\\Delta_0 .$

Morame, Abderemane

2011-01-01T23:59:59.000Z

190

Counting function of the embedded eigenvalues for some manifold with cusps, and magnetic Laplacian  

E-Print Network (OSTI)

We consider a non compact, complete manifold {\\bf{M}} of finite area with cuspidal ends. The generic cusp is isomorphic to ${\\bf{X}}\\times ]1,+\\infty [$ with metric $ds^2=(h+dy^2)/y^{2\\delta}.$ {\\bf{X}} is a compact manifold with nonzero first Betti number equipped with the metric $h.$ For a one-form $A$ on {\\bf{M}} such that in each cusp $A$ is a non exact one-form on the boundary at infinity, we prove that the magnetic Laplacian $-\\Delta_A=(id+A)^\\star (id+A)$ satisfies the Weyl asymptotic formula with sharp remainder. We deduce an upper bound for the counting function of the embedded eigenvalues of the Laplace-Beltrami operator $-\\Delta =-\\Delta_0.$

Abderemane Morame; Francoise Truc

2011-09-09T23:59:59.000Z

191

The Construction of Spinor Fields on Manifolds with Smooth Degenerate Metrics  

E-Print Network (OSTI)

We examine some of the subtleties inherent in formulating a theory of spinors on a manifold with a smooth degenerate metric. We concentrate on the case where the metric is singular on a hypersurface that partitions the manifold into Lorentzian and Euclidean domains. We introduce the notion of a complex spinor fibration to make precise the meaning of continuity of a spinor field and give an expression for the components of a local spinor connection that is valid in the absence of a frame of local orthonormal vectors. These considerations enable one to construct a Dirac equation for the discussion of the behavior of spinors in the vicinity of the metric degeneracy. We conclude that the theory contains more freedom than the spacetime Dirac theory and we discuss some of the implications of this for the continuity of conserved currents.

J Schray; T Dray; C A Manogue; R W Tucker; C Wang

1996-05-17T23:59:59.000Z

192

Bose-Einstein Condensation on a Manifold with Nonnegative Ricci Curvature  

E-Print Network (OSTI)

The Bose-Einstein condensation for an ideal Bose gas and for a dilute weakly interacting Bose gas in a manifold with nonnegative Ricci curvature is investigated using the heat kernel and eigenvalue estimates of the Laplace operator. The main focus is on the nonrelativistic gas. However, special relativistic ideal gas is also discussed. The thermodynamic limit of the heat kernel and eigenvalue estimates is taken and the results are used to derive bounds for the depletion coefficient. In the case of a weakly interacting gas Bogoliubov approximation is employed. The ground state is analyzed using heat kernel methods and finite size effects on the ground state energy are proposed. The justification of the c-number substitution on a manifold is given.

Levent Akant; Emine Ertugrul; Ferzan Tapramaz; O. Teoman Turgut

2014-03-28T23:59:59.000Z

193

Study of Pollutant Dispersion in Urban Environments  

E-Print Network (OSTI)

power plant using coal releases great amounts of harmful gases to produce the electric energy head: Study of pollutant dispersion in urban environments #12;Abstract Computational simulations can mechanics with the use of computer models and simulations. In this study the simulations of the complex

Allen, Gabrielle

194

A GIS-based atmospheric dispersion model  

E-Print Network (OSTI)

pollution due to the use of agricultural pesticide is a major concern to- day, regarding both public health dispersion and to propose an useful air pollution prediction tool, using fluid mechanics equations and open un outil de prediction de la pollution de l'air . Ce travail concerne la modélisation de la dérive

Boyer, Edmond

195

Localized overlap algorithm for unexpanded dispersion energies  

SciTech Connect

First-principles-based, linearly scaling algorithm has been developed for calculations of dispersion energies from frequency-dependent density susceptibility (FDDS) functions with account of charge-overlap effects. The transition densities in FDDSs are fitted by a set of auxiliary atom-centered functions. The terms in the dispersion energy expression involving products of such functions are computed using either the unexpanded (exact) formula or from inexpensive asymptotic expansions, depending on the location of these functions relative to the dimer configuration. This approach leads to significant savings of computational resources. In particular, for a dimer consisting of two elongated monomers with 81 atoms each in a head-to-head configuration, the most favorable case for our algorithm, a 43-fold speedup has been achieved while the approximate dispersion energy differs by less than 1% from that computed using the standard unexpanded approach. In contrast, the dispersion energy computed from the distributed asymptotic expansion differs by dozens of percent in the van der Waals minimum region. A further increase of the size of each monomer would result in only small increased costs since all the additional terms would be computed from the asymptotic expansion.

Rob, Fazle; Szalewicz, Krzysztof [Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)] [Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States); Misquitta, Alston J. [School of Physics and Astronomy, Queen Mary, University of London, London E1 4NS (United Kingdom)] [School of Physics and Astronomy, Queen Mary, University of London, London E1 4NS (United Kingdom); Podeszwa, Rafa? [Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice (Poland)] [Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice (Poland)

2014-03-21T23:59:59.000Z

196

8, 67936824, 2008 dispersion rates in  

E-Print Network (OSTI)

patterns, it is shown that initial buoyancy fluxes at ship stack have minor effect on plume dilution rate modeling and measurement (remote or "in-situ") studies of ship exhaust25 effects must dealACPD 8, 6793­6824, 2008 Ship plume dispersion rates in convective BL F. Chosson et al. Title Page

Paris-Sud XI, Université de

197

Dispersal Pathways for Particle-Associated Pollutants  

Science Journals Connector (OSTI)

...sediments in the bight apex revealed that...muddy Christiaensen Basin, adjacent to the...for the New York Bight apex, Hudson-Raritan...ing Christiaensen Basin (12 percent by weight...0. May 1974 Aug Bight apex as highly dispersive...the Christiaensen Basin and the Hudson Shelf...

Robert A. Young; Donald J. P. Swift; Thomas L. Clarke; George R. Harvey; Peter R. Betzer

1985-08-02T23:59:59.000Z

198

Phonon dispersion of graphite J. Maultzsch  

E-Print Network (OSTI)

the acoustic branches below 400 cm-1 were measured by inelastic neutron scattering [1]. The optical phonons. The phonon dispersion of graphite was determined by inelastic X-ray scattering along the -K, K-M, and -K. This coupling dominates the scattering mechanism in both electronic transport and Raman scattering. Many

Nabben, Reinhard

199

Dispersing brush mice prefer habitat like home  

Science Journals Connector (OSTI)

...Dispersing brush mice prefer habitat like home Karen E Mabry * Judy A Stamps * Author...habitat similar to that at our study site, home ranges were 0.11-0.15ha, and no between-sex difference in adult home range size was detected (Kalcounis-Ruppell...

2008-01-01T23:59:59.000Z

200

Particle dispersion by random waves in the rotating Boussinesq system  

E-Print Network (OSTI)

We present a theoretical and numerical study of horizontal particle dispersion due to random waves in the three-dimensional rotating and stratified Boussinesq system, which serves as a simple model to study the dispersion ...

Ferrari, Raffaele

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


201

Viscosity model of high-viscosity dispersing system  

Science Journals Connector (OSTI)

High-viscosity dispersing system is formed by dispersing the solid particles in the high-viscosity continuous medium. It is very easy to ... the rheology behavior becomes complicated. The apparent viscosity of th...

Xian-fu Wei ???; Na Wang ??

2008-09-01T23:59:59.000Z

202

Update 1 to: A Dispersion Modeling Analysis of Downwash from...  

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

Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions in a Cycling Mode Update 1 to: A Dispersion Modeling...

203

Thermal boundary layer development in dispersed flow film boiling  

E-Print Network (OSTI)

Dispersed flow film boiling consists of a dispersion of droplets which are carried over a very hot surface by their vapor. This process occurs in cryogenic equipment and wet steam turbines. It is also of interest in the ...

Hull, Lawrence M.

1982-01-01T23:59:59.000Z

204

Dispersion modeling of ground-level area sources of particulate  

E-Print Network (OSTI)

The use of dispersion modeling by State Air Pollution hics. Regulatory Agencies (SAPRAS) is increasing. Dispersion modeling provides a quick and efficient means of determining the downwind impact of pollutant release from a source. The SAPRAS...

Fritz, Bradley Keith

2012-06-07T23:59:59.000Z

205

Geographic dispersion in teams : its history, experience, measurement, and change  

E-Print Network (OSTI)

This thesis begins with the simple argument that geographic dispersion has gone surprisingly unexamined despite its role as the domain-defining construct for geographically dispersed teams (a.k.a. "virtual teams"). The ...

O'Leary, Michael Boyer, 1969-

2002-01-01T23:59:59.000Z

206

Paper Number -1-Simulation model of dispersions in turning process  

E-Print Network (OSTI)

Paper Number -1- Simulation model of dispersions in turning process Wolff Valery 1, Lefebvre Arnaud. In this paper, an extent of the simulation model of dispersions in turning process first exposed in [W1

Paris-Sud XI, Université de

207

Dispersion-free radial transmission lines  

DOE Patents (OSTI)

A dispersion-free radial transmission line ("DFRTL") preferably for linear accelerators, having two plane conductors each with a central hole, and an electromagnetically permeable material ("EPM") between the two conductors and surrounding a channel connecting the two holes. At least one of the material parameters of relative magnetic permeability, relative dielectric permittivity, and axial width of the EPM is varied as a function of radius, so that the characteristic impedance of the DFRTL is held substantially constant, and pulse transmission therethrough is substantially dispersion-free. Preferably, the EPM is divided into concentric radial sections, with the varied material parameters held constant in each respective section but stepwise varied between sections as a step function of the radius. The radial widths of the concentric sections are selected so that pulse traversal time across each section is the same, and the varied material parameters of the concentric sections are selected to minimize traversal error.

Caporaso, George J. (Livermore, CA); Nelson, Scott D. (Patterson, CA)

2011-04-12T23:59:59.000Z

208

HIGHLY DISPERSED ALLOY CATHODE CATALYST FOR DURABILITY  

E-Print Network (OSTI)

Understanding high performance materials Pt/C cathode B.S.E. Pt PtCo/C cathode IrB.S.E. Pt Co PtIrCo/C cathodeHIGHLY DISPERSED ALLOY CATHODE CATALYST FOR DURABILITY T. D. Jarvi UTC Power Corporation Electrochemical Area Loss Activity at 900 mVRHE (IR-Free) 0.44 A/mg Pt Specific Activity at 900 m

209

Dispersion relation for magnetosonic waves within the upper atmospheric plasma  

Science Journals Connector (OSTI)

The dispersion relation for magnetosonic waves within the upper atmospheric plasma has been derived. The result can be...

S. S. De; Bithika Ghosh; Manasi Mal; B. Ghosh

1990-01-01T23:59:59.000Z

210

Human-mediated dispersal of seeds over long distances  

Science Journals Connector (OSTI)

...38 Bo: 1.55 power exponential...the mechanistic wind dispersal model...3.90.11 plant height (m) B...dispersal kernel for wind dispersal and...Average vertical winds (table 2, scenario...and the fitted power-exponential...scenarios: (a,b) plant growing next to...

2009-01-01T23:59:59.000Z

211

Biogenic Hydroxylated Carboxylate Monomers Serve as Dispersants for  

E-Print Network (OSTI)

, such as polymethacrylic acid (PM.AA) and polyacrylic acid (PAA) are used as dispersants (1). Similarly, previous work from as dispersion additives in the processing ofceramic particles. Only carboxylic acids containing one or more, particle packing, and dispersant adsorption characeristics indicated that carboxylic acid groups

Aksay, Ilhan A.

212

Quantum nuclear effects on surfaces and dispersion bonded systems  

E-Print Network (OSTI)

Quantum nuclear effects on surfaces and dispersion bonded systems Erlend Davidson A dissertation all system types. In particular long range van der Waals dispersion forces and quantum nuclear effects of the art methods to include van der Waals dispersion and quantum nuclear effects on a range of well defined

Guillas, Serge

213

Perforation patterned electrical interconnects  

DOE Patents (OSTI)

This disclosure describes systems and methods for increasing the usable surface area of electrical contacts within a device, such as a thin film solid state device, through the implementation of electrically conductive interconnects. Embodiments described herein include the use of a plurality of electrically conductive interconnects that penetrate through a top contact layer, through one or more multiple layers, and into a bottom contact layer. The plurality of conductive interconnects may form horizontal and vertical cross-sectional patterns. The use of lasers to form the plurality of electrically conductive interconnects from reflowed layer material further aids in the manufacturing process of a device.

Frey, Jonathan

2014-01-28T23:59:59.000Z

214

E-Print Network 3.0 - atmospheric dispersion experiment Sample...  

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

- WIND DISPERSAL IN FRESHWATER WETLANDS: KNOWLEDGE FOR CONSERVATION AND RESTORATION - 271 Applied... , dispersal by wind is often overlooked because dispersal by water is ......

215

Test results of a ceramic-based carbon monoxide sensor in the automotive exhaust manifold  

SciTech Connect

A prototype CO sensor based on the anatase phase of TiO{sub 2} was fabricated and tested in a Ford V6 engine. Fuel combustion was programmed to be near stoichiometric conditions, and emissions were monitored with an FT-IR analytical instrument. The sensor, positioned near the oxygen sensor in the exhaust manifold, was successfully tested for 50 cycles of revving and idling, and was observed to respond quickly and reproducibly. The sensor response was correlated to the CO concentration at specific engine temperatures and was found to vary systematically with increasing concentrations. The results are promising and the sensor shows potentials to monitor the efficiency of the catalytic converter.

Azad, A.M.; Younkman, L.B.; Akbar, S.A. [Ohio State Univ., Columbus, OH (United States)

1996-12-31T23:59:59.000Z

216

Smith theory, L2 cohomology, isometries of locally symmetric manifolds and moduli spaces of curves  

E-Print Network (OSTI)

We investigate periodic diffeomorphisms of non-compact aspherical manifolds (and orbifolds) and describe a class of spaces that have no homotopically trivial periodic diffeomorphisms. Prominent examples are moduli spaces of curves and aspherical locally symmetric spaces with non-vanishing Euler characteristic. In the irreducible locally symmetric case, we show that no complete metric has more symmetry than the locally symmetric metric. In the moduli space case, we build on work of Farb and Weinberger and prove an analogue of Royden's theorem for complete finite volume metrics.

Avramidi, Grigori

2011-01-01T23:59:59.000Z

217

SO(10) Grand Unification in M theory on a G2 manifold  

E-Print Network (OSTI)

We consider Grand Unified Theories based on $SO(10)$ which originate from string/$M$ theory on $G_2$ manifolds or Calabi-Yau spaces with discrete symmetries. In this framework we are naturally led to a novel solution of the doublet-triplet splitting problem previously considered by Dvali which involves an extra vector-like Standard Model family and light, but weakly coupled colour triplets. These additional states are predicted to be accessible at the LHC and also induce R-parity violation. Gauge coupling unification occurs with a larger GUT coupling.

Acharya, Bobby S; Romao, Miguel Crispim; King, Stephen F; Pongkitivanichkul, Chakrit

2015-01-01T23:59:59.000Z

218

Non-Dispersive, Accelerated Matter-Waves  

E-Print Network (OSTI)

It is shown that under certain dynamical conditions a material wave packet displays coherent, non-dispersive accelerated evolution in gravitational field over a modulated atomic mirror. The phenomenon takes place as a consequence of simultaneous presence of the dynamical localization and the coherent Fermi acceleration for the same modulation amplitude. It is purely a quantum mechanical effect as the windows of modulation strengths supporting dynamical localization and Fermi acceleration overlap for larger effective Plank constant. Present day experimental techniques make it feasible to realize the system in laboratory.

Farhan Saif; Khalid Naseer; Muhammad Ayub

2014-06-22T23:59:59.000Z

219

Solid electrolytes strengthened by metal dispersions  

DOE Patents (OSTI)

An improvement in solid electrolytes of advanced secondary batteries of the sodium-sulfur, sodium-halogen, and like combinations is achieved by providing said battery with a cermet electrolyte containing a metal dispersion ranging from 0.1 to 10.0 vol. % of a substantially nonreactive metal selected from the group consisting essentially of Pt, Cr, Fe, Co, Ni, Nb, their alloys, and their physical mixtures in the elemental or uncombined state, the remainder of said cermet being an ion-conductive ceramic material.

Lauf, R.J.; Morgan, C.S.

1981-10-05T23:59:59.000Z

220

Solid electrolytes strengthened by metal dispersions  

DOE Patents (OSTI)

An improvement in solid electrolytes of advanced secondary batteries of the sodium-sulfur, sodium-halogen, and like combinations is achieved by providing said battery with a cermet electrolyte containing a metal dispersion ranging from 0.1 to 10.0 vol. % of a substantially nonreactive metal selected from the group consisting essentially of Pt, Cr, Fe, Co, Ni, Nb, their alloys, and their physical mixtures in the elemental or uncombined state, the remainder of said cermet being an ion-conductive ceramic material.

Lauf, Robert J. (Oak Ridge, TN); Morgan, Chester S. (Oak Ridge, TN)

1983-01-01T23:59:59.000Z

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


221

Disorder Driven Roughening Transitions of Elastic Manifolds and Periodic Elastic Media  

E-Print Network (OSTI)

Abstract. The simultaneous effect of both disorder and crystal-lattice pinning on the equilibrium behavior of oriented elastic objects is studied using scaling arguments and a functional renormalization group technique. Our analysis applies to elastic manifolds, e.g., interfaces, as well as to periodic elastic media, e.g., charge-density waves or flux-line lattices. The competition between both pinning mechanisms leads to a continuous, disorder driven roughening transition between a flat state where the mean relative displacement saturates on large scales and a rough state with diverging relative displacement. The transition can be approached by changing the impurity concentration or, indirectly, by tuning the temperature since the pinning strengths of the random and crystal potential have in general a different temperature dependence. For D dimensional elastic manifolds interacting with either random-field or random-bond disorder a transition exists for 2 roughening transition exists only if the ratio p of the periodicities of the medium and the crystal lattice exceeds the critical value pc = 6/? ? ?. For p < pc the medium is always flat. Critical exponents are calculated in a double expansion in = p2 /p2 c ? 1 and ? = 4 ? D and fulfill the scaling relations of random field models. 1

unknown authors

2008-01-01T23:59:59.000Z

222

Global dynamics and inflationary center manifold and slow-roll approximants  

E-Print Network (OSTI)

We consider the familiar problem of a minimally coupled scalar field with quadratic potential in flat Friedmann-Lema\\^itre-Robertson-Walker cosmology to illustrate a number of techniques and tools, which can be applied to a wide range of scalar field potentials and problems in e.g. modified gravity. We present a global dynamical systems description that yields a global understanding of the solution space, including asymptotic features. We introduce dynamical systems techniques such as center manifold expansions and use Pad\\'e approximants to obtain improved approximations for the `attractor solution' at early times. We also show that future asymptotic behavior is associated with a limit cycle, which shows that self-similarity is asymptotically broken toward the future, and give approximative expressions for this behavior. We then combine these results to obtain global approximations for the attractor solution, which, e.g., might be used in the context of global measures. In addition we elucidate the connection between slow-roll based approximations and the attractor solution, and compare these approximations with the center manifold based approximants.

Artur Alho; Claes Uggla

2014-06-02T23:59:59.000Z

223

Average values and dispersion (in parentheses)  

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

Average values and dispersion (in parentheses) Average values and dispersion (in parentheses) Base-pair Parameters --------------------------------------------------------------------------------------- Shear Stretch Stagger Buckle Propeller Opening 3DNA A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.13(7.77) -11.79(4.14) 0.57(2.80) B 0.00(0.21) -0.15(0.12) 0.09(0.19) 0.53(6.74) -11.35(5.26) 0.63(3.05) CEHS A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.13(7.75) -11.82(4.14) 0.56(2.78) B 0.00(0.21) -0.14(0.12) 0.09(0.19) 0.53(6.73) -11.37(5.27) 0.62(3.03) CompDNA A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.12(7.70) -11.81(4.14) 0.56(2.79) B 0.00(0.21) -0.15(0.12) 0.09(0.19) 0.53(6.70) -11.37(5.26) 0.62(3.03) Curves A 0.01(0.23) -0.18(0.10) 0.02(0.25) -0.13(7.85) -11.76(4.12) 0.57(2.80)

224

Rovibrational dynamics of the strontium molecule in the A1u+, c3u, and a3u+ manifold from state-of-the-art ab initio calculations  

E-Print Network (OSTI)

Rovibrational dynamics of the strontium molecule in the A1u+, c3u, and a3u+ manifold from state OF CHEMICAL PHYSICS 136, 194306 (2012) Rovibrational dynamics of the strontium molecule in the A 1 + u , c3 u for the electronic states in the A 1 + u , c3 u, and a 3 + u manifold of the strontium dimer, the spin

Koch, Christiane

225

Preparation of natural brucite nanofibers by the dispersion method  

Science Journals Connector (OSTI)

The preparation of natural brucite nanofibers through dispersion by the wet process is described. The test results indicate that brucite fibers can be well dispersed by using sodium dioctyl sulfosuccinate (OT) as the dispersant at a dispersant/fiber mass ratio of 0.15:1, dispersing for 30 min at a water/solid mass ratio of 20:1. The prepared nanofibers were characterized with X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). It is shown that the prepared single brucite nanofiber is around 30 nm in diameter and the talus of the nonsingle brucite nanofibers is about 50-150 nm in diameter. Natural brucite mineral fibers were treated by the dispersion method to obtain nanomaterials. These fibers have significant advantages over artificial nanofibers both in yield and in cost.

Li Xu; Wen Ni; Wenping Li; Xingde Liu; Hailong Yang; Xiaoguang Yang

2008-01-01T23:59:59.000Z

226

Hierarchically Ordered Cadmium Sulfide Nanowires Dispersed in Aqueous Solution  

Science Journals Connector (OSTI)

The paper reports on the preparation, characterization, and dispersion of cadmium sulfide (CdS) nanowires using ordered mesoporous silica, SBA-15, as a template. A homogeneous and stable dispersion of hierarchically ordered CdS nanowires in water ...This work demonstrates the formation of cadmium sulfide (CdS) nanowires. These nanowires are templated by mesoporous SBA-15 and their connectivity is tuned by the number of nanoconnectors (templated by micropores). They form stable dispersions in aqueous sodium dodecyl sulfate (SDS) solutions.

Rajagopalan Thiruvengadathan; Oren Regev

2005-05-17T23:59:59.000Z

227

Atmospheric Dispersion Modeling in Safety Analyses; GENII  

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

Workshop to Discuss Issues Regarding Deposition Workshop to Discuss Issues Regarding Deposition Velocity June 5-6, 2012 Jeremy Rishel Bruce Napier Atmospheric Dispersion Modeling in Safety Analyses: GENII Today's Presentation.... Will provide a high-level overview of the GENII codes. Will cover basic aspects of GENII's acute atmospheric transport model. Will review the GENII deposition model that is used to estimate the deposition velocity used in plume depletion. 2 GENII Development History 1988 - GENII V1 released ICRP-26/30/48 dosimetry 1990 - GENII V1.485 stabilized Current DOE Toolbox Version 1992 - GENII-S stochastic version 2004 - GENII V2 ICRP-72 age-dependent dosimetry Federal Guidance Report 13 risk factors

228

Dispersion compensation in chirped pulse amplification systems  

DOE Patents (OSTI)

A chirped pulse amplification system includes a laser source providing an input laser pulse along an optical path. The input laser pulse is characterized by a first temporal duration. The system also includes a multi-pass pulse stretcher disposed along the optical path. The multi-pass pulse stretcher includes a first set of mirrors operable to receive input light in a first plane and output light in a second plane parallel to the first plane and a first diffraction grating. The pulse stretcher also includes a second set of mirrors operable to receive light diffracted from the first diffraction grating and a second diffraction grating. The pulse stretcher further includes a reflective element operable to reflect light diffracted from the second diffraction grating. The system further includes an amplifier, a pulse compressor, and a passive dispersion compensator disposed along the optical path.

Bayramian, Andrew James; Molander, William A.

2014-07-15T23:59:59.000Z

229

Electromagnetic waves with nonlinear dispersion law  

E-Print Network (OSTI)

Last year physicists in Europe have measured the velocity of the neutrinos particles. They found the neutrinos moving faster than the speed of light in vacuum. This result means that Einstein's relativity principle and its consequences in modern physics need a global additional renovation. In present paper the part of this problem is considered in terms of basic Maxwell's method only. By means of introduction a diffusion like displacement current the new super wave equation was derived, which permits of its solution be described the electromagnetic waves moving some faster than the conventional speed of light in vacuum especially in a gamma ray of a very short wave length region. The unique properties of these waves are that they undergo nonlinear dispersion law, uppermost limit of which is restricted. Discussion of further experimental problems and a number of estimations are given for the macro physic super wave equations also.

Pavel Mednis

2012-02-08T23:59:59.000Z

230

Radiological Dispersion Devices and Basic Radiation Science  

Science Journals Connector (OSTI)

Introductory physics courses present the basic concepts of radioactivity and an overview of nuclear physics that emphasizes the basic decay relationship and the various types of emitted radiation. Although this presentation provides insight into radiological science it often fails to interest students to explore these concepts in a more rigorous manner. One reason for limited student interest is the failure to link the discussion to topics of current interest. The author has found that presenting this material with a link to radiological dispersion devices (RDDs) or dirty bombs and their associated health effects provides added motivation for students. The events of Sept. 11 2001 and periodic media focus on RDDs heighten student interest from both a scientific curiosity as well as a personal protection perspective. This article presents a framework for a more interesting discussion of the basics of radiation science and their associated health effects. The presentation can be integrated with existing radioactivitylectures or added as a supplementary or enrichment activity.

Joseph John Bevelacqua

2010-01-01T23:59:59.000Z

231

Confined Zone Dispersion Project: A DOE assessment  

SciTech Connect

The goal of the US Department of Energy (DOE) Clean Coal Technology (CCT) program is to furnish the energy marketplace with a number of advanced, more efficient, and environmentally responsible coal utilization technologies through demonstration projects. These projects seek to establish the commercial feasibility of the most promising advanced coal technologies that have developed beyond the proof-of-concept (POC) stage. This document serves as a DOE post-project assessment of the Confined Zone Dispersion Project in CCT Round 3. In 1990, Bechtel Corporation entered into a cooperative agreement to conduct the demonstration project. The Seward Power Station of Pennsylvania Electric Company (now GPU Genco) was the host site. DOE funded 43 percent of the total project cost of $12,173,000. The project was started in June 1990 and was scheduled to be completed in June 1993. As a result of various operating problems, the schedule was extended into 1994 without additional cost to DOE. Bechtel provided the additional financing and GPU Genco provided electricity, steam, and water to operate the unit. The independent evaluation contained herein is based primarily on information from Bechtel's final technical report (1994) as well as other references cited. Confined Zone Dispersion (CZD) is a flue gas desulfurization (FGD) process that removes sulfur dioxide (SO{sub 2}). A finely atomized slurry of reactive lime, calcium hydroxide or Ca(OH){sub 2} is injected into the flue-gas duct work, between the air preheater and the second-stage ESP. The lime reacts with the SO{sub 2}, forming dry solid reaction products. The downstream ESP captures the 2 reaction products along with the fly ash entrained in the flue gas. The CZD process was demonstrated on Unit 5, a 147-MWe utility unit with two flue gas ducts. One of the ducts was extended to provide the requisite residence time and retrofitted with the CZD lime injection equipment.

NONE

1999-11-30T23:59:59.000Z

232

Synthesis and Evaluation of Wax Dispersant for Diesel  

Science Journals Connector (OSTI)

Synthesis and Evaluation of Wax Dispersant for Diesel ... We can predict that the sensitivity of diesels A and C will be better than that of diesel B. ...

Wangang Zheng; Shujun Wang; Jie Liu; Fanbin Meng; Yanshan Li; Huanqing Ma; Ting Li

2014-02-28T23:59:59.000Z

233

Application of microbicides for the storage protection of mineral dispersions  

Science Journals Connector (OSTI)

The dispersants, usually based today on salts of polyacrylic acid (PAA), represent a rich supply of... Figure 2 Microbial contamination an...

P. Schwarzentruber; P. A. C. Gane

2005-01-01T23:59:59.000Z

234

Chirped Laser Dispersion Spectroscopy with Directly Modulated Quantum Cascade Laser  

Science Journals Connector (OSTI)

A feasibility study of chirped laser dispersion spectroscopy (CLaDS) with utilizing direct modulation of a quantum cascade laser instead of external modulators is presented....

Hangauer, Andreas; Spinner, Georg; Nikodem, Michal; Wysocki, Gerard

235

Dispersion of Cloud Droplet Size Distributions, Cloud Parameterization...  

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

Dispersion of Cloud Droplet Size Distributions, Cloud Parameterizations, and Indirect Aerosol Effects P. H. Daum and Y. Liu Brookhaven National Laboratory Upton, New York...

236

Update 4 to: A Dispersion Modeling Analysis of Downwash from...  

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

and maximum loads will not cause or contribute to exceedances of the National Ambient Air Quality Standards (NAAQS). Update 4 to: A Dispersion Modeling Analysis of Downwash...

237

Quantitative characterization of the water trimer torsional manifold by terahertz laser spectroscopy and theoretical analysis. II. ,,H2O...3  

E-Print Network (OSTI)

Quantitative characterization of the water trimer torsional manifold by terahertz laserLaughlin,c) Christy J. Keoshian, Ernest Michael, Jeff D. Cruzan,d) and Richard J. Saykallye) Department of Chemistry, University of California, Berkeley, California 94720 Ad van der Avoirdf) Institute of Theoretical Chemistry

Cohen, Ronald C.

238

Motion Tasks for Robot Manipulators on Embedded 2-D Manifolds Xanthi Papageorgiou, Savvas G. Loizou and Kostas J. Kyriakopoulos  

E-Print Network (OSTI)

including robotic surface painting, surface cleaning, surface inspection, etc. Our main motivation comesMotion Tasks for Robot Manipulators on Embedded 2-D Manifolds Xanthi Papageorgiou, Savvas G. Loizou of a robotic manipulator across the surface of an object in the workspace. Three typical tasks are considered

Loizou, Savvas G.

239

Resume of definitions of "tangent vector" Let M be a manifold, m M, and X = (X1  

E-Print Network (OSTI)

Resum´e of definitions of "tangent vector" Let M be a manifold, m M, and X = (X1 , · · ·Xd ) : U Joel Feldman. 2008. All rights reserved. September 30, 2008 Resum´e of definitions of "tangent vector rights reserved. September 30, 2008 Resum´e of definitions of "tangent vector" 2 #12;

Feldman, Joel

240

Nonperturbative theory for the dispersion self-energy of atoms  

Science Journals Connector (OSTI)

We go beyond the approximate series expansions used in the dispersion theory of finite-size atoms. We demonstrate that a correct, and nonperturbative, theory dramatically alters the dispersion self-energies of atoms. The nonperturbed theory gives as much as 100% corrections compared to the traditional series-expanded theory for the smaller noble gas atoms.

Priyadarshini Thiyam; C. Persson; I. Brevik; Bo E. Sernelius; Mathias Bostrm

2014-11-14T23:59:59.000Z

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


241

Synthesis of dispersed surface waves by means of Fourier transform  

Science Journals Connector (OSTI)

...50T 60r Angular velocity in degree/~usec Fig. 5. Dispersion curve obtained by...I .01 . I .5 Frequency in cycle/,usec Fig. 6. Dispersion curve obtained by...of Fourier transform. ~ - ~ - - ~ SO ~usec O0 i -" i ";'".-.-i , , I...

Yasuo Sat

242

Phonon dispersion of carbon nanotubes J. Maultzscha,*, S. Reicha  

E-Print Network (OSTI)

Phonon dispersion of carbon nanotubes J. Maultzscha,*, S. Reicha , C. Thomsena , E. Dobardz the phonon dispersion relations of single-wall carbon nanotubes calculated within a force-constants approach 6 and 12 cm21 independent of the tube diameter. The order of the high-energy modes at the G

Nabben, Reinhard

243

Demonstration of Electrical Dispersion Compensation of Single Sideband Optical Transmission  

E-Print Network (OSTI)

Demonstration of Electrical Dispersion Compensation of Single Sideband Optical Transmission P. M describe a demonstration of electrical chromatic dispersion compensation of 10 Gb/s single sideband optical signals. Eye-opening and bit error rates of less than 10-10 were achieved after compensation of -2040 ps

Haddadi, Hamed

244

A study of micro fiber dispersion using digital image analysis  

E-Print Network (OSTI)

of this dissertation is to investigate the use of texture analysis as a tool to micro fiber dispersion measurement. Micro fiber dispersion can be found in many applications such as in paper and industry powder engineering. Three cases related to micro fiber...

Hendrarsakti, Jooned

2004-11-15T23:59:59.000Z

245

Electroacoustics of Particles Dispersed in Polymer Gel  

SciTech Connect

This study examines the acoustic electrophoresis of particles dispersed in polymer hydrogels, with the particle size either less than or greater than the gel mesh size. When the particles are smaller than the gel mesh size, their acoustic vibration is resisted by only the background water medium, and the measured dynamic electrophoretic mobility, ?d (obtained in terms of colloid vibration current, CVI), is the same as in water. For the case of particles larger than the gel mesh size, ?d is decreased due to trapping, and the net decrease depends on the viscoelastic properties of the gel. The gel mesh size was varied by varying its crosslink density, the latter being characterized as the storage modulus, G. The dependence of mobility on G, for systems of a given particle size, and on particle size, for gels of a given G, are investigated. The measured mobility remains constant as G is increased (i.e., mesh size is decreased) up to a value of approximately 300 Pa, beyond which it decreases. In the second set of measurements, the trapped particle size was increased in a gel medium of constant mesh size, with G approximately 100 Pa. In this case, the measured ?d is found to be effectively constant over the particle size range studied (14-120 nm), i.e., it is independent of the degree of trapping as expressed by the ratio of the particle size to the mesh size.

Bhosale, Prasad S.; Chun, Jaehun; Berg, John C.

2011-06-27T23:59:59.000Z

246

Two-point derivative dispersion relations  

E-Print Network (OSTI)

A new derivation is given for the representation, under certain conditions, of the integral dispersion relations of scattering theory through local forms. The resulting expressions have been obtained through an independent procedure to construct the real part, and consist of new mathematical structures of double infinite summations of derivatives. In this new form the derivatives are calculated at the generic value of the energy $E$ and separately at the reference point $E=m$ that is the lower limit of the integration. This new form may be more interesting in certain circumstances and directly shows the origin of the difficulties in convergence that were present in the old truncated forms called standard-DDR. For all cases in which the reductions of the double to single sums were obtained in our previous work, leading to explicit demonstration of convergence, these new expressions are seen to be identical to the previous ones. We present, as a glossary, the most simplified explicit results for the DDR's in the cases of imaginary amplitudes of forms $(E/m)^\\lambda[\\ln (E/m)]^n$, that cover the cases of practical interest in particle physics phenomenology at high energies. We explicitly study the expressions for the cases with $\\lambda$ negative odd integers, that require identification of cancelation of singularities, and provide the corresponding final results.

Erasmo Ferreira; Javier Sesma

2014-03-24T23:59:59.000Z

247

Modelling long-distance seed dispersal in heterogeneous landscapes.  

SciTech Connect

1. Long-distance seed dispersal is difficult to measure, yet key to understanding plant population dynamics and community composition. 2. We used a spatially explicit model to predict the distribution of seeds dispersed long distances by birds into habitat patches of different shapes. All patches were the same type of habitat and size, but varied in shape. They occurred in eight experimental landscapes, each with five patches of four different shapes, 150 m apart in a matrix of mature forest. The model was parameterized with smallscale movement data collected from field observations of birds. In a previous study we validated the model by testing its predictions against observed patterns of seed dispersal in real landscapes with the same types and spatial configuration of patches as in the model. 3. Here we apply the model more broadly, examining how patch shape influences the probability of seed deposition by birds into patches, how dispersal kernels (distributions of dispersal distances) vary with patch shape and starting location, and how movement of seeds between patches is affected by patch shape. 4. The model predicts that patches with corridors or other narrow extensions receive higher numbers of seeds than patches without corridors or extensions. This pattern is explained by edgefollowing behaviour of birds. Dispersal distances are generally shorter in heterogeneous landscapes (containing patchy habitat) than in homogeneous landscapes, suggesting that patches divert the movement of seed dispersers, holding them long enough to increase the probability of seed defecation in the patches. Dispersal kernels for seeds in homogeneous landscapes were smooth, whereas those in heterogenous landscapes were irregular. In both cases, long-distance (> 150 m) dispersal was surprisingly common, usually comprising approximately 50% of all dispersal events. 5. Synthesis . Landscape heterogeneity has a large influence on patterns of long-distance seed dispersal. Our results suggest that long-distance dispersal events can be predicted using spatially explicit modelling to scale-up local movements, placing them in a landscape context. Similar techniques are commonly used by landscape ecologists to model other types of movement; they offer much promise to the study of seed dispersal.

Levey, Douglas, J.; Tewlsbury, Joshua, J.; Bolker, Benjamin, M.

2008-01-01T23:59:59.000Z

248

Stabilisation of titania pigment particles with anionic polymeric dispersants  

Science Journals Connector (OSTI)

The stabilisation of titania pigment in dry water-based paint films with anionic polymeric dispersants containing carboxylate groups was investigated. The results were compared to those obtained from rheological analysis of titania pigment suspensions. The polymeric dispersants chosen were polyacrylic acid and polyacrylamides copolymer modified with carboxylate groups. AFM and TEM were used to assess the distribution of the titania pigment particles in the surface and bulk, respectively, of the paint films which were then compared to the gloss and surface roughness of these films. In the absence of a dispersant, the pigment distribution in the paint films was not uniform and relatively large pigment aggregates appeared at the surface, resulting in a rough surface and low gloss. However, anionic polymeric dispersants decreased surface roughness and increased the gloss of the dry paint films, with the dispersant concentration considerably enhancing pigment distribution in the paint films. An inverse correlation of paint film gloss with surface roughness was observed. The optimum pigment distribution in the dry state was found at dispersant concentrations much higher than those needed to obtain minimum yield stress in aqueous suspensions. This suggests that in the dry state, electrostatic stabilisation is substantially reduced or possibly absent, therefore a higher dispersant concentration is needed to achieve pigment stabilisation.

Saeed Farrokhpay; Gayle E. Morris; Daniel Fornasiero; Peter Self

2010-01-01T23:59:59.000Z

249

Remarks on the concept of dispersion in a curved linac  

SciTech Connect

A next-generation linear collider is expected to span tens of kilometers in length. For various reasons, it may be desirable to house such an accelerator in a tunnel that follows the earth's curvature rather that in a 'laser-straight' tunnel. One side effect of opting for a curved linac is the introduction of vertical dispersion. In recent years, much work has been dedicated to understand and evaluate the impact of the presence of dispersion on emittance preservation. While performing simulations with our in-house code (CHEF) we observed a discrepancy between the dispersion function it produces and that computed using other codes in use within the accelerator community. Understanding the origin and the meaning of this discrepancy required a re-examination of the meaning of the concept of dispersion in the context of a linac. The object of this note is to document our findings. We establish that the default dispersion algorithm used by CHEF corresponds to a different, and ultimately more appropriate, definition of the dispersion in presence of acceleration. Not surprisingly, a consistent definition of dispersion restores agreement between codes.

Ostiguy, Jean-Francois; /Fermilab

2009-01-01T23:59:59.000Z

250

Invariance properties of boundary sets of open embeddings of manifolds and their application to the abstract boundary  

E-Print Network (OSTI)

The {\\em abstract boundary\\/} (or {\\em {\\em a\\/}-boundary\\/}) of Scott and Szekeres \\cite{Scott94} constitutes a ``boundary'' to any $n$-dimensional, paracompact, connected, Hausdorff, $C^\\infty$-manifold (without a boundary in the usual sense). In general relativity one deals with a {\\em space-% time\\/} $(\\cM,g)$ (a 4-dimensional manifold $\\cM$ with a Lorentzian metric $g$), together with a chosen preferred class of curves in $\\cM$. In this case the {\\em a\\/}-boundary points may represent ``singularities'' or ``points at infinity''. Since the {\\em a\\/}-boundary itself, however, does not depend on the existence of further structure on the manifold such as a Lorentzian metric or connection, it is possible for it to be used in many contexts. In this paper we develop some purely topological properties of abstract boundary sets and abstract boundary points ({\\em a\\/}-boundary points). We prove, amongst other things, that compactness is invariant under boundary set equivalence, and introduce another invariant concept ({\\em isolation\\/}), which encapsulates the notion that a boundary set is ``separated'' from other boundary points of the same embedding. ....... [The abstract continues in paper proper - truncated to fit here.

Christopher J. Fama; Susan M. Scott

1994-06-21T23:59:59.000Z

251

Aeroassisted orbital transfer vehicle guidance performance in the presence of density dispersions  

E-Print Network (OSTI)

Dispersions Analytic Predictor-Corrector AV, Sensitivity to Step Dispersions Analytic Predictor-Corrector DV, Sensitivity to Spike Dispersions Energy Controller AV, Sensitivity to Step Dispersions 42 44 46 49 49 51 53 56 LIST OF FIGURES...-Corrector AV, Sensitivity to a 10000 foot Duration Step Dispersions . AV, Comparison for 0. 20 Magnitude, 10000 foot Duration, Step Dispersion HPC Bank Angle History for -20% Biased 1962 Standard Atmosphere Page 58 67 67 69 71 71 72 73 75 27...

Fitzgerald, Steve Matthew

2012-06-07T23:59:59.000Z

252

Atmospheric Dispersion Model Validation in Low Wind Conditions  

SciTech Connect

Atmospheric plume dispersion models are used for a variety of purposes including emergency planning and response to hazardous material releases, determining force protection actions in the event of a Weapons of Mass Destruction (WMD) attack and for locating sources of pollution. This study provides a review of previous studies that examine the accuracy of atmospheric plume dispersion models for chemical releases. It considers the principles used to derive air dispersion plume models and looks at three specific models currently in use: Aerial Location of Hazardous Atmospheres (ALOHA), Emergency Prediction Information Code (EPIcode) and Second Order Closure Integrated Puff (SCIPUFF). Results from this study indicate over-prediction bias by the EPIcode and SCIPUFF models and under-prediction bias by the ALOHA model. The experiment parameters were for near field dispersion (less than 100 meters) in low wind speed conditions (less than 2 meters per second).

Sawyer, Patrick

2007-11-01T23:59:59.000Z

253

Hair treatment process providing dispersed colors by light diffraction  

DOE Patents (OSTI)

Hair was coated with polymer-containing fluid and then hot pressed to form a composite of hair and a polymer film imprinted with a nanopattern. Polychromatic light incident on the nanopattern is diffracted into dispersed colored light.

Lamartine, Bruce Carvell; Orler, E. Bruce; Sutton, Richard Matthew Charles; Song, Shuangqi

2013-12-17T23:59:59.000Z

254

Enhanced Dispersion from Tall Stacks Near Modern Wind Mills  

Science Journals Connector (OSTI)

Dispersion modeling of emissions from tall stacks is often done with regulatory models, based on the Gaussian plume concept. When the plumes of tall stacks are influenced by the turbulence of nearby wind mills, t...

J. J. Erbrink; Luc Verhees

2014-01-01T23:59:59.000Z

255

Hair treatment process providing dispersed colors by light diffraction  

DOE Patents (OSTI)

Hair was coated with polymer-containing fluid and then hot pressed to form a composite of hair and a polymer film imprinted with a nanopattern. Polychromatic light incident on the nanopattern is diffracted into dispersed colored light.

Lamartine, Bruce Carvell; Orler, E. Bruce; Sutton, Richard Matthew Charles; Song, Shuangqi

2014-11-11T23:59:59.000Z

256

RELIABILITY OF WIND POWER FROM DISPERSED SITES: A PRELIMINARY ASSESSMENT  

E-Print Network (OSTI)

ON METHODOLOGY: FROM WIND POWER FREQUENCY TO LOSS-OF-LOADJ.P. , "Some Aspects of Wind Power Statistics, " J. of Appl.SCTION Reliability of Wind Power From Dispersed Sites: A Pr

Kahn, E.

2011-01-01T23:59:59.000Z

257

Structural characteristics, dispersion, and modification of fibrous brucite  

Science Journals Connector (OSTI)

Fibrous brucite has very unique structure and physical properties. Brucite fibers were exfoliated into single nanofibers by ... fiber has a consistent morphology, and fibrous brucite is dispersed and modified wit...

Xi Cao; Xiu-yun Chuan

2014-01-01T23:59:59.000Z

258

Nonphotochemical hole burning and dispersive kinetics in amorphous solids.  

E-Print Network (OSTI)

??Results of an extensive study, covering burn intensities in the nW to {dollar}?{dollar}W/cm{dollar}2{dollar} range, of dispersive hole growth kinetics are reported for Oxazine 720 in (more)

Kenney, Michael Joseph

1990-01-01T23:59:59.000Z

259

Ultrasonication technique: a method for dispersing nanoclay in wood adhesives  

Science Journals Connector (OSTI)

The efficiency of ultrasonication technique to disperse nanoclay in polyvinyl acetate (PVA) was examined. A hydrophilic nanoclay was added to PVA, and its effects on bond strength of wood joints were determined. The results of bond strength measured ...

Alireza Kaboorani; Bernard Riedl; Pierre Blanchet

2013-01-01T23:59:59.000Z

260

Dispersion interferometer using modulation amplitudes on LHD (invited)  

SciTech Connect

Since a dispersion interferometer is insensitive to mechanical vibrations, a vibration compensation system is not necessary. The CO{sub 2} laser dispersion interferometer with phase modulations on the Large Helical Device utilizes the new phase extraction method which uses modulation amplitudes and can improve a disadvantage of the original dispersion interferometer: measurement errors caused by variations of detected intensities. The phase variation within 2 10{sup 17} m{sup ?3} is obtained without vibration compensation system. The measured line averaged electron density with the dispersion interferometer shows good agreement with that with the existing far infrared laser interferometer. Fringe jump errors in high density ranging up to 1.5 10{sup 20} m{sup ?3} can be overcome by a sufficient sampling rate of about 100 kHz.

Akiyama, T., E-mail: takiyama@lhd.nifs.ac.jp; Yasuhara, R.; Kawahata, K. [National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu 509-5292 (Japan); Okajima, S.; Nakayama, K. [Chubu University, Matsumoto-cho, Kasugai-shi, Aichi 487-8501 (Japan)

2014-11-15T23:59:59.000Z

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


261

Effects of Oil and Oil Dispersants on the Marine Environment  

Science Journals Connector (OSTI)

13 April 1971 research-article Effects of Oil and Oil Dispersants on the Marine Environment R. G. J. Shelton In the context of marine pollution, the term 'oil' can cover a very wide range of substances and usually...

1971-01-01T23:59:59.000Z

262

Bayesian Network Analysis of Radiological Dispersal Device Acquisitions  

E-Print Network (OSTI)

It remains unlikely that a terrorist organization could produce or procure an actual nuclear weapon. However, the construction of a radiological dispersal device (RDD) from commercially produced radioactive sources and conventional explosives could...

Hundley, Grant Richard

2012-02-14T23:59:59.000Z

263

GIS and plume dispersion modeling for population exposure assessment  

E-Print Network (OSTI)

. Traditional methods of dispersion modeling for the permitting of new sources and the monitoring of existing sources have allowed much room for error in terms of the effect of the pollutants on nearby populations (Hardikar, 1995). The capabilities of GIS...

Archer, Jeffrey Keith

2012-06-07T23:59:59.000Z

264

A dynamic model for the Lagrangian stochastic dispersion coefficient  

SciTech Connect

A stochastic sub-grid model is often used to accurately represent particle dispersion in turbulent flows using large eddy simulations. Models of this type have a free parameter, the dispersion coefficient, which is not universal and is strongly grid-dependent. In the present paper, a dynamic model for the evaluation of the coefficient is proposed and validated in decaying homogeneous isotropic turbulence. The grid dependence of the static coefficient is investigated in a turbulent mixing layer and compared to the dynamic model. The dynamic model accurately predicts dispersion statistics and resolves the grid-dependence. Dispersion statistics of the dynamically calculated constant are more accurate than any static coefficient choice for a number of grid spacings. Furthermore, the dynamic model produces less numerical artefacts than a static model and exhibits smaller sensitivity in the results predicted for different particle relaxation times.

Pesmazoglou, I.; Navarro-Martinez, S., E-mail: s.navarro@imperial.ac.uk [Department of Mechanical Engineering, Imperial College, London SW7 2AZ (United Kingdom); Kempf, A. M. [Chair of Fluid Dynamics, Institute for Combustion and Gasdynamics and Center for Computational Sciences and Simulation, Universitt Duisburg-Essen, Duisburg, 47048 (Germany)] [Chair of Fluid Dynamics, Institute for Combustion and Gasdynamics and Center for Computational Sciences and Simulation, Universitt Duisburg-Essen, Duisburg, 47048 (Germany)

2013-12-15T23:59:59.000Z

265

E-Print Network 3.0 - advective- dispersive formulation Sample...  

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

of the advection dispersion equation. 12;Point like injectionPoint like injection Transport... transport formulations and dispersion ... Source: Politcnica de Catalunya,...

266

E-Print Network 3.0 - anomalous dispersion phase-matching Sample...  

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

to travel at its luminal group velocity but phase-match to dispersive waves... dispersive radiation to be ... Source: Gaeta, Alexander L. - School of Applied and Engineering...

267

E-Print Network 3.0 - atmospheric dispersion study Sample Search...  

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

-WIND DISPERSAL IN FRESHWATER WETLANDS: KNOWLEDGE FOR CONSERVATION AND RESTORATION -271 Applied Vegetation Science 9: 271-278, 2006 Summary: , seed dispersal by water has been...

268

Low Cost Fabrication of Oxide Dispersion Strengthened Materials  

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

Low Cost Fabrication of Oxide Dispersion Low Cost Fabrication of Oxide Dispersion Strengthened Materials Background To obtain significant increases in the efficiency of coal fired power plants, steam pressure and temperature must be increased beyond current technology to advanced ultra-supercritical (A-USC) conditions -temperatures and pressures up to 760 degrees Celsius (°C) and 35 megapascals (MPa). The upper bounds of operating pressure and temperature are limited by the properties of the current set

269

Dispersive processes in models of regional radionuclide migration. Technical memorandum  

SciTech Connect

Three broad areas of concern in the development of aquifer scale transport models will be local scale diffusion and dispersion processes, regional scale dispersion processes, and numerical problems associated with the advection-dispersion equation. Local scale dispersion processes are fairly well understood and accessible to observation. These processes will generally be dominated in large scale systems by regional processes, or macro-dispersion. Macro-dispersion is primarily the result of large scale heterogeneities in aquifer properties. In addition, the effects of many modeling approximations are often included in the process. Because difficulties arise in parameterization of this large scale phenomenon, parameterization should be based on field measurements made at the same scale as the transport process of interest or else partially circumvented through the application of a probabilistic advection model. Other problems associated with numerical transport models include difficulties with conservation of mass, stability, numerical dissipation, overshoot, flexibility, and efficiency. We recommend the random-walk model formulation for Lawrence Livermore Laboratory's purposes as the most flexible, accurate and relatively efficient modeling approach that overcomes these difficulties.

Evenson, D.E.; Dettinger, M.D.

1980-05-01T23:59:59.000Z

270

3D CFD ELECTROCHEMICAL AND HEAT TRANSFER MODEL OF AN INTERNALLY MANIFOLDED SOLID OXIDE ELECTROLYSIS CELL  

SciTech Connect

A three-dimensional computational fluid dynamics (CFD) electrochemical model has been created to model high-temperature electrolysis cell performance and steam electrolysis in an internally manifolded planar solid oxide electrolysis cell (SOEC) stack. This design is being evaluated at the Idaho National Laboratory for hydrogen production from nuclear power and process heat. Mass, momentum, energy, and species conservation and transport are provided via the core features of the commercial CFD code FLUENT. A solid-oxide fuel cell (SOFC) model adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. The FLUENT SOFC user-defined subroutine was modified for this work to allow for operation in the SOEC mode. Model results provide detailed profiles of temperature, operating potential, steam-electrode gas composition, oxygen-electrode gas composition, current density and hydrogen production over a range of stack operating conditions. Single-cell and five-cell results will be presented. Flow distribution through both models is discussed. Flow enters from the bottom, distributes through the inlet plenum, flows across the cells, gathers in the outlet plenum and flows downward making an upside-down ''U'' shaped flow pattern. Flow and concentration variations exist downstream of the inlet holes. Predicted mean outlet hydrogen and steam concentrations vary linearly with current density, as expected. Effects of variations in operating temperature, gas flow rate, oxygen-electrode and steam-electrode current density, and contact resistance from the base case are presented. Contour plots of local electrolyte temperature, current density, and Nernst potential indicate the effects of heat transfer, reaction cooling/heating, and change in local gas composition. Results are discussed for using this design in the electrolysis mode. Discussion of thermal neutral voltage, enthalpy of reaction, hydrogen production, cell thermal efficiency, cell electrical efficiency, and Gibbs free energy are discussed and reported herein.

Grant L. Hawkes; James E. O'Brien; Greg Tao

2011-11-01T23:59:59.000Z

271

Lattice Boltzmann method for colloidal dispersions with phase change  

Science Journals Connector (OSTI)

Colloidal dispersions are known to undergo phase transition in a number of processes. This often gives rise to formation of structures in a flowing medium. In this paper, we present a model for flow of a colloidal dispersion with phase change. Two distribution functions are used. The colloid is described as a non-ideal fluid capable of phase change, but rather than taking the dispersion medium as the second fluid, a better choice is the dispersion (water plus colloid) which can be considered as an incompressible fluid. This choice allows a standard Lattice Boltzmann (LB) model for incompressible fluids to be used in combination with for the 'free-energy' LB model for the colloid. The coupling between the two fluids is the drag force on the colloid and the dependence of the viscosity of the overall fluid on the particle volume fraction. The problems raised by characteristic times and lengths have been treated. The main application considered is the growth dynamics or domain structuration of protein dispersions during dead-end filtration on a membrane surface.

B. Piaud; M.J. Clifton; S. Blanco; R. Fournier

2008-01-01T23:59:59.000Z

272

System and method for detection of dispersed broadband signals  

DOE Patents (OSTI)

A system and method for detecting the presence of dispersed broadband signals in real time are disclosed. The present invention utilizes a bank of matched filters for detecting the received dispersed broadband signals. Each matched filter uses a respective robust time template that has been designed to approximate the dispersed broadband signals of interest, and each time template varies across a spectrum of possible dispersed broadband signal time templates. The received dispersed broadband signal x(t) is received by each of the matched filters, and if one or more matches occurs, then the received data is determined to have signal data of interest. This signal data can then be analyzed and/or transmitted to Earth for analysis, as desired. The system and method of the present invention will prove extremely useful in many fields, including satellite communications, plasma physics, and interstellar research. The varying time templates used in the bank of matched filters are determined as follows. The robust time domain template is assumed to take the form w(t)=A(t)cos[l brace]2[phi](t)[r brace]. Since the instantaneous frequency f(t) is known to be equal to the derivative of the phase [phi](t), the trajectory of a joint time-frequency representation of x(t) is used as an approximation of [phi][prime](t). 10 figs.

Qian, S.; Dunham, M.E.

1999-06-08T23:59:59.000Z

273

System and method for detection of dispersed broadband signals  

DOE Patents (OSTI)

A system and method for detecting the presence of dispersed broadband signals in real time. The present invention utilizes a bank of matched filters for detecting the received dispersed broadband signals. Each matched filter uses a respective robust time template that has been designed to approximate the dispersed broadband signals of interest, and each time template varies across a spectrum of possible dispersed broadband signal time templates. The received dispersed broadband signal x(t) is received by each of the matched filters, and if one or more matches occurs, then the received data is determined to have signal data of interest. This signal data can then be analyzed and/or transmitted to Earth for analysis, as desired. The system and method of the present invention will prove extremely useful in many fields, including satellite communications, plasma physics, and interstellar research. The varying time templates used in the bank of matched filters are determined as follows. The robust time domain template is assumed to take the form w(t)=A(t)cos{2.phi.(t)}. Since the instantaneous frequency f(t) is known to be equal to the derivative of the phase .phi.(t), the trajectory of a joint time-frequency representation of x(t) is used as an approximation of .phi.'(t).

Qian, Shie (Austin, TX); Dunham, Mark E. (Los Alamos, NM)

1999-06-08T23:59:59.000Z

274

Method of Manufacturing Micro-Disperse Particles of Sodium Borohydride  

DOE Patents (OSTI)

A compact solid source of hydrogen gas, where the gas is generated by contacting water with micro-disperse particles of sodium borohydride in the presence of a catalyst, such as cobalt or ruthenium. The micro-disperse particles can have a substantially uniform diameter of 1-10 microns, and preferably about 3-5 microns. Ruthenium or cobalt catalytic nanoparticles can be incorporated in the micro-disperse particles of sodium borohydride, which allows a rapid and complete reaction to occur without the problems associated with caking and scaling of the surface by the reactant product sodium metaborate. A closed loop water management system can be used to recycle wastewater from a PEM fuel cell to supply water for reacting with the micro-disperse particles of sodium borohydride in a compact hydrogen gas generator. Capillary forces can wick water from a water reservoir into a packed bed of micro-disperse fuel particles, eliminating the need for using an active pump.

Kravitz, Stanley H. (Placitas, NM); Hecht, Andrew M. (Sandia Park, NM); Sylwester. Alan P. (Albuquerque, NM); Bell, Nelson S. (Albuquerque, NM)

2008-09-23T23:59:59.000Z

275

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008  

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

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008

276

Ecological Modelling 147 (2002) 2339 Dispersal success on spatially structured landscapes: when  

E-Print Network (OSTI)

Ecological Modelling 147 (2002) 23­39 Dispersal success on spatially structured landscapes: when do a simulation study in which we explored (1) the conditions under which landscape structure affects dispersal success and (2) the dependency of dispersal success on the choice of dispersal algorithm. We simulated

With, Kimberly A.

277

Lack of dispersion cancellation with classical phase-sensitive light  

SciTech Connect

Shapiro recently argued that nonlocal dispersion cancellation using entangled pairs of photons is essentially classical in nature, based on a comparison with a classical model in which two stationary, chaotic beams of light have phases and frequencies that are anticorrelated, which he refers to as 'phase-sensitive' light [J. H. Shapiro, Phys. Rev. A 81, 023824 (2010)]. It is shown here that there is no physical cancellation of dispersion for classical light of that kind and Shapiro's results merely reflect the fact that identical dispersion occurs in both beams. The origin of the cross correlations between the intensities of the two beams is shown to be completely different in the classical and quantum mechanical cases.

Franson, J. D. [Physics Department, University of Maryland, Baltimore County, Baltimore, Maryland 21250 (United States)

2010-02-15T23:59:59.000Z

278

Theory of angular dispersive imaging hard x-ray spectrographs  

E-Print Network (OSTI)

A spectrograph is an optical instrument that disperses photons of different energies into distinct directions and space locations, and images photon spectra on a position-sensitive detector. Spectrographs consist of collimating, angular dispersive, and focusing optical elements. Bragg reflecting crystals arranged in an asymmetric scattering geometry are used as the dispersing elements. A ray-transfer matrix technique is applied to propagate x-rays through the optical elements. Several optical designs of hard x-ray spectrographs are proposed and their performance is analyzed. Spectrographs with an energy resolution of 0.1 meV and a spectral window of imaging up to a few tens of meVs are shown to be feasible for inelastic x-ray scattering (IXS) spectroscopy applications. In another example, a spectrograph with a 1-meV spectral resolution and 85-meV spectral window of imaging is considered for Cu K-edge resonant IXS (RIXS).

Shvyd'ko, Yuri

2015-01-01T23:59:59.000Z

279

Black/White hole radiation from dispersive theories  

E-Print Network (OSTI)

We study the fluxes emitted by black holes when using dispersive field theories. We work with stationary one dimensional backgrounds which are asymptotically flat on both sides of the horizon. The asymptotic fluxes are governed by a 3x3 Bogoliubov transformation. The fluxes emitted by the corresponding white holes are regular and governed by the inverse transformation. We numerically compute the spectral properties of these fluxes for both sub- and superluminal quartic dispersion. The leading deviations with respect to the dispersionless flux are computed and shown to be governed by a critical frequency above which there is no radiation. Unlike the UV scale governing dispersion, its value critically depends on the asymptotic properties of the background. We also study the flux outside the robust regime. In particular we show that its low frequency part remains almost thermal but with a temperature which significantly differs from the standard one. Application to four dimensional black holes and Bose-Einstein condensates are in preparation.

Jean Macher; Renaud Parentani

2009-06-02T23:59:59.000Z

280

New ceramics containing dispersants for improved fracture toughness  

DOE Patents (OSTI)

The invention is a ceramic composition containing a new class of dispersant for hindering crack propagation by means of one or more energy-dissipative mechanisms. The composition is composed of a ceramic matrix with dispersed particles of a transformation-prone rare-earth niobate, tantalate or mixtures of these with each other and/or with a rare-earth vanadate. The dispersants, having a generic composition tRBO/sub 4/, where R is a rare-earth element, B if Nb or Ta and O is oxygen, are mixed in powder form with a powder of the matrix ceramic and sintered to produce a ceramic form or body. The crack-hindering mechanisms operates to provide improved performance over a wide range of temperature and operating conditions.

Nevitt, M.V.; Aldred, A.T.; Chan, Sai-Kit

1985-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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281

Polydispersity analysis of Taylor dispersion data: the cumulant method  

E-Print Network (OSTI)

Taylor dispersion analysis is an increasingly popular characterization method that measures the diffusion coefficient, and hence the hydrodynamic radius, of (bio)polymers, nanoparticles or even small molecules. In this work, we describe an extension to current data analysis schemes that allows size polydispersity to be quantified for an arbitrary sample, thereby significantly enhancing the potentiality of Taylor dispersion analysis. The method is based on a cumulant development similar to that used for the analysis of dynamic light scattering data. Specific challenges posed by the cumulant analysis of Taylor dispersion data are discussed, and practical ways to address them are proposed. We successfully test this new method by analyzing both simulated and experimental data for solutions of moderately polydisperse polymers and polymer mixtures.

Luca Cipelletti; Jean-Philippe Biron; Michel Martin; Herv Cottet

2014-08-26T23:59:59.000Z

282

Comparison of Average Transport and Dispersion Among a Gaussian, a  

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

Comparison of Average Transport and Dispersion Among a Gaussian, a Comparison of Average Transport and Dispersion Among a Gaussian, a Two-Dimensional, and a Three-Dimensional Model Comparison of Average Transport and Dispersion Among a Gaussian, a Two-Dimensional, and a Three-Dimensional Model The Nuclear Regulatory Commission's (NRC's) code for predicting off-site consequences, MACCS2 (Chanin, et al. 1998) (MELCOR Accident Consequence Code System, Version 2), uses a simplified model for atmospheric transport and d ispersion (ATD), that is, a straight-line Gaussian model. The MACCS2 calculations are used by the NRC for planning purposes, for cost-benefit analyses, and in level-3 probabilistic risk analyses (PRAs). The MACCS2 ATD model has been criticized as being overly simplistic, even for its purposes. The justification for its use has been

283

Extended, Continuous Pt Nanostructures in Thick, Dispersed Electrodes  

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

Bryan Pivovar (PI) Bryan Pivovar (PI) National Renewable Energy Laboratory Sept 30, 2009 Extended, Continuous Pt Nanostructures in Thick, Dispersed Electrodes This presentation does not contain any proprietary, confidential, or otherwise restricted information Objectives To assist the DOE Fuel Cell Technologies (FCT) Program in meeting cost, durability, and performance targets in the areas of Electrocatalysts and MEAs. Approach: Novel Synthesis and Electrode Studies Pt nanotubes (UC-R) Pt coated carbon nanotubes Synthesis of novel catalysts based on extended surfaces due to 3M's demonstrated improvements in specific activity and durability using similar systems. Electrode architecture design, based on novel catalyst structures that allow thick (~10 µm), dispersed electrodes to

284

AIR DISPERSION MODELING AT THE WASTE ISOLATION PILOT PLANT  

SciTech Connect

One concern at the Waste Isolation Pilot Plant (WIPP) is the amount of alpha-emitting radionuclides or hazardous chemicals that can become airborne at the facility and reach the Exclusive Use Area boundary as the result of a release from the Waste Handling Building (WHB) or from the underground during waste emplacement operations. The WIPP Safety Analysis Report (SAR), WIPP RCRA Permit, and WIPP Emergency Preparedness Hazards Assessments include air dispersion calculations to address this issue. Meteorological conditions at the WIPP facility will dictate direction, speed, and dilution of a contaminant plume of respirable material due to chronic releases or during an accident. Due to the paucity of meteorological information at the WIPP site prior to September 1996, the Department of Energy (DOE) reports had to rely largely on unqualified climatic data from the site and neighboring Carlsbad, which is situated approximately 40 km (26 miles) to the west of the site. This report examines the validity of the DOE air dispersion calculations using new meteorological data measured and collected at the WIPP site since September 1996. The air dispersion calculations in this report include both chronic and acute releases. Chronic release calculations were conducted with the EPA-approved code, CAP88PC and the calculations showed that in order for a violation of 40 CFR61 (NESHAPS) to occur, approximately 15 mCi/yr of 239Pu would have to be released from the exhaust stack or from the WHB. This is an extremely high value. Hence, it is unlikely that NESHAPS would be violated. A site-specific air dispersion coefficient was evaluated for comparison with that used in acute dose calculations. The calculations presented in Section 3.2 and 3.3 show that one could expect a slightly less dispersive plume (larger air dispersion coefficient) given greater confidence in the meteorological data, i.e. 95% worst case meteorological conditions. Calculations show that dispersion will decrease slightly if a more stable wind class is assumed, where very little vertical mixing occurs. It is recommended that previous reports which used fixed values for calculating the air dispersion coefficient be updated to reflect the new meteorological data, such as the WIPP Safety Analysis Report and the WIPP Emergency Preparedness Hazards Assessment. It is also recommended that uncertainty be incorporated into the calculations so that a more meaningful assessment of risk during accidents can be achieved.

Rucker, D.F.

2000-08-01T23:59:59.000Z

285

Alcohol Dispersions of Calcium Hydroxide Nanoparticles for Stone Conservation  

Science Journals Connector (OSTI)

Alcohol dispersions of Ca(OH)2 nanoparticles, the so-called nanolimes, are emerging as an effective conservation material for the consolidation of stone, mortars, and plasters present in old masonry and/or mural paintings. ... Considering that past studies on the consolidation of stone using nanolime dispersions have focused on carbonate stones such as limestones, here we test the ability of these treatments to consolidate silicate stones. ... DArmada, P.; Hirst, E.Nano-lime for consolidation of plaster and stone J. Architect. ...

Carlos Rodriguez-Navarro; Amelia Suzuki; Encarnacion Ruiz-Agudo

2013-08-06T23:59:59.000Z

286

Scattering approach to dispersive atom-surface interactions  

SciTech Connect

We develop the scattering approach for the dispersive force on a ground state atom on top of a corrugated surface. We present explicit results to first order in the corrugation amplitude. A variety of analytical results are derived in different limiting cases, including the van der Waals and Casimir-Polder regimes. We compute numerically the exact first-order dispersive potential for arbitrary separation distances and corrugation wavelengths, for a Rubidium atom on top of a silicon or gold corrugated surface. We consider in detail the correction to the proximity force approximation, and present a very simple approximation algorithm for computing the potential.

Dalvit, Diego [Los Alamos National Laboratory; Messina, Riccardo [LAB KASTLER BROSSEL; Maia Neto, Paulo [INSTITUTO DE FISICA UFRJ; Lambrecht, Astrid [LAB KASTLER BROSSEL; Reynaud, Serge [LAB KASTLER BROSSEL

2009-01-01T23:59:59.000Z

287

Geometric Doppler Effect: Spin-Split Dispersion of Thermal Radiation  

Science Journals Connector (OSTI)

A geometric Doppler effect manifested by a spin-split dispersion relation of thermal radiation is observed. A spin-dependent dispersion splitting was obtained in a structure consisting of a coupled thermal antenna array. The effect is due to a spin-orbit interaction resulting from the dynamics of the surface waves propagating along the structure whose local anisotropy axis is rotated in space. The observation of the spin-symmetry breaking in thermal radiation may be utilized for manipulation of spontaneous or stimulated emission.

Nir Dahan; Yuri Gorodetski; Kobi Frischwasser; Vladimir Kleiner; Erez Hasman

2010-09-21T23:59:59.000Z

288

The dispersion relation of pion in nuclear matter  

E-Print Network (OSTI)

We put forward a formalism to calculate the relativistic particle - hole and delta - hole excitation polarization insertion for pion propagator by using the particle - hole - antiparticle representation of nucleon and delta propagators in nuclear matter. The real and the imaginary part of the polarization insertion and the dispersion relation for pion propagator are calculated numerically. We find that the short range correlation enhances the delta - hole excitation but suppresses the particle - hole excitation, it also suppresses the pion condensation. We find that the effect of the short range correlation on the pion dispersion relation depends very much on the form of the short range correlation and the parameters involved.

Liang-gang Liu; Masahiro Nakano

1997-09-09T23:59:59.000Z

289

Effects of sintering additives on dispersion properties of Al2O3 slurry containing polyacrylic acid dispersant  

Science Journals Connector (OSTI)

The effects of sintering aid adsorption on the dispersion properties of aluminum oxide slurries were investigated. We considered Al2O3 slurry without additives and Al2O3 slurry with a Mg additive with 0.1mass% in oxide equivalent as a sintering aid. In this study, we evaluated the adsorption isotherm of polyacrylic acid (PAA) onto Al2O3 and the dispersion degree of Al2O3 slurries in sedimentation tests under gravity. The adsorption isotherm featured a characteristic adsorption isothermal line with a maximum value when Mg additive was present in Al2O3. In addition, the packing fractions did not correspond to the apparent viscosity. However, in slurry that was allowed to settle for several days, both of them agreed.Therefore, the disagreement between the packing fraction and the apparent viscosity immediately after preparation arose from changes of the dispersion state, such as the decrease of the distance between particles with time.

Hiromi Ohtsuka; Hidetoshi Mizutani; Satoshi IIO; Kazuki Asai; Takayoshi Kiguchi; Hiroshi Satone; Takamasa Mori; Junichiro Tsubaki

2011-01-01T23:59:59.000Z

290

Identification of parameters in building concentration dispersion model  

E-Print Network (OSTI)

1 Identification of parameters in building concentration dispersion model D. Calogine*,1 , H. Boyer, 17, 11, 20] use macroscopic models, which represent room or entire building by a single node Abstract The aim of this work is to simulate the pollutants transport in buildings. Focusing mainly

Paris-Sud XI, Université de

291

Metallophilic interactions from dispersion-corrected density-functional theory  

SciTech Connect

In this article, we present the first comprehensive study of metallophilic (aurophilic) interactions using dispersion-corrected density-functional theory. Dispersion interactions (an essential component of metallophilicity) are treated using the exchange-hole dipole moment (XDM) model. By comparing against coupled-cluster benchmark calculations on simple dimers, we show that LC-?PBE-XDM is a viable functional to study interactions between closed-shell transition metals and that it performs uniformly better than second-order Mller-Plesset theory, the basic computational technique used in previous works. We apply LC-?PBE-XDM to address several open questions regarding metallophilicity, such as the interplay between dispersion and relativistic effects, the interaction strength along group 11, the additivity of homo- and hetero-metallophilic effects, the stability of [E(AuPH{sub 3}){sub 4}]{sup +} cations (E = N, P, As, Sb), and the role of metallophilic effects in crystal packing. We find that relativistic effects explain the prevalence of aurophilicity not by stabilizing metal-metal contacts, but by preventing gold from forming ionic structures involving bridge anions (which are otherwise common for Ag and Cu) as a result of the increased electron affinity of the metal. Dispersion effects are less important than previously assumed and their stabilization contribution is relatively independent of the metal.

Otero-de-la-Roza, Alberto, E-mail: aoterodelaroza@ucmerced.edu; Mallory, Joel D.; Johnson, Erin R., E-mail: ejohnson29@ucmerced.edu [Chemistry and Chemical Biology, School of Natural Sciences, University of California, Merced, 5200 North Lake Road, Merced, California 95343 (United States)

2014-05-14T23:59:59.000Z

292

Dispersion diagrams of chromospheric MHD waves in a 2D  

E-Print Network (OSTI)

Dispersion diagrams of chromospheric MHD waves in a 2D simulation Chris Dove The Evergreen State MHD code models dynamics · Methods to get clearer pictures · Analysis of results · Patterns/NCAR, Thursday 29 July 2004 A diagram of the Sun, courtesy NASA sohowww

Zita, E.J.

293

A new microturbine-based dispersed generation scheme  

Science Journals Connector (OSTI)

Almost all of the commercial microturbine-based dispersed generation systems today are composed of a high-speed permanent-magnet alternator and a diode rectifier-PWM inverter pair. A dispersed generation scheme ?? made up of a microturbine, an induction generator, and a diode rectifier-PWM inverter pair ?? is introduced in this paper. A complete model for the self-excited squirrel-cage induction generator is developed and used to study the steady-state and transient behaviours of the overall system. The power delivered to the grid is controlled by an injected current control loop. The input/output power balance is maintained by regulating the DC-bus voltage using a new method based on the torque control of microturbine. Analysis shows that the Simulink simulation results of induction generator is a viable substitute for permanent magnet alternator in microturbine-based dispersed generation systems due to its low cost, low maintenance, rugged structure, and slack between rotor speed and terminal frequency, which isolates the transients of the grid from the generator system when the DC-bus capacitor size is reduced. Both schemes have been simulated and the simulation results are presented to compare the proposed scheme based on induction generator with the present microturbine-based dispersed generation scheme based on synchronous machine.

Afshin Majd; Mehrdad Kazerani

2007-01-01T23:59:59.000Z

294

A Tracer Investigation oftheAtmosph^c Dispersion  

E-Print Network (OSTI)

Laboratory Erik Lyck Air Pollution Laboratory National Agency of Environmental Protection Abstract. Mining at Kvanefjeld, Greenland, will result in releases of air polluting gases. In order to measure the dilution and a sea-breeze. INIS-descriptors: AIR POLLUTION; DILUTION; DISPERSION; ENVIRONMENTAL IMPACTS; GASES

295

Sol State Behavior and Gelation Kinetics in Mixed Nanoclay Dispersions  

Science Journals Connector (OSTI)

This chapter investigates sol and gel state behavior, in aqueous salt free dispersions, of clays Laponite (L) and Na Montmorillonite (MMT) at various mixing ratios (L:MMT=r=1:0.5, 1:1 and 1:2). Percolation...

Ravi Kumar Pujala

2014-01-01T23:59:59.000Z

296

Fuel dispersal modeling for aircraft-runway impact scenarios  

SciTech Connect

A fuel dispersal model for C-141 transport accidents was developed for the Defense Nuclear Agency`s Fuel Fire Technology Base Program to support Weapon System Safety Assessments. The spectrum of accidents resulting from aircraft impact on a runway was divided into three fuel dispersal regimes: low, intermediate, and high-velocity impact. Sufficient data existed in the accident, crash test, and fuel-filled bomb literature to support development of a qualitative framework for dispersal models, but not quantitative models for all regimes. Therefore, a test series at intermediate scale was conducted to generate data on which to base the model for the high-velocity regime. Tests were conducted over an impact velocity range from 12 m/s to 91 m/s and angles of impact from 22.5{degrees} to 67.5{degrees}. Dependent variables were area covered by dispersed fuel, amount of mass in that area, and location of the area relative to the impact line. Test results showed that no liquid pooling occurred for impact velocities greater than 61 m/s, independent of the angle of impact. Some pooling did occur at lower velocities, but in no test was the liquid-layer thickness greater than 5.25 mm.

Tieszen, S.R.

1995-11-01T23:59:59.000Z

297

Single atom identification by energy dispersive x-ray spectroscopy  

SciTech Connect

Using aberration-corrected scanning transmission electron microscope and energy dispersive x-ray spectroscopy, single, isolated impurity atoms of silicon and platinum in monolayer and multilayer graphene are identified. Simultaneously acquired electron energy loss spectra confirm the elemental identification. Contamination difficulties are overcome by employing near-UHV sample conditions. Signal intensities agree within a factor of two with standardless estimates.

Lovejoy, T. C.; Dellby, N.; Krivanek, O. L. [Nion, 1102 8th St., Kirkland, Washington 98033 (United States); Ramasse, Q. M. [SuperSTEM Laboratory, STFC Daresbury, Keckwick Lane, Daresbury WA4 4AD (United Kingdom); Falke, M.; Kaeppel, A.; Terborg, R. [Bruker Nano GmbH, Schwarzschildstr. 12, 12489 Berlin (Germany); Zan, R. [School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom)

2012-04-09T23:59:59.000Z

298

FINITE VOLUME METHODS FOR UNIDIRECTIONAL DISPERSIVE WAVE MODELS  

E-Print Network (OSTI)

], the BBM equation [4] and Boussinesq systems [11, 40, 8]. All these models assume the wave to be weakly to dispersive unidi- rectional water wave propagation in one space dimension. In particular we consider a KdV-BBM differential equation modeling unidirectional wave propagation. Specifically, we consider the KdV-BBM equation

Paris-Sud XI, Université de

299

ccsd00000617 Phonon dispersion in the 1-layer cuprate  

E-Print Network (OSTI)

neutron scattering. PACS numbers: 74.72.Jt, 74.25.Kc, 78.70.Ck x Present address: Physique des Milieux-ray scattering (IXS). The experimental phonon dispersion and the dynamical structure factor are compared for volumes smaller then 0.1 mm 3 (see Bertinotti et al 1997). Such a size is insu?cient for inelastic neutron

300

POLLEN DISPERSAL AND DEPOSITION ON THE QUELCCAYA ICE CAp, PERU  

E-Print Network (OSTI)

POLLEN DISPERSAL AND DEPOSITION ON THE QUELCCAYA ICE CAp, PERU Carl A. Reese and Kam-biu Liu: The relatively young science of tropical ice-core palynology has proven effective in the study of paleoenvironments by its ability to produce long-term and high- resolution paleoclimatic data. However, no studies

Liu, Kam-biu

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


301

Electrical properties of dispersions of graphene in mineral oil  

SciTech Connect

Dispersions of graphene in mineral oil have been prepared and electrical conductivity and permittivity have been measured. The direct current (DC) conductivity of the dispersions depends on the surface characteristics of the graphene platelets and followed a percolation model with a percolation threshold ranging from 0.05 to 0.1?wt. %. The difference in DC conductivities can be attributed to different states of aggregation of the graphene platelets and to the inter-particle electron transfer, which is affected by the surface radicals. The frequency-dependent conductivity (?(?)) and permittivity (?(?)) were also measured. The conductivity of dispersions with particle contents much greater than the percolation threshold remains constant and equal to the DC conductivity at low frequencies ? with and followed a power-law ?(?)???{sup s} dependence at very high frequencies with s?0.9. For dispersions with graphene concentration near the percolation threshold, a third regime was displayed at intermediate frequencies indicative of interfacial polarization consistent with Maxwell-Wagner effect typically observed in mixtures of two (or more) phases with very distinct electrical and dielectric properties.

Monteiro, O. R., E-mail: othon.monteiro@bakerhughes.com [Baker Hughes, 14990 Yorktown Plaza Dr., Houston, Texas 77040 (United States)

2014-02-03T23:59:59.000Z

302

Deformed dispersion relations and the degree of coherence function  

E-Print Network (OSTI)

The analysis of the modifications that the presence of a deformed dispersion relation entails in the roots of the so--called degree of coherence function, for a beam embodying two different frequencies and moving in a Michelson interferometer, is carried out. The conditions to be satisfied, in order to detect this kind of quantum gravity effect, are also obtained.

A. Camacho; A. Macias

2006-08-16T23:59:59.000Z

303

A Field Experiment to Validate Atmospheric Dispersion and  

E-Print Network (OSTI)

Rise-R.495 A Field Experiment to Validate Atmospheric Dispersion and Dose Models S. P. Nielsen* S Roskilde, Denmark May 1986 #12;RIS?-R-495 DOUBLE TRACER EXPERIMENTS TO EVALUATE ATMOSPHERIC TRANSPORT Pollution Laboratory, Risø National Laboratory, DK-4000 Roskilde, Denmark Abstract. Two tracers

304

Design and analysis of a high heat load pin-post monochromator crystal with an integral water manifold  

SciTech Connect

Conventional minichannel water cooling geometry will not perform satisfactorily for x-radiation from a wiggler source at the Advanced Photon Source. For closed-gap wiggler operation, cryogenic silicon appears to be the only option for crystals in Bragg-Bragg geometry. For operation of the wiggler at more modest critical energies ({lt}17 keV), the first crystal can be cooled by a pin-post cooling scheme, using water at room temperature as a coolant. In order to limit the water consumption to 4 gpm and hence the risk of introducing vibrations to the crystal, the intensely cooled area of the crystal was matched to the footprint of the beam, leaving a less cooled area of the crystal subject to survival in a missteered beam but not to perform as a monochromator. The manifold design avoids large areas of high water pressure that would bow the crystal. We present here the design of a pin-post monochromator consisting of a four-layer silicon manifold system and an integrally bonded 39{percent} nickel-iron alloy base plate. A transparent prototype of the design will be exhibited. Fabrication techniques and design advantages will be discussed. {copyright} {ital 1996 American Institute of Physics.}

Schildkamp, W. [Consortium for Advanced Radiation Sources, University of Chicago, 5640 S. Ellis Ave., Chicago, IL 60637 (United States)] [Consortium for Advanced Radiation Sources, University of Chicago, 5640 S. Ellis Ave., Chicago, IL 60637 (United States); Tonnessen, T. [Rocketdyne Albuquerque Operations, 2511 C. Broadbent Parkway, N.E., Albuquerque, NM 87107 (United States)] [Rocketdyne Albuquerque Operations, 2511 C. Broadbent Parkway, N.E., Albuquerque, NM 87107 (United States)

1996-09-01T23:59:59.000Z

305

Dispersion of concentrated aqueous neodymiayttriaalumina mixture with ammonium poly(acrylic acid) as dispersant  

Science Journals Connector (OSTI)

A stable aqueous slurry using ammonium polyacrylic acid polyelectrolyte as dispersant and a neodymiayttriaalumina mixture was prepared as the starting powder. The effect of the polyelectrolyte concentration and the pH of the slurry on the stability of the suspension is studied, and the optimal pH value and the amount of dispersant needed to obtain a stable slurry were determined. Highly consistent slurries with optimal pH and dispersant concentration were prepared by ball milling. The rheological behavior of the slip with different solid loading (4858wt.%) has been studied by measuring the viscosity and shear stress as a function of shear rate. Slip with solid loadings of 53wt.% shows near-Newtonian behavior but becomes non-Newtonian with typical shear-thinning behavior above this solid loading value. The density and microstructure of the cast product bears a direct relationship to the state of the slip induced by variation of the pH and the concentration of the dispersant as well as by solid loading. Transparent Nd:YAG ceramics were obtained by sintering of compacts prepared from optimized slurries at 1750C in vacuum.

Yaohui Lv; Wei Zhang; Jie Tan; Yuanhua Sang; Haiming Qin; Jinlian Hu; Liuniu Tong; Hong Liu; Jiyang Wang; Robert I Boughton

2011-01-01T23:59:59.000Z

306

Heat transfer to impacting drops and post critical heat flux dispersed flow  

E-Print Network (OSTI)

Heat transfer to drops impacting on a hot surface is examined in context of dispersions of flowing, boiling fluids. The liquid contribution to heat transfer from a hot tube to a two-phase dispersion is formulated in terms ...

Kendall, Gail E.

1978-01-01T23:59:59.000Z

307

Stabilization of Hydrophobic Colloidal Dispersions in Water with Amphiphilic Polymers: Application to Integral  

E-Print Network (OSTI)

amphiphilic polymers ("amphipols"). These polymers, derived from poly(acrylic acid), adsorb onto the particleStabilization of Hydrophobic Colloidal Dispersions in Water with Amphiphilic Polymers: Application dispersions of highly hydrophobic colloidal particlesshere three integral membrane proteins of nanometric

308

Dispersion of Small Ceramic Particles (Al2O3) with Azotobacter vinelandii  

Science Journals Connector (OSTI)

...between particles, may be used as a dispersant. Currently, synthetic polymers from petrochemi- cals, such as polymethacrylic acid (PMAA) and polyacrylic acid (PAA), are used as dispersants (5, 6). However, com- mercial PMAA...

Tao Ren; Nancy B. Pellerin; Gordon L. Graff; Ilhan A. Aksay; James T. Staley

1992-09-01T23:59:59.000Z

309

Energy Dispersed Large Data Wave Maps in 2+1 Dimensions  

E-Print Network (OSTI)

of Finite S Norm Wave-Maps and Energy Dispersion 10.1renormalization of large energy wave maps. In: Journes of Finite S Norm Wave-Maps and Energy Dispersion In this

Sterbenz, Jacob; Tataru, Daniel

2010-01-01T23:59:59.000Z

310

Critique of Burnett-Frind dispersion tensor for axisymmetric porous media  

SciTech Connect

This technical note provides a critique of the Burnett and Frind (1987) dispersion tensor for porous media with axial symmetry based on a previous publication by the authors (Lichtner et aI., 2002). In this work a new approach is used based on unit eigenvectors which simplifies the analysis. It is demonstrated that the Burnett-Frind dispersion tensor, although acceptable for small values of the vertical velocity, produces the incorrect behavior for both longitudinal and transverse dispersivity as the flow velocity varies from parallel to perpendicular to the axis of symmetry. A new form of the dispersion tensor is derived for axially symmetric porous media involving four dispersivity coefficients corresponding to longitudinal and transverse dispersion in horizontal and vertical directions, defined as perpendicular and parallel to the axis of symmetry, respectively. This new dispersion tensor corrects two fundamental problems with the dispersion tensor proposed by Burnett and Frind (1987) for axial symmetric media.

Lichtner, Peter C [Los Alamos National Laboratory; Kelkar, Sharad [Los Alamos National Laboratory; Robinson, Bruce A [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

311

Using anisotropic dispersive materials for high-precision determination of the energy of charged particles  

Science Journals Connector (OSTI)

Vavilov-Cherenkov radiation (VCR) generated by a charged particle moving in a waveguide filled with an anisotropic dispersive material is considered. It is shown that, for a certain character of dispersion and...

A. V. Tyukhtin

2009-03-01T23:59:59.000Z

312

A microcomputer stochastic simulation model of seed dispersion of Melaleuca quinquenervia  

Science Journals Connector (OSTI)

A model simulates the pattern of wind-driven Melaleuca seed dispersion under normal south Florida weather conditions and a hurricane situation. Major factors determining the dispersion pattern are seed terminal velocity, height ...

Peter B. Schroeder; Joan A. Browder

1980-01-01T23:59:59.000Z

313

High temperature phonon dispersion in graphene using classical molecular dynamics  

SciTech Connect

Phonon dispersion and phonon density of states of graphene are calculated using classical molecular dynamics simulations. In this method, the dynamical matrix is constructed based on linear response theory by computing the displacement of atoms during the simulations. The computed phonon dispersions show excellent agreement with experiments. The simulations are done in both NVT and NPT ensembles at 300 K and found that the LO/TO modes are getting hardened at the ? point. The NPT ensemble simulations capture the anharmonicity of the crystal accurately and the hardening of LO/TO modes is more pronounced. We also found that at 300 K the C-C bond length reduces below the equilibrium value and the ZA bending mode frequency becomes imaginary close to ? along K-? direction, which indicates instability of the flat 2D graphene sheets.

Anees, P., E-mail: anees@igcar.gov.in; Panigrahi, B. K. [Materials Physics Division, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102 (India); Valsakumar, M. C., E-mail: anees@igcar.gov.in [School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad-500046 (India)

2014-04-24T23:59:59.000Z

314

Nematic droplets in aqueous dispersions of carbon nanotubes  

Science Journals Connector (OSTI)

Aqueous dispersions of exfoliated, bile-salt stabilized single-wall carbon nanotubes exhibit a first order transition to a nematic liquid-crystalline phase. The nematic phase presents itself in the form of micron-sized nematic droplets also known as tactoids, freely floating in the isotropic host dispersion. The nematic droplets are spindle shaped and have an aspect ratio of about four, irrespective of their size. We attribute this to a director field that is uniform rather than bipolar, which is confirmed by polarization microscopy. It follows that the ratio of the anchoring strength and the surface tension must be about four, which is quite larger than predicted theoretically but in line with earlier observations of bipolar tactoids. From the scatter in the data we deduce that the surface tension of the coexisting isotropic and nematic phases must be extremely low, that is, of the order of nN/m.

Nicolas Puech; Eric Grelet; Philippe Poulin; Christophe Blanc; Paul van der Schoot

2010-08-24T23:59:59.000Z

315

Mirror force induced wave dispersion in Alfvn waves  

SciTech Connect

Recent hybrid MHD-kinetic electron simulations of global scale standing shear Alfvn waves along the Earth's closed dipolar magnetic field lines show that the upward parallel current region within these waves saturates and broadens perpendicular to the ambient magnetic field and that this broadening increases with the electron temperature. Using resistive MHD simulations, with a parallel Ohm's law derived from the linear Knight relation (which expresses the current-voltage relationship along an auroral field line), we explore the nature of this broadening in the context of the increased perpendicular Poynting flux resulting from the increased parallel electric field associated with mirror force effects. This increased Poynting flux facilitates wave energy dispersion across field lines which in-turn allows for electron acceleration to carry the field aligned current on adjacent field lines. This mirror force driven dispersion can dominate over that associated with electron inertial effects for global scale waves.

Damiano, P. A.; Johnson, J. R. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451 (United States)] [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451 (United States)

2013-06-15T23:59:59.000Z

316

FINITE VOLUME METHODS FOR UNIDIRECTIONAL DISPERSIVE WAVE MODELS  

E-Print Network (OSTI)

V95], the BBM equation [BBM72] and Boussinesq systems [Bou72, Per67, BCS02]. All these models as- sume to dispersive unidi- rectional water wave propagation in one space dimension. In particular we consider a KdV-BBM the KdV-BBM equation in its general form: ut + ux + uux - uxxt + uxxx = 0, (1.1) for x R, t > 0

Paris-Sud XI, Université de

317

Ris-M-2751 X-Ray Energy Dispersive  

E-Print Network (OSTI)

(PHOT) k«V 50 Risø National Laboratory, DK-4000 Roskilde, Denmark October 1988 #12;Ris*-M-2751 X-ray energy is impinging on the sample (Fig. lb). Its wavelength (photon energy) is in the course of measurements changedm ii. S Risø-M-2751 X-Ray Energy Dispersive Diffraction Lecture Notes Bronislaw Buras BaKo 30 40 E

318

Global regularity of critical Schrdinger maps: subthreshold dispersed energy  

E-Print Network (OSTI)

We consider the energy-critical Schroedinger map initial value problem with smooth initial data from R^2 into the sphere S^2. Given sufficiently energy-dispersed data with subthreshold energy, we prove that the system admits a unique global smooth solution. This improves earlier analogous conditional results. The key behind this improvement lies in exploiting estimates on the commutator of the Schroedinger map and harmonic map heat flows.

Paul Smith

2012-12-19T23:59:59.000Z

319

Wave front dispersion due to fluid-structure interaction in long liquid-filled pipelines  

E-Print Network (OSTI)

and dispersion than the corresponding standard water-hammer calculations. The reason is that a number of effects

Eindhoven, Technische Universiteit

320

A Dispersive Treatment of $K_{\\ell4}$ Decays  

E-Print Network (OSTI)

$K_{\\ell4}$ decays offer several reasons of interest: they allow an accurate measurement of $\\pi\\pi$-scattering lengths; they provide the best source for the determination of some low-energy constants of ChPT; one form factor is directly related to the chiral anomaly, which can be measured here. We present a dispersive treatment of $K_{\\ell4}$ decays that provides a resummation of $\\pi\\pi$- and $K\\pi$-rescattering effects. The free parameters of the dispersion relation are fitted to the data of the high-statistics experiments E865 and NA48/2. The matching to ChPT at NLO and NNLO enables us to determine the LECs $L_1^r$, $L_2^r$ and $L_3^r$. With recently published data from NA48/2, the LEC $L_9^r$ can be determined as well. In contrast to a pure chiral treatment, the dispersion relation describes the observed curvature of one of the form factors, which we understand as a rescattering effect beyond NNLO.

Colangelo, Gilberto; Stoffer, Peter

2015-01-01T23:59:59.000Z

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


321

1-D profiling using highly dispersive guided waves  

SciTech Connect

Corrosion is one of the industries major issues regarding the integrity of assets. Currently, inspections are conducted at regular intervals to ensure a sufficient integrity level of these assets. Cost reduction while maintaining a high level of reliability and safety of installations is a major challenge. There are many situations where the actual defect location is not accessible, e.g., a pipe support or a partially buried pipe. Guided wave tomography has been developed to reconstruct the wall thickness of steel pipes. In case of bottom of the line corrosion, i.e., a single corrosion pit, a simpler approach may be followed. Data is collected in a pitch-catch configuration at the 12 o'clock position using highly dispersive guided waves. After dispersion correction the data collapses to a short pulse, any residual dispersion indicates wall loss. The phase spectrum is used to invert for the wall thickness profile in the circumferential direction, assuming a Gaussian defect profile. The approach is evaluated on numerically simulated and on measured data. The method is intended for rapid, semi-quantitative screening of pipes.

Volker, Arno; Zon, Tim van [TNO, Stieltjesweg 1, P.O. box 155 2600 AD Delft (Netherlands)

2014-02-18T23:59:59.000Z

322

Dispersion cancellation with phase-sensitive Gaussian-state light  

SciTech Connect

Franson's paradigm for nonlocal dispersion cancellation [J. D. Franson, Phys. Rev. A 45, 3126 (1992)] is studied using two kinds of jointly Gaussian-state signal and reference beams with phase-sensitive cross correlations. The first joint signal-reference state is nonclassical, with a phase-sensitive cross correlation that is at the ultimate quantum-mechanical limit. It models the outputs obtained from continuous-wave spontaneous parametric down-conversion. The second joint signal-reference state is classical--it has a proper P representation--with a phase-sensitive cross correlation that is at the limit set by classical physics. Using these states we show that a version of Franson's nonlocal dispersion cancellation configuration has essentially identical quantum and classical explanations except for the contrast obtained, which is much higher in the quantum case than it is in the classical case. This work bears on Franson's recent article [J. D. Franson, Phys. Rev. A 80, 032119 (2009)], which asserts that there is no classical explanation for all the features seen in quantum nonlocal dispersion cancellation.

Shapiro, Jeffrey H. [Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2010-02-15T23:59:59.000Z

323

Implications of ASOS winds on regulatory dispersion modeling applications  

SciTech Connect

With the advent of the Automated Surface Observing System (ASOS) throughout the United States during the 1990`s, an unprecedented level of meteorological data is now available. For the first time, observations of standard meteorological variables are available on a minute-by-minute basis. As a result, ASOS has tremendously increased the real-time data available for both weather forecasting and aviation purposes. However, the affect of the ASOS method of data collection on the dispersion modeling community is less clear. Because the hourly data now being reported at most stations across the country are being gathered in a fundamentally different way than previously, it is prudent to examine the differences between hourly meteorological observations gathered before and after ASOS. This paper scrutinizes wind speed and direction data gathered at Baltimore-Washington International Airport and Washington Dulles International Airport and quantifies the differences. Wind data are critical in determining the transport and dispersion of pollutant plumes. Relationships between manually gathered wind data and ASOS wind data are examined. Finally, potential ramifications on dispersion modeling applications are discussed.

Jones, W.B.; Brower, R.P. [Versar, Inc., Columbia, MD (United States)

1998-12-31T23:59:59.000Z

324

Dispersed slurry catalysts for hydroconversion of carbonaceous materials  

SciTech Connect

Dispersed slurry catalysts, based upon the in situ sulfided forms of transition metals such as iron and molybdenum, have been developed and successfully employed in the multi-stage hydroconversion of various carbonaceous materials including coal, heavy petroleum resid, waste plastics, and different combinations of these feedstocks. For example, using HTI`s proprietary iron-based catalyst and commercial Molyvan-A additive, over 95% maf coal conversion has been obtained accompanied by over 90% maf conversion of 524{degrees}C+ residuum and over 65% maf yield of C{sub 4}-524{degrees}C distillate yield in a fully back-mixed high pressure reaction system. The use of an in-fine fixed-bed hydrotreater in such a hydroconversion process that relies only on dispersed slurry catalysts for conversion allows to selectively upgrade the light distillate products (IBP-400{degrees}C) from the process resulting in premium quality naphtha and mid-distillate products with less than 10 ppm nitrogen, an FUC ratio of 1.9, and about 20 ppm sulfur. The use of dispersed catalyst for such hydroconversion processes has a significant positive impact (as much as 20% cost potential reduction) on the process economics because the reactor throughput can be increased by as much as 70 % while maintaining the equivalent residence time and the cost associated with the expensive high pressure catalyst addition/withdrawal system, used for supported extrudate catalyst, and that associated with expensive ebullating pumps can be reduced or eliminated completely.

Lee, L.K.; Pradhan, V.R.; Popper, G.; Comolli, A.G. [Hydrocarbon Technologies, Inc., Lawrenceville, NJ (United States)

1996-12-31T23:59:59.000Z

325

On the limiting behavior of the Brown-York quasi-local mass in asymptotically hyperbolic manifolds  

E-Print Network (OSTI)

We show that the limit at infinity of the vector-valued Brown-York-type quasi-local mass along any coordinate exhaustion of an asymptotically hyperbolic $3$-manifold satisfying the relevant energy condition on the scalar curvature has the conjectured causal character. Our proof uses spinors and relies on a Witten-type formula expressing the asymptotic limit of this quasi-local mass as a bulk integral which manifestly has the right sign under the above assumptions. In the spirit of recent work by Hijazi, Montiel and Raulot, we also provide another proof of this result which uses the theory of boundary value problems for Dirac operators on compact domains to show that a certain quasi-local mass, which converges to the Brown-York mass in the asymptotic limit, has the expected causal character under suitable geometric assumptions.

Ezequiel Barbosa; Levi Lopes de Lima; Frederico Giro

2014-07-02T23:59:59.000Z

326

The spatial, temporal, and configurational characteristics of geographic dispersion in teams  

Science Journals Connector (OSTI)

As organizations operate across greater distances, scholars are increasingly interested in the work of geographically dispersed teams and the technologies that they use to communicate and coordinate their work. However, research has generally not specified ... Keywords: configuration, dispersion, distance, geographically dispersed teams, technology use, virtual teams

Michael Boyer O'Leary; Jonathon N. Cummings

2007-09-01T23:59:59.000Z

327

Linear wave dispersion laws in unmagnetized relativistic plasma: Analytical and numerical results  

E-Print Network (OSTI)

cases sufficient for describing the wave motion. The power of these dispersion laws residesLinear wave dispersion laws in unmagnetized relativistic plasma: Analytical and numerical results, SE-751 21 Uppsala, Sweden Received 22 August 2000; accepted 30 January 2001 In this paper dispersion

328

Microcalorimeter-type energy dispersive X-ray spectrometer for a transmission electron microscope  

Science Journals Connector (OSTI)

......Microscopy (1986) New York: Plenum Press. 4...Garratt-Reed A J , Bell D C. Energy-Dispersive X-ray...Microscopy (1996) New York: Plenum Press. 19...Microcalorimeter-type energy dispersive X-ray...electron microscope. | A new energy dispersive......

Toru Hara; Keiichi Tanaka; Keisuke Maehata; Kazuhisa Mitsuda; Noriko Y. Yamasaki; Mitsuaki Ohsaki; Katsuaki Watanabe; Xiuzhen Yu; Takuji Ito; Yoshihiro Yamanaka

2010-02-01T23:59:59.000Z

329

Support vector machine approach for longitudinal dispersion coefficients in natural streams  

Science Journals Connector (OSTI)

This paper presents the support vector machine approach to predict the longitudinal dispersion coefficients in natural rivers. Collected published data from the literature for the dispersion coefficient for wide range of flow conditions are used for ... Keywords: Dispersion, Rivers, Streams, Support vector machine

H. Md. Azamathulla; Fu-Chun Wu

2011-03-01T23:59:59.000Z

330

Sex-biased dispersal in sperm whales: contrasting mitochondrial and nuclear genetic  

E-Print Network (OSTI)

Sex-biased dispersal in sperm whales: contrasting mitochondrial and nuclear genetic structure mammals is characterized by female philopatry and male dispersal. Such sex-biased dispersal can causeDNA) and the bi-parental nuclear genome. Here we report on the global genetic structure of oceanic populations

Leimar, Olof

331

Population structure and dispersal in a patchy landscape: nuclear and mitochondrial markers reveal  

E-Print Network (OSTI)

Population structure and dispersal in a patchy landscape: nuclear and mitochondrial markers reveal that suggest limited dispersal, combined with area effects most likely caused by expansion from refugial­620. ADDITIONAL KEYWORDS: balancing selection ­ colour polymorphism ­ dispersal ­ disturbance ­ gene-flow ­ land

Gillespie, Rosemary

332

Creation of the model and implementation of the simulation of dispersion of air pollution in urban  

E-Print Network (OSTI)

Creation of the model and implementation of the simulation of dispersion of air pollution in urban..............................................................................................................1 1.2. Types of models of dispersion of air pollution was creation of the mathematical model and application of the simulation of dispersion of vehicular air

Bargiela, Andrzej

333

Breeding Dispersal and Nesting Behavior of Burrowing Owls Following Experimental Nest1 D. H. CATLIN1  

E-Print Network (OSTI)

Breeding Dispersal and Nesting Behavior of Burrowing Owls Following Experimental Nest1 Predation2 3 97331, dan.rosenberg@oregonstate.edu7 ABSTRACT8 Nest predation is considered a primary factor affecting the hypothesis that nest predation would10 increase dispersal probability, dispersal distance and the frequency

Rosenberg, Daniel K.

334

Dispersion modeling of selected \\{PAHs\\} in urban air: A new approach combining dispersion model with GIS and passive air sampling  

Science Journals Connector (OSTI)

Abstract This study introduces a new combined air concentration measurement and modeling approach that we propose can be useful in medium and long term air quality assessment. A dispersion study was carried out for four high molecular weight polycyclic aromatic hydrocarbons (PAHs) in an urban area with industrial, traffic and domestic heating sources. A geographic information system (GIS) was used both for processing of input data as well as visualization of the modeling results. The outcomes of the dispersion model were compared to the results of passive air sampling (PAS). Despite discrepancies between measured and modeled concentrations, an approach combining the two techniques is promising for future air quality assessment. Differences between measured and modeled concentrations, in particular when measured values exceed the modeled concentrations, are indicative of undocumented, sporadic pollutant sources. Thus, these differences can also be useful for assessing and refining emission inventories.

Ond?ej S?ka; Lisa Melymuk; Pavel ?upr; Alice Dvorsk; Jana Klnov

2014-01-01T23:59:59.000Z

335

Simultaneous Suppression of Third-Order Dispersion and Sideband Instability in Single-Channel Optical Fiber Transmission by Midway Optical Phase Conjugation Employing Higher Order Dispersion Management  

Science Journals Connector (OSTI)

In optical phase conjugation (OPC) systems, the third-order dispersion (TOD) of optical fibers and the nonlinear resonance at well-defined signal sideband frequencies called sideband...

Kaewplung, Pasu; Angkaew, Tuptim; Kikuchi, Kazuro

2003-01-01T23:59:59.000Z

336

Atmospheric Dispersion and Consequence Analysis at Sandia's TA-V Nuclear Facilities  

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

Atmospheric Dispersion and Atmospheric Dispersion and Consequence Analysis at Sandia's TA-V Nuclear Facilities Jim Dahl Manager, Nuclear Safety Analysis Sandia National Laboratories Office: 505-284-9067 Email: jjdahl@sandia.gov SAND2012-4478P Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. 2 Dispersion and Consequence Analysis at Sandia's TA-V Topics: * Site Characteristics * Dispersion Analysis Inputs - Meteorological Data - Stability Class - Dispersion Coefficients - Deposition Velocity

337

Improving dispersibility of hafnium diboride in aqueous media using polyacrylic acid and ammonium citrate  

Science Journals Connector (OSTI)

Abstract It has been well accepted that polyacrylic acid (PAA) is an effective dispersant for metal diborides (such as ZrB2) in aqueous media. However, when dispersing HfB2 powder, the dispersing effect is reduced significantly. In this work, a second dispersant, ammonium citrate, was used to resolve this problem. It was found that a PAAammonium citrate binary dispersant system could effectively enhance the zeta potential, increase the PAA adsorption content, and improve the stability of HfB2. The apparent viscosities of the suspensions were also investigated. Results showed that the PAAammonium citrate binary dispersant system was effective for improving the dispersion of HfB2 particles in aqueous media.

Gang Wang; Rujie He; Feng He

2014-01-01T23:59:59.000Z

338

Spatial Dispersion of Peering Clusters in the European Internet  

E-Print Network (OSTI)

section by analyzing the determinants of bilateral peering decisions. Finally, section 5 concludes. 2 Agglomeration in the Internet In one of the earliest contributions of the renewed debate on the geographical agglomeration of economic activity Krugman... .0136 Paris, France -0.03448 0.00762 0.23892 random RONIX -0.22 Bucharest, Romania -0.05 0.00881 -1.8113 dispersed TIX -0.0267 Zurich, Switzerland -0.02222 0.00157 -0.1141 random TOPIX -0.077 Torino, Italy -0.09091 0.00894 0.1466 random VIX 0.07147 Vienna...

D'Ignazio, Alessio; Giovannetti, Emanuele

2006-03-14T23:59:59.000Z

339

RADIONUCLIDE DISPERSION RATES BY AEOLIAN, FLUVIAL, AND POROUS MEDIA TRANSPORT  

SciTech Connect

Radionuclide transport was measured from high grade uranium ore boulders near the Nopal I Site, Chihuahua, Mexico. High grade uranium ore boulders were left behind after removal of a uranium ore stockpile at the Prior High Grade Stockpile (PHGS). During the 25 years when the boulder was present, radionuclides were released and transported by sheetflow during precipitation events, wind blown resuspension, and infiltration into the unsaturated zone. In this study, one of the boulders was removed, followed by grid sampling of the surrounding area. Measured gamma radiation levels in three dimensions were used to derive separate dispersion rates by the three transport mechanisms.

J. Walton; P. Goodell; C. Brashears; D. French; A. Kelts

2005-07-11T23:59:59.000Z

340

Kappa - Poincare dispersion relations and the black hole radiation  

E-Print Network (OSTI)

Following the methods developed by Corley and Jacobson, we consider qualitatively the issue of Hawking radiation in the case when the dispersion relation is dictated by quantum kappa-Poincare algebra. This relation corresponds to field equations that are non-local in time, and, depending on the sign of the parameter kappa, to sub- or superluminal signal propagation. We also derive the conserved inner product, that can be used to count modes, and therefore to obtain the spectrum of black hole radiation in this case.

A. Blaut; J. Kowalski-Glikman; D. Nowak-Szczepaniak

2001-08-28T23:59:59.000Z

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


341

Extracellular Proteins Limit the Dispersal of BiogenicNanoparticles  

SciTech Connect

High spatial-resolution secondaryion microprobespectrometry, synchrotron radiation Fourier-transform infraredspectroscopy and polyacrylamide gel analysis demonstrate the intimateassociation of proteins with spheroidal aggregates of biogenic zincsulfide nanocrystals, an example of extracellular biomineralization.Experiments involving synthetic ZnS nanoparticles and representativeamino acids indicate a driving role for cysteine in rapid nanoparticleaggregation. These findings suggest that microbially-derivedextracellular proteins can limit dispersal of nanoparticulatemetal-bearing phases, such as the mineral products of bioremediation,that may otherwise be transported away from their source by subsurfacefluid flow.

Moreau, John W.; Weber, Peter K.; Martin, Michael C.; Gilbert,Benjamin; Hutcheon, Ian D.; Banfield, Jillian F.

2007-04-27T23:59:59.000Z

342

Dispersion toughened ceramic composites and method for making same  

DOE Patents (OSTI)

Ceramic composites exhibiting increased fracture toughness are produced by the simultaneous codeposition of silicon carbide and titanium disilicide by chemical vapor deposition. A mixture of hydrogen, methyltrichlorosilane and titanium tetrachloride is introduced into a furnace containing a substrate such as graphite or silicon carbide. The thermal decomposition of the methyltrichlorosilane provides a silicon carbide matrix phase and the decomposition of the titanium tetrachloride provides a uniformly dispersed second phase of the intermetallic titanium disilicide within the matrix phase. The fracture toughness of the ceramic composite is in the range of about 6.5 to 7.0 MPa..sqrt..m which represents a significant increase over that of silicon carbide.

Stinton, D.P.; Lackey, W.J.; Lauf, R.J.

1984-09-28T23:59:59.000Z

343

Dispersion toughened ceramic composites and method for making same  

DOE Patents (OSTI)

Ceramic composites exhibiting increased fracture toughness are produced by the simultaneous codeposition of silicon carbide and titanium disilicide by chemical vapor deposition. A mixture of hydrogen, methyltrichlorosilane and titanium tetrachloride is introduced into a furnace containing a substrate such as graphite or silicon carbide. The thermal decomposition of the methyltrichlorosilane provides a silicon carbide matrix phase and the decomposition of the titanium tetrachloride provides a uniformly dispersed second phase of the intermetallic titanium disilicide within the matrix phase. The fracture toughness of the ceramic composite is in the range of about 6.5 to 7.0 MPa.sqroot.m which represents a significant increase over that of silicon carbide.

Stinton, David P. (Knoxville, TN); Lackey, Walter J. (Oak Ridge, TN); Lauf, Robert J. (Oak Ridge, TN)

1986-01-01T23:59:59.000Z

344

Model-Independent Semileptonic Form Factors Using Dispersion Relations  

E-Print Network (OSTI)

We present a method for parametrizing heavy meson semileptonic form factors using dispersion relations, and from it produce a two-parameter description of the B -> B elastic form factor. We use heavy quark symmetry to relate this function to B -> D* l nu form factors, and extract |V_cb|=0.0355^{+0.0029}_{-0.0025} from experimental data with a least squares fit. Our method eliminates model-dependent uncertainties inherent in choosing a parametrization for the extrapolation of the differential decay rate to threshold.

C. G. Boyd; B. Grinstein; R. Lebed

1995-08-04T23:59:59.000Z

345

Nonphotochemical hole burning and dispersive kinetics in amorphous solids  

SciTech Connect

Results covering burn intensities in the nW to {mu}W/cm{sup 2} range, of dispersive hole growth kinetics are reported for Oxazine 720 in glycerol glasses and polyvinyl alcohol polymer films and their deuterated analogues. A theoretical model which employs a distribution function for the hole burning rate constant based upon a Gaussian distribution for the tunnel parameter is shown to accurately describe the kinetic data. This model incorporates the linear electron-phonon coupling. A method for calculating the nonphotochemical quantum yield is presented which utilizes the Gaussian distribution of tunnel parameters. The quantum yield calculation can be extended to determine a quantum yield as a function of hole depth. The effect of spontaneous hole filling is shown to be insignificant over the burn intensity range studied. Average relaxation rates for hole burning are {approximately}8 orders of magnitude greater than for hole filling. The dispersive kinetics of hole burning are observed to be independent over the temperature range of these experiments, 1.6 to 7.0 K. 6 refs., 20 figs., 1 tab.

Kenney, M.J.

1990-09-21T23:59:59.000Z

346

Monolayer graphene dispersion and radiative cooling for high power LED  

Science Journals Connector (OSTI)

Molecular fan, a radiative cooling by thin film, has been developed and its application for compact electronic devices has been evaluated. The enhanced surface emissivity and heat dissipation efficiency of the molecular fan coating are shown to correlate with the quantization of lattice modes in active nanomaterials. The highly quantized G and 2D bands in graphene are achieved by our dispersion technique, and then incorporated in an organic-inorganic acrylate emulsion to form a coating assembly on heat sinks (for LED and CPU). This water-based dielectric layer coating has been formulated and applied on metal core printed circuit boards. The heat dissipation efficiency and breakdown voltage are evaluated by a temperature-monitoring system and a high-voltage breakdown tester. The molecular fan coating on heat dissipation units is able to decrease the equilibrium junction temperature by 29.1? C, while functioning as a dielectric layer with a high breakdown voltage (>5kV). The heat dissipation performance of the molecular fan coating applied on LED devices shows that the coated 50W LED gives an enhanced cooling of 20% at constant light brightness. The schematics of monolayer graphene dispersion, undispersed graphene platelet, and continuous graphene sheet are illustrated and discussed to explain the mechanisms of radiative cooling, radiative/non-radiative, and non-radiative heat re-accumulation.

Tun-Jen Hsiao; Tsehaye Eyassu; Kimberly Henderson; Taesam Kim; Chhiu-Tsu Lin

2013-01-01T23:59:59.000Z

347

Dispersion model development for open burn/open detonation sources  

SciTech Connect

The disposal of obsolete munitions, propellants, and manufacturing wastes is conducted at Department of Defense (DOD) and Department of Energy (DOE) facilities. The most common disposal method is open burning (OB) and open detonation (OD) of the material, which occurs in an earthen pit or bermed area. OB/OD operations generate air pollutants and require predictions of pollutant concentrations. The pollutants include SO{sub 2}, NO{sub x}, particulates, volatile organic compounds and toxic materials such as metals, semivolatile organics, etc. Dispersion models are used to estimate pollutant concentrations given the source and meteorological conditions. However, there is currently no recommended EPA dispersion model to address OB/OD sources. Due to the constraints of existing models, a model development program was initiated under the DOD/DOE Strategic Environmental Research and Development Program. In Section 2, the authors give an overview of the model design which is divided into simple and research components. Sections 3 and 4 describe the simple component which includes Gaussian puff and analytic plume models.

Weil, J.C.; Templeman, B. [Univ. of Colorado, Boulder, CO (United States); Banta, R.; Weber, R. [NOAA-ETL, Boulder, CO (United States). Environmental Research Labs.; Mitchell, W. [Environmental Protection Agency, Research Triangle Park, NC (United States)

1996-12-31T23:59:59.000Z

348

Advective diffusive/dispersive transport in geochemical processes  

SciTech Connect

Comprehensive understanding of chemical transport in response to fluid flow and diffusion in geologic processes requires thermodynamic and transport properties of a wide variety of aqueous species at the temperature and pressure of interest, as well as mass transfer computer codes that provide simultaneously for fluid flow, diffusion, dispersion, homogeneous chemical reactions, and mineral solubilities. As a result of research carried out with support from DOE in prior years of this grant, considerable progress has been made in developing computer codes to calculate advective-dispersive-diffusional transport at both high and low pressures and temperatures. These codes have become highly sophisticated, but their application to geochemical processes is limited by the availability of thermodynamic and transport data for the major solute species in the aqueous phase. Over the past three years, research has been directed primarily toward characterizing the thermodynamic behavior of concentrated supercritical aqueous electrolyte solutions and predicting the diffusion coefficients of organic species in oil field brines. Related research has been concerned with characterizing the growth rate of hydrothermal alteration zones and assessing the relative importance of aqueous diffusion and heterogeneous reactions at mineral surfaces in geochemical processes. 103 refs., 12 figs.

Helgeson, H.C.

1991-05-28T23:59:59.000Z

349

Liver antioxidant and plasmatic immune responses in juvenile1 golden grey mullet (Liza aurata) exposed to dispersed crude oil2  

E-Print Network (OSTI)

) exposed to dispersed crude oil2 3 Thomas Milinkovitch1* , Awa Ndiaye2 , Wilfried Sanchez2 , Stéphane Le ; CD : Chemically Dispersed oil ; D : Dispersant solution ; MD : Mechanically Dispersed oil; WSF application is an oil spill response technique. To evaluate the environmental31 cost of this operation

Paris-Sud XI, Université de

350

Enhanced immunological and detoxification responses in Pacific oysters, Crassostrea gigas, exposed1 to chemically dispersed oil2  

E-Print Network (OSTI)

to chemically dispersed oil2 3 Luna-Acosta, A.a,* , Kanan, R.b , Le Floch, S.b , Huet, V.a , Pineau P;Abstract: The aim of this study was to evaluate the effects of chemically dispersed oil on an20 of the chemical dispersant. After 2 days of exposure to chemically dispersed28 oil, alkylated naphthalenes

Boyer, Edmond

351

arXiv:1306.4564v1[math.GT]19Jun2013 Bitwist manifolds and two-bridge knots  

E-Print Network (OSTI)

arXiv:1306.4564v1[math.GT]19Jun2013 Bitwist manifolds and two-bridge knots J. W. CANNON W. J. FLOYD, explicit, and simple face-pairing descriptions of all of the branched cyclic covers of S3 branched over two-bridge for F1 , S1 , K+ , and K- 7. Surgery diagrams for the general two-bridge knot 8. Continued Fractions 9

Purcell, Jessica

352

AHF: Array-Based Half-Facet Data Structure for Mixed-Dimensional and Non-Manifold Meshes  

SciTech Connect

We present an Array-based Half-Facet mesh data structure, or AHF, for efficient mesh query and modification operations. The AHF extends the compact array-based half-edge and half-face data structures (T.J. Alumbaugh and X. Jiao, Compact array-based mesh data structures, IMR, 2005) to support mixed-dimensional and non-manifold meshes. The design goals of our data structure include generality to support such meshes, efficiency of neighborhood queries and mesh modification, compactness of memory footprint, and facilitation of interoperability of mesh-based application codes. To accomplish these goals, our data structure uses sibling half-facets as a core abstraction, coupled with other explicit and implicit representations of entities. A unique feature of our data structure is a comprehensive implementation in MATLAB, which allows rapid prototyping, debugging, testing, and deployment of meshing algorithms and other mesh-based numerical methods. We have also developed C++ implementation built on top of MOAB (T.J. Tautges, R. Meyers, and K. Merkley, MOAB: A Mesh-Oriented Database, Sandia National Laboratories, 2004). We present some comparisons of the memory requirements and computational costs, and also demonstrate its effectiveness with a few sample applications.

Dyedov, Volodymyr; Ray, Navamita; Einstein, Daniel R.; Jiao, Xiangmin; Tautges, T.

2014-08-31T23:59:59.000Z

353

An investigation of numerical dispersion in the hot water injection process  

E-Print Network (OSTI)

dispersion is important in the simulation of the hot water injection process with heat loss. Numerical results are compared to the analytical solution of the simple convective-diffusion problem and Lauwerier's analytical solution to the hot water... simulated, then some type of method for controlling numerical dispersion will have to be implemented. It is obvious from the numerical results that numerical dispersion is affected by injection velocity and distance travelled, but these variables do...

McVay, Duane Allen

2012-06-07T23:59:59.000Z

354

Investigations of MACCS2 for LANL Dispersion Analysis  

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

Investigations of MACCS2 Investigations of MACCS2 Investigations of MACCS2 Investigations of MACCS2 for LANL Dispersion Analysis p y DOE Workshop Germantown, MD Raymond F. Sartor, Ph.D. Safety Basis Technical Services June 5-6, 2012 Safety Basis - Technical Services Los Alamos National Laboratory Operated by Los Alamos National Security, LLC for NNSA U N C L A S S I F I E D Basic Equation for Ground-Level Release Basic Equation for Ground-Level Release                                                

355

Methods and apparatus for controlling dispersions of nanoparticles  

DOE Patents (OSTI)

Electrically reconfigurable metamaterial with spatially varied refractive index is proposed for applications such as optical devices and lenses. The apparatus and method comprises a metamaterial in which the refractive indices are modified in space and time by applying one or more electric fields. The metamaterials are electrically controllable and reconfigurable, and consist of metal (gold, silver, etc.) particles of different shapes, such as rods, with dimension much smaller than the wavelength of light, dispersed in a dielectric medium. The metamaterial is controlled by applying a non-uniform electric field that causes two effects: (1) It aligns the metallic anisometric particles with respect to the direction of the applied electric field and (2) It redistributes particles in space, making their local concentration position dependent.

Lavrentovich, Oleg D; Golovin, Andrii B

2014-10-21T23:59:59.000Z

356

Measurement of Propagation Time Dispersion in a Scintillator  

E-Print Network (OSTI)

One contribution to the time resolution of a scintillation detector is the signal time spread due to path length variations of the detected photons from a point source. In an experimental study a rectangular scintillator was excited by means of a fast pulsed ultraviolet laser at different positions along its longitudinal axis. Timing measurements with a photomultiplier tube in a detection plane displaced from the scintillator end face showed a correlation between signal time and tube position indicating only a small distortion of photon angles during transmission. The data is in good agreement with a Monte Carlo simulation used to compute the average photon angle with respect to the detection plane and the average propagation time. Limitations on timing performance that arise from propagation time dispersion are expected for long and thin scintillators used in future particle identification systems.

P. Achenbach; C. Ayerbe Gayoso; J. Bernauer; R. Bhm; M. O. Distler; L. Doria; J. Friedrich; H. Merkel; U. Mller; L. Nungesser; J. Pochodzalla; S. Snchez Majos; S. Schlimme; Th. Walcher; M. Weinriefer

2007-02-25T23:59:59.000Z

357

Lifetime of nuclear velocity dispersion drops in barred galaxies  

E-Print Network (OSTI)

We have made hydro/N-body simulations with and without star formation to shed some light on the conditions under which a central kinematically cold stellar component (characterized by a velocity dispersion drop or \\sigma-drop) could be created in a hot medium (e.g. a bulge) and survive enough time to be observed. We found that the timescale for a \\sigma-drop formation could be short (less than 500 Myr) whereas its lifetime could be long (more than 1 Gyr) provided that the central region is continuously or regularly fed by fresh gas which leads to a continuous star formation activity. Star formation in the central region, even at a low rate as 1M_{sol} yr^{-1}, is mandatory to sustain a permanent \\sigma-drop by replacing heated particles by new low-\\sigma ones. We moreover show that as soon as star formation is switched off, the \\sigma-drop begins to disappear.

Herve Wozniak; Nicolas Champavert

2006-03-29T23:59:59.000Z

358

Dispersion relations of mesons in symmetric nuclear matter  

E-Print Network (OSTI)

We calculate dispersion relations and propagators for the $\\sigma$, $\\omega$, $\\pi$, $\\rho$, $\\delta$, $\\eta$ and $a_1$ mesons in relativistic, dense, hot, symmetric nuclear matter. In addition to the usual mixing of the $\\sigma-\\omega$ system, we obtain mixing of the $\\delta$ with the longitudinal $\\rho$ mode and of the tranverse $\\rho$ with the transverse $a_1$ mode. Finally, the component of the $a_1$ polarization along the transferred momentum modifies the in-medium pion propagator in a way similar to the Migdal contact interaction, but with the opposite sign. The spurious pion condensate as well as the additional contribution from the $a_1$ meson are removed by a contact term. We compare two ways of implementing contact term subtraction.

L. Mornas

2001-07-02T23:59:59.000Z

359

Symbolic computation of solitons in the normal dispersion regime of inhomogeneous optical fibres  

SciTech Connect

A nonlinear Schroedinger equation with varying dispersion, nonlinearity and gain (or absorption) is studied for ultrashort optical pulses propagating in inhomogeneous optical fibres in the case of normal dispersion. Using the modified Hirota method and symbolic computation, the bilinear form and analytic soliton solution are derived. Stable bright and dark solitons are observed in the normal dispersion regime. A periodically varying soliton and compressed soliton without any fluctuation are obtained. Combined and kink-shaped solitons are observed. Possibly applicable soliton control techniques, which are used to design dispersion-managed systems, are proposed. The proposed techniques may find applications in soliton management communication links, soliton compression and soliton control. (solitons)

Liu Wenjun; Tain Bo; Li Min; Jiang Yan; Qu Qixing; Wang Pan; Sun Kun [School of Science, Beijing University of Posts and Telecommunications, Beijing (China)

2011-06-30T23:59:59.000Z

360

The Development of a Non-Equilibrium Dispersed Flow Film Boiling Heat Transfer Modeling Package.  

E-Print Network (OSTI)

??The dispersed flow film boiling (DFFB) heat transfer regime is important to several applications including cryogenics, rocket engines, steam generators, and in the safety analysis (more)

Meholic, Michael

2011-01-01T23:59:59.000Z

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


361

Extensional rheology of shear-thickening fumed silica nanoparticles dispersed in an aqueous polyethylene  

E-Print Network (OSTI)

polyethylene oxide solution Sunilkumar Khandavalli and Jonathan P. Rothsteina) Mechanical and Industrial rheology of fumed silica nanoparticles dispersed in an aqueous polyethylene oxide (PEO) solution

Rothstein, Jonathan

362

E-Print Network 3.0 - altered dispersion relations Sample Search...  

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

in mean dispersal distances were not linearly related to the degree of plant... (Westcott and Graham 2000). Although different behaviors can alter seed ... Source: Carlo,...

363

Anisotropic Ordering in Nanoclay Dispersions Induced by WaterAir Interface  

Science Journals Connector (OSTI)

This chapter reports the kinetics of interface induced generation and propagation of arrested phase caused anisotropy in Laponite dispersions probed by depolarized light scattering experiments. Growth of aniso...

Ravi Kumar Pujala

2014-01-01T23:59:59.000Z

364

E-Print Network 3.0 - ancient oceanic dispersal Sample Search...  

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

Summary: region. Key words. Biogeography, cytochrome b, dispersal, mitochondrial DNA, ocean currents, population... Ocean basin was largely the same as it is today. Thus, it is...

365

Highly Dispersed and Nano-sized Pt-based Electrocatalysts for Low-Temperature Fuel Cells  

Science Journals Connector (OSTI)

The present article reviews the development of highly dispersed and nano-sized Pt- ... the addition of metal oxide to Pt/C electrocatalyst as cathode material.

Dong-Ha Lim; Weon-Doo Lee; Ho-In Lee

2008-12-01T23:59:59.000Z

366

Plume Rise and Dispersion of Emissions from Low Level Buoyant Sources in Urban Areas  

E-Print Network (OSTI)

on dispersion from a distributed generator in a real urbanimpact of Distributed Power Generators on the concentrationsknown as distributed power generators ( DGs). From January

Pournazeri, Sam

2012-01-01T23:59:59.000Z

367

Modulating dispersion properties of low index photonic crystal structures using microfluidics  

Science Journals Connector (OSTI)

We present a technique for manipulating the dispersive properties of low index periodic structures using microfluidic materials that fill the lattice with various fluids of different...

Sharkawy, Ahmed; Pustai, David; Shi, Shouyuan; Prather, Dennis; McBride, Sterling; Zanzucchi, Peter

2005-01-01T23:59:59.000Z

368

Holographic manipulation of nanoparticle distribution morphology in nanoparticle-dispersed photopolymers  

Science Journals Connector (OSTI)

We report on experimental verification of mass transfer of nanoparticles during holographic recording in nanoparticle-dispersed photopolymers. Through direct observations of the...

Tomita, Yasuo; Suzuki, Naoaki; Chikama, Katsumi

2005-01-01T23:59:59.000Z

369

E-Print Network 3.0 - amplified dispersive fourier Sample Search...  

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

Collection: Engineering ; Materials Science 33 Broad band p-Ge optical amplifier of terahertz radiation A. V. Muravjov and S. H. Withers Summary: is undistorted by dispersion...

370

E-Print Network 3.0 - atmospheric dispersion coefficient Sample...  

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

spill countermeasures to reduce the adverse effects of spilled oil on the environment. Dispersants Source: NOAA Marine Fisheries Review; National Oceanic and Atmospheric...

371

E-Print Network 3.0 - ancient hominin dispersals Sample Search...  

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

earliest Acheulean stone tool technology, and the first dispersal of hominins out of Africa. Two sites... - ularly climate, affect the evolution of our hominin ancestors and...

372

E-Print Network 3.0 - america geographic dispersal Sample Search...  

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

over Summary: dictated by multiple episodes of vicariance and dispersal madagascar africa eurasia N & S america india... and abundances? Recognized by Darwin and Wallace...

373

Objected constrained registration and manifold learning: A new patient setup approach in image guided radiation therapy of thoracic cancer  

SciTech Connect

Purpose: The management of thoracic malignancies with radiation therapy is complicated by continuous target motion. In this study, a real time motion analysis approach is proposed to improve the accuracy of patient setup. Methods: For 11 lung cancer patients a long training fluoroscopy was acquired before the first treatment, and multiple short testing fluoroscopies were acquired weekly at the pretreatment patient setup of image guided radiotherapy (IGRT). The data analysis consisted of three steps: first a 4D target motion model was constructed from 4DCT and projected to the training fluoroscopy through deformable registration. Then the manifold learning method was used to construct a 2D subspace based on the target motion (kinetic) and location (static) information in the training fluoroscopy. Thereafter the respiratory phase in the testing fluoroscopy was determined by finding its location in the subspace. Finally, the phase determined testing fluoroscopy was registered to the corresponding 4DCT to derive the pretreatment patient position adjustment for the IGRT. The method was tested on clinical image sets and numerical phantoms. Results: The registration successfully reconstructed the 4D motion model with over 98% volume similarity in 4DCT, and over 95% area similarity in the training fluoroscopy. The machine learning method derived the phase values in over 98% and 93% test images of the phantom and patient images, respectively, with less than 3% phase error. The setup approach achieved an average accumulated setup error less than 1.7 mm in the cranial-caudal direction and less than 1 mm in the transverse plane. All results were validated against the ground truth of manual delineations by an experienced radiation oncologist. The expected total time for the pretreatment setup analysis was less than 10 s. Conclusions: By combining the registration and machine learning, the proposed approach has the potential to improve the accuracy of pretreatment setup for patients with thoracic malignancy.

Chen Ting; Jabbour, Salma K.; Haffty, Bruce G.; Yue, Ning [Radiation Oncology Department, Cancer Institute of New Jersey, University of Medicine and Dentistry of New Jersey, 195 Little Albany Street, New Brunswick, New Jersey 08901 (United States); Qin Songbing [Department of Radiation Oncology, The First Affiliated Hospital of Soochow University, Suzhou 215006 (China)

2013-04-15T23:59:59.000Z

374

Laboratory measurement of hydrodynamic saline dispersion within a micro-fracture network induced in granite  

E-Print Network (OSTI)

Laboratory measurement of hydrodynamic saline dispersion within a micro-fracture network induced plug of Ailsa Craig micro-granite by thermal stressing, to produce an isotropic network of fractures number­dispersion relationship for the micro-fracture network is very similar to that predicted for other

375

The Role of Dispersion in Radionuclide Transport - Data and Modeling Requirements: Revision No. 1  

SciTech Connect

This document is the collaborative effort of the members of an ad hoc subcommittee of the Underground Test Area Project Technical Working Group. This subcommittee was to answer questions and concerns raised by the Nevada Division of Environmental Protection to the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office, regarding Pahute Mesa Corrective Action Units (CAUs) 101 and 102. The document attempts to synthesize the combined comments made by each member of this subcommittee into insights made in the role of dispersion in radionuclide transport data and modeling. Dispersion is one of many processes that control the concentration of radionuclides in groundwater beneath the Nevada Test Site where CAUs 101 and 102 are located. In order to understand the role of dispersion in radionuclide transport, there is a critical need for CAU- or site-specific data related to transport parameters which is currently lacking, particularly in the case of Western a nd Central Pahute Mesa. The purpose of this technical basis document is to: (1) define dispersion and its role in contaminant transport, (2) present a synopsis of field-scale dispersion measurements, (3) provide a literature review of theories to explain field-scale dispersion, (4) suggest approaches to account for dispersion in CAU-scale radionuclide modeling, and (5) to determine if additional dispersion measurements should be made at this time.

Stoller-Navarro Joint Venture

2004-02-01T23:59:59.000Z

376

Entry Dispersion Analysis for the HAYABUSA Spacecraft using Ground-Based Optical Observation  

Science Journals Connector (OSTI)

......backup plans for predicting the landing location were prepared. This...trouble. We also evaluated the landing dispersion of HAYABUSA only...in 1999 to collect dust from comet Wild-2 Desai et al. (2008...view). Figure 9 depicts the landing dispersion ellipse for cases......

Tomohiro Yamaguchi; Makoto Yoshikawa; Masafumi Yagi; David J. Tholen

2011-10-25T23:59:59.000Z

377

Dispersed Repetitive DNA Has Spread to New Genomes Since Polyploid Formation in Cotton  

E-Print Network (OSTI)

Dispersed Repetitive DNA Has Spread to New Genomes Since Polyploid Formation in Cotton Xin recently formed polyploid, cotton (Gossypium barbadense L.; AD genome), 83 non-cross-hybridizing DNA clones tetraploid cotton. In tetraploid cotton, FISH analysis showed that some A-genome dispersed repeats appear

Wendel, Jonathan F.

378

Price Dispersion in the Housing Market: The Role of Bargaining and Search Costs  

E-Print Network (OSTI)

Price Dispersion in the Housing Market: The Role of Bargaining and Search Costs Gaetano Lisi a basic fact of housing markets: price dispersion. The variance in house prices is basically due to both the deal. Furthermore, the house price is substantially determined by bargaining between the parties

Boyer, Edmond

379

Page 1 of 19 Title: Dispersion diagrams of waves in the simulated solar chromosphere  

E-Print Network (OSTI)

Page 1 of 19 Title: Dispersion diagrams of waves in the simulated solar chromosphere Authors and affiliations: Dove, C., Zita, E.J., Bogdan, T.J., 1) Introduction: What role do MHD waves play in the dynamics. And the only way to absolutely test theory is by observation. By generating dispersion diagrams from simulation

Zita, E.J.

380

Dispersion measurement as a method of quantifying geologic characterization and defining reservoir heterogeneity. Final report  

SciTech Connect

The main objective of this research project is to investigate dispersion as a method of quantifying geological characterization and defining reservoir heterogeneity in order to enhance crude oil recovery. The dispersion of flow of a reservoir rock (dispersion coefficient and dispersivity) was identified as one of the physical properties of a reservoir rock by measuring the mixing of two miscible fluids, one displacing the other in a porous medium. A rock was 100% saturated with a resident fluid and displaced by a miscible fluid of equal viscosity and equal density. Some specific experiments were performed with unequal densities. Produced fluid was analyzed by refractometer, nuclear reaction, electrical conductivity and X-ray scan. Several physical and flow characteristics were measured on the sand rock sample in order to establish correlations with the measured dispersion property. Absolute permeability, effective porosity, relative permeability, capillary pressure, the heterogeneity factor and electrical conductivity were used to better understand the flow system. Linear, transverse, 2-D and 3-D dispersions were measured and used to characterize the rock heterogeneity of the flow system. A new system of measuring dispersion was developed using a gas displacing gas system in a porous medium. An attempt was also made to determine the dispersion property of an actual reservoir from present day well log data on a producing well. 275 refs., 102 figs., 17 tabs.

Menzie, D.E.

1995-05-01T23:59:59.000Z

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


381

Ni-dispersed fullerenes: Hydrogen storage and desorption properties Weon Ho Shin and Seong Ho Yang  

E-Print Network (OSTI)

Ni-dispersed fullerenes: Hydrogen storage and desorption properties Weon Ho Shin and Seong Ho Yang could be viable alternatives to reversible hydrogen storage. It is demonstrated that a single Ni coated-dispersed fullerenes are considered to be the novel hydrogen storage media capable of storing 6.8 wt % H2, thus

Goddard III, William A.

382

Piston Dispersive Shock Wave Problem M. A. Hoefer,1,* M. J. Ablowitz,2  

E-Print Network (OSTI)

Piston Dispersive Shock Wave Problem M. A. Hoefer,1,* M. J. Ablowitz,2 and P. Engels3 1 National University, Pullman, Washington 99164, USA (Received 24 October 2007; published 28 February 2008) The piston solutions are calculated for a piston (step potential) moving with uniform speed into a dispersive fluid

Hoefer, Mark

383

Participatory Sensing in Commerce: Using Mobile Camera Phones to Track Market Price Dispersion  

E-Print Network (OSTI)

-of-concept participatory mobile camera-phone sensing systems that we have built: (1) automating fuel price collectionParticipatory Sensing in Commerce: Using Mobile Camera Phones to Track Market Price Dispersion In economics, price dispersion refers to the price difference of a homogeneous good across different vendors

Bulusu, Nirupama

384

Population Ecology at the Range Edge Survival and Dispersal of a High-Density Lepidopteran  

E-Print Network (OSTI)

Population Ecology at the Range Edge Survival and Dispersal of a High-Density Lepidopteran Population Cecilia Ronnås Faculty of Natural Resources and Agricultural Sciences Department of Ecology Service/Repro, Uppsala 2011 #12;Population Ecology at the Range Edge. Survival and Dispersal of a High

385

THE DISPERSIVE EFFECT OF SODIUM HEXAMETAPHOSPHATE ON KAOLINITE IN SALINE WATER  

Science Journals Connector (OSTI)

...MgCl2. In the presence of HMP, the dispersant effectively rendered the surfaces of...provide extra adsorption sites for the dispersant, because the zeta potentials of kaolinite...bivalent cations. Journal of Inorganic and Nuclear Chemistry , 36 , 1605-1609. Lagaly...

Mark Ma

386

Nuclear magnetic relaxation dispersion investigations1 of water retention mechanism by cellulose ethers in mortars2  

E-Print Network (OSTI)

Nuclear magnetic relaxation dispersion investigations1 of water retention mechanism by cellulose : 10.1016/j.cemconres.2012.06.002 #12;2 ABSTRACT22 23 We show how nuclear magnetic spin-lattice relaxation dispersion of protons-water24 (NMRD) can be used to elucidate the effect of cellulose ethers

Boyer, Edmond

387

An Algorithm for ODES from Atmospheric Dispersion I. Ahmad and M. Berzins  

E-Print Network (OSTI)

An Algorithm for ODES from Atmospheric Dispersion Problems. I. Ahmad and M. Berzins School of ordinary differential equations o.d.e.s, arising from atmospheric dispersion problems is considered to illustrate the performance of the method. 1 Introduction. The increasing level of air pollution makes it ever

Utah, University of

388

Monitoring of Landfill Leachate Dispersion Using Reflectance Spectroscopy and Ground-Penetrating Radar  

Science Journals Connector (OSTI)

Monitoring of Landfill Leachate Dispersion Using Reflectance Spectroscopy and Ground-Penetrating Radar ... The generation and dispersion of leachate from landfills are slow, unsteady, nonuniform, and sometimes discontinuous depending on the degree of compaction of the fill, seasonal changes in the water supply to the system, and changes in the capping and contaminant walls (2). ...

T. Splajt; G. Ferrier; L. E. Frostick

2003-08-12T23:59:59.000Z

389

Breeding Dispersal and Nesting Behavior of Burrowing Owls Following Experimental Nest Predation  

E-Print Network (OSTI)

Breeding Dispersal and Nesting Behavior of Burrowing Owls Following Experimental Nest Predation D, Corvallis 97331 ABSTRACT.--Nest predation is considered a primary factor affecting the life-history characteristics and particularly dispersal of many avian species. We tested the hypothesis that nest predation

Rosenberg, Daniel K.

390

Linear dispersion relation for the mirror instability in context of the gyrokinetic theory  

SciTech Connect

The linear dispersion relation for the mirror instability is discussed in context of the gyrokinetic theory. The objective is to provide a coherent view of different kinetic approaches used to derive the dispersion relation. The method based on gyrocenter phase space transformations is adopted in order to display the origin and ordering of various terms.

Porazik, Peter; Johnson, Jay R. [Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08542 (United States)] [Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08542 (United States)

2013-10-15T23:59:59.000Z

391

Coupling traffic models on networks and urban dispersion models for simulating sustainable  

E-Print Network (OSTI)

models for modeling and testing different traffic scenarios, in order to define the impact on air quality it with the urban dispersion model Sirane. Keywords: urban air quality, macroscopic traffic models, road networks, pollutant dispersion models, traffic emissions control. AMS subject classification: 35L65, 35L67, 60K30, 90B

Ceragioli, Francesca

392

Nile-RedNanoclay Hybrids: Red Emissive Optical Probes for Use in Aqueous Dispersion  

Science Journals Connector (OSTI)

Nile-RedNanoclay Hybrids: Red Emissive Optical Probes for Use in Aqueous Dispersion ... Water-dispersible and (bio)functionalizable nanoclays have a considerable potential as inexpensive carriers for organic molecules like drugs and fluorophores. ... Otherwise, fluorescent nanoclays can be obtained via covalent attachment of reactive dyes at the edges of the nanoclay sheets after surface modification using silanization chemistries. ...

Tom Felbeck; Thomas Behnke; Katrin Hoffmann; Markus Grabolle; Marina M. Lezhnina; Ulrich H. Kynast; Ute Resch-Genger

2013-08-13T23:59:59.000Z

393

Surface modified coals for enhanced catalyst dispersion and liquefaction  

SciTech Connect

The aim of the study is to enhance catalyst loading and dispersion in coal for improved liquefaction by preadsorption of surfactants and catalysts on to the coal. During this reporting period, zeta potential measurements were conducted to assess the surface charge on the raw, pretreated and catalyzed coal samples. The surface area, transmission spectroscopy and luminescence intensity of the raw coal and pretreated coal samples were also determined to assess the quality of the coal surface. Across a broad range of pH values, the raw coal had an overall negative charge. Coal treated with anionic surfactant SDS maintained an overall net negative surface negative charge. The interaction between the coal and cationic surfactant DDAB caused the opposite effect resulting in a more positive coal surface charge. Although one would have expected little or no effect of the neutral surfactant Triton X-100, there appears to be some difference in the results of the raw coal and the coal treated with Triton X-100. The authors believe that the Triton not only binds to the nonpolar sites but also has a strong affinity for the polar sites through electrostatic bonding and interaction between the hydrophobic tails. The addition of molybdenum to coal pretreated with DDAB caused a reduction in the positive charge of the coal surface probably due to possible ionic interaction between the coal surface, the surfactant and the catalyst. The adsorption isotherm of the coal was characteristic of isotherms for porous samples and the surface area of the coal increased from 30 m{sup 2}/g to 77 m{sup 2}/g when washed with deionized water. This suggests coal washing may be one method of increasing the surface area for surfactant adsorption. Although the transmission measurements provided valuable information about the coal it resulted in little information on the amount of adsorbed Triton. However, the maximum solid-liquid ratio for optimum surfactant loading of Triton X-100 was determined via the UV-Vis spectrophotometer. The luminescence intensity measurements showed that the coal and surfactants luminescence weakly. No statistically significant influence was observed from the actions of the surfactants or surfactant-molybdenum catalyst. Qualitative inspection however, showed that SDS might effectively coat coal surfaces and influence catalyst dispersion. Also, catalysts appeared to be better distributed among coal particles and in finer clusters when DDAB and Triton surfactants were used.

Dr. Yaw D. Yeboah

1998-10-29T23:59:59.000Z

394

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah,  

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

Dispersivity Testing of Zero-Valent Iron Treatment Cells: Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 Dispersivity Testing of Zero-Valent Iron Treatment Cells: Monticello, Utah, November 2005 Through February 2008 More Documents & Publications Final Report Phase II: Performance Evaluation of Permeable Reactive Barriers and Potential for Rejuvenation by Chemical Flushing Phase II: Performance Evaluation of Permeable Reactive Barriers and Potential for Rejuvenation by Chemical Flushing Third (March 2006) Coring and Analysis of Zero-Valent Iron Permeable

395

Update 3 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

3 to: A Dispersion Modeling Analysis of Downwash from 3 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Units 1 and 4 Together Update 3 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Units 1 and 4 Together Docket No. EO-05-01. Docket No. EO-05-01. This report describes dispersion modeling performed for Units 1 and 4 at Mirant's Potomac River Generating Station. The purpose of the modeling was to demonstrate that Units 1 and 4, operating together under specific loads and during certain periods in a calendar day will not cause or contribut to excceedences of the National Ambient Air Quality Standards (NAAQS). Update 2 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Units 1 and 4 Together

396

Update 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

4 to: A Dispersion Modeling Analysis of Downwash from 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 4 Emissions at Maximum and Minimum Loads Update 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 4 Emissions at Maximum and Minimum Loads Docket No. EO-05-01. This report describes dispersion modeling performed for Unit 4 at Mirant's Potomac River Generating Station. The modeling was performed according to the Protocol approved by the Virginia Deparment of Environmental Quality. The purpose of the modeling was to demonstrate that Unit 4, operating alone under minimum and maximum loads will not cause or contribute to exceedances of the National Ambient Air Quality Standards (NAAQS). Update 4 to: A Dispersion Modeling Analysis of Downwash from Mirant's

397

A new statistical dispersion model for tracer tests and contaminant spread in porous media  

SciTech Connect

Dispersion of solutes moving in permeable media is an essential control to describe fluid flow in permeable media. Dispersion can be thought of as a spreading of a solute caused by the presence of microscopic inhomogeneities. An accurate model for dispersion is needed for accurate estimation of oil recovery efficiencies and clean up costs of subsurface contaminants. Current approaches utilizing the fickian assumption fall short in describing the real physics of spreading during a solute transport process. Numerous field investigations have shown that dispersivities measured in the field are much larger than those measured in the lab for the same type of porous material. Moreover, field measured dispersivities have been shown to be scale dependent, that is, a tracer test conducted over a longer travel path will yield a larger dispersivity value than a tracer test conducted in the same geologic formation over a shorter travel path. Numerous approaches to address this problem have been developed yet none attempted to go beyond the Fickian dispersion assumption. In this study, a convective dispersivity is introduced. New model assumes that dispersion is dimensionless and mainly determined by pore size distribution. The new model results in a spread that increases linearly with time contrary to conventional model, which predicts a mixing zone length that increases with square root of time. Therefore, new model explains the field test results that indicate increasing dispersivity with distance. The model validations are in perfect agreement with experimental results, which include; Ganapathy et al.`s slug experiment on Antolini sandstone, Handy`s radioactive tracer experiment on Alhambra sandstone, and CT experiment conducted at BDM-OK/NIPER facilities on Tallant sandstone.

Ates, H.; Kasap, E. [Univ. of Tulsa, OK (United States)

1995-12-31T23:59:59.000Z

398

Fluidity of highly concentrated kaolin suspensions: Influence of particle concentration and presence of dispersant  

Science Journals Connector (OSTI)

This work discusses fluidity of highly concentrated kaolin suspensions prepared by filtration technique in the presence of a dispersant (sodium salt of polyacrylic acid). Two types of rheological tests were carried out on the kaolin aqueous suspensions at different concentrations of kaolin C (1275wt.%) and dispersant Cd (01wt.% of dispersant/wt. of solid). A classical coaxial viscosimeter was used to measure viscosity of suspension when it was fluid-like. A texture analyser was used for rheological analysis of the thicker kaolin suspensions. A solgel (percolation) transition, starting from the kaolin volume fraction ?c=0.05, was observed in the absence of a dispersant. The addition of a dispersant shifted this percolation transition to higher volume fractions. The rheological data showed that the platelet particles can align in a hydrodynamic flow. A dispersant or kaolin load suppresses the interaction forces between basal and edge faces of the kaolin particles, which bear different charges. As a result, a face-to-face arrangement arises, which is supported by the electron microscopy images. Hence, the loosely packed card-house structure, which is typical for the aqueous kaolin suspensions, undergoes a gradual conversion into an oriented structure under the load of solid particles or dispersant. A maximum of the percolation threshold was reached for a certain optimum dosage of the dispersant (Cd?0.5wt.%). The higher filtration efficiency was observed for a loosely packed card-house structure in dispersant-free suspensions at low pH. A dispersant improves fluidity and dryness of the filter cakes, however, produces an oriented face-to-face structure of particles, which causes a rise in resistance to liquid flow during filtration.

Maxim Loginov; Olivier Larue; Nikolai Lebovka; Eugne Vorobiev

2008-01-01T23:59:59.000Z

399

Lithospheric Thickness Modeled from Long Period Surface Wave Dispersion  

SciTech Connect

The behavior of surface waves at long periods is indicative of subcrustal velocity structure. Using recently published dispersion models, we invert surface wave group velocities for lithospheric structure, including lithospheric thickness, over much of the Eastern Hemisphere, encompassing Eurasia, Africa, and the Indian Ocean. Thicker lithosphere under Precambrian shields and platforms are clearly observed, not only under the large cratons (West Africa, Congo, Baltic, Russia, Siberia, India), but also under smaller blocks like the Tarim Basin and Yangtze craton. In contrast, it is found that remobilized Precambrian structures like the Saharan Shield and Sino-Korean Paraplatform do not have well-established lithospheric keels. The thinnest lithospheric thickness is found under oceanic and continental rifts, as well as along convergence zones. We compare our results to thermal models of continental lithosphere, lithospheric cooling models of oceanic lithosphere, lithosphere-asthenosphere boundary (LAB) estimates from S-wave receiver functions, and velocity variations of global tomography models. In addition to comparing results for the broad region, we examine in detail the regions of Central Africa, Siberia, and Tibet. While there are clear differences in the various estimates, overall the results are generally consistent. Inconsistencies between the estimates may be due to a variety of reasons including lateral and depth resolution differences and the comparison of what may be different lithospheric features.

Pasyanos, M E

2008-05-15T23:59:59.000Z

400

Viscosity of alumina nanoparticles dispersed in car engine coolant  

SciTech Connect

The present paper, describes our experimental results on the viscosity of the nanofluid prepared by dispersing alumina nanoparticles (<50 nm) in commercial car coolant. The nanofluid prepared with calculated amount of oleic acid (surfactant) was tested to be stable for more than 80 days. The viscosity of the nanofluids is measured both as a function of alumina volume fraction and temperature between 10 and 50 C. While the pure base fluid display Newtonian behavior over the measured temperature, it transforms to a non-Newtonian fluid with addition of a small amount of alumina nanoparticles. Our results show that viscosity of the nanofluid increases with increasing nanoparticle concentration and decreases with increase in temperature. Most of the frequently used classical models severely under predict the measured viscosity. Volume fraction dependence of the nanofluid viscosity, however, is predicted fairly well on the basis of a recently reported theoretical model for nanofluids that takes into account the effect of Brownian motion of nanoparticles in the nanofluid. The temperature dependence of the viscosity of engine coolant based alumina nanofluids obeys the empirical correlation of the type: log ({mu}{sub nf}) = A exp(BT), proposed earlier by Namburu et al. (author)

Kole, Madhusree; Dey, T.K. [Thermophysical Measurements Laboratory, Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur 721 302 (India)

2010-09-15T23:59:59.000Z

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


401

Dispersion of radioactive pollutant in a tornadic storm  

SciTech Connect

A three-dimensional numerical model is used to calculate ground-level air concentration and deposition (due to precipitation scavenging) after a hypothetical tornado strike at a plutonium fabrication facility in Pennsylvania. Plutonium particles less than 10 ..mu..m in diameter are assumed to be lifted into the tornadic storm cell by the vortex. The rotational characteristics of the tornadic storm are embedded within the larger mesoscale flow of the storm system. The design-basis translational wind values are based on probabilities associated with existing records of tornado strikes in the vicinity of the plant site. Turbulence exchange coefficients are based on empirical values deduced from experimental data in severe storms and from theoretical assumptions obtained from the literature. The quasi-Lagrangian method of moments is used to model the transport of concentration within a grid cell volume. In all case studies, the effects of updrafts and downdrafts, coupled with scavenging of the particulates by precipitation, account for most of the material being deposited within 20 to 45 km downwind of the plant site. Ground-level isopleths in the x-y plane show that most of the material is deposited behind and slightly to the left of the centerline trajectory of the storm. Approximately 5% of the material is dispersed into the stratosphere and anvil section of the storm.

Pepper, D.W.

1981-05-01T23:59:59.000Z

402

Advanced liquefaction using coal swelling and catalyst dispersion techniques  

SciTech Connect

Research in this project centers upon developing a new approach to the direct liquefaction of coal to produce an all-distillate product slate at a sizable cost reduction over current technology. The approach integrates all aspects of the coal liquefaction process including coal selection, pretreatment, coal swelling with catalyst impregnation, coal liquefaction experimentation, product recovery with characterization, alternate bottoms processing, and a technical assessment including an economic evaluation. The project is being carried out under contract to the United States Department of Energy. On May 28, 1992, the Department of Energy authorized starting the experimental aspects of this projects; therefore, experimentation at Amoco started late in this quarterly report period. Research contracts with Auburn University, Pennsylvania State University, and Foster Wheeler Development Corporation were signed during June, 1992, so their work was just getting underway. Their work will be summarized in future quarterly reports. A set of coal samples were sent to Hazen Research for beneficiation. The samples were received and have been analyzed. The literature search covering coal swelling has been up-dated, and preliminary coal swelling experiments were carried out. Further swelling experimentation is underway. An up-date of the literature on the liquefaction of coal using dispersed catalysts is nearing completion; it will be included in the next quarterly report.

Curtis, C.W. (Auburn Univ., AL (United States)); Gutterman, C. (Foster Wheeler Development Corp., Livingston, NJ (United States)); Chander, S. (Pennsylvania State Univ., University Park, PA (United States))

1992-08-26T23:59:59.000Z

403

Shear wave dispersion ultrasound vibrometry of gel dosimetry phantoms.  

Science Journals Connector (OSTI)

Shear wavedispersionultrasound vibrometry (SDUV) has been introduced to use the dispersive nature of shear wave speed to locally estimate the material properties or tissue. Shear waves were created using a mechanical shaker and pulsed radiation force. Using the information from the phase one can estimate the shear velocity. A theoretical Voigt model allows us to find at different frequencies (100400 Hz) the viscosity and shear elasticity of the polymer gel dosimeter. The aim of this work was to perform the SDUV and mechanical vibrometry techniques to study the viscoelastic properties of absorbed dose phantoms. The experiments were performed using five phantoms of different absorbed doses varying 10 up to 50 Gy while a nonirradiated phantom was kept as a control. The SDUV technique was performed using a pulsed radiation force to vibrate the gel provide by a confocal transducer with a focal depth of 70 mm nominal frequency of 3 MHz. For the mechanical vibrometry and SDUV experiments shear wave motion measurements were made with a commercial ultrasound machine with a research using a 10 MHz linear array transducer. The quantitative elasticity and viscosity results for these two experiments were compared.

2009-01-01T23:59:59.000Z

404

Nucleon-Nucleon Interactions from Dispersion Relations: Coupled Partial Waves  

E-Print Network (OSTI)

We consider nucleon-nucleon interactions from chiral effective field theory applying the N/D method. The case of coupled partial waves is now treated, extending Ref. [1] where the uncoupled case was studied. As a result three N/D elastic-like equations have to be solved for every set of three independent partial waves coupled. As in the previous reference the input for this method is the discontinuity along the left-hand cut of the nucleon-nucleon partial wave amplitudes. It can be calculated perturbatively in chiral perturbation theory because it involves only irreducible two-nucleon intermediate states. We apply here our method to the leading order result consisting of one-pion exchange as the source for the discontinuity along the left-hand cut. The linear integral equations for the N/D method must be solved in the presence of L - 1 constraints, with L the orbital angular momentum, in order to satisfy the proper threshold behavior for L>= 2. We dedicate special attention to satisfy the requirements of unitarity in coupled channels. We also focus on the specific issue of the deuteron pole position in the 3S1-3D1 scattering. Our final amplitudes are based on dispersion relations and chiral effective field theory, being independent of any explicit regulator. They are amenable to a systematic improvement order by order in the chiral expansion.

M. Albaladejo; J. A. Oller

2012-10-02T23:59:59.000Z

405

Precision Corrections to Dispersive Bounds on Form Factors  

E-Print Network (OSTI)

We present precision corrections to dispersion relation bounds on form factors in bottom hadron semileptonic decays and analyze their effects on parameterizations derived from these bounds. We incorporate QCD two-loop and nonperturbative corrections to the two-point correlator, consider form factors whose contribution to decay rates is suppressed by lepton mass, and implement more realistic estimates of truncation errors associated with the parameterizations. We include higher resonances in the hadronic sum that, together with heavy quark symmetry relations near zero recoil, further tighten the sum rule bounds. Utilizing all these improvements, we show that each of the six form factors in B --> D l nu and B --> D^* l nu can be described with 3% or smaller precision using only the overall normalization and one unknown parameter. A similar one-coefficient parameterization of one of the Lambda_b --> Lambda_c l nu form factors, together with heavy quark symmetry relations valid to order 1/m^2, describes the differential baryon decay rate in terms of one unknown parameter and the phenomenologically interesting quantity (\\bar Lambda)_Lambda \\approx M_{Lambda_b} - m_b. We discuss the validity of slope-curvature relations derived by Caprini and Neubert, and present weaker, corrected relations. Finally, we present sample fits of current experimental B --> D^*l nu and B --> D l nu data to the improved one-parameter expansion.

C. Glenn Boyd; Benjamin Grinstein; Richard F. Lebed

1997-05-07T23:59:59.000Z

406

THE DISPERSIVE EFFECT OF SODIUM SILICATE ON KAOLINITE PARTICLES IN PROCESS WATER: IMPLICATIONS FOR IRON-ORE PROCESSING  

Science Journals Connector (OSTI)

...contrast to polyacrylic acid (Figure 2...hinders the dispersants adsorption...low-molecular-weight polyacrylic acid on the coagulation...low-molecular-weight polyacrylic acid on silica...widely as a dispersant of silicate...

Mark Ma

407

Lateral solids dispersion coefficient in large-scale fluidized beds  

SciTech Connect

The design of fuel feed ports in a large-scale fluidized bed combustor depends on the fuel characteristics and lateral solids mixing. However, the reported values of the effective lateral solids dispersion coefficient (D{sub sr}) are scattered in the broad range of 0.0001-0.1 m{sup 2}/s. With the aim of predicting D{sub sr} in wider fluidized beds which is difficult to measure directly or deduce from experimental results in lab-scale facilities, a computational method is proposed. It combines the Eulerian-Granular simulation and fictitious particle tracing technique. The value of D{sub sr} is calculated based on the movement of the tracers. The effect on D{sub sr} of bed width (W) ranging from 0.4 m up to 12.8 m at different levels of superficial gas velocity (U{sub 0}) is investigated. It is found that increasing W whilst maintaining U{sub 0}, D{sub sr} initially increases markedly, then its increase rate declines, and finally it stays around a constant value. The computed values of D{sub sr} are examined quantitatively and compared with a thorough list of the measured D{sub sr} in the literature since 1980s. Agreed with the measurements performed in the pilot-scale fluidized beds, the value of D{sub sr} in wider facilities at higher fluidizing velocities is predicted to be around the order of magnitude of 0.1 m{sup 2}/s, much higher than that in lab-scale beds. Finally, the effect of D{sub sr} on the distribution of fuel particles over the cross section in fluidized beds with the specified layout of feed ports is discussed. (author)

Liu, Daoyin; Chen, Xiaoping [School of Energy and Environment, Southeast University, Nanjing 210096 (China)

2010-11-15T23:59:59.000Z

408

On the application of computational fluid dynamics codes for liquefied natural gas dispersion.  

SciTech Connect

Computational fluid dynamics (CFD) codes are increasingly being used in the liquefied natural gas (LNG) industry to predict natural gas dispersion distances. This paper addresses several issues regarding the use of CFD for LNG dispersion such as specification of the domain, grid, boundary and initial conditions. A description of the k-{var_epsilon} model is presented, along with modifications required for atmospheric flows. Validation issues pertaining to the experimental data from the Burro, Coyote, and Falcon series of LNG dispersion experiments are also discussed. A description of the atmosphere is provided as well as discussion on the inclusion of the Coriolis force to model very large LNG spills.

Luketa-Hanlin, Anay Josephine; Koopman, Ronald P. (Lawrence Livermore National Laboratory, Livermore, CA); Ermak, Donald (Lawrence Livermore National Laboratory, Livermore, CA)

2006-02-01T23:59:59.000Z

409

Dispersion engineering of high-Q silicon microresonators via thermal oxidation  

E-Print Network (OSTI)

We propose and demonstrate a convenient and sensitive technique for precise engineering of group-velocity dispersion in high-Q silicon microresonators. By accurately controlling the surface-oxidation thickness of silicon microdisk resonators, we are able to precisely manage the zero-dispersion wavelength while simultaneously further improving the high optical quality of our devices, with the optical Q close to a million. The demonstrated dispersion management allows us to achieve parametric generation with precisely engineerable emission wavelengths, which shows great potential for application in integrated silicon nonlinear and quantum photonics.

Jiang, Wei C; Usechak, Nicholas G; Lin, Qiang

2014-01-01T23:59:59.000Z

410

Integral method for the calculation of Hawking radiation in dispersive media I. Symmetric asymptotics  

E-Print Network (OSTI)

Hawking radiation has become experimentally testable thanks to the many analogue systems which mimic the effects of the event horizon on wave propagation. These systems are typically dominated by dispersion, and give rise to a numerically soluble and stable ODE only if the rest-frame dispersion relation $\\Omega^{2}(k)$ is a polynomial of relatively low degree. Here we present a new method for the calculation of wave scattering in a one-dimensional medium of arbitrary dispersion. It views the wave equation as an integral equation in Fourier space, which can be solved using standard and efficient numerical techniques.

Scott Robertson; Ulf Leonhardt

2014-03-27T23:59:59.000Z

411

A Facile High-speed Vibration Milling Method to Water-disperse Single- walled Carbon Nanohorns  

SciTech Connect

A high-speed vibration milling (HSVM) method was applied to synthesize water dispersible single- walled carbon nanohorns (SWNHs). Highly reactive free radicals (HOOCCH2CH2 ) produced from an acyl peroxide under HSVM conditions react with hydrophobic SWNHs to produce a highly water dispersible derivative (f-SWNHs), which has been characterized in detail by spectroscopic and microscopic techniques together with thermogravimetric analysis (TGA) and dynamic light scatter- ing (DLS). The carboxylic acid functionalized, water-dispersible SWNHs material are versatile precursors that have potential applications in the biomedical area.

Shu, Chunying [Virginia Polytechnic Institute and State University (Virginia Tech); Zhang, Jianfei [Virginia Polytechnic Institute and State University (Virginia Tech); Sim, Jae Hyun [Virginia Polytechnic Institute and State University (Virginia Tech); Burke, Brian [University of Virginia, Charlottesville; Williams, Keith A [University of Virginia, Charlottesville; Rylander, Nichole M [Virginia Polytechnic Institute and State University (Virginia Tech); Campbell, Tom [Virginia Polytechnic Institute and State University (Virginia Tech); Puretzky, Alexander A [ORNL; Rouleau, Christopher M [ORNL; Geohegan, David B [ORNL; More, Karren Leslie [ORNL; Esker, Alan R [Virginia Polytechnic Institute and State University (Virginia Tech); Gibson, Harry W [Virginia Polytechnic Institute and State University (Virginia Tech); Dorn, Harry C [Virginia Polytechnic Institute and State University (Virginia Tech)

2010-01-01T23:59:59.000Z

412

A general numerical solution of dispersion relations for the nuclear optical model  

E-Print Network (OSTI)

A general numerical solution of the dispersion integral relation between the real and the imaginary parts of the nuclear optical potential is presented. Fast convergence is achieved by means of the Gauss-Legendre integration method, which offers accuracy, easiness of implementation and generality for dispersive optical model calculations. The use of this numerical integration method in the optical-model parameter search codes allows for a fast and accurate dispersive analysis. PACS number(s): 11.55.Fv, 24.10.Ht, 02.60.Jh

Roberto Capote; Alberto Molina; Jose Manuel Quesada

2001-05-09T23:59:59.000Z

413

Managing mobile species with MPAs: the effects of mobility, larval dispersal, and fishing mortality on closure size  

E-Print Network (OSTI)

Managing mobile species with MPAs: the effects of mobility, larval dispersal, and fishing mortality. Managing mobile species with MPAs: the effects of mobility, larval dispersal, and fishing mortality to understand the interaction between larval dispersal, adult mobility, and fishing mortality. In this paper

Codling, Edward A.

414

GIS-Based Hazardous Gas Dispersion, Simulations and Analysis Debasis Karmakar, Samit Ray Chaudhuri and Eduardo Jose Maguino  

E-Print Network (OSTI)

GIS-Based Hazardous Gas Dispersion, Simulations and Analysis Debasis Karmakar, Samit Ray Chaudhuri methodology to be developed for hazardous gas dispersion connecting Disaster Simulation and Trace with GIS of Gas Dispersion Affected Area Overlaid on Satellite Image (using ArcGIS 9.2) Scenario-based Simulation

Shinozuka, Masanobu

415

Direct coal liquefaction at HTI using dispersed slurry catalyst  

SciTech Connect

The US Department of Energy (DOE) Direct Coal Liquefaction effort, in which Hydrocarbon Technologies, Inc. (HTI) is a major participant, is an integral part of the effort to meet the US National Energy Strategy goal of relying more on indigenous sources of energy. This is also very applicable to the China situation where there is a need to use the abundant coal, and organic waste resources present in China to produce cost-effective fuels that will meet environmental goals of high efficiency with neutral consequences on air, water and ground status. Located at HTI`s Research and Development Center in Lawrenceville, New Jersey are several pilot scale continuous flow operating units to study, develop and demonstrate direct coal liquefaction and hydrocracking. These units include two two-stage, 50 Kg/day process evaluation units, one 3/4 ton/day process confirmation unit and a 5 ton/day process development unit. Each of these units are adaptable for operation as fluidized (ebullated) beds or fully backmixed slurry catalyst reactor units. These units are completely integrated to provide feed preparation and handling, preheating, reaction, vapor/liquid separation, on-line hydrotreating, product fractionation, bottoms recycling and solid removal. These units have not only been used in the processing of coal, but also in the upgrading of heavy oil, tar sand bitumen, shale oil, waste tires, plastics, lignin and other organic municipal and industrial wastes. HTI has developed an advanced direct liquefaction process, HTI Coal Process, that produces clean transportation fuels and chemicals at a US cost of less than $30/bbl., equivalent crude oil price, at a grass roots facility. This process is based on the use of an HTI iron based catalyst, GelCat, with backmixed reactors, a close-coupled hydrotreater and interstage gas/liquid separation. Coal conversion, distillate yields and product qualities are comparable to that seen with a supported catalyst reactor system. The process is continuous, isothermal and free of solids accumulation with all coal ranks tested. Under the auspices of the US DOE, HTI has developed multi-stage liquefaction processes based on both supported and dispersed catalysts. The supported catalyst configuration involves the use of a three-phase ebullated bed reactor in which the supported catalyst is maintained at a random (fluidization) stage by re-circulating a relatively large quantity of catalyst-gas-free process fluid collected from the top of the reactor.

Lee, L.K.; Comolli, A.G.; Popper, G.; Zhou, P.Z. [Hydrocarbon Technologies, Inc., Lawrenceville, NJ (United States)

1997-12-31T23:59:59.000Z

416

Thermal Ion Dispersion At Lightning Dock Area (Cunniff & Bowers, 2005) |  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Thermal Ion Dispersion At Lightning Dock Area (Cunniff & Bowers, 2005) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Thermal Ion Dispersion At Lightning Dock Area (Cunniff & Bowers, 2005) Exploration Activity Details Location Lightning Dock Area Exploration Technique Thermal Ion Dispersion Activity Date Usefulness useful DOE-funding Unknown Notes Thermal Ion Dispersion (TID) is a method used by the precious-metals industry to determine the movement of hot, mineral-bearing waters through rocks, gravels, and soils. The survey involves collection of soil samples

417

Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling  

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

Review of the ENSR Report Titled "Update 1 to: A Dispersion Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" Docket No. EO-05-01. Sullivan Environmental Consulting, Inc. has prepared a review of the "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" written by ENSR Corporation on behalf of the Mirant Potomac River Power Plant. This report models only Unit #1 operating under two daytime only scenarios to reduce exposures and meet the National Ambient Air Quality Standards for PM10, SO2, and NOx that were not met using normal operating procedures.

418

Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

Update 1 to: A Dispersion Modeling Analysis of Downwash from Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions in a Cycling Mode Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions in a Cycling Mode Docket No. EO-05-01. This report describes dispersion modeling performed for Unit 1 at Mirant's Potomac River Generating Station. The modeling was performed according to the Protocol approved by the Virginia Department of Environmental Quality. The purpose of the modeling was to demonstrate that Unit 1 operating alone under specific loads and during certain periods in a calendar day will not cause or contribute to exceedances of the National Ambient Air Quality Standards (NAAQS).

419

Update 6 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

6 to: A Dispersion Modeling Analysis of Downwash from 6 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant Modeling Baseload Units 3,4,5 Update 6 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant Modeling Baseload Units 3,4,5 Docket No. EO-05-01: This report describes dispersion modeling performed for simultaneous operation of three baseload units at Mirant's Potomac River Generating Station (PRGS). The units (3,4,5) would operate at maximum load (107 MW) for up to 12 hours and minimum load (35 MW) 12 hours or more in a calendar day. This mode of operation is also referred to as Option B in Mirant Potomac River LLC's December 30, 2005 letter to the U.S. Department of Energy regarding District of Columbia Public Service Commission, Docket No. EO-05-01. The modeling was performed according to

420

Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling  

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

Review of the ENSR Report Titled "Update 1 to: A Dispersion Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" Review of the ENSR Report Titled "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" Docket No. EO-05-01. Sullivan Environmental Consulting, Inc. has prepared a review of the "Update 1 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant" written by ENSR Corporation on behalf of the Mirant Potomac River Power Plant. This report models only Unit #1 operating under two daytime only scenarios to reduce exposures and meet the National Ambient Air Quality Standards for PM10, SO2, and NOx that were not met using normal operating procedures.

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


421

Back-calculating emission rates for ammonia and particulate matter from area sources using dispersion modeling  

E-Print Network (OSTI)

Engineering directly impacts current and future regulatory policy decisions. The foundation of air pollution control and air pollution dispersion modeling lies in the math, chemistry, and physics of the environment. Therefore, regulatory decision...

Price, Jacqueline Elaine

2004-11-15T23:59:59.000Z

422

Air dispersion modeling of particulate matter from ground-level area sources  

E-Print Network (OSTI)

permit when, in fact, its emissions result in off-property concentrations that would not cause a violation of the National Ambient Air Quality Standard (NAAQS) for PM. To ensure fair and reliable regulation of pollutant sources, dispersion models...

Meister, Michael Todd

2012-06-07T23:59:59.000Z

423

Laboratory investigation of lateral dispersion within dense arrays of randomly distributed cylinders at transitional Reynolds number  

E-Print Network (OSTI)

Relative (effective) lateral dispersion of a passive solute was examined at transitional Reynolds numbers within a two-dimensional array of randomly distributed circular cylinders of uniform diameter d. The present work ...

Nepf, Heidi

424

Large Eddy Simulation of the Wind Field and Pollution Dispersion in Building Array  

Science Journals Connector (OSTI)

The air quality is one of the significant issues in sustainable development of modern city. In the paperthe Large Eddy Simulation (LES) is used to predict the wind field and pollution dispersion in residence dist...

R. F. Shi; G. X. Cui; C. X. Xu; Z. S. Zhang

2009-01-01T23:59:59.000Z

425

Boussinesq-type formulations for fully nonlinear and extremely dispersive water waves: derivation and analysis  

Science Journals Connector (OSTI)

...research-article Research Article Boussinesq-type formulations for fully nonlinear...Agern Alle 11, 2970 Horsholm, Denmark Boussinesq formulations valid for highly dispersive...operators are replaced by finite-series (Boussinesq-type) approximations. Three different...

2003-01-01T23:59:59.000Z

426

Dispersion of swimming algae in laminar and turbulent channel flows: consequences for photobioreactors  

Science Journals Connector (OSTI)

...24 30 18 Dispersion of swimming algae in laminar and turbulent channel...affects the transport of swimming algae in suspension. For example, viscous...SA Scott, and AG Smith. 2010 Biodiesel from algae: challenges and prospects. Energy...

2013-01-01T23:59:59.000Z

427

Sensors and Actuators B 106 (2005) 122127 Eulerian-Lagrangian model for predicting odor dispersion using  

E-Print Network (OSTI)

mills. This paper de- scribes a paradigm for predicting the trajectory of odorous emissions from a CAFO: sss@acpub.duke.edu (S.S. Schiffman). long-distance dispersal of seeds by wind [1]. It is based

Katul, Gabriel

428

A comparative study of dispersion techniques for nanocomposite made with nanoclays and an unsaturated polyester resin  

Science Journals Connector (OSTI)

Over the last few years, polymer/clay nanocomposites have been an area of intensive research due to their capacity to improve the properties of the polymer resin. These nanocharged polymers exhibit a complex rheological behavior due to their dispersed ...

Farida Bensadoun; Nadir Kchit; Catherine Billotte; Franois Trochu; Edu Ruiz

2011-01-01T23:59:59.000Z

429

Phase Transitions in Cellulose Microfibril Dispersions by High-Energy Mechanical Deagglomeration  

Science Journals Connector (OSTI)

Phase Transitions in Cellulose Microfibril Dispersions by High-Energy Mechanical Deagglomeration ... This is achieved by applying high-energy mechanical deagglomeration to bacterial cellulose (BC) networks in the presence of sodium carboxymethyl cellulose (CMC). ...

Sandra J. Veen; Anke Kuijk; Peter Versluis; Henk Husken; Krassimir P. Velikov

2014-10-14T23:59:59.000Z

430

Occupation, Dispersal, and Economic Impact of Major Invasive Plant Species in Southern U.S. Forests  

E-Print Network (OSTI)

Invasive alien plants have impacted southern U.S. forests. This study focuses on quantifying current distribution, rate of dispersals, and economic losses caused by four major invaders Chinese tallow (Triadica sebifera (L.) Small), Chinese Privet...

Wang, Hsiao-Hsuan

2011-02-22T23:59:59.000Z

431

Kaon dispersion relation and flow in relativistic heavy-ion collisions  

E-Print Network (OSTI)

Within the framework of a relativistic transport model (ART) for heavy-ion collisions at AGS energies, we examine the effects of a kaon dispersion relation on the transverse flow of kaons and their transverse momentum and azimuthal angle...

Li, Ba; Ko, Che Ming.

1996-01-01T23:59:59.000Z

432

Isotope 87Rb Faraday anomalous dispersion optical filter at 420??nm  

Science Journals Connector (OSTI)

We demonstrate a Faraday anomalous dispersion optical filter (FADOF) operating on 5S1/26P3/2 transition at 420nm with a 5cm long cell of 96.5%...

Ling, Li; Bi, Gang

2014-01-01T23:59:59.000Z

433

A NEW TUNNEL RISK ASSESSMENT PROCEDURE INTEGRATING SMOKE DISPERSION AND EVACUATION MODELS  

E-Print Network (OSTI)

dispersion, Evacuation, Computer model, Tenability, HVAC INTRODUCTION Because tunnels are complex Systems on harmonisation of minimum safety standards to guarantee a high level of safety for thé users of tunnels

Boyer, Edmond

434

A Quantitative study of polymeric dispersant adsorption onto oxide-coated titania pigments  

Science Journals Connector (OSTI)

Polyacrylic acid salts and similar copolymers are used extensively in the coatings industry to disperse oxide-coated titania pigments. The effect of polymer adsorption onto the pigment can vary widely depending on polymer composition, pigment surface treatment, and solution properties such as pH and ionic strength. This investigation examines the effect of molecular weight on the adsorbed layer thickness and stabilizing action of polyacrylic acid dispersants. In order to understand the stabilization mechanism, a DLVO model was used in which the surface treatment layer of the pigment and the adsorbed layer thickness of the dispersant were taken into account. It was found that only this level of detail could account for the degree of stability found in pigment suspensions. Layer thickness and adsorption isotherms indicate that the dispersant molecules do not adsorb completely flat to the pigment surface but with enough loops and tails to provide some electrosteric stabilization.

Mark A Banash; Stuart G Croll

1999-01-01T23:59:59.000Z

435

THE DISPERSIVE EFFECT OF SODIUM HEXAMETAPHOSPHATE ON KAOLINITE IN SALINE WATER  

Science Journals Connector (OSTI)

...adsorption sites for the dispersant, because the zeta potentials...Thermodynamics of boric acid in synthetic seawater...low-molecular-weight polyacrylic acid on the coagulation of...dissociation of boric acid in seawater at S=35...

Mark Ma

436

E-Print Network 3.0 - amplified dispersive fourier-transform...  

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

fourier-transform Search Powered by Explorit Topic List Advanced Search Sample search results for: amplified dispersive fourier-transform Page: << < 1 2 3 4 5 > >> 1 Pulse energy...

437

Nonreciprocal dispersion of spin waves in ferromagnetic thin films covered with a finite-conductivity metal  

SciTech Connect

We study the effect of one-side metallization of a uniform ferromagnetic thin film on its spin-wave dispersion relation in the DamonEshbach geometry. Due to the finite conductivity of the metallic cover layer on the ferromagnetic film, the spin-wave dispersion relation may be nonreciprocal only in a limited wave-vector range. We provide an approximate analytical solution for the spin-wave frequency, discuss its validity, and compare it with numerical results. The dispersion is analyzed systematically by varying the parameters of the ferromagnetic film, the metal cover layer and the value of the external magnetic field. The conclusions drawn from this analysis allow us to define a structure based on a 30?nm thick CoFeB film with an experimentally accessible nonreciprocal dispersion relation in a relatively wide wave-vector range.

Mruczkiewicz, M.; Krawczyk, M. [Faculty of Physics, Adam Mickiewicz University in Poznan, Umultowska 85, Pozna? 61-614 (Poland)

2014-03-21T23:59:59.000Z

438

Nanoclay dispersion in a miscible blend: an assessment through rheological analysis  

Science Journals Connector (OSTI)

A plethora of experimental studies on the correlation between the morphology of polymer nanocomposites and melt rheological properties can be found in the literature. The degree of dispersion has been traditional...

Mahdi Ghelichi; Nader Taheri Qazvini; Seyed Hassan Jafari

2012-03-01T23:59:59.000Z

439

Wintertime Dispersion in a Mountainous Basin at Roanoke, Virginia: Tracer Study  

Science Journals Connector (OSTI)

During January 1989, five nighttime SF6 tracer experiments were conducted in Roanoke, Virginia. The experiments were designed to help identify and understand the dispersion characteristics of a basin atmosphere during winter stagnation ...

K. Jerry Allwine; Brian K. Lamb; Robert Eskridge

1992-11-01T23:59:59.000Z

440

Dispersal of phytoplanktotrophic shipworm larvae (Bivalvia: Teredinidae) over long distances by ocean currents  

Science Journals Connector (OSTI)

Shipworms or Teredinidae may be dispersed either as adults in floating wooden objects or as pelagic larvae drifting near the sea surface. Five shipworm species, i.e., half of those having an amphi-Atlantic geogra...

R. S. Scheltema

1971-10-01T23:59:59.000Z

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


441

Generic Approach for Dispersing Single-Walled Carbon Nanotubes:? The Strength of a Weak Interaction  

Science Journals Connector (OSTI)

A generic noncovalent approach for dispersing high concentrations of individual single-walled carbon nanotubes (SWNT) in organic as well as aqueous solutions of synthetic block copolymers is presented. It is suggested that a weak, long-ranged entropic ...

Rina Shvartzman-Cohen; Yael Levi-Kalisman; Einat Nativ-Roth; Rachel Yerushalmi-Rozen

2004-06-24T23:59:59.000Z

442

Frugivores and seed dispersal: mechanisms and consequences for biodiversity of a key ecological interaction  

Science Journals Connector (OSTI)

...interaction networks) and conservation biology (effects of...plants and frugivores. conservation biology|dispersal...dynamics [2]. Wind, water, gravity and a host...and restricted species pool of animal frugivores...including eco-physiology, conservation biology, climate change...

2011-01-01T23:59:59.000Z

443

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

E-Print Network (OSTI)

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

Ted Jacobson; David Mattingly

2000-09-11T23:59:59.000Z

444

Method And Apparatus For Reducing Sample Dispersion In Turns And Junctions Of Micro-Channel Systems  

DOE Patents (OSTI)

What is disclosed pertains to improvement in the performance of microchannel devices by providing turns, wyes, tees, and other junctions that produce little dispersion of a sample as it traverses the turn or junction. The reduced dispersion results from contraction and expansion regions that reduce the cross-sectional area over some portion of the turn or junction. By carefully designing the geometries of these regions, sample dispersion in turns and junctions is reduced to levels comparable to the effects of ordinary diffusion. The low dispersion features are particularly suited for microfluidic devices and systems using either electromotive force, pressure, or combinations thereof as the principle of fluid transport. Such microfluidic devices and systems are useful for separation of components, sample transport, reaction, mixing, dilution or synthesis, or combinations thereof.

Griffiths, Stewart K. (Danville, CA), Nilson, Robert H. (Cardiff-by-the-Sea, CA)

2004-05-11T23:59:59.000Z

445

Monolayer cuprous chloride dispersed on pillared clays for olefin-paraffin separations by ?-complexation  

Science Journals Connector (OSTI)

New adsorbents containing cuprous chloride dispersed on pillared interlayered clays (PILC) have been prepared and studied for olefin-paraffin separations. High surface-area PILC's were synthesized with different ...

Linda S. Cheng; Ralph T. Yang

1995-01-01T23:59:59.000Z

446

FRICTION AND WEAR STUDY OF DISPERSED PHASE INTERMETALLIC COMPOUNDS IN FERROUS MATRICES  

E-Print Network (OSTI)

rights. .j . J LBL-5771 FRICTION AND WEAR STUDY OF DISPERSEDS. THESIS) i LBL-5771 FRICTION AND WEAR STUDY OF DISPERSEDWilman, "A Theory of Friction and Wear During the Abrasion

Riddle, R.A.

2010-01-01T23:59:59.000Z

447

Direct Modulation of Quantum Cascade Lasers for Chirped Laser Dispersion Spectroscopy  

Science Journals Connector (OSTI)

This paper provides an analysis of direct modulation of a quantum cascade laser for applications in chirped laser dispersion spectroscopy (CLaDS). The developed laser model is used to...

Hangauer, Andreas; Spinner, Georg; Nikodem, Michal; Wysocki, Gerard

448

Efficient localization in a dispersive waveguide : applications in terrestrial continental shelves and on Europa  

E-Print Network (OSTI)

Methods are developed for passive source localization and environmental parameter estimation in seismo-acoustic waveguides by exploiting the dispersive behavior of guided wave propagation. The methods developed are applied ...

Lee, Sunwoong

2006-01-01T23:59:59.000Z

449

VLES Study of Flow and Dispersion Patterns in Heterogeneous Urban Areas  

E-Print Network (OSTI)

. I. Introduction The threat of an intentional or non-intentional chemical/biological/nuclear (CBN, traffic) and the thermal forces (i.e. surface heating, HVAC systems) that control dispersion at this scale

Löhner, Rainald

450

Silica-nanoparticle-dispersed methacrylate photopolymers with net diffraction efficiency near 100%  

Science Journals Connector (OSTI)

We demonstrate volume holographic recording in silica-nanoparticle-dispersed methacrylate photopolymers with reduced scattering loss as low as 2%. This is made possible by use of 13-nm...

Suzuki, Naoaki; Tomita, Yasuo

2004-01-01T23:59:59.000Z

451

Comparisons of Transport and Dispersion Model Predictions of the URBAN 2000 Field Experiment  

Science Journals Connector (OSTI)

The tracer releases of the URBAN 2000 urban tracer and meteorological field experiment conducted in Salt Lake City, Utah, in October 2000 provided a wealth of data for comparison with the predictions of transport and dispersion models. ...

Steve Warner; Nathan Platt; James F. Heagy

2004-06-01T23:59:59.000Z

452

Thermal non-equilibrium in dispersed flow film boiling in a vertical tube  

E-Print Network (OSTI)

The departure from thermal equilibrium between a dispersed liquid phase and its vapor at high quality during film boiling is investigated, The departure from equilibruim is manifested by the high resistance to heat transfer ...

Forslund, Robert Paul

1966-01-01T23:59:59.000Z

453

Nonlocal homogenization theory in metamaterials: effective electromagnetic spatial dispersion and artificial chirality  

E-Print Network (OSTI)

We develop, from first principles, a general and compact formalism for predicting the electromagnetic response of a metamaterial with non-magnetic inclusions in the long wavelength limit, including spatial dispersion up to the second order. Specifically, by resorting to a suitable multiscale technique, we show that medium effective permittivity tensor and the first and second order tensors describing spatial dispersion can be evaluated by averaging suitable spatially rapidly-varying fields each satysifing electrostatic-like equations within the metamaterial unit cell. For metamaterials with negligible second-order spatial dispersion, we exploit the equivalence of first-order spatial dispersion and reciprocal bianisotropic electromagnetic response to deduce a simple expression for the metamaterial chirality tensor. Such an expression allows us to systematically analyze the effect of the composite spatial symmetry properties on electromagnetic chirality. We find that even if a metamaterial is geometrically achi...

Ciattoni, Alessandro

2015-01-01T23:59:59.000Z

454

Parameter Identification for a Dispersive Dielectric in 2D Electromagnetics: Forward and Inverse  

E-Print Network (OSTI)

Parameter Identification for a Dispersive Dielectric in 2D Electromagnetics: Forward and Inverse with a Debye dielectric slab and PML absorbing boundaries. This system assumes that the electric #12;Parameter

455

Price dispersion in the airline industry: the effect of industry elasticity and cross-price elasticity  

E-Print Network (OSTI)

This dissertation analyzes the sources of price dispersion due to the price discrimination in the U.S. airline industry. Using the multi-stage budgeting approach with the almost ideal demand system (AIDS) specification, we estimate demand for air...

Kim, Jong Ho

2009-06-02T23:59:59.000Z

456

Estimating the exposure to first receivers from a contaminated victim of a radiological dispersal device detonation  

E-Print Network (OSTI)

The threat of a Radiological Dispersal Device (RDD) detonation arouses the concern of contaminated victims of all ages. The purpose of this study was to investigate the dose to a uniformly contaminated five-year old male. It also explores...

Phillips, Holly Anne

2009-05-15T23:59:59.000Z

457

3D Weak-Dispersion Reverse-Time Migration with a StereoModeling Method  

E-Print Network (OSTI)

The finite difference method has been widely used in seismic modeling and reverse time migration. However, it generally has two issues: large computational cost and numerical dispersion. Recently, a nearly-analytic discrete ...

Li, Jingshuang

2013-01-01T23:59:59.000Z

458

Liquefied Natural Gas (LNG) Vapor Dispersion Modeling with Computational Fluid Dynamics Codes  

E-Print Network (OSTI)

Federal regulation 49 CFR 193 and standard NFPA 59A require the use of validated consequence models to determine the vapor cloud dispersion exclusion zones for accidental liquefied natural gas (LNG) releases. For modeling purposes, the physical...

Qi, Ruifeng

2012-10-19T23:59:59.000Z

459

Microstructure-Based Computational Modeling of TRIP Steels with Dispersed Particles  

E-Print Network (OSTI)

in this study. The ideas surrounding the behavior of transformation induced plasticity (TRIP) steels and particle reinforced composites are combined and investigated. A finite element model (FEM) is created to investigate the effects of dispersed ceramic...

Diaz, Sara Cristina

2012-10-19T23:59:59.000Z

460

Theory of acoustic attenuation, dispersion, and pulse propagation in unconsolidated granular materials including  

E-Print Network (OSTI)

Theory of acoustic attenuation, dispersion, and pulse propagation in unconsolidated granular of particles in contact with a new, rough-surface, random-packing model of mineral grains in unconsolidated

Buckingham, Michael

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


461

E-Print Network 3.0 - atmospheric dispersion calculations Sample...  

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

model calculations have not already been carried out... NKS-158 ISBN 978-87-7893-223-5 Nuclear risk from atmospheric dispersion in Northern Europe Bent... data coupled to an...

462

Simulation Of Emission Dispersion As The Method Of Air Quality Management  

Science Journals Connector (OSTI)

The article overlooks the mathematical simulation of air pollutants dis persion in the ambient atmosphere. A short analysis of the necessity for atmospheric dispersion modeling is presented and the influence o...

Z. Comarova; S. Mangul

2008-01-01T23:59:59.000Z

463

E-Print Network 3.0 - air pollutant dispersion Sample Search...  

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

Search Sample search results for: air pollutant dispersion Page: << < 1 2 3 4 5 > >> 1 Air Pollution Physics and Chemistry EAS 6790 Monday, Wednesday, Friday 2:05 to 2:55...

464

Flow Intermittency, Dispersion, and Correlated Continuous Time Random Walks in Porous Media  

E-Print Network (OSTI)

We study the intermittency of fluid velocities in porous media and its relation to anomalous dispersion. Lagrangian velocities measured at equidistant points along streamlines are shown to form a spatial Markov process. ...

de Anna, Pietro

465

Field and laboratory observations of small-scale dispersion in wetlands  

E-Print Network (OSTI)

Estimating longitudinal dispersion in wetlands is a necessary first step in predicting the behavior of dissolved species and suspended particles. However, many processes are involved, and they can interact in nonlinear ...

Lightbody, Anne F. (Anne Fraser), 1977-

2004-01-01T23:59:59.000Z

466

Nest distribution varies with dispersal method and familiarity-mediated aggression for two sympatric ants  

E-Print Network (OSTI)

Nest distribution varies with dispersal method and familiarity-mediated aggression for two foraging effort, nest spatial distribution and aggression of two sympatric ant species that differ similar foraging strategies, they differ in nest distribution and aggressive behaviour. The spatial

Alvarez, Nadir

467

Update 5 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

5 to: A Dispersion Modeling Analysis of Downwash from 5 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant: Modeling Cycling Units 1, 2 plus One Baseload Unit Update 5 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant: Modeling Cycling Units 1, 2 plus One Baseload Unit Docket No. EO-05-01: This report describes dispersion modeling performed for simultaneous operation of one baseload unit and two cycling units at Mirant's Potomac River Generating Station (PRGS). This mode of operation is also referred to as Option A in Mirant Potomac River LLC's December 30, 2005 letter to the U.S. Department of Energy regarding District of Columbia Public Service Commission, Docket No. EO-05- 01. The modeling was performed according to the Protocol approved by the Virginia Department of

468

Angular Dispersion-type Nonscanning Fabry-Perot Interferometer Applied to Ethanol-water Mixture  

Science Journals Connector (OSTI)

The angular dispersion-type non-scanning Fabry-Perot was applied to an ethanol-water mixture in order to investigate its acoustic properties such as the sound velocity and the...

Ko, Jae-Hyeon; Kojima, Seiji

2009-01-01T23:59:59.000Z

469

Deep-sea bacteria enriched by oil and dispersant from the Deepwater Horizon spill  

E-Print Network (OSTI)

Deep-sea bacteria enriched by oil and dispersant from the510- Running title: Enrichment of oil degraders from Gulf ofThe Deepwater Horizon oil spill resulted in a massive influx

Baelum, J.

2014-01-01T23:59:59.000Z

470

E-Print Network 3.0 - animal-mediated seed dispersal Sample Search...  

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

Summary: . In this condition, the pri- mary dispersal unit is not a seed, but a fruit (Fenner 1985, Bewley and Black 1994... of the seed embryo is usually delayed while the seed...

471

Qualification of New, Commercial Oxide Dispersion-Strengthened Alloys for Use in Advanced Fossil Processes  

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

Qualification of New, Commercial Oxide Qualification of New, Commercial Oxide Dispersion-Strengthened Alloys for Use in Advanced Fossil Processes Background Advanced higher-efficiency power generation plants would typically operate at higher temperatures and pressures than existing fleet, and would require materials that can withstand operations at these higher temperatures and pressures. Special ferritic alloys of iron called oxide dispersion-strengthened (ODS) steel have the

472

Graphene Oxides Dispersing and Hosting Graphene Sheets for Unique Nanocomposite Materials  

Science Journals Connector (OSTI)

Graphene Oxides Dispersing and Hosting Graphene Sheets for Unique Nanocomposite Materials ... Graphene oxides (GOs), beyond their widely reported use as precursors for single-layer graphene sheets, are in fact excellent materials themselves (polymers in two-dimension, polyelectrolyte-like, aqueous solubility and biocompatibility, etc.). ... In this reported work we used aqueous GOs to effectively disperse few-layer graphene sheets (GNs) in suspension for facile wet-processing into nanocomposites of GNs embedded in GOs (as the polymeric matrix). ...

Leilei Tian; Parambath Anilkumar; Li Cao; Chang Yi Kong; Mohammed J. Meziani; Haijun Qian; L. Monica Veca; Tim J. Thorne; Kenneth N. Tackett; II; Travis Edwards; Ya-Ping Sun

2011-03-16T23:59:59.000Z

473

Structure and properties of a rapidly solidified dispersion strengthened aluminum-iron-vanadium-silicon alloy  

E-Print Network (OSTI)

STRUCTURE AND PROPERTIES OF A RAPIDLY SOLIDIFIED DISPERSION STRENGTHENED ALUMINUM-IRON-VANADIUM-SILICON ALLOY A Thesis by STAFFORD DEAN LITTLE 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 1991 Major Subject: Mechanical Engineering STRUCTURE AND PROPERTIES OF A RAPIDLY SOLIDIFIED DISPERSION STRENGTHENED ALUMINUM-IRON-VANADIUM-SILICON ALLOY A Thesis by STAFFORD DEAN LITTLE Approved...

Little, Stafford Dean

2012-06-07T23:59:59.000Z

474

Effect of support on catalytic behavior of dispersed rhodium for hydrocarbon hydrogenolyses  

E-Print Network (OSTI)

EFFFCT OF SUPPORT ON CATALYTIC BEHAVIOR OF DISPERSED RHODIUM POR HYDROCARBON HYDROGENOLYSES A Thesis AMINA ARMED KHAL'lFA Submi I ted to the Graduate College of Texas AKM University in partial full illment of the requirement for the degree... of MASTER OF SCIENCE December 1986 Major Subject: Chemistry EFFECT OF SUPPORT ON CATALYTIC BEHAVIOR OF DISPERSED RHODIUM FOR HYDROCARBON HYDROGENOLYSES A Thesis by AMINA AHMED KHALIFA Approved as to style and content by: M. P. osynek (Chairman...

Khalifa, Amina Ahmed

2012-06-07T23:59:59.000Z

475

Origin of Scale-Dependent Dispersivity and Its Implications For Miscible Gas Flooding  

SciTech Connect

Dispersive mixing has an important impact on the effectiveness of miscible floods. Simulations routinely assume Fickian dispersion, yet it is well established that dispersivity depends on the scale of measurement. This is one of the main reasons that a satisfactory method for design of field-scale miscible displacement processes is still not available. The main objective of this project was to improve the understanding of the fundamental mechanisms of dispersion and mixing, particularly at the pore scale. To this end, microsensors were developed and used in the laboratory to measure directly the solute concentrations at the scale of individual pores; the origin of hydrodynamic dispersion was evaluated from first principles of laminar flow and diffusion at the grain scale in simple but geometrically completely defined porous media; techniques to use flow reversal to distinguish the contribution to dispersion of convective spreading from that of true mixing; and the field scale impact of permeability heterogeneity on hydrodynamic dispersion was evaluated numerically. This project solved a long-standing problem in solute transport in porous media by quantifying the physical basis for the scaling of dispersion coefficient with the 1.2 power of flow velocity. The researchers also demonstrated that flow reversal uniquely enables a crucial separation of irreversible and reversible contributions to mixing. The interpretation of laboratory and field experiments that include flow reversal provides important insight. Other advances include the miniaturization of long-lasting microprobes for in-situ, pore-scale measurement of tracers, and a scheme to account properly in a reservoir simulator (grid-block scale) for the contributions of convective spreading due to reservoir heterogeneity and of mixing.

Steven Bryant; Russ Johns; Larry Lake; Thomas Harmon

2008-09-30T23:59:59.000Z

476

Age analysis and dispersion patterns of the biotype-C greenbug on sorghum  

E-Print Network (OSTI)

AGE ANALYSIS AND DISPERSION PATTERNS OF THE DIOTYPE-C GREENBUG ON SORGHUM A Thesis Kenneth Rodney Summy Submitted to the Graduate College of Texas A%M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE... May 1978 Major Subjects Entomology AGE ANALYSIS AND DISPERSION PATTENS OF THE BIOTYPEM GREENBGG ON SORGiDM A Thesis by Kenneth Rodney Summy Approved as to style and content by& Chairman of' Conunittee ad o Department Member Member Member May...

Summy, Kenneth Rodney

2012-06-07T23:59:59.000Z

477

Effects of Acclimation on Poststocking Dispersal and Physiological Condition of Age-1 Pallid Sturgeon  

SciTech Connect

A propagation program for pallid sturgeon Scaphirhynchus albus in the upper Missouri River was implemented by the U. S. Fish and Wildlife Service in 1997. Preliminary research indicated that many hatchery-reared pallid sturgeon were experiencing significant downstream poststocking dispersal, negatively affecting their recruitment. Therefore, the objective of this study was to evaluate the effects of acclimation to flow and site-specific physicochemical water conditions on poststocking dispersal and physiological condition of age-1 pallid sturgeon. Fish from three acclimation treatments were radio-tagged, released at two locations (Missouri River and Marias River), and monitored using passive telemetry stations. Marias treatment was acclimated to flow and site-specific physicochemical conditions, Bozeman treatment was acclimated to flow only, and traditional treatment had no acclimation (reared under traditional protocol). During both years fish released in the Missouri River dispersed less than fish released in the Marias River. In 2005, Marias treatment dispersed less and nearly twice as many fish remained in the Missouri River reach than traditional treatment. In 2006, pallid sturgeon dispersed similarly among treatments and fish remaining in the Missouri River reach were similar among all treatments. Differences in poststocking dispersal between years may be related to fin curl. Fin curl was present in all fish in 2005 and 27% of the fish in 2006. Pallid sturgeon from all treatments in both years had a greater affinity for the lower reaches of the Missouri River than the upper reaches. Thus, habitat at release site influenced poststocking dispersal more than acclimation treatment. No difference was observed in relative growth rate among treatments in 2006. However, acclimation to flow (i.e., exercise conditioning) may reduce liver fat content. Acclimation conditions used in this study may not benefit pallid sturgeon unless physiological maladies are present. Further, natural resource agencies need to consider stocking location carefully to reduce poststocking dispersal.

Oldenburg, Eric W.; Guy, Christopher S.; Cureton, Eli S.; Webb, Molly H.; Gardner, William M.

2011-03-28T23:59:59.000Z

478

The backflow cell model of steady state flow reactors with axial dispersion  

E-Print Network (OSTI)

THE BACKFLOW CELL MODEL OF STEADY STATE FLOW REACTORS WITH AXIAL DISPERSION A Thesis By John Thomas Baldwin Submitted to the Graduate College of the Texas A/M University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE May 1966 Major Subject;. Chemical Engineering THE BACKFLOW CELL MODEL OF STEADY STATE FLOW REACTORS WITH AXIAL DISPERSION A Thesis By John Thomas Baldwin Approved as to style and content by: C airman o ommittee ea o epartment (Member...

Baldwin, John Thomas

2012-06-07T23:59:59.000Z

479

Heat kernel Coefficients and Divergencies of the Casimir Energy for the Dispersive Sphere  

E-Print Network (OSTI)

The first heat kernel coefficients are calculated for a dispersive ball whose permittivity at high frequency differs from unity by inverse powers of the frequency. The corresponding divergent part of the vacuum energy of the electromagnetic field is given and ultraviolet divergencies are seen to be present. Also in a model where the number of atoms is fixed the pressure exhibits infinities. As a consequence, the ground-state energy for a dispersive dielectric ball cannot be interpreted easily.

M. Bordag; K. Kirsten

2001-10-24T23:59:59.000Z

480

Bounds on Spectral Dispersion from Fermi-Detected Gamma Ray Bursts  

Science Journals Connector (OSTI)

Data from four Fermi-detected gamma-ray bursts (GRBs) are used to set limits on spectral dispersion of electromagnetic radiation across the Universe. The analysis focuses on photons recorded above 1GeV for Fermi-detected GRB 080916C, GRB 090510A, GRB 090902B, and GRB 090926A because these high-energy photons yield the tightest bounds on light dispersion. It is shown that significant photon bunches in GRB 090510A, possibly classic GRB pulses, are remarkably brief, an order of magnitude shorter in duration than any previously claimed temporal feature in this energy range. Although conceivably a>3? fluctuation, when taken at face value, these pulses lead to an order of magnitude tightening of prior limits on photon dispersion. Bound of ?c/c<6.9410-21 is thus obtained. Given generic dispersion relations where the time delay is proportional to the photon energy to the first or second power, the most stringent limits on the dispersion strengths were k1<1.6110-5??sec?Gpc-1?GeV-1 and k2<3.5710-7??sec?Gpc-1?GeV-2, respectively. Such limits constrain dispersive effects created, for example, by the spacetime foam of quantum gravity. In the context of quantum gravity, our bounds set M1c2 greater than 525 times the Planck mass, suggesting that spacetime is smooth at energies near and slightly above the Planck mass.

Robert J. Nemiroff; Ryan Connolly; Justin Holmes; Alexander B. Kostinski

2012-06-08T23:59:59.000Z

Note: This page contains sample records for the topic "dispersion manifolds perforated" from the National Library of EnergyBeta (NLEBeta).
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481

An Algorithm for Detecting Quantum-Gravity Photon Dispersion in Gamma-Ray Bursts: DISCAN  

E-Print Network (OSTI)

DisCan is a new algorithm implementing photon dispersion cancellation in order to measure energy-dependent delays in variable sources. This method finds the amount of reversed dispersion that optimally cancels any actual dispersion present. It applies to any time- and energy-tagged photon data, and can avoid binning in both time and energy. The primary motivation here is the search for quantum gravity based dispersion in future gamma ray burst data from the Gamma Ray Large Area Space Telescope (GLAST). Extrapolation of what is know about bursts at lower energies yields a reasonable prospect that photon dispersion effects consistent with some quantum gravity formalisms may be detected in sufficiently bright bursts. Short bursts have no or very small inherent lags, and are therefore better prospects than long ones, but even they suffer systematic error due to pulse asymmetry that may yield an irreducible uncertainty. We note that data at energies higher than about 0.1 TeV may not be useful for detecting dispersion in GRBs. Of several variants of the proposed algorithm, one based on Shannon information is consistently somewhat superior to all of the others we investigated.

Jeffrey D. Scargle; Jay P. Norris; Jerry T. Bonnell

2007-09-01T23:59:59.000Z

482

Impact of dispersed solar and wind systems on electric distribution planning and operation  

SciTech Connect

Small-scale dispersed solar photovoltaic and wind generation (DSW) will affect the generation, transmission, and distribution systems of an electric utility. This study examines the technical and economic impacts of dispersing DSW devices within the distribution system. Dispersed intermittent generation is included. Effects of DSW devices on capital investments, reliability, operating and maintenance costs, protection requirements, and communication and control requirements are examined. A DSW operation model is developed to help determine the dependable capacity of fluctuating solar photovoltaic and wind generation as part of the distribution planning process. Specific case studies using distribution system data and renewable resource data for Southern California Edison Company and Consumers Power Company are analyzed to gain insights into the effects of interconnecting DSW devices. The DSW devices were found to offer some distribution investment savings, depending on their availability during peak loads. For a summer-peaking utility, for example, dispersing photovoltaic systems is more likely to defer distribution capital investments than dispersing wind systems. Dispersing storage devices to increase DSW's dependable capacity for distribution systems needs is not economically attractive. Substation placement of DSW and storage devices is found to be more cost effective than feeder or customer placement. Examination of the effects of DSW on distribution system operation showed that small customer-owned DSW devices are not likely to disrupt present time-current distribution protection coordination. Present maintenance work procedures, are adequate to ensure workmen's safety. Regulating voltages within appropriate limits will become more complex with intermittent generation along the distribution feeders.

Boardman, R.W.; Patton, R.; Curtice, D.H.

1981-02-01T23:59:59.000Z

483

Street lighting delays and disrupts the dispersal of Atlantic salmon (Salmo salar) fry  

Science Journals Connector (OSTI)

There has been a decline in the abundance of Atlantic salmon (Salmo salar) despite significant conservation measures designed to reduce fishing mortality. Populations at the southern edge of their historical distribution, where anthropogenic impacts on the freshwater environment may be greater, have suffered the largest decline. In this investigation, we compared the timing of Atlantic salmon fry dispersal from incubators in an aquarium under control and ecologically relevant broad spectrum street-lit conditions (median night light intensity=12lx). Fry dispersal occurred 2.8days later (F=82.9, df=1,8, pstreet lighting. Significant disruption to the diel pattern of fry dispersal was also observed. Dispersal under control conditions was significantly directed around a mean time of 4:17h after dusk (pstreet lighting, the dispersal of fry was significantly delayed (mean time 6:38h after dusk; pstreet-lit conditions (p=0.21, n=5000eggs across 10incubators). However, in the wild, the period between fry emergence and the establishment of feeding territories is considered to be of critical importance in the dynamics of salmonid populations and any disruption may reduce fitness.

W.D. Riley; P.I. Davison; D.L. Maxwell; B. Bendall

2013-01-01T23:59:59.000Z

484

The toxicity of oil and chemically dispersed oil to the seagrass Thalassia testudinum  

SciTech Connect

Turtle grass beds, a valuable natural resource, are diminishing throughout the tropics because of damage from dredging, boats, and other factors. The toxicity of chemical dispersants and crude oil to turtle grass was determined in the laboratory to assess the potential for damage from spills occurring in the field. Studies of water-soluble fractions (WSF) of crude oil in static bioassays showed that a chemical dispersant (Corexit 9527) increased the amount of total oil in water more than 50-fold. The toxicity of chemically dispersed oil was assessed by conventional (96-h 50% lethal concentration) methods in static systems, and the results were compared with toxicity measurements where the system was flushed after 12 h. Prudhoe Bay crude WSF was more toxic than dispersed oil or dispersant alone, possibly because of the large component of benzene, toluene, and C-2 benzene. The percentage of green (chlorophyllous) leaves was useful as evidence of toxicity. The importance of anatomical features such as recessed meristem and abundant leaf sheaths in protecting the growing region from waterborne pollutants was evident.

Baca, B.J.; Getter, C.D.

1982-10-01T23:59:59.000Z

485

Update 2 to: A Dispersion Modeling Analysis of Downwash from Mirant's  

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

2 to: A Dispersion Modeling Analysis of Downwash from 2 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions at Maximum and Minimum Loads Update 2 to: A Dispersion Modeling Analysis of Downwash from Mirant's Potomac River Power Plant, Modeling Unit 1 Emissions at Maximum and Minimum Loads Docket No. EO-05-01. This report describes AERMOD modeling results performed for Unit 1 at Mirant's Potomac River Generating Station. The purpose of these runs was to demonstrate that operation of Unit 1 for 24 hours a day loads from 35MW to 88 MW with the use of trona to reduce SO2 emissions will not cause or contribute to modeled excceedences of the National Ambient Air Quality Standards (NAAQS). Mirant proposes to use trona on an as needed basis to limit SO2 emissions to less than

486

Flocculation-dispersion characteristics of alumina using a wide molecular weight range of polyacrylic acids  

Science Journals Connector (OSTI)

The effects of polymer molecular weight on the flocculation/dispersion behavior of a model colloidal system consisting of alumina and polyacrylic acid (PAA) were investigated. Low molecular weight polymers, traditionally used as dispersants were discovered to flocculate alumina at ultra low concentrations. For molecular weights ranging from 2000 to 50?000 g mol?1, distinct concentration ranges were found to exist in which the polymer behaved as a flocculant and above which it behaved as a dispersant. With increasing molecular weight, the number of polymer molecules required to achieve a benchmark flocculation (80% flocculation) decreased down to the molecular weight of 250?000 g mol?1 PAA. Above this size, there was no significant advantage of increasing the molecular weight. It was observed that regardless of the sign of the zeta potential, flocculation of alumina could be obtained with PAA suggesting that in addition to electrostatics, other forces such as bridging by hydrogen bonding are also responsible for the flocculation.

Kalyan K. Das; P. Somasundaran

2003-01-01T23:59:59.000Z

487

3D chaotic model for sub-grid turbulent dispersion in Large Eddy Simulations  

E-Print Network (OSTI)

We introduce a 3D multiscale kinematic velocity field as a model to simulate Lagrangian turbulent dispersion. The incompressible velocity field is a nonlinear deterministic function, periodic in space and time, that generates chaotic mixing of Lagrangian trajectories. Relative dispersion properties, e.g. the Richardson's law, are correctly reproduced under two basic conditions: 1) the velocity amplitudes of the spatial modes must be related to the corresponding wavelengths through the Kolmogorov scaling; 2) the problem of the lack of "sweeping effect" of the small eddies by the large eddies, common to kinematic simulations, has to be taken into account. We show that, as far as Lagrangian dispersion is concerned, our model can be successfully applied as additional sub-grid contribution for Large Eddy Simulations of the planetary boundary layer flow.

Guglielmo Lacorata; Andrea Mazzino; Umberto Rizza

2007-11-15T23:59:59.000Z

488

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

Science Journals Connector (OSTI)

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

Jun Zhu; Peiyong Ji

2012-01-01T23:59:59.000Z

489

Influence of air-filled porosity of soils on air permeability and gaseous dispersion  

E-Print Network (OSTI)

transverse dispersion to be neglected. Equation (2) can then be simplified to: ac a*c ac D ? ? v at " az' az (4) Determination of the longitudinal dispersion coefficient of a soil is based on analysis of the miscible displacement of two fluids... Z ? v, t VEZ [ezfc( ) + exp( ? ) erfc( Co 2 2 (D t)" D? Z + v, t )) (6) 2 (D?t) ' where ezfc( ) = complimentary error function of the argument in parentheses. The second term is very small in comparison to the first term and may be neglected...

McCarthy, Kevin P.

2012-06-07T23:59:59.000Z

490

Disappearance of rotational flow and reaction plane dispersions in Kr+Au collisions  

Science Journals Connector (OSTI)

Two-particle azimuthal correlations have been used to extract reaction plane dispersion free triple-differential cross sections for d, t, and ? particles for the midcentral collisions of 84Kr+197Au at E/A=35, 55, and 70 MeV. Both experimental measurements and extrapolations from lower incident energies suggest that rotational flow disappears at E/A?100 MeV for light charged particles and that reaction plane dispersions introduce large uncertainties in extracting the disappearance of rotational flow.

W. Q. Shen; M. B. Tsang; N. Carlin; R. J. Charity; J. Feng; C. K. Gelbke; W. C. Hsi; M. J. Huang; G. J. Kunde; M-C. Lemaire; M. A. Lisa; W. G. Lynch; U. Lynen; Y. G. Ma; G. F. Peaslee; L. Phair; J. Pochodzalla; H. Sann; C. Schwarz; L. G. Sobotka; R. T. de Souza; S. R. Souza; W. Trautmann; C. Williams

1998-03-01T23:59:59.000Z

491

Comparison of predictions of the Hybrid Plume Dispersion Model with observations at the Kincaid power plant  

Science Journals Connector (OSTI)

The Hybrid Plume Dispersion Model (HPDM) has been evaluated with observations from a field experiment at the Kincaid power plant. HPDM is a dispersion model for buoyant plumes that employs parameterisations of boundary-layer wind, temperature, and turbulence profiles and Lagrangian time-scales. The model accounts for the bimodal distribution of turbulent velocities in the convective boundary layer and contains an algorithm for calculating the lofting of a buoyant plume against a capping inversion. The model predictions of maximum plume centreline concentrations show a mean bias of less than l0%, a typical error that is about 50% of the mean, and a correlation of about 0.5.

S.R. Hanna; J.C. Chang

1995-01-01T23:59:59.000Z

492

Array of aligned and dispersed carbon nanotubes and method of producing the array  

DOE Patents (OSTI)

An array of aligned and dispersed carbon nanotubes includes an elongate drawn body including a plurality of channels extending therethrough from a first end to a second end of the body, where the channels have a number density of at least about 100,000 channels/mm.sup.2 over a transverse cross-section of the body. A plurality of carbon nanotubes are disposed in each channel, and the carbon nanotubes are sufficiently dispersed and aligned along a length of the channels for the array to comprise an average resistivity per channel of about 9700 .OMEGA.m or less.

Ivanov, Ilia N; Simpson, John T; Hendricks, Troy R

2013-06-11T23:59:59.000Z

493

Array of aligned and dispersed carbon nanotubes and method of producing the array  

DOE Patents (OSTI)

An array of aligned and dispersed carbon nanotubes includes an elongate drawn body including a plurality of channels extending therethrough from a first end to a second end of the body, where the channels have a number density of at least about 100,000 channels/mm.sup.2 over a transverse cross-section of the body. A plurality of carbon nanotubes are disposed in each channel, and the carbon nanotubes are sufficiently dispersed and aligned along a length of the channels for the array to comprise an average resistivity per channel of about 9700 .OMEGA.m or less.

Ivanov, Ilia N. (Knoxville, TN); Simpson, John T. (Clinton, TN); Hendricks, Troy R. (Knoxville, TN)

2012-06-19T23:59:59.000Z

494

Integral method for the calculation of Hawking radiation in dispersive media II. Asymmetric asymptotics  

E-Print Network (OSTI)

Analogue gravity experiments make feasible the realisation of black hole spacetimes in a laboratory setting and the observational verification of Hawking radiation. Since such analogue systems are typically dominated by dispersion, efficient techniques for calculating the predicted Hawking spectrum in the presence of strong dispersion are required. In the preceding paper, an integral method in Fourier space is proposed for stationary $1+1$-dimensional backgrounds which are asymptotically symmetric. Here, this method is generalised to backgrounds which are different in the asymptotic regions to the left and right of the scattering region.

Scott Robertson

2014-03-27T23:59:59.000Z

495

Miscibilitydispersion, Interfacial Strength and Nanoclay Mobility Relationships in Polymer Nanocomposites  

SciTech Connect

Fully dispersed layered silicate nanoparticles (nanoclay) in a polymer matrix have provided a new class of multi-functional materials exhibiting several performance improvements over conventional composites. Yet the challenges of miscibility and interfacial strength might prevent nanocomposites from realizing their full potential. In this paper we demonstrate the effect of the chemical characteristics of the nanoclay on the miscibility and dispersion in the polymer matrix as well as on the interfacial strength of the bound polymer and the nanoclay mobility, all of which determine the macroscopic properties of the nanocomposite.

Carretero-Gonzlez, J.; Retsos , H; Giannelis , E; Ezquerra , T; Hernndez , M; Lpez-Manchado, M

2009-01-01T23:59:59.000Z

496

Variation of surface currents and effects on dispersion in the Tropical Pacific Ocean  

E-Print Network (OSTI)

VARIATION OF SURFACE CURRENTS AND EFFECTS ON DISPERSION IN THE TROPICAL PACIFIC OCEAN A Thesis by DOYLE JACKSON HORNE Submitted to the Graduate College of Texas A&M University in partial fulfillment of the r quirement for the degree of MASTER... '" , ~, -~WPc- (Member ) c c c . 1L. . (Hi ad o f DePar Lment) 111 ABSTRACT Variation of Surface Currents and Effects on Dispersion in the Tropical Pacific Ocean. (May 1980) Doyle Jackson Horne, B. S. , University of Illinois, Urbana Chairman...

Horne, Doyle Jackson

2012-06-07T23:59:59.000Z

497

Energy Dispersive X-ray Fluorescence Analysis of Sulfur in Biomass  

Science Journals Connector (OSTI)

An energy dispersive X-ray fluorescence (ED-XRF) spectroscopy method was developed to analyze low ppm level sulfur (S) in biomass feedstocks and in subsequent residues from pretreatment reactions. ... Representative biomass feedstocks and pretreatment residues were analyzed for S. ... The goal of this project was to determine whether an energy dispersive X-ray fluorescence (ED-XRF) spectroscopy method is effective in conducting sulfur analysis of woody biomass feedstocks at an appropriately useful sensitivity, especially when used to effectively monitor the extent of sulfur removal after biomass pretreatment reactions. ...

J. Michael Robinson; Staci R. Barrett; Kevin Nhoy; Rajesh K. Pandey; Joseph Phillips; Oscar M. Ramirez; Richard I. Rodriguez

2009-03-06T23:59:59.000Z

498

Observation of spin-wave dispersion in Nd-Fe-B magnets using neutron Brillouin scattering  

SciTech Connect

The low-energy spin-wave dispersion in polycrystalline Nd-Fe-B magnets was observed using neutron Brillouin scattering (NBS). Low-energy spin-wave excitations for the lowest acoustic spin-wave mode were clearly observed. From the spin-wave dispersion, we were able to determine the spin-wave stiffness constant D{sub sw} (100.0??4.9?meV.{sup 2}) and the exchange stiffness constant A (6.6 0.3 pJ/m)

Ono, K., E-mail: kanta.ono@kek.jp; Inami, N.; Saito, K.; Takeichi, Y.; Kawana, D.; Yokoo, T.; Itoh, S. [Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801 (Japan); Yano, M.; Shoji, T.; Manabe, A.; Kato, A. [Toyota Motor Corporation, Toyota, Aichi 471-8571 (Japan); Kaneko, Y. [Toyota Central R and D Labs. Inc., Aichi 480-1192 (Japan)

2014-05-07T23:59:59.000Z

499

Models for close-in atmospheric dispersion, explosive releases, and particle deposition  

SciTech Connect

Relatively simple models are presented to simulate close-in atmospheric dispersion, explosive releases, and particle deposition. Close-in generally refers to distances less than 50 m downwind from the source. These models assume simple gas dispersion (no chemical reactions, neutral buoyancy) and that particles behave as a gas expect they can be removed from the plume by a simple, deposition-velocity mechanism. These models have been combined into a QuickBASIC program (INEXPLC.BAS) and its PC executable form (INEXPLC.EXE). These programs, along with sample input and output files, are available from the author.

Bloom, S.G.

1993-10-06T23:59:59.000Z

500

Investigation of 2D laterally dispersive photonic crystal structures : LDRD 33602 final report.  

SciTech Connect

Artificially structured photonic lattice materials are commonly investigated for their unique ability to block and guide light. However, an exciting aspect of photonic lattices which has received relatively little attention is the extremely high refractive index dispersion within the range of frequencies capable of propagating within the photonic lattice material. In fact, it has been proposed that a negative refractive index may be realized with the correct photonic lattice configuration. This report summarizes our investigation, both numerically and experimentally, into the design and performance of such photonic lattice materials intended to optimize the dispersion of refractive index in order to realize new classes of photonic devices.

Subramania,Ganapathi Subramanian; Vawter, Gregory Allen; Wendt, Joel Robert; Peake, Gregory Merwin; Guo, Junpeng; Peters, David William; Hadley, G. Ronald

2003-12-01T23:59:59.000Z